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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 "chrome/browser/printing/printer_query.h"
#include <memory>
#include <utility>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/task/post_task.h"
#include "base/threading/thread_restrictions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/values.h"
#include "chrome/browser/printing/print_job_worker.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "printing/print_settings.h"
namespace printing {
PrinterQuery::PrinterQuery(int render_process_id, int render_frame_id)
: cookie_(PrintSettings::NewCookie()),
worker_(std::make_unique<PrintJobWorker>(render_process_id,
render_frame_id)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
}
PrinterQuery::~PrinterQuery() {
// The job should be finished (or at least canceled) when it is destroyed.
DCHECK(!is_print_dialog_box_shown_);
// If this fires, it is that this pending printer context has leaked.
DCHECK(!worker_);
}
void PrinterQuery::GetSettingsDone(base::OnceClosure callback,
std::unique_ptr<PrintSettings> new_settings,
PrintingContext::Result result) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
is_print_dialog_box_shown_ = false;
last_status_ = result;
if (result != PrintingContext::FAILED) {
settings_ = std::move(new_settings);
cookie_ = PrintSettings::NewCookie();
} else {
// Failure.
cookie_ = 0;
}
std::move(callback).Run();
}
void PrinterQuery::PostSettingsDoneToIO(
base::OnceClosure callback,
std::unique_ptr<PrintSettings> new_settings,
PrintingContext::Result result) {
// |this| is owned by |callback|, so |base::Unretained()| is safe.
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&PrinterQuery::GetSettingsDone, base::Unretained(this),
std::move(callback), std::move(new_settings), result));
}
std::unique_ptr<PrintJobWorker> PrinterQuery::DetachWorker() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(worker_);
return std::move(worker_);
}
const PrintSettings& PrinterQuery::settings() const {
return *settings_;
}
std::unique_ptr<PrintSettings> PrinterQuery::ExtractSettings() {
return std::move(settings_);
}
void PrinterQuery::SetSettingsForTest(std::unique_ptr<PrintSettings> settings) {
settings_ = std::move(settings);
}
int PrinterQuery::cookie() const {
return cookie_;
}
void PrinterQuery::GetSettings(GetSettingsAskParam ask_user_for_settings,
uint32_t expected_page_count,
bool has_selection,
mojom::MarginType margin_type,
bool is_scripted,
bool is_modifiable,
base::OnceClosure callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!is_print_dialog_box_shown_ || !is_scripted);
StartWorker();
// Real work is done in PrintJobWorker::GetSettings().
is_print_dialog_box_shown_ =
ask_user_for_settings == GetSettingsAskParam::ASK_USER;
// |this| is owned by |callback|, so |base::Unretained()| is safe.
worker_->PostTask(
FROM_HERE,
base::BindOnce(
&PrintJobWorker::GetSettings, base::Unretained(worker_.get()),
is_print_dialog_box_shown_, expected_page_count, has_selection,
margin_type, is_scripted, is_modifiable,
base::BindOnce(&PrinterQuery::PostSettingsDoneToIO,
base::Unretained(this), std::move(callback))));
}
void PrinterQuery::SetSettings(base::Value new_settings,
base::OnceClosure callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
StartWorker();
// |this| is owned by |callback|, so |base::Unretained()| is safe.
worker_->PostTask(
FROM_HERE,
base::BindOnce(
&PrintJobWorker::SetSettings, base::Unretained(worker_.get()),
std::move(new_settings),
base::BindOnce(&PrinterQuery::PostSettingsDoneToIO,
base::Unretained(this), std::move(callback))));
}
#if defined(OS_CHROMEOS)
void PrinterQuery::SetSettingsFromPOD(
std::unique_ptr<printing::PrintSettings> new_settings,
base::OnceClosure callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
StartWorker();
// |this| is owned by |callback|, so |base::Unretained()| is safe.
worker_->PostTask(
FROM_HERE,
base::BindOnce(
&PrintJobWorker::SetSettingsFromPOD, base::Unretained(worker_.get()),
std::move(new_settings),
base::BindOnce(&PrinterQuery::PostSettingsDoneToIO,
base::Unretained(this), std::move(callback))));
}
#endif
void PrinterQuery::StartWorker() {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(worker_);
// Lazily create the worker thread. There is one worker thread per print job.
if (!worker_->IsRunning())
worker_->Start();
}
void PrinterQuery::StopWorker() {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
if (worker_) {
// http://crbug.com/66082: We're blocking on the PrinterQuery's worker
// thread. It's not clear to me if this may result in blocking the current
// thread for an unacceptable time. We should probably fix it.
base::ScopedAllowBaseSyncPrimitivesOutsideBlockingScope allow_thread_join;
worker_->Stop();
worker_.reset();
}
}
bool PrinterQuery::PostTask(const base::Location& from_here,
base::OnceClosure task) {
return base::PostTask(from_here, {content::BrowserThread::IO},
std::move(task));
}
bool PrinterQuery::is_valid() const {
return !!worker_;
}
} // namespace printing
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