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const EventEmitter = require('events')
const MetaMaskProvider = require('web3-provider-engine/zero.js')
const ObservableStore = require('obs-store')
const extend = require('xtend')
const EthQuery = require('eth-query')
const RPC_ADDRESS_LIST = require('../config.js').network
module.exports = class NetworkController extends EventEmitter {
constructor (providerOpts) {
super()
this.networkStore = new ObservableStore({ network: 'loading' })
providerOpts.provider.rpcTarget = this.getRpcAddressForType(providerOpts.provider.type, providerOpts.provider)
this.providerStore = new ObservableStore(providerOpts)
this.store = new ObservableStore(extend(this.networkStore.getState(), this.providerStore.getState()))
this._providerListners = {}
this.networkStore.subscribe((state) => this.store.updateState(state))
this.providerStore.subscribe((state) => this.store.updateState(state))
this.on('networkSwitch', this.lookupNetwork)
}
get provider () {
return this._proxy
}
set provider (provider) {
this._provider = provider
}
getState () {
return extend({},
this.networkStore.getState(),
this.providerStore.getState()
)
}
initializeProvider (opts) {
this.providerConfig = opts
this._provider = MetaMaskProvider(opts)
this._proxy = new Proxy(this._provider, {
get: (obj, name) => {
if (name === 'on') return this._on.bind(this)
return this._provider[name]
},
set: (obj, name, value) => {
this._provider[name] = value
},
})
this.provider.on('block', this._logBlock.bind(this))
this.provider.on('error', this.verifyNetwork.bind(this))
this.ethQuery = new EthQuery(this.provider)
this.lookupNetwork()
return this.provider
}
switchNetwork (providerConfig) {
const newConfig = extend(this.providerConfig, providerConfig)
this.providerConfig = newConfig
this.provider = MetaMaskProvider(newConfig)
// apply the listners created by other controllers
Object.keys(this._providerListners).forEach((key) => {
this._providerListners[key].forEach((handler) => this._provider.addListener(key, handler))
})
this.emit('networkSwitch', this.provider)
}
verifyNetwork () {
// Check network when restoring connectivity:
if (this.isNetworkLoading()) this.lookupNetwork()
}
getNetworkState () {
return this.networkStore.getState().network
}
setNetworkState (network) {
return this.networkStore.updateState({ network })
}
isNetworkLoading () {
return this.getNetworkState() === 'loading'
}
lookupNetwork (err) {
if (err) this.setNetworkState('loading')
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({
provider: {
type: 'rpc',
rpcTarget: rpcUrl,
},
})
}
getCurrentRpcAddress () {
var provider = this.getProvider()
if (!provider) return null
return this.getRpcAddressForType(provider.type)
}
setProviderType (type) {
if (type === this.getProvider().type) return
const rpcTarget = this.getRpcAddressForType(type)
this.networkStore.updateState({network: 'loading'})
this.switchNetwork({
rpcUrl: rpcTarget,
})
this.providerStore.updateState({provider: {type, rpcTarget}})
}
getProvider () {
return this.providerStore.getState().provider
}
getRpcAddressForType (type, provider = this.getProvider()) {
console.log(`#getRpcAddressForType: ${type}`)
if (type in RPC_ADDRESS_LIST) return RPC_ADDRESS_LIST[type]
return provider && provider.rpcTarget ? provider.rpcTarget : RPC_ADDRESS_LIST['rinkeby']
}
_logBlock (block) {
log.info(`BLOCK CHANGED: #${block.number.toString('hex')} 0x${block.hash.toString('hex')}`)
this.verifyNetwork()
}
_on (event, handler) {
if (!this._providerListners[event]) this._providerListners[event] = []
this._providerListners[event].push(handler)
this._provider.on(event, handler)
}
}
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