Remove //net (except for Android test stuff) and sdch

net/dns/dns_config_service.h

-// Copyright (c) 2012 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_DNS_DNS_CONFIG_SERVICE_H_
-#define NET_DNS_DNS_CONFIG_SERVICE_H_
-
-#include <map>
-#include <string>
-#include <vector>
-
-#include "base/gtest_prod_util.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/scoped_vector.h"
-#include "base/threading/non_thread_safe.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-// Needed on shared build with MSVS2010 to avoid multiple definitions of
-// std::vector<IPEndPoint>.
-#include "net/base/address_list.h"
-#include "net/base/ip_endpoint.h"  // win requires size of IPEndPoint
-#include "net/base/net_export.h"
-#include "net/dns/dns_hosts.h"
-
-namespace base {
-class Value;
-}
-
-namespace net {
-
-// Always use 1 second timeout (followed by binary exponential backoff).
-// TODO(szym): Remove code which reads timeout from system.
-const unsigned kDnsTimeoutSeconds = 1;
-
-// Classifies nameserver address lists for histograms.
-class NET_EXPORT_PRIVATE NameServerClassifier {
- public:
-  // This is used in a histogram (AsyncDNS.NameServersType); add new entries
-  // right before MAX_VALUE.
-  enum NameServersType {
-    NAME_SERVERS_TYPE_NONE,
-    NAME_SERVERS_TYPE_GOOGLE_PUBLIC_DNS,
-    NAME_SERVERS_TYPE_PRIVATE,
-    NAME_SERVERS_TYPE_PUBLIC,
-    NAME_SERVERS_TYPE_MIXED,
-    NAME_SERVERS_TYPE_MAX_VALUE
-  };
-
-  NameServerClassifier();
-  ~NameServerClassifier();
-
-  NameServersType GetNameServersType(
-      const std::vector<net::IPEndPoint>& nameservers) const;
-
- private:
-  struct NameServerTypeRule;
-
-  void AddRule(const char* pattern_string, NameServersType type);
-  NameServersType GetNameServerType(const IPAddressNumber& address) const;
-  static NameServersType MergeNameServersTypes(NameServersType a,
-                                               NameServersType b);
-
-  ScopedVector<NameServerTypeRule> rules_;
-};
-
-// DnsConfig stores configuration of the system resolver.
-struct NET_EXPORT_PRIVATE DnsConfig {
-  DnsConfig();
-  virtual ~DnsConfig();
-
-  bool Equals(const DnsConfig& d) const;
-
-  bool EqualsIgnoreHosts(const DnsConfig& d) const;
-
-  void CopyIgnoreHosts(const DnsConfig& src);
-
-  // Returns a Value representation of |this|.  Caller takes ownership of the
-  // returned Value.  For performance reasons, the Value only contains the
-  // number of hosts rather than the full list.
-  base::Value* ToValue() const;
-
-  bool IsValid() const {
-    return !nameservers.empty();
-  }
-
-  // List of name server addresses.
-  std::vector<IPEndPoint> nameservers;
-  // Suffix search list; used on first lookup when number of dots in given name
-  // is less than |ndots|.
-  std::vector<std::string> search;
-
-  DnsHosts hosts;
-
-  // True if there are options set in the system configuration that are not yet
-  // supported by DnsClient.
-  bool unhandled_options;
-
-  // AppendToMultiLabelName: is suffix search performed for multi-label names?
-  // True, except on Windows where it can be configured.
-  bool append_to_multi_label_name;
-
-  // Indicates that source port randomization is required. This uses additional
-  // resources on some platforms.
-  bool randomize_ports;
-
-  // Resolver options; see man resolv.conf.
-
-  // Minimum number of dots before global resolution precedes |search|.
-  int ndots;
-  // Time between retransmissions, see res_state.retrans.
-  base::TimeDelta timeout;
-  // Maximum number of attempts, see res_state.retry.
-  int attempts;
-  // Round robin entries in |nameservers| for subsequent requests.
-  bool rotate;
-  // Enable EDNS0 extensions.
