Add like/dislike system for videos

server/controllers/api/videos.js

@@ -60,6 +60,12 @@ router.post('/:id/abuse',
   reportVideoAbuseRetryWrapper
 )
 
+router.put('/:id/rate',
+  oAuth.authenticate,
+  validatorsVideos.videoRate,
+  rateVideoRetryWrapper
+)
+
 router.get('/',
   validatorsPagination.pagination,
   validatorsSort.videosSort,
@@ -104,6 +110,147 @@ module.exports = router
 
 // ---------------------------------------------------------------------------
 
+function rateVideoRetryWrapper (req, res, next) {
+  const options = {
+    arguments: [ req, res ],
+    errorMessage: 'Cannot update the user video rate.'
+  }
+
+  databaseUtils.retryTransactionWrapper(rateVideo, options, function (err) {
+    if (err) return next(err)
+
+    return res.type('json').status(204).end()
+  })
+}
+
+function rateVideo (req, res, finalCallback) {
+  const rateType = req.body.rating
+  const videoInstance = res.locals.video
+  const userInstance = res.locals.oauth.token.User
+
+  waterfall([
+    databaseUtils.startSerializableTransaction,
+
+    function findPreviousRate (t, callback) {
+      db.UserVideoRate.load(userInstance.id, videoInstance.id, t, function (err, previousRate) {
+        return callback(err, t, previousRate)
+      })
+    },
+
+    function insertUserRateIntoDB (t, previousRate, callback) {
+      const options = { transaction: t }
+
+      let likesToIncrement = 0
+      let dislikesToIncrement = 0
+
+      if (rateType === constants.VIDEO_RATE_TYPES.LIKE) likesToIncrement++
+      else if (rateType === constants.VIDEO_RATE_TYPES.DISLIKE) dislikesToIncrement++
+
+      // There was a previous rate, update it
+      if (previousRate) {
+        // We will remove the previous rate, so we will need to remove it from the video attribute
+        if (previousRate.type === constants.VIDEO_RATE_TYPES.LIKE) likesToIncrement--
+        else if (previousRate.type === constants.VIDEO_RATE_TYPES.DISLIKE) dislikesToIncrement--
+
+        previousRate.type = rateType
+
+        previousRate.save(options).asCallback(function (err) {
+          return callback(err, t, likesToIncrement, dislikesToIncrement)
+        })
+      } else { // There was not a previous rate, insert a new one
+        const query = {
+          userId: userInstance.id,
+          videoId: videoInstance.id,
+          type: rateType
+        }
+
+        db.UserVideoRate.create(query, options).asCallback(function (err) {
+          return callback(err, t, likesToIncrement, dislikesToIncrement)
+        })
+      }
+    },
+
+    function updateVideoAttributeDB (t, likesToIncrement, dislikesToIncrement, callback) {
+      const options = { transaction: t }
+      const incrementQuery = {
+        likes: likesToIncrement,
+        dislikes: dislikesToIncrement
+      }
+
+      // Even if we do not own the video we increment the attributes
+      // It is usefull for the user to have a feedback
+      videoInstance.increment(incrementQuery, options).asCallback(function (err) {
+        return callback(err, t, likesToIncrement, dislikesToIncrement)
+      })
+    },
+
+    function sendEventsToFriendsIfNeeded (t, likesToIncrement, dislikesToIncrement, callback) {
+      // No need for an event type, we own the video
+      if (videoInstance.isOwned()) return callback(null, t, likesToIncrement, dislikesToIncrement)
+
+      const eventsParams = []
+
+      if (likesToIncrement !== 0) {
+        eventsParams.push({
+          videoId: videoInstance.id,
+          type: constants.REQUEST_VIDEO_EVENT_TYPES.LIKES,
+          count: likesToIncrement
+        })
+      }
+
+      if (dislikesToIncrement !== 0) {
+        eventsParams.push({
+          videoId: videoInstance.id,
+          type: constants.REQUEST_VIDEO_EVENT_TYPES.DISLIKES,
+          count: dislikesToIncrement
+        })
+      }
+
+      friends.addEventsToRemoteVideo(eventsParams, t, function (err) {
+        return callback(err, t, likesToIncrement, dislikesToIncrement)
+      })
+    },
+
+    function sendQaduToFriendsIfNeeded (t, likesToIncrement, dislikesToIncrement, callback) {
+      // We do not own the video, there is no need to send a quick and dirty update to friends
+      // Our rate was already sent by the addEvent function
+      if (videoInstance.isOwned() === false) return callback(null, t)
+
+      const qadusParams = []
+
+      if (likesToIncrement !== 0) {
+        qadusParams.push({
+          videoId: videoInstance.id,
+          type: constants.REQUEST_VIDEO_QADU_TYPES.LIKES
+        })
+      }
+
+      if (dislikesToIncrement !== 0) {
+        qadusParams.push({
+          videoId: videoInstance.id,
+          type: constants.REQUEST_VIDEO_QADU_TYPES.DISLIKES
+        })
+      }
+
+      friends.quickAndDirtyUpdatesVideoToFriends(qadusParams, t, function (err) {
+        return callback(err, t)
+      })
+    },
+
+    databaseUtils.commitTransaction
+
+  ], function (err, t) {
+    if (err) {
+      // This is just a debug because we will retry the insert
+      logger.debug('Cannot add the user video rate.', { error: err })
+      return databaseUtils.rollbackTransaction(err, t, finalCallback)
+    }
+
+    logger.info('User video rate for video %s of user %s updated.', videoInstance.name, userInstance.username)
+    return finalCallback(null)
+  })
+}
+
 // Wrapper to video add that retry the function if there is a database error
 // We need this because we run the transaction in SERIALIZABLE isolation that can fail
 function addVideoRetryWrapper (req, res, next) {
@@ -155,8 +302,7 @@ function addVideo (req, res, videoFile, finalCallback) {
         extname: path.extname(videoFile.filename),
         description: videoInfos.description,
         duration: videoFile.duration,
-        authorId: author.id,
-        views: videoInfos.views
+        authorId: author.id
       }
 
       const video = db.Video.build(videoData)
@@ -332,11 +478,19 @@ function getVideo (req, res, next) {
 
       // FIXME: make a real view system
       // For example, only add a view when a user watch a video during 30s etc
-      friends.quickAndDirtyUpdateVideoToFriends(videoInstance.id, constants.REQUEST_VIDEO_QADU_TYPES.VIEWS)
+      const qaduParams = {
+        videoId: videoInstance.id,
+        type: constants.REQUEST_VIDEO_QADU_TYPES.VIEWS
+      }
+      friends.quickAndDirtyUpdateVideoToFriends(qaduParams)
     })
   } else {
     // Just send the event to our friends
-    friends.addEventToRemoteVideo(videoInstance.id, constants.REQUEST_VIDEO_EVENT_TYPES.VIEWS)
+    const eventParams = {
+      videoId: videoInstance.id,
+      type: constants.REQUEST_VIDEO_EVENT_TYPES.VIEWS
+    }
+    friends.addEventToRemoteVideo(eventParams)
   }
 
   // Do not wait the view system