Separate mojo/shell into a runner and the application manager (shell)

mojo/shell/application_manager/fetcher.h

-// Copyright 2015 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 SHELL_APPLICATION_MANAGER_FETCHER_H_
-#define SHELL_APPLICATION_MANAGER_FETCHER_H_
-
-#include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
-
-#include "mojo/services/network/public/interfaces/url_loader.mojom.h"
-
-class GURL;
-
-namespace base {
-class FilePath;
-class TaskRunner;
-}
-
-namespace mojo {
-namespace shell {
-
-// Fetcher abstracts getting an application by either file or http[s] URL.
-//
-// Although it is possible to use the Network implementation for http[s] URLs
-// (because the underlying net library knows how to handle them), it is
-// extremely slow because network responses must be copied to disk in order to
-// get a file handle we can use with dlopen.
-//
-// Until this is solved, we use two different implementations so that
-// performance isn't completely absymal.
-class Fetcher {
- public:
-  // The param will be null in the case where the content could not be fetched.
-  // Reasons include:
-  // - network error
-  // - 4x or 5x HTTP errors
-  typedef base::Callback<void(scoped_ptr<Fetcher>)> FetchCallback;
-
-  Fetcher(const FetchCallback& fetch_callback);
-  virtual ~Fetcher();
-
-  // Returns the original URL that was fetched.
-  virtual const GURL& GetURL() const = 0;
-
-  // If the fetch resulted in a redirect, this returns the final URL after all
-  // redirects. Otherwise, it returns an empty URL.
-  virtual GURL GetRedirectURL() const = 0;
-
-  virtual URLResponsePtr AsURLResponse(base::TaskRunner* task_runner,
-                                       uint32_t skip) = 0;
-
-  virtual void AsPath(
-      base::TaskRunner* task_runner,
-      base::Callback<void(const base::FilePath&, bool)> callback) = 0;
-
-  virtual std::string MimeType() = 0;
-
-  virtual bool HasMojoMagic() = 0;
-
-  virtual bool PeekFirstLine(std::string* line) = 0;
-
-  bool PeekContentHandler(std::string* mojo_shebang,
-                          GURL* mojo_content_handler_url);
-
- protected:
-  static const char kMojoMagic[];
-  static const size_t kMaxShebangLength;
-
-  FetchCallback loader_callback_;
-};
-
-}  // namespace shell
-}  // namespace mojo
-
-#endif  // SHELL_APPLICATION_MANAGER_FETCHER_H_