server/lib/request/base-request-scheduler.js

   1 'use strict'
   2
   3 const eachLimit = require('async/eachLimit')
   4
   5 const constants = require('../../initializers/constants')
   6 const db = require('../../initializers/database')
   7 const logger = require('../../helpers/logger')
   8 const requests = require('../../helpers/requests')
   9
  10 module.exports = class BaseRequestScheduler {
  11   constructor (options) {
  12     this.lastRequestTimestamp = 0
  13     this.timer = null
  14     this.requestInterval = constants.REQUESTS_INTERVAL
  15   }
  16
  17   activate () {
  18     logger.info('Requests scheduler activated.')
  19     this.lastRequestTimestamp = Date.now()
  20
  21     this.timer = setInterval(() => {
  22       this.lastRequestTimestamp = Date.now()
  23       this.makeRequests()
  24     }, this.requestInterval)
  25   }
  26
  27   deactivate () {
  28     logger.info('Requests scheduler deactivated.')
  29     clearInterval(this.timer)
  30     this.timer = null
  31   }
  32
  33   forceSend () {
  34     logger.info('Force requests scheduler sending.')
  35     this.makeRequests()
  36   }
  37
  38   remainingMilliSeconds () {
  39     if (this.timer === null) return -1
  40
  41     return constants.REQUESTS_INTERVAL - (Date.now() - this.lastRequestTimestamp)
  42   }
  43
  44   remainingRequestsCount (callback) {
  45     return this.getRequestModel().countTotalRequests(callback)
  46   }
  47
  48   // ---------------------------------------------------------------------------
  49
  50   // Make a requests to friends of a certain type
  51   makeRequest (toPod, requestEndpoint, requestsToMake, callback) {
  52     if (!callback) callback = function () {}
  53
  54     const params = {
  55       toPod: toPod,
  56       sign: true, // Prove our identity
  57       method: 'POST',
  58       path: '/api/' + constants.API_VERSION + '/remote/' + requestEndpoint,
  59       data: requestsToMake // Requests we need to make
  60     }
  61
  62     // Make multiple retry requests to all of pods
  63     // The function fire some useful callbacks
  64     requests.makeSecureRequest(params, (err, res) => {
  65       if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
  66         err = err ? err.message : 'Status code not 20x : ' + res.statusCode
  67         logger.error('Error sending secure request to %s pod.', toPod.host, { error: err })
  68
  69         return callback(err)
  70       }
  71
  72       return callback(null)
  73     })
  74   }
  75
  76     // Make all the requests of the scheduler
  77   makeRequests () {
  78     this.getRequestModel().listWithLimitAndRandom(this.limitPods, this.limitPerPod, (err, requests) => {
  79       if (err) {
  80         logger.error('Cannot get the list of "%s".', this.description, { err: err })
  81         return // Abort
  82       }
  83
  84       // If there are no requests, abort
  85       if (requests.length === 0) {
  86         logger.info('No "%s" to make.', this.description)
  87         return
  88       }
  89
  90       // We want to group requests by destinations pod and endpoint
  91       const requestsToMakeGrouped = this.buildRequestObjects(requests)
  92
  93       logger.info('Making "%s" to friends.', this.description)
  94
  95       const goodPods = []
  96       const badPods = []
  97
  98       eachLimit(Object.keys(requestsToMakeGrouped), constants.REQUESTS_IN_PARALLEL, (hashKey, callbackEach) => {
  99         const requestToMake = requestsToMakeGrouped[hashKey]
 100         const toPod = requestToMake.toPod
 101
 102         this.makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, (err) => {
 103           if (err) {
 104             badPods.push(requestToMake.toPod.id)
 105             return callbackEach()
 106           }
 107
 108           logger.debug('Removing requests for pod %s.', requestToMake.toPod.id, { requestsIds: requestToMake.ids })
 109           goodPods.push(requestToMake.toPod.id)
 110
 111           // Remove the pod id of these request ids
 112           this.getRequestToPodModel().removeByRequestIdsAndPod(requestToMake.ids, requestToMake.toPod.id, callbackEach)
 113
 114           this.afterRequestHook()
 115         })
 116       }, () => {
 117         // All the requests were made, we update the pods score
 118         db.Pod.updatePodsScore(goodPods, badPods)
 119
 120         this.afterRequestsHook()
 121       })
 122     })
 123   }
 124
 125   flush (callback) {
 126     this.getRequestModel().removeAll(callback)
 127   }
 128
 129   afterRequestHook () {
 130    // Nothing to do, let children reimplement it
 131   }
 132
 133   afterRequestsHook () {
 134    // Nothing to do, let children reimplement it
 135   }
 136 }