2019-08-27 21:46:12 +00:00
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## Nim-LibP2P
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2019-09-24 17:48:23 +00:00
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## Copyright (c) 2019 Status Research & Development GmbH
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2019-08-27 21:46:12 +00:00
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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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2020-02-21 01:14:39 +00:00
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import tables, sequtils, options, strformat, sets
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2019-09-09 17:33:32 +00:00
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import chronos, chronicles
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2019-09-11 19:03:30 +00:00
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import connection,
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transports/transport,
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multistream,
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2019-09-06 07:13:47 +00:00
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protocols/protocol,
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2019-09-14 13:55:52 +00:00
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protocols/secure/secure,
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protocols/secure/plaintext, # for plain text
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2019-09-11 19:03:30 +00:00
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peerinfo,
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protocols/identify,
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protocols/pubsub/pubsub,
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2019-09-06 07:13:47 +00:00
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muxers/muxer,
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2020-04-11 04:08:25 +00:00
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errors,
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2019-09-09 17:33:32 +00:00
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peer
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2019-08-28 19:12:15 +00:00
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2019-09-12 02:10:38 +00:00
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logScope:
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topic = "Switch"
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2019-12-04 04:44:54 +00:00
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#TODO: General note - use a finite state machine to manage the different
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2019-12-08 21:06:58 +00:00
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# steps of connections establishing and upgrading. This makes everything
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# more robust and less prone to ordering attacks - i.e. muxing can come if
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# and only if the channel has been secured (i.e. if a secure manager has been
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2019-12-04 04:44:54 +00:00
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# previously provided)
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2019-08-28 19:12:15 +00:00
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type
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2019-09-11 19:03:30 +00:00
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NoPubSubException = object of CatchableError
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2019-08-28 19:12:15 +00:00
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Switch* = ref object of RootObj
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2019-08-30 05:17:07 +00:00
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peerInfo*: PeerInfo
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2019-09-13 18:41:48 +00:00
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connections*: Table[string, Connection]
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muxed*: Table[string, Muxer]
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2019-08-30 05:17:07 +00:00
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transports*: seq[Transport]
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protocols*: seq[LPProtocol]
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2019-09-04 22:00:39 +00:00
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muxers*: Table[string, MuxerProvider]
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2020-02-04 16:16:21 +00:00
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ms*: MultistreamSelect
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2019-09-04 01:50:17 +00:00
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identity*: Identify
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2019-09-06 07:13:47 +00:00
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streamHandler*: StreamHandler
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2019-09-13 18:41:48 +00:00
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secureManagers*: Table[string, Secure]
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2019-09-11 19:03:30 +00:00
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pubSub*: Option[PubSub]
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2020-02-21 01:14:39 +00:00
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dialedPubSubPeers: HashSet[string]
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2019-09-11 19:03:30 +00:00
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2019-12-08 21:06:58 +00:00
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proc newNoPubSubException(): ref Exception {.inline.} =
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2019-09-11 19:03:30 +00:00
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result = newException(NoPubSubException, "no pubsub provided!")
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2019-08-27 21:46:12 +00:00
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2019-12-08 21:06:58 +00:00
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proc secure(s: Switch, conn: Connection): Future[Connection] {.async, gcsafe.} =
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2019-09-06 07:13:47 +00:00
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## secure the incoming connection
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2019-09-04 22:00:39 +00:00
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2019-09-13 18:41:48 +00:00
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let managers = toSeq(s.secureManagers.keys)
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2019-09-09 23:17:45 +00:00
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if managers.len == 0:
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raise newException(CatchableError, "No secure managers registered!")
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2019-09-13 18:41:48 +00:00
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let manager = await s.ms.select(conn, toSeq(s.secureManagers.values).mapIt(it.codec))
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if manager.len == 0:
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2019-09-06 07:13:47 +00:00
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raise newException(CatchableError, "Unable to negotiate a secure channel!")
