server/models/request.js

   1 'use strict'
   2
   3 const each = require('async/each')
   4 const eachLimit = require('async/eachLimit')
   5 const map = require('lodash/map')
   6 const mongoose = require('mongoose')
   7 const waterfall = require('async/waterfall')
   8
   9 const constants = require('../initializers/constants')
  10 const logger = require('../helpers/logger')
  11 const requests = require('../helpers/requests')
  12
  13 const Pod = mongoose.model('Pod')
  14 const Video = mongoose.model('Video')
  15
  16 let timer = null
  17
  18 // ---------------------------------------------------------------------------
  19
  20 const RequestSchema = mongoose.Schema({
  21   request: mongoose.Schema.Types.Mixed,
  22   to: [ { type: mongoose.Schema.Types.ObjectId, ref: 'users' } ]
  23 })
  24
  25 RequestSchema.statics = {
  26   activate,
  27   deactivate,
  28   flush,
  29   forceSend
  30 }
  31
  32 RequestSchema.pre('save', function (next) {
  33   const self = this
  34
  35   if (self.to.length === 0) {
  36     Pod.listAllIds(function (err, podIds) {
  37       if (err) return next(err)
  38
  39       // No friends
  40       if (podIds.length === 0) return
  41
  42       self.to = podIds
  43       return next()
  44     })
  45   } else {
  46     return next()
  47   }
  48 })
  49
  50 mongoose.model('Request', RequestSchema)
  51
  52 // ------------------------------ STATICS ------------------------------
  53
  54 function activate () {
  55   logger.info('Requests scheduler activated.')
  56   timer = setInterval(makeRequests.bind(this), constants.INTERVAL)
  57 }
  58
  59 function deactivate () {
  60   logger.info('Requests scheduler deactivated.')
  61   clearInterval(timer)
  62 }
  63
  64 function flush () {
  65   removeAll.call(this, function (err) {
  66     if (err) logger.error('Cannot flush the requests.', { error: err })
  67   })
  68 }
  69
  70 function forceSend () {
  71   logger.info('Force requests scheduler sending.')
  72   makeRequests.call(this)
  73 }
  74
  75 // ---------------------------------------------------------------------------
  76
  77 // Make a requests to friends of a certain type
  78 function makeRequest (toPod, requestsToMake, callback) {
  79   if (!callback) callback = function () {}
  80
  81   const params = {
  82     toPod: toPod,
  83     encrypt: true, // Security
  84     sign: true, // To prove our identity
  85     method: 'POST',
  86     path: '/api/' + constants.API_VERSION + '/remote/videos',
  87     data: requestsToMake // Requests we need to make
  88   }
  89
  90   // Make multiple retry requests to all of pods
  91   // The function fire some useful callbacks
  92   requests.makeSecureRequest(params, function (err, res) {
  93     if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
  94       logger.error('Error sending secure request to %s pod.', toPod.url, { error: err || new Error('Status code not 20x') })
  95
  96       return callback(false)
  97     }
  98
  99     return callback(true)
 100   })
 101 }
 102
 103 // Make all the requests of the scheduler
 104 function makeRequests () {
 105   const self = this
 106
 107   listWithLimit.call(self, constants.REQUESTS_LIMIT, function (err, requests) {
 108     if (err) {
 109       logger.error('Cannot get the list of requests.', { err: err })
 110       return // Abort
 111     }
 112
 113     // If there are no requests, abort
 114     if (requests.length === 0) {
 115       logger.info('No requests to make.')
 116       return
 117     }
 118
 119     logger.info('Making requests to friends.')
