server/lib/friends.js

   1 'use strict'
   2
   3 const each = require('async/each')
   4 const eachLimit = require('async/eachLimit')
   5 const eachSeries = require('async/eachSeries')
   6 const fs = require('fs')
   7 const mongoose = require('mongoose')
   8 const request = require('request')
   9 const waterfall = require('async/waterfall')
  10
  11 const constants = require('../initializers/constants')
  12 const logger = require('../helpers/logger')
  13 const requests = require('../helpers/requests')
  14
  15 const Pod = mongoose.model('Pod')
  16 const Request = mongoose.model('Request')
  17 const Video = mongoose.model('Video')
  18
  19 const friends = {
  20   addVideoToFriends,
  21   hasFriends,
  22   getMyCertificate,
  23   makeFriends,
  24   quitFriends,
  25   removeVideoToFriends,
  26   sendOwnedVideosToPod
  27 }
  28
  29 function addVideoToFriends (video) {
  30   createRequest('add', video)
  31 }
  32
  33 function hasFriends (callback) {
  34   Pod.countAll(function (err, count) {
  35     if (err) return callback(err)
  36
  37     const hasFriends = (count !== 0)
  38     callback(null, hasFriends)
  39   })
  40 }
  41
  42 function getMyCertificate (callback) {
  43   fs.readFile(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.pub', 'utf8', callback)
  44 }
  45
  46 function makeFriends (urls, callback) {
  47   const podsScore = {}
  48
  49   logger.info('Make friends!')
  50   getMyCertificate(function (err, cert) {
  51     if (err) {
  52       logger.error('Cannot read public cert.')
  53       return callback(err)
  54     }
  55
  56     eachSeries(urls, function (url, callbackEach) {
  57       computeForeignPodsList(url, podsScore, callbackEach)
  58     }, function (err) {
  59       if (err) return callback(err)
  60
  61       logger.debug('Pods scores computed.', { podsScore: podsScore })
  62       const podsList = computeWinningPods(urls, podsScore)
  63       logger.debug('Pods that we keep.', { podsToKeep: podsList })
  64
  65       makeRequestsToWinningPods(cert, podsList, callback)
  66     })
  67   })
  68 }
  69
  70 function quitFriends (callback) {
  71   // Stop pool requests
  72   Request.deactivate()
  73   // Flush pool requests
  74   Request.flush()
  75
  76   waterfall([
  77     function getPodsList (callbackAsync) {
  78       return Pod.list(callbackAsync)
  79     },
  80
  81     function announceIQuitMyFriends (pods, callbackAsync) {
  82       const requestParams = {
  83         method: 'POST',
  84         path: '/api/' + constants.API_VERSION + '/pods/remove',
  85         sign: true
  86       }
  87
  88       // Announce we quit them
  89       // We don't care if the request fails
  90       // The other pod will exclude us automatically after a while
  91       eachLimit(pods, constants.REQUESTS_IN_PARALLEL, function (pod, callbackEach) {
  92         requestParams.toPod = pod
  93         requests.makeSecureRequest(requestParams, callbackEach)
  94       }, function (err) {
  95         if (err) {
  96           logger.error('Some errors while quitting friends.', { err: err })
  97           // Don't stop the process
  98         }
  99
 100         return callbackAsync(null, pods)
 101       })
 102     },
 103
 104     function removePodsFromDB (pods, callbackAsync) {
 105       each(pods, function (pod, callbackEach) {
 106         pod.remove(callbackEach)
 107       }, callbackAsync)
 108     }
 109   ], function (err) {
 110     // Don't forget to re activate the scheduler, even if there was an error
 111     Request.activate()
 112
 113     if (err) return callback(err)
 114
 115     logger.info('Removed all remote videos.')
 116     return callback(null)
 117   })
 118 }
 119
 120 function removeVideoToFriends (videoParams) {
 121   createRequest('remove', videoParams)
 122 }
 123
 124 function sendOwnedVideosToPod (podId) {
 125   Video.listOwned(function (err, videosList) {
 126     if (err) {
 127       logger.error('Cannot get the list of videos we own.')
