Remove all `Result.get()`s & `Option` -> `Opt` (#902)

Co-authored-by: Ludovic Chenut <ludovic@status.im>
Co-authored-by: Diego <diego@status.im>

libp2p/builders.nim

@@ -54,7 +54,7 @@ type
     protoVersion: string
     agentVersion: string
     nameResolver: NameResolver
-    peerStoreCapacity: Option[int]
+    peerStoreCapacity: Opt[int]
     autonat: bool
     circuitRelay: Relay
     rdv: RendezVous
@@ -170,7 +170,7 @@ proc withMaxConnsPerPeer*(b: SwitchBuilder, maxConnsPerPeer: int): SwitchBuilder
   b
 
 proc withPeerStore*(b: SwitchBuilder, capacity: int): SwitchBuilder {.public.} =
-  b.peerStoreCapacity = some(capacity)
+  b.peerStoreCapacity = Opt.some(capacity)
   b
 
 proc withProtoVersion*(b: SwitchBuilder, protoVersion: string): SwitchBuilder {.public.} =
@@ -242,9 +242,9 @@ proc build*(b: SwitchBuilder): Switch
   if isNil(b.rng):
     b.rng = newRng()
 
-  let peerStore =
+  let peerStore = block:
-    if isSome(b.peerStoreCapacity):
+    b.peerStoreCapacity.withValue(capacity):
-      PeerStore.new(identify, b.peerStoreCapacity.get())
+      PeerStore.new(identify, capacity)
     else:
       PeerStore.new(identify)
 
@@ -316,7 +316,7 @@ proc newStandardSwitch*(
     .withNameResolver(nameResolver)
     .withNoise()
 
-  if privKey.isSome():
+  privKey.withValue(pkey):
-    b = b.withPrivateKey(privKey.get())
+    b = b.withPrivateKey(pkey)
 
   b.build()

libp2p/cid.nim

@@ -276,9 +276,6 @@ proc `$`*(cid: Cid): string =
     BTCBase58.encode(cid.data.buffer)
   elif cid.cidver == CIDv1:
     let res = MultiBase.encode("base58btc", cid.data.buffer)
-    if res.isOk():
+    res.get("")
-      res.get()
-    else:
-      ""
   else:
     ""

libp2p/connmanager.nim

@@ -9,7 +9,7 @@
 
 {.push raises: [].}
 
-import std/[options, tables, sequtils, sets]
+import std/[tables, sequtils, sets]
 import pkg/[chronos, chronicles, metrics]
 import peerinfo,
        peerstore,

libp2p/crypto/crypto.nim

@@ -468,7 +468,7 @@ proc init*[T: PrivateKey|PublicKey](key: var T, data: openArray[byte]): bool =
     var pb = initProtoBuffer(@data)
     let r1 = pb.getField(1, id)
     let r2 = pb.getField(2, buffer)
-    if not(r1.isOk() and r1.get() and r2.isOk() and r2.get()):
+    if not(r1.get(false) and r2.get(false)):
       false
     else:
       if cast[int8](id) notin SupportedSchemesInt or len(buffer) <= 0:
@@ -973,9 +973,8 @@ proc decodeProposal*(message: seq[byte], nonce, pubkey: var seq[byte],
   let r4 = pb.getField(4, ciphers)
   let r5 = pb.getField(5, hashes)
 
-  r1.isOk() and r1.get() and r2.isOk() and r2.get() and
+  r1.get(false) and r2.get(false) and r3.get(false) and
-  r3.isOk() and r3.get() and r4.isOk() and r4.get() and
+  r4.get(false) and r5.get(false)
-  r5.isOk() and r5.get()
 
 proc createExchange*(epubkey, signature: openArray[byte]): seq[byte] =
   ## Create SecIO exchange message using ephemeral public key ``epubkey`` and
@@ -995,7 +994,7 @@ proc decodeExchange*(message: seq[byte],
   var pb = initProtoBuffer(message)
   let r1 = pb.getField(1, pubkey)
   let r2 = pb.getField(2, signature)
-  r1.isOk() and r1.get() and r2.isOk() and r2.get()
+  r1.get(false) and r2.get(false)
 
 ## Serialization/Deserialization helpers
 

libp2p/debugutils.nim

@@ -25,7 +25,7 @@
 ##   5. LocalAddress: optional bytes
 ##   6. RemoteAddress: optional bytes
 ##   7. Message: required bytes
-import os, options
+import os
 import nimcrypto/utils, stew/endians2
 import protobuf/minprotobuf, stream/connection, protocols/secure/secure,
        multiaddress, peerid, varint, muxers/mplex/coder
@@ -33,7 +33,7 @@ import protobuf/minprotobuf, stream/connection, protocols/secure/secure,
 from times import getTime, toUnix, fromUnix, nanosecond, format, Time,
                   NanosecondRange, initTime
 from strutils import toHex, repeat
-export peerid, options, multiaddress
+export peerid, multiaddress
 
 type
   FlowDirection* = enum
@@ -43,10 +43,10 @@ type
     timestamp*: uint64
     direction*: FlowDirection
     message*: seq[byte]
-    seqID*: Option[uint64]
+    seqID*: Opt[uint64]
-    mtype*: Option[uint64]
+    mtype*: Opt[uint64]
-    local*: Option[MultiAddress]
+    local*: Opt[MultiAddress]
-    remote*: Option[MultiAddress]
+    remote*: Opt[MultiAddress]
 
 const
   libp2p_dump_dir* {.strdefine.} = "nim-libp2p"
@@ -72,7 +72,8 @@ proc dumpMessage*(conn: SecureConn, direction: FlowDirection,
   var pb = initProtoBuffer(options = {WithVarintLength})
   pb.write(2, getTimestamp())
   pb.write(4, uint64(direction))
-  pb.write(6, conn.observedAddr)
+  conn.observedAddr.withValue(oaddr):
+    pb.write(6, oaddr)
   pb.write(7, data)
   pb.finish()
 
@@ -100,7 +101,7 @@ proc dumpMessage*(conn: SecureConn, direction: FlowDirection,
   finally:
     close(handle)
 
-proc decodeDumpMessage*(data: openArray[byte]): Option[ProtoMessage] =
+proc decodeDumpMessage*(data: openArray[byte]): Opt[ProtoMessage] =
   ## Decode protobuf's message ProtoMessage from array of bytes ``data``.
   var
     pb = initProtoBuffer(data)
@@ -108,13 +109,12 @@ proc decodeDumpMessage*(data: openArray[byte]): Option[ProtoMessage] =
     ma1, ma2: MultiAddress
     pmsg: ProtoMessage
 
-  let res2 = pb.getField(2, pmsg.timestamp)
+  let
-  if res2.isErr() or not(res2.get()):
+    r2 = pb.getField(2, pmsg.timestamp)
-    return none[ProtoMessage]()
+    r4 = pb.getField(4, value)
-
+    r7 = pb.getField(7, pmsg.message)
-  let res4 = pb.getField(4, value)
+  if not r2.get(false) or not r4.get(false) or not r7.get(false):
-  if res4.isErr() or not(res4.get()):
+    return Opt.none(ProtoMessage)
-    return none[ProtoMessage]()
 
   # `case` statement could not work here with an error "selector must be of an
   # ordinal type, float or string"
@@ -124,30 +124,27 @@ proc decodeDumpMessage*(data: openArray[byte]): Option[ProtoMessage] =
     elif value == uint64(Incoming):
       Incoming
     else:
-      return none[ProtoMessage]()
+      return Opt.none(ProtoMessage)
 
-  let res7 = pb.getField(7, pmsg.message)
+  let r1 = pb.getField(1, value)
-  if res7.isErr() or not(res7.get()):
+  if r1.get(false):
-    return none[ProtoMessage]()
+    pmsg.seqID = Opt.some(value)
 
-  value = 0'u64
+  let r3 = pb.getField(3, value)
-  let res1 = pb.getField(1, value)
+  if r3.get(false):
-  if res1.isOk() and res1.get():
+    pmsg.mtype = Opt.some(value)
-    pmsg.seqID = some(value)
-  value = 0'u64
-  let res3 = pb.getField(3, value)
-  if res3.isOk() and res3.get():
-    pmsg.mtype = some(value)
-  let res5 = pb.getField(5, ma1)
-  if res5.isOk() and res5.get():
-    pmsg.local = some(ma1)
-  let res6 = pb.getField(6, ma2)
-  if res6.isOk() and res6.get():
-    pmsg.remote = some(ma2)
 
-  some(pmsg)
+  let
+    r5 = pb.getField(5, ma1)
+    r6 = pb.getField(6, ma2)
+  if r5.get(false):
+    pmsg.local = Opt.some(ma1)
+  if r6.get(false):
+    pmsg.remote = Opt.some(ma2)
 
-iterator messages*(data: seq[byte]): Option[ProtoMessage] =
+  Opt.some(pmsg)
+
+iterator messages*(data: seq[byte]): Opt[ProtoMessage] =
   ## Iterate over sequence of bytes and decode all the ``ProtoMessage``
   ## messages we found.
   var value: uint64
@@ -242,27 +239,19 @@ proc toString*(msg: ProtoMessage, dump = true): string =
       " >> "
   let address =
     block:
-      let local =
+      let local = block:
-        if msg.local.isSome():
+        msg.local.withValue(loc): "[" & $loc & "]"
-          "[" & $(msg.local.get()) & "]"
+        else: "[LOCAL]"
-        else:
+      let remote = block:
-          "[LOCAL]"
+        msg.remote.withValue(rem): "[" & $rem & "]"
-      let remote =
+        else: "[REMOTE]"
-        if msg.remote.isSome():
-          "[" & $(msg.remote.get()) & "]"
-        else:
-          "[REMOTE]"
       local & direction & remote
-  let seqid =
+  let seqid = block:
-    if msg.seqID.isSome():
+    msg.seqID.wihValue(seqid): "seqID = " & $seqid & " "
-      "seqID = " & $(msg.seqID.get()) & " "
+    else: ""
-    else:
+  let mtype = block:
-      ""
+    msg.mtype.withValue(typ): "type = " & $typ & " "
-  let mtype =
+    else: ""
-    if msg.mtype.isSome():
-      "type = " & $(msg.mtype.get()) & " "
-    else:
-      ""
   res.add(" ")
   res.add(address)
   res.add(" ")

libp2p/dialer.nim

@@ -150,7 +150,7 @@ proc dialAndUpgrade(
         if not isNil(result):
           return result
 
-proc tryReusingConnection(self: Dialer, peerId: PeerId): Future[Opt[Muxer]] {.async.} =
+proc tryReusingConnection(self: Dialer, peerId: PeerId): Opt[Muxer] =
   let muxer = self.connManager.selectMuxer(peerId)
   if muxer == nil:
     return Opt.none(Muxer)
@@ -174,10 +174,10 @@ proc internalConnect(
   try:
     await lock.acquire()
 
-    if peerId.isSome and reuseConnection:
+    if reuseConnection:
-      let muxOpt = await self.tryReusingConnection(peerId.get())
+      peerId.withValue(peerId):
-      if muxOpt.isSome:
+        self.tryReusingConnection(peerId).withValue(mux):
-        return muxOpt.get()
+          return mux
 
     let slot = self.connManager.getOutgoingSlot(forceDial)
     let muxed =
@@ -225,20 +225,20 @@ method connect*(
   allowUnknownPeerId = false): Future[PeerId] {.async.} =
   ## Connects to a peer and retrieve its PeerId
 
-  let fullAddress = parseFullAddress(address)
+  parseFullAddress(address).toOpt().withValue(fullAddress):
-  if fullAddress.isOk:
     return (await self.internalConnect(
-      Opt.some(fullAddress.get()[0]),
+      Opt.some(fullAddress[0]),
-      @[fullAddress.get()[1]],
+      @[fullAddress[1]],
-      false)).connection.peerId
-  else:
-    if allowUnknownPeerId == false:
-      raise newException(DialFailedError, "Address without PeerID and unknown peer id disabled!")
-    return (await self.internalConnect(
-      Opt.none(PeerId),
-      @[address],
       false)).connection.peerId
 
+  if allowUnknownPeerId == false:
+    raise newException(DialFailedError, "Address without PeerID and unknown peer id disabled!")
+
+  return (await self.internalConnect(
+    Opt.none(PeerId),
+    @[address],
+    false)).connection.peerId
+
 proc negotiateStream(
   self: Dialer,
   conn: Connection,

libp2p/multiaddress.nim

@@ -1080,19 +1080,15 @@ proc matchPart(pat: MaPattern, protos: seq[MultiCodec]): MaPatResult =
 proc match*(pat: MaPattern, address: MultiAddress): bool =
   ## Match full ``address`` using pattern ``pat`` and return ``true`` if
   ## ``address`` satisfies pattern.
-  let protos = address.protocols()
+  let protos = address.protocols().valueOr: return false
-  if protos.isErr():
+  let res = matchPart(pat, protos)
-    return false
-  let res = matchPart(pat, protos.get())
   res.flag and (len(res.rem) == 0)
 
 proc matchPartial*(pat: MaPattern, address: MultiAddress): bool =
   ## Match prefix part of ``address`` using pattern ``pat`` and return
   ## ``true`` if ``address`` starts with pattern.
-  let protos = address.protocols()
+  let protos = address.protocols().valueOr: return false
-  if protos.isErr():
+  let res = matchPart(pat, protos)
-    return false
-  let res = matchPart(pat, protos.get())
   res.flag
 
 proc `$`*(pat: MaPattern): string =
@@ -1121,12 +1117,8 @@ proc getField*(pb: ProtoBuffer, field: int,
   if not(res):
     ok(false)
   else:
-    let ma = MultiAddress.init(buffer)
+    value = MultiAddress.init(buffer).valueOr: return err(ProtoError.IncorrectBlob)
-    if ma.isOk():
+    ok(true)
-      value = ma.get()
-      ok(true)
-    else:
-      err(ProtoError.IncorrectBlob)
 
 proc getRepeatedField*(pb: ProtoBuffer, field: int,
                        value: var seq[MultiAddress]): ProtoResult[bool] {.
@@ -1142,11 +1134,11 @@ proc getRepeatedField*(pb: ProtoBuffer, field: int,
     ok(false)
   else:
     for item in items:
-      let ma = MultiAddress.init(item)
+      let ma = MultiAddress.init(item).valueOr:
-      if ma.isOk():
+        debug "Unsupported MultiAddress in blob", ma = item
-        value.add(ma.get())
+        continue
-      else:
+
-        debug "Not supported MultiAddress in blob", ma = item
+      value.add(ma)
     if value.len == 0:
       err(ProtoError.IncorrectBlob)
     else:

libp2p/nameresolving/nameresolver.nim

@@ -118,7 +118,7 @@ proc resolveMAddress*(
   if not DNS.matchPartial(address):
     res.incl(address)
   else:
-    let code = address[0].get().protoCode().get()
+    let code = address[0].tryGet().protoCode().tryGet()
     let seq = case code:
       of multiCodec("dns"):
         await self.resolveOneAddress(address)
@@ -129,7 +129,7 @@ proc resolveMAddress*(
       of multiCodec("dnsaddr"):
         await self.resolveDnsAddr(address)
       else:
-        doAssert false
+        assert false
         @[address]
     for ad in seq:
       res.incl(ad)

libp2p/observedaddrmanager.nim

@@ -9,10 +9,9 @@
 
 {.push raises: [].}
 
-import
+import std/[sequtils, tables, sugar]
-  std/[sequtils, tables],
+import chronos
-  chronos, chronicles,
+import multiaddress, multicodec
-  multiaddress, multicodec
 
 type
   ## Manages observed MultiAddresses by reomte peers. It keeps track of the most observed IP and IP/Port.
@@ -33,14 +32,16 @@ proc getProtocol(self: ObservedAddrManager, observations: seq[MultiAddress], mul
   countTable.sort()
   var orderedPairs = toSeq(countTable.pairs)
   for (ma, count) in orderedPairs:
-    let maFirst = ma[0].get()
+    let protoCode = (ma[0].flatMap(protoCode)).valueOr: continue
-    if maFirst.protoCode.get() == multiCodec and count >= self.minCount:
+    if protoCode == multiCodec and count >= self.minCount:
       return Opt.some(ma)
   return Opt.none(MultiAddress)
 
 proc getMostObservedProtocol(self: ObservedAddrManager, multiCodec: MultiCodec): Opt[MultiAddress] =
   ## Returns the most observed IP address or none if the number of observations are less than minCount.
-  let observedIPs = self.observedIPsAndPorts.mapIt(it[0].get())
+  let observedIPs = collect:
+    for observedIp in self.observedIPsAndPorts:
+      observedIp[0].valueOr: continue
   return self.getProtocol(observedIPs, multiCodec)
 
 proc getMostObservedProtoAndPort(self: ObservedAddrManager, multiCodec: MultiCodec): Opt[MultiAddress] =
@@ -51,34 +52,24 @@ proc getMostObservedProtosAndPorts*(self: ObservedAddrManager): seq[MultiAddress
   ## Returns the most observed IP4/Port and IP6/Port address or an empty seq if the number of observations
   ## are less than minCount.
   var res: seq[MultiAddress]
-  let ip4 = self.getMostObservedProtoAndPort(multiCodec("ip4"))
+  self.getMostObservedProtoAndPort(multiCodec("ip4")).withValue(ip4):
-  if ip4.isSome():
+    res.add(ip4)
-    res.add(ip4.get())
+  self.getMostObservedProtoAndPort(multiCodec("ip6")).withValue(ip6):
-  let ip6 = self.getMostObservedProtoAndPort(multiCodec("ip6"))
+    res.add(ip6)
-  if ip6.isSome():
-    res.add(ip6.get())
   return res
 
 proc guessDialableAddr*(
   self: ObservedAddrManager,
   ma: MultiAddress): MultiAddress =
-  ## Replaces the first proto valeu of each listen address by the corresponding (matching the proto code) most observed value.
+  ## Replaces the first proto value of each listen address by the corresponding (matching the proto code) most observed value.
   ## If the most observed value is not available, the original MultiAddress is returned.
-  try:
+  let
-    let maFirst = ma[0]
+    maFirst = ma[0].valueOr: return ma
-    let maRest = ma[1..^1]
+    maRest = ma[1..^1].valueOr: return ma
-    if maRest.isErr():
+    maFirstProto = maFirst.protoCode().valueOr: return ma
-      return ma
 
-    let observedIP = self.getMostObservedProtocol(maFirst.get().protoCode().get())
+  let observedIP = self.getMostObservedProtocol(maFirstProto).valueOr: return ma
-    return
+  return concat(observedIP, maRest).valueOr: ma
-      if observedIP.isNone() or maFirst.get() == observedIP.get():
-        ma
-      else:
-        observedIP.get() & maRest.get()
-  except CatchableError as error:
-    debug "Error while handling manual port forwarding", msg = error.msg
-    return ma
 
 proc `$`*(self: ObservedAddrManager): string =
   ## Returns a string representation of the ObservedAddrManager.

