| // 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 "dbus/object_proxy.h" |
| |
| #include <stddef.h> |
| #include <utility> |
| |
| #include "base/bind.h" |
| #include "base/logging.h" |
| #include "base/message_loop/message_loop.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/strings/string_piece.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/task_runner_util.h" |
| #include "base/threading/thread.h" |
| #include "base/threading/thread_restrictions.h" |
| #include "dbus/bus.h" |
| #include "dbus/dbus_statistics.h" |
| #include "dbus/message.h" |
| #include "dbus/object_path.h" |
| #include "dbus/scoped_dbus_error.h" |
| #include "dbus/util.h" |
| |
| namespace dbus { |
| |
| namespace { |
| |
| const char kErrorServiceUnknown[] = "org.freedesktop.DBus.Error.ServiceUnknown"; |
| const char kErrorObjectUnknown[] = "org.freedesktop.DBus.Error.UnknownObject"; |
| |
| // Used for success ratio histograms. 1 for success, 0 for failure. |
| const int kSuccessRatioHistogramMaxValue = 2; |
| |
| // The path of D-Bus Object sending NameOwnerChanged signal. |
| const char kDBusSystemObjectPath[] = "/org/freedesktop/DBus"; |
| |
| // The D-Bus Object interface. |
| const char kDBusSystemObjectInterface[] = "org.freedesktop.DBus"; |
| |
| // The D-Bus Object address. |
| const char kDBusSystemObjectAddress[] = "org.freedesktop.DBus"; |
| |
| // The NameOwnerChanged member in |kDBusSystemObjectInterface|. |
| const char kNameOwnerChangedMember[] = "NameOwnerChanged"; |
| |
| // An empty function used for ObjectProxy::EmptyResponseCallback(). |
| void EmptyResponseCallbackBody(Response* /*response*/) { |
| } |
| |
| } // namespace |
| |
| ObjectProxy::ObjectProxy(Bus* bus, |
| const std::string& service_name, |
| const ObjectPath& object_path, |
| int options) |
| : bus_(bus), |
| service_name_(service_name), |
| object_path_(object_path), |
| ignore_service_unknown_errors_( |
| options & IGNORE_SERVICE_UNKNOWN_ERRORS) { |
| } |
| |
| ObjectProxy::~ObjectProxy() { |
| DCHECK(pending_calls_.empty()); |
| } |
| |
| // 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. |
| std::unique_ptr<Response> ObjectProxy::CallMethodAndBlockWithErrorDetails( |
| MethodCall* method_call, |
| int timeout_ms, |
| ScopedDBusError* error) { |
| bus_->AssertOnDBusThread(); |
| |
| if (!bus_->Connect() || |
| !method_call->SetDestination(service_name_) || |
| !method_call->SetPath(object_path_)) |
| return std::unique_ptr<Response>(); |
| |
| DBusMessage* request_message = method_call->raw_message(); |
| |
| // Send the message synchronously. |
| const base::TimeTicks start_time = base::TimeTicks::Now(); |
| DBusMessage* response_message = |
| bus_->SendWithReplyAndBlock(request_message, timeout_ms, error->get()); |
| // Record if the method call is successful, or not. 1 if successful. |
| UMA_HISTOGRAM_ENUMERATION("DBus.SyncMethodCallSuccess", |
| response_message ? 1 : 0, |
| kSuccessRatioHistogramMaxValue); |
| statistics::AddBlockingSentMethodCall(service_name_, |
| method_call->GetInterface(), |
| method_call->GetMember()); |
| |
| if (!response_message) { |
| LogMethodCallFailure(method_call->GetInterface(), |
| method_call->GetMember(), |
| error->is_set() ? error->name() : "unknown error type", |
| error->is_set() ? error->message() : ""); |
| return std::unique_ptr<Response>(); |
| } |
| // Record time spent for the method call. Don't include failures. |
| UMA_HISTOGRAM_TIMES("DBus.SyncMethodCallTime", |
| base::TimeTicks::Now() - start_time); |
| |
| return Response::FromRawMessage(response_message); |
| } |
| |
| std::unique_ptr<Response> ObjectProxy::CallMethodAndBlock( |