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2019-09-09 23:17:45 +00:00
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2020-04-23 01:27:29 +00:00
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result = await s.secureManagers[manager].secure(conn, true)
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2019-08-31 17:58:49 +00:00
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2019-09-28 19:54:32 +00:00
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proc identify(s: Switch, conn: Connection): Future[PeerInfo] {.async, gcsafe.} =
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2019-09-04 01:50:17 +00:00
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## identify the connection
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2019-09-28 19:54:32 +00:00
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2019-12-10 20:50:35 +00:00
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if not isNil(conn.peerInfo):
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result = conn.peerInfo
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2019-12-07 16:36:39 +00:00
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2019-09-06 07:13:47 +00:00
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try:
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if (await s.ms.select(conn, s.identity.codec)):
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let info = await s.identity.identify(conn, conn.peerInfo)
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2019-12-10 20:50:35 +00:00
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if info.pubKey.isNone and isNil(result):
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raise newException(CatchableError,
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"no public key provided and no existing peer identity found")
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2019-09-28 19:54:32 +00:00
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if info.pubKey.isSome:
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2019-12-07 16:36:39 +00:00
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result = PeerInfo.init(info.pubKey.get())
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2019-12-04 04:44:54 +00:00
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trace "identify: identified remote peer", peer = result.id
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2019-09-28 19:54:32 +00:00
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if info.addrs.len > 0:
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result.addrs = info.addrs
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2019-12-04 04:44:54 +00:00
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2019-09-28 19:54:32 +00:00
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if info.protos.len > 0:
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result.protocols = info.protos
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2019-09-06 07:13:47 +00:00
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except IdentityInvalidMsgError as exc:
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2019-09-23 21:51:28 +00:00
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error "identify: invalid message", msg = exc.msg
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2019-09-06 07:13:47 +00:00
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except IdentityNoMatchError as exc:
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2019-09-23 21:51:28 +00:00
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error "identify: peer's public keys don't match ", msg = exc.msg
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2019-09-06 07:13:47 +00:00
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2019-09-08 07:43:33 +00:00
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proc mux(s: Switch, conn: Connection): Future[void] {.async, gcsafe.} =
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2019-09-04 01:50:17 +00:00
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## mux incoming connection
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2019-09-28 19:54:32 +00:00
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trace "muxing connection"
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2019-09-04 22:00:39 +00:00
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let muxers = toSeq(s.muxers.keys)
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2019-09-13 20:04:46 +00:00
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if muxers.len == 0:
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2019-09-23 21:51:28 +00:00
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warn "no muxers registered, skipping upgrade flow"
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2019-09-13 20:04:46 +00:00
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return
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2019-09-04 22:00:39 +00:00
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let muxerName = await s.ms.select(conn, muxers)
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2019-09-06 07:13:47 +00:00
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if muxerName.len == 0 or muxerName == "na":
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2019-09-04 22:00:39 +00:00
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return
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2019-09-14 15:55:58 +00:00
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# create new muxer for connection
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2019-09-04 22:00:39 +00:00
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let muxer = s.muxers[muxerName].newMuxer(conn)
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# install stream handler
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2019-09-06 07:13:47 +00:00
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muxer.streamHandler = s.streamHandler
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2019-09-04 22:00:39 +00:00
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2019-09-14 15:55:58 +00:00
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# new stream for identify
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2019-12-04 04:44:54 +00:00
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var stream = await muxer.newStream()
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2019-09-08 07:43:33 +00:00
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let handlerFut = muxer.handle()
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# add muxer handler cleanup proc
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2019-12-08 21:06:58 +00:00
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handlerFut.addCallback do (udata: pointer = nil):
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trace "muxer handler completed for peer",
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2019-12-10 20:50:35 +00:00
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peer = conn.peerInfo.id
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2019-09-14 15:55:58 +00:00
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2019-09-28 19:54:32 +00:00
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# do identify first, so that we have a
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2019-09-14 15:55:58 +00:00
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# PeerInfo in case we didn't before
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2019-12-10 20:50:35 +00:00
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conn.peerInfo = await s.identify(stream)
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2019-12-04 04:44:54 +00:00