libp2p/peerid.nim

@@ -185,19 +185,11 @@ proc random*(t: typedesc[PeerId], rng = newRng()): Result[PeerId, cstring] =
 
 func match*(pid: PeerId, pubkey: PublicKey): bool =
   ## Returns ``true`` if ``pid`` matches public key ``pubkey``.
-  let p = PeerId.init(pubkey)
+  PeerId.init(pubkey) == Result[PeerId, cstring].ok(pid)
-  if p.isErr:
-    false
-  else:
-    pid == p.get()
 
 func match*(pid: PeerId, seckey: PrivateKey): bool =
   ## Returns ``true`` if ``pid`` matches private key ``seckey``.
-  let p = PeerId.init(seckey)
+  PeerId.init(seckey) == Result[PeerId, cstring].ok(pid)
-  if p.isErr:
-    false
-  else:
-    pid == p.get()
 
 ## Serialization/Deserialization helpers
 

libp2p/peerinfo.nim

@@ -10,7 +10,7 @@
 {.push raises: [].}
 {.push public.}
 
-import std/[options, sequtils]
+import std/sequtils
 import pkg/[chronos, chronicles, stew/results]
 import peerid, multiaddress, multicodec, crypto/crypto, routing_record, errors, utility
 
@@ -53,15 +53,12 @@ proc update*(p: PeerInfo) {.async.} =
   for mapper in p.addressMappers:
     p.addrs = await mapper(p.addrs)
 
-  let sprRes = SignedPeerRecord.init(
+  p.signedPeerRecord = SignedPeerRecord.init(
     p.privateKey,
     PeerRecord.init(p.peerId, p.addrs)
-  )
+  ).valueOr():
-  if sprRes.isOk:
+    info "Can't update the signed peer record"
-    p.signedPeerRecord = sprRes.get()
+    return
-  else:
-    discard
-    #info "Can't update the signed peer record"
 
 proc addrs*(p: PeerInfo): seq[MultiAddress] =
   p.addrs

libp2p/peerstore.nim

@@ -16,7 +16,7 @@ runnableExamples:
   # Create a custom book type
   type MoodBook = ref object of PeerBook[string]
 
-  var somePeerId = PeerId.random().get()
+  var somePeerId = PeerId.random().expect("get random key")
 
   peerStore[MoodBook][somePeerId] = "Happy"
   doAssert peerStore[MoodBook][somePeerId] == "Happy"
@@ -158,20 +158,20 @@ proc updatePeerInfo*(
   if info.addrs.len > 0:
     peerStore[AddressBook][info.peerId] = info.addrs
 
-  if info.pubkey.isSome:
+  info.pubkey.withValue(pubkey):
-    peerStore[KeyBook][info.peerId] = info.pubkey.get()
+    peerStore[KeyBook][info.peerId] = pubkey
 
-  if info.agentVersion.isSome:
+  info.agentVersion.withValue(agentVersion):
-    peerStore[AgentBook][info.peerId] = info.agentVersion.get().string
+    peerStore[AgentBook][info.peerId] = agentVersion.string
 
-  if info.protoVersion.isSome:
+  info.protoVersion.withValue(protoVersion):
-    peerStore[ProtoVersionBook][info.peerId] = info.protoVersion.get().string
+    peerStore[ProtoVersionBook][info.peerId] = protoVersion.string
 
   if info.protos.len > 0:
     peerStore[ProtoBook][info.peerId] = info.protos
 
-  if info.signedPeerRecord.isSome:
+  info.signedPeerRecord.withValue(signedPeerRecord):
-    peerStore[SPRBook][info.peerId] = info.signedPeerRecord.get()
+    peerStore[SPRBook][info.peerId] = signedPeerRecord
 
   let cleanupPos = peerStore.toClean.find(info.peerId)
   if cleanupPos >= 0:
@@ -207,11 +207,11 @@ proc identify*(
       let info = await peerStore.identify.identify(stream, stream.peerId)
 
       when defined(libp2p_agents_metrics):
-        var knownAgent = "unknown"
+        var
-        if info.agentVersion.isSome and info.agentVersion.get().len > 0:
+          knownAgent = "unknown"
-          let shortAgent = info.agentVersion.get().split("/")[0].safeToLowerAscii()
+          shortAgent = info.agentVersion.get("").split("/")[0].safeToLowerAscii().get("")
-          if shortAgent.isOk() and KnownLibP2PAgentsSeq.contains(shortAgent.get()):
+        if KnownLibP2PAgentsSeq.contains(shortAgent):
-            knownAgent = shortAgent.get()
+          knownAgent = shortAgent
         muxer.connection.setShortAgent(knownAgent)
 
       peerStore.updatePeerInfo(info)

libp2p/protobuf/minprotobuf.nim

@@ -576,26 +576,18 @@ proc getField*[T: seq[byte]|string](data: ProtoBuffer, field: int,
 proc getField*(pb: ProtoBuffer, field: int,
                output: var ProtoBuffer): ProtoResult[bool] {.inline.} =
   var buffer: seq[byte]
-  let res = pb.getField(field, buffer)
+  if ? pb.getField(field, buffer):
-  if res.isOk():
+    output = initProtoBuffer(buffer)
-    if res.get():
+    ok(true)
-      output = initProtoBuffer(buffer)
-      ok(true)
-    else:
-      ok(false)
   else:
-    err(res.error)
+    ok(false)
 
 proc getRequiredField*[T](pb: ProtoBuffer, field: int,
                output: var T): ProtoResult[void] {.inline.} =
-  let res = pb.getField(field, output)
+  if ? pb.getField(field, output):
-  if res.isOk():
+    ok()
-    if res.get():
-      ok()
-    else:
-      err(RequiredFieldMissing)
   else:
-    err(res.error)
+    err(RequiredFieldMissing)
 
 proc getRepeatedField*[T: seq[byte]|string](data: ProtoBuffer, field: int,
                                         output: var seq[T]): ProtoResult[bool] =
@@ -675,14 +667,10 @@ proc getRepeatedField*[T: ProtoScalar](data: ProtoBuffer, field: int,
 
 proc getRequiredRepeatedField*[T](pb: ProtoBuffer, field: int,
                output: var seq[T]): ProtoResult[void] {.inline.} =
-  let res = pb.getRepeatedField(field, output)
+  if ? pb.getRepeatedField(field, output):
-  if res.isOk():
+    ok()
-    if res.get():
-      ok()
-    else:
-      err(RequiredFieldMissing)
   else:
-    err(res.error)
+    err(RequiredFieldMissing)
 
 proc getPackedRepeatedField*[T: ProtoScalar](data: ProtoBuffer, field: int,
                                         output: var seq[T]): ProtoResult[bool] =

libp2p/protocols/connectivity/autonat/client.nim

@@ -9,7 +9,6 @@
 
 {.push raises: [].}
 
-import std/options
 import stew/results
 import chronos, chronicles
 import ../../../switch,
@@ -24,8 +23,8 @@ type
   AutonatClient* = ref object of RootObj
 
 proc sendDial(conn: Connection, pid: PeerId, addrs: seq[MultiAddress]) {.async.} =
-  let pb = AutonatDial(peerInfo: some(AutonatPeerInfo(
+  let pb = AutonatDial(peerInfo: Opt.some(AutonatPeerInfo(
-                         id: some(pid),
+                         id: Opt.some(pid),
                          addrs: addrs
                        ))).encode()
   await conn.writeLp(pb.buffer)
@@ -33,15 +32,13 @@ proc sendDial(conn: Connection, pid: PeerId, addrs: seq[MultiAddress]) {.async.}
 method dialMe*(self: AutonatClient, switch: Switch, pid: PeerId, addrs: seq[MultiAddress] = newSeq[MultiAddress]()):
     Future[MultiAddress] {.base, async.} =
 
-  proc getResponseOrRaise(autonatMsg: Option[AutonatMsg]): AutonatDialResponse {.raises: [AutonatError].} =
+  proc getResponseOrRaise(autonatMsg: Opt[AutonatMsg]): AutonatDialResponse {.raises: [AutonatError].} =
-    if autonatMsg.isNone() or
+    autonatMsg.withValue(msg):
-       autonatMsg.get().msgType != DialResponse or
+      if msg.msgType == DialResponse:
-       autonatMsg.get().response.isNone() or
+        msg.response.withValue(res):
-       (autonatMsg.get().response.get().status == Ok and
+          if not (res.status == Ok and res.ma.isNone()):
-        autonatMsg.get().response.get().ma.isNone()):
+            return res
-      raise newException(AutonatError, "Unexpected response")
+    raise newException(AutonatError, "Unexpected response")
-    else:
-      autonatMsg.get().response.get()
 
   let conn =
     try:
@@ -66,7 +63,7 @@ method dialMe*(self: AutonatClient, switch: Switch, pid: PeerId, addrs: seq[Mult
   let response = getResponseOrRaise(AutonatMsg.decode(await conn.readLp(1024)))
   return case response.status:
     of ResponseStatus.Ok:
-      response.ma.get()
+      response.ma.tryGet()
     of ResponseStatus.DialError:
       raise newException(AutonatUnreachableError, "Peer could not dial us back: " & response.text.get(""))
     else:

libp2p/protocols/connectivity/autonat/core.nim

@@ -9,7 +9,6 @@
 
 {.push raises: [].}
 
-import std/[options]
 import stew/[results, objects]
 import chronos, chronicles
 import ../../../multiaddress,
@@ -39,29 +38,29 @@ type
     InternalError = 300
 
   AutonatPeerInfo* = object
-    id*: Option[PeerId]
+    id*: Opt[PeerId]
     addrs*: seq[MultiAddress]
 
   AutonatDial* = object
-    peerInfo*: Option[AutonatPeerInfo]
+    peerInfo*: Opt[AutonatPeerInfo]
 
   AutonatDialResponse* = object
     status*: ResponseStatus
-    text*: Option[string]
+    text*: Opt[string]
-    ma*: Option[MultiAddress]
+    ma*: Opt[MultiAddress]
 
   AutonatMsg* = object
     msgType*: MsgType
-    dial*: Option[AutonatDial]
+    dial*: Opt[AutonatDial]
-    response*: Option[AutonatDialResponse]
+    response*: Opt[AutonatDialResponse]
 
   NetworkReachability* {.pure.} = enum
     Unknown, NotReachable, Reachable
 
 proc encode(p: AutonatPeerInfo): ProtoBuffer =
   result = initProtoBuffer()
-  if p.id.isSome():
+  p.id.withValue(id):
-    result.write(1, p.id.get())
+    result.write(1, id)
   for ma in p.addrs:
     result.write(2, ma.data.buffer)
   result.finish()
@@ -70,8 +69,8 @@ proc encode*(d: AutonatDial): ProtoBuffer =
   result = initProtoBuffer()
   result.write(1, MsgType.Dial.uint)
   var dial = initProtoBuffer()
-  if d.peerInfo.isSome():
+  d.peerInfo.withValue(pinfo):
-    dial.write(1, encode(d.peerInfo.get()))
+    dial.write(1, encode(pinfo))
   dial.finish()
   result.write(2, dial.buffer)
   result.finish()
@@ -81,72 +80,60 @@ proc encode*(r: AutonatDialResponse): ProtoBuffer =
   result.write(1, MsgType.DialResponse.uint)
   var bufferResponse = initProtoBuffer()
   bufferResponse.write(1, r.status.uint)
-  if r.text.isSome():
+  r.text.withValue(text):
-    bufferResponse.write(2, r.text.get())
+    bufferResponse.write(2, text)
-  if r.ma.isSome():
+  r.ma.withValue(ma):
-    bufferResponse.write(3, r.ma.get())
+    bufferResponse.write(3, ma)
   bufferResponse.finish()
   result.write(3, bufferResponse.buffer)
   result.finish()
 
 proc encode*(msg: AutonatMsg): ProtoBuffer =
-  if msg.dial.isSome():
+  msg.dial.withValue(dial):
-    return encode(msg.dial.get())
+    return encode(dial)
-  if msg.response.isSome():
+  msg.response.withValue(res):
-    return encode(msg.response.get())
+    return encode(res)
 
-proc decode*(_: typedesc[AutonatMsg], buf: seq[byte]): Option[AutonatMsg] =
+proc decode*(_: typedesc[AutonatMsg], buf: seq[byte]): Opt[AutonatMsg] =
   var
     msgTypeOrd: uint32
     pbDial: ProtoBuffer
     pbResponse: ProtoBuffer
     msg: AutonatMsg
 
-  let
+  let pb = initProtoBuffer(buf)
-    pb = initProtoBuffer(buf)
-    r1 = pb.getField(1, msgTypeOrd)
-    r2 = pb.getField(2, pbDial)
-    r3 = pb.getField(3, pbResponse)
-  if r1.isErr() or r2.isErr() or r3.isErr(): return none(AutonatMsg)
 
-  if r1.get() and not checkedEnumAssign(msg.msgType, msgTypeOrd):
+  if ? pb.getField(1, msgTypeOrd).toOpt() and not checkedEnumAssign(msg.msgType, msgTypeOrd):
-    return none(AutonatMsg)
+    return Opt.none(AutonatMsg)
-  if r2.get():
+  if ? pb.getField(2, pbDial).toOpt():
     var
       pbPeerInfo: ProtoBuffer
       dial: AutonatDial
-    let
+    let r4 = ? pbDial.getField(1, pbPeerInfo).toOpt()
-      r4 = pbDial.getField(1, pbPeerInfo)
-    if r4.isErr(): return none(AutonatMsg)
 
     var peerInfo: AutonatPeerInfo
-    if r4.get():
+    if r4:
       var pid: PeerId
       let
-        r5 = pbPeerInfo.getField(1, pid)
+        r5 = ? pbPeerInfo.getField(1, pid).toOpt()
-        r6 = pbPeerInfo.getRepeatedField(2, peerInfo.addrs)
+        r6 = ? pbPeerInfo.getRepeatedField(2, peerInfo.addrs).toOpt()
-      if r5.isErr() or r6.isErr(): return none(AutonatMsg)
+      if r5: peerInfo.id = Opt.some(pid)
-      if r5.get(): peerInfo.id = some(pid)
+      dial.peerInfo = Opt.some(peerInfo)
-      dial.peerInfo = some(peerInfo)
+    msg.dial = Opt.some(dial)
-    msg.dial = some(dial)
 
-  if r3.get():
+  if ? pb.getField(3, pbResponse).toOpt():
     var
       statusOrd: uint
       text: string
       ma: MultiAddress
       response: AutonatDialResponse
 
-    let
+    if ? pbResponse.getField(1, statusOrd).optValue():
-      r4 = pbResponse.getField(1, statusOrd)
+      if not checkedEnumAssign(response.status, statusOrd):
-      r5 = pbResponse.getField(2, text)
+        return Opt.none(AutonatMsg)
-      r6 = pbResponse.getField(3, ma)
+    if ? pbResponse.getField(2, text).optValue():
-
+      response.text = Opt.some(text)
-    if r4.isErr() or r5.isErr() or r6.isErr() or
+    if ? pbResponse.getField(3, ma).optValue():
-       (r4.get() and not checkedEnumAssign(response.status, statusOrd)):
+      response.ma = Opt.some(ma)
-      return none(AutonatMsg)
+    msg.response = Opt.some(response)
-    if r5.get(): response.text = some(text)
+  return Opt.some(msg)
-    if r6.get(): response.ma = some(ma)
-    msg.response = some(response)
-
-  return some(msg)

libp2p/protocols/connectivity/autonat/server.nim

@@ -9,7 +9,7 @@
 
 {.push raises: [].}
 
-import std/[options, sets, sequtils]
+import std/[sets, sequtils]
 import stew/results
 import chronos, chronicles
 import ../../protocol,
@@ -33,8 +33,8 @@ type
     dialTimeout: Duration
 
 proc sendDial(conn: Connection, pid: PeerId, addrs: seq[MultiAddress]) {.async.} =
-  let pb = AutonatDial(peerInfo: some(AutonatPeerInfo(
+  let pb = AutonatDial(peerInfo: Opt.some(AutonatPeerInfo(
-                         id: some(pid),
+                         id: Opt.some(pid),
                          addrs: addrs
                        ))).encode()
   await conn.writeLp(pb.buffer)
@@ -42,16 +42,16 @@ proc sendDial(conn: Connection, pid: PeerId, addrs: seq[MultiAddress]) {.async.}
 proc sendResponseError(conn: Connection, status: ResponseStatus, text: string = "") {.async.} =
   let pb = AutonatDialResponse(
              status: status,
-             text: if text == "": none(string) else: some(text),
+             text: if text == "": Opt.none(string) else: Opt.some(text),
-             ma: none(MultiAddress)
+             ma: Opt.none(MultiAddress)
            ).encode()
   await conn.writeLp(pb.buffer)
 
 proc sendResponseOk(conn: Connection, ma: MultiAddress) {.async.} =
   let pb = AutonatDialResponse(
              status: ResponseStatus.Ok,
-             text: some("Ok"),
+             text: Opt.some("Ok"),
-             ma: some(ma)
+             ma: Opt.some(ma)
            ).encode()
   await conn.writeLp(pb.buffer)
 
@@ -70,8 +70,8 @@ proc tryDial(autonat: Autonat, conn: Connection, addrs: seq[MultiAddress]) {.asy
     futs = addrs.mapIt(autonat.switch.dialer.tryDial(conn.peerId, @[it]))
     let fut = await anyCompleted(futs).wait(autonat.dialTimeout)
     let ma = await fut
-    if ma.isSome:
+    ma.withValue(maddr):
-      await conn.sendResponseOk(ma.get())
+      await conn.sendResponseOk(maddr)
     else:
       await conn.sendResponseError(DialError, "Missing observed address")
   except CancelledError as exc:
@@ -92,42 +92,40 @@ proc tryDial(autonat: Autonat, conn: Connection, addrs: seq[MultiAddress]) {.asy
         f.cancel()
 
 proc handleDial(autonat: Autonat, conn: Connection, msg: AutonatMsg): Future[void] =
-  if msg.dial.isNone() or msg.dial.get().peerInfo.isNone():
+  let dial = msg.dial.valueOr:
+    return conn.sendResponseError(BadRequest, "Missing Dial")
+  let peerInfo = dial.peerInfo.valueOr:
     return conn.sendResponseError(BadRequest, "Missing Peer Info")
-  let peerInfo = msg.dial.get().peerInfo.get()
+  peerInfo.id.withValue(id):
-  if peerInfo.id.isSome() and peerInfo.id.get() != conn.peerId:
+    if id != conn.peerId:
-    return conn.sendResponseError(BadRequest, "PeerId mismatch")
+      return conn.sendResponseError(BadRequest, "PeerId mismatch")
 
