130 lines
4.4 KiB
Nim
130 lines
4.4 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, options, sets, strutils
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import chronos, chronicles
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import pubsub,
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pubsubpeer,
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timedcache,
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rpc/[messages, message],
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../../crypto/crypto,
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../../connection,
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../../peerinfo,
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../../peer
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logScope:
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topic = "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*: Table[string, HashSet[string]] # 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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peerId: string) {.gcsafe.} =
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procCall PubSub(f).subscribeTopic(topic, subscribe, peerId)
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if topic notin f.floodsub:
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f.floodsub[topic] = initHashSet[string]()
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if subscribe:
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trace "adding subscription for topic", peer = peerId, name = topic
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# subscribe the peer to the topic
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f.floodsub[topic].incl(peerId)
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else:
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trace "removing subscription for topic", peer = peerId, name = topic
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# unsubscribe the peer from the topic
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f.floodsub[topic].excl(peerId)
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method handleDisconnect*(f: FloodSub, peer: PubSubPeer) {.async.} =
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## handle peer disconnects
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for t in f.floodsub.keys:
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f.floodsub[t].excl(peer.id)
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method rpcHandler*(f: FloodSub,
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peer: PubSubPeer,
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rpcMsgs: seq[RPCMsg]) {.async.} =
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await procCall PubSub(f).rpcHandler(peer, rpcMsgs)
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for m in rpcMsgs: # for all RPC messages
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if m.messages.len > 0: # if there are any messages
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var toSendPeers: HashSet[string] = initHashSet[string]()
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for msg in m.messages: # for every message
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if msg.msgId notin f.seen:
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f.seen.put(msg.msgId) # add the message to the seen cache
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if not msg.verify(peer.peerInfo):
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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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if t in f.topics: # check that we're subscribed to it
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for h in f.topics[t].handler:
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await h(t, msg.data) # trigger user provided handler
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# forward the message to all peers interested in it
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for p in toSendPeers:
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if p in f.peers and f.peers[p].id != peer.id:
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await f.peers[p].send(@[RPCMsg(messages: m.messages)])
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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]) {.async.} =
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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
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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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let msg = newMessage(f.peerInfo, data, topic)
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for p in f.floodsub[topic]:
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trace "publishing message", name = topic, peer = p, data = data
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await f.peers[p].send(@[RPCMsg(messages: @[msg])])
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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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await f.sendSubs(p, topics.mapIt(it.topic).deduplicate(), false)
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method initPubSub*(f: FloodSub) =
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f.peers = initTable[string, PubSubPeer]()
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f.topics = initTable[string, Topic]()
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f.floodsub = initTable[string, HashSet[string]]()
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f.seen = newTimedCache[string](2.minutes)
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f.init()
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