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import { bufferTime, catchError, filter, map, observeOn, share, switchMap, tap } from 'rxjs/operators'
import { asyncScheduler, merge, Observable, of, ReplaySubject, Subject } from 'rxjs'
import { HttpClient, HttpParams } from '@angular/common/http'
import { Injectable, NgZone } from '@angular/core'
import { ResultList } from '../../../../../shared'
import { environment } from '../../../environments/environment'
import { RestExtractor, RestService } from '../rest'
import { VideoChannel } from '@app/shared/video-channel/video-channel.model'
import { VideoChannelService } from '@app/shared/video-channel/video-channel.service'
import { VideoChannel as VideoChannelServer } from '../../../../../shared/models/videos'
import { ComponentPaginationLight } from '@app/shared/rest/component-pagination.model'
import { uniq } from 'lodash-es'
import * as debug from 'debug'
import { enterZone, leaveZone } from '@app/shared/rxjs/zone'
const logger = debug('peertube:subscriptions:UserSubscriptionService')
type SubscriptionExistResult = { [ uri: string ]: boolean }
type SubscriptionExistResultObservable = { [ uri: string ]: Observable<boolean> }
@Injectable()
export class UserSubscriptionService {
static BASE_USER_SUBSCRIPTIONS_URL = environment.apiUrl + '/api/v1/users/me/subscriptions'
// Use a replay subject because we "next" a value before subscribing
private existsSubject = new ReplaySubject<string>(1)
private readonly existsObservable: Observable<SubscriptionExistResult>
private myAccountSubscriptionCache: SubscriptionExistResult = {}
private myAccountSubscriptionCacheObservable: SubscriptionExistResultObservable = {}
private myAccountSubscriptionCacheSubject = new Subject<SubscriptionExistResult>()
constructor (
private authHttp: HttpClient,
private restExtractor: RestExtractor,
private restService: RestService,
private ngZone: NgZone
) {
this.existsObservable = merge(
this.existsSubject.pipe(
// We leave Angular zone so Protractor does not get stuck
bufferTime(500, leaveZone(this.ngZone, asyncScheduler)),
filter(uris => uris.length !== 0),
map(uris => uniq(uris)),
observeOn(enterZone(this.ngZone, asyncScheduler)),
switchMap(uris => this.doSubscriptionsExist(uris)),
share()
),
this.myAccountSubscriptionCacheSubject
)
}
/**
* Subscription part
*/
deleteSubscription (nameWithHost: string) {
const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/' + nameWithHost
return this.authHttp.delete(url)
.pipe(
map(this.restExtractor.extractDataBool),
tap(() => {
this.myAccountSubscriptionCache[nameWithHost] = false
this.myAccountSubscriptionCacheSubject.next(this.myAccountSubscriptionCache)
}),
catchError(err => this.restExtractor.handleError(err))
)
}
addSubscription (nameWithHost: string) {
const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
const body = { uri: nameWithHost }
return this.authHttp.post(url, body)
.pipe(
map(this.restExtractor.extractDataBool),
tap(() => {
this.myAccountSubscriptionCache[nameWithHost] = true
this.myAccountSubscriptionCacheSubject.next(this.myAccountSubscriptionCache)
}),
catchError(err => this.restExtractor.handleError(err))
)
}
listSubscriptions (componentPagination: ComponentPaginationLight): Observable<ResultList<VideoChannel>> {
const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
const pagination = this.restService.componentPaginationToRestPagination(componentPagination)
let params = new HttpParams()
params = this.restService.addRestGetParams(params, pagination)
return this.authHttp.get<ResultList<VideoChannelServer>>(url, { params })
.pipe(
map(res => VideoChannelService.extractVideoChannels(res)),
catchError(err => this.restExtractor.handleError(err))
)
}
/**
* SubscriptionExist part
*/
listenToMyAccountSubscriptionCacheSubject () {
return this.myAccountSubscriptionCacheSubject.asObservable()
}
listenToSubscriptionCacheChange (nameWithHost: string) {
if (nameWithHost in this.myAccountSubscriptionCacheObservable) {
return this.myAccountSubscriptionCacheObservable[ nameWithHost ]
}
const obs = this.existsObservable
.pipe(
filter(existsResult => existsResult[ nameWithHost ] !== undefined),
map(existsResult => existsResult[ nameWithHost ])
)
this.myAccountSubscriptionCacheObservable[ nameWithHost ] = obs
return obs
}
doesSubscriptionExist (nameWithHost: string) {
logger('Running subscription check for %d.', nameWithHost)
if (nameWithHost in this.myAccountSubscriptionCache) {
logger('Found cache for %d.', nameWithHost)
return of(this.myAccountSubscriptionCache[ nameWithHost ])
}
this.existsSubject.next(nameWithHost)
logger('Fetching from network for %d.', nameWithHost)
return this.existsObservable.pipe(
filter(existsResult => existsResult[ nameWithHost ] !== undefined),
map(existsResult => existsResult[ nameWithHost ]),
tap(result => this.myAccountSubscriptionCache[ nameWithHost ] = result)
)
}
private doSubscriptionsExist (uris: string[]): Observable<SubscriptionExistResult> {
const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/exist'
let params = new HttpParams()
params = this.restService.addObjectParams(params, { uris })
return this.authHttp.get<SubscriptionExistResult>(url, { params })
.pipe(
tap(res => {
this.myAccountSubscriptionCache = {
...this.myAccountSubscriptionCache,
...res
}
}),
catchError(err => this.restExtractor.handleError(err))
)
}
}
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