97 lines
2.4 KiB
Nim
97 lines
2.4 KiB
Nim
## Nim-Codex
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## Copyright (c) 2021 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 pkg/upraises
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push: {.upraises: [].}
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import pkg/chronos
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import pkg/chronicles
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import pkg/libp2p
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import ../protobuf/blockexc
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import ../../errors
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logScope:
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topics = "codex blockexcnetworkpeer"
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const
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MaxMessageSize = 100 * 1 shl 20 # manifest files can be big
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type
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ConnProvider* = proc(): Future[Connection] {.gcsafe, closure.}
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RPCHandler* = proc(peer: NetworkPeer, msg: Message): Future[void] {.gcsafe.}
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NetworkPeer* = ref object of RootObj
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id*: PeerId
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handler*: RPCHandler
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sendConn: Connection
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getConn: ConnProvider
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proc connected*(b: NetworkPeer): bool =
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not(isNil(b.sendConn)) and
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not(b.sendConn.closed or b.sendConn.atEof)
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proc readLoop*(b: NetworkPeer, conn: Connection) {.async.} =
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if isNil(conn):
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return
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try:
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while not conn.atEof or not conn.closed:
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let
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data = await conn.readLp(MaxMessageSize)
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msg = Message.ProtobufDecode(data).mapFailure().tryGet()
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trace "Got message for peer", peer = b.id
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await b.handler(b, msg)
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except CatchableError as exc:
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trace "Exception in blockexc read loop", exc = exc.msg
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finally:
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await conn.close()
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proc connect*(b: NetworkPeer): Future[Connection] {.async.} =
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if b.connected:
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return b.sendConn
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b.sendConn = await b.getConn()
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asyncSpawn b.readLoop(b.sendConn)
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return b.sendConn
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proc send*(b: NetworkPeer, msg: Message) {.async.} =
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let conn = await b.connect()
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if isNil(conn):
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trace "Unable to get send connection for peer message not sent", peer = b.id
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return
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trace "Sending message to remote", peer = b.id
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await conn.writeLp(ProtobufEncode(msg))
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proc broadcast*(b: NetworkPeer, msg: Message) =
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proc sendAwaiter() {.async.} =
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try:
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await b.send(msg)
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except CatchableError as exc:
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trace "Exception broadcasting message to peer", peer = b.id, exc = exc.msg
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asyncSpawn sendAwaiter()
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func new*(
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T: type NetworkPeer,
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peer: PeerId,
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connProvider: ConnProvider,
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rpcHandler: RPCHandler): T =
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doAssert(not isNil(connProvider),
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"should supply connection provider")
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NetworkPeer(
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id: peer,
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getConn: connProvider,
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handler: rpcHandler)
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