| MethodCall* method_call, |
| int timeout_ms) { |
| ScopedDBusError error; |
| return CallMethodAndBlockWithErrorDetails(method_call, timeout_ms, &error); |
| } |
| |
| void ObjectProxy::CallMethod(MethodCall* method_call, |
| int timeout_ms, |
| ResponseCallback callback) { |
| CallMethodInternalCallback internal_callback = base::BindOnce( |
| &ObjectProxy::OnCallMethod, this, method_call->GetInterface(), |
| method_call->GetMember(), std::move(callback)); |
| |
| CallMethodInternal(method_call, timeout_ms, std::move(internal_callback)); |
| } |
| |
| void ObjectProxy::CallMethodWithErrorCallback(MethodCall* method_call, |
| int timeout_ms, |
| ResponseCallback callback, |
| ErrorCallback error_callback) { |
| CallMethodInternalCallback internal_callback = base::BindOnce( |
| [](ResponseCallback callback, ErrorCallback error_callback, |
| Response* response, ErrorResponse* error_response) { |
| if (response) { |
| std::move(callback).Run(response); |
| } else { |
| std::move(error_callback).Run(error_response); |
| } |
| }, |
| std::move(callback), std::move(error_callback)); |
| |
| CallMethodInternal(method_call, timeout_ms, std::move(internal_callback)); |
| } |
| |
| void ObjectProxy::CallMethodInternal(MethodCall* method_call, |
| int timeout_ms, |
| CallMethodInternalCallback callback) { |
| bus_->AssertOnOriginThread(); |
| |
| const base::TimeTicks start_time = base::TimeTicks::Now(); |
| |
| if (!method_call->SetDestination(service_name_) || |
| !method_call->SetPath(object_path_)) { |
| // In case of a failure, run the error callback with nullptr. |
| base::OnceClosure task = base::BindOnce( |
| &ObjectProxy::RunCallMethodInternalCallback, this, std::move(callback), |
| start_time, nullptr /* response_message */); |
| bus_->GetOriginTaskRunner()->PostTask(FROM_HERE, std::move(task)); |
| return; |
| } |
| |
| // 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); |
| |
| statistics::AddSentMethodCall(service_name_, |
| method_call->GetInterface(), |
| method_call->GetMember()); |
| |
| // Wait for the response in the D-Bus thread. |
| base::OnceClosure task = |
| base::BindOnce(&ObjectProxy::StartAsyncMethodCall, this, timeout_ms, |
| request_message, std::move(callback), start_time); |
| bus_->GetDBusTaskRunner()->PostTask(FROM_HERE, std::move(task)); |
| } |
| |
| void ObjectProxy::ConnectToSignal(const std::string& interface_name, |
| const std::string& signal_name, |
| SignalCallback signal_callback, |
| OnConnectedCallback on_connected_callback) { |
| bus_->AssertOnOriginThread(); |
| |
| if (bus_->HasDBusThread()) { |
| base::PostTaskAndReplyWithResult( |
| bus_->GetDBusTaskRunner(), FROM_HERE, |
| base::Bind(&ObjectProxy::ConnectToSignalInternal, this, interface_name, |
| signal_name, signal_callback), |
| base::Bind(on_connected_callback, interface_name, signal_name)); |
| } else { |
| // If the bus doesn't have a dedicated dbus thread we need to call |
| // ConnectToSignalInternal directly otherwise we might miss a signal |
| // that is currently queued if we do a PostTask. |
| const bool success = |
| ConnectToSignalInternal(interface_name, signal_name, signal_callback); |
| on_connected_callback.Run(interface_name, signal_name, success); |
| } |
| } |
| |
| void ObjectProxy::SetNameOwnerChangedCallback( |
| NameOwnerChangedCallback callback) { |
| bus_->AssertOnOriginThread(); |
| |
| name_owner_changed_callback_ = callback; |
| } |
| |
| void ObjectProxy::WaitForServiceToBeAvailable( |
| WaitForServiceToBeAvailableCallback callback) { |
| bus_->AssertOnOriginThread(); |
| |
