| // Copyright 2012 The Chromium Authors |
| // 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/containers/contains.h" |
| #include "base/debug/alias.h" |
| #include "base/debug/leak_annotations.h" |
| #include "base/functional/bind.h" |
| #include "base/functional/callback_helpers.h" |
| #include "base/logging.h" |
| #include "base/strings/string_piece.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/task/sequenced_task_runner.h" |
| #include "base/threading/scoped_blocking_call.h" |
| #include "base/threading/thread.h" |
| #include "base/threading/thread_restrictions.h" |
| #include "dbus/bus.h" |
| #include "dbus/dbus_statistics.h" |
| #include "dbus/error.h" |
| #include "dbus/message.h" |
| #include "dbus/object_path.h" |
| #include "dbus/scoped_dbus_error.h" |
| #include "dbus/util.h" |
| |
| namespace dbus { |
| |
| namespace { |
| |
| constexpr char kErrorServiceUnknown[] = |
| "org.freedesktop.DBus.Error.ServiceUnknown"; |
| constexpr char kErrorObjectUnknown[] = |
| "org.freedesktop.DBus.Error.UnknownObject"; |
| |
| // The path of D-Bus Object sending NameOwnerChanged signal. |
| constexpr char kDBusSystemObjectPath[] = "/org/freedesktop/DBus"; |
| |
| // The D-Bus Object interface. |
| constexpr char kDBusSystemObjectInterface[] = "org.freedesktop.DBus"; |
| |
| // The D-Bus Object address. |
| constexpr char kDBusSystemObjectAddress[] = "org.freedesktop.DBus"; |
| |
| // The NameOwnerChanged member in |kDBusSystemObjectInterface|. |
| constexpr char kNameOwnerChangedMember[] = "NameOwnerChanged"; |
| |
| } // namespace |
| |
| ObjectProxy::ReplyCallbackHolder::ReplyCallbackHolder( |
| scoped_refptr<base::SequencedTaskRunner> origin_task_runner, |
| ResponseOrErrorCallback callback) |
| : origin_task_runner_(std::move(origin_task_runner)), |
| callback_(std::move(callback)) { |
| DCHECK(origin_task_runner_.get()); |
| DCHECK(!callback_.is_null()); |
| } |
| |
| ObjectProxy::ReplyCallbackHolder::ReplyCallbackHolder( |
| ReplyCallbackHolder&& other) = default; |
| |
| ObjectProxy::ReplyCallbackHolder::~ReplyCallbackHolder() { |
| if (callback_.is_null()) { |
| // This is the regular case. |
| // CallMethod and its family creates this object on the origin thread, |
| // PostTask()s to the D-Bus thread for actual D-Bus communication, |
| // then PostTask()s back to the origin thread to invoke the |callback_|. |
| // At that timing, the ownership of callback should be released via |
| // ReleaseCallback(). |
| // Otherwise, this instance was moved to another one. Do nothing in |
| // either case. |
| return; |
| } |
| |
| // The only case where |origin_task_runner_| becomes nullptr is that |
| // this is moved. In such a case, |callback_| should be nullptr, too, so it |
| // should be handled above. Thus, here |origin_task_runner_| must not be |
| // nullptr. |
| DCHECK(origin_task_runner_.get()); |
| |
| if (origin_task_runner_->RunsTasksInCurrentSequence()) { |
| // Destroyed on the origin thread. This happens when PostTask()ing to |
| // the D-Bus thread fails. The |callback_| can be destroyed on the |
| // current thread safely. Do nothing here, and let member destruction |
| // destroy the callback. |
| return; |
| } |
| |
| // Here is on D-Bus thread, so try to PostTask() to destroy the callback. |
| // to the origin thread. |
| // The |origin_task_runner_| may already have stopped. E.g., on Chrome's |
| // shutdown the message loop of the UI thread (= the origin thread) stops |
| // before D-Bus threaed's. In such a case, PostTask() fails. Because we |
| // cannot do much thing here, instead, simply leak the callback rather than |
| // destroying it on the D-Bus thread, which could be unexpected from the |
