Merge pull request #648 from atmire/request-by-uuid-issue

Request by UUID issue

src/app/core/data/request.service.spec.ts

@@ -22,6 +22,7 @@ import {
 } from './request.models';
 import { RequestEntry } from './request.reducer';
 import { RequestService } from './request.service';
+import { parseJsonSchemaToCommandDescription } from '@angular/cli/utilities/json-schema';
 
 describe('RequestService', () => {
   let scheduler: TestScheduler;
@@ -139,13 +140,21 @@ describe('RequestService', () => {
   describe('getByUUID', () => {
     describe('if the request with the specified UUID exists in the store', () => {
       beforeEach(() => {
-        selectSpy.and.callFake(() => {
-          return () => {
-            return () => hot('a', {
+        let callCounter = 0;
+        const responses = [
+          cold('a', { // A direct hit in the request cache
             a: {
               completed: true
             }
-            });
+          }),
+          cold('b', { b: undefined }), // No hit in the index
+          cold('c', { c: undefined })  // So no mapped hit in the request cache
+        ];
+        selectSpy.and.callFake(() => {
+          return () => {
+            const response = responses[callCounter];
+            callCounter++;
+            return () => response;
           };
         });
       });
@@ -162,11 +171,19 @@ describe('RequestService', () => {
       });
     });
 
-    describe('if the request with the specified UUID doesn\'t exist in the store', () => {
+    describe(`if the request with the specified UUID doesn't exist in the store `, () => {
       beforeEach(() => {
+        let callCounter = 0;
+        const responses = [
+          cold('a', { a: undefined }), // No direct hit in the request cache
+          cold('b', { b: undefined }), // No hit in the index
+          cold('c', { c: undefined }), // So no mapped hit in the request cache
+        ];
         selectSpy.and.callFake(() => {
           return () => {
-            return () => hot('a', { a: undefined });
+            const response = responses[callCounter];
+            callCounter++;
+            return () => response;
           };
         });
       });
@@ -174,7 +191,39 @@ describe('RequestService', () => {
       it('should return an Observable of undefined', () => {
         const result = service.getByUUID(testUUID);
 
-        scheduler.expectObservable(result).toBe('b', { b: undefined });
+        scheduler.expectObservable(result).toBe('a', { a: undefined });
+      });
+    });
+
+    describe(`if the request with the specified UUID wasn't sent, because it was already cached`, () => {
+      beforeEach(() => {
+        let callCounter = 0;
+        const responses = [
+          cold('a', { a: undefined }), // No direct hit in the request cache with that UUID
+          cold('b', { b: 'otherRequestUUID' }), // A hit in the index, which returns the uuid of the cached request
+          cold('c', {   // the call to retrieve the cached request using the UUID from the index
+            c: {
+              completed: true
+            }
+          })
+        ];
+        selectSpy.and.callFake(() => {
+          return () => {
+            const response = responses[callCounter];
+            callCounter++;
+            return () => response;
+          };
+        });
+      });
+
+      it(`it should return the cached request`, () => {
+        const result = service.getByUUID(testUUID);
+
+        scheduler.expectObservable(result).toBe('c', {
+          c: {
+            completed: true
+          }
+        });
       });
     });
 

src/app/core/data/request.service.ts

@@ -2,10 +2,10 @@ import { Injectable } from '@angular/core';
 import { HttpHeaders } from '@angular/common/http';
 
 import { createSelector, MemoizedSelector, select, Store } from '@ngrx/store';
-import { Observable, race as observableRace } from 'rxjs';
-import { filter, map, mergeMap, take } from 'rxjs/operators';
+import { Observable, combineLatest as observableCombineLatest } from 'rxjs';
+import { filter, map, mergeMap, take, switchMap, startWith } from 'rxjs/operators';
 import { cloneDeep, remove } from 'lodash';
-import { hasValue, isEmpty, isNotEmpty } from '../../shared/empty.util';
+import { hasValue, isEmpty, isNotEmpty, hasValueOperator } from '../../shared/empty.util';
 import { CacheableObject } from '../cache/object-cache.reducer';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { CoreState } from '../core.reducers';
@@ -110,15 +110,19 @@ export class RequestService {
    * Retrieve a RequestEntry based on their uuid
    */
   getByUUID(uuid: string): Observable<RequestEntry> {
-    return observableRace(
-      this.store.pipe(select(entryFromUUIDSelector(uuid))),
+    return observableCombineLatest([
+      this.store.pipe(
+        select(entryFromUUIDSelector(uuid))
+      ),
       this.store.pipe(
         select(originalRequestUUIDFromRequestUUIDSelector(uuid)),
-        mergeMap((originalUUID) => {
+        switchMap((originalUUID) => {
               return this.store.pipe(select(entryFromUUIDSelector(originalUUID)))
           },
-        ))
-    ).pipe(
+        ),
+      ),
+    ]).pipe(
+      map((entries: RequestEntry[]) => entries.find((entry: RequestEntry) => hasValue(entry))),
       map((entry: RequestEntry) => {
         // Headers break after being retrieved from the store (because of lazy initialization)
         // Combining them with a new object fixes this issue
@@ -137,7 +141,13 @@ export class RequestService {
   getByHref(href: string): Observable<RequestEntry> {
     return this.store.pipe(
       select(uuidFromHrefSelector(href)),
-      mergeMap((uuid: string) => this.getByUUID(uuid))
+      mergeMap((uuid: string) => {
+        if (isNotEmpty(uuid)) {
+          return this.getByUUID(uuid);
+        } else {
+          return [undefined];
+        }
+      })
     );
   }