1 files changed, 140 insertions, 0 deletions

diff --git a/server/lib/base-request-scheduler.js b/server/lib/base-request-scheduler.js
new file mode 100644
index 000000000..d15680c25
--- /dev/null
+++ b/server/lib/base-request-scheduler.js
@@ -0,0 +1,140 @@
+'use strict'
+
+const eachLimit = require('async/eachLimit')
+
+const constants = require('../initializers/constants')
+const db = require('../initializers/database')
+const logger = require('../helpers/logger')
+const requests = require('../helpers/requests')
+
+module.exports = class BaseRequestScheduler {
+
+  constructor (options) {
+    this.lastRequestTimestamp = 0
+    this.timer = null
+  }
+
+  activate () {
+    logger.info('Requests scheduler activated.')
+    this.lastRequestTimestamp = Date.now()
+
+    this.timer = setInterval(() => {
+      this.lastRequestTimestamp = Date.now()
+      this.makeRequests()
+    }, constants.REQUESTS_INTERVAL)
+  }
+
+  deactivate () {
+    logger.info('Requests scheduler deactivated.')
+    clearInterval(this.timer)
+    this.timer = null
+  }
+
+  forceSend () {
+    logger.info('Force requests scheduler sending.')
+    this.makeRequests()
+  }
+
+  remainingMilliSeconds () {
+    if (this.timer === null) return -1
+
+    return constants.REQUESTS_INTERVAL - (Date.now() - this.lastRequestTimestamp)
+  }
+
+  // ---------------------------------------------------------------------------
+
+  // Make a requests to friends of a certain type
+  makeRequest (toPod, requestEndpoint, requestsToMake, callback) {
+    if (!callback) callback = function () {}
+
+    const params = {
+      toPod: toPod,
+      sign: true, // Prove our identity
+      method: 'POST',
+      path: '/api/' + constants.API_VERSION + '/remote/' + requestEndpoint,
+      data: requestsToMake // Requests we need to make
+    }
+
+    // Make multiple retry requests to all of pods
+    // The function fire some useful callbacks
+    requests.makeSecureRequest(params, (err, res) => {
+      if (err || (res.statusCode !== 200 && res.statusCode !== 201 && res.statusCode !== 204)) {
+        err = err ? err.message : 'Status code not 20x : ' + res.statusCode
+        logger.error('Error sending secure request to %s pod.', toPod.host, { error: err })
+
+        return callback(false)
+      }
+
+      return callback(true)
+    })
+  }
+
+    // Make all the requests of the scheduler
+  makeRequests () {
+    this.getRequestModel().listWithLimitAndRandom(this.limitPods, this.limitPerPod, (err, requests) => {
+      if (err) {
+        logger.error('Cannot get the list of "%s".', this.description, { err: err })
+        return // Abort
+      }
+
+      // If there are no requests, abort
+      if (requests.length === 0) {
+        logger.info('No "%s" to make.', this.description)
+        return
+      }
+
+      // We want to group requests by destinations pod and endpoint
+      const requestsToMakeGrouped = this.buildRequestObjects(requests)
+
+      logger.info('Making "%s" to friends.', this.description)
+
+      const goodPods = []
+      const badPods = []
+
+      eachLimit(Object.keys(requestsToMakeGrouped), constants.REQUESTS_IN_PARALLEL, (hashKey, callbackEach) => {
+        const requestToMake = requestsToMakeGrouped[hashKey]
+        const toPod = requestToMake.toPod
+
+        // Maybe the pod is not our friend anymore so simply remove it
+        if (!toPod) {
+          const requestIdsToDelete = requestToMake.ids
+
+          logger.info('Removing %d "%s" of unexisting pod %s.', requestIdsToDelete.length, this.description, requestToMake.toPod.id)
+          return this.getRequestToPodModel().removePodOf(requestIdsToDelete, requestToMake.toPod.id, callbackEach)
+        }
+
+        this.makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, (success) => {
+          if (success === false) {
+            badPods.push(requestToMake.toPod.id)
+            return callbackEach()
+          }
+
+          logger.debug('Removing requests for pod %s.', requestToMake.toPod.id, { requestsIds: requestToMake.ids })
+          goodPods.push(requestToMake.toPod.id)
+
+          // Remove the pod id of these request ids
+          this.getRequestToPodModel().removeByRequestIdsAndPod(requestToMake.ids, requestToMake.toPod.id, callbackEach)
+
+          this.afterRequestHook()
+        })
+      }, () => {
+        // All the requests were made, we update the pods score
+        db.Pod.updatePodsScore(goodPods, badPods)
+
+        this.afterRequestsHook()
+      })
+    })
+  }
+
+  flush (callback) {
+    this.getRequestModel().removeAll(callback)
+  }
+
+  afterRequestHook () {
+   // Nothing to do, let children reimplement it
+  }
+
+  afterRequestsHook () {
+   // Nothing to do, let children reimplement it
+  }
+}