-  bool edns0;
-
-  // Indicates system configuration uses local IPv6 connectivity, e.g.,
-  // DirectAccess. This is exposed for HostResolver to skip IPv6 probes,
-  // as it may cause them to return incorrect results.
-  bool use_local_ipv6;
-};
-
-// Service for reading system DNS settings, on demand or when signalled by
-// internal watchers and NetworkChangeNotifier.
-class NET_EXPORT_PRIVATE DnsConfigService
-    : NON_EXPORTED_BASE(public base::NonThreadSafe) {
- public:
-  // Callback interface for the client, called on the same thread as
-  // ReadConfig() and WatchConfig().
-  typedef base::Callback<void(const DnsConfig& config)> CallbackType;
-
-  // Creates the platform-specific DnsConfigService.
-  static scoped_ptr<DnsConfigService> CreateSystemService();
-
-  DnsConfigService();
-  virtual ~DnsConfigService();
-
-  // Attempts to read the configuration. Will run |callback| when succeeded.
-  // Can be called at most once.
-  void ReadConfig(const CallbackType& callback);
-
-  // Registers systems watchers. Will attempt to read config after watch starts,
-  // but only if watchers started successfully. Will run |callback| iff config
-  // changes from last call or has to be withdrawn. Can be called at most once.
-  // Might require MessageLoopForIO.
-  void WatchConfig(const CallbackType& callback);
-
- protected:
-  enum WatchStatus {
-    DNS_CONFIG_WATCH_STARTED = 0,
-    DNS_CONFIG_WATCH_FAILED_TO_START_CONFIG,
-    DNS_CONFIG_WATCH_FAILED_TO_START_HOSTS,
-    DNS_CONFIG_WATCH_FAILED_CONFIG,
-    DNS_CONFIG_WATCH_FAILED_HOSTS,
-    DNS_CONFIG_WATCH_MAX,
-  };
-
- // Immediately attempts to read the current configuration.
-  virtual void ReadNow() = 0;
-  // Registers system watchers. Returns true iff succeeds.
-  virtual bool StartWatching() = 0;
-
-  // Called when the current config (except hosts) has changed.
-  void InvalidateConfig();
-  // Called when the current hosts have changed.
-  void InvalidateHosts();
-
-  // Called with new config. |config|.hosts is ignored.
-  void OnConfigRead(const DnsConfig& config);
-  // Called with new hosts. Rest of the config is assumed unchanged.
-  void OnHostsRead(const DnsHosts& hosts);
-
-  void set_watch_failed(bool value) { watch_failed_ = value; }
-
- private:
-  // The timer counts from the last Invalidate* until complete config is read.
-  void StartTimer();
-  void OnTimeout();
-  // Called when the config becomes complete. Stops the timer.
-  void OnCompleteConfig();
-
-  CallbackType callback_;
-
-  DnsConfig dns_config_;
-
-  // True if any of the necessary watchers failed. In that case, the service
-  // will communicate changes via OnTimeout, but will only send empty DnsConfig.
-  bool watch_failed_;
-  // True after On*Read, before Invalidate*. Tells if the config is complete.
-  bool have_config_;
-  bool have_hosts_;
-  // True if receiver needs to be updated when the config becomes complete.
-  bool need_update_;
-  // True if the last config sent was empty (instead of |dns_config_|).
-  // Set when |timer_| expires.
-  bool last_sent_empty_;
-
-  // Initialized and updated on Invalidate* call.
-  base::TimeTicks last_invalidate_config_time_;
-  base::TimeTicks last_invalidate_hosts_time_;
-  // Initialized and updated when |timer_| expires.
-  base::TimeTicks last_sent_empty_time_;
-
-  // Started in Invalidate*, cleared in On*Read.
-  base::OneShotTimer<DnsConfigService> timer_;
-
-  NameServerClassifier classifier_;
-
-  DISALLOW_COPY_AND_ASSIGN(DnsConfigService);
-};
-
-}  // namespace net
-
-#endif  // NET_DNS_DNS_CONFIG_SERVICE_H_