Support video views/viewers stats in server

* Add "currentTime" and "event" body params to view endpoint
 * Merge watching and view endpoints
 * Introduce WatchAction AP activity
 * Add tables to store viewer information of local videos
 * Add endpoints to fetch video views/viewers stats of local videos
 * Refactor views/viewers handlers
 * Support "views" and "viewers" counters for both VOD and live videos

shared/server-commands/videos/video-stats-command.ts

@@ -0,0 +1,48 @@
+import { HttpStatusCode, VideoStatsOverall, VideoStatsRetention, VideoStatsTimeserie, VideoStatsTimeserieMetric } from '@shared/models'
+import { AbstractCommand, OverrideCommandOptions } from '../shared'
+
+export class VideoStatsCommand extends AbstractCommand {
+
+  getOverallStats (options: OverrideCommandOptions & {
+    videoId: number | string
+  }) {
+    const path = '/api/v1/videos/' + options.videoId + '/stats/overall'
+
+    return this.getRequestBody<VideoStatsOverall>({
+      ...options,
+      path,
+
+      implicitToken: true,
+      defaultExpectedStatus: HttpStatusCode.OK_200
+    })
+  }
+
+  getTimeserieStats (options: OverrideCommandOptions & {
+    videoId: number | string
+    metric: VideoStatsTimeserieMetric
+  }) {
+    const path = '/api/v1/videos/' + options.videoId + '/stats/timeseries/' + options.metric
+
+    return this.getRequestBody<VideoStatsTimeserie>({
+      ...options,
+      path,
+
+      implicitToken: true,
+      defaultExpectedStatus: HttpStatusCode.OK_200
+    })
+  }
+
+  getRetentionStats (options: OverrideCommandOptions & {
+    videoId: number | string
+  }) {
+    const path = '/api/v1/videos/' + options.videoId + '/stats/retention'
+
+    return this.getRequestBody<VideoStatsRetention>({
+      ...options,
+      path,
+
+      implicitToken: true,
+      defaultExpectedStatus: HttpStatusCode.OK_200
+    })
+  }
+}