1190 lines
39 KiB
Nim
1190 lines
39 KiB
Nim
#
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# Chronos Asynchronous Streams
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# (c) Copyright 2019-Present
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# Status Research & Development GmbH
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#
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# Licensed under either of
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# Apache License, version 2.0, (LICENSE-APACHEv2)
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# MIT license (LICENSE-MIT)
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{.push raises: [].}
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import ../[config, asyncloop, asyncsync]
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import ../transports/[common, stream]
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export asyncloop, asyncsync, stream, common
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const
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AsyncStreamDefaultBufferSize* = chronosStreamDefaultBufferSize
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## Default reading stream internal buffer size.
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AsyncStreamDefaultQueueSize* = 0
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## Default writing stream internal queue size.
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AsyncStreamReaderTrackerName* = "async.stream.reader"
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## AsyncStreamReader leaks tracker name
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AsyncStreamWriterTrackerName* = "async.stream.writer"
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## AsyncStreamWriter leaks tracker name
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type
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AsyncStreamError* = object of AsyncError
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AsyncStreamIncorrectDefect* = object of Defect
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AsyncStreamIncompleteError* = object of AsyncStreamError
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AsyncStreamLimitError* = object of AsyncStreamError
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AsyncStreamUseClosedError* = object of AsyncStreamError
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AsyncStreamReadError* = object of AsyncStreamError
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AsyncStreamWriteError* = object of AsyncStreamError
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AsyncStreamWriteEOFError* = object of AsyncStreamWriteError
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AsyncBuffer* = object
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offset*: int
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buffer*: seq[byte]
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events*: array[2, AsyncEvent]
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WriteType* = enum
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Pointer, Sequence, String
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WriteItem* = object
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case kind*: WriteType
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of Pointer:
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dataPtr*: pointer
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of Sequence:
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dataSeq*: seq[byte]
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of String:
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dataStr*: string
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size*: int
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offset*: int
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future*: Future[void].Raising([CancelledError, AsyncStreamError])
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AsyncStreamState* = enum
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Running, ## Stream is online and working
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Error, ## Stream has stored error
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Stopped, ## Stream was closed while working
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Finished, ## Stream was properly finished
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Closing, ## Stream is closing
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Closed ## Stream was closed
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StreamReaderLoop* = proc (stream: AsyncStreamReader): Future[void] {.
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async: (raises: []).}
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## Main read loop for read streams.
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StreamWriterLoop* = proc (stream: AsyncStreamWriter): Future[void] {.
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async: (raises: []).}
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## Main write loop for write streams.
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AsyncStreamReader* = ref object of RootRef
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rsource*: AsyncStreamReader
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tsource*: StreamTransport
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readerLoop*: StreamReaderLoop
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state*: AsyncStreamState
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buffer*: AsyncBuffer
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udata: pointer
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error*: ref AsyncStreamError
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bytesCount*: uint64
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future: Future[void].Raising([])
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AsyncStreamWriter* = ref object of RootRef
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wsource*: AsyncStreamWriter
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tsource*: StreamTransport
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writerLoop*: StreamWriterLoop
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state*: AsyncStreamState
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queue*: AsyncQueue[WriteItem]
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error*: ref AsyncStreamError
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udata: pointer
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bytesCount*: uint64
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future: Future[void].Raising([])
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AsyncStream* = object of RootObj
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reader*: AsyncStreamReader
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writer*: AsyncStreamWriter
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AsyncStreamRW* = AsyncStreamReader | AsyncStreamWriter
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proc init*(t: typedesc[AsyncBuffer], size: int): AsyncBuffer =
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AsyncBuffer(
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buffer: newSeq[byte](size),
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events: [newAsyncEvent(), newAsyncEvent()],
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offset: 0
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)
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proc getBuffer*(sb: AsyncBuffer): pointer {.inline.} =
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unsafeAddr sb.buffer[sb.offset]
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proc bufferLen*(sb: AsyncBuffer): int {.inline.} =
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len(sb.buffer) - sb.offset
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proc getData*(sb: AsyncBuffer): pointer {.inline.} =
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unsafeAddr sb.buffer[0]
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template dataLen*(sb: AsyncBuffer): int =
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sb.offset
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proc `[]`*(sb: AsyncBuffer, index: int): byte {.inline.} =
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doAssert(index < sb.offset)
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sb.buffer[index]
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proc update*(sb: var AsyncBuffer, size: int) {.inline.} =
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sb.offset += size
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template wait*(sb: var AsyncBuffer): untyped =
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sb.events[0].clear()
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sb.events[1].fire()
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sb.events[0].wait()
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template transfer*(sb: var AsyncBuffer): untyped =
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sb.events[1].clear()
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sb.events[0].fire()
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sb.events[1].wait()
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proc forget*(sb: var AsyncBuffer) {.inline.} =
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sb.events[1].clear()
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sb.events[0].fire()
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proc shift*(sb: var AsyncBuffer, size: int) {.inline.} =
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if sb.offset > size:
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moveMem(addr sb.buffer[0], addr sb.buffer[size], sb.offset - size)
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sb.offset = sb.offset - size
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else:
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sb.offset = 0
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proc copyData*(sb: AsyncBuffer, dest: pointer, offset, length: int) {.inline.} =
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copyMem(cast[pointer](cast[uint](dest) + cast[uint](offset)),
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unsafeAddr sb.buffer[0], length)
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proc upload*(sb: ptr AsyncBuffer, pbytes: ptr byte,
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nbytes: int): Future[void] {.
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async: (raises: [CancelledError]).} =
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## You can upload any amount of bytes to the buffer. If size of internal
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## buffer is not enough to fit all the data at once, data will be uploaded
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## via chunks of size up to internal buffer size.
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var length = nbytes
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var srcBuffer = cast[ptr UncheckedArray[byte]](pbytes)
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var srcOffset = 0
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while length > 0:
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let size = min(length, sb[].bufferLen())
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if size == 0:
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# Internal buffer is full, we need to transfer data to consumer.
