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: 'Pod' } ]
  23 })
  24
  25 RequestSchema.statics = {
  26   activate,
  27   deactivate,
  28   flush,
  29   forceSend,
  30   list
  31 }
  32
  33 RequestSchema.pre('save', function (next) {
  34   const self = this
  35
  36   if (self.to.length === 0) {
  37     Pod.listAllIds(function (err, podIds) {
  38       if (err) return next(err)
  39
  40       // No friends
  41       if (podIds.length === 0) return
  42
  43       self.to = podIds
  44       return next()
  45     })
  46   } else {
  47     return next()
  48   }
  49 })
  50
  51 mongoose.model('Request', RequestSchema)
  52
  53 // ------------------------------ STATICS ------------------------------
  54
  55 function activate () {
  56   logger.info('Requests scheduler activated.')
  57   timer = setInterval(makeRequests.bind(this), constants.REQUESTS_INTERVAL)
  58 }
  59
  60 function deactivate () {
  61   logger.info('Requests scheduler deactivated.')
  62   clearInterval(timer)
  63 }
  64
  65 function flush () {
  66   removeAll.call(this, function (err) {
  67     if (err) logger.error('Cannot flush the requests.', { error: err })
  68   })
  69 }
  70
  71 function forceSend () {
  72   logger.info('Force requests scheduler sending.')
  73   makeRequests.call(this)
  74 }
  75
  76 function list (callback) {
  77   this.find({ }, callback)
  78 }
  79
  80 // ---------------------------------------------------------------------------
  81
  82 // Make a requests to friends of a certain type
  83 function makeRequest (toPod, requestsToMake, callback) {
  84   if (!callback) callback = function () {}
  85
  86   const params = {
  87     toPod: toPod,
  88     encrypt: true, // Security
  89     sign: true, // To prove our identity
  90     method: 'POST',
  91     path: '/api/' + constants.API_VERSION + '/remote/videos',
  92     data: requestsToMake // Requests we need to make
  93   }
  94
  95   // Make multiple retry requests to all of pods
  96   // The function fire some useful callbacks
  97   requests.makeSecureRequest(params, function (err, res) {
  98     if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
  99       logger.error(
 100         'Error sending secure request to %s pod.',
 101         toPod.url,
 102         {
 103           error: err || new Error('Status code not 20x'),
 104           statusCode: res.statusCode
 105         }
 106       )
 107
 108       return callback(false)
 109     }
 110
 111     return callback(true)
 112   })
 113 }
 114
 115 // Make all the requests of the scheduler
 116 function makeRequests () {
 117   const self = this
 118
 119   listWithLimit.call(self, constants.REQUESTS_LIMIT, function (err, requests) {
 120     if (err) {
 121       logger.error('Cannot get the list of requests.', { err: err })
 122       return // Abort
 123     }
 124
 125     // If there are no requests, abort
 126     if (requests.length === 0) {
 127       logger.info('No requests to make.')
 128       return
 129     }
 130
 131     logger.info('Making requests to friends.')
