Revert "NetworkController refactor for new EthClient interface"

6 files changed, 72 insertions, 90 deletions

diff --git a/app/scripts/controllers/network.js b/app/scripts/controllers/network.js
index 64ed4b7c2..0f9db4d53 100644
--- a/app/scripts/controllers/network.js
+++ b/app/scripts/controllers/network.js
@@ -1,12 +1,11 @@
 const assert = require('assert')
 const EventEmitter = require('events')
+const createMetamaskProvider = 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 createEthRpcClient = require('eth-rpc-client')
 const createEventEmitterProxy = require('../lib/events-proxy.js')
-const createObjectProxy = require('../lib/obj-proxy.js')
 const RPC_ADDRESS_LIST = require('../config.js').network
 const DEFAULT_RPC = RPC_ADDRESS_LIST['rinkeby']
 
@@ -18,8 +17,7 @@ module.exports = class NetworkController extends EventEmitter {
     this.networkStore = new ObservableStore('loading')
     this.providerStore = new ObservableStore(config.provider)
     this.store = new ComposedStore({ provider: this.providerStore, network: this.networkStore })
-    this.providerProxy = createObjectProxy()
-    this.blockTrackerProxy = createEventEmitterProxy()
+    this._proxy = createEventEmitterProxy()
 
     this.on('networkDidChange', this.lookupNetwork)
   }
@@ -27,11 +25,12 @@ module.exports = class NetworkController extends EventEmitter {
   initializeProvider (_providerParams) {
     this._baseProviderParams = _providerParams
     const rpcUrl = this.getCurrentRpcAddress()
-    this._configureStandardClient({ rpcUrl })
-    this.blockTrackerProxy.on('block', this._logBlock.bind(this))
-    this.blockTrackerProxy.on('error', this.verifyNetwork.bind(this))
-    this.ethQuery = new EthQuery(this.providerProxy)
+    this._configureStandardProvider({ rpcUrl })
+    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 () {
@@ -77,10 +76,8 @@ module.exports = class NetworkController extends EventEmitter {
     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 })
   }
@@ -100,29 +97,32 @@ module.exports = class NetworkController extends EventEmitter {
 
   _switchNetwork (providerParams) {
     this.setNetworkState('loading')
-    this._configureStandardClient(providerParams)
+    this._configureStandardProvider(providerParams)
     this.emit('networkDidChange')
   }
 
-  _configureStandardClient(_providerParams) {
+  _configureStandardProvider(_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 = {}
+    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._currentClient = newClient
-    this.providerProxy.setTarget(newClient.provider)
-    this.blockTrackerProxy.setTarget(newClient.blockTracker)
+    this._provider = provider
+    this._proxy.setTarget(provider)
   }
 
   _logBlock (block) {
diff --git a/app/scripts/controllers/transactions.js b/app/scripts/controllers/transactions.js
index d46dee230..ef659a300 100644
--- a/app/scripts/controllers/transactions.js
+++ b/app/scripts/controllers/transactions.js
@@ -46,7 +46,6 @@ module.exports = class TransactionController extends EventEmitter {
     this.txStateManager.on('tx:status-update', this.emit.bind(this, 'tx:status-update'))
     this.nonceTracker = new NonceTracker({
       provider: this.provider,
-      blockTracker: this.blockTracker,
       getPendingTransactions: this.txStateManager.getPendingTransactions.bind(this.txStateManager),
       getConfirmedTransactions: (address) => {
         return this.txStateManager.getFilteredTxList({
diff --git a/app/scripts/lib/events-proxy.js b/app/scripts/lib/events-proxy.js
index 840b06b1a..d1199a278 100644
--- a/app/scripts/lib/events-proxy.js
+++ b/app/scripts/lib/events-proxy.js
@@ -1,5 +1,6 @@
-module.exports = function createEventEmitterProxy(eventEmitter, eventHandlers = {}) {
+module.exports = function createEventEmitterProxy(eventEmitter, listeners) {
   let target = eventEmitter
+  const eventHandlers = listeners || {}
   const proxy = new Proxy({}, {
     get: (obj, name) => {
       // intercept listeners
@@ -13,12 +14,9 @@ module.exports = function createEventEmitterProxy(eventEmitter, eventHandlers =
       return true
     },
   })
-  proxy.setTarget(eventEmitter)
-  return proxy
-
   function setTarget (eventEmitter) {
     target = eventEmitter
-    // migrate eventHandlers
+    // migrate listeners
     Object.keys(eventHandlers).forEach((name) => {
       eventHandlers[name].forEach((handler) => target.on(name, handler))
     })
@@ -28,4 +26,6 @@ module.exports = function createEventEmitterProxy(eventEmitter, eventHandlers =
     eventHandlers[name].push(handler)
     target.on(name, handler)
   }
+  if (listeners) proxy.setTarget(eventEmitter)
+  return proxy
 }
\ No newline at end of file
diff --git a/app/scripts/lib/nonce-tracker.js b/app/scripts/lib/nonce-tracker.js
index 2af40a27f..0029ac953 100644
--- a/app/scripts/lib/nonce-tracker.js
+++ b/app/scripts/lib/nonce-tracker.js
@@ -4,9 +4,8 @@ const Mutex = require('await-semaphore').Mutex
 
 class NonceTracker {
 
-  constructor ({ provider, blockTracker, getPendingTransactions, getConfirmedTransactions }) {
+  constructor ({ provider, getPendingTransactions, getConfirmedTransactions }) {
     this.provider = provider
-    this.blockTracker = blockTracker
     this.ethQuery = new EthQuery(provider)
     this.getPendingTransactions = getPendingTransactions
     this.getConfirmedTransactions = getConfirmedTransactions
@@ -54,7 +53,7 @@ class NonceTracker {
   }
 
   async _getCurrentBlock () {
-    const blockTracker = this.blockTracker
+    const blockTracker = this._getBlockTracker()
     const currentBlock = blockTracker.getCurrentBlock()
     if (currentBlock) return currentBlock
     return await Promise((reject, resolve) => {
@@ -140,6 +139,11 @@ class NonceTracker {
     return { name: 'local', nonce: highest, details: { startPoint, highest } }
   }
 
