service worker: Refactor blob reading out of ServiceWorkerURLRequestJob

content/browser/service_worker/service_worker_blob_reader.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 "content/browser/service_worker/service_worker_blob_reader.h"
+
+#include <utility>
+
+#include "storage/browser/blob/blob_data_handle.h"
+#include "storage/browser/blob/blob_url_request_job_factory.h"
+
+namespace content {
+
+ServiceWorkerBlobReader::ServiceWorkerBlobReader(
+    ServiceWorkerURLRequestJob* owner)
+    : owner_(owner) {}
+
+ServiceWorkerBlobReader::~ServiceWorkerBlobReader() {}
+
+void ServiceWorkerBlobReader::Start(
+    std::unique_ptr<storage::BlobDataHandle> blob_data_handle,
+    const net::URLRequestContext* request_context) {
+  blob_request_ = storage::BlobProtocolHandler::CreateBlobRequest(
+      std::move(blob_data_handle), request_context, this);
+  blob_request_->Start();
+}
+
+void ServiceWorkerBlobReader::OnReceivedRedirect(
+    net::URLRequest* request,
+    const net::RedirectInfo& redirect_info,
+    bool* defer_redirect) {
+  NOTREACHED();
+}
+
+void ServiceWorkerBlobReader::OnAuthRequired(
+    net::URLRequest* request,
+    net::AuthChallengeInfo* auth_info) {
+  NOTREACHED();
+}
+
+void ServiceWorkerBlobReader::OnCertificateRequested(
+    net::URLRequest* request,
+    net::SSLCertRequestInfo* cert_request_info) {
+  NOTREACHED();
+}
+
+void ServiceWorkerBlobReader::OnSSLCertificateError(
+    net::URLRequest* request,
+    const net::SSLInfo& ssl_info,
+    bool fatal) {
+  NOTREACHED();
+}
+
+void ServiceWorkerBlobReader::OnResponseStarted(net::URLRequest* request) {
+  // TODO(falken): This should check request->status() per URLRequest::Delegate
+  // contract.
+  // TODO(falken): Add Content-Length, Content-Type if they were not provided in
+  // the ServiceWorkerResponse.
+  owner_->OnResponseStarted();
+}
+
+void ServiceWorkerBlobReader::OnReadCompleted(net::URLRequest* request,
+                                              int bytes_read) {
+  if (!request->status().is_success()) {
+    owner_->RecordResult(ServiceWorkerMetrics::REQUEST_JOB_ERROR_BLOB_READ);
+  } else if (bytes_read == 0) {
+    owner_->RecordResult(ServiceWorkerMetrics::REQUEST_JOB_BLOB_RESPONSE);
+  }
+  net::URLRequestStatus status = request->status();
+  owner_->OnReadRawDataComplete(status.is_success() ? bytes_read
+                                                    : status.error());
+}
+
+int ServiceWorkerBlobReader::ReadRawData(net::IOBuffer* buf, int buf_size) {
+  int bytes_read = 0;
+  blob_request_->Read(buf, buf_size, &bytes_read);
+  net::URLRequestStatus status = blob_request_->status();
+  if (status.status() != net::URLRequestStatus::SUCCESS)
+    return status.error();
+  if (bytes_read == 0) {
+    owner_->RecordResult(ServiceWorkerMetrics::REQUEST_JOB_BLOB_RESPONSE);
+  }
+  return bytes_read;
+}
+
+}  // namespace content