| // direct or indirect caller of CallMethod. |
| auto* callback_to_be_deleted = |
| new ResponseOrErrorCallback(std::move(callback_)); |
| ANNOTATE_LEAKING_OBJECT_PTR(callback_to_be_deleted); |
| origin_task_runner_->PostTask( |
| FROM_HERE, base::BindOnce(&base::DeletePointer<ResponseOrErrorCallback>, |
| callback_to_be_deleted)); |
| } |
| |
| ObjectProxy::ResponseOrErrorCallback |
| ObjectProxy::ReplyCallbackHolder::ReleaseCallback() { |
| DCHECK(origin_task_runner_->RunsTasksInCurrentSequence()); |
| return std::move(callback_); |
| } |
| |
| 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) { |
| LOG_IF(FATAL, !object_path_.IsValid()) << object_path_.value(); |
| } |
| |
| 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. |
| base::expected<std::unique_ptr<Response>, Error> |
| ObjectProxy::CallMethodAndBlock(MethodCall* method_call, int timeout_ms) { |
| bus_->AssertOnDBusThread(); |
| |
| if (!bus_->Connect() || !method_call->SetDestination(service_name_) || |
| !method_call->SetPath(object_path_)) { |
| // Not an error from libdbus, so returns invalid error. |
| return base::unexpected(Error()); |
| } |
| |
| // Send the message synchronously. |
| auto result = |
| bus_->SendWithReplyAndBlock(method_call->raw_message(), timeout_ms); |
| statistics::AddBlockingSentMethodCall( |
| service_name_, method_call->GetInterface(), method_call->GetMember()); |
| if (!result.has_value()) { |
| LogMethodCallFailure(method_call->GetInterface(), method_call->GetMember(), |
| result.error().name(), result.error().message()); |
| } |
| return result; |
| } |
| |
| void ObjectProxy::CallMethod(MethodCall* method_call, |
| int timeout_ms, |
| ResponseCallback callback) { |
| auto internal_callback = base::BindOnce( |
| &ObjectProxy::OnCallMethod, this, method_call->GetInterface(), |
| method_call->GetMember(), std::move(callback)); |
| |
| CallMethodWithErrorResponse(method_call, timeout_ms, |
| std::move(internal_callback)); |
| } |
| |
| void ObjectProxy::CallMethodWithErrorResponse( |
| MethodCall* method_call, |
| int timeout_ms, |
| ResponseOrErrorCallback callback) { |
| bus_->AssertOnOriginThread(); |
| |
| ReplyCallbackHolder callback_holder(bus_->GetOriginTaskRunner(), |
| std::move(callback)); |
| |
| 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::RunResponseOrErrorCallback, this, |
| std::move(callback_holder), nullptr /* response */, |
| nullptr /* error_response */); |
| 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_holder)); |
| bus_->GetDBusTaskRunner()->PostTask(FROM_HERE, std::move(task)); |
| } |
| |
| void ObjectProxy::CallMethodWithErrorCallback(MethodCall* method_call, |
| int timeout_ms, |
| ResponseCallback callback, |
| ErrorCallback error_callback) { |
| auto 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)); |
| |
| CallMethodWithErrorResponse(method_call, timeout_ms, |
| std::move(internal_callback)); |
| } |
| |
| 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()) { |
| bus_->GetDBusTaskRunner()->PostTaskAndReplyWithResult( |
| FROM_HERE, |
| base::BindOnce(&ObjectProxy::ConnectToSignalAndBlock, this, |
| interface_name, signal_name, signal_callback), |
| base::BindOnce(std::move(on_connected_callback), interface_name, |
| signal_name)); |
| } else { |
| // If the bus doesn't have a dedicated dbus thread we need to call |
| // ConnectToSignalAndBlock directly otherwise we might miss a signal |
| // that is currently queued if we do a PostTask. |
| const bool success = |
| ConnectToSignalAndBlock(interface_name, signal_name, signal_callback); |
| std::move(on_connected_callback).Run(interface_name, signal_name, success); |
