124 lines
4.1 KiB
Nim
124 lines
4.1 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 oids
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import chronicles, chronos
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type
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LPStream* = ref object of RootObj
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isClosed*: bool
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closeEvent*: AsyncEvent
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when chronicles.enabledLogLevel == LogLevel.TRACE:
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oid*: Oid
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LPStreamError* = object of CatchableError
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LPStreamIncompleteError* = object of LPStreamError
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LPStreamIncorrectDefect* = object of Defect
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LPStreamLimitError* = object of LPStreamError
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LPStreamReadError* = object of LPStreamError
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par*: ref Exception
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LPStreamWriteError* = object of LPStreamError
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par*: ref Exception
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LPStreamEOFError* = object of LPStreamError
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proc newLPStreamReadError*(p: ref Exception): ref Exception =
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var w = newException(LPStreamReadError, "Read stream failed")
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w.msg = w.msg & ", originated from [" & $p.name & "] " & p.msg
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w.par = p
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result = w
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proc newLPStreamReadError*(msg: string): ref Exception =
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newException(LPStreamReadError, msg)
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proc newLPStreamWriteError*(p: ref Exception): ref Exception =
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var w = newException(LPStreamWriteError, "Write stream failed")
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w.msg = w.msg & ", originated from [" & $p.name & "] " & p.msg
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w.par = p
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result = w
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proc newLPStreamIncompleteError*(): ref Exception =
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result = newException(LPStreamIncompleteError, "Incomplete data received")
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proc newLPStreamLimitError*(): ref Exception =
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result = newException(LPStreamLimitError, "Buffer limit reached")
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proc newLPStreamIncorrectDefect*(m: string): ref Exception =
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result = newException(LPStreamIncorrectDefect, m)
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proc newLPStreamEOFError*(): ref Exception =
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result = newException(LPStreamEOFError, "Stream EOF!")
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method closed*(s: LPStream): bool {.base, inline.} =
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s.isClosed
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method readExactly*(s: LPStream,
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pbytes: pointer,
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nbytes: int):
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Future[void] {.base, async.} =
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doAssert(false, "not implemented!")
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method readOnce*(s: LPStream,
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pbytes: pointer,
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nbytes: int):
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Future[int]
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{.base, async.} =
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doAssert(false, "not implemented!")
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proc read*(s: LPStream, nbytes: int): Future[seq[byte]] {.async, deprecated: "readExactly".} =
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# This function is deprecated - it was broken and used inappropriately as
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# `readExacltly` in tests and code - tests still need refactoring to remove
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# any calls
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# `read` without nbytes was also incorrectly implemented - it worked more
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# like `readOnce` in that it would not wait for stream to close, in
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# BufferStream in particular - both tests and implementation were broken
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var ret = newSeq[byte](nbytes)
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await readExactly(s, addr ret[0], ret.len)
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return ret
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proc readLine*(s: LPStream, limit = 0, sep = "\r\n"): Future[string] {.async, deprecated: "todo".} =
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# TODO replace with something that exploits buffering better
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var lim = if limit <= 0: -1 else: limit
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var state = 0
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try:
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while true:
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var ch: char
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await readExactly(s, addr ch, 1)
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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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if limit > 0:
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let missing = min(state, lim - len(result) - 1)
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result.add(sep[0 ..< missing])
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else:
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result.add(sep[0 ..< state])
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result.add(ch)
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if len(result) == lim:
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break
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except LPStreamIncompleteError, LPStreamReadError:
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discard # EOF, in which case we should return whatever we read so far..
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method write*(s: LPStream, msg: seq[byte]) {.base, async.} =
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doAssert(false, "not implemented!")
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proc write*(s: LPStream, pbytes: pointer, nbytes: int): Future[void] {.deprecated: "seq".} =
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s.write(@(toOpenArray(cast[ptr UncheckedArray[byte]](pbytes), 0, nbytes - 1)))
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proc write*(s: LPStream, msg: string): Future[void] =
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s.write(@(toOpenArrayByte(msg, 0, msg.high)))
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method close*(s: LPStream)
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{.base, async.} =
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doAssert(false, "not implemented!")
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