| wait_for_service_to_be_available_callbacks_.push_back(callback); |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ObjectProxy::WaitForServiceToBeAvailableInternal, this)); |
| } |
| |
| void ObjectProxy::Detach() { |
| bus_->AssertOnDBusThread(); |
| |
| if (bus_->is_connected()) |
| bus_->RemoveFilterFunction(&ObjectProxy::HandleMessageThunk, this); |
| |
| for (const auto& match_rule : match_rules_) { |
| ScopedDBusError error; |
| bus_->RemoveMatch(match_rule, error.get()); |
| if (error.is_set()) { |
| // There is nothing we can do to recover, so just print the error. |
| LOG(ERROR) << "Failed to remove match rule: " << match_rule; |
| } |
| } |
| match_rules_.clear(); |
| |
| for (auto* pending_call : pending_calls_) { |
| dbus_pending_call_cancel(pending_call); |
| dbus_pending_call_unref(pending_call); |
| } |
| pending_calls_.clear(); |
| } |
| |
| // static |
| ObjectProxy::ResponseCallback ObjectProxy::EmptyResponseCallback() { |
| return base::Bind(&EmptyResponseCallbackBody); |
| } |
| |
| ObjectProxy::OnPendingCallIsCompleteData::OnPendingCallIsCompleteData( |
| ObjectProxy* in_object_proxy, |
| CallMethodInternalCallback in_callback, |
| base::TimeTicks in_start_time) |
| : object_proxy(in_object_proxy), |
| callback(std::move(in_callback)), |
| start_time(in_start_time) {} |
| |
| ObjectProxy::OnPendingCallIsCompleteData::~OnPendingCallIsCompleteData() = |
| default; |
| |
| void ObjectProxy::StartAsyncMethodCall(int timeout_ms, |
| DBusMessage* request_message, |
| CallMethodInternalCallback callback, |
| base::TimeTicks start_time) { |
| bus_->AssertOnDBusThread(); |
| |
| if (!bus_->Connect() || !bus_->SetUpAsyncOperations()) { |
| // In case of a failure, run the error callback with nullptr. |
| base::OnceClosure task = base::BindOnce( |
| &ObjectProxy::RunCallMethodInternalCallback, this, std::move(callback), |
| start_time, nullptr /* response_message */); |
| bus_->GetOriginTaskRunner()->PostTask(FROM_HERE, std::move(task)); |
| |
| dbus_message_unref(request_message); |
| return; |
| } |
| |
| DBusPendingCall* pending_call = nullptr; |
| 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, std::move(callback), start_time); |
| |
| // This returns false only when unable to allocate memory. |
| const bool success = dbus_pending_call_set_notify( |
| pending_call, |
| &ObjectProxy::OnPendingCallIsCompleteThunk, |
| data, |
| &DeleteVoidPointer<OnPendingCallIsCompleteData>); |
| CHECK(success) << "Unable to allocate memory"; |
| pending_calls_.insert(pending_call); |
| |
| // It's now safe to unref the request message. |
| dbus_message_unref(request_message); |
| } |
| |
| void ObjectProxy::OnPendingCallIsComplete(DBusPendingCall* pending_call, |
| CallMethodInternalCallback callback, |
| base::TimeTicks start_time) { |
| bus_->AssertOnDBusThread(); |
| |
| DBusMessage* response_message = dbus_pending_call_steal_reply(pending_call); |
| base::OnceClosure task = |
| base::BindOnce(&ObjectProxy::RunCallMethodInternalCallback, this, |
| std::move(callback), start_time, response_message); |
| bus_->GetOriginTaskRunner()->PostTask(FROM_HERE, std::move(task)); |
| |
| // Remove the pending call from the set. |
| pending_calls_.erase(pending_call); |
| dbus_pending_call_unref(pending_call); |
| } |
| |
| void ObjectProxy::RunCallMethodInternalCallback( |
| CallMethodInternalCallback callback, |
| base::TimeTicks start_time, |
| DBusMessage* response_message) { |
| bus_->AssertOnOriginThread(); |
| |
| bool method_call_successful = false; |
| if (!response_message) { |
| // The response is not received. |
| std::move(callback).Run(nullptr, nullptr); |
| } else if (dbus_message_get_type(response_message) == |
