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const EventEmitter = require('events')
const MetaMaskProvider = 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 RPC_ADDRESS_LIST = require('../config.js').network
const DEFAULT_RPC = RPC_ADDRESS_LIST['rinkeby']
module.exports = class NetworkController extends EventEmitter {
constructor (config) {
super()
this.networkStore = new ObservableStore('loading')
config.provider.rpcTarget = this.getRpcAddressForType(config.provider.type, config.provider)
this.providerStore = new ObservableStore(config.provider)
this.store = new ComposedStore({ provider: this.providerStore, network: this.networkStore })
this._providerListeners = {}
this.on('networkDidChange', this.lookupNetwork)
this.providerStore.subscribe((state) => this.switchNetwork({rpcUrl: state.rpcTarget}))
}
get provider () {
return this._proxy
}
set provider (provider) {
this._provider = provider
}
initializeProvider (opts) {
this.providerInit = 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 (providerInit) {
this.setNetworkState('loading')
const newInit = extend(this.providerInit, providerInit)
this.providerInit = newInit
this._provider.removeAllListeners()
this._provider.stop()
this.provider = MetaMaskProvider(newInit)
// apply the listners created by other controllers
Object.keys(this._providerListeners).forEach((key) => {
this._providerListeners[key].forEach((handler) => this._provider.addListener(key, handler))
})
this.emit('networkDidChange')
}
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 () {
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,
})
}
getCurrentRpcAddress () {
const provider = this.getProviderConfig()
if (!provider) return null
return this.getRpcAddressForType(provider.type)
}
setProviderType (type) {
if (type === this.getProviderConfig().type) return
const rpcTarget = this.getRpcAddressForType(type)
this.providerStore.updateState({type, 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
}
_logBlock (block) {
log.info(`BLOCK CHANGED: #${block.number.toString('hex')} 0x${block.hash.toString('hex')}`)
this.verifyNetwork()
}
_on (event, handler) {
if (!this._providerListeners[event]) this._providerListeners[event] = []
this._providerListeners[event].push(handler)
this._provider.on(event, handler)
}
}
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