mirror of https://github.com/vacp2p/nim-libp2p.git
267 lines
7.3 KiB
Nim
267 lines
7.3 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import options
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import chronicles
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import messages,
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../../../protobuf/minprotobuf,
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../../../crypto/crypto,
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../../../peer
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proc encodeGraft*(graft: ControlGraft, pb: var ProtoBuffer) {.gcsafe.} =
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pb.write(initProtoField(1, graft.topicID))
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proc decodeGraft*(pb: var ProtoBuffer): seq[ControlGraft] {.gcsafe.} =
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trace "decoding graft msg", buffer = pb.buffer.toHex()
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while true:
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var topic: string
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if pb.getString(1, topic) < 0:
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trace "unable to read topic field from graft msg, breaking"
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break
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trace "read topic field from graft msg", topicID = topic
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result.add(ControlGraft(topicID: topic))
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proc encodePrune*(prune: ControlPrune, pb: var ProtoBuffer) {.gcsafe.} =
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pb.write(initProtoField(1, prune.topicID))
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proc decodePrune*(pb: var ProtoBuffer): seq[ControlPrune] {.gcsafe.} =
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trace "decoding prune msg"
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while true:
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var topic: string
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if pb.getString(1, topic) < 0:
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break
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trace "read topic field", topicID = topic
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result.add(ControlPrune(topicID: topic))
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proc encodeIHave*(ihave: ControlIHave, pb: var ProtoBuffer) {.gcsafe.} =
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pb.write(initProtoField(1, ihave.topicID))
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for mid in ihave.messageIDs:
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pb.write(initProtoField(2, mid))
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proc decodeIHave*(pb: var ProtoBuffer): seq[ControlIHave] {.gcsafe.} =
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trace "decoding ihave msg"
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while true:
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var control: ControlIHave
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if pb.enterSubMessage() > 0:
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if pb.getString(1, control.topicID) < 0:
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trace "topic field missing from ihave msg"
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break
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trace "read topic field", topicID = control.topicID
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while true:
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var mid: string
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if pb.getString(2, mid) < 0:
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break
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trace "read messageID field", mid = mid
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control.messageIDs.add(mid)
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result.add(control)
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proc encodeIWant*(iwant: ControlIWant, pb: var ProtoBuffer) {.gcsafe.} =
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for mid in iwant.messageIDs:
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pb.write(initProtoField(1, mid))
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proc decodeIWant*(pb: var ProtoBuffer): seq[ControlIWant] {.gcsafe.} =
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trace "decoding ihave msg"
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while pb.enterSubMessage() > 0:
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var mid: string
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var iWant: ControlIWant
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while pb.getString(1, mid) > 0:
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trace "read messageID field", mid = mid
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iWant.messageIDs.add(mid)
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result.add(iWant)
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proc encodeControl*(control: ControlMessage, pb: var ProtoBuffer) {.gcsafe.} =
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if control.ihave.len > 0:
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var ihave = initProtoBuffer()
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for h in control.ihave:
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h.encodeIHave(ihave)
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# write messages to protobuf
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ihave.finish()
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pb.write(initProtoField(1, ihave))
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if control.iwant.len > 0:
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var iwant = initProtoBuffer()
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for w in control.iwant:
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w.encodeIWant(iwant)
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# write messages to protobuf
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iwant.finish()
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pb.write(initProtoField(2, iwant))
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if control.graft.len > 0:
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var graft = initProtoBuffer()
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for g in control.graft:
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g.encodeGraft(graft)
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# write messages to protobuf
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graft.finish()
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pb.write(initProtoField(3, graft))
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if control.prune.len > 0:
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var prune = initProtoBuffer()
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for p in control.prune:
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p.encodePrune(prune)
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# write messages to protobuf
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prune.finish()
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pb.write(initProtoField(4, prune))
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proc decodeControl*(pb: var ProtoBuffer): Option[ControlMessage] {.gcsafe.} =
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trace "decoding control submessage"
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var control: ControlMessage
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while true:
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var field = pb.enterSubMessage()
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trace "processing submessage", field = field
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case field:
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of 0:
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trace "no submessage found in Control msg"
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break
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of 1:
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control.ihave = pb.decodeIHave()
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of 2:
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control.iwant = pb.decodeIWant()