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await stream.close() # close identify stream
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2020-02-04 14:17:24 +00:00
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trace "connection's peerInfo", peerInfo = $conn.peerInfo
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2019-09-14 15:55:58 +00:00
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2019-09-05 15:19:39 +00:00
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# store it in muxed connections if we have a peer for it
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2019-12-10 20:50:35 +00:00
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if not isNil(conn.peerInfo):
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trace "adding muxer for peer", peer = conn.peerInfo.id
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s.muxed[conn.peerInfo.id] = muxer
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2019-09-04 22:00:39 +00:00
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2019-09-28 19:54:32 +00:00
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proc cleanupConn(s: Switch, conn: Connection) {.async, gcsafe.} =
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2019-12-10 20:50:35 +00:00
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if not isNil(conn.peerInfo):
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let id = conn.peerInfo.id
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trace "cleaning up connection for peer", peerId = id
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if id in s.muxed:
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await s.muxed[id].close()
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s.muxed.del(id)
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2019-12-04 04:44:54 +00:00
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2019-12-10 20:50:35 +00:00
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if id in s.connections:
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2019-12-13 15:25:07 +00:00
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if not s.connections[id].closed:
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await s.connections[id].close()
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2019-12-10 20:50:35 +00:00
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s.connections.del(id)
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2019-09-28 19:54:32 +00:00
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2020-02-21 14:25:09 +00:00
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s.dialedPubSubPeers.excl(id)
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2020-02-21 01:14:39 +00:00
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2020-02-11 17:53:39 +00:00
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# TODO: Investigate cleanupConn() always called twice for one peer.
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if not(conn.peerInfo.isClosed()):
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conn.peerInfo.close()
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2019-12-08 21:06:58 +00:00
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proc disconnect*(s: Switch, peer: PeerInfo) {.async, gcsafe.} =
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let conn = s.connections.getOrDefault(peer.id)
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2019-12-10 20:50:35 +00:00
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if not isNil(conn):
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2019-12-08 21:06:58 +00:00
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await s.cleanupConn(conn)
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2019-12-10 20:50:35 +00:00
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proc getMuxedStream(s: Switch, peerInfo: PeerInfo): Future[Connection] {.async, gcsafe.} =
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2019-09-28 19:54:32 +00:00
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# if there is a muxer for the connection
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# use it instead to create a muxed stream
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2019-12-04 04:44:54 +00:00
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if peerInfo.id in s.muxed:
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trace "connection is muxed, setting up a stream"
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let muxer = s.muxed[peerInfo.id]
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2019-09-28 19:54:32 +00:00
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let conn = await muxer.newStream()
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2019-12-10 20:50:35 +00:00
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result = conn
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2019-09-28 19:54:32 +00:00
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2019-09-12 12:02:25 +00:00
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proc upgradeOutgoing(s: Switch, conn: Connection): Future[Connection] {.async, gcsafe.} =
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2020-02-04 14:17:24 +00:00
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trace "handling connection", conn = $conn
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2019-09-06 07:13:47 +00:00
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result = conn
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2019-12-04 04:44:54 +00:00
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# don't mux/secure twise
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2019-12-10 20:50:35 +00:00
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if conn.peerInfo.id in s.muxed:
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2019-12-04 04:44:54 +00:00
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return
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result = await s.secure(result) # secure the connection
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2019-12-13 15:25:07 +00:00
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if isNil(result):
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return
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2019-09-08 07:43:33 +00:00
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await s.mux(result) # mux it if possible
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2019-12-10 20:50:35 +00:00
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s.connections[conn.peerInfo.id] = result
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2019-09-04 22:00:39 +00:00
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2019-12-08 21:06:58 +00:00
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proc upgradeIncoming(s: Switch, conn: Connection) {.async, gcsafe.} =
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Noise (#90)
* Start ChaCha20Poly1305 integration (BearSSL)
* Add Curve25519 (BearSSL) required operations for noise
* Fix curve mulgen iterate/derive
* Fix misleading header
* Add chachapoly proper test
* Curve25519 integration tests (failing, something is wrong)
* Add few converters, finish c25519 integration tests
* Remove implicit converters
* removed internal globals
* Start noise implementation
* Fix public() using proper bear mulgen
* Noise protocol WIP
* Noise progress
* Add a quick nim version of HKDF
* Converted hkdf to iterator, useful for noise
* Noise protocol implementation progress
* Noise progress
* XX handshake almost there
* noise progress
* Noise, testing handshake with test vectors
* Noise handshake progress, still wrong somewhere!
