mirror of https://github.com/vacp2p/nim-libp2p.git
77 lines
2.2 KiB
Nim
77 lines
2.2 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 sequtils
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import chronos
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import connection, varint, vbuffer
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const Codec* = "/multistream/1.0.0"
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const Na = "na\n"
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const Ls = "ls\n"
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type
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MultisteamSelectException = object of CatchableError
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Handler* = proc (conn: Connection, proto: string): Future[void]
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Matcher* = proc (proto: string): bool
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HandlerHolder* = object
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proto: string
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handler: Handler
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match: Matcher
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MultisteamSelect* = ref object of RootObj
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handlers*: seq[HandlerHolder]
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codec*: seq[byte]
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na*: seq[byte]
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ls*: seq[byte]
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proc lp*(data: string): seq[byte] =
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var buf = initVBuffer(newSeq[byte](256))
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buf.writeSeq(data)
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var lpData = newSeq[byte](buf.length)
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if buf.readSeq(lpData) < 0:
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raise newException(MultisteamSelectException, "Error: failed to lenght prefix")
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result = lpData
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proc newMultistream*(): MultisteamSelect =
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new result
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result.codec = lp(Codec & "\n")
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result.na = lp(Na)
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result.ls = lp(Ls)
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proc select*(m: MultisteamSelect, conn: Connection, proto: string): Future[bool] {.async.} =
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## select a remote protocol
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await conn.write(m.codec)
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await conn.write(lp(proto)) # select proto
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let ms = await conn.readLine(0, "\n")
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if ms != Codec:
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raise newException(MultisteamSelectException, "Error: invalid multistream codec" & $ms)
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let remote = await conn.readLine(0, "\n")
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result = remote == proto
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proc ls*(m: MultisteamSelect): seq[string] {.async.} =
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## list all remote protocol strings
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discard
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proc handle*(m: MultisteamSelect, conn: Connection) {.async.} =
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## handle requests on connection
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discard
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proc addHandle*(m: MultisteamSelect,
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proto: string,
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handler: Handler,
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matcher: Matcher = nil) =
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## register a handler for the protocol
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m.handlers.add(HandlerHolder(proto: proto,
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handler: handler,
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match: matcher))
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