libp2p/stream/lpstream

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Length Prefixed stream implementation

Types

Direction {.pure.} = enum
  In, Out
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LPStream = ref object of RootObj
  closeEvent*: AsyncEvent
  isClosed*: bool
  isEof*: bool
  objName*: string
  oid*: Oid
  dir*: Direction
  closedWithEOF: bool
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LPStreamError = object of LPError
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LPStreamIncorrectDefect = object of Defect
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LPStreamReadError = object of LPStreamError
  par*: ref CatchableError
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LPStreamWriteError = object of LPStreamError
  par*: ref CatchableError
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MaxSizeError = object of LPStreamError
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StreamTracker = ref object of TrackerBase
  opened*: uint64
  closed*: uint64
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Consts

Eof = []
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LPStreamTrackerName = "LPStream"
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Procs

proc closeWithEOF(s: LPStream): Future[void] {.public(), stackTrace: false,
    ...raises: [], gcsafe, gcsafe, raises: [], gcsafe, raises: [],
    tags: [RootEffect].}

Close the stream and wait for EOF - use this with half-closed streams where an EOF is expected to arrive from the other end.

Note - this should only be used when there has been an in-protocol notification that no more data will arrive and that the only thing left for the other end to do is to close the stream gracefully.

In particular, it must not be used when there is another concurrent read ongoing (which may be the case during cancellations)!

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proc join(s: LPStream): InternalRaisesFuture[void, (CancelledError,)] {.
    public(), stackTrace: false, ...raises: [], gcsafe, gcsafe, raises: [], gcsafe,
    raises: [], tags: [].}
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proc newLPStreamClosedError(): ref LPStreamClosedError {....gcsafe, raises: [],
    tags: [].}
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proc newLPStreamConnDownError(parentException: ref Exception = nil): ref LPStreamConnDownError {.
    ...gcsafe, raises: [], tags: [].}
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proc newLPStreamEOFError(): ref LPStreamEOFError {....gcsafe, raises: [], tags: [].}
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proc newLPStreamIncompleteError(): ref LPStreamIncompleteError {....gcsafe,
    raises: [], tags: [].}
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proc newLPStreamIncorrectDefect(m: string): ref LPStreamIncorrectDefect {.
    ...gcsafe, raises: [], tags: [].}
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proc newLPStreamLimitError(): ref LPStreamLimitError {....gcsafe, raises: [],
    tags: [].}
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proc newLPStreamReadError(msg: string): ref LPStreamReadError {....gcsafe,
    raises: [], tags: [].}
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proc newLPStreamReadError(p: ref CatchableError): ref LPStreamReadError {.
    ...gcsafe, raises: [], tags: [].}
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proc newLPStreamRemoteClosedError(): ref LPStreamRemoteClosedError {....gcsafe,
    raises: [], tags: [].}
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proc newLPStreamResetError(): ref LPStreamResetError {....gcsafe, raises: [],
    tags: [].}
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proc newLPStreamWriteError(p: ref CatchableError): ref LPStreamWriteError {.
    ...gcsafe, raises: [], tags: [].}
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proc readExactly(s: LPStream; pbytes: pointer; nbytes: int): Future[void] {.
    public(), stackTrace: false, ...raises: [], gcsafe, gcsafe, raises: [], gcsafe,
    raises: [], tags: [RootEffect].}
Waits for nbytes to be available, then read them and return them   Source   Edit 
proc readLine(s: LPStream; limit = 0; sep = "\r\n"): Future[string] {.public(),
    stackTrace: false, ...raises: [], gcsafe, gcsafe, raises: [], gcsafe,
    raises: [], tags: [RootEffect].}
Reads up to limit bytes are read, or a sep is found   Source   Edit 
proc readLp(s: LPStream; maxSize: int): Future[seq[byte]] {.public(),
    stackTrace: false, ...raises: [], gcsafe, gcsafe, raises: [], gcsafe,
    raises: [], tags: [RootEffect].}
read length prefixed msg, with the length encoded as a varint   Source   Edit 
proc readVarint(conn: LPStream): Future[uint64] {.public(), stackTrace: false,
    ...raises: [], gcsafe, gcsafe, raises: [], gcsafe, raises: [],
    tags: [RootEffect].}
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proc setupStreamTracker(name: string): StreamTracker {....gcsafe, raises: [],
    tags: [].}
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func shortLog(s: LPStream): auto {....gcsafe, raises: [], tags: [].}
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proc write(s: LPStream; msg: string): Future[void] {.public, ...gcsafe, raises: [],
    tags: [].}
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proc writeLp(s: LPStream; msg: openArray[byte]): Future[void] {.public, ...gcsafe,
    raises: [], tags: [].}
Write msg with a varint-encoded length prefix   Source   Edit 
proc writeLp(s: LPStream; msg: string): Future[void] {.public, ...gcsafe,
    raises: [], tags: [].}
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Methods

method atEof(s: LPStream): bool {.base, public, ...gcsafe, raises: [], tags: [].}
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method close(s: LPStream): Future[void] {.base, public(), stackTrace: false,
    ...raises: [], gcsafe, gcsafe, raises: [], gcsafe, raises: [],
    tags: [RootEffect].}
close the stream - this may block, but will not raise exceptions   Source   Edit 
method closed(s: LPStream): bool {.base, public, ...gcsafe, raises: [], tags: [].}
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method closeImpl(s: LPStream): Future[void] {.base, stackTrace: false,
    ...raises: [], gcsafe, gcsafe, raises: [], gcsafe, raises: [],
    tags: [RootEffect].}
Implementation of close - called only once   Source   Edit 
method initStream(s: LPStream) {.base, ...gcsafe, raises: [], tags: [TimeEffect].}
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method readOnce(s: LPStream; pbytes: pointer; nbytes: int): Future[int] {.base,
    public(), stackTrace: false, ...raises: [], gcsafe, gcsafe, raises: [], gcsafe,
    raises: [], tags: [RootEffect].}
Reads whatever is available in the stream, up to nbytes. Will block if nothing is available   Source   Edit 
method write(s: LPStream; msg: seq[byte]): Future[void] {.base, public, ...gcsafe,
    raises: [], tags: [].}
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Templates

template formatItIMPL(it: LPStream): auto
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Made with Nim. Generated: 2024-03-02 21:51:11 UTC