| DBUS_MESSAGE_TYPE_ERROR) { |
| // This will take |response_message| and release (unref) it. |
| std::unique_ptr<ErrorResponse> error_response( |
| ErrorResponse::FromRawMessage(response_message)); |
| std::move(callback).Run(nullptr, error_response.get()); |
| // Delete the message on the D-Bus thread. See below for why. |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&base::DeletePointer<ErrorResponse>, |
| error_response.release())); |
| } else { |
| // This will take |response_message| and release (unref) it. |
| std::unique_ptr<Response> response( |
| Response::FromRawMessage(response_message)); |
| // The response is successfully received. |
| std::move(callback).Run(response.get(), nullptr); |
| // The message should be deleted on the D-Bus thread for a complicated |
| // reason: |
| // |
| // libdbus keeps track of the number of bytes in the incoming message |
| // queue to ensure that the data size in the queue is manageable. The |
| // bookkeeping is partly done via dbus_message_unref(), and immediately |
| // asks the client code (Chrome) to stop monitoring the underlying |
| // socket, if the number of bytes exceeds a certian number, which is set |
| // to 63MB, per dbus-transport.cc: |
| // |
| // /* Try to default to something that won't totally hose the system, |
| // * but doesn't impose too much of a limitation. |
| // */ |
| // transport->max_live_messages_size = _DBUS_ONE_MEGABYTE * 63; |
| // |
| // The monitoring of the socket is done on the D-Bus thread (see Watch |
| // class in bus.cc), hence we should stop the monitoring from D-Bus |
| // thread, not from the current thread here, which is likely UI thread. |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&base::DeletePointer<Response>, response.release())); |
| |
| method_call_successful = true; |
| // Record time spent for the method call. Don't include failures. |
| UMA_HISTOGRAM_TIMES("DBus.AsyncMethodCallTime", |
| base::TimeTicks::Now() - start_time); |
| } |
| // Record if the method call is successful, or not. 1 if successful. |
| UMA_HISTOGRAM_ENUMERATION("DBus.AsyncMethodCallSuccess", |
| method_call_successful, |
| kSuccessRatioHistogramMaxValue); |
| } |
| |
| 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, std::move(data->callback), |
| data->start_time); |
| } |
| |
| bool ObjectProxy::ConnectToNameOwnerChangedSignal() { |
| bus_->AssertOnDBusThread(); |
| |
| if (!bus_->Connect() || !bus_->SetUpAsyncOperations()) |
| return false; |
| |
| bus_->AddFilterFunction(&ObjectProxy::HandleMessageThunk, this); |
| |
| // Add a match_rule listening NameOwnerChanged for the well-known name |
| // |service_name_|. |
| const std::string name_owner_changed_match_rule = |
| base::StringPrintf( |
| "type='signal',interface='org.freedesktop.DBus'," |
| "member='NameOwnerChanged',path='/org/freedesktop/DBus'," |
| "sender='org.freedesktop.DBus',arg0='%s'", |
| service_name_.c_str()); |
| |
| const bool success = |
| AddMatchRuleWithoutCallback(name_owner_changed_match_rule, |
| "org.freedesktop.DBus.NameOwnerChanged"); |
| |
| // Try getting the current name owner. It's not guaranteed that we can get |
| // the name owner at this moment, as the service may not yet be started. If |
| // that's the case, we'll get the name owner via NameOwnerChanged signal, |
| // as soon as the service is started. |
| UpdateNameOwnerAndBlock(); |
| |
| return success; |
| } |
| |
| bool ObjectProxy::ConnectToSignalInternal(const std::string& interface_name, |
| const std::string& signal_name, |
| SignalCallback signal_callback) { |
| bus_->AssertOnDBusThread(); |
| |
| if (!ConnectToNameOwnerChangedSignal()) |
