aboutsummaryrefslogtreecommitdiffhomepage
path: root/server/lib/friends.js
blob: 3ed29f651fad10625b82bea98cd3220fa4da1acf (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
'use strict'

const each = require('async/each')
const eachLimit = require('async/eachLimit')
const eachSeries = require('async/eachSeries')
const fs = require('fs')
const request = require('request')
const waterfall = require('async/waterfall')

const constants = require('../initializers/constants')
const db = require('../initializers/database')
const logger = require('../helpers/logger')
const requests = require('../helpers/requests')

const friends = {
  addVideoToFriends,
  hasFriends,
  getMyCertificate,
  makeFriends,
  quitFriends,
  removeVideoToFriends,
  sendOwnedVideosToPod
}

function addVideoToFriends (video) {
  createRequest('add', constants.REQUEST_ENDPOINTS.VIDEOS, video)
}

function hasFriends (callback) {
  db.Pod.countAll(function (err, count) {
    if (err) return callback(err)

    const hasFriends = (count !== 0)
    callback(null, hasFriends)
  })
}

function getMyCertificate (callback) {
  fs.readFile(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.pub', 'utf8', callback)
}

function makeFriends (hosts, callback) {
  const podsScore = {}

  logger.info('Make friends!')
  getMyCertificate(function (err, cert) {
    if (err) {
      logger.error('Cannot read public cert.')
      return callback(err)
    }

    eachSeries(hosts, function (host, callbackEach) {
      computeForeignPodsList(host, podsScore, callbackEach)
    }, function (err) {
      if (err) return callback(err)

      logger.debug('Pods scores computed.', { podsScore: podsScore })
      const podsList = computeWinningPods(hosts, podsScore)
      logger.debug('Pods that we keep.', { podsToKeep: podsList })

      makeRequestsToWinningPods(cert, podsList, callback)
    })
  })
}

function quitFriends (callback) {
  // Stop pool requests
  db.Request.deactivate()
  // Flush pool requests
  db.Request.flush()

  waterfall([
    function getPodsList (callbackAsync) {
      return db.Pod.list(callbackAsync)
    },

    function announceIQuitMyFriends (pods, callbackAsync) {
      const requestParams = {
        method: 'POST',
        path: '/api/' + constants.API_VERSION + '/pods/remove',
        sign: true
      }

      // Announce we quit them
      // We don't care if the request fails
      // The other pod will exclude us automatically after a while
      eachLimit(pods, constants.REQUESTS_IN_PARALLEL, function (pod, callbackEach) {
        requestParams.toPod = pod
        requests.makeSecureRequest(requestParams, callbackEach)
      }, function (err) {
        if (err) {
          logger.error('Some errors while quitting friends.', { err: err })
          // Don't stop the process
        }

        return callbackAsync(null, pods)
      })
    },

    function removePodsFromDB (pods, callbackAsync) {
      each(pods, function (pod, callbackEach) {
        pod.destroy().asCallback(callbackEach)
      }, callbackAsync)
    }
  ], function (err) {
    // Don't forget to re activate the scheduler, even if there was an error
    db.Request.activate()

    if (err) return callback(err)

    logger.info('Removed all remote videos.')
    return callback(null)
  })
}

function removeVideoToFriends (videoParams) {
  createRequest('remove', constants.REQUEST_ENDPOINTS.VIDEOS, videoParams)
}

function sendOwnedVideosToPod (podId) {
  db.Video.listOwnedAndPopulateAuthor(function (err, videosList) {
    if (err) {
      logger.error('Cannot get the list of videos we own.')
      return
    }

    videosList.forEach(function (video) {
      video.toRemoteJSON(function (err, remoteVideo) {
        if (err) {
          logger.error('Cannot convert video to remote.', { error: err })
          // Don't break the process
          return
        }

        createRequest('add', constants.REQUEST_ENDPOINTS.VIDEOS, remoteVideo, [ podId ])
      })
    })
  })
}

// ---------------------------------------------------------------------------

module.exports = friends

// ---------------------------------------------------------------------------

function computeForeignPodsList (host, podsScore, callback) {
  getForeignPodsList(host, function (err, foreignPodsList) {
    if (err) return callback(err)

    if (!foreignPodsList) foreignPodsList = []

