client/src/app/shared/user-subscription/user-subscription.service.ts

   1 import { bufferTime, catchError, filter, map, observeOn, share, switchMap, tap } from 'rxjs/operators'
   2 import { asyncScheduler, merge, Observable, of, ReplaySubject, Subject } from 'rxjs'
   3 import { HttpClient, HttpParams } from '@angular/common/http'
   4 import { Injectable, NgZone } from '@angular/core'
   5 import { ResultList } from '../../../../../shared'
   6 import { environment } from '../../../environments/environment'
   7 import { RestExtractor, RestService } from '../rest'
   8 import { VideoChannel } from '@app/shared/video-channel/video-channel.model'
   9 import { VideoChannelService } from '@app/shared/video-channel/video-channel.service'
  10 import { VideoChannel as VideoChannelServer } from '../../../../../shared/models/videos'
  11 import { ComponentPaginationLight } from '@app/shared/rest/component-pagination.model'
  12 import { uniq } from 'lodash-es'
  13 import * as debug from 'debug'
  14 import { enterZone, leaveZone } from '@app/shared/rxjs/zone'
  15
  16 const logger = debug('peertube:subscriptions:UserSubscriptionService')
  17
  18 type SubscriptionExistResult = { [ uri: string ]: boolean }
  19 type SubscriptionExistResultObservable = { [ uri: string ]: Observable<boolean> }
  20
  21 @Injectable()
  22 export class UserSubscriptionService {
  23   static BASE_USER_SUBSCRIPTIONS_URL = environment.apiUrl + '/api/v1/users/me/subscriptions'
  24
  25   // Use a replay subject because we "next" a value before subscribing
  26   private existsSubject = new ReplaySubject<string>(1)
  27   private readonly existsObservable: Observable<SubscriptionExistResult>
  28
  29   private myAccountSubscriptionCache: SubscriptionExistResult = {}
  30   private myAccountSubscriptionCacheObservable: SubscriptionExistResultObservable = {}
  31   private myAccountSubscriptionCacheSubject = new Subject<SubscriptionExistResult>()
  32
  33   constructor (
  34     private authHttp: HttpClient,
  35     private restExtractor: RestExtractor,
  36     private restService: RestService,
  37     private ngZone: NgZone
  38   ) {
  39     this.existsObservable = merge(
  40       this.existsSubject.pipe(
  41         // We leave Angular zone so Protractor does not get stuck
  42         bufferTime(500, leaveZone(this.ngZone, asyncScheduler)),
  43         filter(uris => uris.length !== 0),
  44         map(uris => uniq(uris)),
  45         observeOn(enterZone(this.ngZone, asyncScheduler)),
  46         switchMap(uris => this.doSubscriptionsExist(uris)),
  47         share()
  48       ),
  49
  50       this.myAccountSubscriptionCacheSubject
  51     )
  52   }
  53
  54   /**
  55    * Subscription part
  56    */
  57
  58   deleteSubscription (nameWithHost: string) {
  59     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/' + nameWithHost
  60
  61     return this.authHttp.delete(url)
  62                .pipe(
  63                  map(this.restExtractor.extractDataBool),
  64                  tap(() => {
  65                    this.myAccountSubscriptionCache[nameWithHost] = false
  66
  67                    this.myAccountSubscriptionCacheSubject.next(this.myAccountSubscriptionCache)
  68                  }),
  69                  catchError(err => this.restExtractor.handleError(err))
  70                )
  71   }
  72
  73   addSubscription (nameWithHost: string) {
  74     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
  75
  76     const body = { uri: nameWithHost }
  77     return this.authHttp.post(url, body)
  78                .pipe(
  79                  map(this.restExtractor.extractDataBool),
  80                  tap(() => {
  81                    this.myAccountSubscriptionCache[nameWithHost] = true
  82
  83                    this.myAccountSubscriptionCacheSubject.next(this.myAccountSubscriptionCache)
  84                  }),
  85                  catchError(err => this.restExtractor.handleError(err))
  86                )
  87   }
  88
  89   listSubscriptions (componentPagination: ComponentPaginationLight): Observable<ResultList<VideoChannel>> {
  90     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
  91
  92     const pagination = this.restService.componentPaginationToRestPagination(componentPagination)
  93
  94     let params = new HttpParams()
  95     params = this.restService.addRestGetParams(params, pagination)
  96
  97     return this.authHttp.get<ResultList<VideoChannelServer>>(url, { params })
  98                .pipe(
  99                  map(res => VideoChannelService.extractVideoChannels(res)),
 100                  catchError(err => this.restExtractor.handleError(err))
 101                )
 102   }
 103
 104   /**
 105    * SubscriptionExist part
 106    */
 107
 108   listenToMyAccountSubscriptionCacheSubject () {
 109     return this.myAccountSubscriptionCacheSubject.asObservable()
 110   }
 111
 112   listenToSubscriptionCacheChange (nameWithHost: string) {
 113     if (nameWithHost in this.myAccountSubscriptionCacheObservable) {
 114       return this.myAccountSubscriptionCacheObservable[ nameWithHost ]
 115     }
 116
 117     const obs = this.existsObservable
 118                     .pipe(
 119                       filter(existsResult => existsResult[ nameWithHost ] !== undefined),
 120                       map(existsResult => existsResult[ nameWithHost ])
 121                     )
 122
 123     this.myAccountSubscriptionCacheObservable[ nameWithHost ] = obs
 124     return obs
 125   }
 126
 127   doesSubscriptionExist (nameWithHost: string) {
 128     logger('Running subscription check for %d.', nameWithHost)
 129
 130     if (nameWithHost in this.myAccountSubscriptionCache) {
 131       logger('Found cache for %d.', nameWithHost)
 132
 133       return of(this.myAccountSubscriptionCache[ nameWithHost ])
 134     }
 135
 136     this.existsSubject.next(nameWithHost)
 137
 138     logger('Fetching from network for %d.', nameWithHost)
 139     return this.existsObservable.pipe(
 140       filter(existsResult => existsResult[ nameWithHost ] !== undefined),
 141       map(existsResult => existsResult[ nameWithHost ]),
 142       tap(result => this.myAccountSubscriptionCache[ nameWithHost ] = result)
 143     )
 144   }
 145
 146   private doSubscriptionsExist (uris: string[]): Observable<SubscriptionExistResult> {
 147     const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/exist'
 148     let params = new HttpParams()
 149
 150     params = this.restService.addObjectParams(params, { uris })
 151
 152     return this.authHttp.get<SubscriptionExistResult>(url, { params })
 153                .pipe(
 154                  tap(res => {
 155                    this.myAccountSubscriptionCache = {
 156                      ...this.myAccountSubscriptionCache,
 157                      ...res
 158                    }
 159                  }),
 160                  catchError(err => this.restExtractor.handleError(err))
 161                )
 162   }
 163 }