mirror of https://github.com/vacp2p/nim-libp2p.git
161 lines
4.8 KiB
Nim
161 lines
4.8 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 sequtils, tables, sets, strutils
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import chronos, chronicles, metrics
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import pubsub,
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pubsubpeer,
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timedcache,
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peertable,
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rpc/[messages, message],
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../../stream/connection,
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../../peerid,
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../../peerinfo
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logScope:
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topics = "floodsub"
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const FloodSubCodec* = "/floodsub/1.0.0"
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type
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FloodSub* = ref object of PubSub
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floodsub*: PeerTable # topic to remote peer map
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seen*: TimedCache[string] # list of messages forwarded to peers
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method subscribeTopic*(f: FloodSub,
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topic: string,
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subscribe: bool,
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peer: PubsubPeer) {.gcsafe.} =
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procCall PubSub(f).subscribeTopic(topic, subscribe, peer)
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if topic notin f.floodsub:
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f.floodsub[topic] = initHashSet[PubSubPeer]()
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if subscribe:
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trace "adding subscription for topic", peer = peer.id, name = topic
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# subscribe the peer to the topic
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f.floodsub[topic].incl(peer)
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else:
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trace "removing subscription for topic", peer = peer.id, name = topic
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# unsubscribe the peer from the topic
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f.floodsub[topic].excl(peer)
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method unsubscribePeer*(f: FloodSub, peer: PeerID) =
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## handle peer disconnects
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##
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trace "unsubscribing floodsub peer", peer = $peer
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let pubSubPeer = f.peers.getOrDefault(peer)
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if pubSubPeer.isNil:
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return
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for t in toSeq(f.floodsub.keys):
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if t in f.floodsub:
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f.floodsub[t].excl(pubSubPeer)
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procCall PubSub(f).unsubscribePeer(peer)
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method rpcHandler*(f: FloodSub,
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peer: PubSubPeer,
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rpcMsg: RPCMsg) {.async.} =
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await procCall PubSub(f).rpcHandler(peer, rpcMsg)
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if rpcMsg.messages.len > 0: # if there are any messages
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var toSendPeers = initHashSet[PubSubPeer]()
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for msg in rpcMsg.messages: # for every message
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let msgId = f.msgIdProvider(msg)
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logScope: msgId
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if msgId notin f.seen:
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f.seen.put(msgId) # add the message to the seen cache
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if f.verifySignature and not msg.verify(peer.peerId):
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trace "dropping message due to failed signature verification"
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continue
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if not (await f.validate(msg)):
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trace "dropping message due to failed validation"
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continue
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for t in msg.topicIDs: # for every topic in the message
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if t in f.floodsub:
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toSendPeers.incl(f.floodsub[t]) # get all the peers interested in this topic
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await handleData(f, t, msg.data)
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# forward the message to all peers interested in it
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f.broadcast(
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toSeq(toSendPeers),
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RPCMsg(messages: rpcMsg.messages))
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trace "forwared message to peers", peers = toSendPeers.len
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method init*(f: FloodSub) =
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proc handler(conn: Connection, proto: string) {.async.} =
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## main protocol handler that gets triggered on every
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## connection for a protocol string
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## e.g. ``/floodsub/1.0.0``, etc...
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##
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await f.handleConn(conn, proto)
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f.handler = handler
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f.codec = FloodSubCodec
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method publish*(f: FloodSub,
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topic: string,
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data: seq[byte]): Future[int] {.async.} =
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# base returns always 0
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discard await procCall PubSub(f).publish(topic, data)
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if data.len <= 0 or topic.len <= 0:
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trace "topic or data missing, skipping publish"
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return 0
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if topic notin f.floodsub:
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trace "missing peers for topic, skipping publish"
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return
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trace "publishing on topic", name = topic
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inc f.msgSeqno
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let
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msg = Message.init(f.peerInfo, data, topic, f.msgSeqno, f.sign)
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peers = toSeq(f.floodsub.getOrDefault(topic))
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# start the future but do not wait yet
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f.broadcast(
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peers,
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RPCMsg(messages: @[msg]))
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when defined(libp2p_expensive_metrics):
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libp2p_pubsub_messages_published.inc(labelValues = [topic])
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trace "published message to peers", peers = peers.len,
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msg = msg.shortLog()
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return peers.len
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method unsubscribe*(f: FloodSub,
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topics: seq[TopicPair]) {.async.} =
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await procCall PubSub(f).unsubscribe(topics)
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for p in f.peers.values:
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f.sendSubs(p, topics.mapIt(it.topic).deduplicate(), false)
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method unsubscribeAll*(f: FloodSub, topic: string) {.async.} =
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await procCall PubSub(f).unsubscribeAll(topic)
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for p in f.peers.values:
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f.sendSubs(p, @[topic], false)
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method initPubSub*(f: FloodSub) =
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procCall PubSub(f).initPubSub()
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f.floodsub = initTable[string, HashSet[PubSubPeer]]()
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f.seen = newTimedCache[string](2.minutes)
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f.init()
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