1 files changed, 93 insertions, 0 deletions
diff --git a/js/logger.js b/js/logger.js
new file mode 100644
index 0000000..896fbdf
--- /dev/null
+++ b/js/logger.js
@@ -0,0 +1,93 @@
+/*******************************************************************************
+
+    ηMatrix - a browser extension to black/white list requests.
+    Copyright (C) 2015-2019 Raymond Hill
+    Copyright (C) 2019 Alessio Vanni
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    uMatrix Home: https://github.com/gorhill/uBlock
+*/
+
+'use strict';
+
+/******************************************************************************/
+/******************************************************************************/
+
+µMatrix.logger = (function() {
+
+    var LogEntry = function(args) {
+        this.init(args);
+    };
+
+    LogEntry.prototype.init = function(args) {
+        this.tstamp = Date.now();
+        this.tab = args[0] || '';
+        this.cat = args[1] || '';
+        this.d0 = args[2];
+        this.d1 = args[3];
+        this.d2 = args[4];
+        this.d3 = args[5];
+    };
+
+    var buffer = null;
+    var lastReadTime = 0;
+    var writePtr = 0;
+
+    // After 60 seconds without being read, a buffer will be considered
+    // unused, and thus removed from memory.
+    var logBufferObsoleteAfter = 30 * 1000;
+
+    var janitor = function() {
+        if (
+            buffer !== null &&
+            lastReadTime < (Date.now() - logBufferObsoleteAfter)
+        ) {
+            buffer = null;
+            writePtr = 0;
+            api.ownerId = undefined;
+        }
+        if ( buffer !== null ) {
+            vAPI.setTimeout(janitor, logBufferObsoleteAfter);
+        }
+    };
+
+    var api = {
+        ownerId: undefined,
+        writeOne: function() {
+            if ( buffer === null ) { return; }
+            if ( writePtr === buffer.length ) {
+                buffer.push(new LogEntry(arguments));
+            } else {
+                buffer[writePtr].init(arguments);
+            }
+            writePtr += 1;
+        },
+        readAll: function(ownerId) {
+            this.ownerId = ownerId;
+            if ( buffer === null ) {
+                buffer = [];
+                vAPI.setTimeout(janitor, logBufferObsoleteAfter);
+            }
+            var out = buffer.slice(0, writePtr);
+            writePtr = 0;
+            lastReadTime = Date.now();
+            return out;
+        }
+    };
+
+    return api;
+})();
+
+/******************************************************************************/