1 files changed, 156 insertions, 0 deletions

diff --git a/server/lib/request/abstract-request-scheduler.ts b/server/lib/request/abstract-request-scheduler.ts
new file mode 100644
index 000000000..e81ab9c36
--- /dev/null
+++ b/server/lib/request/abstract-request-scheduler.ts
@@ -0,0 +1,156 @@
+import * as eachLimit from 'async/eachLimit'
+
+import { database as db } from '../../initializers/database'
+import { logger, makeSecureRequest } from '../../helpers'
+import { PodInstance } from '../../models'
+import {
+  API_VERSION,
+  REQUESTS_IN_PARALLEL,
+  REQUESTS_INTERVAL
+} from '../../initializers'
+
+abstract class AbstractRequestScheduler {
+  requestInterval: number
+  limitPods: number
+  limitPerPod: number
+
+  protected lastRequestTimestamp: number
+  protected timer: NodeJS.Timer
+  protected description: string
+
+  constructor () {
+    this.lastRequestTimestamp = 0
+    this.timer = null
+    this.requestInterval = REQUESTS_INTERVAL
+  }
+
+  abstract getRequestModel ()
+  abstract getRequestToPodModel ()
+  abstract buildRequestObjects (requests: any)
+
+  activate () {
+    logger.info('Requests scheduler activated.')
+    this.lastRequestTimestamp = Date.now()
+
+    this.timer = setInterval(() => {
+      this.lastRequestTimestamp = Date.now()
+      this.makeRequests()
+    }, this.requestInterval)
+  }
+
+  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 REQUESTS_INTERVAL - (Date.now() - this.lastRequestTimestamp)
+  }
+
+  remainingRequestsCount (callback: (err: Error, total: number) => void) {
+    return this.getRequestModel().countTotalRequests(callback)
+  }
+
+  flush (callback: (err: Error) => void) {
+    this.getRequestModel().removeAll(callback)
+  }
+
+  // ---------------------------------------------------------------------------
+
+  // Make a requests to friends of a certain type
+  protected makeRequest (toPod: PodInstance, requestEndpoint: string, requestsToMake: Object, callback) {
+    if (!callback) callback = function () { /* empty */ }
+
+    const params = {
+      toPod: toPod,
+      sign: true, // Prove our identity
+      method: 'POST' as 'POST',
+      path: '/api/' + 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
+    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(err)
+      }
+
+      return callback(null)
+    })
+  }
+
+    // Make all the requests of the scheduler
+  protected 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), REQUESTS_IN_PARALLEL, (hashKey, callbackEach) => {
+        const requestToMake = requestsToMakeGrouped[hashKey]
+        const toPod = requestToMake.toPod
+
+        this.makeRequest(toPod, requestToMake.endpoint, requestToMake.datas, (err) => {
+          if (err) {
+            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()
+      })
+    })
+  }
+
+  protected afterRequestHook () {
+   // Nothing to do, let children reimplement it
+  }
+
+  protected afterRequestsHook () {
+   // Nothing to do, let children reimplement it
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  AbstractRequestScheduler
+}