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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 "chromeos/dbus/lorgnette_manager_client.h"
#include <string>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/location.h"
#include "base/memory/ref_counted_memory.h"
#include "base/platform_file.h"
#include "base/threading/worker_pool.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "dbus/object_proxy.h"
#include "net/base/file_stream.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace chromeos {
// The LorgnetteManagerClient implementation used in production.
class LorgnetteManagerClientImpl : public LorgnetteManagerClient {
public:
LorgnetteManagerClientImpl() :
lorgnette_daemon_proxy_(NULL), weak_ptr_factory_(this) {}
virtual ~LorgnetteManagerClientImpl() {}
virtual void ListScanners(const ListScannersCallback& callback) OVERRIDE {
dbus::MethodCall method_call(lorgnette::kManagerServiceInterface,
lorgnette::kListScannersMethod);
lorgnette_daemon_proxy_->CallMethod(
&method_call,
dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&LorgnetteManagerClientImpl::OnListScanners,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
// LorgnetteManagerClient override.
virtual void ScanImage(std::string device_name,
base::PlatformFile file,
const ScanProperties& properties,
const ScanImageCallback& callback) OVERRIDE {
dbus::FileDescriptor* file_descriptor = new dbus::FileDescriptor();
file_descriptor->PutValue(file);
// Punt descriptor validity check to a worker thread; on return we'll
// issue the D-Bus request to stop tracing and collect results.
base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&LorgnetteManagerClientImpl::CheckValidity,
file_descriptor),
base::Bind(&LorgnetteManagerClientImpl::OnCheckValidityScanImage,
weak_ptr_factory_.GetWeakPtr(),
base::Owned(file_descriptor),
device_name,
properties,
callback),
false);
}
protected:
virtual void Init(dbus::Bus* bus) OVERRIDE {
lorgnette_daemon_proxy_ =
bus->GetObjectProxy(lorgnette::kManagerServiceName,
dbus::ObjectPath(lorgnette::kManagerServicePath));
}
private:
// Called when ListScanners completes.
void OnListScanners(const ListScannersCallback& callback,
dbus::Response* response) {
ScannerTable scanners;
dbus::MessageReader table_reader(NULL);
if (!response || !dbus::MessageReader(response).PopArray(&table_reader)) {
callback.Run(false, scanners);
return;
}
bool decode_failure = false;
while (table_reader.HasMoreData()) {
std::string device_name;
dbus::MessageReader device_entry_reader(NULL);
dbus::MessageReader device_element_reader(NULL);
if (!table_reader.PopDictEntry(&device_entry_reader) ||
!device_entry_reader.PopString(&device_name) ||
!device_entry_reader.PopArray(&device_element_reader)) {
decode_failure = true;
break;
}
ScannerTableEntry scanner_entry;
while (device_element_reader.HasMoreData()) {
dbus::MessageReader device_attribute_reader(NULL);
std::string attribute;
std::string value;
if (!device_element_reader.PopDictEntry(&device_attribute_reader) ||
!device_attribute_reader.PopString(&attribute) ||
!device_attribute_reader.PopString(&value)) {
decode_failure = true;
break;
}
scanner_entry[attribute] = value;
}
if (decode_failure)
break;
scanners[device_name] = scanner_entry;
}
if (decode_failure) {
LOG(ERROR) << "Failed to decode response from ListScanners";
callback.Run(false, scanners);
} else {
callback.Run(true, scanners);
}
}
// Called to check descriptor validity on a thread where i/o is permitted.
static void CheckValidity(dbus::FileDescriptor* file_descriptor) {
file_descriptor->CheckValidity();
}
// Called when a CheckValidity response is received.
void OnCheckValidityScanImage(
dbus::FileDescriptor* file_descriptor,
std::string device_name,
const ScanProperties& properties,
const ScanImageCallback& callback) {
if (!file_descriptor->is_valid()) {
LOG(ERROR) << "Failed to scan image: file descriptor is invalid";
callback.Run(false);
return;
}
// Issue the dbus request to scan an image.
dbus::MethodCall method_call(
lorgnette::kManagerServiceInterface,
lorgnette::kScanImageMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendString(device_name);
writer.AppendFileDescriptor(*file_descriptor);
dbus::MessageWriter option_writer(NULL);
dbus::MessageWriter element_writer(NULL);
writer.OpenArray("{sv}", &option_writer);
if (!properties.mode.empty()) {
option_writer.OpenDictEntry(&element_writer);
element_writer.AppendString(lorgnette::kScanPropertyMode);
element_writer.AppendVariantOfString(properties.mode);
option_writer.CloseContainer(&element_writer);
}
if (properties.resolution_dpi) {
option_writer.OpenDictEntry(&element_writer);
element_writer.AppendString(lorgnette::kScanPropertyResolution);
element_writer.AppendVariantOfUint32(properties.resolution_dpi);
option_writer.CloseContainer(&element_writer);
}
writer.CloseContainer(&option_writer);
lorgnette_daemon_proxy_->CallMethod(
&method_call,
dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&LorgnetteManagerClientImpl::OnScanImageComplete,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
// Called when a response for ScanImage() is received.
void OnScanImageComplete(const ScanImageCallback& callback,
dbus::Response* response) {
if (!response) {
LOG(ERROR) << "Failed to scan image";
callback.Run(false);
return;
}
callback.Run(true);
}
dbus::ObjectProxy* lorgnette_daemon_proxy_;
base::WeakPtrFactory<LorgnetteManagerClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(LorgnetteManagerClientImpl);
};
LorgnetteManagerClient::LorgnetteManagerClient() {
}
LorgnetteManagerClient::~LorgnetteManagerClient() {
}
// static
LorgnetteManagerClient* LorgnetteManagerClient::Create() {
return new LorgnetteManagerClientImpl();
}
} // namespace chromeos
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