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// Copyright (c) 2011 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 "dbus/bus.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/threading/thread.h"
#include "base/threading/thread_restrictions.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "dbus/scoped_dbus_error.h"
namespace dbus {
ObjectProxy::ObjectProxy(Bus* bus,
const std::string& service_name,
const std::string& object_path)
: bus_(bus),
service_name_(service_name),
object_path_(object_path) {
}
ObjectProxy::~ObjectProxy() {
}
// Originally we tried to make |method_call| a const reference, but we
// gave up as dbus_connection_send_with_reply_and_block() takes a
// non-const pointer of DBusMessage as the second parameter.
bool ObjectProxy::CallMethodAndBlock(MethodCall* method_call,
int timeout_ms,
Response* response) {
bus_->AssertOnDBusThread();
if (!bus_->Connect())
return false;
method_call->SetDestination(service_name_);
method_call->SetPath(object_path_);
DBusMessage* request_message = method_call->raw_message();
ScopedDBusError error;
// Send the message synchronously.
DBusMessage* response_message =
bus_->SendWithReplyAndBlock(request_message, timeout_ms, error.get());
if (!response_message) {
LOG(ERROR) << "Failed to call method: "
<< (error.is_set() ? error.message() : "");
return false;
}
response->reset_raw_message(response_message);
return true;
}
void ObjectProxy::CallMethod(MethodCall* method_call,
int timeout_ms,
ResponseCallback callback) {
bus_->AssertOnOriginThread();
method_call->SetDestination(service_name_);
method_call->SetPath(object_path_);
// Increment the reference count so we can safely reference the
// underlying request message until the method call is complete. This
// will be unref'ed in StartAsyncMethodCall().
DBusMessage* request_message = method_call->raw_message();
dbus_message_ref(request_message);
// Bind() won't compile if we pass request_message as-is since
// DBusMessage is an opaque struct which Bind() cannot handle.
// Hence we cast it to void* to workaround the issue.
base::Closure task = base::Bind(&ObjectProxy::StartAsyncMethodCall,
this,
timeout_ms,
static_cast<void*>(request_message),
callback);
// Wait for the response in the D-Bus thread.
bus_->PostTaskToDBusThread(FROM_HERE, task);
}
ObjectProxy::OnPendingCallIsCompleteData::OnPendingCallIsCompleteData(
ObjectProxy* in_object_proxy,
ResponseCallback in_response_callback)
: object_proxy(in_object_proxy),
response_callback(in_response_callback) {
}
ObjectProxy::OnPendingCallIsCompleteData::~OnPendingCallIsCompleteData() {
}
void ObjectProxy::StartAsyncMethodCall(int timeout_ms,
void* in_request_message,
ResponseCallback response_callback) {
bus_->AssertOnDBusThread();
if (!bus_->Connect() || !bus_->SetUpAsyncOperations()) {
// In case of a failure, run the callback with NULL response, that
// indicates a failure.
Response* response = NULL;
base::Closure task = base::Bind(&ObjectProxy::RunResponseCallback,
this,
response_callback,
response);
bus_->PostTaskToOriginThread(FROM_HERE, task);
return;
}
DBusMessage* request_message =
static_cast<DBusMessage*>(in_request_message);
DBusPendingCall* pending_call = NULL;
bus_->SendWithReply(request_message, &pending_call, timeout_ms);
// Prepare the data we'll be passing to OnPendingCallIsCompleteThunk().
// The data will be deleted in OnPendingCallIsCompleteThunk().
OnPendingCallIsCompleteData* data =
new OnPendingCallIsCompleteData(this, response_callback);
// This returns false only when unable to allocate memory.
const bool success = dbus_pending_call_set_notify(
pending_call,
&ObjectProxy::OnPendingCallIsCompleteThunk,
data,
NULL);
CHECK(success) << "Unable to allocate memory";
dbus_pending_call_unref(pending_call);
// It's now safe to unref the request message.
dbus_message_unref(request_message);
}
void ObjectProxy::OnPendingCallIsComplete(DBusPendingCall* pending_call,
ResponseCallback response_callback) {
bus_->AssertOnDBusThread();
DBusMessage* response_message = dbus_pending_call_steal_reply(pending_call);
if (!response_message) {
// This shouldn't happen but just in case.
LOG(ERROR) << "The response message is not received for some reason";
Response* response = NULL;
base::Closure task = base::Bind(&ObjectProxy::RunResponseCallback,
this,
response_callback,
response);
bus_->PostTaskToOriginThread(FROM_HERE, task);
return;
}
// The response message will be deleted in RunResponseCallback().
Response* response = new Response;
response->reset_raw_message(response_message);
base::Closure task = base::Bind(&ObjectProxy::RunResponseCallback,
this,
response_callback,
response);
bus_->PostTaskToOriginThread(FROM_HERE, task);
}
void ObjectProxy::RunResponseCallback(ResponseCallback response_callback,
Response* response) {
bus_->AssertOnOriginThread();
if (!response) {
// The response is not received.
response_callback.Run(NULL);
} else if (response->GetMessageType() == Message::MESSAGE_ERROR) {
// Error message may contain the error message as string.
dbus::MessageReader reader(response);
std::string error_message;
reader.PopString(&error_message);
LOG(ERROR) << "Failed to call method: " << response->GetErrorName()
<< ": " << error_message;
// We don't give the error message to the callback.
response_callback.Run(NULL);
} else {
// The response is successfuly received.
response_callback.Run(response);
}
delete response; // It's ok to delete NULL.
}
void ObjectProxy::OnPendingCallIsCompleteThunk(DBusPendingCall* pending_call,
void* user_data) {
OnPendingCallIsCompleteData* data =
reinterpret_cast<OnPendingCallIsCompleteData*>(user_data);
ObjectProxy* self = data->object_proxy;
self->OnPendingCallIsComplete(pending_call,
data->response_callback);
delete data;
}
} // namespace dbus
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