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feat(dial): exposing connection handle flow
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| 'use strict' | ||
|
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| const multistream = require('multistream-select') | ||
| const protocolMuxer = require('./protocol-muxer') | ||
|
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| const debug = require('debug') | ||
| const log = debug('libp2p:swarm:handle') | ||
|
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| module.exports = function process (swarm) { | ||
| return (pi, protocol, proxyConn) => { | ||
| const b58Id = pi.id.toB58String() | ||
|
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| function cryptoDial (conn, cb) { | ||
| const ms = new multistream.Dialer() | ||
| ms.handle(conn, (err) => { | ||
| if (err) { | ||
| return cb(err) | ||
| } | ||
|
|
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| const id = swarm._peerInfo.id | ||
| log('selecting crypto: %s', swarm.crypto.tag) | ||
| ms.select(swarm.crypto.tag, (err, conn) => { | ||
| if (err) { | ||
| return cb(err) | ||
| } | ||
|
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| const wrapped = swarm.crypto.encrypt(id, id.privKey, conn) | ||
| cb(null, wrapped) | ||
| }) | ||
| }) | ||
| } | ||
|
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| function gotWarmedUpConn (conn, cb) { | ||
| conn.setPeerInfo(pi) | ||
| attemptMuxerUpgrade(conn, (err, muxer) => { | ||
| if (!protocol) { | ||
| if (err) { | ||
| swarm.conns[b58Id] = conn | ||
| } | ||
| return cb() | ||
| } | ||
|
|
||
| if (err) { | ||
| // couldn't upgrade to Muxer, it is ok | ||
| protocolHandshake(conn, protocol, cb) | ||
| } else { | ||
| gotMuxer(muxer, cb) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| function attemptMuxerUpgrade (conn, cb) { | ||
| const muxers = Object.keys(swarm.muxers) | ||
| if (muxers.length === 0) { | ||
| return cb(new Error('no muxers available')) | ||
| } | ||
|
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| // 1. try to handshake in one of the muxers available | ||
| // 2. if succeeds | ||
| // - add the muxedConn to the list of muxedConns | ||
| // - add incomming new streams to connHandler | ||
|
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| const ms = new multistream.Dialer() | ||
| ms.handle(conn, (err) => { | ||
| if (err) { | ||
| return cb(new Error('multistream not supported')) | ||
| } | ||
|
|
||
| nextMuxer(muxers.shift()) | ||
| }) | ||
|
|
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| function nextMuxer (key) { | ||
| log('selecting %s', key) | ||
| ms.select(key, (err, conn) => { | ||
| if (err) { | ||
| if (muxers.length === 0) { | ||
| cb(new Error('could not upgrade to stream muxing')) | ||
| } else { | ||
| nextMuxer(muxers.shift()) | ||
| } | ||
| return | ||
| } | ||
|
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| const muxedConn = swarm.muxers[key].dialer(conn) | ||
| swarm.muxedConns[b58Id] = {} | ||
| swarm.muxedConns[b58Id].muxer = muxedConn | ||
| // should not be needed anymore - swarm.muxedConns[b58Id].conn = conn | ||
|
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| swarm.emit('peer-mux-established', pi) | ||
|
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| muxedConn.once('close', () => { | ||
| const b58Str = pi.id.toB58String() | ||
| delete swarm.muxedConns[b58Str] | ||
| pi.disconnect() | ||
| swarm._peerBook.get(b58Str).disconnect() | ||
| swarm.emit('peer-mux-closed', pi) | ||
| }) | ||
|
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| // For incoming streams, in case identify is on | ||
| muxedConn.on('stream', (conn) => { | ||
| protocolMuxer(swarm.protocols, conn) | ||
| }) | ||
|
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| cb(null, muxedConn) | ||
| }) | ||
| } | ||
| } | ||
|
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| function openConnInMuxedConn (muxer, cb) { | ||
| cb(muxer.newStream()) | ||
| } | ||
|
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| function protocolHandshake (conn, protocol, cb) { | ||
| const ms = new multistream.Dialer() | ||
| ms.handle(conn, (err) => { | ||
| if (err) { | ||
| return cb(err) | ||
| } | ||
| ms.select(protocol, (err, conn) => { | ||
| if (err) { | ||
| return cb(err) | ||
| } | ||
| proxyConn.setInnerConn(conn) | ||
| cb(null, proxyConn) | ||
| }) | ||
| }) | ||
| } | ||
|
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||
| function handleNew (conn, cb) { | ||
| cryptoDial(conn, (err, conn) => { | ||
| if (err) { | ||
| log(err) | ||
| return cb(err) | ||
| } | ||
| gotWarmedUpConn(conn, cb) | ||
| }) | ||
| } | ||
|
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| function handleWarmedUp (conn, cb) { | ||
| gotWarmedUpConn(conn, cb) | ||
| } | ||
|
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| function gotMuxer (muxer, cb) { | ||
| if (swarm.identify) { | ||
| // TODO: Consider: | ||
| // 1. overload getPeerInfo | ||
| // 2. exec identify (through getPeerInfo) | ||
| // 3. update the peerInfo that is already stored in the conn | ||
| } | ||
|
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| openConnInMuxedConn(muxer, (conn) => { | ||
| protocolHandshake(conn, protocol, cb) | ||
| }) | ||
| } | ||
|
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| return { | ||
| handleNew: handleNew, | ||
| handleWarmedUp: handleWarmedUp, | ||
| gotMuxer: gotMuxer | ||
| } | ||
| } | ||
| } |
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