* Noise handshake success!
* Full verified noise XX handshake completed
* Fix and rewrite test to be similar to switch one
* Start with connection upgrade
* Switch chachapoly to CT implementations
* Improve HKDF implementation
* Use a type insted of tuple for HandshakeResult
* Remove unnecessary Let
* More cosmetic fixes
* Properly check randomBytes result
* Fix chachapoly signature
* Noise full circle (altho dispatcher is nil cursed)
* Allow nil aads in chachapoly routines
* Noise implementation up to running full test
* Use bearssl HKDF as well
* Directly use bearssl rng for curve25519 keys
* Add a (disabled/no CI) noise interop test server
* WIP on fixing interop issues
* More fixes in noise implementation for interop
* bump chronos requirement (nimble)
* Add a chachapoly test for very small size payloads
* Noise, more tracing
* Add 2 properly working noise tests
* Fix payload packing, following the spec properly (and not go version but
rather rust)
* Sanity, replace discard with asyncCheck
* Small fixes and optimization
* Use stew endian2 rather then system endian module
* Update nimble deps (chronos)
* Minor cosmetic/code sanity fixes
* Noise, handle Nonce max
* Noise tests, make sure to close secured conns
* More polish, improve code readability too
* More polish and testing again which test fails
* Further polishing
* Restore noise tests
* Remove useless Future[void]
* Remove useless CipherState initializer
* add a proper read wait future in second noise test
* Remove noise generic secure implementation for now
* Few fixes to run eth2 sim
* Add more debug info in noise traces
* Merge size + payload write in sendEncryptedMessage
* Revert secure interface, add outgoing property directly in newNoise
* remove sendEncrypted and receiveEncrypted
* Use openarray in chachapoly and curve25519 helpers
2020-03-17 12:30:01 +00:00
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trace "upgrading incoming connection", conn = $conn
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2019-09-28 19:54:32 +00:00
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let ms = newMultistream()
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2019-09-04 01:50:17 +00:00
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2019-09-28 19:54:32 +00:00
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# secure incoming connections
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proc securedHandler (conn: Connection,
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proto: string)
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{.async, gcsafe, closure.} =
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trace "Securing connection"
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let secure = s.secureManagers[proto]
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2020-04-23 01:27:29 +00:00
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let sconn = await secure.secure(conn, false)
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2019-09-28 19:54:32 +00:00
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if not isNil(sconn):
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# add the muxer
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for muxer in s.muxers.values:
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ms.addHandler(muxer.codec, muxer)
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# handle subsequent requests
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await ms.handle(sconn)
