ServiceProcessControl to launch a service process and communicate through IPC.

Added two class for use with service process:

ServiceProcessControl
Used by the browser to launch and connect to the service process, also used
to receive messages from the service process.

ServiceProcessControlManager
A singleton to manage multiple ServicProcessControl.

BUG=50244
TEST=browser_tests --gtest_filter=ServiceProcess*

Review URL: http://codereview.chromium.org/3032061

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55826 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 55 insertions, 0 deletions

diff --git a/chrome/common/service_process_util.cc b/chrome/common/service_process_util.cc
new file mode 100644
index 0000000..4be6991
--- /dev/null
+++ b/chrome/common/service_process_util.cc
@@ -0,0 +1,55 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/common/chrome_constants.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/service_process_util.h"
+
+// TODO(hclam): |type| is not used at all. Different types of service process
+// should have a different instance of process and channel.
+std::string GetServiceProcessChannelName(ServiceProcessType type) {
+  FilePath user_data_dir;
+  PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
+
+  // TODO(sanjeevr): We need to actually figure out the right way to determine
+  // a channel name. The below is to facilitate testing only.
+#if defined(OS_WIN)
+  std::string channel_name = WideToUTF8(user_data_dir.value());
+#elif defined(OS_POSIX)
+  std::string channel_name = user_data_dir.value();
+#endif  // defined(OS_WIN)
+  std::replace(channel_name.begin(), channel_name.end(), '\\', '!');
+  channel_name.append("_service_ipc");
+  return channel_name;
+}
+
+// Gets the name of the lock file for service process.
+static FilePath GetServiceProcessLockFilePath(ServiceProcessType type) {
+  FilePath user_data_dir;
+  PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
+  return user_data_dir.Append(FILE_PATH_LITERAL("Service Process.Lock"));
+}
+
+bool CreateServiceProcessLockFile(ServiceProcessType type) {
+  const FilePath path = GetServiceProcessLockFilePath(type);
+  FILE* file = file_util::OpenFile(path, "wb+");
+  if (!file)
+    return false;
+  LOG(INFO) << "Created Service Process lock file: " << path.value();
+  return file_util::TruncateFile(file) && file_util::CloseFile(file);
+}
+
+bool DeleteServiceProcessLockFile(ServiceProcessType type) {
+  const FilePath path = GetServiceProcessLockFilePath(type);
+  return file_util::Delete(path, false);
+}
+
+bool CheckServiceProcessRunning(ServiceProcessType type) {
+  const FilePath path = GetServiceProcessLockFilePath(type);
+  return file_util::PathExists(path);
+}