PeerTube/src/pods.js

;(function () {
  'use strict'

  var fs = require('fs')
  var config = require('config')
  var async = require('async')
  var request = require('request')

  var logger = require('./logger')
  var utils = require('./utils')
  var PodsDB = require('./database').PodsDB

  var pods = {}
  var http = config.get('webserver.https') ? 'https' : 'http'
  var host = config.get('webserver.host')
  var port = config.get('webserver.port')

  // ----------- Private functions -----------

  function getForeignPodsList (url, callback) {
    var path = '/api/pods'

    request.get(url + path, function (err, response, body) {
      if (err) throw err
      callback(JSON.parse(body))
    })
  }

  // ----------- Public functions -----------
  pods.list = function (callback) {
    PodsDB.find(function (err, pods_list) {
      if (err) {
        logger.error('Cannot get the list of the pods.', { error: err })
        return callback(err)
      }

      return callback(null, pods_list)
    })
  }

  // { url }
  pods.add = function (data, callback) {
    logger.info('Adding pod: %s', data.url)

    var params = {
      url: data.url,
      publicKey: data.publicKey
    }

    PodsDB.create(params, function (err, pod) {
      if (err) {
        logger.error('Cannot insert the pod.', { error: err })
        return callback(err)
      }

      fs.readFile(utils.certDir + 'peertube.pub', 'utf8', function (err, cert) {
        if (err) {
          logger.error('Cannot read cert file.', { error: err })
          return callback(err)
        }

        return callback(null, { cert: cert })
      })
    })
  }

  // { path, data }
  pods.makeSecureRequest = function (data, callback) {
    PodsDB.find({}, { url: 1, publicKey: 1 }).exec(function (err, urls) {
      if (err) {
        logger.error('Cannot get the list of the pods.', { error: err })
        return callback(err)
      }

      logger.debug('Make multiple requests.')
      utils.makeMultipleRetryRequest(
        { encrypt: true, sign: true, method: data.method, path: data.path, data: data.data },

        urls,

        function (err, response, body, url) {
          if (err || response.statusCode !== 200) {
            logger.error('Error sending secure request to %s/%s pod.', url, data.path, { error: err })
          }
        },

        function (err) {
          if (err) {
            logger.error('There was some errors when sending the video meta data.', { error: err })
            return callback(err)
          }

          logger.debug('Finished')
          callback(null)
        }
      )
    })
  }

  pods.makeFriends = function (callback) {
    logger.debug('Read public key...')
    fs.readFile(utils.certDir + 'peertube.pub', 'utf8', function (err, cert) {
      if (err) {
        logger.error('Cannot read public cert.', { error: err })
        return callback(err)
      }

      var urls = config.get('network.friends')
      var pods_score = {}

      async.each(urls, function (url, callback) {
        // Always add a trust pod
        pods_score[url] = Infinity

        getForeignPodsList(url, function (foreign_pods_list) {
          if (foreign_pods_list.length === 0) return callback()

          async.each(foreign_pods_list, function (foreign_pod, callback) {
            var foreign_url = foreign_pod.url
            if (pods_score[foreign_url]) pods_score[foreign_url]++
            else pods_score[foreign_url] = 1
            callback()
          }, callback)
        })
      }, function () {
        logger.debug('Pods score', { pods_score: 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 })
        })

        logger.debug('Pods that we keep', { pods: pods_list })

        var data = {
          url: http + '://' + host + ':' + port,
          publicKey: cert
        }

        logger.debug('Make requests...')

        utils.makeMultipleRetryRequest(
          { method: 'POST', path: '/api/pods/', data: data },

          pods_list,

          function eachRequest (err, response, body, url) {
            if (!err && response.statusCode === 200) {
              pods.add({ url: url, publicKey: body.cert }, function (err) {
                if (err) {
                  logger.error('Error with adding %s pod.', url, { error: err })
                }
              })
            } else {
              logger.error('Error with adding %s pod.', url)
            }
          },

          function endRequests (err) {
            if (err) {
              logger.error('There was some errors when we wanted to make friends.', { error: err })
              return callback(err)
            }

            logger.debug('Finished')
            callback(null)
          }
        )
      })
    })
  }

  module.exports = pods
})()