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await sb[].transfer()
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else:
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# Copy data from `pbytes` to internal buffer.
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copyMem(addr sb[].buffer[sb.offset], addr srcBuffer[srcOffset], size)
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sb[].offset = sb[].offset + size
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srcOffset = srcOffset + size
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length = length - size
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# We notify consumers that new data is available.
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sb[].forget()
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template toDataOpenArray*(sb: AsyncBuffer): auto =
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toOpenArray(sb.buffer, 0, sb.offset - 1)
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template toBufferOpenArray*(sb: AsyncBuffer): auto =
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toOpenArray(sb.buffer, sb.offset, len(sb.buffer) - 1)
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template copyOut*(dest: pointer, item: WriteItem, length: int) =
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if item.kind == Pointer:
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let p = cast[pointer](cast[uint](item.dataPtr) + uint(item.offset))
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copyMem(dest, p, length)
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elif item.kind == Sequence:
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copyMem(dest, unsafeAddr item.dataSeq[item.offset], length)
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elif item.kind == String:
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copyMem(dest, unsafeAddr item.dataStr[item.offset], length)
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proc newAsyncStreamReadError(
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p: ref TransportError
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): ref AsyncStreamReadError {.noinline.} =
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var w = newException(AsyncStreamReadError, "Read stream failed")
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w.msg = w.msg & ", originated from [" & $p.name & "] " & p.msg
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w.parent = p
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w
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proc newAsyncStreamWriteError(
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p: ref TransportError
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): ref AsyncStreamWriteError {.noinline.} =
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var w = newException(AsyncStreamWriteError, "Write stream failed")
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w.msg = w.msg & ", originated from [" & $p.name & "] " & p.msg
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w.parent = p
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w
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proc newAsyncStreamIncompleteError*(): ref AsyncStreamIncompleteError {.
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noinline.} =
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newException(AsyncStreamIncompleteError, "Incomplete data sent or received")
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proc newAsyncStreamLimitError*(): ref AsyncStreamLimitError {.noinline.} =
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newException(AsyncStreamLimitError, "Buffer limit reached")
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proc newAsyncStreamUseClosedError*(): ref AsyncStreamUseClosedError {.
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noinline.} =
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newException(AsyncStreamUseClosedError, "Stream is already closed")
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proc raiseAsyncStreamUseClosedError*() {.
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noinline, noreturn, raises: [AsyncStreamUseClosedError].} =
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raise newAsyncStreamUseClosedError()
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proc raiseAsyncStreamLimitError*() {.
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noinline, noreturn, raises: [AsyncStreamLimitError].} =
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raise newAsyncStreamLimitError()
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proc raiseAsyncStreamIncompleteError*() {.
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noinline, noreturn, raises: [AsyncStreamIncompleteError].} =
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raise newAsyncStreamIncompleteError()
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proc raiseEmptyMessageDefect*() {.noinline, noreturn.} =
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raise newException(AsyncStreamIncorrectDefect,
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"Could not write empty message")
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proc raiseAsyncStreamWriteEOFError*() {.
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noinline, noreturn, raises: [AsyncStreamWriteEOFError].} =
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raise newException(AsyncStreamWriteEOFError,
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"Stream finished or remote side dropped connection")
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proc atEof*(rstream: AsyncStreamReader): bool =
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## Returns ``true`` is reading stream is closed or finished and internal
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## buffer do not have any bytes left.
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if isNil(rstream.readerLoop):
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if isNil(rstream.rsource):
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rstream.tsource.atEof()
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else:
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rstream.rsource.atEof()
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else:
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(rstream.state != AsyncStreamState.Running) and
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(rstream.buffer.dataLen() == 0)
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proc atEof*(wstream: AsyncStreamWriter): bool =
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## Returns ``true`` is writing stream ``wstream`` closed or finished.
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if isNil(wstream.writerLoop):
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if isNil(wstream.wsource):
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wstream.tsource.atEof()
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else:
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wstream.wsource.atEof()
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else:
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# `wstream.future` holds `rstream.writerLoop()` call's result.
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# Return `true` if `writerLoop()` is not yet started or already stopped.
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if isNil(wstream.future) or wstream.future.finished():
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true
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else:
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wstream.state != AsyncStreamState.Running
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proc closed*(rw: AsyncStreamRW): bool =
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## Returns ``true`` is reading/writing stream is closed.
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rw.state in {AsyncStreamState.Closing, Closed}
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proc finished*(rw: AsyncStreamRW): bool =
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## Returns ``true`` if reading/writing stream is finished (completed).
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rw.atEof() and rw.state == AsyncStreamState.Finished
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proc stopped*(rw: AsyncStreamRW): bool =
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## Returns ``true`` if reading/writing stream is stopped (interrupted).
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let loopIsNil =
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when rw is AsyncStreamReader:
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isNil(rw.readerLoop)
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else:
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isNil(rw.writerLoop)
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if loopIsNil:
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when rw is AsyncStreamReader:
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if isNil(rw.rsource): false else: rw.rsource.stopped()
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else:
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if isNil(rw.wsource): false else: rw.wsource.stopped()
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else:
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if isNil(rw.future) or rw.future.finished():
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false
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else:
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rw.state == AsyncStreamState.Stopped
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proc running*(rw: AsyncStreamRW): bool =
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## Returns ``true`` if reading/writing stream is still pending.
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let loopIsNil =
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when rw is AsyncStreamReader:
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isNil(rw.readerLoop)
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else:
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isNil(rw.writerLoop)
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if loopIsNil:
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when rw is AsyncStreamReader:
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if isNil(rw.rsource): rw.tsource.running() else: rw.rsource.running()
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else:
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if isNil(rw.wsource): rw.tsource.running() else: rw.wsource.running()
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else:
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if isNil(rw.future) or rw.future.finished():
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false
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else:
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rw.state == AsyncStreamState.Running
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proc failed*(rw: AsyncStreamRW): bool =
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## Returns ``true`` if reading/writing stream is in failed state.