 128       return
 129     }
 130
 131     videosList.forEach(function (video) {
 132       video.toRemoteJSON(function (err, remoteVideo) {
 133         if (err) {
 134           logger.error('Cannot convert video to remote.', { error: err })
 135           // Don't break the process
 136           return
 137         }
 138
 139         createRequest('add', remoteVideo, [ podId ])
 140       })
 141     })
 142   })
 143 }
 144
 145 // ---------------------------------------------------------------------------
 146
 147 module.exports = friends
 148
 149 // ---------------------------------------------------------------------------
 150
 151 function computeForeignPodsList (url, podsScore, callback) {
 152   getForeignPodsList(url, function (err, foreignPodsList) {
 153     if (err) return callback(err)
 154
 155     if (!foreignPodsList) foreignPodsList = []
 156
 157     // Let's give 1 point to the pod we ask the friends list
 158     foreignPodsList.push({ url: url })
 159
 160     foreignPodsList.forEach(function (foreignPod) {
 161       const foreignPodUrl = foreignPod.url
 162
 163       if (podsScore[foreignPodUrl]) podsScore[foreignPodUrl]++
 164       else podsScore[foreignPodUrl] = 1
 165     })
 166
 167     callback()
 168   })
 169 }
 170
 171 function computeWinningPods (urls, podsScore) {
 172   // Build the list of pods to add
 173   // Only add a pod if it exists in more than a half base pods
 174   const podsList = []
 175   const baseScore = urls.length / 2
 176   Object.keys(podsScore).forEach(function (pod) {
 177     if (podsScore[pod] > baseScore) podsList.push({ url: pod })
 178   })
 179
 180   return podsList
 181 }
 182
 183 function getForeignPodsList (url, callback) {
 184   const path = '/api/' + constants.API_VERSION + '/pods'
 185
 186   request.get(url + path, function (err, response, body) {
 187     if (err) return callback(err)
 188
 189     try {
 190       const json = JSON.parse(body)
 191       return callback(null, json)
 192     } catch (err) {
 193       return callback(err)
 194     }
 195   })
 196 }
 197
 198 function makeRequestsToWinningPods (cert, podsList, callback) {
 199   // Stop pool requests
 200   Request.deactivate()
 201   // Flush pool requests
 202   Request.forceSend()
 203
 204   eachLimit(podsList, constants.REQUESTS_IN_PARALLEL, function (pod, callbackEach) {
 205     const params = {
 206       url: pod.url + '/api/' + constants.API_VERSION + '/pods/',
 207       method: 'POST',
 208       json: {
 209         url: constants.CONFIG.WEBSERVER.URL,
 210         publicKey: cert
 211       }
 212     }
 213
 214     requests.makeRetryRequest(params, function (err, res, body) {
 215       if (err) {
 216         logger.error('Error with adding %s pod.', pod.url, { error: err })
 217         // Don't break the process
 218         return callbackEach()
 219       }
 220
 221       if (res.statusCode === 200) {
 222         const podObj = new Pod({ url: pod.url, publicKey: body.cert })
 223         podObj.save(function (err, podCreated) {
 224           if (err) {
 225             logger.error('Cannot add friend %s pod.', pod.url, { error: err })
 226             return callbackEach()
 227           }
 228
 229           // Add our videos to the request scheduler
 230           sendOwnedVideosToPod(podCreated._id)
 231
 232           return callbackEach()
 233         })
 234       } else {
 235         logger.error('Status not 200 for %s pod.', pod.url)
 236         return callbackEach()
 237       }
 238     })
 239   }, function endRequests () {
 240     // Final callback, we've ended all the requests
 241     // Now we made new friends, we can re activate the pool of requests
 242     Request.activate()
 243
 244     logger.debug('makeRequestsToWinningPods finished.')
 245     return callback()
 246   })
 247 }
 248
 249 function createRequest (type, data, to) {
 250   const req = new Request({
 251     request: {
 252       type: type,
 253       data: data
 254     }
 255   })
 256
 257   if (to) {
 258     req.to = to
 259   }
 260
 261   req.save(function (err) {
 262     if (err) logger.error('Cannot save the request.', { error: err })
 263   })
 264 }