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
|
const assert = require('assert')
const EventEmitter = require('events')
const createMetamaskProvider = require('web3-provider-engine/zero.js')
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']
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 rpcUrl = this.getCurrentRpcAddress()
this._configureStandardProvider({ rpcUrl })
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 "${type}"`)
this.providerStore.updateState({ type, rpcTarget })
this._switchNetwork({ rpcUrl: rpcTarget })
}
getProviderConfig () {
return this.providerStore.getState()
}
getRpcAddressForType (type, provider = this.getProviderConfig()) {
if (RPC_ADDRESS_LIST[type]) return RPC_ADDRESS_LIST[type]
return provider && provider.rpcTarget ? provider.rpcTarget : DEFAULT_RPC
}
//
// Private
//
_switchNetwork (providerParams) {
this.setNetworkState('loading')
this._configureStandardProvider(providerParams)
this.emit('networkDidChange')
}
_configureStandardProvider (_providerParams) {
const providerParams = extend(this._baseProviderParams, _providerParams)
const provider = createMetamaskProvider(providerParams)
this._setProvider(provider)
}
_setProvider (provider) {
// collect old block tracker events
const oldProvider = this._provider
let blockTrackerHandlers
if (oldProvider) {
// capture old block handlers
blockTrackerHandlers = oldProvider._blockTracker.proxyEventHandlers
// tear down
oldProvider.removeAllListeners()
oldProvider.stop()
}
// override block tracler
provider._blockTracker = createEventEmitterProxy(provider._blockTracker, blockTrackerHandlers)
// set as new provider
this._provider = provider
this._proxy.setTarget(provider)
}
_logBlock (block) {
log.info(`BLOCK CHANGED: #${block.number.toString('hex')} 0x${block.hash.toString('hex')}`)
this.verifyNetwork()
}
}
|
