Build services as standalone executables

services/service_manager/public/cpp/standalone_service/main.cc

+// Copyright 2016 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/at_exit.h"
+#include "base/base_paths.h"
+#include "base/command_line.h"
+#include "base/debug/stack_trace.h"
+#include "base/i18n/icu_util.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/path_service.h"
+#include "base/process/launch.h"
+#include "services/service_manager/public/c/main.h"
+#include "services/service_manager/public/cpp/standalone_service/standalone_service.h"
+#include "services/service_manager/public/cpp/standalone_service/switches.h"
+#include "services/service_manager/public/interfaces/service.mojom.h"
+#include "services/service_manager/runner/init.h"
+
+#if defined(OS_MACOSX)
+#include "base/mac/bundle_locations.h"
+#endif
+
+namespace {
+
+// Cross-platform helper to override the necessary hard-coded path location
+// used to load ICU data.
+//
+// TODO(rockot): We should just parameterize InitializeICU so hacks like
+// this are unnecessary.
+class ScopedIcuDataDirOverride {
+ public:
+  ScopedIcuDataDirOverride(const base::FilePath& path) {
+#if defined(OS_WIN)
+    base::PathService::Get(base::DIR_MODULE, &original_path_);
+#elif defined(OS_MACOSX)
+    original_path_= base::mac::FrameworkBundlePath();
+#else
+    base::PathService::Get(base::DIR_EXE, &original_path_);
+#endif
+
+    if (!path.empty())
+      SetPathOverride(path);
+  }
+
+  ~ScopedIcuDataDirOverride() { SetPathOverride(original_path_); }
+
+ private:
+  static void SetPathOverride(const base::FilePath& path) {
+#if defined(OS_WIN)
+    base::PathService::Override(base::DIR_MODULE, path);
+#elif defined(OS_MACOSX)
+    base::mac::SetOverrideFrameworkBundlePath(path);
+#else
+    base::PathService::Override(base::DIR_EXE, path);
+#endif
+  }
+
+  base::FilePath original_path_;
+};
+
+// TODO(rockot): We should consider removing ServiceMain and instead allowing
+// service sources to define a CreateService method which returns a new instance
+// of service_manager::Service. This would reduce boilerplate in service sources
+// since they all effectively do the same thing via
+// service_manager::ServiceRunner.
+void RunServiceMain(service_manager::mojom::ServiceRequest request) {
+  MojoResult result = ServiceMain(request.PassMessagePipe().release().value());
+  DCHECK_EQ(result, MOJO_RESULT_OK);
+}
+
+}  // namespace
+
+int main(int argc, char** argv) {
+  base::AtExitManager at_exit;
+  base::CommandLine::Init(argc, argv);
+
+#if !defined(OFFICIAL_BIULD) && defined(OS_WIN)
+  base::RouteStdioToConsole(false);
+#endif
+
+  service_manager::InitializeLogging();
+
+  {
+    base::FilePath icu_data_dir = base::CommandLine::ForCurrentProcess()
+        ->GetSwitchValuePath(service_manager::switches::kIcuDataDir);
+    ScopedIcuDataDirOverride path_override(icu_data_dir);
+    base::i18n::InitializeICU();
+  }
+
+  service_manager::WaitForDebuggerIfNecessary();
+
+  service_manager::RunStandaloneService(base::Bind(&RunServiceMain));
+  return 0;
+}