Revert "Revert "Etherscan provider""

3 files changed, 102 insertions, 15 deletions

diff --git a/app/scripts/background.js b/app/scripts/background.js
index 772c1de89..14293ab05 100644
--- a/app/scripts/background.js
+++ b/app/scripts/background.js
@@ -6,7 +6,7 @@ const combineStreams = require('pumpify')
 const extend = require('xtend')
 const EthStore = require('eth-store')
 const PortStream = require('./lib/port-stream.js')
-const MetaMaskProvider = require('web3-provider-engine/zero.js')
+const MetaMaskProvider = require('./lib/zero.js')
 const IdentityStore = require('./lib/idStore')
 const createTxNotification = require('./lib/tx-notification.js')
 const configManager = require('./lib/config-manager-singleton')
@@ -36,8 +36,9 @@ function handleEthRpcRequestStream(stream){
 // state and network
 //
 
+var providerConfig = configManager.getProvider()
 var idStore = new IdentityStore()
-var zeroClient = MetaMaskProvider({
+var providerOpts = {
   rpcUrl: configManager.getCurrentRpcAddress(),
   getAccounts: function(cb){
     var selectedAddress = idStore.getSelectedAddress()
@@ -46,14 +47,16 @@ var zeroClient = MetaMaskProvider({
   },
   approveTransaction: addUnconfirmedTx,
   signTransaction: idStore.signTransaction.bind(idStore),
-})
+  etherscan: providerConfig.type === 'etherscan',
+}
+var provider = MetaMaskProvider(providerOpts)
 
 // log new blocks
-zeroClient.on('block', function(block){
+provider.on('block', function(block){
   console.log('BLOCK CHANGED:', '#'+block.number.toString('hex'), '0x'+block.hash.toString('hex'))
 })
 
-var ethStore = new EthStore(zeroClient)
+var ethStore = new EthStore(provider)
 idStore.setStore(ethStore)
 
 function getState(){
@@ -68,7 +71,7 @@ function getState(){
 // handle rpc requests
 function onRpcRequest(remoteStream, payload){
   // console.log('MetaMaskPlugin - incoming payload:', payload)
-  zeroClient.sendAsync(payload, function onPayloadHandled(err, response){
+  provider.sendAsync(payload, function onPayloadHandled(err, response){
     // provider engine errors are included in response objects
     if (!payload.isMetamaskInternal) console.log('MetaMaskPlugin - RPC complete:', payload, '->', response)
     try {
@@ -111,6 +114,7 @@ function linkDnode(stream){
   var connection = Dnode({
     getState:           function(cb){ cb(null, getState()) },
     setRpcTarget:       setRpcTarget,
+    useEtherscanProvider: useEtherscanProvider,
     // forward directly to idStore
     createNewVault:     idStore.createNewVault.bind(idStore),
     recoverFromSeed:    idStore.recoverFromSeed.bind(idStore),
@@ -179,6 +183,11 @@ function setRpcTarget(rpcTarget){
   chrome.runtime.reload()
 }
 
+function useEtherscanProvider() {
+  configManager.useEtherscanProvider()
+  chrome.runtime.reload()
+}
+
 // util
 
 function jsonParseStream(){
diff --git a/app/scripts/lib/config-manager.js b/app/scripts/lib/config-manager.js
index 682b34637..121ede838 100644
--- a/app/scripts/lib/config-manager.js
+++ b/app/scripts/lib/config-manager.js
@@ -47,15 +47,6 @@ ConfigManager.prototype.setConfig = function(config) {
   this.setData(data)
 }
 
-ConfigManager.prototype.setRpcTarget = function(rpcUrl) {
-  var config = this.getConfig()
-  config.provider = {
-    type: 'rpc',
-    rpcTarget: rpcUrl,
-  }
-  this.setConfig(config)
-}
-
 ConfigManager.prototype.getConfig = function() {
   var data = this.migrator.getData()
   if ('config' in data) {
@@ -70,6 +61,28 @@ ConfigManager.prototype.getConfig = function() {
   }
 }
 
+ConfigManager.prototype.setRpcTarget = function(rpcUrl) {
+  var config = this.getConfig()
+  config.provider = {
+    type: 'rpc',
+    rpcTarget: rpcUrl,
+  }
+  this.setConfig(config)
+}
+
+ConfigManager.prototype.useEtherscanProvider = function() {
+  var config = this.getConfig()
+  config.provider = {
+    type: 'etherscan',
+  }
+  this.setConfig(config)
+}
+
+ConfigManager.prototype.getProvider = function() {
+  var config = this.getConfig()
+  return config.provider
+}
+
 ConfigManager.prototype.setData = function(data) {
   this.migrator.saveData(data)
 }
diff --git a/app/scripts/lib/zero.js b/app/scripts/lib/zero.js
new file mode 100644
index 000000000..d33f099d3
--- /dev/null
+++ b/app/scripts/lib/zero.js
@@ -0,0 +1,65 @@
+const ProviderEngine = require('web3-provider-engine/index.js')
+const DefaultFixture = require('web3-provider-engine/subproviders/default-fixture.js')
+const NonceTrackerSubprovider = require('web3-provider-engine/subproviders/nonce-tracker.js')
+const CacheSubprovider = require('web3-provider-engine/subproviders/cache.js')
+const FilterSubprovider = require('web3-provider-engine/subproviders/filters.js')
+const HookedWalletSubprovider = require('web3-provider-engine/subproviders/hooked-wallet.js')
+const RpcSubprovider = require('web3-provider-engine/subproviders/rpc.js')
+const EtherscanSubprovider = require('web3-provider-engine/subproviders/etherscan.js')
+
+
+module.exports = ZeroClientProvider
+
+
+function ZeroClientProvider(opts){
+  opts = opts || {}
+
+  var engine = new ProviderEngine()
+
+  // static
+  var staticSubprovider = new DefaultFixture()
+  engine.addProvider(staticSubprovider)
+
+  // nonce tracker
+  engine.addProvider(new NonceTrackerSubprovider())
+
+  // cache layer
+  var cacheSubprovider = new CacheSubprovider()
+  engine.addProvider(cacheSubprovider)
+
+  // filters
+  var filterSubprovider = new FilterSubprovider()
+  engine.addProvider(filterSubprovider)
+
+  // id mgmt
+  var idmgmtSubprovider = new HookedWalletSubprovider({
+    getAccounts: opts.getAccounts,
+    approveTransaction: opts.approveTransaction,
+    signTransaction: opts.signTransaction,
+  })
+  engine.addProvider(idmgmtSubprovider)
+
+  // data source
+  var dataProvider
+  if (!opts.etherscan) {
+    dataProvider = new RpcSubprovider({
+      rpcUrl: opts.rpcUrl || 'https://testrpc.metamask.io/',
+    })
+  } else {
+    dataProvider = new EtherscanSubprovider()
+  }
+  engine.addProvider(dataProvider)
+
+  // // log new blocks
+  // engine.on('block', function(block){
+  //   console.log('================================')
+  //   console.log('BLOCK CHANGED:', '#'+block.number.toString('hex'), '0x'+block.hash.toString('hex'))
+  //   console.log('================================')
+  // })
+
+  // start polling
+  engine.start()
+
+  return engine
+
+}