-  if conn.observedAddr.isNone:
+  let observedAddr = conn.observedAddr.valueOr:
     return conn.sendResponseError(BadRequest, "Missing observed address")
-  let observedAddr = conn.observedAddr.get()
 
-  var isRelayed = observedAddr.contains(multiCodec("p2p-circuit"))
+  var isRelayed = observedAddr.contains(multiCodec("p2p-circuit")).valueOr:
-  if isRelayed.isErr() or isRelayed.get():
+    return conn.sendResponseError(DialRefused, "Invalid observed address")
+  if isRelayed:
     return conn.sendResponseError(DialRefused, "Refused to dial a relayed observed address")
-  let hostIp = observedAddr[0]
+  let hostIp = observedAddr[0].valueOr:
-  if hostIp.isErr() or not IP.match(hostIp.get()):
+    return conn.sendResponseError(InternalError, "Wrong observed address")
-    trace "wrong observed address", address=observedAddr
+  if not IP.match(hostIp):
     return conn.sendResponseError(InternalError, "Expected an IP address")
   var addrs = initHashSet[MultiAddress]()
   addrs.incl(observedAddr)
   trace "addrs received", addrs = peerInfo.addrs
   for ma in peerInfo.addrs:
-    isRelayed = ma.contains(multiCodec("p2p-circuit"))
+    isRelayed = ma.contains(multiCodec("p2p-circuit")).valueOr: continue
-    if isRelayed.isErr() or isRelayed.get():
+    let maFirst = ma[0].valueOr: continue
-      continue
+    if not DNS_OR_IP.match(maFirst): continue
-    let maFirst = ma[0]
-    if maFirst.isErr() or not DNS_OR_IP.match(maFirst.get()):
-      continue
 
     try:
       addrs.incl(
-        if maFirst.get() == hostIp.get():
+        if maFirst == hostIp:
           ma
         else:
-          let maEnd = ma[1..^1]
+          let maEnd = ma[1..^1].valueOr: continue
-          if maEnd.isErr(): continue
+          hostIp & maEnd
-          hostIp.get() & maEnd.get()
       )
     except LPError as exc:
       continue
@@ -144,10 +142,10 @@ proc new*(T: typedesc[Autonat], switch: Switch, semSize: int = 1, dialTimeout =
   let autonat = T(switch: switch, sem: newAsyncSemaphore(semSize), dialTimeout: dialTimeout)
   proc handleStream(conn: Connection, proto: string) {.async, gcsafe.} =
     try:
-      let msgOpt = AutonatMsg.decode(await conn.readLp(1024))
+      let msg = AutonatMsg.decode(await conn.readLp(1024)).valueOr:
-      if msgOpt.isNone() or msgOpt.get().msgType != MsgType.Dial:
         raise newException(AutonatError, "Received malformed message")
-      let msg = msgOpt.get()
+      if msg.msgType != MsgType.Dial:
+        raise newException(AutonatError, "Message type should be dial")
       await autonat.handleDial(conn, msg)
     except CancelledError as exc:
       raise exc

libp2p/protocols/connectivity/autonat/service.nim

@@ -9,7 +9,7 @@
 
 {.push raises: [].}
 
-import std/[options, deques, sequtils]
+import std/[deques, sequtils]
 import chronos, metrics
 import ../../../switch
 import ../../../wire
@@ -18,7 +18,7 @@ from core import NetworkReachability, AutonatUnreachableError
 import ../../../utils/heartbeat
 import ../../../crypto/crypto
 
-export options, core.NetworkReachability
+export core.NetworkReachability
 
 logScope:
   topics = "libp2p autonatservice"
@@ -31,12 +31,12 @@ type
     addressMapper: AddressMapper
     scheduleHandle: Future[void]
     networkReachability*: NetworkReachability
-    confidence: Option[float]
+    confidence: Opt[float]
     answers: Deque[NetworkReachability]
     autonatClient: AutonatClient
     statusAndConfidenceHandler: StatusAndConfidenceHandler
     rng: ref HmacDrbgContext
-    scheduleInterval: Option[Duration]
+    scheduleInterval: Opt[Duration]
     askNewConnectedPeers: bool
     numPeersToAsk: int
     maxQueueSize: int
@@ -44,13 +44,13 @@ type
     dialTimeout: Duration
     enableAddressMapper: bool
 
-  StatusAndConfidenceHandler* = proc (networkReachability: NetworkReachability, confidence: Option[float]): Future[void]  {.gcsafe, raises: [].}
+  StatusAndConfidenceHandler* = proc (networkReachability: NetworkReachability, confidence: Opt[float]): Future[void]  {.gcsafe, raises: [].}
 
 proc new*(
   T: typedesc[AutonatService],
   autonatClient: AutonatClient,
   rng: ref HmacDrbgContext,
-  scheduleInterval: Option[Duration] = none(Duration),
+  scheduleInterval: Opt[Duration] = Opt.none(Duration),
   askNewConnectedPeers = true,
   numPeersToAsk: int = 5,
   maxQueueSize: int = 10,
@@ -60,7 +60,7 @@ proc new*(
   return T(
     scheduleInterval: scheduleInterval,
     networkReachability: Unknown,
-    confidence: none(float),
+    confidence: Opt.none(float),
     answers: initDeque[NetworkReachability](),
     autonatClient: autonatClient,
     rng: rng,
@@ -95,14 +95,14 @@ proc handleAnswer(self: AutonatService, ans: NetworkReachability): Future[bool]
   self.answers.addLast(ans)
 
   self.networkReachability = Unknown
-  self.confidence = none(float)
+  self.confidence = Opt.none(float)
   const reachabilityPriority = [Reachable, NotReachable]
   for reachability in reachabilityPriority:
     let confidence = self.answers.countIt(it == reachability) / self.maxQueueSize
     libp2p_autonat_reachability_confidence.set(value = confidence, labelValues = [$reachability])
     if self.confidence.isNone and confidence >= self.minConfidence:
       self.networkReachability = reachability
-      self.confidence = some(confidence)
+      self.confidence = Opt.some(confidence)
 
   debug "Current status", currentStats = $self.networkReachability, confidence = $self.confidence, answers = self.answers
 
@@ -189,8 +189,8 @@ method setup*(self: AutonatService, switch: Switch): Future[bool] {.async.} =
       self.newConnectedPeerHandler = proc (peerId: PeerId, event: PeerEvent): Future[void] {.async.} =
         discard askPeer(self, switch, peerId)
       switch.connManager.addPeerEventHandler(self.newConnectedPeerHandler, PeerEventKind.Joined)
-    if self.scheduleInterval.isSome():
+    self.scheduleInterval.withValue(interval):
-      self.scheduleHandle = schedule(self, switch, self.scheduleInterval.get())
+      self.scheduleHandle = schedule(self, switch, interval)
     if self.enableAddressMapper:
       switch.peerInfo.addressMappers.add(self.addressMapper)
   return hasBeenSetup

libp2p/protocols/connectivity/dcutr/server.nim

@@ -9,8 +9,7 @@
 
 {.push raises: [].}
 
-import std/[options, sets, sequtils]
+import std/[sets, sequtils]
-
 import stew/[results, objects]
 import chronos, chronicles
 

libp2p/protocols/connectivity/relay/client.nim

@@ -9,10 +9,8 @@
 
 {.push raises: [].}
 
-import times, options
+import times
-
 import chronos, chronicles
-
 import ./relay,
        ./messages,
        ./rconn,
@@ -22,8 +20,6 @@ import ./relay,
        ../../../multiaddress,
        ../../../stream/connection
 
-export options
-
 logScope:
   topics = "libp2p relay relay-client"
 
@@ -44,28 +40,27 @@ type
   Rsvp* = object
     expire*: uint64           # required, Unix expiration time (UTC)
     addrs*: seq[MultiAddress] # relay address for reserving peer
-    voucher*: Option[Voucher] # optional, reservation voucher
+    voucher*: Opt[Voucher]    # optional, reservation voucher
     limitDuration*: uint32    # seconds
     limitData*: uint64        # bytes
 
 proc sendStopError(conn: Connection, code: StatusV2) {.async.} =
   trace "send stop status", status = $code & " (" & $ord(code) & ")"
-  let msg = StopMessage(msgType: StopMessageType.Status, status: some(code))
+  let msg = StopMessage(msgType: StopMessageType.Status, status: Opt.some(code))
   await conn.writeLp(encode(msg).buffer)
 
 proc handleRelayedConnect(cl: RelayClient, conn: Connection, msg: StopMessage) {.async.} =
-  if msg.peer.isNone():
-    await sendStopError(conn, MalformedMessage)
-    return
   let
     # TODO: check the go version to see in which way this could fail
     # it's unclear in the spec
-    src = msg.peer.get()
+    src = msg.peer.valueOr:
+      await sendStopError(conn, MalformedMessage)
+      return
     limitDuration = msg.limit.duration
     limitData = msg.limit.data
     msg = StopMessage(
       msgType: StopMessageType.Status,
-      status: some(Ok))
+      status: Opt.some(Ok))
     pb = encode(msg)
 
   trace "incoming relay connection", src
@@ -89,7 +84,7 @@ proc reserve*(cl: RelayClient,
     pb = encode(HopMessage(msgType: HopMessageType.Reserve))
     msg = try:
       await conn.writeLp(pb.buffer)
-      HopMessage.decode(await conn.readLp(RelayClientMsgSize)).get()
+      HopMessage.decode(await conn.readLp(RelayClientMsgSize)).tryGet()
     except CancelledError as exc:
       raise exc
     except CatchableError as exc:
@@ -100,21 +95,21 @@ proc reserve*(cl: RelayClient,
     raise newException(ReservationError, "Unexpected relay response type")
   if msg.status.get(UnexpectedMessage) != Ok:
     raise newException(ReservationError, "Reservation failed")
-  if msg.reservation.isNone():
-    raise newException(ReservationError, "Missing reservation information")
 
-  let reservation = msg.reservation.get()
+  let reservation = msg.reservation.valueOr:
+    raise newException(ReservationError, "Missing reservation information")
   if reservation.expire > int64.high().uint64 or
      now().utc > reservation.expire.int64.fromUnix.utc:
     raise newException(ReservationError, "Bad expiration date")
   result.expire = reservation.expire
   result.addrs = reservation.addrs
 
-  if reservation.svoucher.isSome():
+  reservation.svoucher.withValue(sv):
-    let svoucher = SignedVoucher.decode(reservation.svoucher.get())
+    let svoucher = SignedVoucher.decode(sv).valueOr:
-    if svoucher.isErr() or svoucher.get().data.relayPeerId != peerId:
       raise newException(ReservationError, "Invalid voucher")
-    result.voucher = some(svoucher.get().data)
+    if svoucher.data.relayPeerId != peerId:
+      raise newException(ReservationError, "Invalid voucher PeerId")
+    result.voucher = Opt.some(svoucher.data)
 
   result.limitDuration = msg.limit.duration
   result.limitData = msg.limit.data
@@ -126,9 +121,9 @@ proc dialPeerV1*(
     dstAddrs: seq[MultiAddress]): Future[Connection] {.async.} =
   var
     msg = RelayMessage(
-      msgType: some(RelayType.Hop),
+      msgType: Opt.some(RelayType.Hop),
-      srcPeer: some(RelayPeer(peerId: cl.switch.peerInfo.peerId, addrs: cl.switch.peerInfo.addrs)),
+      srcPeer: Opt.some(RelayPeer(peerId: cl.switch.peerInfo.peerId, addrs: cl.switch.peerInfo.addrs)),
-      dstPeer: some(RelayPeer(peerId: dstPeerId, addrs: dstAddrs)))
+      dstPeer: Opt.some(RelayPeer(peerId: dstPeerId, addrs: dstAddrs)))
     pb = encode(msg)
 
   trace "Dial peer", msgSend=msg
@@ -151,16 +146,18 @@ proc dialPeerV1*(
     raise exc
 
   try:
-    if msgRcvFromRelayOpt.isNone:
+    let msgRcvFromRelay = msgRcvFromRelayOpt.valueOr:
       raise newException(RelayV1DialError, "Hop can't open destination stream")
-    let msgRcvFromRelay = msgRcvFromRelayOpt.get()
+    if msgRcvFromRelay.msgType.tryGet() != RelayType.Status:
-    if msgRcvFromRelay.msgType.isNone or msgRcvFromRelay.msgType.get() != RelayType.Status:
       raise newException(RelayV1DialError, "Hop can't open destination stream: wrong message type")
-    if msgRcvFromRelay.status.isNone or msgRcvFromRelay.status.get() != StatusV1.Success:
+    if msgRcvFromRelay.status.tryGet() != StatusV1.Success:
       raise newException(RelayV1DialError, "Hop can't open destination stream: status failed")
   except RelayV1DialError as exc:
     await sendStatus(conn, StatusV1.HopCantOpenDstStream)
     raise exc
+  except ValueError as exc:
+    await sendStatus(conn, StatusV1.HopCantOpenDstStream)
+    raise newException(RelayV1DialError, exc.msg)
   result = conn
 
 proc dialPeerV2*(
@@ -170,13 +167,13 @@ proc dialPeerV2*(
     dstAddrs: seq[MultiAddress]): Future[Connection] {.async.} =
   let
     p = Peer(peerId: dstPeerId, addrs: dstAddrs)
-    pb = encode(HopMessage(msgType: HopMessageType.Connect, peer: some(p)))
+    pb = encode(HopMessage(msgType: HopMessageType.Connect, peer: Opt.some(p)))
 
   trace "Dial peer", p
 
   let msgRcvFromRelay = try:
     await conn.writeLp(pb.buffer)
-    HopMessage.decode(await conn.readLp(RelayClientMsgSize)).get()
+    HopMessage.decode(await conn.readLp(RelayClientMsgSize)).tryGet()
   except CancelledError as exc:
     raise exc
   except CatchableError as exc:
@@ -186,19 +183,17 @@ proc dialPeerV2*(
   if msgRcvFromRelay.msgType != HopMessageType.Status:
     raise newException(RelayV2DialError, "Unexpected stop response")
   if msgRcvFromRelay.status.get(UnexpectedMessage) != Ok:
-    trace "Relay stop failed", msg = msgRcvFromRelay.status.get()
+    trace "Relay stop failed", msg = msgRcvFromRelay.status
     raise newException(RelayV2DialError, "Relay stop failure")
   conn.limitDuration = msgRcvFromRelay.limit.duration
   conn.limitData = msgRcvFromRelay.limit.data
   return conn
 
 proc handleStopStreamV2(cl: RelayClient, conn: Connection) {.async, gcsafe.} =
-  let msgOpt = StopMessage.decode(await conn.readLp(RelayClientMsgSize))
+  let msg = StopMessage.decode(await conn.readLp(RelayClientMsgSize)).valueOr:
-  if msgOpt.isNone():
     await sendHopStatus(conn, MalformedMessage)
     return
-  trace "client circuit relay v2 handle stream", msg = msgOpt.get()
+  trace "client circuit relay v2 handle stream", msg
-  let msg = msgOpt.get()
 
   if msg.msgType == StopMessageType.Connect:
     await cl.handleRelayedConnect(conn, msg)
@@ -207,16 +202,14 @@ proc handleStopStreamV2(cl: RelayClient, conn: Connection) {.async, gcsafe.} =
     await sendStopError(conn, MalformedMessage)
 
 proc handleStop(cl: RelayClient, conn: Connection, msg: RelayMessage) {.async, gcsafe.} =
-  if msg.srcPeer.isNone:
+  let src = msg.srcPeer.valueOr:
     await sendStatus(conn, StatusV1.StopSrcMultiaddrInvalid)
     return
-  let src = msg.srcPeer.get()
 
-  if msg.dstPeer.isNone:
+  let dst = msg.dstPeer.valueOr:
     await sendStatus(conn, StatusV1.StopDstMultiaddrInvalid)
     return
 
-  let dst = msg.dstPeer.get()
   if dst.peerId != cl.switch.peerInfo.peerId:
     await sendStatus(conn, StatusV1.StopDstMultiaddrInvalid)
     return
@@ -234,13 +227,16 @@ proc handleStop(cl: RelayClient, conn: Connection, msg: RelayMessage) {.async, g
   else: await conn.close()
 
 proc handleStreamV1(cl: RelayClient, conn: Connection) {.async, gcsafe.} =
-  let msgOpt = RelayMessage.decode(await conn.readLp(RelayClientMsgSize))
+  let msg = RelayMessage.decode(await conn.readLp(RelayClientMsgSize)).valueOr:
-  if msgOpt.isNone:
     await sendStatus(conn, StatusV1.MalformedMessage)
     return
-  trace "client circuit relay v1 handle stream", msg = msgOpt.get()
+  trace "client circuit relay v1 handle stream", msg
-  let msg = msgOpt.get()
+
-  case msg.msgType.get:
+  let typ = msg.msgType.valueOr:
+    trace "Message type not set"
+    await sendStatus(conn, StatusV1.MalformedMessage)
+    return
+  case typ:
     of RelayType.Hop:
       if cl.canHop: await cl.handleHop(conn, msg)
       else: await sendStatus(conn, StatusV1.HopCantSpeakRelay)

libp2p/protocols/connectivity/relay/messages.nim

@@ -9,8 +9,8 @@
 
 {.push raises: [].}
 
-import options, macros
+import macros
-import stew/objects
+import stew/[objects, results]
 import ../../../peerinfo,
        ../../../signed_envelope
 
@@ -46,36 +46,36 @@ type
     addrs*: seq[MultiAddress]
 
   RelayMessage* = object
-    msgType*: Option[RelayType]
+    msgType*: Opt[RelayType]
-    srcPeer*: Option[RelayPeer]
+    srcPeer*: Opt[RelayPeer]
-    dstPeer*: Option[RelayPeer]
+    dstPeer*: Opt[RelayPeer]
-    status*: Option[StatusV1]
+    status*: Opt[StatusV1]
 
 proc encode*(msg: RelayMessage): ProtoBuffer =
   result = initProtoBuffer()
 
