150 lines
4.6 KiB
Nim
150 lines
4.6 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 chronos, chronicles
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import peerinfo,
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multiaddress,
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stream/lpstream,
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peerinfo,
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varint,
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vbuffer
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const DefaultReadSize*: uint = 64 * 1024
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const DefaultRWTimeout*: Duration = 2.minutes
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type
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Connection* = ref object of LPStream
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peerInfo*: PeerInfo
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stream*: LPStream
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observedAddrs*: Multiaddress
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timeout*: Duration
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InvalidVarintException = object of LPStreamError
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proc newInvalidVarintException*(): ref InvalidVarintException =
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newException(InvalidVarintException, "unable to prase varint")
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proc newConnection*(stream: LPStream,
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timeout: Duration = DefaultRWTimeout): Connection =
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## create a new Connection for the specified async reader/writer
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new result
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result.stream = stream
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result.closeEvent = newAsyncEvent()
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result.timeout = timeout
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# bind stream's close event to connection's close
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# to ensure correct close propagation
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let this = result
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if not isNil(result.stream.closeEvent):
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result.stream.closeEvent.wait().
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addCallback do (udata: pointer):
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if not this.closed:
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trace "closing this connection because wrapped stream closed"
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asyncCheck this.close()
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method read*(s: Connection, n = -1): Future[seq[byte]] {.gcsafe.} =
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wait(s.stream.read(n), s.timeout)
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method readExactly*(s: Connection,
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pbytes: pointer,
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nbytes: int):
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Future[void] {.gcsafe.} =
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wait(s.stream.readExactly(pbytes, nbytes), s.timeout)
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method readLine*(s: Connection,
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limit = 0,
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sep = "\r\n"):
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Future[string] {.gcsafe.} =
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wait(s.stream.readLine(limit, sep), s.timeout)
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method readOnce*(s: Connection,
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pbytes: pointer,
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nbytes: int):
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Future[int] {.gcsafe.} =
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wait(s.stream.readOnce(pbytes, nbytes), s.timeout)
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method readUntil*(s: Connection,
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pbytes: pointer,
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nbytes: int,
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sep: seq[byte]):
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Future[int] {.gcsafe.} =
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wait(s.stream.readUntil(pbytes, nbytes, sep), s.timeout)
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method write*(s: Connection,
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pbytes: pointer,
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nbytes: int):
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Future[void] {.gcsafe.} =
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wait(s.stream.write(pbytes, nbytes), s.timeout)
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method write*(s: Connection,
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msg: string,
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msglen = -1):
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Future[void] {.gcsafe.} =
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wait(s.stream.write(msg, msglen), s.timeout)
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method write*(s: Connection,
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msg: seq[byte],
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msglen = -1):
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Future[void] {.gcsafe.} =
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wait(s.stream.write(msg, msglen), s.timeout)
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method closed*(s: Connection): bool =
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if isNil(s.stream):
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return false
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result = s.stream.closed
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method close*(s: Connection) {.async, gcsafe.} =
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trace "closing connection"
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if not s.closed:
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if not isNil(s.stream) and not s.stream.closed:
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await s.stream.close()
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s.closeEvent.fire()
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s.isClosed = true
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trace "connection closed", closed = s.closed
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proc readLp*(s: Connection): Future[seq[byte]] {.async, gcsafe.} =
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## read lenght prefixed msg
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var
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size: uint
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length: int
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res: VarintStatus
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result = newSeq[byte](10)
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try:
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for i in 0..<len(result):
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await s.readExactly(addr result[i], 1)
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res = LP.getUVarint(result.toOpenArray(0, i), length, size)
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if res == VarintStatus.Success:
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break
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if res != VarintStatus.Success or size > DefaultReadSize:
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raise newInvalidVarintException()
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result.setLen(size)
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if size > 0.uint:
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trace "reading exact bytes from stream", size = size
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await s.readExactly(addr result[0], int(size))
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except LPStreamIncompleteError as exc:
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trace "remote connection ended unexpectedly", exc = exc.msg
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except LPStreamReadError as exc:
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trace "couldn't read from stream", exc = exc.msg
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proc writeLp*(s: Connection, msg: string | seq[byte]): Future[void] {.gcsafe.} =
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## write lenght prefixed
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var buf = initVBuffer()
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buf.writeSeq(msg)
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buf.finish()
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s.write(buf.buffer)
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method getObservedAddrs*(c: Connection): Future[MultiAddress] {.base, async, gcsafe.} =
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## get resolved multiaddresses for the connection
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result = c.observedAddrs
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proc `$`*(conn: Connection): string =
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if not isNil(conn.peerInfo):
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result = $(conn.peerInfo)
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