 120
 121     // Requests by pods id
 122     const requestsToMake = {}
 123
 124     requests.forEach(function (poolRequest) {
 125       poolRequest.to.forEach(function (toPodId) {
 126         if (!requestsToMake[toPodId]) {
 127           requestsToMake[toPodId] = {
 128             ids: [],
 129             datas: []
 130           }
 131         }
 132
 133         requestsToMake[toPodId].ids.push(poolRequest._id)
 134         requestsToMake[toPodId].datas.push(poolRequest.request)
 135       })
 136     })
 137
 138     const goodPods = []
 139     const badPods = []
 140
 141     eachLimit(Object.keys(requestsToMake), constants.REQUESTS_IN_PARALLEL, function (toPodId, callbackEach) {
 142       const requestToMake = requestsToMake[toPodId]
 143
 144       // FIXME: mongodb request inside a loop :/
 145       Pod.load(toPodId, function (err, toPod) {
 146         if (err) {
 147           logger.error('Error finding pod by id.', { err: err })
 148           return callbackEach()
 149         }
 150
 151         // Maybe the pod is not our friend anymore so simply remove them
 152         if (!toPod) {
 153           removePodOf.call(self, requestToMake.ids, toPodId)
 154           return callbackEach()
 155         }
 156
 157         makeRequest(toPod, requestToMake.datas, function (success) {
 158           if (err) {
 159             logger.error('Errors when sent request to %s.', toPod.url, { error: err })
 160             // Do not stop the process just for one error
 161             return callbackEach()
 162           }
 163
 164           if (success === true) {
 165             logger.debug('Removing requests for %s pod.', toPodId, { requestsIds: requestToMake.ids })
 166
 167             // Remove the pod id of these request ids
 168             removePodOf.call(self, requestToMake.ids, toPodId)
 169             goodPods.push(toPodId)
 170           } else {
 171             badPods.push(toPodId)
 172           }
 173
 174           callbackEach()
 175         })
 176       })
 177     }, function () {
 178       // All the requests were made, we update the pods score
 179       updatePodsScore(goodPods, badPods)
 180       // Flush requests with no pod
 181       removeWithEmptyTo.call(self)
 182     })
 183   })
 184 }
 185
 186 // Remove pods with a score of 0 (too many requests where they were unreachable)
 187 function removeBadPods () {
 188   waterfall([
 189     function findBadPods (callback) {
 190       Pod.listBadPods(function (err, pods) {
 191         if (err) {
 192           logger.error('Cannot find bad pods.', { error: err })
 193           return callback(err)
 194         }
 195
 196         return callback(null, pods)
 197       })
 198     },
 199
 200     function listVideosOfTheseBadPods (pods, callback) {
 201       if (pods.length === 0) return callback(null)
 202
 203       const urls = map(pods, 'url')
 204
 205       Video.listByUrls(urls, function (err, videosList) {
 206         if (err) {
 207           logger.error('Cannot list videos urls.', { error: err, urls: urls })
 208           return callback(null, pods, [])
 209         }
 210
 211         return callback(null, pods, videosList)
 212       })
 213     },
 214
 215     function removeVideosOfTheseBadPods (pods, videosList, callback) {
 216       // We don't have to remove pods, skip
 217       if (typeof pods === 'function') {
 218         callback = pods
 219         return callback(null)
 220       }
 221
 222       each(videosList, function (video, callbackEach) {
 223         video.remove(callbackEach)
 224       }, function (err) {
 225         if (err) {
 226           // Don't stop the process
 227           logger.error('Error while removing videos of bad pods.', { error: err })
 228           return
 229         }
 230
 231         return callback(null, pods)
 232       })
 233     },
 234
 235     function removeBadPodsFromDB (pods, callback) {
 236       // We don't have to remove pods, skip
 237       if (typeof pods === 'function') {
 238         callback = pods
 239         return callback(null)
 240       }
 241
 242       each(pods, function (pod, callbackEach) {
 243         pod.remove(callbackEach)
 244       }, function (err) {
 245         if (err) return callback(err)
 246
 247         return callback(null, pods.length)
 248       })
 249     }
 250   ], function (err, numberOfPodsRemoved) {
 251     if (err) {
 252       logger.error('Cannot remove bad pods.', { error: err })
 253     } else if (numberOfPodsRemoved) {
 254       logger.info('Removed %d pods.', numberOfPodsRemoved)
 255     } else {
 256       logger.info('No need to remove bad pods.')
 257     }
 258   })
 259 }
 260
 261 function updatePodsScore (goodPods, badPods) {
 262   logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length)
 263
 264   Pod.incrementScores(goodPods, constants.PODS_SCORE.BONUS, function (err) {
 265     if (err) logger.error('Cannot increment scores of good pods.')
 266   })
 267
 268   Pod.incrementScores(badPods, constants.PODS_SCORE.MALUS, function (err) {
 269     if (err) logger.error('Cannot decrement scores of bad pods.')
 270     removeBadPods()
 271   })
 272 }
 273
 274 function listWithLimit (limit, callback) {
 275   this.find({ }, { _id: 1, request: 1, to: 1 }).sort({ _id: 1 }).limit(limit).exec(callback)
 276 }
 277
 278 function removeAll (callback) {
 279   this.remove({ }, callback)
 280 }
 281
 282 function removePodOf (requestsIds, podId, callback) {
 283   if (!callback) callback = function () {}
 284
 285   this.update({ _id: { $in: requestsIds } }, { $pull: { to: podId } }, { multi: true }, callback)
 286 }
 287
 288 function removeWithEmptyTo (callback) {
 289   if (!callback) callback = function () {}
 290
 291   this.remove({ to: { $size: 0 } }, callback)
 292 }