-  if isSome(msg.msgType):
+  msg.msgType.withValue(typ):
-    result.write(1, msg.msgType.get().ord.uint)
+    result.write(1, typ.ord.uint)
-  if isSome(msg.srcPeer):
+  msg.srcPeer.withValue(srcPeer):
     var peer = initProtoBuffer()
-    peer.write(1, msg.srcPeer.get().peerId)
+    peer.write(1, srcPeer.peerId)
-    for ma in msg.srcPeer.get().addrs:
+    for ma in srcPeer.addrs:
       peer.write(2, ma.data.buffer)
     peer.finish()
     result.write(2, peer.buffer)
-  if isSome(msg.dstPeer):
+  msg.dstPeer.withValue(dstPeer):
     var peer = initProtoBuffer()
-    peer.write(1, msg.dstPeer.get().peerId)
+    peer.write(1, dstPeer.peerId)
-    for ma in msg.dstPeer.get().addrs:
+    for ma in dstPeer.addrs:
       peer.write(2, ma.data.buffer)
     peer.finish()
     result.write(3, peer.buffer)
-  if isSome(msg.status):
+  msg.status.withValue(status):
-    result.write(4, msg.status.get().ord.uint)
+    result.write(4, status.ord.uint)
 
   result.finish()
 
-proc decode*(_: typedesc[RelayMessage], buf: seq[byte]): Option[RelayMessage] =
+proc decode*(_: typedesc[RelayMessage], buf: seq[byte]): Opt[RelayMessage] =
   var
     rMsg: RelayMessage
     msgTypeOrd: uint32
@@ -85,38 +85,29 @@ proc decode*(_: typedesc[RelayMessage], buf: seq[byte]): Option[RelayMessage] =
     pbSrc: ProtoBuffer
     pbDst: ProtoBuffer
 
-  let
+  let pb = initProtoBuffer(buf)
-    pb = initProtoBuffer(buf)
-    r1 = pb.getField(1, msgTypeOrd)
-    r2 = pb.getField(2, pbSrc)
-    r3 = pb.getField(3, pbDst)
-    r4 = pb.getField(4, statusOrd)
 
-  if r1.isErr() or r2.isErr() or r3.isErr() or r4.isErr():
+  if ? pb.getField(1, msgTypeOrd).toOpt():
-    return none(RelayMessage)
-
-  if r2.get() and
-     (pbSrc.getField(1, src.peerId).isErr() or
-      pbSrc.getRepeatedField(2, src.addrs).isErr()):
-    return none(RelayMessage)
-
-  if r3.get() and
-     (pbDst.getField(1, dst.peerId).isErr() or
-      pbDst.getRepeatedField(2, dst.addrs).isErr()):
-    return none(RelayMessage)
-
-  if r1.get():
     if msgTypeOrd.int notin RelayType:
-      return none(RelayMessage)
+      return Opt.none(RelayMessage)
-    rMsg.msgType = some(RelayType(msgTypeOrd))
+    rMsg.msgType = Opt.some(RelayType(msgTypeOrd))
-  if r2.get(): rMsg.srcPeer = some(src)
+
-  if r3.get(): rMsg.dstPeer = some(dst)
+  if ? pb.getField(2, pbSrc).toOpt():
-  if r4.get():
+    discard ? pbSrc.getField(1, src.peerId).toOpt()
+    discard ? pbSrc.getRepeatedField(2, src.addrs).toOpt()
+    rMsg.srcPeer = Opt.some(src)
+
+  if ? pb.getField(3, pbDst).toOpt():
+    discard ? pbDst.getField(1, dst.peerId).toOpt()
+    discard ? pbDst.getRepeatedField(2, dst.addrs).toOpt()
+    rMsg.dstPeer = Opt.some(dst)
+
+  if ? pb.getField(4, statusOrd).toOpt():
     var status: StatusV1
     if not checkedEnumAssign(status, statusOrd):
-      return none(RelayMessage)
+      return Opt.none(RelayMessage)
-    rMsg.status = some(status)
+    rMsg.status = Opt.some(status)
-  some(rMsg)
+  Opt.some(rMsg)
 
 # Voucher
 
@@ -176,7 +167,7 @@ type
   Reservation* = object
     expire*: uint64              # required, Unix expiration time (UTC)
     addrs*: seq[MultiAddress]    # relay address for reserving peer
-    svoucher*: Option[seq[byte]] # optional, reservation voucher
+    svoucher*: Opt[seq[byte]]    # optional, reservation voucher
   Limit* = object
     duration*: uint32            # seconds
     data*: uint64                # bytes
@@ -196,30 +187,29 @@ type
     Status = 2
   HopMessage* = object
     msgType*: HopMessageType
-    peer*: Option[Peer]
+    peer*: Opt[Peer]
-    reservation*: Option[Reservation]
+    reservation*: Opt[Reservation]
     limit*: Limit
-    status*: Option[StatusV2]
+    status*: Opt[StatusV2]
 
 proc encode*(msg: HopMessage): ProtoBuffer =
   var pb = initProtoBuffer()
 
   pb.write(1, msg.msgType.ord.uint)
-  if msg.peer.isSome():
+  msg.peer.withValue(peer):
     var ppb = initProtoBuffer()
-    ppb.write(1, msg.peer.get().peerId)
+    ppb.write(1, peer.peerId)
-    for ma in msg.peer.get().addrs:
+    for ma in peer.addrs:
       ppb.write(2, ma.data.buffer)
     ppb.finish()
     pb.write(2, ppb.buffer)
-  if msg.reservation.isSome():
+  msg.reservation.withValue(rsrv):
-    let rsrv = msg.reservation.get()
     var rpb = initProtoBuffer()
     rpb.write(1, rsrv.expire)
     for ma in rsrv.addrs:
       rpb.write(2, ma.data.buffer)
-    if rsrv.svoucher.isSome():
+    rsrv.svoucher.withValue(vouch):
-      rpb.write(3, rsrv.svoucher.get())
+      rpb.write(3, vouch)
     rpb.finish()
     pb.write(3, rpb.buffer)
   if msg.limit.duration > 0 or msg.limit.data > 0:
@@ -228,66 +218,51 @@ proc encode*(msg: HopMessage): ProtoBuffer =
     if msg.limit.data > 0: lpb.write(2, msg.limit.data)
     lpb.finish()
     pb.write(4, lpb.buffer)
-  if msg.status.isSome():
+  msg.status.withValue(status):
-    pb.write(5, msg.status.get().ord.uint)
+    pb.write(5, status.ord.uint)
 
   pb.finish()
   pb
 
-proc decode*(_: typedesc[HopMessage], buf: seq[byte]): Option[HopMessage] =
+proc decode*(_: typedesc[HopMessage], buf: seq[byte]): Opt[HopMessage] =
-  var
+  var msg: HopMessage
-    msg: HopMessage
+  let pb = initProtoBuffer(buf)
-    msgTypeOrd: uint32
-    pbPeer: ProtoBuffer
-    pbReservation: ProtoBuffer
-    pbLimit: ProtoBuffer
-    statusOrd: uint32
-    peer: Peer
-    reservation: Reservation
-    limit: Limit
-    res: bool
-
-  let
-    pb = initProtoBuffer(buf)
-    r1 = pb.getRequiredField(1, msgTypeOrd)
-    r2 = pb.getField(2, pbPeer)
-    r3 = pb.getField(3, pbReservation)
-    r4 = pb.getField(4, pbLimit)
-    r5 = pb.getField(5, statusOrd)
-
-  if r1.isErr() or r2.isErr() or r3.isErr() or r4.isErr() or r5.isErr():
-    return none(HopMessage)
-
-  if r2.get() and
-     (pbPeer.getRequiredField(1, peer.peerId).isErr() or
-      pbPeer.getRepeatedField(2, peer.addrs).isErr()):
-    return none(HopMessage)
-
-  if r3.get():
-    var svoucher: seq[byte]
-    let rSVoucher = pbReservation.getField(3, svoucher)
-    if pbReservation.getRequiredField(1, reservation.expire).isErr() or
-       pbReservation.getRepeatedField(2, reservation.addrs).isErr() or
-       rSVoucher.isErr():
-      return none(HopMessage)
-    if rSVoucher.get(): reservation.svoucher = some(svoucher)
-
-  if r4.get() and
-     (pbLimit.getField(1, limit.duration).isErr() or
-      pbLimit.getField(2, limit.data).isErr()):
-    return none(HopMessage)
 
+  var msgTypeOrd: uint32
+  ? pb.getRequiredField(1, msgTypeOrd).toOpt()
   if not checkedEnumAssign(msg.msgType, msgTypeOrd):
-    return none(HopMessage)
+    return Opt.none(HopMessage)
-  if r2.get(): msg.peer = some(peer)
+
-  if r3.get(): msg.reservation = some(reservation)
+  var pbPeer: ProtoBuffer
-  if r4.get(): msg.limit = limit
+  if ? pb.getField(2, pbPeer).toOpt():
-  if r5.get():
+    var peer: Peer
+    ? pbPeer.getRequiredField(1, peer.peerId).toOpt()
+    discard ? pbPeer.getRepeatedField(2, peer.addrs).toOpt()
+    msg.peer = Opt.some(peer)
+
+  var pbReservation: ProtoBuffer
+  if ? pb.getField(3, pbReservation).toOpt():
+    var
+      svoucher: seq[byte]
+      reservation: Reservation
+    if ? pbReservation.getField(3, svoucher).toOpt():
+      reservation.svoucher = Opt.some(svoucher)
+    ? pbReservation.getRequiredField(1, reservation.expire).toOpt()
+    discard ? pbReservation.getRepeatedField(2, reservation.addrs).toOpt()
+    msg.reservation = Opt.some(reservation)
+
+  var pbLimit: ProtoBuffer
+  if ? pb.getField(4, pbLimit).toOpt():
+    discard ? pbLimit.getField(1, msg.limit.duration).toOpt()
+    discard ? pbLimit.getField(2, msg.limit.data).toOpt()
+
+  var statusOrd: uint32
+  if ? pb.getField(5, statusOrd).toOpt():
     var status: StatusV2
     if not checkedEnumAssign(status, statusOrd):
-      return none(HopMessage)
+      return Opt.none(HopMessage)
-    msg.status = some(status)
+    msg.status = Opt.some(status)
-  some(msg)
+  Opt.some(msg)
 
 # Circuit Relay V2 Stop Message
 
@@ -297,19 +272,19 @@ type
     Status = 1
   StopMessage* = object
     msgType*: StopMessageType
-    peer*: Option[Peer]
+    peer*: Opt[Peer]
     limit*: Limit
-    status*: Option[StatusV2]
+    status*: Opt[StatusV2]
 
 
 proc encode*(msg: StopMessage): ProtoBuffer =
   var pb = initProtoBuffer()
 
   pb.write(1, msg.msgType.ord.uint)
-  if msg.peer.isSome():
+  msg.peer.withValue(peer):
     var ppb = initProtoBuffer()
-    ppb.write(1, msg.peer.get().peerId)
+    ppb.write(1, peer.peerId)
-    for ma in msg.peer.get().addrs:
+    for ma in peer.addrs:
       ppb.write(2, ma.data.buffer)
     ppb.finish()
     pb.write(2, ppb.buffer)
@@ -319,52 +294,40 @@ proc encode*(msg: StopMessage): ProtoBuffer =
     if msg.limit.data > 0: lpb.write(2, msg.limit.data)
     lpb.finish()
     pb.write(3, lpb.buffer)
-  if msg.status.isSome():
+  msg.status.withValue(status):
-    pb.write(4, msg.status.get().ord.uint)
+    pb.write(4, status.ord.uint)
 
   pb.finish()
   pb
 
-proc decode*(_: typedesc[StopMessage], buf: seq[byte]): Option[StopMessage] =
+proc decode*(_: typedesc[StopMessage], buf: seq[byte]): Opt[StopMessage] =
-  var
+  var msg: StopMessage
-    msg: StopMessage
-    msgTypeOrd: uint32
-    pbPeer: ProtoBuffer
-    pbLimit: ProtoBuffer
-    statusOrd: uint32
-    peer: Peer
-    limit: Limit
-    rVoucher: ProtoResult[bool]
-    res: bool
 
-  let
+  let pb = initProtoBuffer(buf)
-    pb = initProtoBuffer(buf)
-    r1 = pb.getRequiredField(1, msgTypeOrd)
-    r2 = pb.getField(2, pbPeer)
-    r3 = pb.getField(3, pbLimit)
-    r4 = pb.getField(4, statusOrd)
 
-  if r1.isErr() or r2.isErr() or r3.isErr() or r4.isErr():
+  var msgTypeOrd: uint32
-    return none(StopMessage)
+  ? pb.getRequiredField(1, msgTypeOrd).toOpt()
-
+  if msgTypeOrd.int notin StopMessageType:
-  if r2.get() and
+    return Opt.none(StopMessage)
-     (pbPeer.getRequiredField(1, peer.peerId).isErr() or
-      pbPeer.getRepeatedField(2, peer.addrs).isErr()):
-    return none(StopMessage)
-
-  if r3.get() and
-     (pbLimit.getField(1, limit.duration).isErr() or
-      pbLimit.getField(2, limit.data).isErr()):
-    return none(StopMessage)
-
-  if msgTypeOrd.int notin StopMessageType.low.ord .. StopMessageType.high.ord:
-    return none(StopMessage)
   msg.msgType = StopMessageType(msgTypeOrd)
-  if r2.get(): msg.peer = some(peer)
+
-  if r3.get(): msg.limit = limit
+
-  if r4.get():
+  var pbPeer: ProtoBuffer
+  if ? pb.getField(2, pbPeer).toOpt():
+    var peer: Peer
+    ? pbPeer.getRequiredField(1, peer.peerId).toOpt()
+    discard ? pbPeer.getRepeatedField(2, peer.addrs).toOpt()
+    msg.peer = Opt.some(peer)
+
+  var pbLimit: ProtoBuffer
+  if ? pb.getField(3, pbLimit).toOpt():
+    discard ? pbLimit.getField(1, msg.limit.duration).toOpt()
+    discard ? pbLimit.getField(2, msg.limit.data).toOpt()
+
+  var statusOrd: uint32
+  if ? pb.getField(4, statusOrd).toOpt():
     var status: StatusV2
     if not checkedEnumAssign(status, statusOrd):
-      return none(StopMessage)
+      return Opt.none(StopMessage)
-    msg.status = some(status)
+    msg.status = Opt.some(status)
-  some(msg)
+  Opt.some(msg)

libp2p/protocols/connectivity/relay/relay.nim

@@ -9,7 +9,7 @@
 
 {.push raises: [].}
 
-import options, sequtils, tables
+import sequtils, tables
 
 import chronos, chronicles
 
@@ -90,11 +90,11 @@ proc createReserveResponse(
     rsrv = Reservation(expire: expireUnix,
                        addrs: r.switch.peerInfo.addrs.mapIt(
                          ? it.concat(ma).orErr(CryptoError.KeyError)),
-                       svoucher: some(? sv.encode))
+                       svoucher: Opt.some(? sv.encode))
     msg = HopMessage(msgType: HopMessageType.Status,
-                     reservation: some(rsrv),
+                     reservation: Opt.some(rsrv),
                      limit: r.limit,
-                     status: some(Ok))
+                     status: Opt.some(Ok))
   return ok(msg)
 
 proc isRelayed*(conn: Connection): bool =
@@ -115,17 +115,16 @@ proc handleReserve(r: Relay, conn: Connection) {.async, gcsafe.} =
     trace "Too many reservations", pid = conn.peerId
     await sendHopStatus(conn, ReservationRefused)
     return
+  trace "reserving relay slot for", pid = conn.peerId
   let
     pid = conn.peerId
     expire = now().utc + r.reservationTTL
-    msg = r.createReserveResponse(pid, expire)
+    msg = r.createReserveResponse(pid, expire).valueOr:
+      trace "error signing the voucher", pid
+      return
 
-  trace "reserving relay slot for", pid
-  if msg.isErr():
-    trace "error signing the voucher", error = error(msg), pid
-    return
   r.rsvp[pid] = expire
-  await conn.writeLp(encode(msg.get()).buffer)
+  await conn.writeLp(encode(msg).buffer)
 
 proc handleConnect(r: Relay,
                    connSrc: Connection,
@@ -134,13 +133,12 @@ proc handleConnect(r: Relay,
     trace "connection attempt over relay connection"
     await sendHopStatus(connSrc, PermissionDenied)
     return
-  if msg.peer.isNone():
-    await sendHopStatus(connSrc, MalformedMessage)
-    return
-
   let
+    msgPeer = msg.peer.valueOr:
+      await sendHopStatus(connSrc, MalformedMessage)
+      return
     src = connSrc.peerId
-    dst = msg.peer.get().peerId
+    dst = msgPeer.peerId
   if dst notin r.rsvp:
     trace "refusing connection, no reservation", src, dst
     await sendHopStatus(connSrc, NoReservation)
@@ -173,16 +171,17 @@ proc handleConnect(r: Relay,
 
   proc sendStopMsg() {.async.} =
     let stopMsg = StopMessage(msgType: StopMessageType.Connect,
-                            peer: some(Peer(peerId: src, addrs: @[])),
+                            peer: Opt.some(Peer(peerId: src, addrs: @[])),
                             limit: r.limit)
     await connDst.writeLp(encode(stopMsg).buffer)
-    let msg = StopMessage.decode(await connDst.readLp(r.msgSize)).get()
+    let msg = StopMessage.decode(await connDst.readLp(r.msgSize)).valueOr:
+      raise newException(SendStopError, "Malformed message")
     if msg.msgType != StopMessageType.Status:
       raise newException(SendStopError, "Unexpected stop response, not a status message")
     if msg.status.get(UnexpectedMessage) != Ok:
       raise newException(SendStopError, "Relay stop failure")
     await connSrc.writeLp(encode(HopMessage(msgType: HopMessageType.Status,
-                                          status: some(Ok))).buffer)
+                                          status: Opt.some(Ok))).buffer)
   try:
     await sendStopMsg()
   except CancelledError as exc:
@@ -202,12 +201,10 @@ proc handleConnect(r: Relay,
   await bridge(rconnSrc, rconnDst)
 
 proc handleHopStreamV2*(r: Relay, conn: Connection) {.async, gcsafe.} =
-  let msgOpt = HopMessage.decode(await conn.readLp(r.msgSize))
+  let msg = HopMessage.decode(await conn.readLp(r.msgSize)).valueOr:
-  if msgOpt.isNone():
     await sendHopStatus(conn, MalformedMessage)
     return
-  trace "relayv2 handle stream", msg = msgOpt.get()
+  trace "relayv2 handle stream", msg = msg
-  let msg = msgOpt.get()
   case msg.msgType:
   of HopMessageType.Reserve: await r.handleReserve(conn)
   of HopMessageType.Connect: await r.handleConnect(conn, msg)
@@ -225,15 +222,14 @@ proc handleHop*(r: Relay, connSrc: Connection, msg: RelayMessage) {.async, gcsaf
     await sendStatus(connSrc, StatusV1.HopCantSpeakRelay)
     return
 
