349 lines
9.4 KiB
JavaScript
349 lines
9.4 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 waterfall = require('async/waterfall')
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const values = require('lodash/values')
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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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let timer = null
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let lastRequestTimestamp = 0
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// ---------------------------------------------------------------------------
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module.exports = function (sequelize, DataTypes) {
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const Request = sequelize.define('Request',
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{
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request: {
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type: DataTypes.JSON,
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allowNull: false
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},
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endpoint: {
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type: DataTypes.ENUM(values(constants.REQUEST_ENDPOINTS)),
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allowNull: false
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}
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},
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{
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classMethods: {
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associate,
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activate,
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countTotalRequests,
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deactivate,
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flush,
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forceSend,
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remainingMilliSeconds
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}
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}
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)
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return Request
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}
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// ------------------------------ STATICS ------------------------------
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function associate (models) {
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this.belongsToMany(models.Pod, {
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foreignKey: {
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name: 'requestId',
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allowNull: false
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},
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through: models.RequestToPod,
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onDelete: 'CASCADE'
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})
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}
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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 countTotalRequests (callback) {
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const query = {
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include: [ this.sequelize.models.Pod ]
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}
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return this.count(query).asCallback(callback)
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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 (callback) {
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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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return callback(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 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 ? err.message : '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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const RequestToPod = this.sequelize.models.RequestToPod
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// We limit the size of the requests
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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_PODS, constants.REQUESTS_LIMIT_PER_POD, 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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// We want to group requests by destinations pod and endpoint
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const requestsToMakeGrouped = {}
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Object.keys(requests).forEach(function (toPodId) {
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requests[toPodId].forEach(function (data) {
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const request = data.request
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const pod = data.pod
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const hashKey = toPodId + request.endpoint
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if (!requestsToMakeGrouped[hashKey]) {
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requestsToMakeGrouped[hashKey] = {
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toPod: pod,
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endpoint: request.endpoint,
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ids: [], // 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(request.id)
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requestsToMakeGrouped[hashKey].datas.push(request.request)
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})
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})
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logger.info('Making requests to friends.', { requests: requestsToMakeGrouped })
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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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const toPod = requestToMake.toPod
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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.toPod.id)
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RequestToPod.removePodOf.call(self, requestIdsToDelete, requestToMake.toPod.id)
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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 pod %s.', requestToMake.toPod.id, { requestsIds: requestToMake.ids })
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goodPods.push(requestToMake.toPod.id)
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// Remove the pod id of these request ids
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RequestToPod.removePodOf(requestToMake.ids, requestToMake.toPod.id, callbackEach)
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} else {
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badPods.push(requestToMake.toPod.id)
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callbackEach()
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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.call(self, goodPods, badPods)
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// Flush requests with no pod
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removeWithEmptyTo.call(self, function (err) {
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if (err) logger.error('Error when removing requests with no pods.', { error: err })
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})
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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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const self = this
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waterfall([
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function findBadPods (callback) {
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self.sequelize.models.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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each(pods, function (pod, callbackEach) {
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pod.destroy().asCallback(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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const self = this
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const Pod = this.sequelize.models.Pod
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logger.info('Updating %d good pods and %d bad pods scores.', goodPods.length, badPods.length)
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if (goodPods.length !== 0) {
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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.', { error: err })
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})
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}
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if (badPods.length !== 0) {
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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.', { error: err })
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removeBadPods.call(self)
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})
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}
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}
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function listWithLimitAndRandom (limitPods, limitRequestsPerPod, callback) {
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const self = this
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const Pod = this.sequelize.models.Pod
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Pod.listRandomPodIdsWithRequest(limitPods, function (err, podIds) {
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if (err) return callback(err)
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// We don't have friends that have requests
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if (podIds.length === 0) return callback(null, [])
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// The the first x requests of these pods
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// It is very important to sort by id ASC to keep the requests order!
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const query = {
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order: [
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[ 'id', 'ASC' ]
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],
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include: [
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{
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model: self.sequelize.models.Pod,
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where: {
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id: {
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$in: podIds
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}
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}
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}
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]
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}
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self.findAll(query).asCallback(function (err, requests) {
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if (err) return callback(err)
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const requestsGrouped = groupAndTruncateRequests(requests, limitRequestsPerPod)
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return callback(err, requestsGrouped)
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})
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})
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}
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function groupAndTruncateRequests (requests, limitRequestsPerPod) {
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const requestsGrouped = {}
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requests.forEach(function (request) {
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request.Pods.forEach(function (pod) {
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if (!requestsGrouped[pod.id]) requestsGrouped[pod.id] = []
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if (requestsGrouped[pod.id].length < limitRequestsPerPod) {
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requestsGrouped[pod.id].push({
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request,
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pod
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})
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}
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})
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})
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return requestsGrouped
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}
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function removeAll (callback) {
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// Delete all requests
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this.truncate({ cascade: true }).asCallback(callback)
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}
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function removeWithEmptyTo (callback) {
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if (!callback) callback = function () {}
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const query = {
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where: {
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id: {
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$notIn: [
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this.sequelize.literal('SELECT "requestId" FROM "RequestToPods"')
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]
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}
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}
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}
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this.destroy(query).asCallback(callback)
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}
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