| } |
| } |
| |
| bool ObjectProxy::ConnectToSignalAndBlock(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', sender='%s', interface='%s', path='%s'", |
| service_name_.c_str(), interface_name.c_str(), |
| object_path_.value().c_str()); |
| return AddMatchRuleWithCallback(match_rule, absolute_signal_name, |
| signal_callback); |
| } |
| |
| void ObjectProxy::SetNameOwnerChangedCallback( |
| NameOwnerChangedCallback callback) { |
| bus_->AssertOnOriginThread(); |
| |
| name_owner_changed_callback_ = callback; |
| |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, |
| base::BindOnce(&ObjectProxy::TryConnectToNameOwnerChangedSignal, this)); |
| } |
| |
| void ObjectProxy::WaitForServiceToBeAvailable( |
| WaitForServiceToBeAvailableCallback callback) { |
| bus_->AssertOnOriginThread(); |
| |
| wait_for_service_to_be_available_callbacks_.push_back(std::move(callback)); |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, |
| base::BindOnce(&ObjectProxy::WaitForServiceToBeAvailableInternal, this)); |
| } |
| |
| void ObjectProxy::Detach() { |
| bus_->AssertOnDBusThread(); |
| |
| if (bus_->IsConnected()) |
| bus_->RemoveFilterFunction(&ObjectProxy::HandleMessageThunk, this); |
| |
| for (const auto& match_rule : match_rules_) { |
| Error error; |
| bus_->RemoveMatch(match_rule, &error); |
| if (error.IsValid()) { |
| // 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_) { |
| base::ScopedBlockingCall scoped_blocking_call( |
| FROM_HERE, base::BlockingType::MAY_BLOCK); |
| |
| dbus_pending_call_cancel(pending_call); |
| dbus_pending_call_unref(pending_call); |
| } |
| pending_calls_.clear(); |
| } |
| |
| void ObjectProxy::StartAsyncMethodCall(int timeout_ms, |
| DBusMessage* request_message, |
| ReplyCallbackHolder callback_holder) { |
| bus_->AssertOnDBusThread(); |
| base::ScopedBlockingCall scoped_blocking_call(FROM_HERE, |
| base::BlockingType::MAY_BLOCK); |
| |
| if (!bus_->Connect() || !bus_->SetUpAsyncOperations()) { |
| // In case of a failure, run the error callback with nullptr. |
| base::OnceClosure task = |
| base::BindOnce(&ObjectProxy::RunResponseOrErrorCallback, this, |
| std::move(callback_holder), nullptr /* response */, |
| nullptr /* error_response */); |
| bus_->GetOriginTaskRunner()->PostTask(FROM_HERE, std::move(task)); |
| |
| dbus_message_unref(request_message); |
| return; |
| } |
| |
| DBusPendingCall* dbus_pending_call = nullptr; |
| bus_->SendWithReply(request_message, &dbus_pending_call, timeout_ms); |
| |
| using PendingCallback = |
| base::OnceCallback<void(DBusPendingCall * pending_call)>; |
| // This returns false only when unable to allocate memory. |
| const bool success = dbus_pending_call_set_notify( |
| dbus_pending_call, |
| [](DBusPendingCall* pending_call, void* user_data) { |
| std::move(*static_cast<PendingCallback*>(user_data)).Run(pending_call); |
| }, |
| // PendingCallback instance is owned by libdbus. |
| new PendingCallback(base::BindOnce(&ObjectProxy::OnPendingCallIsComplete, |
| this, std::move(callback_holder))), |
| [](void* user_data) { delete static_cast<PendingCallback*>(user_data); }); |
| CHECK(success) << "Unable to allocate memory"; |
| pending_calls_.insert(dbus_pending_call); |
| |
| // It's now safe to unref the request message. |
| dbus_message_unref(request_message); |
| } |
| |
| void ObjectProxy::OnPendingCallIsComplete(ReplyCallbackHolder callback_holder, |
| DBusPendingCall* pending_call) { |
| bus_->AssertOnDBusThread(); |
| base::ScopedBlockingCall scoped_blocking_call(FROM_HERE, |
| base::BlockingType::MAY_BLOCK); |
| |
| DBusMessage* response_message = dbus_pending_call_steal_reply(pending_call); |
| |
