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// Copyright (c) 2012 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 "chromeos/cryptohome/async_method_caller.h"
#include "base/bind.h"
#include "base/hash_tables.h"
#include "base/location.h"
#include "base/message_loop_proxy.h"
#include "chromeos/dbus/cryptohome_client.h"
#include "chromeos/dbus/dbus_thread_manager.h"
using chromeos::DBusThreadManager;
namespace cryptohome {
namespace {
AsyncMethodCaller* g_async_method_caller = NULL;
// The implementation of AsyncMethodCaller
class AsyncMethodCallerImpl : public AsyncMethodCaller {
public:
AsyncMethodCallerImpl() : weak_ptr_factory_(this) {
DBusThreadManager::Get()->GetCryptohomeClient()->SetAsyncCallStatusHandler(
base::Bind(&AsyncMethodCallerImpl::HandleAsyncResponse,
weak_ptr_factory_.GetWeakPtr()));
}
virtual ~AsyncMethodCallerImpl() {
DBusThreadManager::Get()->GetCryptohomeClient()->
ResetAsyncCallStatusHandler();
}
virtual void AsyncCheckKey(const std::string& user_email,
const std::string& passhash,
Callback callback) OVERRIDE {
DBusThreadManager::Get()->GetCryptohomeClient()->
AsyncCheckKey(user_email, passhash, base::Bind(
&AsyncMethodCallerImpl::RegisterAsyncCallback,
weak_ptr_factory_.GetWeakPtr(),
callback,
"Couldn't initiate async check of user's key."));
}
virtual void AsyncMigrateKey(const std::string& user_email,
const std::string& old_hash,
const std::string& new_hash,
Callback callback) OVERRIDE {
DBusThreadManager::Get()->GetCryptohomeClient()->
AsyncMigrateKey(user_email, old_hash, new_hash, base::Bind(
&AsyncMethodCallerImpl::RegisterAsyncCallback,
weak_ptr_factory_.GetWeakPtr(),
callback,
"Couldn't initiate aync migration of user's key"));
}
virtual void AsyncMount(const std::string& user_email,
const std::string& passhash,
const bool create_if_missing,
Callback callback) OVERRIDE {
DBusThreadManager::Get()->GetCryptohomeClient()->
AsyncMount(user_email, passhash, create_if_missing, base::Bind(
&AsyncMethodCallerImpl::RegisterAsyncCallback,
weak_ptr_factory_.GetWeakPtr(),
callback,
"Couldn't initiate async mount of cryptohome."));
}
virtual void AsyncMountGuest(Callback callback) OVERRIDE {
DBusThreadManager::Get()->GetCryptohomeClient()->
AsyncMountGuest(base::Bind(
&AsyncMethodCallerImpl::RegisterAsyncCallback,
weak_ptr_factory_.GetWeakPtr(),
callback,
"Couldn't initiate async mount of cryptohome."));
}
virtual void AsyncRemove(const std::string& user_email,
Callback callback) OVERRIDE {
DBusThreadManager::Get()->GetCryptohomeClient()->
AsyncRemove(user_email, base::Bind(
&AsyncMethodCallerImpl::RegisterAsyncCallback,
weak_ptr_factory_.GetWeakPtr(),
callback,
"Couldn't initiate async removal of cryptohome."));
}
private:
struct CallbackElement {
CallbackElement() {}
explicit CallbackElement(
const AsyncMethodCaller::Callback& callback)
: callback(callback),
proxy(base::MessageLoopProxy::current()) {
}
AsyncMethodCaller::Callback callback;
scoped_refptr<base::MessageLoopProxy> proxy;
};
typedef base::hash_map<int, CallbackElement> CallbackMap;
// Hanldes the response for async calls.
// Below is described how async calls work.
// 1. CryptohomeClient::AsyncXXX returns "async ID".
// 2. RegisterAsyncCallback registers the "async ID" with the user-provided
// callback.
// 3. Cryptohome will return the result asynchronously as a signal with
// "async ID"
// 4. "HandleAsyncResponse" handles the result signal and call the registered
// callback associated with the "async ID".
void HandleAsyncResponse(int async_id, bool return_status, int return_code) {
const CallbackMap::iterator it = callback_map_.find(async_id);
if (it == callback_map_.end()) {
LOG(ERROR) << "Received signal for unknown async_id " << async_id;
return;
}
it->second.proxy->PostTask(FROM_HERE,
base::Bind(it->second.callback,
return_status,
static_cast<MountError>(return_code)));
callback_map_.erase(it);
}
// Registers a callback which is called when the result for AsyncXXX is ready.
void RegisterAsyncCallback(
Callback callback, const char* error, int async_id) {
if (async_id == 0) {
LOG(ERROR) << error;
return;
}
VLOG(1) << "Adding handler for " << async_id;
DCHECK_EQ(callback_map_.count(async_id), 0U);
callback_map_[async_id] = CallbackElement(callback);
}
base::WeakPtrFactory<AsyncMethodCallerImpl> weak_ptr_factory_;
CallbackMap callback_map_;
DISALLOW_COPY_AND_ASSIGN(AsyncMethodCallerImpl);
};
} // namespace
// static
void AsyncMethodCaller::Initialize() {
if (g_async_method_caller) {
LOG(WARNING) << "AsyncMethodCaller was already initialized";
return;
}
g_async_method_caller = new AsyncMethodCallerImpl();
VLOG(1) << "AsyncMethodCaller initialized";
}
// static
void AsyncMethodCaller::InitializeForTesting(
AsyncMethodCaller* async_method_caller) {
if (g_async_method_caller) {
LOG(WARNING) << "AsyncMethodCaller was already initialized";
return;
}
g_async_method_caller = async_method_caller;
VLOG(1) << "AsyncMethodCaller initialized";
}
// static
void AsyncMethodCaller::Shutdown() {
if (!g_async_method_caller) {
LOG(WARNING) << "AsyncMethodCaller::Shutdown() called with NULL manager";
return;
}
delete g_async_method_caller;
g_async_method_caller = NULL;
VLOG(1) << "AsyncMethodCaller Shutdown completed";
}
// static
AsyncMethodCaller* AsyncMethodCaller::GetInstance() {
return g_async_method_caller;
}
} // namespace cryptohome
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