From 354f8c0d7de8ff2611988f9839c2072295c955ae Mon Sep 17 00:00:00 2001
From: kumavis <aaron@kumavis.me>
Date: Mon, 8 Oct 2018 11:55:07 -0400
Subject: provider - enable subscription support (newHeads, logs)

---
 .../controllers/network/createInfuraClient.js        | 10 ++++++----
 app/scripts/metamask-controller.js                   | 20 +++++++++++++++-----
 2 files changed, 21 insertions(+), 9 deletions(-)

(limited to 'app/scripts')

diff --git a/app/scripts/controllers/network/createInfuraClient.js b/app/scripts/controllers/network/createInfuraClient.js
index 41af4d9f9..326bcb355 100644
--- a/app/scripts/controllers/network/createInfuraClient.js
+++ b/app/scripts/controllers/network/createInfuraClient.js
@@ -1,5 +1,6 @@
 const mergeMiddleware = require('json-rpc-engine/src/mergeMiddleware')
-const createBlockReEmitMiddleware = require('eth-json-rpc-middleware/block-reemit')
+const createBlockReRefMiddleware = require('eth-json-rpc-middleware/block-ref')
+const createRetryOnEmptyMiddleware = require('eth-json-rpc-middleware/retryOnEmpty')
 const createBlockCacheMiddleware = require('eth-json-rpc-middleware/block-cache')
 const createInflightMiddleware = require('eth-json-rpc-middleware/inflight-cache')
 const createBlockTrackerInspectorMiddleware = require('eth-json-rpc-middleware/block-tracker-inspector')
@@ -11,13 +12,14 @@ module.exports = createInfuraClient
 
 function createInfuraClient ({ network }) {
   const infuraMiddleware = createInfuraMiddleware({ network })
-  const blockProvider = providerFromMiddleware(infuraMiddleware)
-  const blockTracker = new BlockTracker({ provider: blockProvider })
+  const infuraProvider = providerFromMiddleware(infuraMiddleware)
+  const blockTracker = new BlockTracker({ provider: infuraProvider })
 
   const networkMiddleware = mergeMiddleware([
     createBlockCacheMiddleware({ blockTracker }),
     createInflightMiddleware(),
-    createBlockReEmitMiddleware({ blockTracker, provider: blockProvider }),
+    createBlockReRefMiddleware({ blockTracker, provider: infuraProvider }),
+    createRetryOnEmptyMiddleware({ blockTracker, provider: infuraProvider }),
     createBlockTrackerInspectorMiddleware({ blockTracker }),
     infuraMiddleware,
   ])
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 34ca80dd7..a59be7744 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -15,6 +15,7 @@ const RpcEngine = require('json-rpc-engine')
 const debounce = require('debounce')
 const createEngineStream = require('json-rpc-middleware-stream/engineStream')
 const createFilterMiddleware = require('eth-json-rpc-filters')
+const createSubscriptionManager = require('eth-json-rpc-filters/subscriptionManager')
 const createOriginMiddleware = require('./lib/createOriginMiddleware')
 const createLoggerMiddleware = require('./lib/createLoggerMiddleware')
 const createProviderMiddleware = require('./lib/createProviderMiddleware')
@@ -1246,24 +1247,33 @@ module.exports = class MetamaskController extends EventEmitter {
   setupProviderConnection (outStream, origin) {
     // setup json rpc engine stack
     const engine = new RpcEngine()
+    const provider = this.provider
+    const blockTracker = this.blockTracker
 
     // create filter polyfill middleware
-    const filterMiddleware = createFilterMiddleware({
-      provider: this.provider,
-      blockTracker: this.blockTracker,
-    })
+    const filterMiddleware = createFilterMiddleware({ provider, blockTracker })
+    // create subscription polyfill middleware
+    const subscriptionManager = createSubscriptionManager({ provider, blockTracker })
+    subscriptionManager.events.on('notification', (message) => engine.emit('notification', message))
 
+    // metadata
     engine.push(createOriginMiddleware({ origin }))
     engine.push(createLoggerMiddleware({ origin }))
+    // filter and subscription polyfills
     engine.push(filterMiddleware)
+    engine.push(subscriptionManager.middleware)
+    // watch asset
     engine.push(this.preferencesController.requestWatchAsset.bind(this.preferencesController))
+    // sign typed data middleware
     engine.push(this.createTypedDataMiddleware('eth_signTypedData', 'V1').bind(this))
     engine.push(this.createTypedDataMiddleware('eth_signTypedData_v1', 'V1').bind(this))
     engine.push(this.createTypedDataMiddleware('eth_signTypedData_v3', 'V3', true).bind(this))
-    engine.push(createProviderMiddleware({ provider: this.provider }))
+    // forward to metamask primary provider
+    engine.push(createProviderMiddleware({ provider }))
 
     // setup connection
     const providerStream = createEngineStream({ engine })
+
     pump(
       outStream,
       providerStream,
-- 
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