92 lines
2.6 KiB
Nim
92 lines
2.6 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, strutils
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import chronos
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import connection, varint, vbuffer
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const MsgSize* = 64*1024
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const Codec* = "/multistream/1.0.0"
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const MultiCodec* = Codec & "\n"
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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, s: var seq[byte]): int =
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var buf = initVBuffer(s)
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buf.writeSeq(data)
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buf.finish()
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s = buf.buffer
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proc newMultistream*(): MultisteamSelect =
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new result
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result.codec = newSeq[byte]()
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discard lp(MultiCodec, result.codec)
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result.na = newSeq[byte]()
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discard lp(Na, result.na)
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result.ls = newSeq[byte]()
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discard lp(Ls, result.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) # write handshake
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await conn.writeLp(proto) # select proto
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var ms = cast[string](await conn.readLp())
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echo MultiCodec
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if ms != MultiCodec:
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raise newException(MultisteamSelectException,
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"Error: invalid multistream codec " & "\"" & ms & "\"")
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var msProto = cast[string](await conn.readLp())
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msProto.removeSuffix("\n")
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result = msProto == proto
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proc ls*(m: MultisteamSelect): Future[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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# await conn.write(m.codec)
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# let ms = await conn.readLine(0, "\n")
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# if ms != MultiCodec:
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# raise newException(MultisteamSelectException,
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# "Error: invalid multistream codec " & "\"" & $ms & "\"")
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# let ms = await conn.readLine(0, "\n")
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proc addHandler*(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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