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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
const assert = require('assert')
const EventEmitter = require('events')
const createMetamaskProvider = require('web3-provider-engine/zero.js')
const SubproviderFromProvider = require('web3-provider-engine/subproviders/web3.js')
const createInfuraProvider = require('eth-json-rpc-infura/src/createProvider')
const ObservableStore = require('obs-store')
const ComposedStore = require('obs-store/lib/composed')
const extend = require('xtend')
const EthQuery = require('eth-query')
const createEventEmitterProxy = require('../lib/events-proxy.js')
const RPC_ADDRESS_LIST = require('../config.js').network
const DEFAULT_RPC = RPC_ADDRESS_LIST['rinkeby']
const INFURA_PROVIDER_TYPES = ['ropsten', 'rinkeby', 'kovan', 'mainnet']
module.exports = class NetworkController extends EventEmitter {
constructor (config) {
super()
config.provider.rpcTarget = this.getRpcAddressForType(config.provider.type, config.provider)
this.networkStore = new ObservableStore('loading')
this.providerStore = new ObservableStore(config.provider)
this.store = new ComposedStore({ provider: this.providerStore, network: this.networkStore })
this._proxy = createEventEmitterProxy()
this.on('networkDidChange', this.lookupNetwork)
}
initializeProvider (_providerParams) {
this._baseProviderParams = _providerParams
const { type, rpcTarget } = this.providerStore.getState()
// map rpcTarget to rpcUrl
const opts = {
type,
rpcUrl: rpcTarget,
}
this._configureProvider(opts)
this._proxy.on('block', this._logBlock.bind(this))
this._proxy.on('error', this.verifyNetwork.bind(this))
this.ethQuery = new EthQuery(this._proxy)
this.lookupNetwork()
return this._proxy
}
verifyNetwork () {
// Check network when restoring connectivity:
if (this.isNetworkLoading()) this.lookupNetwork()
}
getNetworkState () {
return this.networkStore.getState()
}
setNetworkState (network) {
return this.networkStore.putState(network)
}
isNetworkLoading () {
return this.getNetworkState() === 'loading'
}
lookupNetwork () {
// Prevent firing when provider is not defined.
if (!this.ethQuery || !this.ethQuery.sendAsync) {
return log.warn('NetworkController - lookupNetwork aborted due to missing ethQuery')
}
this.ethQuery.sendAsync({ method: 'net_version' }, (err, network) => {
if (err) return this.setNetworkState('loading')
log.info('web3.getNetwork returned ' + network)
this.setNetworkState(network)
})
}
setRpcTarget (rpcUrl) {
this.providerStore.updateState({
type: 'rpc',
rpcTarget: rpcUrl,
})
this._switchNetwork({ rpcUrl })
}
getCurrentRpcAddress () {
const provider = this.getProviderConfig()
if (!provider) return null
return this.getRpcAddressForType(provider.type)
}
async setProviderType (type) {
assert(type !== 'rpc', `NetworkController.setProviderType - cannot connect by type "rpc"`)
// skip if type already matches
if (type === this.getProviderConfig().type) return
const rpcTarget = this.getRpcAddressForType(type)
assert(rpcTarget, `NetworkController - unknown rpc address for type "${type}"`)
this.providerStore.updateState({ type, rpcTarget })
this._switchNetwork({ type })
}
getProviderConfig () {
return this.providerStore.getState()
}
getRpcAddressForType (type, provider = this.getProviderConfig()) {
if (RPC_ADDRESS_LIST[type]) return RPC_ADDRESS_LIST[type]
return provider && provider.rpcTarget ? provider.rpcTarget : DEFAULT_RPC
}
//
// Private
//
_switchNetwork (opts) {
this.setNetworkState('loading')
this._configureProvider(opts)
this.emit('networkDidChange')
}
_configureProvider (opts) {
// type-based rpc endpoints
const { type } = opts
if (type) {
// type-based infura rpc endpoints
const isInfura = INFURA_PROVIDER_TYPES.includes(type)
opts.rpcUrl = this.getRpcAddressForType(type)
if (isInfura) {
this._configureInfuraProvider(opts)
// other type-based rpc endpoints
} else {
this._configureStandardProvider(opts)
}
// url-based rpc endpoints
} else {
this._configureStandardProvider(opts)
}
}
_configureInfuraProvider (opts) {
log.info('_configureInfuraProvider', opts)
const infuraProvider = createInfuraProvider({
network: opts.type,
})
const infuraSubprovider = new SubproviderFromProvider(infuraProvider)
const providerParams = extend(this._baseProviderParams, {
rpcUrl: opts.rpcUrl,
engineParams: {
pollingInterval: 8000,
blockTrackerProvider: infuraProvider,
},
dataSubprovider: infuraSubprovider,
})
const provider = createMetamaskProvider(providerParams)
this._setProvider(provider)
}
_configureStandardProvider ({ rpcUrl }) {
const providerParams = extend(this._baseProviderParams, {
rpcUrl,
engineParams: {
pollingInterval: 8000,
},
})
const provider = createMetamaskProvider(providerParams)
this._setProvider(provider)
}
_setProvider (provider) {
// collect old block tracker events
const oldProvider = this._provider
let blockTrackerHandlers
if (oldProvider) {
// capture old block handlers
blockTrackerHandlers = oldProvider._blockTracker.proxyEventHandlers
// tear down
oldProvider.removeAllListeners()
oldProvider.stop()
}
// override block tracler
provider._blockTracker = createEventEmitterProxy(provider._blockTracker, blockTrackerHandlers)
// set as new provider
this._provider = provider
this._proxy.setTarget(provider)
}
_logBlock (block) {
log.info(`BLOCK CHANGED: #${block.number.toString('hex')} 0x${block.hash.toString('hex')}`)
this.verifyNetwork()
}
}
|