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let loopIsNil =
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when rw is AsyncStreamReader:
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isNil(rw.readerLoop)
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else:
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isNil(rw.writerLoop)
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if loopIsNil:
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when rw is AsyncStreamReader:
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if isNil(rw.rsource): rw.tsource.failed() else: rw.rsource.failed()
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else:
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if isNil(rw.wsource): rw.tsource.failed() else: rw.wsource.failed()
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else:
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if isNil(rw.future) or rw.future.finished():
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false
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else:
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rw.state == AsyncStreamState.Error
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template checkStreamClosed*(t: untyped) =
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if t.closed(): raiseAsyncStreamUseClosedError()
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template checkStreamFinished*(t: untyped) =
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if t.atEof(): raiseAsyncStreamWriteEOFError()
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template readLoop(body: untyped): untyped =
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while true:
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if rstream.buffer.dataLen() == 0:
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if rstream.state == AsyncStreamState.Error:
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raise rstream.error
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let (consumed, done) = body
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rstream.buffer.shift(consumed)
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rstream.bytesCount = rstream.bytesCount + uint64(consumed)
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if done:
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break
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else:
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if not(rstream.atEof()):
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await rstream.buffer.wait()
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proc readExactly*(rstream: AsyncStreamReader, pbytes: pointer,
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nbytes: int) {.
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async: (raises: [CancelledError, AsyncStreamError]).} =
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## Read exactly ``nbytes`` bytes from read-only stream ``rstream`` and store
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## it to ``pbytes``.
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##
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## If EOF is received and ``nbytes`` is not yet readed, the procedure
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## will raise ``AsyncStreamIncompleteError``.
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doAssert(not(isNil(pbytes)), "pbytes must not be nil")
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doAssert(nbytes >= 0, "nbytes must be non-negative integer")
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checkStreamClosed(rstream)
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if nbytes == 0:
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return
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if isNil(rstream.rsource):
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try:
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await readExactly(rstream.tsource, pbytes, nbytes)
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except CancelledError as exc:
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raise exc
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except TransportIncompleteError:
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raise newAsyncStreamIncompleteError()
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except TransportError as exc:
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raise newAsyncStreamReadError(exc)
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else:
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if isNil(rstream.readerLoop):
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await readExactly(rstream.rsource, pbytes, nbytes)
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else:
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var index = 0
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var pbuffer = cast[ptr UncheckedArray[byte]](pbytes)
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readLoop():
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if rstream.buffer.dataLen() == 0:
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if rstream.atEof():
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raise newAsyncStreamIncompleteError()
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let count = min(nbytes - index, rstream.buffer.dataLen())
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if count > 0:
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rstream.buffer.copyData(addr pbuffer[index], 0, count)
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index += count
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(consumed: count, done: index == nbytes)
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proc readOnce*(rstream: AsyncStreamReader, pbytes: pointer,
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nbytes: int): Future[int] {.
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async: (raises: [CancelledError, AsyncStreamError]).} =
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## Perform one read operation on read-only stream ``rstream``.
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##
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## If internal buffer is not empty, ``nbytes`` bytes will be transferred from
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## internal buffer, otherwise it will wait until some bytes will be available.
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doAssert(not(isNil(pbytes)), "pbytes must not be nil")
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doAssert(nbytes > 0, "nbytes must be positive value")
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checkStreamClosed(rstream)
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if isNil(rstream.rsource):
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try:
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return await readOnce(rstream.tsource, pbytes, nbytes)
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except CancelledError as exc:
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raise exc
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except TransportError as exc:
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raise newAsyncStreamReadError(exc)
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else:
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if isNil(rstream.readerLoop):
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return await readOnce(rstream.rsource, pbytes, nbytes)
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else:
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var count = 0
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readLoop():
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if rstream.buffer.dataLen() == 0:
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(0, rstream.atEof())
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else:
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count = min(rstream.buffer.dataLen(), nbytes)
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rstream.buffer.copyData(pbytes, 0, count)
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(count, true)
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return count
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proc readUntil*(rstream: AsyncStreamReader, pbytes: pointer, nbytes: int,
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sep: seq[byte]): Future[int] {.
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async: (raises: [CancelledError, AsyncStreamError]).} =
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## Read data from the read-only stream ``rstream`` until separator ``sep`` is
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## found.
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##
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## On success, the data and separator will be removed from the internal
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## buffer (consumed). Returned data will include the separator at the end.
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##
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## If EOF is received, and `sep` was not found, procedure will raise
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## ``AsyncStreamIncompleteError``.
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##
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## If ``nbytes`` bytes has been received and `sep` was not found, procedure
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## will raise ``AsyncStreamLimitError``.
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##
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## Procedure returns actual number of bytes read.
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doAssert(not(isNil(pbytes)), "pbytes must not be nil")
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doAssert(len(sep) > 0, "separator must not be empty")
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doAssert(nbytes >= 0, "nbytes must be non-negative value")
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checkStreamClosed(rstream)
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if nbytes == 0:
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raise newAsyncStreamLimitError()
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if isNil(rstream.rsource):
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try:
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return await readUntil(rstream.tsource, pbytes, nbytes, sep)
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except CancelledError as exc:
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raise exc
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except TransportIncompleteError:
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raise newAsyncStreamIncompleteError()
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except TransportLimitError:
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raise newAsyncStreamLimitError()
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except TransportError as exc:
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raise newAsyncStreamReadError(exc)
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else:
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if isNil(rstream.readerLoop):
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return await readUntil(rstream.rsource, pbytes, nbytes, sep)
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else:
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var pbuffer = cast[ptr UncheckedArray[byte]](pbytes)
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var state = 0
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var k = 0
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readLoop():
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if rstream.atEof():
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raise newAsyncStreamIncompleteError()
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var index = 0
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while index < rstream.buffer.dataLen():
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if k >= nbytes:
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raise newAsyncStreamLimitError()
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let ch = rstream.buffer[index]
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inc(index)
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pbuffer[k] = ch
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inc(k)
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if sep[state] == ch:
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inc(state)
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if state == len(sep):
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break
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else:
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state = 0
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(index, state == len(sep))
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return k
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proc readLine*(rstream: AsyncStreamReader, limit = 0,
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sep = "\r\n"): Future[string] {.
