Clear DevTools temp storage

Source/devtools/front_end/TempStorageSharedWorker.js

+/*
+ * Copyright (C) 2014 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+var ports = [];
+var isTempStorageCleared = false;
+/**
+ * @type {string}
+ */
+var tempStorageError;
+
+/**
+ * @param {!MessageEvent} event
+ */
+self.onconnect = function(event)
+{
+    var newPort = /** @type {!MessagePort} */ (event.ports[0]);
+    if (isTempStorageCleared) {
+        notifyTempStorageCleared(newPort);
+        return;
+    }
+
+    newPort.onmessage = handleMessage;
+    newPort.onerror = handleError;
+    ports.push(newPort);
+
+    if (ports.length === 1)
+        clearTempStorage();
+}
+
+function clearTempStorage()
+{
+    function didFail(e)
+    {
+        tempStorageError = "Failed to clear temp storage: " + e.message + " " + e.name;
+        console.error(tempStorageError);
+        didClearTempStorage();
+    }
+    /**
+     * @param {!FileSystem} fs
+     */
+    function didGetFS(fs)
+    {
+        fs.root.createReader().readEntries(didReadEntries, didFail);
+    }
+    /**
+     * @param {!Array.<!Entry>} entries
+     */
+    function didReadEntries(entries)
+    {
+        var remainingEntries = entries.length;
+        if (!remainingEntries) {
+            didClearTempStorage();
+            return;
+        }
+        function didDeleteEntry()
+        {
+            if (!--remainingEntries)
+                didClearTempStorage();
+        }
+        function failedToDeleteEntry(e)
+        {
+            tempStorageError = "Failed to delete entry: " + e.message + " " + e.name;
+            console.error(tempStorageError);
+            didDeleteEntry();
+        }
+        for (var i = 0; i < entries.length; i++) {
+            var entry = entries[i];
+            if (entry.isFile)
+                entry.remove(didDeleteEntry, failedToDeleteEntry);
+            else
+                entry.removeRecursively(didDeleteEntry, failedToDeleteEntry);
+        }
+    }
+    self.webkitRequestFileSystem(self.TEMPORARY, 10, didGetFS, didFail);
+}
+
+function didClearTempStorage()
+{
+  isTempStorageCleared = true;
+  for (var i = 0; i < ports.length; i++)
+      notifyTempStorageCleared(ports[i]);
+  ports = null;
+}
+
+/**
+ * @param {!MessagePort} port
+ */
+function notifyTempStorageCleared(port)
+{
+    port.postMessage({
+        type: "tempStorageCleared",
+        error: tempStorageError
+    });
+}
+
+function handleMessage(event)
+{
+    if (event.data.type === "disconnect")
+        removePort(event.target);
+}
+
+function handleError(event)
+{
+    console.error("Error: " + event.data);
+    removePort(event.target);
+}
+
+function removePort(port)
+{
+    if (!ports)
+        return;
+    var index = ports.indexOf(port);
+    ports.splice(index, 1);
+}