134 lines
4.7 KiB
Nim
134 lines
4.7 KiB
Nim
## Nim-LibP2P
|
|
## Copyright (c) 2019 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.
|
|
|
|
import sequtils, tables, options, sets, strutils
|
|
import chronos, chronicles
|
|
import pubsub,
|
|
pubsubpeer,
|
|
timedcache,
|
|
rpc/[messages, message],
|
|
../../crypto/crypto,
|
|
../../connection,
|
|
../../peerinfo,
|
|
../../peer
|
|
|
|
logScope:
|
|
topic = "FloodSub"
|
|
|
|
const FloodSubCodec* = "/floodsub/1.0.0"
|
|
|
|
type
|
|
FloodSub* = ref object of PubSub
|
|
floodsub*: Table[string, HashSet[string]] # topic to remote peer map
|
|
seen*: TimedCache[string] # list of messages forwarded to peers
|
|
|
|
method subscribeTopic*(f: FloodSub,
|
|
topic: string,
|
|
subscribe: bool,
|
|
peerId: string) {.gcsafe.} =
|
|
procCall PubSub(f).subscribeTopic(topic, subscribe, peerId)
|
|
|
|
if topic notin f.floodsub:
|
|
f.floodsub[topic] = initHashSet[string]()
|
|
|
|
if subscribe:
|
|
trace "adding subscription for topic", peer = peerId, name = topic
|
|
# subscribe the peer to the topic
|
|
f.floodsub[topic].incl(peerId)
|
|
else:
|
|
trace "removing subscription for topic", peer = peerId, name = topic
|
|
# unsubscribe the peer from the topic
|
|
f.floodsub[topic].excl(peerId)
|
|
|
|
method handleDisconnect*(f: FloodSub, peer: PubSubPeer) {.async.} =
|
|
## handle peer disconnects
|
|
for t in f.floodsub.keys:
|
|
f.floodsub[t].excl(peer.id)
|
|
|
|
method rpcHandler*(f: FloodSub,
|
|
peer: PubSubPeer,
|
|
rpcMsgs: seq[RPCMsg]) {.async.} =
|
|
await procCall PubSub(f).rpcHandler(peer, rpcMsgs)
|
|
|
|
for m in rpcMsgs: # for all RPC messages
|
|
if m.messages.len > 0: # if there are any messages
|
|
var toSendPeers: HashSet[string] = initHashSet[string]()
|
|
for msg in m.messages: # for every message
|
|
if msg.msgId notin f.seen:
|
|
f.seen.put(msg.msgId) # add the message to the seen cache
|
|
|
|
if not msg.verify(peer.peerInfo):
|
|
trace "dropping message due to failed signature verification"
|
|
continue
|
|
|
|
if not (await f.validate(msg)):
|
|
trace "dropping message due to failed validation"
|
|
continue
|
|
|
|
for t in msg.topicIDs: # for every topic in the message
|
|
if t in f.floodsub:
|
|
toSendPeers.incl(f.floodsub[t]) # get all the peers interested in this topic
|
|
if t in f.topics: # check that we're subscribed to it
|
|
for h in f.topics[t].handler:
|
|
trace "calling handler for message", msg = msg.msgId,
|
|
topicId = t,
|
|
localPeer = f.peerInfo.id,
|
|
fromPeer = msg.fromPeerId().pretty
|
|
await h(t, msg.data) # trigger user provided handler
|
|
|
|
# forward the message to all peers interested in it
|
|
for p in toSendPeers:
|
|
if p in f.peers and f.peers[p].id != peer.id:
|
|
await f.peers[p].send(@[RPCMsg(messages: m.messages)])
|
|
|
|
method init(f: FloodSub) =
|
|
proc handler(conn: Connection, proto: string) {.async.} =
|
|
## main protocol handler that gets triggered on every
|
|
## connection for a protocol string
|
|
## e.g. ``/floodsub/1.0.0``, etc...
|
|
##
|
|
|
|
await f.handleConn(conn, proto)
|
|
|
|
f.handler = handler
|
|
f.codec = FloodSubCodec
|
|
|
|
method publish*(f: FloodSub,
|
|
topic: string,
|
|
data: seq[byte]) {.async.} =
|
|
await procCall PubSub(f).publish(topic, data)
|
|
|
|
if data.len <= 0 or topic.len <= 0:
|
|
trace "topic or data missing, skipping publish"
|
|
return
|
|
|
|
if topic notin f.floodsub:
|
|
trace "missing peers for topic, skipping publish"
|
|
return
|
|
|
|
trace "publishing on topic", name = topic
|
|
let msg = newMessage(f.peerInfo, data, topic)
|
|
for p in f.floodsub[topic]:
|
|
trace "publishing message", name = topic, peer = p, data = data
|
|
await f.peers[p].send(@[RPCMsg(messages: @[msg])])
|
|
|
|
method unsubscribe*(f: FloodSub,
|
|
topics: seq[TopicPair]) {.async.} =
|
|
await procCall PubSub(f).unsubscribe(topics)
|
|
|
|
for p in f.peers.values:
|
|
await f.sendSubs(p, topics.mapIt(it.topic).deduplicate(), false)
|
|
|
|
method initPubSub*(f: FloodSub) =
|
|
f.peers = initTable[string, PubSubPeer]()
|
|
f.topics = initTable[string, Topic]()
|
|
f.floodsub = initTable[string, HashSet[string]]()
|
|
f.seen = newTimedCache[string](2.minutes)
|
|
f.init()
|