+  // this is a hotfix for the fact that the blockTracker will
+  // change when the network changes
+  _getBlockTracker () {
+    return this.provider._blockTracker
+  }
 }
 
 module.exports = NonceTracker
diff --git a/app/scripts/lib/obj-proxy.js b/app/scripts/lib/obj-proxy.js
deleted file mode 100644
index 29ca1269f..000000000
--- a/app/scripts/lib/obj-proxy.js
+++ /dev/null
@@ -1,19 +0,0 @@
-module.exports = function createObjectProxy(obj) {
-  let target = obj
-  const proxy = new Proxy({}, {
-    get: (obj, name) => {
-      // intercept setTarget
-      if (name === 'setTarget') return setTarget
-      return target[name]
-    },
-    set: (obj, name, value) => {
-      target[name] = value
-      return true
-    },
-  })
-  return proxy
-
-  function setTarget (obj) {
-    target = obj
-  }
-}
\ No newline at end of file
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index a742f3cba..727f48f1c 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -81,24 +81,9 @@ module.exports = class MetamaskController extends EventEmitter {
     })
     this.blacklistController.scheduleUpdates()
 
-    // rpc provider and block tracker
-    this.networkController.initializeProvider({
-      scaffold: {
-        eth_syncing: false,
-        web3_clientVersion: `MetaMask/v${version}`,
-      },
-      // account mgmt
-      getAccounts: nodeify(this.getAccounts, this),
-      // tx signing
-      processTransaction: nodeify(this.newTransaction, this),
-      // old style msg signing
-      processMessage: this.newUnsignedMessage.bind(this),
-      // personal_sign msg signing
-      processPersonalMessage: this.newUnsignedPersonalMessage.bind(this),
-      processTypedMessage: this.newUnsignedTypedMessage.bind(this),
-    })
-    this.provider = this.networkController.providerProxy
-    this.blockTracker = this.networkController.blockTrackerProxy
+    // rpc provider
+    this.provider = this.initializeProvider()
+    this.blockTracker = this.provider._blockTracker
 
     // eth data query tools
     this.ethQuery = new EthQuery(this.provider)
@@ -233,6 +218,36 @@ module.exports = class MetamaskController extends EventEmitter {
   // Constructor helpers
   //
 
+  initializeProvider () {
+    const providerOpts = {
+      static: {
+        eth_syncing: false,
+        web3_clientVersion: `MetaMask/v${version}`,
+      },
+      // account mgmt
+      getAccounts: (cb) => {
+        const isUnlocked = this.keyringController.memStore.getState().isUnlocked
+        const result = []
+        const selectedAddress = this.preferencesController.getSelectedAddress()
+
+        // only show address if account is unlocked
+        if (isUnlocked && selectedAddress) {
+          result.push(selectedAddress)
+        }
+        cb(null, result)
+      },
+      // tx signing
+      processTransaction: nodeify(async (txParams) => await this.txController.newUnapprovedTransaction(txParams), this),
+      // old style msg signing
+      processMessage: this.newUnsignedMessage.bind(this),
+      // personal_sign msg signing
+      processPersonalMessage: this.newUnsignedPersonalMessage.bind(this),
+      processTypedMessage: this.newUnsignedTypedMessage.bind(this),
+    }
+    const providerProxy = this.networkController.initializeProvider(providerOpts)
+    return providerProxy
+  }
+
   initPublicConfigStore () {
     // get init state
     const publicConfigStore = new ObservableStore()
@@ -468,18 +483,6 @@ module.exports = class MetamaskController extends EventEmitter {
   // Opinionated Keyring Management
   //
 
-  async getAccounts () {
-    const isUnlocked = this.keyringController.memStore.getState().isUnlocked
-    const result = []
-    const selectedAddress = this.preferencesController.getSelectedAddress()
-
-    // only show address if account is unlocked
-    if (isUnlocked && selectedAddress) {
-      result.push(selectedAddress)
-    }
-    return result
-  }
-
   addNewAccount (cb) {
     const primaryKeyring = this.keyringController.getKeyringsByType('HD Key Tree')[0]
     if (!primaryKeyring) return cb(new Error('MetamaskController - No HD Key Tree found'))
@@ -526,11 +529,6 @@ module.exports = class MetamaskController extends EventEmitter {
   // Identity Management
   //
 
-  // this function wrappper lets us pass the fn reference before txController is instantiated
-  async newTransaction (txParams) {
-    return await this.txController.newUnapprovedTransaction(txParams)
-  }
-
   newUnsignedMessage (msgParams, cb) {
     const msgId = this.messageManager.addUnapprovedMessage(msgParams)
     this.sendUpdate()