nim-libp2p/libp2p/protocols/secure/secure.nim

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## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import options
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import chronos
import chronicles
import secureconn,
../protocol,
../../stream/bufferstream,
../../crypto/crypto,
../../connection,
../../peerinfo
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type
Secure* = ref object of LPProtocol # base type for secure managers
method handshake(s: Secure,
conn: Connection,
initiator: bool = true): Future[SecureConn] {.async, base.} =
doAssert(false, "Not implemented!")
proc readLoop(sconn: SecureConn, stream: BufferStream) {.async.} =
try:
while not sconn.closed:
let msg = await sconn.readMessage()
if msg.len == 0:
trace "stream EOF"
return
await stream.pushTo(msg)
except CatchableError as exc:
trace "exception occurred SecioConn.readLoop", exc = exc.msg
finally:
if not sconn.closed:
await sconn.close()
trace "ending secio readLoop", isclosed = sconn.closed()
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proc handleConn*(s: Secure, conn: Connection): Future[Connection] {.async, gcsafe.} =
var sconn = await s.handshake(conn)
proc writeHandler(data: seq[byte]) {.async, gcsafe.} =
trace "sending encrypted bytes", bytes = data.toHex()
await sconn.writeMessage(data)
var stream = newBufferStream(writeHandler)
asyncCheck readLoop(sconn, stream)
result = newConnection(stream)
result.closeEvent.wait()
.addCallback do (udata: pointer):
trace "wrapped connection closed, closing upstream"
if not isNil(sconn) and not sconn.closed:
asyncCheck sconn.close()
result.peerInfo = PeerInfo.init(sconn.peerInfo.publicKey.get())
method init*(s: Secure) {.gcsafe.} =
proc handle(conn: Connection, proto: string) {.async, gcsafe.} =
trace "handling connection"
try:
asyncCheck s.handleConn(conn)
trace "connection secured"
except CatchableError as exc:
if not conn.closed():
warn "securing connection failed", msg = exc.msg
await conn.close()
s.handler = handle
method secure*(p: Secure, conn: Connection): Future[Connection]
{.base, async, gcsafe.} =
## default implementation matches plaintext
var retFuture = newFuture[Connection]("secure.secure")
retFuture.complete(conn)
return retFuture