Move the URLFetcher class used by the AppCacheUpdateJob class into its own file.

content/browser/appcache/appcache_update_url_fetcher.h

+// Copyright (c) 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.
+
+#ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_UPDATE_URL_FETCHER_H_
+#define CONTENT_BROWSER_APPCACHE_APPCACHE_UPDATE_URL_FETCHER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "content/browser/appcache/appcache_response.h"
+#include "content/browser/appcache/appcache_update_job.h"
+#include "net/base/io_buffer.h"
+#include "net/url_request/url_request.h"
+#include "url/gurl.h"
+
+namespace content {
+
+// Helper class to fetch resources. Depending on the fetch type,
+// can either fetch to an in-memory string or write the response
+// data out to the disk cache.
+class URLFetcher : public net::URLRequest::Delegate {
+ public:
+  enum FetchType {
+    MANIFEST_FETCH,
+    URL_FETCH,
+    MASTER_ENTRY_FETCH,
+    MANIFEST_REFETCH,
+  };
+  URLFetcher(const GURL& url,
+             FetchType fetch_type,
+             AppCacheUpdateJob* job,
+             int buffer_size);
+  ~URLFetcher() override;
+  void Start();
+  FetchType fetch_type() const { return fetch_type_; }
+  net::URLRequest* request() const { return request_.get(); }
+  const AppCacheEntry& existing_entry() const { return existing_entry_; }
+  const std::string& manifest_data() const { return manifest_data_; }
+  AppCacheResponseWriter* response_writer() const {
+    return response_writer_.get();
+  }
+  void set_existing_response_headers(net::HttpResponseHeaders* headers) {
+    existing_response_headers_ = headers;
+  }
+  void set_existing_entry(const AppCacheEntry& entry) {
+    existing_entry_ = entry;
+  }
+  AppCacheUpdateJob::ResultType result() const { return result_; }
+  int redirect_response_code() const { return redirect_response_code_; }
+
+ private:
+  // URLRequest::Delegate overrides
+  void OnReceivedRedirect(net::URLRequest* request,
+                          const net::RedirectInfo& redirect_info,
+                          bool* defer_redirect) override;
+  void OnResponseStarted(net::URLRequest* request, int net_error) override;
+  void OnReadCompleted(net::URLRequest* request, int bytes_read) override;
+
+  void AddConditionalHeaders(const net::HttpResponseHeaders* headers);
+  void OnWriteComplete(int result);
+  void ReadResponseData();
+  bool ConsumeResponseData(int bytes_read);
+  void OnResponseCompleted(int net_error);
+  bool MaybeRetryRequest();
+
+  GURL url_;
+  AppCacheUpdateJob* job_;
+  FetchType fetch_type_;
+  int retry_503_attempts_;
+  scoped_refptr<net::IOBuffer> buffer_;
+  std::unique_ptr<net::URLRequest> request_;
+  AppCacheEntry existing_entry_;
+  scoped_refptr<net::HttpResponseHeaders> existing_response_headers_;
+  std::string manifest_data_;
+  AppCacheUpdateJob::ResultType result_;
+  int redirect_response_code_;
+  std::unique_ptr<AppCacheResponseWriter> response_writer_;
+  int buffer_size_;
+};  // class URLFetcher
+
+}  // namespace content.
+
+#endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_UPDATE_URL_FETCHER_H_