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// Copyright 2014 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 "mojo/shell/dynamic_service_loader.h"
#include "base/callback_helpers.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/scoped_native_library.h"
#include "base/threading/simple_thread.h"
#include "mojo/shell/context.h"
#include "mojo/shell/keep_alive.h"
#include "mojo/shell/switches.h"
typedef MojoResult (*MojoMainFunction)(MojoHandle pipe);
namespace mojo {
namespace shell {
namespace {
std::string MakeSharedLibraryName(const std::string& file_name) {
#if defined(OS_WIN)
return file_name + ".dll";
#elif defined(OS_LINUX)
return "lib" + file_name + ".so";
#elif defined(OS_MACOSX)
return "lib" + file_name + ".dylib";
#else
NOTREACHED() << "dynamic loading of services not supported";
return std::string();
#endif
}
} // namespace
class DynamicServiceLoader::LoadContext
: public mojo::shell::Loader::Delegate,
public base::DelegateSimpleThread::Delegate {
public:
LoadContext(DynamicServiceLoader* loader,
const GURL& url,
ScopedShellHandle service_handle)
: thread_(this, "app_thread"),
loader_(loader),
url_(url),
service_handle_(service_handle.Pass()),
keep_alive_(loader->context_) {
GURL url_to_load;
if (url.SchemeIs("mojo")) {
std::string origin =
CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kOrigin);
std::string lib = MakeSharedLibraryName(url.ExtractFileName());
url_to_load = GURL(origin + "/" + lib);
} else {
url_to_load = url;
}
request_ = loader_->context_->loader()->Load(url_to_load, this);
}
virtual ~LoadContext() {
thread_.Join();
}
private:
// From Loader::Delegate.
virtual void DidCompleteLoad(const GURL& app_url,
const base::FilePath& app_path,
const std::string* mime_type) OVERRIDE {
app_path_ = app_path;
thread_.Start();
}
// From base::DelegateSimpleThread::Delegate.
virtual void Run() OVERRIDE {
base::ScopedClosureRunner app_deleter(
base::Bind(base::IgnoreResult(&base::DeleteFile), app_path_, false));
do {
std::string load_error;
base::ScopedNativeLibrary app_library(
base::LoadNativeLibrary(app_path_, &load_error));
if (!app_library.is_valid()) {
LOG(ERROR) << "Failed to load library: " << app_path_.value() << " ("
<< url_.spec() << ")";
LOG(ERROR) << "error: " << load_error;
break;
}
MojoMainFunction main_function = reinterpret_cast<MojoMainFunction>(
app_library.GetFunctionPointer("MojoMain"));
if (!main_function) {
LOG(ERROR) << "Entrypoint MojoMain not found.";
break;
}
// |MojoMain()| takes ownership of the service handle.
// TODO(darin): What if MojoMain does not close the service handle?
MojoResult result = main_function(service_handle_.release().value());
if (result < MOJO_RESULT_OK)
LOG(ERROR) << "MojoMain returned an error: " << result;
} while (false);
loader_->context_->task_runners()->ui_runner()->PostTask(
FROM_HERE,
base::Bind(&LoadContext::AppCompleted, base::Unretained(this)));
}
void AppCompleted() {
loader_->AppCompleted(url_);
}
base::DelegateSimpleThread thread_;
DynamicServiceLoader* loader_;
GURL url_;
base::FilePath app_path_;
scoped_ptr<mojo::shell::Loader::Job> request_;
ScopedShellHandle service_handle_;
KeepAlive keep_alive_;
};
DynamicServiceLoader::DynamicServiceLoader(Context* context)
: context_(context) {
}
DynamicServiceLoader::~DynamicServiceLoader() {
DCHECK(url_to_load_context_.empty());
}
void DynamicServiceLoader::Load(const GURL& url,
ScopedShellHandle service_handle) {
DCHECK(url_to_load_context_.find(url) == url_to_load_context_.end());
url_to_load_context_[url] = new LoadContext(this, url, service_handle.Pass());
}
void DynamicServiceLoader::AppCompleted(const GURL& url) {
LoadContextMap::iterator it = url_to_load_context_.find(url);
DCHECK(it != url_to_load_context_.end());
LoadContext* doomed = it->second;
url_to_load_context_.erase(it);
delete doomed;
}
} // namespace shell
} // namespace mojo
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