100 lines
2.7 KiB
Nim
100 lines
2.7 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 oids
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import chronos, chronicles
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import connection
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logScope:
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topics = "chronosstream"
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const
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DefaultChronosStreamTimeout = 10.minutes
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type
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ChronosStream* = ref object of Connection
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client: StreamTransport
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method initStream*(s: ChronosStream) =
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if s.objName.len == 0:
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s.objName = "ChronosStream"
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s.timeoutHandler = proc() {.async, gcsafe.} =
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trace "idle timeout expired, closing ChronosStream"
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await s.close()
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procCall Connection(s).initStream()
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proc init*(C: type ChronosStream,
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client: StreamTransport,
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timeout = DefaultChronosStreamTimeout): ChronosStream =
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result = C(client: client,
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timeout: timeout)
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result.initStream()
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template withExceptions(body: untyped) =
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try:
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body
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except CancelledError as exc:
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raise exc
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except TransportIncompleteError:
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# for all intents and purposes this is an EOF
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raise newLPStreamIncompleteError()
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except TransportLimitError:
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raise newLPStreamLimitError()
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except TransportUseClosedError:
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raise newLPStreamEOFError()
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except TransportError:
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# TODO https://github.com/status-im/nim-chronos/pull/99
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raise newLPStreamEOFError()
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method readOnce*(s: ChronosStream, pbytes: pointer, nbytes: int): Future[int] {.async.} =
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if s.atEof:
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raise newLPStreamEOFError()
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withExceptions:
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result = await s.client.readOnce(pbytes, nbytes)
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s.activity = true # reset activity flag
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method write*(s: ChronosStream, msg: seq[byte]) {.async.} =
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if s.closed:
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raise newLPStreamClosedError()
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if msg.len == 0:
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return
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withExceptions:
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var written = 0
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while not s.client.closed and written < msg.len:
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written += await s.client.write(msg[written..<msg.len])
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s.activity = true # reset activity flag
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if written < msg.len:
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raise (ref LPStreamClosedError)(msg: "Write couldn't finish writing")
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method closed*(s: ChronosStream): bool {.inline.} =
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result = s.client.closed
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method atEof*(s: ChronosStream): bool {.inline.} =
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s.client.atEof()
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method close*(s: ChronosStream) {.async.} =
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try:
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if not s.isClosed:
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trace "shutting down chronos stream", address = $s.client.remoteAddress(),
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oid = $s.oid
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if not s.client.closed():
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await s.client.closeWait()
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await procCall Connection(s).close()
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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 "error closing chronosstream", exc = exc.msg
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