| // Either |response| or |error_response| takes ownership of the |
| // |response_message|. |
| std::unique_ptr<Response> response; |
| std::unique_ptr<ErrorResponse> error_response; |
| if (dbus_message_get_type(response_message) == DBUS_MESSAGE_TYPE_ERROR) { |
| error_response = ErrorResponse::FromRawMessage(response_message); |
| } else { |
| response = Response::FromRawMessage(response_message); |
| } |
| |
| base::OnceClosure task = base::BindOnce( |
| &ObjectProxy::RunResponseOrErrorCallback, this, |
| std::move(callback_holder), response.get(), error_response.get()); |
| |
| // 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 on D-Bus thread. |
| bus_->GetOriginTaskRunner()->PostTaskAndReply( |
| FROM_HERE, std::move(task), |
| base::BindOnce( |
| [](Response* response, ErrorResponse* error_response) { |
| // Do nothing. |
| }, |
| base::Owned(response.release()), |
| base::Owned(error_response.release()))); |
| |
| // Remove the pending call from the set. |
| pending_calls_.erase(pending_call); |
| dbus_pending_call_unref(pending_call); |
| } |
| |
| void ObjectProxy::RunResponseOrErrorCallback( |
| ReplyCallbackHolder callback_holder, |
| Response* response, |
| ErrorResponse* error_response) { |
| bus_->AssertOnOriginThread(); |
| callback_holder.ReleaseCallback().Run(response, error_response); |
| } |
| |
| 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; |
| } |
| |
| void ObjectProxy::TryConnectToNameOwnerChangedSignal() { |
| bus_->AssertOnDBusThread(); |
| |
| bool success = ConnectToNameOwnerChangedSignal(); |
| LOG_IF(WARNING, !success) |
| << "Failed to connect to NameOwnerChanged signal for object: " |
| << object_path_.value(); |
| } |
| |
| 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::BindOnce(&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::BindOnce(&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; |
| } |
| |
| std::string sender = signal->GetSender(); |
| // Ignore message from sender we are not interested in. |
| if (service_name_owner_ != sender) |
| 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(); |
| |
| 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::BindOnce(&ObjectProxy::RunMethod, this, iter->second, |
| released_signal)); |
| } else { |
| // 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(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(std::vector<SignalCallback> signal_callbacks, |
| Signal* signal) { |
| bus_->AssertOnOriginThread(); |
| |
| for (auto& signal_callback : signal_callbacks) { |
| signal_callback.Run(signal); |
| } |
| |
| // Delete the message on the D-Bus thread. See comments in |
| // RunResponseOrErrorCallback(). |
| bus_->GetDBusTaskRunner()->PostTask( |
| FROM_HERE, base::BindOnce(&base::DeletePointer<Signal>, signal)); |
| } |
| |
| 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 (!base::Contains(match_rules_, match_rule)) { |
| dbus::Error error; |
| bus_->AddMatch(match_rule, &error); |
| if (error.IsValid()) { |
| 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; |
| } |
| } |
| |
| // 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 (base::Contains(match_rules_, match_rule)) { |
| return true; |
| } |
| |
| Error error; |
| bus_->AddMatch(match_rule, &error); |
| if (error.IsValid()) { |
| 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 ConnectToSignalAndBlock(). |
| 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::BindOnce(&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::BindOnce( |
| &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 (auto& callback : callbacks) { |
| std::move(callback).Run(service_is_available); |
| } |
| } |
| |
| } // namespace dbus |