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'use strict'
/*
Request Video for Quick And Dirty Updates like:
- views
- likes
- dislikes
We can't put it in the same system than basic requests for efficiency.
Moreover we don't want to slow down the basic requests with a lot of views/likes/dislikes requests.
So we put it an independant request scheduler.
*/
const values = require('lodash/values')
const constants = require('../initializers/constants')
// ---------------------------------------------------------------------------
module.exports = function (sequelize, DataTypes) {
const RequestVideoQadu = sequelize.define('RequestVideoQadu',
{
type: {
type: DataTypes.ENUM(values(constants.REQUEST_VIDEO_QADU_TYPES)),
allowNull: false
}
},
{
timestamps: false,
indexes: [
{
fields: [ 'podId' ]
},
{
fields: [ 'videoId' ]
}
],
classMethods: {
associate,
listWithLimitAndRandom,
countTotalRequests,
removeAll,
removeByRequestIdsAndPod
}
}
)
return RequestVideoQadu
}
// ------------------------------ STATICS ------------------------------
function associate (models) {
this.belongsTo(models.Pod, {
foreignKey: {
name: 'podId',
allowNull: false
},
onDelete: 'CASCADE'
})
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
Pod.listRandomPodIdsWithRequest(limitPods, 'RequestVideoQadus', 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.Pod,
where: {
id: {
$in: podIds
}
}
},
{
model: self.sequelize.models.Video
}
]
}
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
},
podId
}
}
this.destroy(query).asCallback(callback)
}
function removeAll (callback) {
// Delete all requests
this.truncate({ cascade: true }).asCallback(callback)
}
// ---------------------------------------------------------------------------
function groupAndTruncateRequests (requests, limitRequestsPerPod) {
const requestsGrouped = {}
requests.forEach(function (request) {
const pod = request.Pod
if (!requestsGrouped[pod.id]) requestsGrouped[pod.id] = []
if (requestsGrouped[pod.id].length < limitRequestsPerPod) {
requestsGrouped[pod.id].push({
request: request,
video: request.Video,
pod
})
}
})
return requestsGrouped
}
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