84 lines
2.4 KiB
Nim
84 lines
2.4 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
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import nimcrypto/utils, chronicles
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import types,
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../../connection,
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../../varint,
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../../vbuffer,
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../../stream/lpstream
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logScope:
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topic = "MplexCoder"
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const DefaultChannelSize* = 1 shr 20
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type
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Msg* = tuple
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id: uint
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msgType: MessageType
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data: seq[byte]
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proc readMplexVarint(conn: Connection): Future[uint] {.async, gcsafe.} =
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var
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varint: uint
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length: int
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res: VarintStatus
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buffer = newSeq[byte](10)
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try:
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for i in 0..<len(buffer):
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await conn.readExactly(addr buffer[i], 1)
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res = PB.getUVarint(buffer.toOpenArray(0, i), length, varint)
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if res == VarintStatus.Success:
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break
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if res != VarintStatus.Success:
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raise newInvalidVarintException()
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if varint.int > DefaultReadSize:
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raise newInvalidVarintSizeException()
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return varint
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except LPStreamIncompleteError as exc:
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trace "unable to read varint", exc = exc.msg
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raise exc
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proc readMsg*(conn: Connection): Future[Msg] {.async, gcsafe.} =
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let headerVarint = await conn.readMplexVarint()
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trace "read header varint", varint = headerVarint
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let dataLenVarint = await conn.readMplexVarint()
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trace "read data len varing", varint = dataLenVarint
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var data: seq[byte]
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if dataLenVarint.int > 0:
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data = await conn.read(dataLenVarint.int)
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trace "read data", data = data
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let header = headerVarint
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result = (header shr 3, MessageType(header and 0x7), data)
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proc writeMsg*(conn: Connection,
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id: uint,
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msgType: MessageType,
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data: seq[byte] = @[]) {.async, gcsafe.} =
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## write lenght prefixed
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var buf = initVBuffer()
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buf.writePBVarint(id shl 3 or ord(msgType).uint)
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buf.writePBVarint(data.len().uint) # size should be always sent
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buf.finish()
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try:
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await conn.write(buf.buffer & data)
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except LPStreamIncompleteError as exc:
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trace "unable to send message", exc = exc.msg
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proc writeMsg*(conn: Connection,
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id: uint,
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msgType: MessageType,
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data: string) {.async, gcsafe.} =
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result = conn.writeMsg(id, msgType, cast[seq[byte]](data))
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