From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../client/netmonitor/src/middleware/batching.js   | 146 +++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 devtools/client/netmonitor/src/middleware/batching.js

(limited to 'devtools/client/netmonitor/src/middleware/batching.js')

diff --git a/devtools/client/netmonitor/src/middleware/batching.js b/devtools/client/netmonitor/src/middleware/batching.js
new file mode 100644
index 0000000000..9d8c57084c
--- /dev/null
+++ b/devtools/client/netmonitor/src/middleware/batching.js
@@ -0,0 +1,146 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  BATCH_ACTIONS,
+  BATCH_ENABLE,
+  BATCH_RESET,
+  BATCH_FLUSH,
+} = require("resource://devtools/client/netmonitor/src/constants.js");
+
+const REQUESTS_REFRESH_RATE = 50; // ms
+
+/**
+ * Middleware that watches for actions with a "batch = true" value in their meta field.
+ * These actions are queued and dispatched as one batch after a timeout.
+ * Special actions that are handled by this middleware:
+ * - BATCH_ENABLE can be used to enable and disable the batching.
+ * - BATCH_RESET discards the actions that are currently in the queue.
+ */
+function batchingMiddleware(store) {
+  return next => {
+    let queuedActions = [];
+    let enabled = true;
+    let flushTask = null;
+
+    return action => {
+      if (action.type === BATCH_ENABLE) {
+        return setEnabled(action.enabled);
+      }
+
+      if (action.type === BATCH_RESET) {
+        return resetQueue();
+      }
+
+      if (action.type === BATCH_FLUSH) {
+        return flushQueue();
+      }
+
+      if (action.meta?.batch) {
+        if (!enabled) {
+          next(action);
+          return Promise.resolve();
+        }
+
+        queuedActions.push(action);
+
+        if (!flushTask) {
+          flushTask = new DelayedTask(flushActions, REQUESTS_REFRESH_RATE);
+        }
+
+        return flushTask.promise;
+      }
+
+      return next(action);
+    };
+
+    function setEnabled(value) {
+      enabled = value;
+
+      // If disabling the batching, flush the actions that have been queued so far
+      if (!enabled && flushTask) {
+        flushTask.runNow();
+      }
+    }
+
+    function resetQueue() {
+      queuedActions = [];
+
+      if (flushTask) {
+        flushTask.cancel();
+        flushTask = null;
+      }
+    }
+
+    function flushQueue() {
+      if (flushTask) {
+        flushTask.runNow();
+      }
+    }
+
+    function flushActions() {
+      const actions = queuedActions;
+      queuedActions = [];
+
+      next({
+        type: BATCH_ACTIONS,
+        actions,
+      });
+
+      flushTask = null;
+    }
+  };
+}
+
+/**
+ * Create a delayed task that calls the specified task function after a delay.
+ */
+function DelayedTask(taskFn, delay) {
+  this._promise = new Promise((resolve, reject) => {
+    this.runTask = cancel => {
+      if (cancel) {
+        reject("Task cancelled");
+      } else {
+        taskFn();
+        resolve();
+      }
+      this.runTask = null;
+    };
+    this.timeout = setTimeout(this.runTask, delay);
+  }).catch(console.error);
+}
+
+DelayedTask.prototype = {
+  /**
+   * Return a promise that is resolved after the task is performed or canceled.
+   */
+  get promise() {
+    return this._promise;
+  },
+
+  /**
+   * Cancel the execution of the task.
+   */
+  cancel() {
+    clearTimeout(this.timeout);
+    if (this.runTask) {
+      this.runTask(true);
+    }
+  },
+
+  /**
+   * Execute the scheduled task immediately, without waiting for the timeout.
+   * Resolves the promise correctly.
+   */
+  runNow() {
+    clearTimeout(this.timeout);
+    if (this.runTask) {
+      this.runTask();
+    }
+  },
+};
+
+module.exports = batchingMiddleware;
-- 
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