PeerTube/server/lib/friends.js

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'use strict'
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const each = require('async/each')
const eachLimit = require('async/eachLimit')
const eachSeries = require('async/eachSeries')
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const fs = require('fs')
const mongoose = require('mongoose')
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const request = require('request')
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const waterfall = require('async/waterfall')
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const constants = require('../initializers/constants')
const logger = require('../helpers/logger')
const requests = require('../helpers/requests')
const Pod = mongoose.model('Pod')
const Request = mongoose.model('Request')
const Video = mongoose.model('Video')
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const friends = {
addVideoToFriends,
hasFriends,
getMyCertificate,
makeFriends,
quitFriends,
removeVideoToFriends,
sendOwnedVideosToPod
}
function addVideoToFriends (video) {
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createRequest('add', constants.REQUEST_ENDPOINTS.VIDEOS, video)
}
function hasFriends (callback) {
Pod.countAll(function (err, count) {
if (err) return callback(err)
const hasFriends = (count !== 0)
callback(null, hasFriends)
})
}
function getMyCertificate (callback) {
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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)
}
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eachSeries(hosts, function (host, callbackEach) {
computeForeignPodsList(host, podsScore, callbackEach)
}, function (err) {
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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)
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})
})
}
function quitFriends (callback) {
// Stop pool requests
Request.deactivate()
// Flush pool requests
Request.flush()
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waterfall([
function getPodsList (callbackAsync) {
return Pod.list(callbackAsync)
},
function announceIQuitMyFriends (pods, callbackAsync) {
const requestParams = {
method: 'POST',
path: '/api/' + constants.API_VERSION + '/pods/remove',
sign: true
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}
// Announce we quit them
// We don't care if the request fails
// The other pod will exclude us automatically after a while
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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
}
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return callbackAsync(null, pods)
})
},
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function removePodsFromDB (pods, callbackAsync) {
each(pods, function (pod, callbackEach) {
pod.remove(callbackEach)
}, callbackAsync)
}
], function (err) {
// Don't forget to re activate the scheduler, even if there was an error
Request.activate()
if (err) return callback(err)
logger.info('Removed all remote videos.')
return callback(null)
})
}
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function removeVideoToFriends (videoParams) {
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createRequest('remove', constants.REQUEST_ENDPOINTS.VIDEOS, videoParams)
}
function sendOwnedVideosToPod (podId) {
Video.listOwned(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
}
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createRequest('add', constants.REQUEST_ENDPOINTS.VIDEOS, remoteVideo, [ podId ])
})
})
})
}
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// ---------------------------------------------------------------------------
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module.exports = friends
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// ---------------------------------------------------------------------------
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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) {
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const path = '/api/' + constants.API_VERSION + '/pods'
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request.get(constants.REMOTE_SCHEME.HTTP + '://' + host + path, function (err, response, body) {
if (err) return callback(err)
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try {
const json = JSON.parse(body)
return callback(null, json)
} catch (err) {
return callback(err)
}
})
}
function makeRequestsToWinningPods (cert, podsList, callback) {
// Stop pool requests
Request.deactivate()
// Flush pool requests
Request.forceSend()
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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 = new Pod({ host: pod.host, publicKey: body.cert })
podObj.save(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
Request.activate()
logger.debug('makeRequestsToWinningPods finished.')
return callback()
})
}
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function createRequest (type, endpoint, data, to) {
const req = new Request({
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endpoint,
request: {
type: type,
data: data
}
})
if (to) {
req.to = to
}
req.save(function (err) {
if (err) logger.error('Cannot save the request.', { error: err })
})
}
function isMe (host) {
return host === constants.CONFIG.WEBSERVER.HOST
}