| return false; |
| |
| const std::string absolute_signal_name = |
| GetAbsoluteMemberName(interface_name, signal_name); |
| |
| // Add a match rule so the signal goes through HandleMessage(). |
| const std::string match_rule = |
| base::StringPrintf("type='signal', interface='%s', path='%s'", |
| interface_name.c_str(), |
| object_path_.value().c_str()); |
| return AddMatchRuleWithCallback(match_rule, |
| absolute_signal_name, |
| signal_callback); |
| } |
| |
| void ObjectProxy::WaitForServiceToBeAvailableInternal() { |
| bus_->AssertOnDBusThread(); |
| |
| if (!ConnectToNameOwnerChangedSignal()) { // Failed to connect to the signal. |
| const bool service_is_ready = false; |
| bus_->GetOriginTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ObjectProxy::RunWaitForServiceToBeAvailableCallbacks, |
| this, service_is_ready)); |
| return; |
| } |
| |
| const bool service_is_available = !service_name_owner_.empty(); |
| if (service_is_available) { // Service is already available. |
| bus_->GetOriginTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ObjectProxy::RunWaitForServiceToBeAvailableCallbacks, |
| this, service_is_available)); |
| return; |
| } |
| } |
| |
| DBusHandlerResult ObjectProxy::HandleMessage( |
| DBusConnection* connection, |
| DBusMessage* raw_message) { |
| bus_->AssertOnDBusThread(); |
| |
| if (dbus_message_get_type(raw_message) != DBUS_MESSAGE_TYPE_SIGNAL) |
| return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
| |
| // raw_message will be unrefed on exit of the function. Increment the |
| // reference so we can use it in Signal. |
| dbus_message_ref(raw_message); |
| std::unique_ptr<Signal> signal(Signal::FromRawMessage(raw_message)); |
| |
| // Verify the signal comes from the object we're proxying for, this is |
| // our last chance to return DBUS_HANDLER_RESULT_NOT_YET_HANDLED and |
| // allow other object proxies to handle instead. |
| const ObjectPath path = signal->GetPath(); |
| if (path != object_path_) { |
| if (path.value() == kDBusSystemObjectPath && |
| signal->GetMember() == kNameOwnerChangedMember) { |
| // Handle NameOwnerChanged separately |
| return HandleNameOwnerChanged(std::move(signal)); |
| } |
| return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
| } |
| |
| const std::string interface = signal->GetInterface(); |
| const std::string member = signal->GetMember(); |
| |
| statistics::AddReceivedSignal(service_name_, interface, member); |
| |
| // Check if we know about the signal. |
| const std::string absolute_signal_name = GetAbsoluteMemberName( |
| interface, member); |
| MethodTable::const_iterator iter = method_table_.find(absolute_signal_name); |
| if (iter == method_table_.end()) { |
| // Don't know about the signal. |
| return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
| } |
| VLOG(1) << "Signal received: " << signal->ToString(); |
| |
| std::string sender = signal->GetSender(); |
| if (service_name_owner_ != sender) { |
| LOG(ERROR) << "Rejecting a message from a wrong sender."; |
| return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
| } |
| |
| const base::TimeTicks start_time = base::TimeTicks::Now(); |
| if (bus_->HasDBusThread()) { |
| // Post a task to run the method in the origin thread. |
| // Transfer the ownership of |signal| to RunMethod(). |
| // |released_signal| will be deleted in RunMethod(). |
| Signal* released_signal = signal.release(); |
| bus_->GetOriginTaskRunner()->PostTask(FROM_HERE, |
| base::Bind(&ObjectProxy::RunMethod, |
| this, |
| start_time, |
| iter->second, |
| released_signal)); |
| } else { |
| const base::TimeTicks start_time = base::TimeTicks::Now(); |