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async: (raises: [CancelledError, AsyncStreamError]).} =
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## Read one line from read-only stream ``rstream``, where ``"line"`` is a
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## sequence of bytes ending with ``sep`` (default is ``"\r\n"``).
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##
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## If EOF is received, and ``sep`` was not found, the method will return the
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## partial read bytes.
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##
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## If the EOF was received and the internal buffer is empty, return an
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## empty string.
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##
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## If ``limit`` more then 0, then result string will be limited to ``limit``
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## bytes.
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checkStreamClosed(rstream)
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|
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if isNil(rstream.rsource):
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try:
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return await readLine(rstream.tsource, limit, sep)
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except CancelledError as exc:
|
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raise exc
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except TransportError as exc:
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raise newAsyncStreamReadError(exc)
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else:
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if isNil(rstream.readerLoop):
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return await readLine(rstream.rsource, limit, sep)
|
|
else:
|
|
let lim = if limit <= 0: -1 else: limit
|
|
var state = 0
|
|
var res = ""
|
|
readLoop():
|
|
if rstream.atEof():
|
|
(0, true)
|
|
else:
|
|
var index = 0
|
|
while index < rstream.buffer.dataLen():
|
|
let ch = char(rstream.buffer[index])
|
|
inc(index)
|
|
|
|
if sep[state] == ch:
|
|
inc(state)
|
|
if state == len(sep):
|
|
break
|
|
else:
|
|
if state != 0:
|
|
if limit > 0:
|
|
let missing = min(state, lim - len(res) - 1)
|
|
res.add(sep[0 ..< missing])
|
|
else:
|
|
res.add(sep[0 ..< state])
|
|
res.add(ch)
|
|
if len(res) == lim:
|
|
break
|
|
(index, (state == len(sep)) or (lim == len(res)))
|
|
return res
|
|
|
|
proc read*(rstream: AsyncStreamReader): Future[seq[byte]] {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Read all bytes from read-only stream ``rstream``.
|
|
##
|
|
## This procedure allocates buffer seq[byte] and return it as result.
|
|
checkStreamClosed(rstream)
|
|
|
|
if isNil(rstream.rsource):
|
|
try:
|
|
return await read(rstream.tsource)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportLimitError:
|
|
raise newAsyncStreamLimitError()
|
|
except TransportError as exc:
|
|
raise newAsyncStreamReadError(exc)
|
|
else:
|
|
if isNil(rstream.readerLoop):
|
|
return await read(rstream.rsource)
|
|
else:
|
|
var res = newSeq[byte]()
|
|
readLoop():
|
|
if rstream.atEof():
|
|
(0, true)
|
|
else:
|
|
let count = rstream.buffer.dataLen()
|
|
res.add(rstream.buffer.buffer.toOpenArray(0, count - 1))
|
|
(count, false)
|
|
return res
|
|
|
|
proc read*(rstream: AsyncStreamReader, n: int): Future[seq[byte]] {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Read all bytes (n <= 0) or exactly `n` bytes from read-only stream
|
|
## ``rstream``.
|
|
##
|
|
## This procedure allocates buffer seq[byte] and return it as result.
|
|
checkStreamClosed(rstream)
|
|
|
|
if isNil(rstream.rsource):
|
|
try:
|
|
return await read(rstream.tsource, n)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportError as exc:
|
|
raise newAsyncStreamReadError(exc)
|
|
else:
|
|
if isNil(rstream.readerLoop):
|
|
return await read(rstream.rsource, n)
|
|
else:
|
|
if n <= 0:
|
|
return await read(rstream.rsource)
|
|
else:
|
|
var res = newSeq[byte]()
|
|
readLoop():
|
|
if rstream.atEof():
|
|
(0, true)
|
|
else:
|
|
let count = min(rstream.buffer.dataLen(), n - len(res))
|
|
res.add(rstream.buffer.buffer.toOpenArray(0, count - 1))
|
|
(count, len(res) == n)
|
|
return res
|
|
|
|
proc consume*(rstream: AsyncStreamReader): Future[int] {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Consume (discard) all bytes from read-only stream ``rstream``.
|
|
##
|
|
## Return number of bytes actually consumed (discarded).
|
|
checkStreamClosed(rstream)
|
|
|
|
if isNil(rstream.rsource):
|
|
try:
|
|
return await consume(rstream.tsource)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportLimitError:
|
|
raise newAsyncStreamLimitError()
|
|
except TransportError as exc:
|
|
raise newAsyncStreamReadError(exc)
|
|
else:
|
|
if isNil(rstream.readerLoop):
|
|
return await consume(rstream.rsource)
|
|
else:
|
|
var res = 0
|
|
readLoop():
|
|
if rstream.atEof():
|
|
(0, true)
|
|
else:
|
|
res += rstream.buffer.dataLen()
|
|
(rstream.buffer.dataLen(), false)
|
|
return res
|
|
|
|
proc consume*(rstream: AsyncStreamReader, n: int): Future[int] {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Consume (discard) all bytes (n <= 0) or ``n`` bytes from read-only stream
