77 lines
2.4 KiB
Nim
77 lines
2.4 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 options, sets, hashes, strutils
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import chronos, chronicles
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import rpcmsg,
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timedcache,
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../../peer,
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../../peerinfo,
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../../connection,
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../../crypto/crypto,
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../../protobuf/minprotobuf
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logScope:
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topic = "PubSubPeer"
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type
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PubSubPeer* = ref object of RootObj
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id*: string # base58 peer id string
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peerInfo*: PeerInfo
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conn*: Connection
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handler*: RPCHandler
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topics*: seq[string]
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seen: TimedCache[string] # list of messages forwarded to peers
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RPCHandler* = proc(peer: PubSubPeer, msg: seq[RPCMsg]): Future[void] {.gcsafe.}
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proc handle*(p: PubSubPeer) {.async, gcsafe.} =
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trace "handling pubsub rpc", peer = p.id
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try:
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while not p.conn.closed:
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let data = await p.conn.readLp()
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trace "Read data from peer", peer = p.id, data = data.toHex()
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if data.toHex() in p.seen:
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trace "Message already received, skipping", peer = p.id
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continue
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let msg = decodeRpcMsg(data)
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trace "Decoded msg from peer", peer = p.id, msg = msg
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await p.handler(p, @[msg])
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except:
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error "An exception occured while processing pubsub rpc requests", exc = getCurrentExceptionMsg()
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finally:
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trace "closing connection to pubsub peer", peer = p.id
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await p.conn.close()
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proc send*(p: PubSubPeer, msgs: seq[RPCMsg]) {.async, gcsafe.} =
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for m in msgs:
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trace "sending msgs to peer", peer = p.id, msgs = msgs
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let encoded = encodeRpcMsg(m)
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if encoded.buffer.len <= 0:
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trace "empty message, skipping", peer = p.id
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return
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let encodedHex = encoded.buffer.toHex()
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if encodedHex in p.seen:
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trace "message already sent to peer, skipping", peer = p.id
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continue
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trace "sending encoded msgs to peer", peer = p.id, encoded = encodedHex
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await p.conn.writeLp(encoded.buffer)
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p.seen.put(encodedHex)
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proc newPubSubPeer*(conn: Connection, handler: RPCHandler): PubSubPeer =
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new result
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result.handler = handler
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result.conn = conn
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result.peerInfo = conn.peerInfo
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result.id = conn.peerInfo.peerId.get().pretty()
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result.seen = newTimedCache[string]()
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