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2020-04-05 02:42:08 +00:00
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await sconn.close()
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2019-09-28 19:54:32 +00:00
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if (await ms.select(conn)): # just handshake
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# add the secure handlers
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for k in s.secureManagers.keys:
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ms.addHandler(k, securedHandler)
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# handle secured connections
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await ms.handle(conn)
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2019-09-11 19:03:30 +00:00
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2020-02-21 01:14:39 +00:00
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proc subscribeToPeer(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.}
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2020-02-25 22:13:05 +00:00
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proc internalConnect(s: Switch,
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peer: PeerInfo): Future[Connection] {.async.} =
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2019-12-04 04:44:54 +00:00
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let id = peer.id
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2019-12-08 21:06:58 +00:00
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trace "Dialing peer", peer = id
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2019-12-23 18:44:51 +00:00
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var conn = s.connections.getOrDefault(id)
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if conn.isNil or conn.closed:
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2019-12-08 21:06:58 +00:00
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for t in s.transports: # for each transport
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for a in peer.addrs: # for each address
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2019-12-23 18:44:51 +00:00
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if t.handles(a): # check if it can dial it
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2019-12-08 21:06:58 +00:00
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trace "Dialing address", address = $a
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2020-02-21 14:25:09 +00:00
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try:
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conn = await t.dial(a)
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except CatchableError as exc:
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trace "couldn't dial peer, transport failed", exc = exc.msg, address = a
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continue
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2019-12-04 04:44:54 +00:00
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# make sure to assign the peer to the connection
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2019-12-23 18:44:51 +00:00
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conn.peerInfo = peer
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conn = await s.upgradeOutgoing(conn)
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if isNil(conn):
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2019-12-13 15:25:07 +00:00
