Refactor: Extract "InitProxyResolver" to "ProxyScriptDecider".

net/proxy/init_proxy_resolver.h

-// Copyright (c) 2011 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 NET_PROXY_INIT_PROXY_RESOLVER_H_
-#define NET_PROXY_INIT_PROXY_RESOLVER_H_
-#pragma once
-
-#include <vector>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/string16.h"
-#include "base/time.h"
-#include "base/timer.h"
-#include "googleurl/src/gurl.h"
-#include "net/base/completion_callback.h"
-#include "net/base/net_export.h"
-#include "net/base/net_log.h"
-
-namespace net {
-
-class DhcpProxyScriptFetcher;
-class NetLogParameter;
-class ProxyConfig;
-class ProxyResolver;
-class ProxyScriptFetcher;
-
-// InitProxyResolver is a helper class used by ProxyService to
-// initialize a ProxyResolver with the PAC script data specified
-// by a particular ProxyConfig.
-//
-// This involves trying to use PAC scripts in this order:
-//
-//   (1) WPAD (DNS) if auto-detect is on.
-//   (2) Custom PAC script if a URL was given.
-//
-// If no PAC script was successfully downloaded + parsed, then it fails with
-// a network error. Otherwise the proxy resolver is left initialized with
-// the PAC script.
-//
-// Deleting InitProxyResolver while Init() is in progress, will
-// cancel the request.
-//
-class NET_EXPORT_PRIVATE InitProxyResolver {
- public:
-  // |resolver|, |proxy_script_fetcher|, |dhcp_proxy_script_fetcher| and
-  // |net_log| must remain valid for the lifespan of InitProxyResolver.
-  InitProxyResolver(ProxyResolver* resolver,
-                    ProxyScriptFetcher* proxy_script_fetcher,
-                    DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher,
-                    NetLog* net_log);
-
-  // Aborts any in-progress request.
-  ~InitProxyResolver();
-
-  // Applies the PAC settings of |config| to |resolver_|.
-  // If |wait_delay| is positive, the initialization will pause for this
-  // amount of time before getting started.
-  // If |effective_config| is non-NULL, then on successful initialization of
-  // |resolver_| the "effective" proxy settings we ended up using will be
-  // written out to |*effective_config|. Note that this may differ from
-  // |config| since we will have stripped any manual settings, and decided
-  // whether to use auto-detect or the custom PAC URL. Finally, if auto-detect
-  // was used we may now have resolved that to a specific script URL.
-  int Init(const ProxyConfig& config,
-           const base::TimeDelta wait_delay,
-           ProxyConfig* effective_config,
-           OldCompletionCallback* callback);
-
- private:
-  // Represents the sources from which we can get PAC files; two types of
-  // auto-detect or a custom URL.
-  struct PacSource {
-    enum Type {
-      WPAD_DHCP,
-      WPAD_DNS,
-      CUSTOM
-    };
-
-    PacSource(Type type, const GURL& url)
-        : type(type), url(url) {}
-
-    Type type;
-    GURL url;  // Empty unless |type == PAC_SOURCE_CUSTOM|.
-  };
-
-  typedef std::vector<PacSource> PacSourceList;
-
-  enum State {
-    STATE_NONE,
-    STATE_WAIT,
-    STATE_WAIT_COMPLETE,
-    STATE_FETCH_PAC_SCRIPT,
-    STATE_FETCH_PAC_SCRIPT_COMPLETE,
-    STATE_SET_PAC_SCRIPT,
-    STATE_SET_PAC_SCRIPT_COMPLETE,
-  };
-
-  // Returns ordered list of PAC urls to try for |config|.
-  PacSourceList BuildPacSourcesFallbackList(const ProxyConfig& config) const;
-
-  void OnIOCompletion(int result);
-  int DoLoop(int result);
-  void DoCallback(int result);
-
-  int DoWait();
-  int DoWaitComplete(int result);
-
-  int DoFetchPacScript();
-  int DoFetchPacScriptComplete(int result);
-
-  int DoSetPacScript();
-  int DoSetPacScriptComplete(int result);
-
-  // Tries restarting using the next fallback PAC URL:
-  // |pac_sources_[++current_pac_source_index]|.
-  // Returns OK and rewinds the state machine when there
-  // is something to try, otherwise returns |error|.
-  int TryToFallbackPacSource(int error);
-
-  // Gets the initial state (we skip fetching when the
-  // ProxyResolver doesn't |expect_pac_bytes()|.
-  State GetStartState() const;
-
-  NetLogStringParameter* CreateNetLogParameterAndDetermineURL(
-      const PacSource& pac_source, GURL* effective_pac_url);
-
-  // Returns the current PAC URL we are fetching/testing.
-  const PacSource& current_pac_source() const;
-
-  void OnWaitTimerFired();
-  void DidCompleteInit();
-  void Cancel();
-
-  ProxyResolver* resolver_;
-  ProxyScriptFetcher* proxy_script_fetcher_;
-  DhcpProxyScriptFetcher* dhcp_proxy_script_fetcher_;
-
-  OldCompletionCallbackImpl<InitProxyResolver> io_callback_;
-  OldCompletionCallback* user_callback_;
-
-  size_t current_pac_source_index_;
-
-  // Filled when the PAC script fetch completes.
-  string16 pac_script_;
-
-  // Flag indicating whether the caller requested a mandatory pac script
-  // (i.e. fallback to direct connections are prohibited).
-  bool pac_mandatory_;
-
-  PacSourceList pac_sources_;
-  State next_state_;
-
-  BoundNetLog net_log_;
-
-  base::TimeDelta wait_delay_;
-  base::OneShotTimer<InitProxyResolver> wait_timer_;
-
-  ProxyConfig* effective_config_;
-
-  DISALLOW_COPY_AND_ASSIGN(InitProxyResolver);
-};
-
-}  // namespace net
-
-#endif  // NET_PROXY_INIT_PROXY_RESOLVER_H_