88 lines
2.8 KiB
Nim
88 lines
2.8 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 options
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import chronos
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import chronicles
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import ../protocol,
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../../stream/bufferstream,
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../../crypto/crypto,
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../../connection,
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../../peerinfo,
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../../utility
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type
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Secure* = ref object of LPProtocol # base type for secure managers
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SecureConn* = ref object of Connection
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method readMessage*(c: SecureConn): Future[seq[byte]] {.async, base.} =
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doAssert(false, "Not implemented!")
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method writeMessage*(c: SecureConn, data: seq[byte]) {.async, base.} =
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doAssert(false, "Not implemented!")
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method handshake(s: Secure,
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conn: Connection,
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initiator: bool = false): Future[SecureConn] {.async, base.} =
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doAssert(false, "Not implemented!")
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proc readLoop(sconn: SecureConn, stream: BufferStream) {.async.} =
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try:
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while not sconn.closed:
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let msg = await sconn.readMessage()
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if msg.len == 0:
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trace "stream EOF"
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return
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await stream.pushTo(msg)
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except CatchableError as exc:
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trace "exception occurred SecioConn.readLoop", exc = exc.msg
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finally:
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if not sconn.closed:
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await sconn.close()
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trace "ending secio readLoop", isclosed = sconn.closed()
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proc handleConn*(s: Secure, conn: Connection, initiator: bool = false): Future[Connection] {.async, gcsafe.} =
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var sconn = await s.handshake(conn, initiator)
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proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
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trace "sending encrypted bytes", bytes = data.shortLog
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await sconn.writeMessage(data)
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var stream = newBufferStream(writeHandler)
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asyncCheck readLoop(sconn, stream)
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result = newConnection(stream)
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result.closeEvent.wait()
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.addCallback do (udata: pointer):
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trace "wrapped connection closed, closing upstream"
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if not isNil(sconn) and not sconn.closed:
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asyncCheck sconn.close()
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result.peerInfo = PeerInfo.init(sconn.peerInfo.publicKey.get())
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method init*(s: Secure) {.gcsafe.} =
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proc handle(conn: Connection, proto: string) {.async, gcsafe.} =
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trace "handling connection"
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try:
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asyncCheck s.handleConn(conn, false)
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trace "connection secured"
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except CatchableError as exc:
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if not conn.closed():
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warn "securing connection failed", msg = exc.msg
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await conn.close()
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s.handler = handle
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method secure*(s: Secure, conn: Connection): Future[Connection] {.async, base, gcsafe.} =
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try:
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result = await s.handleConn(conn, true)
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except CatchableError as exc:
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warn "securing connection failed", msg = exc.msg
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if not conn.closed():
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await conn.close()
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