83 lines
2.3 KiB
Nim
83 lines
2.3 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 lpstream, ../utility
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logScope:
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topic = "ChronosStream"
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type ChronosStream* = ref object of LPStream
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reader: AsyncStreamReader
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writer: AsyncStreamWriter
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server: StreamServer
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client: StreamTransport
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proc newChronosStream*(server: StreamServer,
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client: StreamTransport): ChronosStream =
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new result
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result.server = server
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result.client = client
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result.reader = newAsyncStreamReader(client)
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result.writer = newAsyncStreamWriter(client)
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result.closeEvent = newAsyncEvent()
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template withExceptions(body: untyped) =
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try:
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body
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except TransportIncompleteError:
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raise newLPStreamIncompleteError()
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except TransportLimitError:
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raise newLPStreamLimitError()
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except TransportError as exc:
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raise newLPStreamIncorrectDefect(exc.msg)
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except AsyncStreamIncompleteError:
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raise newLPStreamIncompleteError()
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method readExactly*(s: ChronosStream,
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pbytes: pointer,
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nbytes: int): Future[void] {.async.} =
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if s.reader.atEof:
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raise newLPStreamEOFError()
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withExceptions:
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await s.reader.readExactly(pbytes, nbytes)
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method readOnce*(s: ChronosStream, pbytes: pointer, nbytes: int): Future[int] {.async.} =
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if s.reader.atEof:
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raise newLPStreamEOFError()
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withExceptions:
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result = await s.reader.readOnce(pbytes, nbytes)
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method write*(s: ChronosStream, msg: seq[byte]) {.async.} =
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if s.writer.atEof:
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raise newLPStreamEOFError()
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withExceptions:
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await s.writer.write(msg)
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method closed*(s: ChronosStream): bool {.inline.} =
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# TODO: we might only need to check for reader's EOF
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result = s.reader.atEof()
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method close*(s: ChronosStream) {.async.} =
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if not s.closed:
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trace "shutting chronos stream", address = $s.client.remoteAddress()
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if not s.writer.closed():
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await s.writer.closeWait()
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if not s.reader.closed():
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await s.reader.closeWait()
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if not s.client.closed():
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await s.client.closeWait()
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s.closeEvent.fire()
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