use one segment instance (#10915)

Author: brad-decker

app/scripts/controllers/metametrics.js

@@ -57,8 +57,6 @@ export default class MetaMetricsController {
   /**
    * @param {Object} segment - an instance of analytics-node for tracking
    *  events that conform to the new MetaMetrics tracking plan.
-   * @param {Object} segmentLegacy - an instance of analytics-node for
-   *  tracking legacy schema events. Will eventually be phased out
    * @param {Object} preferencesStore - The preferences controller store, used
    *  to access and subscribe to preferences that will be attached to events
    * @param {function} onNetworkDidChange - Used to attach a listener to the
@@ -73,7 +71,6 @@ export default class MetaMetricsController {
    */
   constructor({
     segment,
-    segmentLegacy,
     preferencesStore,
     onNetworkDidChange,
     getCurrentChainId,
@@ -105,7 +102,6 @@ export default class MetaMetricsController {
       this.network = getNetworkIdentifier();
     });
     this.segment = segment;
-    this.segmentLegacy = segmentLegacy;
   }
 
   generateMetaMetricsId() {
@@ -260,6 +256,12 @@ export default class MetaMetricsController {
     }
     payload[idType] = idValue;
 
+    // If this is an event on the old matomo schema, add a key to the payload
+    // to designate it as such
+    if (matomoEvent === true) {
+      payload.properties.legacy_event = true;
+    }
+
     // Promises will only resolve when the event is sent to segment. For any
     // event that relies on this promise being fulfilled before performing UI
     // updates, or otherwise delaying user interaction, supply the
@@ -278,11 +280,9 @@ export default class MetaMetricsController {
         return resolve();
       };
 
-      const target = matomoEvent === true ? this.segmentLegacy : this.segment;
-
-      target.track(payload, callback);
+      this.segment.track(payload, callback);
       if (flushImmediately) {
-        target.flush();
+        this.segment.flush();
       }
     });
   }

app/scripts/controllers/metametrics.test.js

@@ -11,7 +11,6 @@ import MetaMetricsController from './metametrics';
 import { NETWORK_EVENTS } from './network';
 
 const segment = createSegmentMock(2, 10000);
-const segmentLegacy = createSegmentMock(2, 10000);
 
 const VERSION = '0.0.1-test';
 const NETWORK = 'Mainnet';
@@ -91,7 +90,6 @@ function getMetaMetricsController({
 } = {}) {
   return new MetaMetricsController({
     segment,
-    segmentLegacy,
     getNetworkIdentifier: networkController.getNetworkIdentifier.bind(
       networkController,
     ),
@@ -286,7 +284,7 @@ describe('MetaMetricsController', function () {
     });
 
     it('should track a legacy event', function () {
-      const mock = sinon.mock(segmentLegacy);
+      const mock = sinon.mock(segment);
       const metaMetricsController = getMetaMetricsController();
       mock
         .expects('track')
@@ -297,6 +295,7 @@ describe('MetaMetricsController', function () {
           context: DEFAULT_TEST_CONTEXT,
           properties: {
             test: 1,
+            legacy_event: true,
             ...DEFAULT_EVENT_PROPERTIES,
           },
         });
@@ -544,7 +543,6 @@ describe('MetaMetricsController', function () {
   afterEach(function () {
     // flush the queues manually after each test
     segment.flush();
-    segmentLegacy.flush();
     sinon.restore();
   });
 });

app/scripts/lib/segment.js

@@ -4,7 +4,6 @@ const isDevOrTestEnvironment = Boolean(
   process.env.METAMASK_DEBUG || process.env.IN_TEST,
 );
 const SEGMENT_WRITE_KEY = process.env.SEGMENT_WRITE_KEY ?? null;
-const SEGMENT_LEGACY_WRITE_KEY = process.env.SEGMENT_LEGACY_WRITE_KEY ?? null;
 const SEGMENT_HOST = process.env.SEGMENT_HOST ?? null;
 
 // flushAt controls how many events are sent to segment at once. Segment will
@@ -90,12 +89,3 @@ export const segment =
         flushAt: SEGMENT_FLUSH_AT,
         flushInterval: SEGMENT_FLUSH_INTERVAL,
       });
-
-export const segmentLegacy =
-  !SEGMENT_LEGACY_WRITE_KEY || (isDevOrTestEnvironment && !SEGMENT_HOST)
-    ? createSegmentMock(SEGMENT_FLUSH_AT, SEGMENT_FLUSH_INTERVAL)
-    : new Analytics(SEGMENT_LEGACY_WRITE_KEY, {
-        host: SEGMENT_HOST,
-        flushAt: SEGMENT_FLUSH_AT,
-        flushInterval: SEGMENT_FLUSH_INTERVAL,
-      });

app/scripts/metamask-controller.js

@@ -58,7 +58,7 @@ import nodeify from './lib/nodeify';
 import accountImporter from './account-import-strategies';
 import seedPhraseVerifier from './lib/seed-phrase-verifier';
 import MetaMetricsController from './controllers/metametrics';
-import { segment, segmentLegacy } from './lib/segment';
+import { segment } from './lib/segment';
 import createMetaRPCHandler from './lib/createMetaRPCHandler';
 
 export const METAMASK_CONTROLLER_EVENTS = {
@@ -128,7 +128,6 @@ export default class MetamaskController extends EventEmitter {
 
     this.metaMetricsController = new MetaMetricsController({
       segment,
-      segmentLegacy,
       preferencesStore: this.preferencesController.store,
       onNetworkDidChange: this.networkController.on.bind(
         this.networkController,