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continue
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2019-12-23 18:44:51 +00:00
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conn.closeEvent.wait()
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2019-12-13 15:25:07 +00:00
|
|
|
.addCallback do (udata: pointer):
|
2019-12-23 18:44:51 +00:00
|
|
|
asyncCheck s.cleanupConn(conn)
|
2019-12-09 17:17:29 +00:00
|
|
|
break
|
2019-12-08 21:06:58 +00:00
|
|
|
else:
|
|
|
|
trace "Reusing existing connection"
|
|
|
|
|
2020-03-29 14:28:48 +00:00
|
|
|
if not isNil(conn):
|
|
|
|
await s.subscribeToPeer(peer)
|
|
|
|
|
2020-02-25 22:13:05 +00:00
|
|
|
result = conn
|
|
|
|
|
|
|
|
proc connect*(s: Switch, peer: PeerInfo) {.async.} =
|
2020-02-25 23:21:12 +00:00
|
|
|
var conn = await s.internalConnect(peer)
|
2020-02-25 22:13:05 +00:00
|
|
|
if isNil(conn):
|
|
|
|
raise newException(CatchableError, "Unable to connect to peer")
|
|
|
|
|
|
|
|
proc dial*(s: Switch,
|
|
|
|
peer: PeerInfo,
|
|
|
|
proto: string):
|
|
|
|
Future[Connection] {.async.} =
|
|
|
|
var conn = await s.internalConnect(peer)
|
2019-12-23 18:44:51 +00:00
|
|
|
if isNil(conn):
|
|
|
|
raise newException(CatchableError, "Unable to establish outgoing link")
|
2019-12-10 20:50:35 +00:00
|
|
|
|
2020-02-25 22:13:05 +00:00
|
|
|
if conn.closed:
|
|
|
|
raise newException(CatchableError, "Connection dead on arrival")
|
2019-12-08 21:06:58 +00:00
|
|
|
|
2020-02-25 23:20:57 +00:00
|
|
|
result = conn
|
2020-02-25 22:13:05 +00:00
|
|
|
let stream = await s.getMuxedStream(peer)
|
|
|
|
if not isNil(stream):
|
|
|
|
trace "Connection is muxed, return muxed stream"
|
|
|
|
result = stream
|
|
|
|
trace "Attempting to select remote", proto = proto
|
2019-12-08 21:06:58 +00:00
|
|
|
|
2020-02-25 22:13:05 +00:00
|
|
|
if not await s.ms.select(result, proto):
|
|
|
|
warn "Unable to select sub-protocol", proto = proto
|
|
|
|
raise newException(CatchableError, &"unable to select protocol: {proto}")
|
2020-02-21 01:14:39 +00:00
|
|
|
|
2019-12-08 21:06:58 +00:00
|
|
|
proc mount*[T: LPProtocol](s: Switch, proto: T) {.gcsafe.} =
|
2019-08-31 17:58:49 +00:00
|
|
|
if isNil(proto.handler):
|
2019-12-04 04:44:54 +00:00
|
|
|
raise newException(CatchableError,
|
2019-08-31 17:58:49 +00:00
|
|
|
"Protocol has to define a handle method or proc")
|
2019-08-27 21:46:12 +00:00
|
|
|
|
2019-09-06 07:13:47 +00:00
|
|
|
if proto.codec.len == 0:
|
2019-12-04 04:44:54 +00:00
|
|
|
raise newException(CatchableError,
|
2019-08-31 18:52:56 +00:00
|
|
|
"Protocol has to define a codec string")
|
|
|
|
|
2019-08-31 17:58:49 +00:00
|
|
|
s.ms.addHandler(proto.codec, proto)
|
2019-08-28 02:30:53 +00:00
|
|
|
|
2019-12-08 21:06:58 +00:00
|
|
|
proc start*(s: Switch): Future[seq[Future[void]]] {.async, gcsafe.} =
|
2019-12-04 04:44:54 +00:00
|
|
|
trace "starting switch"
|
|
|
|
|
2019-08-31 18:52:56 +00:00
|
|
|
proc handle(conn: Connection): Future[void] {.async, closure, gcsafe.} =
|
2019-09-04 22:00:39 +00:00
|
|
|
try:
|
2020-03-04 19:45:14 +00:00
|
|
|
await s.upgradeIncoming(conn) # perform upgrade on incoming connection
|
2019-12-04 04:44:54 +00:00
|
|
|
except CatchableError as exc:
|
2020-03-27 14:25:52 +00:00
|
|
|
trace "Exception occurred in Switch.start", exc = exc.msg
|
2019-09-27 13:24:59 +00:00
|
|
|
finally:
|
2020-04-05 02:42:08 +00:00
|
|
|
await conn.close()
|
2019-09-04 22:00:39 +00:00
|
|
|
await s.cleanupConn(conn)
|
2020-02-25 22:13:05 +00:00
|
|
|
|