| // If the D-Bus thread is not used, just call the callback on the |
| // current thread. Transfer the ownership of |signal| to RunMethod(). |
| Signal* released_signal = signal.release(); |
| RunMethod(start_time, iter->second, released_signal); |
| } |
| |
| // We don't return DBUS_HANDLER_RESULT_HANDLED for signals because other |
| // objects may be interested in them. (e.g. Signals from org.freedesktop.DBus) |
| return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
| } |
| |
| void ObjectProxy::RunMethod(base::TimeTicks start_time, |
| std::vector<SignalCallback> signal_callbacks, |
| Signal* signal) { |
| bus_->AssertOnOriginThread(); |
| |
| for (std::vector<SignalCallback>::iterator iter = signal_callbacks.begin(); |
| iter != signal_callbacks.end(); ++iter) |
| iter->Run(signal); |
| |
| // Delete the message on the D-Bus thread. See comments in |
| // RunCallMethodInternalCallback(). |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&base::DeletePointer<Signal>, signal)); |
| |
| // Record time spent for handling the signal. |
| UMA_HISTOGRAM_TIMES("DBus.SignalHandleTime", |
| base::TimeTicks::Now() - start_time); |
| } |
| |
| DBusHandlerResult ObjectProxy::HandleMessageThunk( |
| DBusConnection* connection, |
| DBusMessage* raw_message, |
| void* user_data) { |
| ObjectProxy* self = reinterpret_cast<ObjectProxy*>(user_data); |
| return self->HandleMessage(connection, raw_message); |
| } |
| |
| void ObjectProxy::LogMethodCallFailure( |
| const base::StringPiece& interface_name, |
| const base::StringPiece& method_name, |
| const base::StringPiece& error_name, |
| const base::StringPiece& error_message) const { |
| if (ignore_service_unknown_errors_ && |
| (error_name == kErrorServiceUnknown || error_name == kErrorObjectUnknown)) |
| return; |
| |
| std::ostringstream msg; |
| msg << "Failed to call method: " << interface_name << "." << method_name |
| << ": object_path= " << object_path_.value() |
| << ": " << error_name << ": " << error_message; |
| |
| // "UnknownObject" indicates that an object or service is no longer available, |
| // e.g. a Shill network service has gone out of range. Treat these as warnings |
| // not errors. |
| if (error_name == kErrorObjectUnknown) |
| LOG(WARNING) << msg.str(); |
| else |
| LOG(ERROR) << msg.str(); |
| } |
| |
| void ObjectProxy::OnCallMethod(const std::string& interface_name, |
| const std::string& method_name, |
| ResponseCallback response_callback, |
| Response* response, |
| ErrorResponse* error_response) { |
| if (response) { |
| // Method call was successful. |
| std::move(response_callback).Run(response); |
| return; |
| } |
| // Method call failed. |
| std::string error_name; |
| std::string error_message; |
| if (error_response) { |
| // Error message may contain the error message as string. |
| error_name = error_response->GetErrorName(); |
| MessageReader reader(error_response); |
| reader.PopString(&error_message); |
| } else { |
| error_name = "unknown error type"; |
| } |
| LogMethodCallFailure(interface_name, method_name, error_name, error_message); |
| |
| std::move(response_callback).Run(nullptr); |
| } |
| |
| bool ObjectProxy::AddMatchRuleWithCallback( |
| const std::string& match_rule, |
| const std::string& absolute_signal_name, |
| SignalCallback signal_callback) { |
| DCHECK(!match_rule.empty()); |
| DCHECK(!absolute_signal_name.empty()); |
| bus_->AssertOnDBusThread(); |
| |
| if (match_rules_.find(match_rule) == match_rules_.end()) { |
| ScopedDBusError error; |
| bus_->AddMatch(match_rule, error.get()); |
| if (error.is_set()) { |