|
|
## ``rstream``.
|
|
##
|
|
## Return number of bytes actually consumed (discarded).
|
|
checkStreamClosed(rstream)
|
|
|
|
if isNil(rstream.rsource):
|
|
try:
|
|
return await consume(rstream.tsource, n)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportLimitError:
|
|
raise newAsyncStreamLimitError()
|
|
except TransportError as exc:
|
|
raise newAsyncStreamReadError(exc)
|
|
else:
|
|
if isNil(rstream.readerLoop):
|
|
return await consume(rstream.rsource, n)
|
|
else:
|
|
if n <= 0:
|
|
return await rstream.consume()
|
|
else:
|
|
var res = 0
|
|
readLoop():
|
|
if rstream.atEof():
|
|
(0, true)
|
|
else:
|
|
let count = min(rstream.buffer.dataLen(), n - res)
|
|
res += count
|
|
(count, res == n)
|
|
return res
|
|
|
|
proc readMessage*(rstream: AsyncStreamReader, pred: ReadMessagePredicate) {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Read all bytes from stream ``rstream`` until ``predicate`` callback
|
|
## will not be satisfied.
|
|
##
|
|
## ``predicate`` callback should return tuple ``(consumed, result)``, where
|
|
## ``consumed`` is the number of bytes processed and ``result`` is a
|
|
## completion flag (``true`` if readMessage() should stop reading data,
|
|
## or ``false`` if readMessage() should continue to read data from stream).
|
|
##
|
|
## ``predicate`` callback must copy all the data from ``data`` array and
|
|
## return number of bytes it is going to consume.
|
|
## ``predicate`` callback will receive (zero-length) openArray, if stream
|
|
## is at EOF.
|
|
doAssert(not(isNil(pred)), "`predicate` callback should not be `nil`")
|
|
checkStreamClosed(rstream)
|
|
|
|
if isNil(rstream.rsource):
|
|
try:
|
|
await readMessage(rstream.tsource, pred)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportError as exc:
|
|
raise newAsyncStreamReadError(exc)
|
|
else:
|
|
if isNil(rstream.readerLoop):
|
|
await readMessage(rstream.rsource, pred)
|
|
else:
|
|
readLoop():
|
|
let count = rstream.buffer.dataLen()
|
|
if count == 0:
|
|
if rstream.atEof():
|
|
pred([])
|
|
else:
|
|
# Case, when transport's buffer is not yet filled with data.
|
|
(0, false)
|
|
else:
|
|
pred(rstream.buffer.buffer.toOpenArray(0, count - 1))
|
|
|
|
proc write*(wstream: AsyncStreamWriter, pbytes: pointer,
|
|
nbytes: int) {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Write sequence of bytes pointed by ``pbytes`` of length ``nbytes`` to
|
|
## writer stream ``wstream``.
|
|
##
|
|
## ``nbytes`` must be more then zero.
|
|
checkStreamClosed(wstream)
|
|
checkStreamFinished(wstream)
|
|
|
|
if nbytes <= 0:
|
|
raiseEmptyMessageDefect()
|
|
|
|
if isNil(wstream.wsource):
|
|
var res: int
|
|
try:
|
|
res = await write(wstream.tsource, pbytes, nbytes)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportError as exc:
|
|
raise newAsyncStreamWriteError(exc)
|
|
if res != nbytes:
|
|
raise newAsyncStreamIncompleteError()
|
|
wstream.bytesCount = wstream.bytesCount + uint64(nbytes)
|
|
else:
|
|
if isNil(wstream.writerLoop):
|
|
await write(wstream.wsource, pbytes, nbytes)
|
|
wstream.bytesCount = wstream.bytesCount + uint64(nbytes)
|
|
else:
|
|
let item = WriteItem(
|
|
kind: Pointer, dataPtr: pbytes, size: nbytes,
|
|
future: Future[void].Raising([CancelledError, AsyncStreamError])
|
|
.init("async.stream.write(pointer)"))
|
|
await wstream.queue.put(item)
|
|
await item.future
|
|
wstream.bytesCount = wstream.bytesCount + uint64(item.size)
|
|
|
|
proc write*(wstream: AsyncStreamWriter, sbytes: seq[byte],
|
|
msglen = -1) {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Write sequence of bytes ``sbytes`` of length ``msglen`` to writer
|
|
## stream ``wstream``.
|
|
##
|
|
## Sequence of bytes ``sbytes`` must not be zero-length.
|
|
##
|
|
## If ``msglen < 0`` whole sequence ``sbytes`` will be writen to stream.
|
|
## If ``msglen > len(sbytes)`` only ``len(sbytes)`` bytes will be written to
|
|
## stream.
|
|
checkStreamClosed(wstream)
|
|
checkStreamFinished(wstream)
|
|
|
|
let length = if msglen <= 0: len(sbytes) else: min(msglen, len(sbytes))
|
|
if length <= 0:
|
|
raiseEmptyMessageDefect()
|
|
|
|
if isNil(wstream.wsource):
|
|
var res: int
|
|
try:
|
|
res = await write(wstream.tsource, sbytes, length)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportError as exc:
|
|
raise newAsyncStreamWriteError(exc)
|
|
if res != length:
|
|
raise newAsyncStreamIncompleteError()
|
|
wstream.bytesCount = wstream.bytesCount + uint64(length)
|
|
else:
|
|
if isNil(wstream.writerLoop):
|
|
await write(wstream.wsource, sbytes, length)
|
|
wstream.bytesCount = wstream.bytesCount + uint64(length)
|
|
else:
|
|
let item = WriteItem(
|
|
kind: Sequence, dataSeq: sbytes, size: length,
|
|
future: Future[void].Raising([CancelledError, AsyncStreamError])
|
|
.init("async.stream.write(seq)"))
|
|
await wstream.queue.put(item)
|
|
await item.future
|
|
wstream.bytesCount = wstream.bytesCount + uint64(item.size)
|
|
|
|
proc write*(wstream: AsyncStreamWriter, sbytes: string,
|
|
msglen = -1) {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Write string ``sbytes`` of length ``msglen`` to writer stream ``wstream``.