+  var src, dst: RelayPeer
   proc checkMsg(): Result[RelayMessage, StatusV1] =
-    if msg.srcPeer.isNone:
+    src = msg.srcPeer.valueOr:
       return err(StatusV1.HopSrcMultiaddrInvalid)
-    let src = msg.srcPeer.get()
     if src.peerId != connSrc.peerId:
       return err(StatusV1.HopSrcMultiaddrInvalid)
-    if msg.dstPeer.isNone:
+    dst = msg.dstPeer.valueOr:
       return err(StatusV1.HopDstMultiaddrInvalid)
-    let dst = msg.dstPeer.get()
     if dst.peerId == r.switch.peerInfo.peerId:
       return err(StatusV1.HopCantRelayToSelf)
     if not r.switch.isConnected(dst.peerId):
@@ -245,9 +241,6 @@ proc handleHop*(r: Relay, connSrc: Connection, msg: RelayMessage) {.async, gcsaf
     await sendStatus(connSrc, check.error())
     return
 
-  let
-    src = msg.srcPeer.get()
-    dst = msg.dstPeer.get()
   if r.peerCount[src.peerId] >= r.maxCircuitPerPeer or
      r.peerCount[dst.peerId] >= r.maxCircuitPerPeer:
     trace "refusing connection; too many connection from src or to dst", src, dst
@@ -271,9 +264,9 @@ proc handleHop*(r: Relay, connSrc: Connection, msg: RelayMessage) {.async, gcsaf
     await connDst.close()
 
   let msgToSend = RelayMessage(
-    msgType: some(RelayType.Stop),
+    msgType: Opt.some(RelayType.Stop),
-    srcPeer: some(src),
+    srcPeer: Opt.some(src),
-    dstPeer: some(dst))
+    dstPeer: Opt.some(dst))
 
   let msgRcvFromDstOpt = try:
     await connDst.writeLp(encode(msgToSend).buffer)
@@ -285,12 +278,11 @@ proc handleHop*(r: Relay, connSrc: Connection, msg: RelayMessage) {.async, gcsaf
     await sendStatus(connSrc, StatusV1.HopCantOpenDstStream)
     return
 
-  if msgRcvFromDstOpt.isNone:
+  let msgRcvFromDst = msgRcvFromDstOpt.valueOr:
     trace "error reading stop response", msg = msgRcvFromDstOpt
     await sendStatus(connSrc, StatusV1.HopCantOpenDstStream)
     return
 
-  let msgRcvFromDst = msgRcvFromDstOpt.get()
   if msgRcvFromDst.msgType.get(RelayType.Stop) != RelayType.Status or
      msgRcvFromDst.status.get(StatusV1.StopRelayRefused) != StatusV1.Success:
     trace "unexcepted relay stop response", msgRcvFromDst
@@ -302,13 +294,16 @@ proc handleHop*(r: Relay, connSrc: Connection, msg: RelayMessage) {.async, gcsaf
   await bridge(connSrc, connDst)
 
 proc handleStreamV1(r: Relay, conn: Connection) {.async, gcsafe.} =
-  let msgOpt = RelayMessage.decode(await conn.readLp(r.msgSize))
+  let msg = RelayMessage.decode(await conn.readLp(r.msgSize)).valueOr:
-  if msgOpt.isNone:
     await sendStatus(conn, StatusV1.MalformedMessage)
     return
-  trace "relay handle stream", msg = msgOpt.get()
+  trace "relay handle stream", msg
-  let msg = msgOpt.get()
+
-  case msg.msgType.get:
+  let typ = msg.msgType.valueOr:
+    trace "Message type not set"
+    await sendStatus(conn, StatusV1.MalformedMessage)
+    return
+  case typ:
     of RelayType.Hop: await r.handleHop(conn, msg)
     of RelayType.Stop: await sendStatus(conn, StatusV1.StopRelayRefused)
     of RelayType.CanHop: await sendStatus(conn, StatusV1.Success)

libp2p/protocols/connectivity/relay/rtransport.nim

@@ -61,9 +61,9 @@ proc dial*(self: RelayTransport, ma: MultiAddress): Future[Connection] {.async,
   var
     relayPeerId: PeerId
     dstPeerId: PeerId
-  if not relayPeerId.init(($(sma[^3].get())).split('/')[2]):
+  if not relayPeerId.init(($(sma[^3].tryGet())).split('/')[2]):
     raise newException(RelayV2DialError, "Relay doesn't exist")
-  if not dstPeerId.init(($(sma[^1].get())).split('/')[2]):
+  if not dstPeerId.init(($(sma[^1].tryGet())).split('/')[2]):
     raise newException(RelayV2DialError, "Destination doesn't exist")
   trace "Dial", relayPeerId, dstPeerId
 
@@ -91,13 +91,17 @@ method dial*(
   hostname: string,
   ma: MultiAddress,
   peerId: Opt[PeerId] = Opt.none(PeerId)): Future[Connection] {.async, gcsafe.} =
-  let address = MultiAddress.init($ma & "/p2p/" & $peerId.get()).tryGet()
+  peerId.withValue(pid):
-  result = await self.dial(address)
+    let address = MultiAddress.init($ma & "/p2p/" & $pid).tryGet()
+    result = await self.dial(address)
 
-method handles*(self: RelayTransport, ma: MultiAddress): bool {.gcsafe} =
+method handles*(self: RelayTransport, ma: MultiAddress): bool {.gcsafe.} =
-  if ma.protocols.isOk():
+  try:
-    let sma = toSeq(ma.items())
+    if ma.protocols.isOk():
-    result = sma.len >= 2 and CircuitRelay.match(sma[^1].get())
+      let sma = toSeq(ma.items())
+      result = sma.len >= 2 and CircuitRelay.match(sma[^1].tryGet())
+  except CatchableError as exc:
+    result = false
   trace "Handles return", ma, result
 
 proc new*(T: typedesc[RelayTransport], cl: RelayClient, upgrader: Upgrade): T =

libp2p/protocols/connectivity/relay/utils.nim

@@ -9,10 +9,7 @@
 
 {.push raises: [].}
 
-import options
-
 import chronos, chronicles
-
 import ./messages,
        ../../../stream/connection
 
@@ -27,21 +24,21 @@ const
 proc sendStatus*(conn: Connection, code: StatusV1) {.async, gcsafe.} =
   trace "send relay/v1 status", status = $code & "(" & $ord(code) & ")"
   let
-    msg = RelayMessage(msgType: some(RelayType.Status), status: some(code))
+    msg = RelayMessage(msgType: Opt.some(RelayType.Status), status: Opt.some(code))
     pb = encode(msg)
   await conn.writeLp(pb.buffer)
 
 proc sendHopStatus*(conn: Connection, code: StatusV2) {.async, gcsafe.} =
   trace "send hop relay/v2 status", status = $code & "(" & $ord(code) & ")"
   let
-    msg = HopMessage(msgType: HopMessageType.Status, status: some(code))
+    msg = HopMessage(msgType: HopMessageType.Status, status: Opt.some(code))
     pb = encode(msg)
   await conn.writeLp(pb.buffer)
 
 proc sendStopStatus*(conn: Connection, code: StatusV2) {.async.} =
   trace "send stop relay/v2 status", status = $code & " (" & $ord(code) & ")"
   let
-    msg = StopMessage(msgType: StopMessageType.Status, status: some(code))
+    msg = StopMessage(msgType: StopMessageType.Status, status: Opt.some(code))
     pb = encode(msg)
   await conn.writeLp(pb.buffer)
 

libp2p/protocols/identify.nim

@@ -71,9 +71,7 @@ chronicles.expandIt(IdentifyInfo):
   pubkey = ($it.pubkey).shortLog
   addresses = it.addrs.map(x => $x).join(",")
   protocols = it.protos.map(x => $x).join(",")
-  observable_address =
+  observable_address = $it.observedAddr
-    if it.observedAddr.isSome(): $it.observedAddr.get()
-    else: "None"
   proto_version = it.protoVersion.get("None")
   agent_version = it.agentVersion.get("None")
   signedPeerRecord =
@@ -88,13 +86,13 @@ proc encodeMsg(peerInfo: PeerInfo, observedAddr: Opt[MultiAddress], sendSpr: boo
 
   let pkey = peerInfo.publicKey
 
-  result.write(1, pkey.getBytes().get())
+  result.write(1, pkey.getBytes().expect("valid key"))
   for ma in peerInfo.addrs:
     result.write(2, ma.data.buffer)
   for proto in peerInfo.protocols:
     result.write(3, proto)
-  if observedAddr.isSome:
+  observedAddr.withValue(observed):
-    result.write(4, observedAddr.get().data.buffer)
+    result.write(4, observed.data.buffer)
   let protoVersion = ProtoVersion
   result.write(5, protoVersion)
   let agentVersion = if peerInfo.agentVersion.len <= 0:
@@ -106,13 +104,12 @@ proc encodeMsg(peerInfo: PeerInfo, observedAddr: Opt[MultiAddress], sendSpr: boo
   ## Optionally populate signedPeerRecord field.
   ## See https://github.com/libp2p/go-libp2p/blob/ddf96ce1cfa9e19564feb9bd3e8269958bbc0aba/p2p/protocol/identify/pb/identify.proto for reference.
   if sendSpr:
-    let sprBuff = peerInfo.signedPeerRecord.envelope.encode()
+    peerInfo.signedPeerRecord.envelope.encode().toOpt().withValue(sprBuff):
-    if sprBuff.isOk():
+      result.write(8, sprBuff)
-      result.write(8, sprBuff.get())
 
   result.finish()
 
-proc decodeMsg*(buf: seq[byte]): Option[IdentifyInfo] =
+proc decodeMsg*(buf: seq[byte]): Opt[IdentifyInfo] =
   var
     iinfo: IdentifyInfo
     pubkey: PublicKey
@@ -122,37 +119,22 @@ proc decodeMsg*(buf: seq[byte]): Option[IdentifyInfo] =
     signedPeerRecord: SignedPeerRecord
 
   var pb = initProtoBuffer(buf)
+  if ? pb.getField(1, pubkey).toOpt():
+    iinfo.pubkey = some(pubkey)
+    if ? pb.getField(8, signedPeerRecord).toOpt() and
+      pubkey == signedPeerRecord.envelope.publicKey:
+      iinfo.signedPeerRecord = some(signedPeerRecord.envelope)
+  discard ? pb.getRepeatedField(2, iinfo.addrs).toOpt()
+  discard ? pb.getRepeatedField(3, iinfo.protos).toOpt()
+  if ? pb.getField(4, oaddr).toOpt():
+    iinfo.observedAddr = some(oaddr)
+  if ? pb.getField(5, protoVersion).toOpt():
+    iinfo.protoVersion = some(protoVersion)
+  if ? pb.getField(6, agentVersion).toOpt():
+    iinfo.agentVersion = some(agentVersion)
 
-  let r1 = pb.getField(1, pubkey)
+  debug "decodeMsg: decoded identify", iinfo
-  let r2 = pb.getRepeatedField(2, iinfo.addrs)
+  Opt.some(iinfo)
-  let r3 = pb.getRepeatedField(3, iinfo.protos)
-  let r4 = pb.getField(4, oaddr)
-  let r5 = pb.getField(5, protoVersion)
-  let r6 = pb.getField(6, agentVersion)
-
-  let r8 = pb.getField(8, signedPeerRecord)
-
-  let res = r1.isOk() and r2.isOk() and r3.isOk() and
-            r4.isOk() and r5.isOk() and r6.isOk() and
-            r8.isOk()
-
-  if res:
-    if r1.get():
-      iinfo.pubkey = some(pubkey)
-    if r4.get():
-      iinfo.observedAddr = some(oaddr)
-    if r5.get():
-      iinfo.protoVersion = some(protoVersion)
-    if r6.get():
-      iinfo.agentVersion = some(agentVersion)
-    if r8.get() and r1.get():
-      if iinfo.pubkey.get() == signedPeerRecord.envelope.publicKey:
-        iinfo.signedPeerRecord = some(signedPeerRecord.envelope)
-    debug "decodeMsg: decoded identify", iinfo
-    some(iinfo)
-  else:
-    trace "decodeMsg: failed to decode received message"
-    none[IdentifyInfo]()
 
 proc new*(
   T: typedesc[Identify],
@@ -193,26 +175,19 @@ proc identify*(self: Identify,
     trace "identify: Empty message received!", conn
     raise newException(IdentityInvalidMsgError, "Empty message received!")
 
-  let infoOpt = decodeMsg(message)
+  var info = decodeMsg(message).valueOr: raise newException(IdentityInvalidMsgError, "Incorrect message received!")
-  if infoOpt.isNone():
+  let
-    raise newException(IdentityInvalidMsgError, "Incorrect message received!")
+    pubkey = info.pubkey.valueOr: raise newException(IdentityInvalidMsgError, "No pubkey in identify")
+    peer = PeerId.init(pubkey).valueOr: raise newException(IdentityInvalidMsgError, $error)
 
-  var info = infoOpt.get()
+  if peer != remotePeerId:
-  if info.pubkey.isNone():
-    raise newException(IdentityInvalidMsgError, "No pubkey in identify")
-
-  let peer = PeerId.init(info.pubkey.get())
-  if peer.isErr:
-    raise newException(IdentityInvalidMsgError, $peer.error)
-
-  if peer.get() != remotePeerId:
     trace "Peer ids don't match", remote = peer, local = remotePeerId
     raise newException(IdentityNoMatchError, "Peer ids don't match")
-  info.peerId = peer.get()
+  info.peerId = peer
 
-  if info.observedAddr.isSome:
+  info.observedAddr.withValue(observed):
-    if not self.observedAddrManager.addObservation(info.observedAddr.get()):
+    if not self.observedAddrManager.addObservation(observed):
-      debug "Observed address is not valid", observedAddr = info.observedAddr.get()
+      debug "Observed address is not valid", observedAddr = observed
   return info
 
 proc new*(T: typedesc[IdentifyPush], handler: IdentifyPushHandler = nil): T {.public.} =
@@ -228,21 +203,18 @@ proc init*(p: IdentifyPush) =
     try:
       var message = await conn.readLp(64*1024)
 
-      let infoOpt = decodeMsg(message)
+      var identInfo = decodeMsg(message).valueOr:
-      if infoOpt.isNone():
         raise newException(IdentityInvalidMsgError, "Incorrect message received!")
 
-      var indentInfo = infoOpt.get()
+      identInfo.pubkey.withValue(pubkey):
-
+        let receivedPeerId = PeerId.init(pubkey).tryGet()
-      if indentInfo.pubkey.isSome:
-        let receivedPeerId = PeerId.init(indentInfo.pubkey.get()).tryGet()
         if receivedPeerId != conn.peerId:
           raise newException(IdentityNoMatchError, "Peer ids don't match")
-        indentInfo.peerId = receivedPeerId
+        identInfo.peerId = receivedPeerId
 
       trace "triggering peer event", peerInfo = conn.peerId
       if not isNil(p.identifyHandler):
-        await p.identifyHandler(conn.peerId, indentInfo)
+        await p.identifyHandler(conn.peerId, identInfo)
     except CancelledError as exc:
       raise exc
     except CatchableError as exc:

libp2p/protocols/pubsub/gossipsub.nim

@@ -185,11 +185,11 @@ method unsubscribePeer*(g: GossipSub, peer: PeerId) =
     return
 
   # remove from peer IPs collection too
-  if pubSubPeer.address.isSome():
+  pubSubPeer.address.withValue(address):
-    g.peersInIP.withValue(pubSubPeer.address.get(), s):
+    g.peersInIP.withValue(address, s):
       s[].excl(pubSubPeer.peerId)
       if s[].len == 0:
-        g.peersInIP.del(pubSubPeer.address.get())
+        g.peersInIP.del(address)
 
   for t in toSeq(g.mesh.keys):
     trace "pruning unsubscribing peer", pubSubPeer, score = pubSubPeer.score

libp2p/protocols/pubsub/gossipsub/behavior.nim

@@ -49,9 +49,7 @@ proc pruned*(g: GossipSub,
              backoff = none(Duration)) {.raises: [].} =
   if setBackoff:
     let
-      backoffDuration =
+      backoffDuration = backoff.get(g.parameters.pruneBackoff)
-        if isSome(backoff): backoff.get()
-        else: g.parameters.pruneBackoff
       backoffMoment = Moment.fromNow(backoffDuration)
 
     g.backingOff
@@ -191,20 +189,15 @@ proc handleGraft*(g: GossipSub,
 proc getPeers(prune: ControlPrune, peer: PubSubPeer): seq[(PeerId, Option[PeerRecord])] =
   var routingRecords: seq[(PeerId, Option[PeerRecord])]
   for record in prune.peers:
-    let peerRecord =
+    var peerRecord = none(PeerRecord)
-      if record.signedPeerRecord.len == 0:
+    if record.signedPeerRecord.len > 0:
-        none(PeerRecord)
+      SignedPeerRecord.decode(record.signedPeerRecord).toOpt().withValue(spr):
-      else:
+        if record.peerId != spr.data.peerId:
-        let signedRecord = SignedPeerRecord.decode(record.signedPeerRecord)
+          trace "peer sent envelope with wrong public key", peer
-        if signedRecord.isErr:
-          trace "peer sent invalid SPR", peer, error=signedRecord.error
-          none(PeerRecord)
         else:
-          if record.peerId != signedRecord.get().data.peerId:
+          peerRecord = some(spr.data)
-            trace "peer sent envelope with wrong public key", peer
+      else:
-            none(PeerRecord)
+        trace "peer sent invalid SPR", peer
-          else:
-            some(signedRecord.get().data)
 
     routingRecords.add((record.peerId, peerRecord))
 
@@ -296,12 +289,11 @@ proc handleIWant*(g: GossipSub,
             libp2p_gossipsub_received_iwants.inc(1, labelValues=["skipped"])
             return messages
           continue
-        let msg = g.mcache.get(mid)
+        let msg = g.mcache.get(mid).valueOr:
-        if msg.isSome:
-          libp2p_gossipsub_received_iwants.inc(1, labelValues=["correct"])
-          messages.add(msg.get())
-        else:
           libp2p_gossipsub_received_iwants.inc(1, labelValues=["unknown"])
+          continue
+        libp2p_gossipsub_received_iwants.inc(1, labelValues=["correct"])
+        messages.add(msg)
   return messages
 
 proc commitMetrics(metrics: var MeshMetrics) {.raises: [].} =

libp2p/protocols/pubsub/gossipsub/scoring.nim

@@ -9,7 +9,7 @@
 
 {.push raises: [].}
 
-import std/[tables, sets, options]
+import std/[tables, sets]
 import chronos, chronicles, metrics
 import "."/[types]
 import ".."/[pubsubpeer]
@@ -71,20 +71,17 @@ func `/`(a, b: Duration): float64 =
 func byScore*(x,y: PubSubPeer): int = system.cmp(x.score, y.score)
 
 proc colocationFactor(g: GossipSub, peer: PubSubPeer): float64 =
-  if peer.address.isNone():
+  let address = peer.address.valueOr: return 0.0
-    0.0
+
+  g.peersInIP.mgetOrPut(address, initHashSet[PeerId]()).incl(peer.peerId)
+  let
+    ipPeers = g.peersInIP.getOrDefault(address).len().float64
+  if ipPeers > g.parameters.ipColocationFactorThreshold:
+    trace "colocationFactor over threshold", peer, address, ipPeers
+    let over = ipPeers - g.parameters.ipColocationFactorThreshold
+    over * over
   else:
-    let
+    0.0
-      address = peer.address.get()
-    g.peersInIP.mgetOrPut(address, initHashSet[PeerId]()).incl(peer.peerId)
-    let
-      ipPeers = g.peersInIP.getOrDefault(address).len().float64
-    if ipPeers > g.parameters.ipColocationFactorThreshold:
-      trace "colocationFactor over threshold", peer, address, ipPeers
-      let over = ipPeers - g.parameters.ipColocationFactorThreshold
-      over * over
-    else:
-      0.0
 
