PeerTube/server/models/request.js

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'use strict'
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const each = require('async/each')
const eachLimit = require('async/eachLimit')
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const values = require('lodash/values')
const mongoose = require('mongoose')
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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')
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let timer = null
let lastRequestTimestamp = 0
// ---------------------------------------------------------------------------
const RequestSchema = mongoose.Schema({
request: mongoose.Schema.Types.Mixed,
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endpoint: {
type: String,
enum: [ values(constants.REQUEST_ENDPOINTS) ]
},
to: [
{
type: mongoose.Schema.Types.ObjectId,
ref: 'Pod'
}
]
})
RequestSchema.statics = {
activate,
deactivate,
flush,
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forceSend,
list,
remainingMilliSeconds
}
RequestSchema.pre('save', function (next) {
const self = this
if (self.to.length === 0) {
Pod.listAllIds(function (err, podIds) {
if (err) return next(err)
// No friends
if (podIds.length === 0) return
self.to = podIds
return next()
})
} else {
return next()
}
})
mongoose.model('Request', RequestSchema)
// ------------------------------ STATICS ------------------------------
function activate () {
logger.info('Requests scheduler activated.')
lastRequestTimestamp = Date.now()
const self = this
timer = setInterval(function () {
lastRequestTimestamp = Date.now()
makeRequests.call(self)
}, constants.REQUESTS_INTERVAL)
}
function deactivate () {
logger.info('Requests scheduler deactivated.')
clearInterval(timer)
timer = null
}
function flush () {
removeAll.call(this, function (err) {
if (err) logger.error('Cannot flush the requests.', { error: err })
})
}
function forceSend () {
logger.info('Force requests scheduler sending.')
makeRequests.call(this)
}
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function list (callback) {
this.find({ }, callback)
}
function remainingMilliSeconds () {
if (timer === null) return -1
return constants.REQUESTS_INTERVAL - (Date.now() - lastRequestTimestamp)
}
// ---------------------------------------------------------------------------
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// Make a requests to friends of a certain type
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function makeRequest (toPod, requestEndpoint, requestsToMake, callback) {
if (!callback) callback = function () {}
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const params = {
toPod: toPod,
encrypt: true, // Security
sign: true, // To prove our identity
method: 'POST',
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path: '/api/' + constants.API_VERSION + '/remote/' + requestEndpoint,
data: requestsToMake // Requests we need to make
}
// Make multiple retry requests to all of pods
// The function fire some useful callbacks
requests.makeSecureRequest(params, function (err, res) {
if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
logger.error(
'Error sending secure request to %s pod.',
toPod.url,
{
error: err || new Error('Status code not 20x : ' + res.statusCode)
}
)
return callback(false)
}
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return callback(true)
})
}
// Make all the requests of the scheduler
function makeRequests () {
const self = this
// We limit the size of the requests (REQUESTS_LIMIT)
// We don't want to stuck with the same failing requests so we get a random list
listWithLimitAndRandom.call(self, constants.REQUESTS_LIMIT, function (err, requests) {
if (err) {
logger.error('Cannot get the list of requests.', { err: err })
return // Abort
}
// If there are no requests, abort
if (requests.length === 0) {
logger.info('No requests to make.')
return
}
logger.info('Making requests to friends.')
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// We want to group requests by destinations pod and endpoint
const requestsToMakeGrouped = {}
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requests.forEach(function (poolRequest) {
poolRequest.to.forEach(function (toPodId) {
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const hashKey = toPodId + poolRequest.endpoint
if (!requestsToMakeGrouped[hashKey]) {
requestsToMakeGrouped[hashKey] = {
toPodId,
endpoint: poolRequest.endpoint,
ids: [], // pool request ids, to delete them from the DB in the future
datas: [] // requests data,
}
}
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requestsToMakeGrouped[hashKey].ids.push(poolRequest._id)
requestsToMakeGrouped[hashKey].datas.push(poolRequest.request)
})
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})
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const goodPods = []
const badPods = []
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eachLimit(Object.keys(requestsToMakeGrouped), constants.REQUESTS_IN_PARALLEL, function (hashKey, callbackEach) {
const requestToMake = requestsToMakeGrouped[hashKey]
// FIXME: mongodb request inside a loop :/
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Pod.load(requestToMake.toPodId, function (err, toPod) {
if (err) {
logger.error('Error finding pod by id.', { err: err })
return callbackEach()
}
// Maybe the pod is not our friend anymore so simply remove it
if (!toPod) {
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const requestIdsToDelete = requestToMake.ids
logger.info('Removing %d requests of unexisting pod %s.', requestIdsToDelete.length, requestToMake.toPodId)
removePodOf.call(self, requestIdsToDelete, requestToMake.toPodId)
return callbackEach()
}
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makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, function (success) {
if (success === true) {
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logger.debug('Removing requests for %s pod.', requestToMake.toPodId, { requestsIds: requestToMake.ids })
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goodPods.push(requestToMake.toPodId)
// Remove the pod id of these request ids
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removePodOf.call(self, requestToMake.ids, requestToMake.toPodId, callbackEach)
} else {
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badPods.push(requestToMake.toPodId)
callbackEach()
}
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})
})
}, function () {
// All the requests were made, we update the pods score
updatePodsScore(goodPods, badPods)
// Flush requests with no pod
removeWithEmptyTo.call(self)
})
})
}
// Remove pods with a score of 0 (too many requests where they were unreachable)
function removeBadPods () {
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waterfall([
function findBadPods (callback) {
Pod.listBadPods(function (err, pods) {
if (err) {
logger.error('Cannot find bad pods.', { error: err })
return callback(err)
}
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return callback(null, pods)
})
},
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function removeTheseBadPods (pods, callback) {
if (pods.length === 0) return callback(null, 0)
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each(pods, function (pod, callbackEach) {
pod.remove(callbackEach)
}, function (err) {
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return callback(err, pods.length)
})
}
], function (err, numberOfPodsRemoved) {
if (err) {
logger.error('Cannot remove bad pods.', { error: err })
} else if (numberOfPodsRemoved) {
logger.info('Removed %d pods.', numberOfPodsRemoved)
} else {
logger.info('No need to remove bad pods.')
}
})
}
function updatePodsScore (goodPods, badPods) {
logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length)
Pod.incrementScores(goodPods, constants.PODS_SCORE.BONUS, function (err) {
if (err) logger.error('Cannot increment scores of good pods.')
})
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Pod.incrementScores(badPods, constants.PODS_SCORE.MALUS, function (err) {
if (err) logger.error('Cannot decrement scores of bad pods.')
removeBadPods()
})
}
function listWithLimitAndRandom (limit, callback) {
const self = this
self.count(function (err, count) {
if (err) return callback(err)
let start = Math.floor(Math.random() * count) - limit
if (start < 0) start = 0
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self.find().sort({ _id: 1 }).skip(start).limit(limit).exec(callback)
})
}
function removeAll (callback) {
this.remove({ }, callback)
}
function removePodOf (requestsIds, podId, callback) {
if (!callback) callback = function () {}
this.update({ _id: { $in: requestsIds } }, { $pull: { to: podId } }, { multi: true }, callback)
}
function removeWithEmptyTo (callback) {
if (!callback) callback = function () {}
this.remove({ to: { $size: 0 } }, callback)
}