nim-libp2p-experimental/libp2p/protocols/identify.nim

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## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import options
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import chronos, chronicles
import ../protobuf/minprotobuf,
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../peerinfo,
../connection,
../peer,
../crypto/crypto,
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../multiaddress,
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../protocols/protocol
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logScope:
topic = "identify"
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const
IdentifyCodec* = "/ipfs/id/1.0.0"
IdentifyPushCodec* = "/ipfs/id/push/1.0.0"
ProtoVersion* = "ipfs/0.1.0"
AgentVersion* = "nim-libp2p/0.0.1"
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#TODO: implment push identify, leaving out for now as it is not essential
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type
IdentityNoMatchError* = object of CatchableError
IdentityInvalidMsgError* = object of CatchableError
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IdentifyInfo* = object
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pubKey*: Option[PublicKey]
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addrs*: seq[MultiAddress]
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observedAddr*: Option[MultiAddress]
protoVersion*: Option[string]
agentVersion*: Option[string]
protos*: seq[string]
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Identify* = ref object of LPProtocol
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peerInfo*: PeerInfo
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proc encodeMsg*(peerInfo: PeerInfo, observedAddrs: Multiaddress): ProtoBuffer =
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result = initProtoBuffer()
result.write(initProtoField(1, peerInfo.publicKey.get().getBytes()))
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for ma in peerInfo.addrs:
result.write(initProtoField(2, ma.data.buffer))
for proto in peerInfo.protocols:
result.write(initProtoField(3, proto))
result.write(initProtoField(4, observedAddrs.data.buffer))
let protoVersion = ProtoVersion
result.write(initProtoField(5, protoVersion))
let agentVersion = AgentVersion
result.write(initProtoField(6, agentVersion))
result.finish()
proc decodeMsg*(buf: seq[byte]): IdentifyInfo =
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var pb = initProtoBuffer(buf)
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result.pubKey = none(PublicKey)
var pubKey: PublicKey
if pb.getValue(1, pubKey) > 0:
trace "read public key from message", pubKey = $pubKey
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result.pubKey = some(pubKey)
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result.addrs = newSeq[MultiAddress]()
var address = newSeq[byte]()
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while pb.getBytes(2, address) > 0:
if len(address) != 0:
var copyaddr = address
var ma = MultiAddress.init(copyaddr)
result.addrs.add(ma)
trace "read address bytes from message", address = ma
address.setLen(0)
var proto = ""
while pb.getString(3, proto) > 0:
trace "read proto from message", proto = proto
result.protos.add(proto)
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proto = ""
var observableAddr = newSeq[byte]()
if pb.getBytes(4, observableAddr) > 0: # attempt to read the observed addr
var ma = MultiAddress.init(observableAddr)
trace "read observedAddr from message", address = ma
result.observedAddr = some(ma)
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var protoVersion = ""
if pb.getString(5, protoVersion) > 0:
trace "read protoVersion from message", protoVersion = protoVersion
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result.protoVersion = some(protoVersion)
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var agentVersion = ""
if pb.getString(6, agentVersion) > 0:
trace "read agentVersion from message", agentVersion = agentVersion
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result.agentVersion = some(protoVersion)
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proc newIdentify*(peerInfo: PeerInfo): Identify =
new result
result.peerInfo = peerInfo
result.init()
method init*(p: Identify) =
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proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
trace "handling identify request"
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var pb = encodeMsg(p.peerInfo, await conn.getObservedAddrs())
await conn.writeLp(pb.buffer)
# await conn.close() #TODO: investigate why this breaks
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p.handler = handle
p.codec = IdentifyCodec
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proc identify*(p: Identify,
conn: Connection,
remotePeerInfo: PeerInfo): Future[IdentifyInfo] {.async, gcsafe.} =
var message = await conn.readLp()
if len(message) == 0:
trace "identify: Invalid or empty message received!"
raise newException(IdentityInvalidMsgError,
"Invalid or empty message received!")
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result = decodeMsg(message)
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if not isNil(remotePeerInfo) and result.pubKey.isSome:
let peer = PeerID.init(result.pubKey.get())
# do a string comaprison of the ids,
# because that is the only thing we
# have in most cases
if peer != remotePeerInfo.peerId:
trace "Peer ids don't match",
remote = peer.pretty(),
local = remotePeerInfo.id
raise newException(IdentityNoMatchError,
"Peer ids don't match")
trace "Identify for remote peer succeded"
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proc push*(p: Identify, conn: Connection) {.async.} =
await conn.write(IdentifyPushCodec)
var pb = encodeMsg(p.peerInfo, await conn.getObservedAddrs())
await conn.writeLp(pb.buffer)