send messages by batch

Author: ggazzo

lib/server/push.api.js

@@ -14,15 +14,15 @@ Push.setBadge = function(/* id, count */) {
 
 var isConfigured = false;
 
-var sendWorker = function(task, interval) {
+var scheduleTask = function(task, interval) {
   if (typeof Push.Log === 'function') {
     Push.Log('Push: Send worker started, using interval:', interval);
   }
   if (Push.debug) {
     console.log('Push: Send worker started, using interval: ' + interval);
   }
 
-  return Meteor.setInterval(function() {
+  return Meteor.setTimeout(function() {
     // xxx: add exponential backoff on error
     try {
       task();
@@ -668,41 +668,46 @@ Push.Configure = function(options) {
         } // Else could not reserve
       }; // EO sendNotification
 
-      sendWorker(function() {
+      const processQueue = async function() {
 
-          if (isSendingNotification) {
-              return;
-          }
+        if (isSendingNotification) {
+            return;
+        }
 
-          try {
+        // Set send fence
+        isSendingNotification = true;
 
-            // Set send fence
-            isSendingNotification = true;
+        // var countSent = 0;
+        var batchSize = options.sendBatchSize || 1;
 
-            // var countSent = 0;
-            var batchSize = options.sendBatchSize || 1;
+        var now = +new Date();
 
-            var now = +new Date();
+        // Find notifications that are not being or already sent
+        var pendingNotifications = Push.notifications.find({ $and: [
+              // Message is not sent
+              { sent : false },
+              // And not being sent by other instances
+              { sending: { $lt: now } },
+              // And not queued for future
+              { $or: [
+                  { delayUntil: { $exists: false } },
+                  { delayUntil:  { $lte: new Date() } }
+                ]
+              }
+          ]}, {
+            // Sort by created date
+            sort: { createdAt: 1 },
+            limit: batchSize
+          }).fetch();
 
-            // Find notifications that are not being or already sent
-            var pendingNotifications = Push.notifications.find({ $and: [
-                  // Message is not sent
-                  { sent : false },
-                  // And not being sent by other instances
-                  { sending: { $lt: now } },
-                  // And not queued for future
-                  { $or: [
-                      { delayUntil: { $exists: false } },
-                      { delayUntil:  { $lte: new Date() } }
-                    ]
-                  }
-              ]}, {
-                // Sort by created date
-                sort: { createdAt: 1 },
-                limit: batchSize
-              });
 
-            pendingNotifications.forEach(function(notification) {
+        if(pendingNotifications.length === 0) {
+          return scheduleTask(processQueue, options.sendInterval || 15000);
+        }
+
+        await Promise.all(pendingNotifications.map(function(notification) {
+          return new Promise((resolve, reject) => {
+            Meteor.defer(() => {
               try {
                 sendNotification(notification);
               } catch(error) {
@@ -712,14 +717,21 @@ Push.Configure = function(options) {
                 if (Push.debug) {
                   console.log('Push: Could not send notification id: "' + notification._id + '", Error: ' + error.message);
                 }
+              } finally {
+                resolve();
               }
-            }); // EO forEach
-          } finally {
+            });
+          })
+        })); // EO forEach
 
-            // Remove the send fence
-            isSendingNotification = false;
-          }
-      }, options.sendInterval || 15000); // Default every 15th sec
+        // Remove the send fence
+        isSendingNotification = false;
+
+        processQueue(); // continue asap
+
+    }
+
+    scheduleTask(processQueue, options.sendInterval || 15000);
 
     } else {
       if (Push.debug) {