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const assert = require('assert')
const EventEmitter = require('events')
const createMetamaskProvider = require('web3-provider-engine/zero.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) {
console.log('_configureInfuraProvider', opts)
const blockTrackerProvider = createInfuraProvider({
network: opts.type,
})
const providerParams = extend(this._baseProviderParams, {
rpcUrl: opts.rpcUrl,
engineParams: {
pollingInterval: 8000,
blockTrackerProvider,
},
})
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()
}
}
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