2019-09-12 00:15:04 +00:00
|
|
|
var startFuts: seq[Future[void]]
|
2019-08-28 02:30:53 +00:00
|
|
|
for t in s.transports: # for each transport
|
2019-09-28 19:54:32 +00:00
|
|
|
for i, a in s.peerInfo.addrs:
|
2019-08-28 02:30:53 +00:00
|
|
|
if t.handles(a): # check if it handles the multiaddr
|
2019-09-12 00:15:04 +00:00
|
|
|
var server = await t.listen(a, handle)
|
2019-09-28 19:54:32 +00:00
|
|
|
s.peerInfo.addrs[i] = t.ma # update peer's address
|
2019-09-12 00:15:04 +00:00
|
|
|
startFuts.add(server)
|
2019-12-08 21:06:58 +00:00
|
|
|
|
2019-12-06 02:16:18 +00:00
|
|
|
if s.pubSub.isSome:
|
|
|
|
await s.pubSub.get().start()
|
2019-12-04 04:44:54 +00:00
|
|
|
|
2019-09-12 00:15:04 +00:00
|
|
|
result = startFuts # listen for incoming connections
|
2019-08-27 21:46:12 +00:00
|
|
|
|
2019-12-08 21:06:58 +00:00
|
|
|
proc stop*(s: Switch) {.async.} =
|
2019-12-04 04:44:54 +00:00
|
|
|
trace "stopping switch"
|
|
|
|
|
2020-04-11 04:08:25 +00:00
|
|
|
# we want to report erros but we do not want to fail
|
|
|
|
# or crash here, cos we need to clean possibly MANY items
|
|
|
|
# and any following conn/transport won't be cleaned up
|
|
|
|
var futs = newSeq[Future[void]]()
|
|
|
|
|
2019-12-06 02:16:18 +00:00
|
|
|
if s.pubSub.isSome:
|
2020-04-11 04:08:25 +00:00
|
|
|
futs &= s.pubSub.get().stop()
|
|
|
|
|
|
|
|
futs &= toSeq(s.connections.values).mapIt(s.cleanupConn(it))
|
|
|
|
futs &= s.transports.mapIt(it.close())
|
2019-12-06 02:16:18 +00:00
|
|
|
|
2020-04-11 04:08:25 +00:00
|
|
|
futs = await allFinished(futs)
|
|
|
|
checkFutures(futs)
|
2019-09-06 07:13:47 +00:00
|
|
|
|
2020-04-21 01:24:42 +00:00
|
|
|
trace "switch stopped"
|
|
|
|
|
2020-02-21 01:14:39 +00:00
|
|
|
proc subscribeToPeer(s: Switch, peerInfo: PeerInfo) {.async, gcsafe.} =
|
2019-09-12 02:10:38 +00:00
|
|
|
## Subscribe to pub sub peer
|
2020-02-21 01:14:39 +00:00
|
|
|
if s.pubSub.isSome and peerInfo.id notin s.dialedPubSubPeers:
|
|
|
|
try:
|
|
|
|
s.dialedPubSubPeers.incl(peerInfo.id)
|
|
|
|
let conn = await s.dial(peerInfo, s.pubSub.get().codec)
|
|
|
|
await s.pubSub.get().subscribeToPeer(conn)
|
|
|
|
except CatchableError as exc:
|
2020-02-25 22:26:46 +00:00
|
|
|
warn "unable to initiate pubsub", exc = exc.msg
|
2020-03-29 14:28:48 +00:00
|
|
|
finally:
|
2020-02-21 01:14:39 +00:00
|
|
|
s.dialedPubSubPeers.excl(peerInfo.id)
|
2019-09-11 19:03:30 +00:00
|
|
|
|
2020-03-04 19:45:14 +00:00
|
|
|
proc subscribe*(s: Switch, topic: string,
|
|
|
|
handler: TopicHandler): Future[void] =
|
2019-09-12 02:10:38 +00:00
|
|
|
## subscribe to a pubsub topic
|
2019-09-11 19:03:30 +00:00
|
|
|
if s.pubSub.isNone:
|
2020-03-04 19:45:14 +00:00
|
|
|
var retFuture = newFuture[void]("Switch.subscribe")
|
|
|
|
retFuture.fail(newNoPubSubException())
|
|
|
|
return retFuture
|
2019-12-04 04:44:54 +00:00
|
|
|
|
2019-09-11 19:03:30 +00:00
|
|
|
result = s.pubSub.get().subscribe(topic, handler)
|
|
|
|
|
2020-03-04 19:45:14 +00:00
|
|
|
proc unsubscribe*(s: Switch, topics: seq[TopicPair]): Future[void] =
|
2019-09-12 02:10:38 +00:00
|
|
|
## unsubscribe from topics
|
2019-09-11 19:03:30 +00:00
|
|
|
if s.pubSub.isNone:
|
2020-03-04 19:45:14 +00:00
|
|
|
var retFuture = newFuture[void]("Switch.unsubscribe")
|
|
|
|
retFuture.fail(newNoPubSubException())
|
|
|
|
return retFuture
|
2019-12-04 04:44:54 +00:00
|
|
|
|
2019-09-11 19:03:30 +00:00
|
|
|
result = s.pubSub.get().unsubscribe(topics)
|
|
|
|
|
2020-03-04 19:45:14 +00:00
|
|
|
proc publish*(s: Switch, topic: string, data: seq[byte]): Future[void] =