 {.pop.}
 

libp2p/protocols/pubsub/pubsub.nim

@@ -170,10 +170,9 @@ proc broadcast*(
       else:
         libp2p_pubsub_broadcast_messages.inc(npeers, labelValues = ["generic"])
 
-  if msg.control.isSome():
+  msg.control.withValue(control):
-    libp2p_pubsub_broadcast_iwant.inc(npeers * msg.control.get().iwant.len.int64)
+    libp2p_pubsub_broadcast_iwant.inc(npeers * control.iwant.len.int64)
 
-    let control = msg.control.get()
     for ihave in control.ihave:
       if p.knownTopics.contains(ihave.topicId):
         libp2p_pubsub_broadcast_ihave.inc(npeers, labelValues = [ihave.topicId])
@@ -244,9 +243,8 @@ proc updateMetrics*(p: PubSub, rpcMsg: RPCMsg) =
       else:
         libp2p_pubsub_received_messages.inc(labelValues = ["generic"])
 
-  if rpcMsg.control.isSome():
+  rpcMsg.control.withValue(control):
-    libp2p_pubsub_received_iwant.inc(rpcMsg.control.get().iwant.len.int64)
+    libp2p_pubsub_received_iwant.inc(control.iwant.len.int64)
-    template control: untyped = rpcMsg.control.unsafeGet()
     for ihave in control.ihave:
       if p.knownTopics.contains(ihave.topicId):
         libp2p_pubsub_received_ihave.inc(labelValues = [ihave.topicId])

libp2p/protocols/pubsub/pubsubpeer.nim

@@ -133,28 +133,26 @@ proc handle*(p: PubSubPeer, conn: Connection) {.async.} =
           conn, peer = p, closed = conn.closed,
           data = data.shortLog
 
-        var rmsg = decodeRpcMsg(data)
+        var rmsg = decodeRpcMsg(data).valueOr:
-        data = newSeq[byte]() # Release memory
+          debug "failed to decode msg from peer",
-
-        if rmsg.isErr():
-          notice "failed to decode msg from peer",
             conn, peer = p, closed = conn.closed,
-            err = rmsg.error()
+            err = error
           break
+        data = newSeq[byte]() # Release memory
 
         trace "decoded msg from peer",
           conn, peer = p, closed = conn.closed,
-          msg = rmsg.get().shortLog
+          msg = rmsg.shortLog
         # trigger hooks
-        p.recvObservers(rmsg.get())
+        p.recvObservers(rmsg)
 
         when defined(libp2p_expensive_metrics):
-          for m in rmsg.get().messages:
+          for m in rmsg.messages:
             for t in m.topicIDs:
               # metrics
               libp2p_pubsub_received_messages.inc(labelValues = [$p.peerId, t])
 
-        await p.handler(p, rmsg.get())
+        await p.handler(p, rmsg)
     finally:
       await conn.close()
   except CancelledError:

libp2p/protocols/pubsub/rpc/message.nim

@@ -66,18 +66,17 @@ proc init*(
   var msg = Message(data: data, topicIDs: @[topic])
 
   # order matters, we want to include seqno in the signature
-  if seqno.isSome:
+  seqno.withValue(seqn):
-    msg.seqno = @(seqno.get().toBytesBE())
+    msg.seqno = @(seqn.toBytesBE())
 
-  if peer.isSome:
+  peer.withValue(peer):
-    let peer = peer.get()
     msg.fromPeer = peer.peerId
     if sign:
       msg.signature = sign(msg, peer.privateKey).expect("Couldn't sign message!")
       msg.key = peer.privateKey.getPublicKey().expect("Invalid private key!")
         .getBytes().expect("Couldn't get public key bytes!")
-  elif sign:
+  else:
-    raise (ref LPError)(msg: "Cannot sign message without peer info")
+    if sign: raise (ref LPError)(msg: "Cannot sign message without peer info")
 
   msg
 
@@ -91,6 +90,6 @@ proc init*(
   var msg = Message(data: data, topicIDs: @[topic])
   msg.fromPeer = peerId
 
-  if seqno.isSome:
+  seqno.withValue(seqn):
-    msg.seqno = @(seqno.get().toBytesBE())
+    msg.seqno = @(seqn.toBytesBE())
   msg

libp2p/protocols/pubsub/rpc/messages.nim

@@ -110,15 +110,8 @@ func shortLog*(msg: Message): auto =
   )
 
 func shortLog*(m: RPCMsg): auto =
-  if m.control.isSome:
+  (
-    (
+    subscriptions: m.subscriptions,
-      subscriptions: m.subscriptions,
+    messages: mapIt(m.messages, it.shortLog),
-      messages: mapIt(m.messages, it.shortLog),
+    control: m.control.get(ControlMessage()).shortLog
-      control: m.control.get().shortLog
+  )
-    )
-  else:
-    (
-      subscriptions: m.subscriptions,
-      messages: mapIt(m.messages, it.shortLog),
-      control: ControlMessage().shortLog
-    )

libp2p/protocols/pubsub/rpc/protobuf.nim

@@ -314,8 +314,8 @@ proc encodeRpcMsg*(msg: RPCMsg, anonymize: bool): seq[byte] =
     pb.write(1, item)
   for item in msg.messages:
     pb.write(2, item, anonymize)
-  if msg.control.isSome():
+  msg.control.withValue(control):
-    pb.write(3, msg.control.get())
+    pb.write(3, control)
   # nim-libp2p extension, using fields which are unlikely to be used
   # by other extensions
   if msg.ping.len > 0:
@@ -329,10 +329,10 @@ proc encodeRpcMsg*(msg: RPCMsg, anonymize: bool): seq[byte] =
 proc decodeRpcMsg*(msg: seq[byte]): ProtoResult[RPCMsg] {.inline.} =
   trace "decodeRpcMsg: decoding message", msg = msg.shortLog()
   var pb = initProtoBuffer(msg, maxSize = uint.high)
-  var rpcMsg = ok(RPCMsg())
+  var rpcMsg = RPCMsg()
-  assign(rpcMsg.get().messages, ? pb.decodeMessages())
+  assign(rpcMsg.messages, ? pb.decodeMessages())
-  assign(rpcMsg.get().subscriptions, ? pb.decodeSubscriptions())
+  assign(rpcMsg.subscriptions, ? pb.decodeSubscriptions())
-  assign(rpcMsg.get().control, ? pb.decodeControl())
+  assign(rpcMsg.control, ? pb.decodeControl())
-  discard ? pb.getField(60, rpcMsg.get().ping)
+  discard ? pb.getField(60, rpcMsg.ping)
-  discard ? pb.getField(61, rpcMsg.get().pong)
+  discard ? pb.getField(61, rpcMsg.pong)
-  rpcMsg
+  ok(rpcMsg)

libp2p/protocols/pubsub/timedcache.nim

@@ -13,6 +13,8 @@ import std/[tables]
 
 import chronos/timer, stew/results
 
+import ../../utility
+
 const Timeout* = 10.seconds # default timeout in ms
 
 type
@@ -55,9 +57,9 @@ func put*[K](t: var TimedCache[K], k: K, now = Moment.now()): bool =
 
   var previous = t.del(k) # Refresh existing item
 
-  let addedAt =
+  var addedAt = now
-    if previous.isSome: previous.get().addedAt
+  previous.withValue(previous):
-    else: now
+    addedAt = previous.addedAt
 
   let node = TimedEntry[K](key: k, addedAt: addedAt, expiresAt: now + t.timeout)
 

libp2p/protocols/rendezvous.nim

@@ -9,12 +9,12 @@
 
 {.push raises: [].}
 
-import tables, sequtils, sugar, sets, options
+import tables, sequtils, sugar, sets
 import metrics except collect
 import chronos,
        chronicles,
        bearssl/rand,
-       stew/[byteutils, objects]
+       stew/[byteutils, objects, results]
 import ./protocol,
        ../switch,
        ../routing_record,
@@ -68,34 +68,34 @@ type
   Register = object
     ns : string
     signedPeerRecord: seq[byte]
-    ttl: Option[uint64] # in seconds
+    ttl: Opt[uint64] # in seconds
 
   RegisterResponse = object
     status: ResponseStatus
-    text: Option[string]
+    text: Opt[string]
-    ttl: Option[uint64] # in seconds
+    ttl: Opt[uint64] # in seconds
 
   Unregister = object
     ns: string
 
   Discover = object
     ns: string
-    limit: Option[uint64]
+    limit: Opt[uint64]
-    cookie: Option[seq[byte]]
+    cookie: Opt[seq[byte]]
 
   DiscoverResponse = object
     registrations: seq[Register]
-    cookie: Option[seq[byte]]
+    cookie: Opt[seq[byte]]
     status: ResponseStatus
-    text: Option[string]
+    text: Opt[string]
 
   Message = object
     msgType: MessageType
-    register: Option[Register]
+    register: Opt[Register]
-    registerResponse: Option[RegisterResponse]
+    registerResponse: Opt[RegisterResponse]
-    unregister: Option[Unregister]
+    unregister: Opt[Unregister]
-    discover: Option[Discover]
+    discover: Opt[Discover]
-    discoverResponse: Option[DiscoverResponse]
+    discoverResponse: Opt[DiscoverResponse]
 
 proc encode(c: Cookie): ProtoBuffer =
   result = initProtoBuffer()
@@ -107,17 +107,17 @@ proc encode(r: Register): ProtoBuffer =
   result = initProtoBuffer()
   result.write(1, r.ns)
   result.write(2, r.signedPeerRecord)
-  if r.ttl.isSome():
+  r.ttl.withValue(ttl):
-    result.write(3, r.ttl.get())
+    result.write(3, ttl)
   result.finish()
 
 proc encode(rr: RegisterResponse): ProtoBuffer =
   result = initProtoBuffer()
   result.write(1, rr.status.uint)
-  if rr.text.isSome():
+  rr.text.withValue(text):
-    result.write(2, rr.text.get())
+    result.write(2, text)
-  if rr.ttl.isSome():
+  rr.ttl.withValue(ttl):
-    result.write(3, rr.ttl.get())
+    result.write(3, ttl)
   result.finish()
 
 proc encode(u: Unregister): ProtoBuffer =
@@ -128,48 +128,48 @@ proc encode(u: Unregister): ProtoBuffer =
 proc encode(d: Discover): ProtoBuffer =
   result = initProtoBuffer()
   result.write(1, d.ns)
-  if d.limit.isSome():
+  d.limit.withValue(limit):
-    result.write(2, d.limit.get())
+    result.write(2, limit)
-  if d.cookie.isSome():
+  d.cookie.withValue(cookie):
-    result.write(3, d.cookie.get())
+    result.write(3, cookie)
   result.finish()
 
-proc encode(d: DiscoverResponse): ProtoBuffer =
+proc encode(dr: DiscoverResponse): ProtoBuffer =
   result = initProtoBuffer()
-  for reg in d.registrations:
+  for reg in dr.registrations:
     result.write(1, reg.encode())
-  if d.cookie.isSome():
+  dr.cookie.withValue(cookie):
-    result.write(2, d.cookie.get())
+    result.write(2, cookie)
-  result.write(3, d.status.uint)
+  result.write(3, dr.status.uint)
-  if d.text.isSome():
+  dr.text.withValue(text):
-    result.write(4, d.text.get())
+    result.write(4, text)
   result.finish()
 
 proc encode(msg: Message): ProtoBuffer =
   result = initProtoBuffer()
   result.write(1, msg.msgType.uint)
-  if msg.register.isSome():
+  msg.register.withValue(register):
-    result.write(2, msg.register.get().encode())
+    result.write(2, register.encode())
-  if msg.registerResponse.isSome():
+  msg.registerResponse.withValue(registerResponse):
-    result.write(3, msg.registerResponse.get().encode())
+    result.write(3, registerResponse.encode())
-  if msg.unregister.isSome():
+  msg.unregister.withValue(unregister):
-    result.write(4, msg.unregister.get().encode())
+    result.write(4, unregister.encode())
-  if msg.discover.isSome():
+  msg.discover.withValue(discover):
-    result.write(5, msg.discover.get().encode())
+    result.write(5, discover.encode())
-  if msg.discoverResponse.isSome():
+  msg.discoverResponse.withValue(discoverResponse):
-    result.write(6, msg.discoverResponse.get().encode())
+    result.write(6, discoverResponse.encode())
   result.finish()
 
-proc decode(_: typedesc[Cookie], buf: seq[byte]): Option[Cookie] =
+proc decode(_: typedesc[Cookie], buf: seq[byte]): Opt[Cookie] =
   var c: Cookie
   let
     pb = initProtoBuffer(buf)
     r1 = pb.getRequiredField(1, c.offset)
     r2 = pb.getRequiredField(2, c.ns)
-  if r1.isErr() or r2.isErr(): return none(Cookie)
+  if r1.isErr() or r2.isErr(): return Opt.none(Cookie)
-  some(c)
+  Opt.some(c)
 
-proc decode(_: typedesc[Register], buf: seq[byte]): Option[Register] =
+proc decode(_: typedesc[Register], buf: seq[byte]): Opt[Register] =
   var
     r: Register
     ttl: uint64
@@ -178,11 +178,11 @@ proc decode(_: typedesc[Register], buf: seq[byte]): Option[Register] =
     r1 = pb.getRequiredField(1, r.ns)
     r2 = pb.getRequiredField(2, r.signedPeerRecord)
     r3 = pb.getField(3, ttl)
-  if r1.isErr() or r2.isErr() or r3.isErr(): return none(Register)
+  if r1.isErr() or r2.isErr() or r3.isErr(): return Opt.none(Register)
-  if r3.get(): r.ttl = some(ttl)
+  if r3.get(false): r.ttl = Opt.some(ttl)
-  some(r)
+  Opt.some(r)
 
-proc decode(_: typedesc[RegisterResponse], buf: seq[byte]): Option[RegisterResponse] =
+proc decode(_: typedesc[RegisterResponse], buf: seq[byte]): Opt[RegisterResponse] =
   var
     rr: RegisterResponse
     statusOrd: uint
@@ -194,20 +194,20 @@ proc decode(_: typedesc[RegisterResponse], buf: seq[byte]): Option[RegisterRespo
     r2 = pb.getField(2, text)
     r3 = pb.getField(3, ttl)
   if r1.isErr() or r2.isErr() or r3.isErr() or
-     not checkedEnumAssign(rr.status, statusOrd): return none(RegisterResponse)
+     not checkedEnumAssign(rr.status, statusOrd): return Opt.none(RegisterResponse)
-  if r2.get(): rr.text = some(text)
+  if r2.get(false): rr.text = Opt.some(text)
-  if r3.get(): rr.ttl = some(ttl)
+  if r3.get(false): rr.ttl = Opt.some(ttl)
-  some(rr)
+  Opt.some(rr)
 
-proc decode(_: typedesc[Unregister], buf: seq[byte]): Option[Unregister] =
+proc decode(_: typedesc[Unregister], buf: seq[byte]): Opt[Unregister] =
   var u: Unregister
   let
     pb = initProtoBuffer(buf)
     r1 = pb.getRequiredField(1, u.ns)
-  if r1.isErr(): return none(Unregister)
+  if r1.isErr(): return Opt.none(Unregister)
-  some(u)
+  Opt.some(u)
 
-proc decode(_: typedesc[Discover], buf: seq[byte]): Option[Discover] =
+proc decode(_: typedesc[Discover], buf: seq[byte]): Opt[Discover] =
   var
     d: Discover
     limit: uint64
@@ -217,12 +217,12 @@ proc decode(_: typedesc[Discover], buf: seq[byte]): Option[Discover] =
     r1 = pb.getRequiredField(1, d.ns)
     r2 = pb.getField(2, limit)
     r3 = pb.getField(3, cookie)
-  if r1.isErr() or r2.isErr() or r3.isErr: return none(Discover)
+  if r1.isErr() or r2.isErr() or r3.isErr: return Opt.none(Discover)
-  if r2.get(): d.limit = some(limit)
+  if r2.get(false): d.limit = Opt.some(limit)
-  if r3.get(): d.cookie = some(cookie)
+  if r3.get(false): d.cookie = Opt.some(cookie)
-  some(d)
+  Opt.some(d)
 
-proc decode(_: typedesc[DiscoverResponse], buf: seq[byte]): Option[DiscoverResponse] =
+proc decode(_: typedesc[DiscoverResponse], buf: seq[byte]): Opt[DiscoverResponse] =
   var
     dr: DiscoverResponse
     registrations: seq[seq[byte]]
@@ -236,48 +236,47 @@ proc decode(_: typedesc[DiscoverResponse], buf: seq[byte]): Option[DiscoverRespo
     r3 = pb.getRequiredField(3, statusOrd)
     r4 = pb.getField(4, text)
   if r1.isErr() or r2.isErr() or r3.isErr or r4.isErr() or
-     not checkedEnumAssign(dr.status, statusOrd): return none(DiscoverResponse)
+     not checkedEnumAssign(dr.status, statusOrd): return Opt.none(DiscoverResponse)
   for reg in registrations:
     var r: Register
-    let regOpt = Register.decode(reg)
+    let regOpt = Register.decode(reg).valueOr:
-    if regOpt.isNone(): return none(DiscoverResponse)
+      return
-    dr.registrations.add(regOpt.get())
+    dr.registrations.add(regOpt)
-  if r2.get(): dr.cookie = some(cookie)
+  if r2.get(false): dr.cookie = Opt.some(cookie)
-  if r4.get(): dr.text = some(text)
+  if r4.get(false): dr.text = Opt.some(text)
-  some(dr)
+  Opt.some(dr)
 
