nim-libp2p/libp2p/stream/chronosstream.nim

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## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
## 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 std/[oids, strformat]
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import chronos, chronicles
import connection
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logScope:
topics = "chronosstream"
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const
DefaultChronosStreamTimeout = 10.minutes
type
ChronosStream* = ref object of Connection
client: StreamTransport
func shortLog*(conn: ChronosStream): string =
if conn.isNil: "ChronosStream(nil)"
elif conn.peerInfo.isNil: $conn.oid
else: &"{shortLog(conn.peerInfo.peerId)}:{conn.oid}"
chronicles.formatIt(ChronosStream): shortLog(it)
method initStream*(s: ChronosStream) =
if s.objName.len == 0:
s.objName = "ChronosStream"
s.timeoutHandler = proc() {.async, gcsafe.} =
trace "idle timeout expired, closing ChronosStream"
await s.close()
procCall Connection(s).initStream()
proc init*(C: type ChronosStream,
client: StreamTransport,
timeout = DefaultChronosStreamTimeout): ChronosStream =
result = C(client: client,
timeout: timeout)
result.initStream()
template withExceptions(body: untyped) =
try:
body
except CancelledError as exc:
raise exc
except TransportIncompleteError:
# for all intents and purposes this is an EOF
raise newLPStreamIncompleteError()
except TransportLimitError:
raise newLPStreamLimitError()
except TransportUseClosedError:
raise newLPStreamEOFError()
except TransportError:
# TODO https://github.com/status-im/nim-chronos/pull/99
raise newLPStreamEOFError()
method readOnce*(s: ChronosStream, pbytes: pointer, nbytes: int): Future[int] {.async.} =
if s.atEof:
raise newLPStreamEOFError()
withExceptions:
result = await s.client.readOnce(pbytes, nbytes)
s.activity = true # reset activity flag
method write*(s: ChronosStream, msg: seq[byte]) {.async.} =
if s.closed:
raise newLPStreamClosedError()
if msg.len == 0:
return
withExceptions:
# StreamTransport will only return written < msg.len on fatal failures where
# further writing is not possible - in such cases, we'll raise here,
# since we don't return partial writes lengths
var written = await s.client.write(msg)
if written < msg.len:
raise (ref LPStreamClosedError)(msg: "Write couldn't finish writing")
s.activity = true # reset activity flag
method closed*(s: ChronosStream): bool {.inline.} =
result = s.client.closed
method atEof*(s: ChronosStream): bool {.inline.} =
s.client.atEof()
method closeImpl*(s: ChronosStream) {.async.} =
try:
trace "shutting down chronos stream", address = $s.client.remoteAddress(),
s
if not s.client.closed():
await s.client.closeWait()
except CancelledError as exc:
raise exc
except CatchableError as exc:
trace "error closing chronosstream", s, msg = exc.msg
await procCall Connection(s).closeImpl()