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const assert = require('assert')
const EventEmitter = require('events')
const ObservableStore = require('obs-store')
const ComposedStore = require('obs-store/lib/composed')
const extend = require('xtend')
const EthQuery = require('eth-query')
const createEthRpcClient = require('eth-rpc-client')
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.providerProxy = createEventEmitterProxy()
this.blockTrackerProxy = createEventEmitterProxy()
this.on('networkDidChange', this.lookupNetwork)
}
initializeProvider (_providerParams) {
this._baseProviderParams = _providerParams
const rpcUrl = this.getCurrentRpcAddress()
this._configureStandardClient({ rpcUrl })
this.providerProxy.on('block', this._logBlock.bind(this))
this.providerProxy.on('error', this.verifyNetwork.bind(this))
this.ethQuery = new EthQuery(this.providerProxy)
this.lookupNetwork()
}
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,
})
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
// lookup rpcTarget for typecreateMetamaskProvider
const rpcTarget = this.getRpcAddressForType(type)
assert(rpcTarget, `NetworkController - unknown rpc address for type "${type}"`)
// update connectioncreateMetamaskProvider
this.providerStore.updateState({ type, rpcTarget })
this._switchNetwork({ rpcUrl: rpcTarget })
}
getProviderConfig () {
return this.providerStore.getState()
}
getRpcAddressForType (type, provider = this.getProviderConfig()) {
if (RPC_ADDRESS_LIST[type]) return RPC_ADDRESS_LIST[type]
return provider && provider.rpcTarget ? provider.rpcTarget : DEFAULT_RPC
}
//
// Private
//
_switchNetwork (providerParams) {
this.setNetworkState('loading')
this._configureStandardClient(providerParams)
this.emit('networkDidChange')
}
_configureStandardClient(_providerParams) {
const providerParams = extend(this._baseProviderParams, _providerParams)
const client = createEthRpcClient(providerParams)
this._setClient(client)
}
_setClient (newClient) {
// teardown old client
const oldClient = this._currentClient
if (oldClient) {
oldClient.blockTracker.stop()
// asyncEventEmitter lacks a "removeAllListeners" method
// oldClient.blockTracker.removeAllListeners
oldClient.blockTracker._events = {}
}
// set as new provider
this._currentClient = newClient
this.providerProxy.setTarget(newClient.provider)
this.blockTrackerProxy.setTarget(newClient.blockTracker)
}
_logBlock (block) {
log.info(`BLOCK CHANGED: #${block.number.toString('hex')} 0x${block.hash.toString('hex')}`)
this.verifyNetwork()
}
}
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