2017-02-18 03:29:36 -06:00
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'use strict'
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const eachLimit = require('async/eachLimit')
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const constants = require('../initializers/constants')
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const db = require('../initializers/database')
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const logger = require('../helpers/logger')
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const requests = require('../helpers/requests')
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module.exports = class RequestScheduler {
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2017-02-18 11:37:26 -06:00
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constructor () {
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2017-02-18 03:29:36 -06:00
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this.lastRequestTimestamp = 0
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this.timer = null
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}
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activate () {
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logger.info('Requests scheduler activated.')
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this.lastRequestTimestamp = Date.now()
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this.timer = setInterval(() => {
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this.lastRequestTimestamp = Date.now()
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this.makeRequests()
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}, constants.REQUESTS_INTERVAL)
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}
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deactivate () {
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logger.info('Requests scheduler deactivated.')
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clearInterval(this.timer)
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this.timer = null
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}
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forceSend () {
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logger.info('Force requests scheduler sending.')
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this.makeRequests()
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}
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remainingMilliSeconds () {
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if (this.timer === null) return -1
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return constants.REQUESTS_INTERVAL - (Date.now() - this.lastRequestTimestamp)
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}
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// { type, endpoint, data, toIds, transaction }
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createRequest (options, callback) {
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const type = options.type
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const endpoint = options.endpoint
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const data = options.data
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const toIds = options.toIds
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const transaction = options.transaction
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const pods = []
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// If there are no destination pods abort
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if (toIds.length === 0) return callback(null)
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toIds.forEach(toPod => {
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pods.push(db.Pod.build({ id: toPod }))
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})
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const createQuery = {
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endpoint,
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request: {
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type: type,
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data: data
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}
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}
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const dbRequestOptions = {
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transaction
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}
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return db.Request.create(createQuery, dbRequestOptions).asCallback((err, request) => {
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if (err) return callback(err)
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return request.setPods(pods, dbRequestOptions).asCallback(callback)
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})
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}
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// ---------------------------------------------------------------------------
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// Make all the requests of the scheduler
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makeRequests () {
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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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db.Request.listWithLimitAndRandom(constants.REQUESTS_LIMIT_PODS, constants.REQUESTS_LIMIT_PER_POD, (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 = this.buildRequestObjects(requests)
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logger.info('Making requests to friends.')
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const goodPods = []
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const badPods = []
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eachLimit(Object.keys(requestsToMakeGrouped), constants.REQUESTS_IN_PARALLEL, (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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return db.RequestToPod.removePodOf(requestIdsToDelete, requestToMake.toPod.id, callbackEach)
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}
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this.makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, (success) => {
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if (success === false) {
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badPods.push(requestToMake.toPod.id)
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return callbackEach()
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}
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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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db.RequestToPod.removePodOf(requestToMake.ids, requestToMake.toPod.id, callbackEach)
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})
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}, () => {
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// All the requests were made, we update the pods score
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db.Request.updatePodsScore(goodPods, badPods)
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// Flush requests with no pod
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db.Request.removeWithEmptyTo(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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// Make a requests to friends of a certain type
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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, (err, res) => {
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if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
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err = err ? err.message : 'Status code not 20x : ' + res.statusCode
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logger.error('Error sending secure request to %s pod.', toPod.host, { error: err })
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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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buildRequestObjects (requests) {
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const requestsToMakeGrouped = {}
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Object.keys(requests).forEach(toPodId => {
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requests[toPodId].forEach(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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return requestsToMakeGrouped
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}
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flush (callback) {
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db.Request.removeAll(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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}
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