Merge pull request #1474 from MetaMask/i1458-StreamingSubprovider

Fix filter polling leak

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Current Master
 
+- Fix bug where website filters would pile up and not deallocate when leaving a site.
+
 ## 3.6.5 2017-5-17
 
 - Fix bug where edited gas parameters would not take effect.

app/scripts/lib/inpage-provider.js

@@ -1,5 +1,7 @@
 const pipe = require('pump')
-const StreamProvider = require('web3-stream-provider')
+const ProviderEngine = require('web3-provider-engine')
+const FilterSubprovider = require('web3-provider-engine/subproviders/filters')
+const StreamSubprovider = require('web3-provider-engine/subproviders/stream')
 const LocalStorageStore = require('obs-store')
 const ObjectMultiplex = require('./obj-multiplex')
 const createRandomId = require('./random-id')
@@ -27,14 +29,24 @@ function MetamaskInpageProvider (connectionStream) {
   )
 
   // connect to async provider
-  const asyncProvider = self.asyncProvider = new StreamProvider()
+  const engine = new ProviderEngine()
+
+  const filterSubprovider = new FilterSubprovider()
+  engine.addProvider(filterSubprovider)
+
+  const streamSubprovider = new StreamSubprovider()
+  engine.addProvider(streamSubprovider)
+
   pipe(
-    asyncProvider,
+    streamSubprovider,
     multiStream.createStream('provider'),
-    asyncProvider,
+    streamSubprovider,
     (err) => logStreamDisconnectWarning('MetaMask RpcProvider', err)
   )
 
+  // start polling
+  engine.start()
+
   self.idMap = {}
   // handle sendAsync requests via asyncProvider
   self.sendAsync = function (payload, cb) {
@@ -46,7 +58,7 @@ function MetamaskInpageProvider (connectionStream) {
       return message
     })
     // forward to asyncProvider
-    asyncProvider.sendAsync(request, function (err, res) {
+    engine.sendAsync(request, function (err, res) {
       if (err) return cb(err)
       // transform messages to original ids
       eachJsonMessage(res, (message) => {

package.json

@@ -121,7 +121,7 @@
     "valid-url": "^1.0.9",
     "vreme": "^3.0.2",
     "web3": "0.18.2",
-    "web3-provider-engine": "^12.0.6",
+    "web3-provider-engine": "^12.1.0",
     "web3-stream-provider": "^2.0.6",
     "xtend": "^4.0.1"
   },