nim-libp2p-experimental/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.
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import chronos, chronicles
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import lpstream
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logScope:
topic = "ChronosStream"
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type ChronosStream* = ref object of LPStream
reader: AsyncStreamReader
writer: AsyncStreamWriter
server: StreamServer
client: StreamTransport
proc newChronosStream*(server: StreamServer,
client: StreamTransport): ChronosStream =
new result
result.server = server
result.client = client
result.reader = newAsyncStreamReader(client)
result.writer = newAsyncStreamWriter(client)
result.closed = false
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method read*(s: ChronosStream, n = -1): Future[seq[byte]] {.async, gcsafe.} =
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try:
result = await s.reader.read(n)
except AsyncStreamReadError as exc:
raise newLPStreamReadError(exc.par)
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method readExactly*(s: ChronosStream,
pbytes: pointer,
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nbytes: int): Future[void] {.async, gcsafe.} =
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try:
await s.reader.readExactly(pbytes, nbytes)
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except AsyncStreamIncompleteError:
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raise newLPStreamIncompleteError()
except AsyncStreamReadError as exc:
raise newLPStreamReadError(exc.par)
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method readLine*(s: ChronosStream, limit = 0, sep = "\r\n"): Future[string] {.async, gcsafe.} =
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try:
result = await s.reader.readLine(limit, sep)
except AsyncStreamReadError as exc:
raise newLPStreamReadError(exc.par)
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method readOnce*(s: ChronosStream, pbytes: pointer, nbytes: int): Future[int] {.async, gcsafe.} =
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try:
result = await s.reader.readOnce(pbytes, nbytes)
except AsyncStreamReadError as exc:
raise newLPStreamReadError(exc.par)
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method readUntil*(s: ChronosStream,
pbytes: pointer,
nbytes: int,
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sep: seq[byte]): Future[int] {.async, gcsafe.} =
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try:
result = await s.reader.readUntil(pbytes, nbytes, sep)
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except AsyncStreamIncompleteError:
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raise newLPStreamIncompleteError()
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except AsyncStreamLimitError:
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raise newLPStreamLimitError()
except LPStreamReadError as exc:
raise newLPStreamReadError(exc.par)
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method write*(s: ChronosStream, pbytes: pointer, nbytes: int) {.async, gcsafe.} =
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try:
await s.writer.write(pbytes, nbytes)
except AsyncStreamWriteError as exc:
raise newLPStreamWriteError(exc.par)
except AsyncStreamIncompleteError:
raise newLPStreamIncompleteError()
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method write*(s: ChronosStream, msg: string, msglen = -1) {.async, gcsafe.} =
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try:
await s.writer.write(msg, msglen)
except AsyncStreamWriteError as exc:
raise newLPStreamWriteError(exc.par)
except AsyncStreamIncompleteError:
raise newLPStreamIncompleteError()
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method write*(s: ChronosStream, msg: seq[byte], msglen = -1) {.async, gcsafe.} =
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try:
await s.writer.write(msg, msglen)
except AsyncStreamWriteError as exc:
raise newLPStreamWriteError(exc.par)
except AsyncStreamIncompleteError:
raise newLPStreamIncompleteError()
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method close*(s: ChronosStream) {.async, gcsafe.} =
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if not s.closed:
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trace "shutting down server", address = $s.client.remoteAddress()
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await s.writer.finish()
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await s.writer.closeWait()
await s.reader.closeWait()
await s.client.closeWait()
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s.closed = true