-proc decode(_: typedesc[Message], buf: seq[byte]): Option[Message] =
+proc decode(_: typedesc[Message], buf: seq[byte]): Opt[Message] =
   var
     msg: Message
     statusOrd: uint
     pbr, pbrr, pbu, pbd, pbdr: ProtoBuffer
-  let
+  let pb = initProtoBuffer(buf)
-    pb = initProtoBuffer(buf)
+
-    r1 = pb.getRequiredField(1, statusOrd)
+  ? pb.getRequiredField(1, statusOrd).toOpt
-    r2 = pb.getField(2, pbr)
+  if not checkedEnumAssign(msg.msgType, statusOrd): return Opt.none(Message)
-    r3 = pb.getField(3, pbrr)
+
-    r4 = pb.getField(4, pbu)
+  if ? pb.getField(2, pbr).optValue:
-    r5 = pb.getField(5, pbd)
-    r6 = pb.getField(6, pbdr)
-  if r1.isErr() or r2.isErr() or r3.isErr() or
-     r4.isErr() or r5.isErr() or r6.isErr() or
-     not checkedEnumAssign(msg.msgType, statusOrd): return none(Message)
-  if r2.get():
     msg.register = Register.decode(pbr.buffer)
-    if msg.register.isNone(): return none(Message)
+    if msg.register.isNone(): return Opt.none(Message)
-  if r3.get():
+
+  if ? pb.getField(3, pbrr).optValue:
     msg.registerResponse = RegisterResponse.decode(pbrr.buffer)
-    if msg.registerResponse.isNone(): return none(Message)
+    if msg.registerResponse.isNone(): return Opt.none(Message)
-  if r4.get():
+
+  if ? pb.getField(4, pbu).optValue:
     msg.unregister = Unregister.decode(pbu.buffer)
-    if msg.unregister.isNone(): return none(Message)
+    if msg.unregister.isNone(): return Opt.none(Message)
-  if r5.get():
+
+  if ? pb.getField(5, pbd).optValue:
     msg.discover = Discover.decode(pbd.buffer)
-    if msg.discover.isNone(): return none(Message)
+    if msg.discover.isNone(): return Opt.none(Message)
-  if r6.get():
+
+  if ? pb.getField(6, pbdr).optValue:
     msg.discoverResponse = DiscoverResponse.decode(pbdr.buffer)
-    if msg.discoverResponse.isNone(): return none(Message)
+    if msg.discoverResponse.isNone(): return Opt.none(Message)
-  some(msg)
+
+  Opt.some(msg)
 
 
 type
@@ -317,7 +316,7 @@ proc sendRegisterResponse(conn: Connection,
                           ttl: uint64) {.async.} =
   let msg = encode(Message(
         msgType: MessageType.RegisterResponse,
-        registerResponse: some(RegisterResponse(status: Ok, ttl: some(ttl)))))
+        registerResponse: Opt.some(RegisterResponse(status: Ok, ttl: Opt.some(ttl)))))
   await conn.writeLp(msg.buffer)
 
 proc sendRegisterResponseError(conn: Connection,
@@ -325,7 +324,7 @@ proc sendRegisterResponseError(conn: Connection,
                                text: string = "") {.async.} =
   let msg = encode(Message(
         msgType: MessageType.RegisterResponse,
-        registerResponse: some(RegisterResponse(status: status, text: some(text)))))
+        registerResponse: Opt.some(RegisterResponse(status: status, text: Opt.some(text)))))
   await conn.writeLp(msg.buffer)
 
 proc sendDiscoverResponse(conn: Connection,
@@ -333,10 +332,10 @@ proc sendDiscoverResponse(conn: Connection,
                           cookie: Cookie) {.async.} =
   let msg = encode(Message(
         msgType: MessageType.DiscoverResponse,
-        discoverResponse: some(DiscoverResponse(
+        discoverResponse: Opt.some(DiscoverResponse(
             status: Ok,
             registrations: s,
-            cookie: some(cookie.encode().buffer)
+            cookie: Opt.some(cookie.encode().buffer)
           ))
         ))
   await conn.writeLp(msg.buffer)
@@ -346,7 +345,7 @@ proc sendDiscoverResponseError(conn: Connection,
                                text: string = "") {.async.} =
   let msg = encode(Message(
         msgType: MessageType.DiscoverResponse,
-        discoverResponse: some(DiscoverResponse(status: status, text: some(text)))))
+        discoverResponse: Opt.some(DiscoverResponse(status: status, text: Opt.some(text)))))
   await conn.writeLp(msg.buffer)
 
 proc countRegister(rdv: RendezVous, peerId: PeerId): int =
@@ -419,7 +418,7 @@ proc discover(rdv: RendezVous, conn: Connection, d: Discover) {.async.} =
     cookie =
       if d.cookie.isSome():
         try:
-          Cookie.decode(d.cookie.get()).get()
+          Cookie.decode(d.cookie.tryGet()).tryGet()
         except CatchableError:
           await conn.sendDiscoverResponseError(InvalidCookie)
           return
@@ -450,7 +449,7 @@ proc discover(rdv: RendezVous, conn: Connection, d: Discover) {.async.} =
           break
         if reg.expiration < n or index.uint64 <= cookie.offset: continue
         limit.dec()
-        reg.data.ttl = some((reg.expiration - Moment.now()).seconds.uint64)
+        reg.data.ttl = Opt.some((reg.expiration - Moment.now()).seconds.uint64)
         reg.data
   rdv.rng.shuffle(s)
   await conn.sendDiscoverResponse(s, Cookie(offset: offset.uint64, ns: d.ns))
@@ -465,11 +464,10 @@ proc advertisePeer(rdv: RendezVous,
       await conn.writeLp(msg)
       let
         buf = await conn.readLp(4096)
-        msgRecv = Message.decode(buf).get()
+        msgRecv = Message.decode(buf).tryGet()
       if msgRecv.msgType != MessageType.RegisterResponse:
         trace "Unexpected register response", peer, msgType = msgRecv.msgType
-      elif msgRecv.registerResponse.isNone() or
+      elif msgRecv.registerResponse.tryGet().status != ResponseStatus.Ok:
-           msgRecv.registerResponse.get().status != ResponseStatus.Ok:
         trace "Refuse to register", peer, response = msgRecv.registerResponse
     except CatchableError as exc:
       trace "exception in the advertise", error = exc.msg
@@ -481,16 +479,15 @@ proc advertisePeer(rdv: RendezVous,
 proc advertise*(rdv: RendezVous,
                 ns: string,
                 ttl: Duration = MinimumDuration) {.async.} =
-  let sprBuff = rdv.switch.peerInfo.signedPeerRecord.encode()
+  let sprBuff = rdv.switch.peerInfo.signedPeerRecord.encode().valueOr:
-  if sprBuff.isErr():
     raise newException(RendezVousError, "Wrong Signed Peer Record")
   if ns.len notin 1..255:
     raise newException(RendezVousError, "Invalid namespace")
   if ttl notin MinimumDuration..MaximumDuration:
     raise newException(RendezVousError, "Invalid time to live")
   let
-    r = Register(ns: ns, signedPeerRecord: sprBuff.get(), ttl: some(ttl.seconds.uint64))
+    r = Register(ns: ns, signedPeerRecord: sprBuff, ttl: Opt.some(ttl.seconds.uint64))
-    msg = encode(Message(msgType: MessageType.Register, register: some(r)))
+    msg = encode(Message(msgType: MessageType.Register, register: Opt.some(r)))
   rdv.save(ns, rdv.switch.peerInfo.peerId, r)
   let fut = collect(newSeq()):
     for peer in rdv.peers:
@@ -506,7 +503,9 @@ proc requestLocally*(rdv: RendezVous, ns: string): seq[PeerRecord] =
     collect(newSeq()):
       for index in rdv.namespaces[nsSalted]:
         if rdv.registered[index].expiration > n:
-          SignedPeerRecord.decode(rdv.registered[index].data.signedPeerRecord).get().data
+          let res = SignedPeerRecord.decode(rdv.registered[index].data.signedPeerRecord).valueOr:
+            continue
+          res.data
   except KeyError as exc:
     @[]
 
@@ -527,38 +526,42 @@ proc request*(rdv: RendezVous,
   proc requestPeer(peer: PeerId) {.async.} =
     let conn = await rdv.switch.dial(peer, RendezVousCodec)
     defer: await conn.close()
-    d.limit = some(limit)
+    d.limit = Opt.some(limit)
     d.cookie =
       try:
-        some(rdv.cookiesSaved[peer][ns])
+        Opt.some(rdv.cookiesSaved[peer][ns])
       except KeyError as exc:
-        none(seq[byte])
+        Opt.none(seq[byte])
     await conn.writeLp(encode(Message(
       msgType: MessageType.Discover,
-      discover: some(d))).buffer)
+      discover: Opt.some(d))).buffer)
     let
       buf = await conn.readLp(65536)
-      msgRcv = Message.decode(buf).get()
+      msgRcv = Message.decode(buf).valueOr:
-    if msgRcv.msgType != MessageType.DiscoverResponse or
+        debug "Message undecodable"
-       msgRcv.discoverResponse.isNone():
+        return
+    if msgRcv.msgType != MessageType.DiscoverResponse:
       debug "Unexpected discover response", msgType = msgRcv.msgType
       return
-    let resp = msgRcv.discoverResponse.get()
+    let resp = msgRcv.discoverResponse.valueOr:
+      debug "Discover response is empty"
+      return
     if resp.status != ResponseStatus.Ok:
       trace "Cannot discover", ns, status = resp.status, text = resp.text
       return
-    if resp.cookie.isSome() and resp.cookie.get().len < 1000:
+    resp.cookie.withValue(cookie):
-      if rdv.cookiesSaved.hasKeyOrPut(peer, {ns: resp.cookie.get()}.toTable):
+      if  cookie.len() < 1000 and rdv.cookiesSaved.hasKeyOrPut(peer, {ns: cookie}.toTable()):
-        rdv.cookiesSaved[peer][ns] = resp.cookie.get()
+        rdv.cookiesSaved[peer][ns] = cookie
     for r in resp.registrations:
       if limit == 0: return
-      if r.ttl.isNone() or r.ttl.get() > MaximumTTL: continue
+      let ttl = r.ttl.get(MaximumTTL + 1)
-      let sprRes = SignedPeerRecord.decode(r.signedPeerRecord)
+      if ttl > MaximumTTL: continue
-      if sprRes.isErr(): continue
+      let
-      let pr = sprRes.get().data
+        spr = SignedPeerRecord.decode(r.signedPeerRecord).valueOr: continue
+        pr = spr.data
       if s.hasKey(pr.peerId):
         let (prSaved, rSaved) = s[pr.peerId]
-        if (prSaved.seqNo == pr.seqNo and rSaved.ttl.get() < r.ttl.get()) or
+        if (prSaved.seqNo == pr.seqNo and rSaved.ttl.get(MaximumTTL) < ttl) or
           prSaved.seqNo < pr.seqNo:
           s[pr.peerId] = (pr, r)
       else:
@@ -597,7 +600,7 @@ proc unsubscribe*(rdv: RendezVous, ns: string) {.async.} =
   rdv.unsubscribeLocally(ns)
   let msg = encode(Message(
     msgType: MessageType.Unregister,
-    unregister: some(Unregister(ns: ns))))
+    unregister: Opt.some(Unregister(ns: ns))))
 
   proc unsubscribePeer(rdv: RendezVous, peerId: PeerId) {.async.} =
     try:
@@ -635,13 +638,13 @@ proc new*(T: typedesc[RendezVous],
     try:
       let
         buf = await conn.readLp(4096)
-        msg = Message.decode(buf).get()
+        msg = Message.decode(buf).tryGet()
       case msg.msgType:
-        of MessageType.Register: await rdv.register(conn, msg.register.get())
+        of MessageType.Register: await rdv.register(conn, msg.register.tryGet())
         of MessageType.RegisterResponse:
           trace "Got an unexpected Register Response", response = msg.registerResponse
-        of MessageType.Unregister: rdv.unregister(conn, msg.unregister.get())
+        of MessageType.Unregister: rdv.unregister(conn, msg.unregister.tryGet())
-        of MessageType.Discover: await rdv.discover(conn, msg.discover.get())
+        of MessageType.Discover: await rdv.discover(conn, msg.discover.tryGet())
         of MessageType.DiscoverResponse:
           trace "Got an unexpected Discover Response", response = msg.discoverResponse
     except CancelledError as exc:

libp2p/protocols/secure/noise.nim

@@ -554,8 +554,7 @@ method handshake*(p: Noise, conn: Connection, initiator: bool, peerId: Opt[PeerI
 
     trace "Remote peer id", pid = $pid
 
-    if peerId.isSome():
+    peerId.withValue(targetPid):
-      let targetPid = peerId.get()
       if not targetPid.validate():
         raise newException(NoiseHandshakeError, "Failed to validate expected peerId.")
 

libp2p/protocols/secure/secio.nim

@@ -339,8 +339,7 @@ method handshake*(s: Secio, conn: Connection, initiator: bool, peerId: Opt[PeerI
 
   remotePeerId = PeerId.init(remotePubkey).tryGet()
 
-  if peerId.isSome():
+  peerId.withValue(targetPid):
-    let targetPid = peerId.get()
     if not targetPid.validate():
       raise newException(SecioError, "Failed to validate expected peerId.")
 
@@ -436,14 +435,10 @@ proc new*(
   T: typedesc[Secio],
   rng: ref HmacDrbgContext,
   localPrivateKey: PrivateKey): T =
-  let pkRes = localPrivateKey.getPublicKey()
-  if pkRes.isErr:
-    raise newException(Defect, "Invalid private key")
-
   let secio = Secio(
     rng: rng,
     localPrivateKey: localPrivateKey,
-    localPublicKey: pkRes.get(),
+    localPublicKey: localPrivateKey.getPublicKey().expect("Invalid private key"),
   )
   secio.init()
   secio

libp2p/routing_record.nim

@@ -42,14 +42,12 @@ proc decode*(
   ? pb.getRequiredField(2, record.seqNo)
 
   var addressInfos: seq[seq[byte]]
-  let pb3 = ? pb.getRepeatedField(3, addressInfos)
+  if ? pb.getRepeatedField(3, addressInfos):
-
-  if pb3:
     for address in addressInfos:
       var addressInfo = AddressInfo()
       let subProto = initProtoBuffer(address)
       let f = subProto.getField(1, addressInfo.address)
-      if f.isOk() and f.get():
+      if f.get(false):
           record.addresses &= addressInfo
 
     if record.addresses.len == 0:

libp2p/services/hpservice.nim

@@ -45,9 +45,7 @@ proc tryStartingDirectConn(self: HPService, switch: Switch, peerId: PeerId): Fut
   for address in switch.peerStore[AddressBook][peerId]:
     try:
       let isRelayed = address.contains(multiCodec("p2p-circuit"))
-      if isRelayed.isErr() or isRelayed.get():
+      if not isRelayed.get(false) and address.isPublicMA():
-        continue
-      if address.isPublicMA():
         return await tryConnect(address)
     except CatchableError as err:
       debug "Failed to create direct connection.", err = err.msg
@@ -96,7 +94,7 @@ method setup*(self: HPService, switch: Switch): Future[bool] {.async.} =
 
     switch.connManager.addPeerEventHandler(self.newConnectedPeerHandler, PeerEventKind.Joined)
 
-    self.onNewStatusHandler = proc (networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    self.onNewStatusHandler = proc (networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.NotReachable and not self.autoRelayService.isRunning():
         discard await self.autoRelayService.setup(switch)
       elif networkReachability == NetworkReachability.Reachable and self.autoRelayService.isRunning():

libp2p/signed_envelope.nim

@@ -112,19 +112,12 @@ proc getField*(pb: ProtoBuffer, field: int,
   if not(res):
     ok(false)
   else:
-    let env = Envelope.decode(buffer, domain)
+    value = Envelope.decode(buffer, domain).valueOr: return err(ProtoError.IncorrectBlob)
-    if env.isOk():
+    ok(true)
-      value = env.get()
-      ok(true)
-    else:
-      err(ProtoError.IncorrectBlob)
 
 proc write*(pb: var ProtoBuffer, field: int, env: Envelope): Result[void, CryptoError] =
-  let e = env.encode()
+  let e = ? env.encode()
-
+  pb.write(field, e)
-  if e.isErr():
-    return err(e.error)
-  pb.write(field, e.get())
   ok()
 
 type
@@ -142,7 +135,7 @@ proc init*[T](_: typedesc[SignedPayload[T]],
                                  T.payloadType(),
                                  data.encode(),
                                  T.payloadDomain)
-  
+
   ok(SignedPayload[T](data: data, envelope: envelope))
 
 proc getField*[T](pb: ProtoBuffer, field: int,

libp2p/transports/tortransport.nim

@@ -141,7 +141,9 @@ proc parseOnion3(address: MultiAddress): (byte, seq[byte], seq[byte]) {.raises:
     dstPort = address.data.buffer[37..38]
   return (Socks5AddressType.FQDN.byte, dstAddr, dstPort)
 
-proc parseIpTcp(address: MultiAddress): (byte, seq[byte], seq[byte]) {.raises: [LPError, ValueError].} =
+proc parseIpTcp(address: MultiAddress):
+  (byte, seq[byte], seq[byte])
+  {.raises: [LPError, ValueError].} =
   let (codec, atyp) =
     if IPv4Tcp.match(address):
       (multiCodec("ip4"), Socks5AddressType.IPv4.byte)
@@ -150,15 +152,17 @@ proc parseIpTcp(address: MultiAddress): (byte, seq[byte], seq[byte]) {.raises: [
     else:
       raise newException(LPError, fmt"IP address not supported {address}")
   let
-    dstAddr = address[codec].get().protoArgument().get()
+    dstAddr = address[codec].tryGet().protoArgument().tryGet()
-    dstPort = address[multiCodec("tcp")].get().protoArgument().get()
+    dstPort = address[multiCodec("tcp")].tryGet().protoArgument().tryGet()
   (atyp, dstAddr, dstPort)
 
-proc parseDnsTcp(address: MultiAddress): (byte, seq[byte], seq[byte]) =
+proc parseDnsTcp(address: MultiAddress):
+  (byte, seq[byte], seq[byte])
+  {.raises: [LPError, ValueError].} =
   let
-    dnsAddress = address[multiCodec("dns")].get().protoArgument().get()
+    dnsAddress = address[multiCodec("dns")].tryGet().protoArgument().tryGet()
     dstAddr = @(uint8(dnsAddress.len).toBytes()) & dnsAddress
-    dstPort = address[multiCodec("tcp")].get().protoArgument().get()
+    dstPort = address[multiCodec("tcp")].tryGet().protoArgument().tryGet()
   (Socks5AddressType.FQDN.byte, dstAddr, dstPort)
 
 proc dialPeer(
@@ -214,9 +218,9 @@ method start*(
         warn "Invalid address detected, skipping!", address = ma
         continue
 
