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import * as debug from 'debug'
import { merge, Observable, of, ReplaySubject, Subject } from 'rxjs'
import { catchError, filter, map, switchMap, tap } from 'rxjs/operators'
import { HttpClient, HttpParams } from '@angular/common/http'
import { Injectable, NgZone } from '@angular/core'
import { ComponentPaginationLight, RestExtractor, RestService } from '@app/core'
import { buildBulkObservable } from '@app/helpers'
import { Video, VideoChannel, VideoChannelService, VideoService } from '@app/shared/shared-main'
import { ResultList, VideoChannel as VideoChannelServer, VideoSortField } from '@shared/models'
import { environment } from '../../../environments/environment'
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 videoService: VideoService,
private restService: RestService,
private ngZone: NgZone
) {
this.existsObservable = merge(
buildBulkObservable({
time: 500,
ngZone: this.ngZone,
notifierObservable: this.existsSubject,
bulkGet: this.doSubscriptionsExist.bind(this)
}),
this.myAccountSubscriptionCacheSubject
)
}
getUserSubscriptionVideos (parameters: {
videoPagination: ComponentPaginationLight
sort: VideoSortField
skipCount?: boolean
}): Observable<ResultList<Video>> {
const { videoPagination, sort, skipCount } = parameters
const pagination = this.restService.componentPaginationToRestPagination(videoPagination)
let params = new HttpParams()
params = this.restService.addRestGetParams(params, pagination, sort)
if (skipCount) params = params.set('skipCount', skipCount + '')
return this.authHttp
.get<ResultList<Video>>(UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL + '/videos', { params })
.pipe(
switchMap(res => this.videoService.extractVideos(res)),
catchError(err => this.restExtractor.handleError(err))
)
}
/**
* 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 (parameters: {
pagination: ComponentPaginationLight
search: string
}): Observable<ResultList<VideoChannel>> {
const { pagination, search } = parameters
const url = UserSubscriptionService.BASE_USER_SUBSCRIPTIONS_URL
const restPagination = this.restService.componentPaginationToRestPagination(pagination)
let params = new HttpParams()
params = this.restService.addRestGetParams(params, restPagination)
if (search) params = params.append('search', search)
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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