79 lines
2.4 KiB
Nim
79 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 chronos, chronicles
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import ../protocols/protocol,
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../stream/connection,
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../errors
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logScope:
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topics = "libp2p muxer"
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const
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DefaultChanTimeout* = 5.minutes
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type
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StreamHandler* = proc(conn: Connection): Future[void] {.gcsafe.}
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MuxerHandler* = proc(muxer: Muxer): Future[void] {.gcsafe.}
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Muxer* = ref object of RootObj
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streamHandler*: StreamHandler
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connection*: Connection
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# user provider proc that returns a constructed Muxer
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MuxerConstructor* = proc(conn: Connection): Muxer {.gcsafe, closure.}
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# this wraps a creator proc that knows how to make muxers
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MuxerProvider* = ref object of LPProtocol
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newMuxer*: MuxerConstructor
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streamHandler*: StreamHandler # triggered every time there is a new stream, called for any muxer instance
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muxerHandler*: MuxerHandler # triggered every time there is a new muxed connection created
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func shortLog*(m: Muxer): auto = shortLog(m.connection)
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chronicles.formatIt(Muxer): shortLog(it)
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# muxer interface
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method newStream*(m: Muxer, name: string = "", lazy: bool = false):
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Future[Connection] {.base, async, gcsafe.} = discard
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method close*(m: Muxer) {.base, async, gcsafe.} = discard
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method handle*(m: Muxer): Future[void] {.base, async, gcsafe.} = discard
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proc newMuxerProvider*(creator: MuxerConstructor, codec: string): MuxerProvider {.gcsafe.} =
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new result
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result.newMuxer = creator
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result.codec = codec
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result.init()
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method init(c: MuxerProvider) =
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proc handler(conn: Connection, proto: string) {.async, gcsafe, closure.} =
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trace "starting muxer handler", proto=proto, conn
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try:
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let
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muxer = c.newMuxer(conn)
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if not isNil(c.streamHandler):
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muxer.streamHandler = c.streamHandler
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var futs = newSeq[Future[void]]()
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futs &= muxer.handle()
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# finally await both the futures
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if not isNil(c.muxerHandler):
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futs &= c.muxerHandler(muxer)
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checkFutures(await allFinished(futs))
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "exception in muxer handler", exc = exc.msg, conn, proto
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finally:
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await conn.close()
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c.handler = handler
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