🐛Lazy generate linker values. (ampproject#18640)

* lazy generate

* add test

* return

extensions/amp-analytics/0.1/linker-manager.js

@@ -53,7 +53,7 @@ export class LinkerManager {
     this.allLinkerPromises_ = [];
 
     /** @private {!JsonObject} */
-    this.resolvedLinkers_ = dict();
+    this.resolvedIds_ = dict();
 
     /** @private {!../../../src/service/url-impl.Url} */
     this.urlService_ = Services.urlForDoc(this.ampdoc_);
@@ -101,8 +101,7 @@ export class LinkerManager {
             expandedIds[keys[i]] = value;
           }
         });
-        this.resolvedLinkers_[name] =
-            createLinker(/* version */ '1', expandedIds);
+        this.resolvedIds_[name] = expandedIds;
       });
     });
 
@@ -232,7 +231,7 @@ export class LinkerManager {
     for (const linkerName in linkerConfigs) {
       // The linker param is created asynchronously. This callback should be
       // synchronous, so we skip if value is not there yet.
-      if (this.resolvedLinkers_[linkerName]) {
+      if (this.resolvedIds_[linkerName]) {
         this.maybeAppendLinker_(element, linkerName, linkerConfigs[linkerName]);
       }
     }
@@ -253,7 +252,9 @@ export class LinkerManager {
     const /** @type {Array} */ domains = config['destinationDomains'];
 
     if (this.isDomainMatch_(hostname, domains)) {
-      el.href = addParamToUrl(href, name, this.resolvedLinkers_[name]);
+      const linkerValue = createLinker(/* version */ '1',
+          this.resolvedIds_[name]);
+      el.href = addParamToUrl(href, name, linkerValue);
     }
   }
 
@@ -345,11 +346,14 @@ export class LinkerManager {
    * @param {string} linkerName
    */
   addDataToForm_(form, actionXhrMutator, linkerName) {
-    const linkerValue = this.resolvedLinkers_[linkerName];
-    if (!linkerValue) {
+    const ids = this.resolvedIds_[linkerName];
+    if (!ids) {
+      // Form was clicked before macros resolved.
       return;
     }
 
+    const linkerValue = createLinker(/* version */ '1', ids);
+
     // Runtime controls submits with `action-xhr`, so we can append the linker
     // param
     const actionXhrUrl = form.getAttribute('action-xhr');

extensions/amp-analytics/0.1/test/test-linker-manager.js

@@ -18,6 +18,10 @@ import * as experiments from '../../../../src/experiments';
 import {LinkerManager, areFriendlyDomains} from '../linker-manager';
 import {Priority} from '../../../../src/service/navigation';
 import {Services} from '../../../../src/services';
+import {
+  installLinkerReaderService,
+  linkerReaderServiceFor,
+} from '../linker-reader';
 import {installVariableService} from '../variables';
 import {mockWindowInterface} from '../../../../testing/test-helper';
 import {toggleExperiment} from '../../../../src/experiments';
@@ -179,6 +183,33 @@ describes.realWin('Linker Manager', {amp: true}, env => {
     });
   });
 
+  it('should generate a param valid for ingestion 5 min later', () => {
+    const clock = sandbox.useFakeTimers(1533329483292);
+    sandbox.stub(Date.prototype, 'getTimezoneOffset').returns(420);
+    const config = {
+      linkers: {
+        enabled: true,
+        testLinker: {
+          ids: {
+            cid: '12345',
+          },
+        },
+      },
+    };
+
+    return new LinkerManager(ampdoc, config, null).init().then(() => {
+      clock.tick(1000 * 60 * 5); // 5 minutes.
+      const linkerUrl = clickAnchor('https://www.source.com/dest?a=1');
+
+      windowInterface.history = {replaceState: () => {}};
+      windowInterface.location = {href: linkerUrl};
+
+      installLinkerReaderService(windowInterface);
+      const linkerReader = linkerReaderServiceFor(windowInterface);
+      return expect(linkerReader.get('testLinker', 'cid')).to.equal('12345');
+    });
+  });
+
   it('should respect destinationDomains config', () => {
     const config = {
       linkers: {