138 lines
3.5 KiB
Nim
138 lines
3.5 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 pkg/upraises
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push: {.upraises: [].}
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import pkg/chronos
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import pkg/libp2p
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import ../logutils
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logScope:
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topics = "libp2p asyncstreamwrapper"
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const
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AsyncStreamWrapperName* = "AsyncStreamWrapper"
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type
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AsyncStreamWrapper* = ref object of LPStream
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reader*: AsyncStreamReader
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writer*: AsyncStreamWriter
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method initStream*(self: AsyncStreamWrapper) =
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if self.objName.len == 0:
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self.objName = AsyncStreamWrapperName
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procCall LPStream(self).initStream()
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proc new*(
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C: type AsyncStreamWrapper,
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reader: AsyncStreamReader = nil,
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writer: AsyncStreamWriter = nil
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): AsyncStreamWrapper =
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## Create new instance of an asynchronous stream wrapper
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##
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let
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stream = C(reader: reader, writer: writer)
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stream.initStream()
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return stream
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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 AsyncStreamIncompleteError:
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# for all intents and purposes this is an EOF
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raise newLPStreamIncompleteError()
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except AsyncStreamLimitError:
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raise newLPStreamLimitError()
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except AsyncStreamUseClosedError:
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raise newLPStreamEOFError()
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except AsyncStreamError as exc:
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raise newException(LPStreamError, exc.msg)
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method readOnce*(
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self: AsyncStreamWrapper,
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pbytes: pointer,
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nbytes: int
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): Future[int] {.async.} =
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trace "Reading bytes from reader", bytes = nbytes
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if isNil(self.reader):
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error "Async stream wrapper reader nil"
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raiseAssert("Async stream wrapper reader nil")
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if self.atEof:
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raise newLPStreamEOFError()
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withExceptions:
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return await self.reader.readOnce(pbytes, nbytes)
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proc completeWrite(
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self: AsyncStreamWrapper,
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fut: Future[void],
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msgLen: int
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): Future[void] {.async.} =
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withExceptions:
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await fut
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method write*(self: AsyncStreamWrapper, msg: seq[byte]): Future[void] =
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# Avoid a copy of msg being kept in the closure created by `{.async.}` as this
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# drives up memory usage
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trace "Writing bytes to writer", bytes = msg.len
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if isNil(self.writer):
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error "Async stream wrapper writer nil"
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raiseAssert("Async stream wrapper writer nil")
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if self.closed:
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let fut = newFuture[void]("asyncstreamwrapper.write.closed")
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fut.fail(newLPStreamClosedError())
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return fut
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self.completeWrite(self.writer.write(msg, msg.len), msg.len)
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method closed*(self: AsyncStreamWrapper): bool =
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var
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readerClosed = true
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writerClosed = true
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if not isNil(self.reader):
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readerClosed = self.reader.closed
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if not isNil(self.writer):
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writerClosed = self.writer.closed
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return readerClosed and writerClosed
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method atEof*(self: AsyncStreamWrapper): bool =
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self.reader.atEof()
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method closeImpl*(self: AsyncStreamWrapper) {.async.} =
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try:
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trace "Shutting down async chronos stream"
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if not self.closed():
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if not isNil(self.reader) and not self.reader.closed():
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await self.reader.closeWait()
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if not isNil(self.writer) and not self.writer.closed():
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await self.writer.closeWait()
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trace "Shutdown async chronos stream"
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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 async chronos stream", msg = exc.msg
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await procCall LPStream(self).closeImpl()
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