nim-libp2p/libp2p/protocols/identify.nim

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## Nim-LibP2P
## Copyright (c) 2018 Status Research & Development GmbH
## 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.
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import options, strformat
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import chronos, chronicles
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import ../protobuf/minprotobuf,
../peerinfo,
../connection,
../peer,
../crypto/crypto,
../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"
const IdentifyPushCodec* = "/ipfs/id/push/1.0.0"
const ProtoVersion* = "ipfs/0.1.0"
const 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
pubKey*: PublicKey
addrs*: seq[MultiAddress]
observedAddr*: MultiAddress
protoVersion*: string
agentVersion*: 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 =
result = initProtoBuffer()
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result.write(initProtoField(1, peerInfo.peerId.publicKey.getBytes()))
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()
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proc decodeMsg*(buf: seq[byte]): IdentifyInfo =
var pb = initProtoBuffer(buf)
discard pb.getValue(1, result.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
result.addrs.add(MultiAddress.init(copyaddr))
address.setLen(0)
var proto = ""
while pb.getString(3, proto) > 0:
result.protos.add(proto)
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proto = ""
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var observableAddr = newSeq[byte]()
if pb.getBytes(4, observableAddr) > 0: # attempt to read the observed addr
result.observedAddr = MultiAddress.init(observableAddr)
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discard pb.getString(5, result.protoVersion)
discard pb.getString(6, result.agentVersion)
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proc newIdentify*(peerInfo: PeerInfo): Identify =
new result
result.peerInfo = peerInfo
result.init()
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method init*(p: Identify) =
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proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
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var pb = encodeMsg(p.peerInfo, await conn.getObservedAddrs())
await conn.writeLp(pb.buffer)
p.handler = handle
p.codec = IdentifyCodec
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proc identify*(p: Identify,
conn: Connection,
remotePeerInfo: Option[PeerInfo] = none(PeerInfo)):
Future[IdentifyInfo] {.async.} =
var message = await conn.readLp()
if len(message) == 0:
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debug "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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debug "identify: Identify for remote peer succeded"
if remotePeerInfo.isSome and
remotePeerInfo.get().peerId.publicKey != result.pubKey:
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debug "identify: Peer's remote public key doesn't match"
raise newException(IdentityNoMatchError,
"Peer's remote public key doesn't match")
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proc push*(p: Identify, conn: Connection) {.async.} =
await conn.write(IdentifyPushCodec)
var pb = encodeMsg(p.peerInfo, await conn.getObservedAddrs())
let length = pb.getLen()
await conn.writeLp(pb.buffer)