nim-libp2p/libp2p/muxers/muxer.nim

79 lines
2.4 KiB
Nim
Raw Normal View History

2019-09-03 20:40:51 +00:00
## Nim-LibP2P
2019-09-24 17:48:23 +00:00
## Copyright (c) 2019 Status Research & Development GmbH
2019-09-03 20:40:51 +00:00
## 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 chronos, chronicles
2019-09-12 17:07:34 +00:00
import ../protocols/protocol,
../stream/connection,
../errors
2019-09-03 20:40:51 +00:00
logScope:
topics = "muxer"
const
DefaultChanTimeout* = 5.minutes
2019-09-03 20:40:51 +00:00
type
StreamHandler* = proc(conn: Connection): Future[void] {.gcsafe.}
MuxerHandler* = proc(muxer: Muxer): Future[void] {.gcsafe.}
2019-09-03 20:40:51 +00:00
Muxer* = ref object of RootObj
streamHandler*: StreamHandler
2019-09-03 20:40:51 +00:00
connection*: Connection
2019-11-06 18:09:48 +00:00
# user provider proc that returns a constructed Muxer
MuxerConstructor* = proc(conn: Connection): Muxer {.gcsafe, closure.}
2019-09-03 20:40:51 +00:00
# this wraps a creator proc that knows how to make muxers
MuxerProvider* = ref object of LPProtocol
2019-11-06 18:09:48 +00:00
newMuxer*: MuxerConstructor
streamHandler*: StreamHandler # triggered every time there is a new stream, called for any muxer instance
muxerHandler*: MuxerHandler # triggered every time there is a new muxed connection created
2019-09-06 06:51:19 +00:00
2019-11-06 18:09:48 +00:00
# muxer interface
method newStream*(m: Muxer, name: string = "", lazy: bool = false):
Future[Connection] {.base, async, gcsafe.} = discard
2019-09-06 06:51:19 +00:00
method close*(m: Muxer) {.base, async, gcsafe.} = discard
method handle*(m: Muxer): Future[void] {.base, async, gcsafe.} = discard
2019-09-03 20:40:51 +00:00
proc newMuxerProvider*(creator: MuxerConstructor, codec: string): MuxerProvider {.gcsafe.} =
2019-09-03 20:40:51 +00:00
new result
result.newMuxer = creator
result.codec = codec
2019-09-06 06:51:19 +00:00
result.init()
2019-09-03 20:40:51 +00:00
method init(c: MuxerProvider) =
proc handler(conn: Connection, proto: string) {.async, gcsafe, closure.} =
2020-06-21 09:14:19 +00:00
trace "starting muxer handler", proto=proto, peer = $conn
2020-05-23 16:50:05 +00:00
try:
let
muxer = c.newMuxer(conn)
2020-05-23 16:50:05 +00:00
if not isNil(c.streamHandler):
muxer.streamHandler = c.streamHandler
2020-05-23 16:50:05 +00:00
var futs = newSeq[Future[void]]()
futs &= muxer.handle()
2020-05-23 16:50:05 +00:00
# finally await both the futures
if not isNil(c.muxerHandler):
futs &= c.muxerHandler(muxer)
checkFutures(await allFinished(futs))
except CancelledError as exc:
raise exc
2020-05-23 16:50:05 +00:00
except CatchableError as exc:
2020-06-21 09:14:19 +00:00
trace "exception in muxer handler", exc = exc.msg, peer = $conn, proto=proto
finally:
await conn.close()
2019-09-03 20:40:51 +00:00
c.handler = handler
proc `$`*(m: Muxer): string =
2020-06-21 09:14:19 +00:00
$m.connection