Download driver for components/download.

components/download/content/download_driver_impl.cc

+// Copyright 2017 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 "components/download/content/download_driver_impl.h"
+
+#include "content/public/browser/download_interrupt_reasons.h"
+#include "content/public/browser/download_url_parameters.h"
+#include "content/public/browser/storage_partition.h"
+
+namespace download {
+
+DownloadDriverImpl::DownloadDriverImpl(content::DownloadManager* manager,
+                                       const base::FilePath& dir)
+    : download_manager_(manager), file_dir_(dir), client_(nullptr) {
+  DCHECK(download_manager_);
+  download_manager_->AddObserver(this);

[David Trainor- moved to gerrit, 2017/05/18 18:29:44]

Maybe do this ininitialize?  That way we don't have to worry about getting
callbacks without a client?

[xingliu, 2017/05/18 22:21:49]

Done. Makes sense.

+}
+
+DownloadDriverImpl::~DownloadDriverImpl() = default;
+
+void DownloadDriverImpl::Initialize(DownloadDriver::Client* client) {
+  DCHECK(!client_ && download_manager_);

[David Trainor- moved to gerrit, 2017/05/18 18:29:44]

Don't need the download_manager_ dcheck here right?

[xingliu, 2017/05/18 22:21:49]

Done, forgot we have a DCHECK in the ctor.

+  client_ = client;
+  DCHECK(client_);
+  if (download_manager_->IsManagerInitialized())
+    client_->OnDriverReady();
+}
+
+void DownloadDriverImpl::Start(const DownloadParams& params) {
+  DCHECK(!params.request_params.url.is_empty());
+  DCHECK(!params.guid.empty());
+
+  content::StoragePartition* storage_partition =
+      content::BrowserContext::GetStoragePartitionForSite(
+          download_manager_->GetBrowserContext(), params.request_params.url);
+  DCHECK(storage_partition);
+
+  std::unique_ptr<content::DownloadUrlParameters> download_url_params(
+      new content::DownloadUrlParameters(
+          params.request_params.url,
+          storage_partition->GetURLRequestContext()));
+
+  // TODO(xingliu): Handle the request headers from |params|, need to tweak
+  // download network stack.
+  download_url_params->set_guid(params.guid);
+  download_url_params->set_transient(true);
+  download_url_params->set_method(params.request_params.method);
+  download_url_params->set_file_path(file_dir_.Append(params.guid));
+
+  download_manager_->DownloadUrl(std::move(download_url_params));
+}
+
+void DownloadDriverImpl::Cancel(const std::string& guid) {
+  content::DownloadItem* item = download_manager_->GetDownloadByGuid(guid);
+  // Cancels the download and removes the persisted records in content layer.
+  if (item) {
+    item->RemoveObserver(this);
+    item->Remove();
+  }
+}
+
+void DownloadDriverImpl::Pause(const std::string& guid) {
+  content::DownloadItem* item = download_manager_->GetDownloadByGuid(guid);
+  if (item)
+    item->Pause();
+}
+
+void DownloadDriverImpl::Resume(const std::string& guid) {
+  content::DownloadItem* item = download_manager_->GetDownloadByGuid(guid);
+  if (item)
+    item->Resume();
+}
+
+DriverEntry DownloadDriverImpl::Find(const std::string& guid) {
+  content::DownloadItem* item = download_manager_->GetDownloadByGuid(guid);
+  DriverEntry entry;
+  return item ? DriverEntry::Create(item) : entry;

[David Trainor- moved to gerrit, 2017/05/18 18:29:44]

Your conversion function might have to live somewhere outside of DriverEntry.

[xingliu, 2017/05/18 22:21:49]

Done. Move the conversion function to this file as helper function.

+}
+
+void DownloadDriverImpl::OnDownloadUpdated(content::DownloadItem* item) {
+  DCHECK(item);
+  if (!client_)

[David Trainor- moved to gerrit, 2017/05/18 18:29:43]

We should probably still clean up our observer ties?  Maybe just DCHECK client?

[xingliu, 2017/05/18 22:21:49]

Done. Changed all if check to DCHECK(client_);.

+    return;
+
+  using DownloadState = content::DownloadItem::DownloadState;
+  DownloadState state = item->GetState();
+  content::DownloadInterruptReason reason = item->GetLastReason();
+  DriverEntry entry = DriverEntry::Create(item);
+
+  if (state == DownloadState::COMPLETE) {
+    client_->OnDownloadSucceeded(entry, item->GetTargetFilePath());
+    item->RemoveObserver(this);
+  } else if (state == DownloadState::IN_PROGRESS) {
+    client_->OnDownloadUpdated(entry);
+  } else if (reason !=
+             content::DownloadInterruptReason::DOWNLOAD_INTERRUPT_REASON_NONE) {
+    client_->OnDownloadFailed(entry, static_cast<int>(reason));
+    item->RemoveObserver(this);
+  }
+}
+
+void DownloadDriverImpl::OnDownloadCreated(content::DownloadManager* manager,
+                                           content::DownloadItem* item) {
+  // Listens to all downloads.
+  item->AddObserver(this);
+
+  if (client_) {
+    DriverEntry entry = DriverEntry::Create(item);
+    client_->OnDownloadCreated(entry);
+  }
+}
+
+void DownloadDriverImpl::OnManagerInitialized() {
+  if (client_)
+    client_->OnDriverReady();
+}
+
+void DownloadDriverImpl::ManagerGoingDown(content::DownloadManager* manager) {
+  manager->RemoveObserver(this);
+}
+
+}  // namespace download