 132
 133     // Requests by pods id
 134     const requestsToMake = {}
 135
 136     requests.forEach(function (poolRequest) {
 137       poolRequest.to.forEach(function (toPodId) {
 138         if (!requestsToMake[toPodId]) {
 139           requestsToMake[toPodId] = {
 140             ids: [],
 141             datas: []
 142           }
 143         }
 144
 145         requestsToMake[toPodId].ids.push(poolRequest._id)
 146         requestsToMake[toPodId].datas.push(poolRequest.request)
 147       })
 148     })
 149
 150     const goodPods = []
 151     const badPods = []
 152
 153     eachLimit(Object.keys(requestsToMake), constants.REQUESTS_IN_PARALLEL, function (toPodId, callbackEach) {
 154       const requestToMake = requestsToMake[toPodId]
 155
 156       // FIXME: mongodb request inside a loop :/
 157       Pod.load(toPodId, function (err, toPod) {
 158         if (err) {
 159           logger.error('Error finding pod by id.', { err: err })
 160           return callbackEach()
 161         }
 162
 163         // Maybe the pod is not our friend anymore so simply remove them
 164         if (!toPod) {
 165           removePodOf.call(self, requestToMake.ids, toPodId)
 166           return callbackEach()
 167         }
 168
 169         makeRequest(toPod, requestToMake.datas, function (success) {
 170           if (success === true) {
 171             logger.debug('Removing requests for %s pod.', toPodId, { requestsIds: requestToMake.ids })
 172
 173             // Remove the pod id of these request ids
 174             removePodOf.call(self, requestToMake.ids, toPodId)
 175             goodPods.push(toPodId)
 176           } else {
 177             badPods.push(toPodId)
 178           }
 179
 180           callbackEach()
 181         })
 182       })
 183     }, function () {
 184       // All the requests were made, we update the pods score
 185       updatePodsScore(goodPods, badPods)
 186       // Flush requests with no pod
 187       removeWithEmptyTo.call(self)
 188     })
 189   })
 190 }
 191
 192 // Remove pods with a score of 0 (too many requests where they were unreachable)
 193 function removeBadPods () {
 194   waterfall([
 195     function findBadPods (callback) {
 196       Pod.listBadPods(function (err, pods) {
 197         if (err) {
 198           logger.error('Cannot find bad pods.', { error: err })
 199           return callback(err)
 200         }
 201
 202         return callback(null, pods)
 203       })
 204     },
 205
 206     function listVideosOfTheseBadPods (pods, callback) {
 207       if (pods.length === 0) return callback(null)
 208
 209       const urls = map(pods, 'url')
 210
 211       Video.listByUrls(urls, function (err, videosList) {
 212         if (err) {
 213           logger.error('Cannot list videos urls.', { error: err, urls: urls })
 214           return callback(null, pods, [])
 215         }
 216
 217         return callback(null, pods, videosList)
 218       })
 219     },
 220
 221     function removeVideosOfTheseBadPods (pods, videosList, callback) {
 222       // We don't have to remove pods, skip
 223       if (typeof pods === 'function') {
 224         callback = pods
 225         return callback(null)
 226       }
 227
 228       each(videosList, function (video, callbackEach) {
 229         video.remove(callbackEach)
 230       }, function (err) {
 231         if (err) {
 232           // Don't stop the process
 233           logger.error('Error while removing videos of bad pods.', { error: err })
 234           return
 235         }
 236
 237         return callback(null, pods)
 238       })
 239     },
 240
 241     function removeBadPodsFromDB (pods, callback) {
 242       // We don't have to remove pods, skip
 243       if (typeof pods === 'function') {
 244         callback = pods
 245         return callback(null)
 246       }
 247
 248       each(pods, function (pod, callbackEach) {
 249         pod.remove(callbackEach)
 250       }, function (err) {
 251         if (err) return callback(err)
 252
 253         return callback(null, pods.length)
 254       })
 255     }
 256   ], function (err, numberOfPodsRemoved) {
 257     if (err) {
 258       logger.error('Cannot remove bad pods.', { error: err })
 259     } else if (numberOfPodsRemoved) {
 260       logger.info('Removed %d pods.', numberOfPodsRemoved)
 261     } else {
 262       logger.info('No need to remove bad pods.')
 263     }
 264   })
 265 }
 266
 267 function updatePodsScore (goodPods, badPods) {
 268   logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length)
 269
 270   Pod.incrementScores(goodPods, constants.PODS_SCORE.BONUS, function (err) {
 271     if (err) logger.error('Cannot increment scores of good pods.')
 272   })
 273
 274   Pod.incrementScores(badPods, constants.PODS_SCORE.MALUS, function (err) {
 275     if (err) logger.error('Cannot decrement scores of bad pods.')
 276     removeBadPods()
 277   })
 278 }
 279
 280 function listWithLimit (limit, callback) {
 281   this.find({ }, { _id: 1, request: 1, to: 1 }).sort({ _id: 1 }).limit(limit).exec(callback)
 282 }
 283
 284 function removeAll (callback) {
 285   this.remove({ }, callback)
 286 }
 287
 288 function removePodOf (requestsIds, podId, callback) {
 289   if (!callback) callback = function () {}
 290
 291   this.update({ _id: { $in: requestsIds } }, { $pull: { to: podId } }, { multi: true }, callback)
 292 }
 293
 294 function removeWithEmptyTo (callback) {
 295   if (!callback) callback = function () {}
 296
 297   this.remove({ to: { $size: 0 } }, callback)
 298 }