|
|
##
|
|
## String ``sbytes`` must not be zero-length.
|
|
##
|
|
## If ``msglen < 0`` whole string ``sbytes`` will be writen to stream.
|
|
## If ``msglen > len(sbytes)`` only ``len(sbytes)`` bytes will be written to
|
|
## stream.
|
|
checkStreamClosed(wstream)
|
|
checkStreamFinished(wstream)
|
|
|
|
let length = if msglen <= 0: len(sbytes) else: min(msglen, len(sbytes))
|
|
if length <= 0:
|
|
raiseEmptyMessageDefect()
|
|
|
|
if isNil(wstream.wsource):
|
|
var res: int
|
|
try:
|
|
res = await write(wstream.tsource, sbytes, length)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except TransportError as exc:
|
|
raise newAsyncStreamWriteError(exc)
|
|
if res != length:
|
|
raise newAsyncStreamIncompleteError()
|
|
wstream.bytesCount = wstream.bytesCount + uint64(length)
|
|
else:
|
|
if isNil(wstream.writerLoop):
|
|
await write(wstream.wsource, sbytes, length)
|
|
wstream.bytesCount = wstream.bytesCount + uint64(length)
|
|
else:
|
|
let item = WriteItem(
|
|
kind: String, dataStr: sbytes, size: length,
|
|
future: Future[void].Raising([CancelledError, AsyncStreamError])
|
|
.init("async.stream.write(string)"))
|
|
await wstream.queue.put(item)
|
|
await item.future
|
|
wstream.bytesCount = wstream.bytesCount + uint64(item.size)
|
|
|
|
proc finish*(wstream: AsyncStreamWriter) {.
|
|
async: (raises: [CancelledError, AsyncStreamError]).} =
|
|
## Finish write stream ``wstream``.
|
|
checkStreamClosed(wstream)
|
|
# For AsyncStreamWriter Finished state could be set manually or by stream's
|
|
# writeLoop, so we not going to raise exception here.
|
|
if not(wstream.atEof()):
|
|
if not isNil(wstream.wsource):
|
|
if isNil(wstream.writerLoop):
|
|
await wstream.wsource.finish()
|
|
else:
|
|
let item = WriteItem(
|
|
kind: Pointer, size: 0,
|
|
future: Future[void].Raising([CancelledError, AsyncStreamError])
|
|
.init("async.stream.finish"))
|
|
await wstream.queue.put(item)
|
|
await item.future
|
|
|
|
proc join*(rw: AsyncStreamRW): Future[void] {.
|
|
async: (raw: true, raises: [CancelledError]).} =
|
|
## Get Future[void] which will be completed when stream become finished or
|
|
## closed.
|
|
when rw is AsyncStreamReader:
|
|
var retFuture = newFuture[void]("async.stream.reader.join")
|
|
else:
|
|
var retFuture = newFuture[void]("async.stream.writer.join")
|
|
|
|
proc continuation(udata: pointer) {.gcsafe, raises:[].} =
|
|
retFuture.complete()
|
|
|
|
proc cancellation(udata: pointer) {.gcsafe, raises:[].} =
|
|
rw.future.removeCallback(continuation, cast[pointer](retFuture))
|
|
|
|
if not(rw.future.finished()):
|
|
rw.future.addCallback(continuation, cast[pointer](retFuture))
|
|
retFuture.cancelCallback = cancellation
|
|
else:
|
|
retFuture.complete()
|
|
|
|
return retFuture
|
|
|
|
proc close*(rw: AsyncStreamRW) =
|
|
## Close and frees resources of stream ``rw``.
|
|
##
|
|
## Note close() procedure is not completed immediately!
|
|
if not(rw.closed()):
|
|
rw.state = AsyncStreamState.Closing
|
|
|
|
proc continuation(udata: pointer) {.raises: [].} =
|
|
if not isNil(rw.udata):
|
|
GC_unref(cast[ref int](rw.udata))
|
|
if not(rw.future.finished()):
|
|
rw.future.complete()
|
|
when rw is AsyncStreamReader:
|
|
untrackCounter(AsyncStreamReaderTrackerName)
|
|
elif rw is AsyncStreamWriter:
|
|
untrackCounter(AsyncStreamWriterTrackerName)
|
|
rw.state = AsyncStreamState.Closed
|
|
|
|
when rw is AsyncStreamReader:
|
|
if isNil(rw.rsource) or isNil(rw.readerLoop) or isNil(rw.future):
|
|
callSoon(continuation)
|
|
else:
|
|
if rw.future.finished():
|
|
callSoon(continuation)
|
|
else:
|
|
rw.future.addCallback(continuation)
|
|
rw.future.cancelSoon()
|
|
elif rw is AsyncStreamWriter:
|
|
if isNil(rw.wsource) or isNil(rw.writerLoop) or isNil(rw.future):
|
|
callSoon(continuation)
|
|
else:
|
|
if rw.future.finished():
|
|
callSoon(continuation)
|
|
else:
|
|
rw.future.addCallback(continuation)
|
|
rw.future.cancelSoon()
|
|
|
|
proc closeWait*(rw: AsyncStreamRW): Future[void] {.async: (raises: []).} =
|
|
## Close and frees resources of stream ``rw``.
|
|
if not rw.closed():
|
|
rw.close()
|
|
await noCancel(rw.join())
|
|
|
|
proc startReader(rstream: AsyncStreamReader) =
|
|
rstream.state = Running
|
|
if not isNil(rstream.readerLoop):
|
|
rstream.future = rstream.readerLoop(rstream)
|
|
else:
|
|
rstream.future = Future[void].Raising([]).init(
|
|
"async.stream.empty.reader", {FutureFlag.OwnCancelSchedule})
|
|
|
|
proc startWriter(wstream: AsyncStreamWriter) =
|
|
wstream.state = Running
|
|
if not isNil(wstream.writerLoop):
|
|
wstream.future = wstream.writerLoop(wstream)
|
|
else:
|
|
wstream.future = Future[void].Raising([]).init(
|
|
"async.stream.empty.writer", {FutureFlag.OwnCancelSchedule})
|
|
|
|
proc init*(child, wsource: AsyncStreamWriter, loop: StreamWriterLoop,
|
|
queueSize = AsyncStreamDefaultQueueSize) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamWriter
|
|
## parameters.
|
|
child.writerLoop = loop
|
|
child.wsource = wsource
|
|
child.tsource = wsource.tsource
|
|
child.queue = newAsyncQueue[WriteItem](queueSize)
|
|
trackCounter(AsyncStreamWriterTrackerName)
|
|
child.startWriter()
|
|
|
|
proc init*[T](child, wsource: AsyncStreamWriter, loop: StreamWriterLoop,
|
|
queueSize = AsyncStreamDefaultQueueSize, udata: ref T) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamWriter
|
|
## parameters.
|
|
child.writerLoop = loop
|
|
child.wsource = wsource
|
|
child.tsource = wsource.tsource
|
|
child.queue = newAsyncQueue[WriteItem](queueSize)
|
|
if not isNil(udata):
|
|
GC_ref(udata)
|
|
child.udata = cast[pointer](udata)
|
|
trackCounter(AsyncStreamWriterTrackerName)
|
|
child.startWriter()
|
|
|
|
proc init*(child, rsource: AsyncStreamReader, loop: StreamReaderLoop,
|
|
bufferSize = AsyncStreamDefaultBufferSize) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamReader
|
|
## parameters.
|
|
child.readerLoop = loop
|
|
child.rsource = rsource
|
|
child.tsource = rsource.tsource
|
|
child.buffer = AsyncBuffer.init(bufferSize)
|
|
trackCounter(AsyncStreamReaderTrackerName)
|
|
child.startReader()
|
|
|
|
proc init*[T](child, rsource: AsyncStreamReader, loop: StreamReaderLoop,
|
|
bufferSize = AsyncStreamDefaultBufferSize,
|
|
udata: ref T) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamReader
|
|
## parameters.
|
|
child.readerLoop = loop
|
|
child.rsource = rsource
|
|
child.tsource = rsource.tsource
|
|
child.buffer = AsyncBuffer.init(bufferSize)
|
|
if not isNil(udata):
|
|
GC_ref(udata)
|
|
child.udata = cast[pointer](udata)
|
|
trackCounter(AsyncStreamReaderTrackerName)
|
|
child.startReader()
|
|
|
|
proc init*(child: AsyncStreamWriter, tsource: StreamTransport) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamWriter
|
|
## parameters.
|
|
child.writerLoop = nil
|
|
child.wsource = nil
|
|
child.tsource = tsource
|
|
trackCounter(AsyncStreamWriterTrackerName)
|
|
child.startWriter()
|
|
|
|
proc init*[T](child: AsyncStreamWriter, tsource: StreamTransport,
|
|
udata: ref T) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamWriter
|
|
## parameters.
|
|
child.writerLoop = nil
|
|
child.wsource = nil
|
|
child.tsource = tsource
|
|
trackCounter(AsyncStreamWriterTrackerName)
|
|
child.startWriter()
|
|
|
|
proc init*(child, wsource: AsyncStreamWriter) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamWriter
|
|
## parameters.
|
|
child.writerLoop = nil
|
|
child.wsource = wsource
|
|
child.tsource = wsource.tsource
|
|
trackCounter(AsyncStreamWriterTrackerName)
|
|
child.startWriter()
|
|
|
|
proc init*[T](child, wsource: AsyncStreamWriter, udata: ref T) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamWriter
|
|
## parameters.
|
|
child.writerLoop = nil
|
|
child.wsource = wsource
|
|
child.tsource = wsource.tsource
|
|
if not isNil(udata):
|
|
GC_ref(udata)
|
|
child.udata = cast[pointer](udata)
|
|
trackCounter(AsyncStreamWriterTrackerName)
|
|
child.startWriter()
|
|
|
|
proc init*(child: AsyncStreamReader, tsource: StreamTransport) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamReader
|
|
## parameters.
|
|
child.readerLoop = nil
|
|
child.rsource = nil
|
|
child.tsource = tsource
|
|
trackCounter(AsyncStreamReaderTrackerName)
|
|
child.startReader()
|
|
|
|
proc init*[T](child: AsyncStreamReader, tsource: StreamTransport,
|
|
udata: ref T) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamReader
|
|
## parameters.
|
|
child.readerLoop = nil
|
|
child.rsource = nil
|
|
child.tsource = tsource
|
|
if not isNil(udata):
|
|
GC_ref(udata)
|
|
child.udata = cast[pointer](udata)
|
|
trackCounter(AsyncStreamReaderTrackerName)
|
|
child.startReader()
|
|
|
|
proc init*(child, rsource: AsyncStreamReader) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamReader
|
|
## parameters.
|
|
child.readerLoop = nil
|
|
child.rsource = rsource
|
|
child.tsource = rsource.tsource
|
|
trackCounter(AsyncStreamReaderTrackerName)
|
|
child.startReader()
|
|
|
|
proc init*[T](child, rsource: AsyncStreamReader, udata: ref T) =
|
|
## Initialize newly allocated object ``child`` with AsyncStreamReader
|
|
## parameters.
|
|
child.readerLoop = nil
|
|
child.rsource = rsource
|
|
child.tsource = rsource.tsource
|
|
if not isNil(udata):
|
|
GC_ref(udata)
|
|
child.udata = cast[pointer](udata)
|
|
trackCounter(AsyncStreamReaderTrackerName)
|
|
child.startReader()
