1 files changed, 32 insertions, 54 deletions

diff --git a/app/scripts/lib/inpage-provider.js b/app/scripts/lib/inpage-provider.js
index fd032a673..da75c4be2 100644
--- a/app/scripts/lib/inpage-provider.js
+++ b/app/scripts/lib/inpage-provider.js
@@ -1,8 +1,9 @@
-const pipe = require('pump')
-const StreamProvider = require('web3-stream-provider')
+const pump = require('pump')
+const RpcEngine = require('json-rpc-engine')
+const createIdRemapMiddleware = require('json-rpc-engine/src/idRemapMiddleware')
+const createStreamMiddleware = require('json-rpc-middleware-stream')
 const LocalStorageStore = require('obs-store')
-const ObjectMultiplex = require('./obj-multiplex')
-const createRandomId = require('./random-id')
+const ObjectMultiplex = require('obj-multiplex')
 
 module.exports = MetamaskInpageProvider
 
@@ -10,60 +11,49 @@ function MetamaskInpageProvider (connectionStream) {
   const self = this
 
   // setup connectionStream multiplexing
-  var multiStream = self.multiStream = ObjectMultiplex()
-  pipe(
+  const mux = self.mux = new ObjectMultiplex()
+  pump(
     connectionStream,
-    multiStream,
+    mux,
     connectionStream,
     (err) => logStreamDisconnectWarning('MetaMask', err)
   )
 
   // subscribe to metamask public config (one-way)
   self.publicConfigStore = new LocalStorageStore({ storageKey: 'MetaMask-Config' })
-  pipe(
-    multiStream.createStream('publicConfig'),
+  pump(
+    mux.createStream('publicConfig'),
     self.publicConfigStore,
     (err) => logStreamDisconnectWarning('MetaMask PublicConfigStore', err)
   )
 
   // ignore phishing warning message (handled elsewhere)
-  multiStream.ignoreStream('phishing') 
+  mux.ignoreStream('phishing')
 
   // connect to async provider
-  const asyncProvider = self.asyncProvider = new StreamProvider()
-  pipe(
-    asyncProvider,
-    multiStream.createStream('provider'),
-    asyncProvider,
+  const streamMiddleware = createStreamMiddleware()
+  pump(
+    streamMiddleware.stream,
+    mux.createStream('provider'),
+    streamMiddleware.stream,
     (err) => logStreamDisconnectWarning('MetaMask RpcProvider', err)
   )
-  // start and stop polling to unblock first block lock
-
-  self.idMap = {}
-  // handle sendAsync requests via asyncProvider
-  self.sendAsync = function (payload, cb) {
-    // rewrite request ids
-    var request = eachJsonMessage(payload, (message) => {
-      var newId = createRandomId()
-      self.idMap[newId] = message.id
-      message.id = newId
-      return message
-    })
-    // forward to asyncProvider
-    asyncProvider.sendAsync(request, function (err, res) {
-      if (err) return cb(err)
-      // transform messages to original ids
-      eachJsonMessage(res, (message) => {
-        var oldId = self.idMap[message.id]
-        delete self.idMap[message.id]
-        message.id = oldId
-        return message
-      })
-      cb(null, res)
-    })
-  }
+
+  // handle sendAsync requests via dapp-side rpc engine
+  const rpcEngine = new RpcEngine()
+  rpcEngine.push(createIdRemapMiddleware())
+  rpcEngine.push(streamMiddleware)
+  self.rpcEngine = rpcEngine
+}
+
+// handle sendAsync requests via asyncProvider
+// also remap ids inbound and outbound
+MetamaskInpageProvider.prototype.sendAsync = function (payload, cb) {
+  const self = this
+  self.rpcEngine.handle(payload, cb)
 }
 
+
 MetamaskInpageProvider.prototype.send = function (payload) {
   const self = this
 
@@ -80,7 +70,7 @@ MetamaskInpageProvider.prototype.send = function (payload) {
     case 'eth_coinbase':
       // read from localStorage
       selectedAddress = self.publicConfigStore.getState().selectedAddress
-      result = selectedAddress
+      result = selectedAddress || null
       break
 
     case 'eth_uninstallFilter':
@@ -90,7 +80,7 @@ MetamaskInpageProvider.prototype.send = function (payload) {
 
     case 'net_version':
       const networkVersion = self.publicConfigStore.getState().networkVersion
-      result = networkVersion
+      result = networkVersion || null
       break
 
     // throw not-supported Error
@@ -109,10 +99,6 @@ MetamaskInpageProvider.prototype.send = function (payload) {
   }
 }
 
-MetamaskInpageProvider.prototype.sendAsync = function () {
-  throw new Error('MetamaskInpageProvider - sendAsync not overwritten')
-}
-
 MetamaskInpageProvider.prototype.isConnected = function () {
   return true
 }
@@ -121,14 +107,6 @@ MetamaskInpageProvider.prototype.isMetaMask = true
 
 // util
 
-function eachJsonMessage (payload, transformFn) {
-  if (Array.isArray(payload)) {
-    return payload.map(transformFn)
-  } else {
-    return transformFn(payload)
-  }
-}
-
 function logStreamDisconnectWarning (remoteLabel, err) {
   let warningMsg = `MetamaskInpageProvider - lost connection to ${remoteLabel}`
   if (err) warningMsg += '\n' + err.stack