server/lib/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
  12   constructor (options) {
  13     this.lastRequestTimestamp = 0
  14     this.timer = null
  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     }, constants.REQUESTS_INTERVAL)
  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   // ---------------------------------------------------------------------------
  45
  46   // Make a requests to friends of a certain type
  47   makeRequest (toPod, requestEndpoint, requestsToMake, callback) {
  48     if (!callback) callback = function () {}
  49
  50     const params = {
  51       toPod: toPod,
  52       sign: true, // Prove our identity
  53       method: 'POST',
  54       path: '/api/' + constants.API_VERSION + '/remote/' + requestEndpoint,
  55       data: requestsToMake // Requests we need to make
  56     }
  57
  58     // Make multiple retry requests to all of pods
  59     // The function fire some useful callbacks
  60     requests.makeSecureRequest(params, (err, res) => {
  61       if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
  62         err = err ? err.message : 'Status code not 20x : ' + res.statusCode
  63         logger.error('Error sending secure request to %s pod.', toPod.host, { error: err })
  64
  65         return callback(false)
  66       }
  67
  68       return callback(true)
  69     })
  70   }
  71
  72     // Make all the requests of the scheduler
  73   makeRequests () {
  74     this.getRequestModel().listWithLimitAndRandom(this.limitPods, this.limitPerPod, (err, requests) => {
  75       if (err) {
  76         logger.error('Cannot get the list of "%s".', this.description, { err: err })
  77         return // Abort
  78       }
  79
  80       // If there are no requests, abort
  81       if (requests.length === 0) {
  82         logger.info('No "%s" to make.', this.description)
  83         return
  84       }
  85
  86       // We want to group requests by destinations pod and endpoint
  87       const requestsToMakeGrouped = this.buildRequestObjects(requests)
  88
  89       logger.info('Making "%s" to friends.', this.description)
  90
  91       const goodPods = []
  92       const badPods = []
  93
  94       eachLimit(Object.keys(requestsToMakeGrouped), constants.REQUESTS_IN_PARALLEL, (hashKey, callbackEach) => {
  95         const requestToMake = requestsToMakeGrouped[hashKey]
  96         const toPod = requestToMake.toPod
  97
  98         this.makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, (success) => {
  99           if (success === false) {
 100             badPods.push(requestToMake.toPod.id)
 101             return callbackEach()
 102           }
 103
 104           logger.debug('Removing requests for pod %s.', requestToMake.toPod.id, { requestsIds: requestToMake.ids })
 105           goodPods.push(requestToMake.toPod.id)
 106
 107           // Remove the pod id of these request ids
 108           this.getRequestToPodModel().removeByRequestIdsAndPod(requestToMake.ids, requestToMake.toPod.id, callbackEach)
 109
 110           this.afterRequestHook()
 111         })
 112       }, () => {
 113         // All the requests were made, we update the pods score
 114         db.Pod.updatePodsScore(goodPods, badPods)
 115
 116         this.afterRequestsHook()
 117       })
 118     })
 119   }
 120
 121   flush (callback) {
 122     this.getRequestModel().removeAll(callback)
 123   }
 124
 125   afterRequestHook () {
 126    // Nothing to do, let children reimplement it
 127   }
 128
 129   afterRequestsHook () {
 130    // Nothing to do, let children reimplement it
 131   }
 132 }