|
|
|
|
proc newAsyncStreamReader*[T](rsource: AsyncStreamReader,
|
|
loop: StreamReaderLoop,
|
|
bufferSize = AsyncStreamDefaultBufferSize,
|
|
udata: ref T): AsyncStreamReader =
|
|
## Create new AsyncStreamReader object, which will use other async stream
|
|
## reader ``rsource`` as source data channel.
|
|
##
|
|
## ``loop`` is main reading loop procedure.
|
|
##
|
|
## ``bufferSize`` is internal buffer size.
|
|
##
|
|
## ``udata`` - user object which will be associated with new AsyncStreamReader
|
|
## object.
|
|
var res = AsyncStreamReader()
|
|
res.init(rsource, loop, bufferSize, udata)
|
|
res
|
|
|
|
proc newAsyncStreamReader*(rsource: AsyncStreamReader,
|
|
loop: StreamReaderLoop,
|
|
bufferSize = AsyncStreamDefaultBufferSize
|
|
): AsyncStreamReader =
|
|
## Create new AsyncStreamReader object, which will use other async stream
|
|
## reader ``rsource`` as source data channel.
|
|
##
|
|
## ``loop`` is main reading loop procedure.
|
|
##
|
|
## ``bufferSize`` is internal buffer size.
|
|
var res = AsyncStreamReader()
|
|
res.init(rsource, loop, bufferSize)
|
|
res
|
|
|
|
proc newAsyncStreamReader*[T](tsource: StreamTransport,
|
|
udata: ref T): AsyncStreamReader =
|
|
## Create new AsyncStreamReader object, which will use stream transport
|
|
## ``tsource`` as source data channel.
|
|
##
|
|
## ``udata`` - user object which will be associated with new AsyncStreamWriter
|
|
## object.
|
|
var res = AsyncStreamReader()
|
|
res.init(tsource, udata)
|
|
res
|
|
|
|
proc newAsyncStreamReader*(tsource: StreamTransport): AsyncStreamReader =
|
|
## Create new AsyncStreamReader object, which will use stream transport
|
|
## ``tsource`` as source data channel.
|
|
var res = AsyncStreamReader()
|
|
res.init(tsource)
|
|
res
|
|
|
|
proc newAsyncStreamWriter*[T](wsource: AsyncStreamWriter,
|
|
loop: StreamWriterLoop,
|
|
queueSize = AsyncStreamDefaultQueueSize,
|
|
udata: ref T): AsyncStreamWriter =
|
|
## Create new AsyncStreamWriter object which will use other AsyncStreamWriter
|
|
## object ``wsource`` as data channel.
|
|
##
|
|
## ``loop`` is main writing loop procedure.
|
|
##
|
|
## ``queueSize`` is writing queue size (default size is unlimited).
|
|
##
|
|
## ``udata`` - user object which will be associated with new AsyncStreamWriter
|
|
## object.
|
|
var res = AsyncStreamWriter()
|
|
res.init(wsource, loop, queueSize, udata)
|
|
res
|
|
|
|
proc newAsyncStreamWriter*(wsource: AsyncStreamWriter,
|
|
loop: StreamWriterLoop,
|
|
queueSize = AsyncStreamDefaultQueueSize
|
|
): AsyncStreamWriter =
|
|
## Create new AsyncStreamWriter object which will use other AsyncStreamWriter
|
|
## object ``wsource`` as data channel.
|
|
##
|
|
## ``loop`` is main writing loop procedure.
|
|
##
|
|
## ``queueSize`` is writing queue size (default size is unlimited).
|
|
var res = AsyncStreamWriter()
|
|
res.init(wsource, loop, queueSize)
|
|
res
|
|
|
|
proc newAsyncStreamWriter*[T](tsource: StreamTransport,
|
|
udata: ref T): AsyncStreamWriter =
|
|
## Create new AsyncStreamWriter object which will use stream transport
|
|
## ``tsource`` as data channel.
|
|
##
|
|
## ``udata`` - user object which will be associated with new AsyncStreamWriter
|
|
## object.
|
|
var res = AsyncStreamWriter()
|
|
res.init(tsource, udata)
|
|
res
|
|
|
|
proc newAsyncStreamWriter*(tsource: StreamTransport): AsyncStreamWriter =
|
|
## Create new AsyncStreamWriter object which will use stream transport
|
|
## ``tsource`` as data channel.
|
|
var res = AsyncStreamWriter()
|
|
res.init(tsource)
|
|
res
|
|
|
|
proc newAsyncStreamWriter*[T](wsource: AsyncStreamWriter,
|
|
udata: ref T): AsyncStreamWriter =
|
|
## Create copy of AsyncStreamWriter object ``wsource``.
|
|
##
|
|
## ``udata`` - user object which will be associated with new AsyncStreamWriter
|
|
## object.
|
|
var res = AsyncStreamWriter()
|
|
res.init(wsource, udata)
|
|
res
|
|
|
|
proc newAsyncStreamWriter*(wsource: AsyncStreamWriter): AsyncStreamWriter =
|
|
## Create copy of AsyncStreamWriter object ``wsource``.
|
|
var res = AsyncStreamWriter()
|
|
res.init(wsource)
|
|
res
|
|
|
|
proc newAsyncStreamReader*[T](rsource: AsyncStreamWriter,
|
|
udata: ref T): AsyncStreamWriter =
|
|
## Create copy of AsyncStreamReader object ``rsource``.
|
|
##
|
|
## ``udata`` - user object which will be associated with new AsyncStreamReader
|
|
## object.
|
|
var res = AsyncStreamReader()
|
|
res.init(rsource, udata)
|
|
res
|
|
|
|
proc newAsyncStreamReader*(rsource: AsyncStreamReader): AsyncStreamReader =
|
|
## Create copy of AsyncStreamReader object ``rsource``.
|
|
var res = AsyncStreamReader()
|
|
res.init(rsource)
|
|
res
|
|
|
|
proc getUserData*[T](rw: AsyncStreamRW): T {.inline.} =
|
|
## Obtain user data associated with AsyncStreamReader or AsyncStreamWriter
|
|
## object ``rw``.
|
|
cast[T](rw.udata)
|