Server: implement video views

1 files changed, 169 insertions, 0 deletions

diff --git a/server/models/request-video-event.js b/server/models/request-video-event.js
new file mode 100644
index 000000000..ef3ebcb3a
--- /dev/null
+++ b/server/models/request-video-event.js
@@ -0,0 +1,169 @@
+'use strict'
+
+/*
+  Request Video events (likes, dislikes, views...)
+*/
+
+const values = require('lodash/values')
+
+const constants = require('../initializers/constants')
+const customVideosValidators = require('../helpers/custom-validators').videos
+
+// ---------------------------------------------------------------------------
+
+module.exports = function (sequelize, DataTypes) {
+  const RequestVideoEvent = sequelize.define('RequestVideoEvent',
+    {
+      type: {
+        type: DataTypes.ENUM(values(constants.REQUEST_VIDEO_EVENT_TYPES)),
+        allowNull: false
+      },
+      count: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+        validate: {
+          countValid: function (value) {
+            const res = customVideosValidators.isVideoEventCountValid(value)
+            if (res === false) throw new Error('Video event count is not valid.')
+          }
+        }
+      }
+    },
+    {
+      updatedAt: false,
+      indexes: [
+        {
+          fields: [ 'videoId' ]
+        }
+      ],
+      classMethods: {
+        associate,
+
+        listWithLimitAndRandom,
+
+        countTotalRequests,
+        removeAll,
+        removeByRequestIdsAndPod
+      }
+    }
+  )
+
+  return RequestVideoEvent
+}
+
+// ------------------------------ STATICS ------------------------------
+
+function associate (models) {
+  this.belongsTo(models.Video, {
+    foreignKey: {
+      name: 'videoId',
+      allowNull: false
+    },
+    onDelete: 'CASCADE'
+  })
+}
+
+function countTotalRequests (callback) {
+  const query = {}
+  return this.count(query).asCallback(callback)
+}
+
+function listWithLimitAndRandom (limitPods, limitRequestsPerPod, callback) {
+  const self = this
+  const Pod = this.sequelize.models.Pod
+
+  // We make a join between videos and authors to find the podId of our video event requests
+  const podJoins = 'INNER JOIN "Videos" ON "Videos"."authorId" = "Authors"."id" ' +
+                   'INNER JOIN "RequestVideoEvents" ON "RequestVideoEvents"."videoId" = "Videos"."id"'
+
+  Pod.listRandomPodIdsWithRequest(limitPods, 'Authors', podJoins, function (err, podIds) {
+    if (err) return callback(err)
+
+    // We don't have friends that have requests
+    if (podIds.length === 0) return callback(null, [])
+
+    const query = {
+      include: [
+        {
+          model: self.sequelize.models.Video,
+          include: [
+            {
+              model: self.sequelize.models.Author,
+              include: [
+                {
+                  model: self.sequelize.models.Pod,
+                  where: {
+                    id: {
+                      $in: podIds
+                    }
+                  }
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    }
+
+    self.findAll(query).asCallback(function (err, requests) {
+      if (err) return callback(err)
+
+      const requestsGrouped = groupAndTruncateRequests(requests, limitRequestsPerPod)
+      return callback(err, requestsGrouped)
+    })
+  })
+}
+
+function removeByRequestIdsAndPod (ids, podId, callback) {
+  const query = {
+    where: {
+      id: {
+        $in: ids
+      }
+    },
+    include: [
+      {
+        model: this.sequelize.models.Video,
+        include: [
+          {
+            model: this.sequelize.models.Author,
+            where: {
+              podId
+            }
+          }
+        ]
+      }
+    ]
+  }
+
+  this.destroy(query).asCallback(callback)
+}
+
+function removeAll (callback) {
+  // Delete all requests
+  this.truncate({ cascade: true }).asCallback(callback)
+}
+
+// ---------------------------------------------------------------------------
+
+function groupAndTruncateRequests (events, limitRequestsPerPod) {
+  const eventsGrouped = {}
+
+  events.forEach(function (event) {
+    const pod = event.Video.Author.Pod
+
+    if (!eventsGrouped[pod.id]) eventsGrouped[pod.id] = []
+
+    if (eventsGrouped[pod.id].length < limitRequestsPerPod) {
+      eventsGrouped[pod.id].push({
+        id: event.id,
+        type: event.type,
+        count: event.count,
+        video: event.Video,
+        pod
+      })
+    }
+  })
+
+  return eventsGrouped
+}