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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 MetamaskConfig = require('../config.js')
const TESTNET_RPC = MetamaskConfig.network.testnet
const MAINNET_RPC = MetamaskConfig.network.mainnet
const MORDEN_RPC = MetamaskConfig.network.morden
const KOVAN_RPC = MetamaskConfig.network.kovan
const RINKEBY_RPC = MetamaskConfig.network.rinkeby
module.exports = class NetworkController extends EventEmitter {
constructor (providerOpts) {
super()
this.networkStore = new ObservableStore({ network: 'loading' })
providerOpts.provider.rpcTarget = this.getRpcAddressForType(providerOpts.provider.type)
this.providerStore = new ObservableStore(providerOpts)
this._claimed = 0
}
getState () {
return extend({},
this.networkStore.getState(),
this.providerStore.getState()
)
}
initializeProvider (opts) {
this.providerConfig = opts
this.provider = MetaMaskProvider(opts)
this.ethQuery = new EthQuery(this.provider)
this.lookupNetwork()
return Promise.resolve(this.provider)
}
switchNetwork (providerConfig) {
delete this.provider
delete this.ethQuery
const newConfig = extend(this.providerConfig, providerConfig)
this.providerConfig = newConfig
this.provider = MetaMaskProvider(newConfig)
this.ethQuery = new EthQuery(this.provider)
this.emit('networkSwitch', {
provider: this.provider,
ethQuery: this.ethQuery,
}, this.claim.bind(this))
}
subscribe (cb) {
this.networkStore.subscribe(cb)
this.providerStore.subscribe(cb)
}
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.once('claimed', () => {
this.providerStore.updateState({provider: {type, rpcTarget}})
console.log('CLAIMED')
this.lookupNetwork()
})
}
useEtherscanProvider () {
this.setProviderType('etherscan')
}
getProvider () {
return this.providerStore.getState().provider
}
getRpcAddressForType (type) {
const provider = this.getProvider()
switch (type) {
case 'mainnet':
return MAINNET_RPC
case 'testnet':
return TESTNET_RPC
case 'morden':
return MORDEN_RPC
case 'kovan':
return KOVAN_RPC
case 'rinkeby':
return RINKEBY_RPC
default:
return provider && provider.rpcTarget ? provider.rpcTarget : TESTNET_RPC
}
}
claim () {
this._claimed += 1
if (this._claimed === this.listenerCount('networkSwitch')) {
this.emit('claimed')
this._claimed = 0
}
}
}
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