-    let listenAddress = ma[0..1].get()
+    let listenAddress = ma[0..1].tryGet()
     listenAddrs.add(listenAddress)
-    let onion3 = ma[multiCodec("onion3")].get()
+    let onion3 = ma[multiCodec("onion3")].tryGet()
     onion3Addrs.add(onion3)
 
   if len(listenAddrs) != 0 and len(onion3Addrs) != 0:

libp2p/transports/transport.nim

@@ -99,9 +99,8 @@ method handles*(
 
   # by default we skip circuit addresses to avoid
   # having to repeat the check in every transport
-  if address.protocols.isOk:
+  let protocols = address.protocols.valueOr: return false
-    return address.protocols
+  return protocols
-    .get()
     .filterIt(
       it == multiCodec("p2p-circuit")
     ).len == 0

libp2p/utility.nim

@@ -9,7 +9,10 @@
 
 {.push raises: [].}
 
-import stew/byteutils
+import std/options, std/macros
+import stew/[byteutils, results]
+
+export results
 
 template public* {.pragma.}
 
@@ -50,9 +53,6 @@ when defined(libp2p_agents_metrics):
   import strutils
   export split
 
-  import stew/results
-  export results
-
   proc safeToLowerAscii*(s: string): Result[string, cstring] =
     try:
       ok(s.toLowerAscii())
@@ -83,3 +83,30 @@ template exceptionToAssert*(body: untyped): untyped =
     when defined(nimHasWarnBareExcept):
       {.pop.}
     res
+
+template withValue*[T](self: Opt[T] | Option[T], value, body: untyped): untyped =
+  if self.isSome:
+    let value {.inject.} = self.get()
+    body
+
+macro withValue*[T](self: Opt[T] | Option[T], value, body, body2: untyped): untyped =
+  let elseBody = body2[0]
+  quote do:
+    if `self`.isSome:
+      let `value` {.inject.} = `self`.get()
+      `body`
+    else:
+      `elseBody`
+
+template valueOr*[T](self: Option[T], body: untyped): untyped =
+  if self.isSome:
+    self.get()
+  else:
+    body
+
+template toOpt*[T, E](self: Result[T, E]): Opt[T] =
+  if self.isOk:
+    when T is void: Result[void, void].ok()
+    else: Opt.some(self.unsafeGet())
+  else:
+    Opt.none(type(T))

libp2p/wire.nim

@@ -89,7 +89,7 @@ proc connect*(
 
   compilesOr:
     return connect(transportAddress, bufferSize, child,
-      if localAddress.isSome(): initTAddress(localAddress.get()).tryGet() else : TransportAddress(),
+      if localAddress.isSome(): initTAddress(localAddress.expect("just checked")).tryGet() else: TransportAddress(),
       flags)
   do:
     # support for older chronos versions
@@ -152,7 +152,7 @@ proc createStreamServer*[T](ma: MultiAddress,
     raise newException(LPError, exc.msg)
 
 proc createAsyncSocket*(ma: MultiAddress): AsyncFD
-  {.raises: [LPError].} =
+  {.raises: [ValueError, LPError].} =
   ## Create new asynchronous socket using MultiAddress' ``ma`` socket type and
   ## protocol information.
   ##

tests/testautonat.nim

@@ -43,8 +43,8 @@ proc makeAutonatServicePrivate(): Switch =
     discard await conn.readLp(1024)
     await conn.writeLp(AutonatDialResponse(
       status: DialError,
-      text: some("dial failed"),
+      text: Opt.some("dial failed"),
-      ma: none(MultiAddress)).encode().buffer)
+      ma: Opt.none(MultiAddress)).encode().buffer)
     await conn.close()
   autonatProtocol.codec = AutonatCodec
   result = newStandardSwitch()
@@ -93,8 +93,8 @@ suite "Autonat":
 
     await src.connect(dst.peerInfo.peerId, dst.peerInfo.addrs)
     let conn = await src.dial(dst.peerInfo.peerId, @[AutonatCodec])
-    let buffer = AutonatDial(peerInfo: some(AutonatPeerInfo(
+    let buffer = AutonatDial(peerInfo: Opt.some(AutonatPeerInfo(
-                         id: some(src.peerInfo.peerId),
+                         id: Opt.some(src.peerInfo.peerId),
                          # we ask to be dialed in the does nothing listener instead
                          addrs: doesNothingListener.addrs
                        ))).encode().buffer

tests/testautonatservice.nim

@@ -78,7 +78,7 @@ suite "Autonat Service":
 
   asyncTest "Peer must be reachable":
 
-    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), some(1.seconds))
+    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(1.seconds))
 
     let switch1 = createSwitch(autonatService)
     let switch2 = createSwitch()
@@ -87,7 +87,7 @@ suite "Autonat Service":
 
     let awaiter = newFuture[void]()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() >= 0.3:
         if not awaiter.finished:
           awaiter.complete()
@@ -122,7 +122,7 @@ suite "Autonat Service":
     let autonatClientStub = AutonatClientStub.new(expectedDials = 6)
     autonatClientStub.answer = NotReachable
 
-    let autonatService = AutonatService.new(autonatClientStub, newRng(), some(1.seconds))
+    let autonatService = AutonatService.new(autonatClientStub, newRng(), Opt.some(1.seconds))
 
     let switch1 = createSwitch(autonatService)
     let switch2 = createSwitch()
@@ -131,7 +131,7 @@ suite "Autonat Service":
 
     let awaiter = newFuture[void]()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.NotReachable and confidence.isSome() and confidence.get() >= 0.3:
         if not awaiter.finished:
           autonatClientStub.answer = Reachable
@@ -164,7 +164,7 @@ suite "Autonat Service":
 
   asyncTest "Peer must be reachable when one connected peer has autonat disabled":
 
-    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), some(1.seconds), maxQueueSize = 2)
+    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(1.seconds), maxQueueSize = 2)
 
     let switch1 = createSwitch(autonatService)
     let switch2 = createSwitch(withAutonat = false)
@@ -173,7 +173,7 @@ suite "Autonat Service":
 
     let awaiter = newFuture[void]()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() == 1:
         if not awaiter.finished:
           awaiter.complete()
@@ -204,7 +204,7 @@ suite "Autonat Service":
     let autonatClientStub = AutonatClientStub.new(expectedDials = 6)
     autonatClientStub.answer = NotReachable
 
-    let autonatService = AutonatService.new(autonatClientStub, newRng(), some(1.seconds), maxQueueSize = 3)
+    let autonatService = AutonatService.new(autonatClientStub, newRng(), Opt.some(1.seconds), maxQueueSize = 3)
 
     let switch1 = createSwitch(autonatService)
     let switch2 = createSwitch()
@@ -213,7 +213,7 @@ suite "Autonat Service":
 
     let awaiter = newFuture[void]()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.NotReachable and confidence.isSome() and confidence.get() >= 0.3:
         if not awaiter.finished:
           autonatClientStub.answer = Unknown
@@ -247,7 +247,7 @@ suite "Autonat Service":
   asyncTest "Calling setup and stop twice must work":
 
     let switch = createSwitch()
-    let autonatService = AutonatService.new(AutonatClientStub.new(expectedDials = 0), newRng(), some(1.seconds))
+    let autonatService = AutonatService.new(AutonatClientStub.new(expectedDials = 0), newRng(), Opt.some(1.seconds))
 
     check (await autonatService.setup(switch)) == true
     check (await autonatService.setup(switch)) == false
@@ -258,7 +258,7 @@ suite "Autonat Service":
     await allFuturesThrowing(switch.stop())
 
   asyncTest "Must bypass maxConnectionsPerPeer limit":
-    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), some(1.seconds), maxQueueSize = 1)
+    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(1.seconds), maxQueueSize = 1)
 
     let switch1 = createSwitch(autonatService, maxConnsPerPeer = 0)
     await switch1.setDNSAddr()
@@ -267,7 +267,7 @@ suite "Autonat Service":
 
     let awaiter = newFuture[void]()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() == 1:
         if not awaiter.finished:
           awaiter.complete()
@@ -290,9 +290,9 @@ suite "Autonat Service":
       switch1.stop(), switch2.stop())
 
   asyncTest "Must work when peers ask each other at the same time with max 1 conn per peer":
-    let autonatService1 = AutonatService.new(AutonatClient.new(), newRng(), some(500.millis), maxQueueSize = 3)
+    let autonatService1 = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(500.millis), maxQueueSize = 3)
-    let autonatService2 = AutonatService.new(AutonatClient.new(), newRng(), some(500.millis), maxQueueSize = 3)
+    let autonatService2 = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(500.millis), maxQueueSize = 3)
-    let autonatService3 = AutonatService.new(AutonatClient.new(), newRng(), some(500.millis), maxQueueSize = 3)
+    let autonatService3 = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(500.millis), maxQueueSize = 3)
 
     let switch1 = createSwitch(autonatService1, maxConnsPerPeer = 0)
     let switch2 = createSwitch(autonatService2, maxConnsPerPeer = 0)
@@ -302,12 +302,12 @@ suite "Autonat Service":
     let awaiter2 = newFuture[void]()
     let awaiter3 = newFuture[void]()
 
-    proc statusAndConfidenceHandler1(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler1(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() == 1:
         if not awaiter1.finished:
           awaiter1.complete()
 
-    proc statusAndConfidenceHandler2(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler2(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() == 1:
         if not awaiter2.finished:
           awaiter2.complete()
@@ -337,15 +337,15 @@ suite "Autonat Service":
       switch1.stop(), switch2.stop(), switch3.stop())
 
   asyncTest "Must work for one peer when two peers ask each other at the same time with max 1 conn per peer":
-    let autonatService1 = AutonatService.new(AutonatClient.new(), newRng(), some(500.millis), maxQueueSize = 3)
+    let autonatService1 = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(500.millis), maxQueueSize = 3)
-    let autonatService2 = AutonatService.new(AutonatClient.new(), newRng(), some(500.millis), maxQueueSize = 3)
+    let autonatService2 = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(500.millis), maxQueueSize = 3)
 
     let switch1 = createSwitch(autonatService1, maxConnsPerPeer = 0)
     let switch2 = createSwitch(autonatService2, maxConnsPerPeer = 0)
 
     let awaiter1 = newFuture[void]()
 
-    proc statusAndConfidenceHandler1(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler1(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() == 1:
         if not awaiter1.finished:
           awaiter1.complete()
@@ -378,7 +378,7 @@ suite "Autonat Service":
       switch1.stop(), switch2.stop())
 
   asyncTest "Must work with low maxConnections":
-    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), some(1.seconds), maxQueueSize = 1)
+    let autonatService = AutonatService.new(AutonatClient.new(), newRng(), Opt.some(1.seconds), maxQueueSize = 1)
 
     let switch1 = createSwitch(autonatService, maxConns = 4)
     let switch2 = createSwitch()
@@ -388,7 +388,7 @@ suite "Autonat Service":
 
     var awaiter = newFuture[void]()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       if networkReachability == NetworkReachability.Reachable and confidence.isSome() and confidence.get() == 1:
         if not awaiter.finished:
           awaiter.complete()
@@ -428,7 +428,7 @@ suite "Autonat Service":
     let switch1 = createSwitch(autonatService)
     let switch2 = createSwitch()
 
-    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Option[float]) {.gcsafe, async.} =
+    proc statusAndConfidenceHandler(networkReachability: NetworkReachability, confidence: Opt[float]) {.gcsafe, async.} =
       fail()
 
     check autonatService.networkReachability == NetworkReachability.Unknown

tests/testrelayv1.nim

@@ -48,20 +48,20 @@ suite "Circuit Relay":
     r {.threadvar.}: Relay
     conn {.threadvar.}: Connection
     msg {.threadvar.}: ProtoBuffer
-    rcv {.threadvar.}: Option[RelayMessage]
+    rcv {.threadvar.}: Opt[RelayMessage]
 
   proc createMsg(
-    msgType: Option[RelayType] = RelayType.none,
+    msgType: Opt[RelayType] = Opt.none(RelayType),
-    status: Option[StatusV1] = StatusV1.none,
+    status: Opt[StatusV1] = Opt.none(StatusV1),
-    src: Option[RelayPeer] = RelayPeer.none,
+    src: Opt[RelayPeer] = Opt.none(RelayPeer),
-    dst: Option[RelayPeer] = RelayPeer.none): ProtoBuffer =
+    dst: Opt[RelayPeer] = Opt.none(RelayPeer)): ProtoBuffer =
     encode(RelayMessage(msgType: msgType, srcPeer: src, dstPeer: dst, status: status))
 
-  proc checkMsg(msg: Option[RelayMessage],
+  proc checkMsg(msg: Opt[RelayMessage],
-    msgType: Option[RelayType] = none[RelayType](),
+    msgType: Opt[RelayType] = Opt.none(RelayType),
-    status: Option[StatusV1] = none[StatusV1](),
+    status: Opt[StatusV1] = Opt.none(StatusV1),
-    src: Option[RelayPeer] = none[RelayPeer](),
+    src: Opt[RelayPeer] = Opt.none(RelayPeer),
-    dst: Option[RelayPeer] = none[RelayPeer]()) =
+    dst: Opt[RelayPeer] = Opt.none(RelayPeer)) =
     check: msg.isSome
     let m = msg.get()
     check: m.msgType == msgType
@@ -119,116 +119,116 @@ suite "Circuit Relay":
     await srelay.start()
 
   asyncTest "Handle CanHop":
-    msg = createMsg(some(CanHop))
+    msg = createMsg(Opt.some(CanHop))
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(StatusV1.Success))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(StatusV1.Success))
 
     conn = await src.dial(dst.peerInfo.peerId, dst.peerInfo.addrs, RelayV1Codec)
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantSpeakRelay))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantSpeakRelay))
 
     await conn.close()
 
   asyncTest "Malformed":
     conn = await srelay.dial(dst.peerInfo.peerId, dst.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Status))
+    msg = createMsg(Opt.some(RelayType.Status))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
     await conn.close()
-    rcv.checkMsg(some(RelayType.Status), some(StatusV1.MalformedMessage))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(StatusV1.MalformedMessage))
 
   asyncTest "Handle Stop Error":
     conn = await srelay.dial(dst.peerInfo.peerId, dst.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Stop),
+    msg = createMsg(Opt.some(RelayType.Stop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      none(RelayPeer),
+      Opt.none(RelayPeer),
-      some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(StopSrcMultiaddrInvalid))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(StopSrcMultiaddrInvalid))
 
     conn = await srelay.dial(dst.peerInfo.peerId, dst.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Stop),
+    msg = createMsg(Opt.some(RelayType.Stop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
-      none(RelayPeer))
+      Opt.none(RelayPeer))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(StopDstMultiaddrInvalid))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(StopDstMultiaddrInvalid))
 
     conn = await srelay.dial(dst.peerInfo.peerId, dst.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Stop),
+    msg = createMsg(Opt.some(RelayType.Stop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
     await conn.close()
-    rcv.checkMsg(some(RelayType.Status), some(StopDstMultiaddrInvalid))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(StopDstMultiaddrInvalid))
 
   asyncTest "Handle Hop Error":
     conn = await src.dial(dst.peerInfo.peerId, dst.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop))
+    msg = createMsg(Opt.some(RelayType.Hop))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantSpeakRelay))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantSpeakRelay))
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      none(RelayPeer),
+      Opt.none(RelayPeer),
-      some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopSrcMultiaddrInvalid))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopSrcMultiaddrInvalid))
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)),
-      some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopSrcMultiaddrInvalid))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopSrcMultiaddrInvalid))
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
-      none(RelayPeer))
+      Opt.none(RelayPeer))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopDstMultiaddrInvalid))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopDstMultiaddrInvalid))
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
-      some(RelayPeer(peerId: srelay.peerInfo.peerId, addrs: srelay.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: srelay.peerInfo.peerId, addrs: srelay.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantRelayToSelf))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantRelayToSelf))
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
-      some(RelayPeer(peerId: srelay.peerInfo.peerId, addrs: srelay.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: srelay.peerInfo.peerId, addrs: srelay.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantRelayToSelf))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantRelayToSelf))
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
-      some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: dst.peerInfo.peerId, addrs: dst.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopNoConnToDst))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopNoConnToDst))
 
     await srelay.connect(dst.peerInfo.peerId, dst.peerInfo.addrs)
 
@@ -237,7 +237,7 @@ suite "Circuit Relay":
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantSpeakRelay))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantSpeakRelay))
     r.maxCircuit = tmp
     await conn.close()
 
@@ -246,7 +246,7 @@ suite "Circuit Relay":
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantSpeakRelay))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantSpeakRelay))
     r.maxCircuitPerPeer = tmp
     await conn.close()
 
@@ -255,13 +255,13 @@ suite "Circuit Relay":
     await srelay.connect(dst2.peerInfo.peerId, dst2.peerInfo.addrs)
 
     conn = await src.dial(srelay.peerInfo.peerId, srelay.peerInfo.addrs, RelayV1Codec)
-    msg = createMsg(some(RelayType.Hop),
+    msg = createMsg(Opt.some(RelayType.Hop),
-      none(StatusV1),
+      Opt.none(StatusV1),
-      some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
+      Opt.some(RelayPeer(peerId: src.peerInfo.peerId, addrs: src.peerInfo.addrs)),
-      some(RelayPeer(peerId: dst2.peerInfo.peerId, addrs: dst2.peerInfo.addrs)))
+      Opt.some(RelayPeer(peerId: dst2.peerInfo.peerId, addrs: dst2.peerInfo.addrs)))
     await conn.writeLp(msg.buffer)
     rcv = RelayMessage.decode(await conn.readLp(1024))
-    rcv.checkMsg(some(RelayType.Status), some(HopCantDialDst))
+    rcv.checkMsg(Opt.some(RelayType.Status), Opt.some(HopCantDialDst))
     await allFutures(dst2.stop())
 
   asyncTest "Dial Peer":

tests/testrelayv2.nim

@@ -81,7 +81,7 @@ suite "Circuit Relay V2":
       let msg = HopMessage.decode(await conn.readLp(RelayMsgSize)).get()
       check:
         msg.msgType == HopMessageType.Status
-        msg.status == some(StatusV2.ReservationRefused)
+        msg.status == Opt.some(StatusV2.ReservationRefused)
 
     asyncTest "Too many reservations + Reconnect":
       expect(ReservationError):

tests/testutility.nim

@@ -9,7 +9,6 @@
 # This file may not be copied, modified, or distributed except according to
 # those terms.
 
-import strformat
 import ./helpers
 import ../libp2p/utility