1 files changed, 228 insertions, 0 deletions

diff --git a/server/lib/friends.js b/server/lib/friends.js
new file mode 100644
index 000000000..006a64404
--- /dev/null
+++ b/server/lib/friends.js
@@ -0,0 +1,228 @@
+'use strict'
+
+var async = require('async')
+var config = require('config')
+var fs = require('fs')
+var request = require('request')
+
+var constants = require('../initializers/constants')
+var logger = require('../helpers/logger')
+var peertubeCrypto = require('../helpers/peertubeCrypto')
+var Pods = require('../models/pods')
+var poolRequests = require('../lib/poolRequests')
+var requests = require('../helpers/requests')
+var Videos = require('../models/videos')
+
+var http = config.get('webserver.https') ? 'https' : 'http'
+var host = config.get('webserver.host')
+var port = config.get('webserver.port')
+
+var pods = {
+  addVideoToFriends: addVideoToFriends,
+  hasFriends: hasFriends,
+  makeFriends: makeFriends,
+  quitFriends: quitFriends,
+  removeVideoToFriends: removeVideoToFriends
+}
+
+function addVideoToFriends (video) {
+  // To avoid duplicates
+  var id = video.name + video.magnetUri
+  // ensure namePath is null
+  video.namePath = null
+  poolRequests.addRequest(id, 'add', video)
+}
+
+function hasFriends (callback) {
+  Pods.count(function (err, count) {
+    if (err) return callback(err)
+
+    var has_friends = (count !== 0)
+    callback(null, has_friends)
+  })
+}
+
+function makeFriends (callback) {
+  var pods_score = {}
+
+  logger.info('Make friends!')
+  fs.readFile(peertubeCrypto.getCertDir() + 'peertube.pub', 'utf8', function (err, cert) {
+    if (err) {
+      logger.error('Cannot read public cert.')
+      return callback(err)
+    }
+
+    var urls = config.get('network.friends')
+
+    async.each(urls, function (url, callback) {
+      computeForeignPodsList(url, pods_score, callback)
+    }, function (err) {
+      if (err) return callback(err)
+
+      logger.debug('Pods scores computed.', { pods_score: pods_score })
+      var pods_list = computeWinningPods(urls, pods_score)
+      logger.debug('Pods that we keep computed.', { pods_to_keep: pods_list })
+
+      makeRequestsToWinningPods(cert, pods_list, callback)
+    })
+  })
+}
+
+function quitFriends (callback) {
+  // Stop pool requests
+  poolRequests.deactivate()
+  // Flush pool requests
+  poolRequests.forceSend()
+
+  Pods.list(function (err, pods) {
+    if (err) return callback(err)
+
+    var request = {
+      method: 'POST',
+      path: '/api/' + constants.API_VERSION + '/pods/remove',
+      sign: true,
+      encrypt: true,
+      data: {
+        url: 'me' // Fake data
+      }
+    }
+
+    // Announce we quit them
+    requests.makeMultipleRetryRequest(request, pods, function () {
+      Pods.removeAll(function (err) {
+        poolRequests.activate()
+
+        if (err) return callback(err)
+
+        logger.info('Broke friends, so sad :(')
+
+        Videos.removeAllRemotes(function (err) {
+          if (err) return callback(err)
+
+          logger.info('Removed all remote videos.')
+          callback(null)
+        })
+      })
+    })
+  })
+}
+
+function removeVideoToFriends (video) {
+  // To avoid duplicates
+  var id = video.name + video.magnetUri
+  poolRequests.addRequest(id, 'remove', video)
+}
+
+// ---------------------------------------------------------------------------
+
+module.exports = pods
+
+// ---------------------------------------------------------------------------
+
+function computeForeignPodsList (url, pods_score, callback) {
+  // Let's give 1 point to the pod we ask the friends list
+  pods_score[url] = 1
+
+  getForeignPodsList(url, function (err, foreign_pods_list) {
+    if (err) return callback(err)
+    if (foreign_pods_list.length === 0) return callback()
+
+    async.each(foreign_pods_list, function (foreign_pod, callback_each) {
+      var foreign_url = foreign_pod.url
+
+      if (pods_score[foreign_url]) pods_score[foreign_url]++
+      else pods_score[foreign_url] = 1
+
+      callback_each()
+    }, function () {
+      callback()
+    })
+  })
+}
+
+function computeWinningPods (urls, pods_score) {
+  // Build the list of pods to add
+  // Only add a pod if it exists in more than a half base pods
+  var pods_list = []
+  var base_score = urls.length / 2
+  Object.keys(pods_score).forEach(function (pod) {
+    if (pods_score[pod] > base_score) pods_list.push({ url: pod })
+  })
+
+  return pods_list
+}
+
+function getForeignPodsList (url, callback) {
+  var path = '/api/' + constants.API_VERSION + '/pods'
+
+  request.get(url + path, function (err, response, body) {
+    if (err) return callback(err)
+
+    callback(null, JSON.parse(body))
+  })
+}
+
+function makeRequestsToWinningPods (cert, pods_list, callback) {
+  // Stop pool requests
+  poolRequests.deactivate()
+  // Flush pool requests
+  poolRequests.forceSend()
+
+  // Get the list of our videos to send to our new friends
+  Videos.listOwned(function (err, videos_list) {
+    if (err) {
+      logger.error('Cannot get the list of videos we own.')
+      return callback(err)
+    }
+
+    var data = {
+      url: http + '://' + host + ':' + port,
+      publicKey: cert,
+      videos: videos_list
+    }
+
+    requests.makeMultipleRetryRequest(
+      { method: 'POST', path: '/api/' + constants.API_VERSION + '/pods/', data: data },
+
+      pods_list,
+
+      function eachRequest (err, response, body, url, pod, callback_each_request) {
+        // We add the pod if it responded correctly with its public certificate
+        if (!err && response.statusCode === 200) {
+          Pods.add({ url: pod.url, publicKey: body.cert, score: constants.FRIEND_BASE_SCORE }, function (err) {
+            if (err) {
+              logger.error('Error with adding %s pod.', pod.url, { error: err })
+              return callback_each_request()
+            }
+
+            Videos.addRemotes(body.videos, function (err) {
+              if (err) {
+                logger.error('Error with adding videos of pod.', pod.url, { error: err })
+                return callback_each_request()
+              }
+
+              logger.debug('Adding remote videos from %s.', pod.url, { videos: body.videos })
+              return callback_each_request()
+            })
+          })
+        } else {
+          logger.error('Error with adding %s pod.', pod.url, { error: err || new Error('Status not 200') })
+          return callback_each_request()
+        }
+      },
+
+      function endRequests (err) {
+        // Now we made new friends, we can re activate the pool of requests
+        poolRequests.activate()
+
+        if (err) {
+          logger.error('There was some errors when we wanted to make friends.')
+          return callback(err)
+        }
+
+        logger.debug('makeRequestsToWinningPods finished.')
+        return callback(null)
+      }
+    )
+  })
+}