Stub for ARC print Bridge

chrome/browser/chromeos/arc/arc_print_service.cc

+// Copyright 2016 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/chromeos/arc/arc_print_service.h"
+
+#include <utility>
+
+#include "ash/common/shell_delegate.h"
+#include "ash/common/wm_shell.h"
+#include "base/files/file.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/optional.h"
+#include "base/threading/thread_checker.h"
+#include "components/arc/arc_bridge_service.h"
+#include "content/public/browser/browser_thread.h"
+#include "mojo/edk/embedder/embedder.h"
+#include "net/base/filename_util.h"
+#include "url/gurl.h"
+
+namespace {
+
+base::Optional<base::FilePath> SavePdf(base::File file) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::FILE);
+
+  base::FilePath file_path;
+  base::CreateTemporaryFile(&file_path);

[Lei Zhang, 2016/07/29 21:40:22]

Check for failure?

+  base::File out(file_path,
+                 base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
+
+  char buf[8192];
+  ssize_t bytes;
+  while ((bytes = file.ReadAtCurrentPos(buf, sizeof(buf))) > 0) {
+    int written = out.WriteAtCurrentPos(buf, bytes);
+    if (written < 0) {
+      LOG(ERROR) << "Error while saving PDF to a disk";
+      return base::nullopt;

[Lei Zhang, 2016/07/29 21:40:22]

Can't you just return an empty FilePath to indicate failure? i.e. no need for
Optional.

+    }
+  }
+
+  return file_path;
+}
+
+void OpenPdf(base::Optional<base::FilePath> file_path) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (!file_path)
+    return;
+
+  GURL gurl = net::FilePathToFileURL(file_path.value());
+  ash::WmShell::Get()->delegate()->OpenUrl(gurl);
+  // TODO(poromov) Delete file after printing. (http://crbug.com/629843)
+}
+
+}  // namespace
+
+namespace arc {
+
+ArcPrintService::ArcPrintService(ArcBridgeService* bridge_service)
+    : ArcService(bridge_service), binding_(this) {
+  arc_bridge_service()->print()->AddObserver(this);
+}
+
+ArcPrintService::~ArcPrintService() {
+  arc_bridge_service()->print()->RemoveObserver(this);
+}
+
+void ArcPrintService::OnInstanceReady() {
+  mojom::PrintInstance* print_instance =
+      arc_bridge_service()->print()->instance();
+  if (!print_instance) {
+    LOG(ERROR) << "OnPrintInstanceReady called, but no print instance found";
+    return;
+  }
+
+  print_instance->Init(binding_.CreateInterfacePtrAndBind());
+}
+
+void ArcPrintService::Print(mojo::ScopedHandle pdf_data) {
+  if (!pdf_data.is_valid()) {
+    LOG(ERROR) << "handle is invalid";
+    return;
+  }
+
+  mojo::edk::ScopedPlatformHandle scoped_platform_handle;
+  MojoResult mojo_result = mojo::edk::PassWrappedPlatformHandle(
+      pdf_data.release().value(), &scoped_platform_handle);
+  if (mojo_result != MOJO_RESULT_OK) {
+    LOG(ERROR) << "PassWrappedPlatformHandle failed: " << mojo_result;
+    return;
+  }
+
+  base::File file(scoped_platform_handle.release().handle);
+
+  content::BrowserThread::PostTaskAndReplyWithResult(
+      content::BrowserThread::FILE, FROM_HERE,
+      base::Bind(&SavePdf, base::Passed(&file)), base::Bind(&OpenPdf));
+}
+
+}  // namespace arc