| LOG(ERROR) << "Failed to add match rule \"" << match_rule << "\". Got " |
| << error.name() << ": " << error.message(); |
| return false; |
| } else { |
| // Store the match rule, so that we can remove this in Detach(). |
| match_rules_.insert(match_rule); |
| // Add the signal callback to the method table. |
| method_table_[absolute_signal_name].push_back(signal_callback); |
| return true; |
| } |
| } else { |
| // We already have the match rule. |
| method_table_[absolute_signal_name].push_back(signal_callback); |
| return true; |
| } |
| } |
| |
| bool ObjectProxy::AddMatchRuleWithoutCallback( |
| const std::string& match_rule, |
| const std::string& absolute_signal_name) { |
| DCHECK(!match_rule.empty()); |
| DCHECK(!absolute_signal_name.empty()); |
| bus_->AssertOnDBusThread(); |
| |
| if (match_rules_.find(match_rule) != match_rules_.end()) |
| return true; |
| |
| ScopedDBusError error; |
| bus_->AddMatch(match_rule, error.get()); |
| if (error.is_set()) { |
| LOG(ERROR) << "Failed to add match rule \"" << match_rule << "\". Got " |
| << error.name() << ": " << error.message(); |
| return false; |
| } |
| // Store the match rule, so that we can remove this in Detach(). |
| match_rules_.insert(match_rule); |
| return true; |
| } |
| |
| void ObjectProxy::UpdateNameOwnerAndBlock() { |
| bus_->AssertOnDBusThread(); |
| // Errors should be suppressed here, as the service may not be yet running |
| // when connecting to signals of the service, which is just fine. |
| // The ObjectProxy will be notified when the service is launched via |
| // NameOwnerChanged signal. See also comments in ConnectToSignalInternal(). |
| service_name_owner_ = |
| bus_->GetServiceOwnerAndBlock(service_name_, Bus::SUPPRESS_ERRORS); |
| } |
| |
| DBusHandlerResult ObjectProxy::HandleNameOwnerChanged( |
| std::unique_ptr<Signal> signal) { |
| DCHECK(signal); |
| bus_->AssertOnDBusThread(); |
| |
| // Confirm the validity of the NameOwnerChanged signal. |
| if (signal->GetMember() == kNameOwnerChangedMember && |
| signal->GetInterface() == kDBusSystemObjectInterface && |
| signal->GetSender() == kDBusSystemObjectAddress) { |
| MessageReader reader(signal.get()); |
| std::string name, old_owner, new_owner; |
| if (reader.PopString(&name) && |
| reader.PopString(&old_owner) && |
| reader.PopString(&new_owner) && |
| name == service_name_) { |
| service_name_owner_ = new_owner; |
| bus_->GetOriginTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ObjectProxy::RunNameOwnerChangedCallback, |
| this, old_owner, new_owner)); |
| |
| const bool service_is_available = !service_name_owner_.empty(); |
| if (service_is_available) { |
| bus_->GetOriginTaskRunner()->PostTask( |
| FROM_HERE, |
| base::Bind(&ObjectProxy::RunWaitForServiceToBeAvailableCallbacks, |
| this, service_is_available)); |
| } |
| } |
| } |
| |
| // Always return unhandled to let other object proxies handle the same |
| // signal. |
| return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
| } |
| |
| void ObjectProxy::RunNameOwnerChangedCallback(const std::string& old_owner, |
| const std::string& new_owner) { |
| bus_->AssertOnOriginThread(); |
| if (!name_owner_changed_callback_.is_null()) |
| name_owner_changed_callback_.Run(old_owner, new_owner); |
| } |
| |
| void ObjectProxy::RunWaitForServiceToBeAvailableCallbacks( |
| bool service_is_available) { |
| bus_->AssertOnOriginThread(); |
| |
| std::vector<WaitForServiceToBeAvailableCallback> callbacks; |
| callbacks.swap(wait_for_service_to_be_available_callbacks_); |
| for (size_t i = 0; i < callbacks.size(); ++i) |
| callbacks[i].Run(service_is_available); |
| } |
| |
| } // namespace dbus |