    // Let's give 1 point to the pod we ask the friends list
    foreignPodsList.push({ host })

    foreignPodsList.forEach(function (foreignPod) {
      const foreignPodHost = foreignPod.host

      if (podsScore[foreignPodHost]) podsScore[foreignPodHost]++
      else podsScore[foreignPodHost] = 1
    })

    callback()
  })
}

function computeWinningPods (hosts, podsScore) {
  // Build the list of pods to add
  // Only add a pod if it exists in more than a half base pods
  const podsList = []
  const baseScore = hosts.length / 2
  Object.keys(podsScore).forEach(function (podHost) {
    // If the pod is not me and with a good score we add it
    if (isMe(podHost) === false && podsScore[podHost] > baseScore) {
      podsList.push({ host: podHost })
    }
  })

  return podsList
}

function getForeignPodsList (host, callback) {
  const path = '/api/' + constants.API_VERSION + '/pods'

  request.get(constants.REMOTE_SCHEME.HTTP + '://' + host + path, function (err, response, body) {
    if (err) return callback(err)

    try {
      const json = JSON.parse(body)
      return callback(null, json)
    } catch (err) {
      return callback(err)
    }
  })
}

function makeRequestsToWinningPods (cert, podsList, callback) {
  // Stop pool requests
  db.Request.deactivate()
  // Flush pool requests
  db.Request.forceSend()

  eachLimit(podsList, constants.REQUESTS_IN_PARALLEL, function (pod, callbackEach) {
    const params = {
      url: constants.REMOTE_SCHEME.HTTP + '://' + pod.host + '/api/' + constants.API_VERSION + '/pods/',
      method: 'POST',
      json: {
        host: constants.CONFIG.WEBSERVER.HOST,
        publicKey: cert
      }
    }

    requests.makeRetryRequest(params, function (err, res, body) {
      if (err) {
        logger.error('Error with adding %s pod.', pod.host, { error: err })
        // Don't break the process
        return callbackEach()
      }

      if (res.statusCode === 200) {
        const podObj = db.Pod.build({ host: pod.host, publicKey: body.cert })
        podObj.save().asCallback(function (err, podCreated) {
          if (err) {
            logger.error('Cannot add friend %s pod.', pod.host, { error: err })
            return callbackEach()
          }

          // Add our videos to the request scheduler
          sendOwnedVideosToPod(podCreated._id)

          return callbackEach()
        })
      } else {
        logger.error('Status not 200 for %s pod.', pod.host)
        return callbackEach()
      }
    })
  }, function endRequests () {
    // Final callback, we've ended all the requests
    // Now we made new friends, we can re activate the pool of requests
    db.Request.activate()

    logger.debug('makeRequestsToWinningPods finished.')
    return callback()
  })
}

// Wrapper that populate "to" argument with all our friends if it is not specified
function createRequest (type, endpoint, data, to) {
  if (to) return _createRequest(type, endpoint, data, to)

  // If the "to" pods is not specified, we send the request to all our friends
  db.Pod.listAllIds(function (err, podIds) {
    if (err) {
      logger.error('Cannot get pod ids', { error: err })
      return
    }

    return _createRequest(type, endpoint, data, podIds)
  })
}

function _createRequest (type, endpoint, data, to) {
  const pods = []

  // If there are no destination pods abort
  if (to.length === 0) return

  to.forEach(function (toPod) {
    pods.push(db.Pod.build({ id: toPod }))
  })

  const createQuery = {
    endpoint,
    request: {
      type: type,
      data: data
    }
  }

  // We run in transaction to keep coherency between Request and RequestToPod tables
  db.sequelize.transaction(function (t) {
    const dbRequestOptions = {
      transaction: t
    }

    return db.Request.create(createQuery, dbRequestOptions).then(function (request) {
      return request.setPods(pods, dbRequestOptions)
    })
  }).asCallback(function (err) {
    if (err) logger.error('Error in createRequest transaction.', { error: err })
  })
}

function isMe (host) {
  return host === constants.CONFIG.WEBSERVER.HOST
}