nim-libp2p/libp2p/stream/chronosstream.nim

86 lines
2.4 KiB
Nim

## Nim-LibP2P
## 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 oids
import chronos, chronicles
import connection, ../utility
logScope:
topics = "chronosstream"
type ChronosStream* = ref object of Connection
client: StreamTransport
method initStream*(s: ChronosStream) =
if s.objName.len == 0:
s.objName = "ChronosStream"
procCall Connection(s).initStream()
proc newChronosStream*(client: StreamTransport): ChronosStream =
new result
result.client = client
result.initStream()
template withExceptions(body: untyped) =
try:
body
except TransportIncompleteError:
# for all intents and purposes this is an EOF
raise newLPStreamEOFError()
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)
method write*(s: ChronosStream, msg: seq[byte]) {.async.} =
if s.closed:
raise newLPStreamClosedError()
if msg.len == 0:
return
withExceptions:
var written = 0
while not s.client.closed and written < msg.len:
written += await s.client.write(msg[written..<msg.len])
if written < msg.len:
raise (ref LPStreamClosedError)(msg: "Write couldn't finish writing")
method closed*(s: ChronosStream): bool {.inline.} =
result = s.client.closed
method atEof*(s: ChronosStream): bool {.inline.} =
s.client.atEof()
method close*(s: ChronosStream) {.async.} =
try:
if not s.isClosed:
trace "shutting down chronos stream", address = $s.client.remoteAddress(),
oid = s.oid
if not s.client.closed():
await s.client.closeWait()
await procCall Connection(s).close()
except CancelledError as exc:
raise exc
except CatchableError as exc:
trace "error closing chronosstream", exc = exc.msg