PeerTube/server/lib/friends.js

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'use strict'
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const async = require('async')
const config = require('config')
const fs = require('fs')
const request = require('request')
const constants = require('../initializers/constants')
const logger = require('../helpers/logger')
const peertubeCrypto = require('../helpers/peertubeCrypto')
const Pods = require('../models/pods')
const requestsScheduler = require('../lib/requestsScheduler')
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const requests = require('../helpers/requests')
const Videos = require('../models/videos')
const http = config.get('webserver.https') ? 'https' : 'http'
const host = config.get('webserver.host')
const port = config.get('webserver.port')
const pods = {
addVideoToFriends: addVideoToFriends,
hasFriends: hasFriends,
makeFriends: makeFriends,
quitFriends: quitFriends,
removeVideoToFriends: removeVideoToFriends
}
function addVideoToFriends (video) {
// To avoid duplicates
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const id = video.name + video.magnetUri
// ensure namePath is null
video.namePath = null
requestsScheduler.addRequest(id, 'add', video)
}
function hasFriends (callback) {
Pods.count(function (err, count) {
if (err) return callback(err)
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const has_friends = (count !== 0)
callback(null, has_friends)
})
}
function makeFriends (callback) {
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const 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)
}
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const urls = config.get('network.friends')
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async.each(urls, function (url, callback) {
computeForeignPodsList(url, pods_score, callback)
}, function (err) {
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if (err) return callback(err)
logger.debug('Pods scores computed.', { pods_score: pods_score })
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const pods_list = computeWinningPods(urls, pods_score)
logger.debug('Pods that we keep.', { pods_to_keep: pods_list })
makeRequestsToWinningPods(cert, pods_list, callback)
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})
})
}
function quitFriends (callback) {
// Stop pool requests
requestsScheduler.deactivate()
// Flush pool requests
requestsScheduler.forceSend()
Pods.list(function (err, pods) {
if (err) return callback(err)
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const request = {
method: 'POST',
path: '/api/' + constants.API_VERSION + '/pods/remove',
sign: true,
encrypt: true,
data: {
url: 'me' // Fake data
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}
}
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// Announce we quit them
requests.makeMultipleRetryRequest(request, pods, function () {
Pods.removeAll(function (err) {
requestsScheduler.activate()
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if (err) return callback(err)
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logger.info('Broke friends, so sad :(')
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Videos.removeAllRemotes(function (err) {
if (err) return callback(err)
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logger.info('Removed all remote videos.')
callback(null)
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})
})
})
})
}
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function removeVideoToFriends (video) {
// To avoid duplicates
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const id = video.name + video.magnetUri
requestsScheduler.addRequest(id, 'remove', video)
}
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// ---------------------------------------------------------------------------
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module.exports = pods
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// ---------------------------------------------------------------------------
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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) {
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const 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
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const pods_list = []
const 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) {
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const path = '/api/' + constants.API_VERSION + '/pods'
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request.get(url + path, function (err, response, body) {
if (err) return callback(err)
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callback(null, JSON.parse(body))
})
}
function makeRequestsToWinningPods (cert, pods_list, callback) {
// Stop pool requests
requestsScheduler.deactivate()
// Flush pool requests
requestsScheduler.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)
}
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const 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
requestsScheduler.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)
}
)
})
}