|
2019-09-12 02:10:38 +00:00
|
|
|
# pubslish to pubsub topic
|
2019-09-11 19:03:30 +00:00
|
|
|
if s.pubSub.isNone:
|
2020-03-04 19:45:14 +00:00
|
|
|
var retFuture = newFuture[void]("Switch.publish")
|
|
|
|
retFuture.fail(newNoPubSubException())
|
|
|
|
return retFuture
|
2019-09-11 19:03:30 +00:00
|
|
|
|
|
|
|
result = s.pubSub.get().publish(topic, data)
|
|
|
|
|
2019-12-17 05:24:03 +00:00
|
|
|
proc addValidator*(s: Switch,
|
|
|
|
topics: varargs[string],
|
|
|
|
hook: ValidatorHandler) =
|
|
|
|
# add validator
|
|
|
|
if s.pubSub.isNone:
|
|
|
|
raise newNoPubSubException()
|
|
|
|
|
|
|
|
s.pubSub.get().addValidator(topics, hook)
|
|
|
|
|
|
|
|
proc removeValidator*(s: Switch,
|
|
|
|
topics: varargs[string],
|
|
|
|
hook: ValidatorHandler) =
|
|
|
|
# pubslish to pubsub topic
|
|
|
|
if s.pubSub.isNone:
|
|
|
|
raise newNoPubSubException()
|
|
|
|
|
|
|
|
s.pubSub.get().removeValidator(topics, hook)
|
|
|
|
|
2019-09-06 07:13:47 +00:00
|
|
|
proc newSwitch*(peerInfo: PeerInfo,
|
|
|
|
transports: seq[Transport],
|
|
|
|
identity: Identify,
|
2019-09-09 17:33:32 +00:00
|
|
|
muxers: Table[string, MuxerProvider],
|
2019-09-13 20:04:46 +00:00
|
|
|
secureManagers: Table[string, Secure] = initTable[string, Secure](),
|
2019-09-11 19:03:30 +00:00
|
|
|
pubSub: Option[PubSub] = none(PubSub)): Switch =
|
2019-09-06 07:13:47 +00:00
|
|
|
new result
|
|
|
|
result.peerInfo = peerInfo
|
|
|
|
result.ms = newMultistream()
|
|
|
|
result.transports = transports
|
2019-09-13 18:41:48 +00:00
|
|
|
result.connections = initTable[string, Connection]()
|
|
|
|
result.muxed = initTable[string, Muxer]()
|
2019-09-06 07:13:47 +00:00
|
|
|
result.identity = identity
|
|
|
|
result.muxers = muxers
|
2019-09-13 18:41:48 +00:00
|
|
|
result.secureManagers = initTable[string, Secure]()
|
2020-02-21 01:14:39 +00:00
|
|
|
result.dialedPubSubPeers = initHashSet[string]()
|
2019-09-06 07:13:47 +00:00
|
|
|
|
|
|
|
let s = result # can't capture result
|
2019-12-08 21:06:58 +00:00
|
|
|
result.streamHandler = proc(stream: Connection) {.async, gcsafe.} =
|
2020-02-04 14:17:24 +00:00
|
|
|
trace "handling connection for", peerInfo = $stream.peerInfo
|
2019-09-06 07:13:47 +00:00
|
|
|
await s.ms.handle(stream) # handle incoming connection
|
|
|
|
|
|
|
|
result.mount(identity)
|
|
|
|
for key, val in muxers:
|
|
|
|
val.streamHandler = result.streamHandler
|
2019-09-12 02:10:38 +00:00
|
|
|
val.muxerHandler = proc(muxer: Muxer) {.async, gcsafe.} =
|
2019-09-23 21:51:28 +00:00
|
|
|
trace "got new muxer"
|
2019-09-12 02:10:38 +00:00
|
|
|
let stream = await muxer.newStream()
|
2019-12-10 20:50:35 +00:00
|
|
|
muxer.connection.peerInfo = await s.identify(stream)
|
2019-09-28 19:54:32 +00:00
|
|
|
await stream.close()
|
2019-09-12 02:10:38 +00:00
|
|
|
|
2019-09-13 18:41:48 +00:00
|
|
|
for k in secureManagers.keys:
|
2019-09-23 21:51:28 +00:00
|
|
|
trace "adding secure manager ", codec = secureManagers[k].codec
|
2019-09-13 18:41:48 +00:00
|
|
|
result.secureManagers[k] = secureManagers[k]
|
2019-09-09 17:33:32 +00:00
|
|
|
|
|
|
|
if result.secureManagers.len == 0:
|
|
|
|
# use plain text if no secure managers are provided
|
2020-02-12 14:43:42 +00:00
|
|
|
warn "no secure managers, falling back to plain text", codec = PlainTextCodec
|
2019-09-13 18:41:48 +00:00
|
|
|
result.secureManagers[PlainTextCodec] = Secure(newPlainText())
|
2019-09-11 19:03:30 +00:00
|
|
|
|
|
|
|
if pubSub.isSome:
|
|
|
|
result.pubSub = pubSub
|
|
|
|
result.mount(pubSub.get())
|