From 6b6168606bc86430f6b7821c9d5f1c80d0425ebf Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Wed, 29 Aug 2018 16:26:25 +0200
Subject: Bufferize videos views in redis

---
 server/lib/redis.ts | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 86 insertions(+), 2 deletions(-)

(limited to 'server/lib/redis.ts')

diff --git a/server/lib/redis.ts b/server/lib/redis.ts
index 941f7d557..0b4b41e4e 100644
--- a/server/lib/redis.ts
+++ b/server/lib/redis.ts
@@ -60,11 +60,11 @@ class Redis {
     return this.getValue(this.generateResetPasswordKey(userId))
   }
 
-  setView (ip: string, videoUUID: string) {
+  setIPVideoView (ip: string, videoUUID: string) {
     return this.setValue(this.buildViewKey(ip, videoUUID), '1', VIDEO_VIEW_LIFETIME)
   }
 
-  async isViewExists (ip: string, videoUUID: string) {
+  async isVideoIPViewExists (ip: string, videoUUID: string) {
     return this.exists(this.buildViewKey(ip, videoUUID))
   }
 
@@ -85,6 +85,52 @@ class Redis {
     return this.setObject(this.buildCachedRouteKey(req), cached, lifetime)
   }
 
+  addVideoView (videoId: number) {
+    const keyIncr = this.generateVideoViewKey(videoId)
+    const keySet = this.generateVideosViewKey()
+
+    return Promise.all([
+      this.addToSet(keySet, videoId.toString()),
+      this.increment(keyIncr)
+    ])
+  }
+
+  async getVideoViews (videoId: number, hour: number) {
+    const key = this.generateVideoViewKey(videoId, hour)
+
+    const valueString = await this.getValue(key)
+    return parseInt(valueString, 10)
+  }
+
+  async getVideosIdViewed (hour: number) {
+    const key = this.generateVideosViewKey(hour)
+
+    const stringIds = await this.getSet(key)
+    return stringIds.map(s => parseInt(s, 10))
+  }
+
+  deleteVideoViews (videoId: number, hour: number) {
+    const keySet = this.generateVideosViewKey(hour)
+    const keyIncr = this.generateVideoViewKey(videoId, hour)
+
+    return Promise.all([
+      this.deleteFromSet(keySet, videoId.toString()),
+      this.deleteKey(keyIncr)
+    ])
+  }
+
+  generateVideosViewKey (hour?: number) {
+    if (!hour) hour = new Date().getHours()
+
+    return `videos-view-h${hour}`
+  }
+
+  generateVideoViewKey (videoId: number, hour?: number) {
+    if (!hour) hour = new Date().getHours()
+
+    return `video-view-${videoId}-h${hour}`
+  }
+
   generateResetPasswordKey (userId: number) {
     return 'reset-password-' + userId
   }
@@ -107,6 +153,34 @@ class Redis {
     })
   }
 
+  private getSet (key: string) {
+    return new Promise<string[]>((res, rej) => {
+      this.client.smembers(this.prefix + key, (err, value) => {
+        if (err) return rej(err)
+
+        return res(value)
+      })
+    })
+  }
+
+  private addToSet (key: string, value: string) {
+    return new Promise<string[]>((res, rej) => {
+      this.client.sadd(this.prefix + key, value, err => err ? rej(err) : res())
+    })
+  }
+
+  private deleteFromSet (key: string, value: string) {
+    return new Promise<void>((res, rej) => {
+      this.client.srem(this.prefix + key, value, err => err ? rej(err) : res())
+    })
+  }
+
+  private deleteKey (key: string) {
+    return new Promise<void>((res, rej) => {
+      this.client.del(this.prefix + key, err => err ? rej(err) : res())
+    })
+  }
+
   private setValue (key: string, value: string, expirationMilliseconds: number) {
     return new Promise<void>((res, rej) => {
       this.client.set(this.prefix + key, value, 'PX', expirationMilliseconds, (err, ok) => {
@@ -145,6 +219,16 @@ class Redis {
     })
   }
 
+  private increment (key: string) {
+    return new Promise<number>((res, rej) => {
+      this.client.incr(this.prefix + key, (err, value) => {
+        if (err) return rej(err)
+
+        return res(value)
+      })
+    })
+  }
+
   private exists (key: string) {
     return new Promise<boolean>((res, rej) => {
       this.client.exists(this.prefix + key, (err, existsNumber) => {
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