100 lines
3.0 KiB
Nim
100 lines
3.0 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2018 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
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import peerinfo, multiaddress, stream, peerinfo, varint, vbuffer
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const DefaultReadSize: uint = 64*1024
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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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proc newConnection*(stream: LPStream): 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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method read*(s: Connection, n = -1): Future[seq[byte]] {.async.} =
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result = await s.stream.read(n)
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method readExactly*(s: Connection,
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pbytes: pointer,
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nbytes: int): Future[void] {.async.} =
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await s.stream.readExactly(pbytes, nbytes)
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method readLine*(s: Connection,
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limit = 0,
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sep = "\r\n"): Future[string] {.async.} =
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result = await s.stream.readLine(limit, sep)
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method readOnce*(s: Connection,
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pbytes: pointer,
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nbytes: int): Future[int] {.async.} =
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result = await s.stream.readOnce(pbytes, nbytes)
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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]): Future[int] {.async.} =
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result = await s.stream.readUntil(pbytes, nbytes, sep)
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method write*(s: Connection, pbytes: pointer, nbytes: int) {.async.} =
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await s.stream.write(pbytes, nbytes)
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method write*(s: Connection, msg: string, msglen = -1) {.async.} =
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await s.stream.write(msg, msglen)
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method write*(s: Connection, msg: seq[byte], msglen = -1) {.async.} =
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await s.stream.write(msg, msglen)
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method close*(s: Connection) {.async.} =
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await s.stream.close()
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s.closed = true
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proc readLp*(s: Connection): Future[seq[byte]] {.async.} =
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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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var buffer = newSeq[byte](10)
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try:
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for i in 0..<len(buffer):
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await s.readExactly(addr buffer[i], 1)
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res = LP.getUVarint(buffer.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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buffer.setLen(0)
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buffer.setLen(size)
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await s.readExactly(addr buffer[0], int(size))
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except TransportIncompleteError:
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buffer.setLen(0)
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result = buffer
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proc writeLp*(s: Connection, msg: string | seq[byte]) {.async.} =
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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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result = s.write(buf.buffer)
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method getPeerInfo* (c: Connection): Future[PeerInfo] {.base, async.} =
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## get up to date peer info
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## TODO: implement PeerInfo refresh over identify
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discard
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method getObservedAddrs(c: Connection): Future[seq[MultiAddress]] {.base,
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async.} =
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## get resolved multiaddresses for the connection
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discard
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