This repository has been archived by the owner on Aug 29, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 40
/
listener.js
156 lines (133 loc) · 4.38 KB
/
listener.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
'use strict'
const net = require('net')
const EventEmitter = require('events')
const debug = require('debug')
const log = Object.assign(
debug('libp2p:tcp:listener'),
{ error: debug('libp2p:tcp:listener:error') })
const toConnection = require('./socket-to-conn')
const { CODE_P2P } = require('./constants')
const {
getMultiaddrs,
multiaddrToNetConfig
} = require('./utils')
/**
* @typedef {import('multiaddr').Multiaddr} Multiaddr
* @typedef {import('libp2p-interfaces/src/connection').Connection} Connection
* @typedef {import('libp2p-interfaces/src/transport/types').Upgrader} Upgrader
* @typedef {import('libp2p-interfaces/src/transport/types').MultiaddrConnection} MultiaddrConnection
* @typedef {import('libp2p-interfaces/src/transport/types').Listener} Listener
* @typedef {import('net').Server & {__connections: MultiaddrConnection[]}} Server
*/
/**
* Attempts to close the given maConn. If a failure occurs, it will be logged.
*
* @private
* @param {MultiaddrConnection} maConn
*/
async function attemptClose (maConn) {
try {
maConn && await maConn.close()
} catch (err) {
log.error('an error occurred closing the connection', err)
}
}
/**
* Create listener
*
* @param {object} context
* @param {function(Connection):void} context.handler
* @param {Upgrader} context.upgrader
* @param {*} options
* @returns {Listener}
*/
module.exports = ({ handler, upgrader }, options) => {
/** @type {Server} */
// eslint-disable-next-line prefer-const
let server
/** @type {string | null} */
let peerId
/** @type {Multiaddr} */
let listeningAddr
const listener = Object.assign(new EventEmitter(), {
getAddrs: () => {
/** @type {Multiaddr[]} */
let addrs = []
/** @type {import('net').AddressInfo} */
// @ts-ignore
const address = server.address()
if (!address) {
throw new Error('Listener is not ready yet')
}
// Because TCP will only return the IPv6 version
// we need to capture from the passed multiaddr
if (listeningAddr.toString().startsWith('/ip4')) {
addrs = addrs.concat(getMultiaddrs('ip4', address.address, address.port))
} else if (address.family === 'IPv6') {
addrs = addrs.concat(getMultiaddrs('ip6', address.address, address.port))
}
return addrs.map(ma => peerId ? ma.encapsulate(`/p2p/${peerId}`) : ma)
},
listen: async (/** @type {Multiaddr} */ ma) => {
listeningAddr = ma
peerId = ma.getPeerId()
if (peerId) {
listeningAddr = ma.decapsulateCode(CODE_P2P)
}
return new Promise((resolve, reject) => {
const options = multiaddrToNetConfig(listeningAddr)
server.listen(options, (/** @type {any} */ err) => {
if (err) return reject(err)
log('Listening on %s', server.address())
resolve(undefined)
})
})
},
close: async () => {
if (!server.listening) return
return new Promise((resolve, reject) => {
server.__connections.forEach(maConn => attemptClose(maConn))
server.close(err => err ? reject(err) : resolve(undefined))
})
}
})
server = Object.assign(net.createServer(async socket => {
// Avoid uncaught errors caused by unstable connections
socket.on('error', err => log('socket error', err))
/** @type {MultiaddrConnection} */
let maConn
let conn
try {
maConn = toConnection(socket, { listeningAddr })
log('new inbound connection %s', maConn.remoteAddr)
conn = await upgrader.upgradeInbound(maConn)
} catch (err) {
log.error('inbound connection failed', err)
// @ts-ignore
return attemptClose(maConn)
}
log('inbound connection %s upgraded', maConn.remoteAddr)
trackConn(server, maConn)
if (handler) handler(conn)
listener.emit('connection', conn)
}),
// Keep track of open connections to destroy in case of timeout
{ __connections: [] })
server
.on('listening', () => listener.emit('listening'))
.on('error', err => listener.emit('error', err))
.on('close', () => listener.emit('close'))
return listener
}
/**
* @param {Server} server
* @param {MultiaddrConnection} maConn
*/
function trackConn (server, maConn) {
server.__connections.push(maConn)
const untrackConn = () => {
server.__connections = server.__connections.filter(c => c !== maConn)
}
// @ts-ignore
maConn.conn.once('close', untrackConn)
}