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