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of 3:
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control.graft = pb.decodeGraft()
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of 4:
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control.prune = pb.decodePrune()
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else:
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raise newException(CatchableError, "message type not recognized")
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if result.isNone:
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result = some(control)
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proc encodeSubs*(subs: SubOpts, pb: var ProtoBuffer) {.gcsafe.} =
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pb.write(initProtoField(1, subs.subscribe))
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pb.write(initProtoField(2, subs.topic))
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proc decodeSubs*(pb: var ProtoBuffer): seq[SubOpts] {.gcsafe.} =
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while true:
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var subOpt: SubOpts
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var subscr: uint
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discard pb.getVarintValue(1, subscr)
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subOpt.subscribe = cast[bool](subscr)
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trace "read subscribe field", subscribe = subOpt.subscribe
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if pb.getString(2, subOpt.topic) < 0:
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break
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trace "read subscribe field", topicName = subOpt.topic
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result.add(subOpt)
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trace "got subscriptions", subscriptions = result
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proc encodeMessage*(msg: Message, pb: var ProtoBuffer) {.gcsafe.} =
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pb.write(initProtoField(1, msg.fromPeer))
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pb.write(initProtoField(2, msg.data))
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pb.write(initProtoField(3, msg.seqno))
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for t in msg.topicIDs:
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pb.write(initProtoField(4, t))
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if msg.signature.len > 0:
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pb.write(initProtoField(5, msg.signature))
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if msg.key.len > 0:
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pb.write(initProtoField(6, msg.key))
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pb.finish()
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proc decodeMessages*(pb: var ProtoBuffer): seq[Message] {.gcsafe.} =
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# TODO: which of this fields are really optional?
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while true:
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var msg: Message
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if pb.getBytes(1, msg.fromPeer) < 0:
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break
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trace "read message field", fromPeer = msg.fromPeer
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if pb.getBytes(2, msg.data) < 0:
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break
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trace "read message field", data = msg.data
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if pb.getBytes(3, msg.seqno) < 0:
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break
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trace "read message field", seqno = msg.seqno
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var topic: string
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while true:
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if pb.getString(4, topic) < 0:
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break
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msg.topicIDs.add(topic)
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trace "read message field", topicName = topic
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topic = ""
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discard pb.getBytes(5, msg.signature)
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trace "read message field", signature = msg.signature
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discard pb.getBytes(6, msg.key)
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trace "read message field", key = msg.key
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result.add(msg)
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proc encodeRpcMsg*(msg: RPCMsg): ProtoBuffer {.gcsafe.} =
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result = initProtoBuffer()
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trace "encoding msg: ", msg = $msg
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if msg.subscriptions.len > 0:
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var subs = initProtoBuffer()
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for s in msg.subscriptions:
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encodeSubs(s, subs)
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# write subscriptions to protobuf
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subs.finish()
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result.write(initProtoField(1, subs))
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if msg.messages.len > 0:
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var messages = initProtoBuffer()
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for m in msg.messages:
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encodeMessage(m, messages)
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# write messages to protobuf
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messages.finish()
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result.write(initProtoField(2, messages))
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if msg.control.isSome:
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var control = initProtoBuffer()
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msg.control.get.encodeControl(control)
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# write messages to protobuf
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control.finish()
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result.write(initProtoField(3, control))
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if result.buffer.len > 0:
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result.finish()
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proc decodeRpcMsg*(msg: seq[byte]): RPCMsg {.gcsafe.} =
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var pb = initProtoBuffer(msg)
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result.subscriptions = newSeq[SubOpts]()
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while true:
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# decode SubOpts array
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var field = pb.enterSubMessage()
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trace "processing submessage", field = field
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case field:
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of 0:
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trace "no submessage found in RPC msg"
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break
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of 1:
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result.subscriptions = pb.decodeSubs()
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of 2:
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result.messages = pb.decodeMessages()
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of 3:
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result.control = pb.decodeControl()
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else:
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raise newException(CatchableError, "message type not recognized")
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