net: move host_resolver files from net/base to net/dns

net/base/mapped_host_resolver.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_BASE_MAPPED_HOST_RESOLVER_H_
-#define NET_BASE_MAPPED_HOST_RESOLVER_H_
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "net/base/host_mapping_rules.h"
-#include "net/base/host_resolver.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-// This class wraps an existing HostResolver instance, but modifies the
-// request before passing it off to |impl|. This is different from
-// MockHostResolver which does the remapping at the HostResolverProc
-// layer, so it is able to preserve the effectiveness of the cache.
-class NET_EXPORT MappedHostResolver : public HostResolver {
- public:
-  // Creates a MappedHostResolver that forwards all of its requests through
-  // |impl|.
-  explicit MappedHostResolver(scoped_ptr<HostResolver> impl);
-  virtual ~MappedHostResolver();
-
-  // Adds a rule to this mapper. The format of the rule can be one of:
-  //
-  //   "MAP" <hostname_pattern> <replacement_host> [":" <replacement_port>]
-  //   "EXCLUDE" <hostname_pattern>
-  //
-  // The <replacement_host> can be either a hostname, or an IP address literal,
-  // or "~NOTFOUND". If it is "~NOTFOUND" then all matched hostnames will fail
-  // to be resolved with ERR_NAME_NOT_RESOLVED.
-  //
-  // Returns true if the rule was successfully parsed and added.
-  bool AddRuleFromString(const std::string& rule_string) {
-    return rules_.AddRuleFromString(rule_string);
-  }
-
-  // Takes a comma separated list of rules, and assigns them to this resolver.
-  void SetRulesFromString(const std::string& rules_string) {
-    rules_.SetRulesFromString(rules_string);
-  }
-
-  // HostResolver methods:
-  virtual int Resolve(const RequestInfo& info,
-                      AddressList* addresses,
-                      const CompletionCallback& callback,
-                      RequestHandle* out_req,
-                      const BoundNetLog& net_log) OVERRIDE;
-  virtual int ResolveFromCache(const RequestInfo& info,
-                               AddressList* addresses,
-                               const BoundNetLog& net_log) OVERRIDE;
-  virtual void CancelRequest(RequestHandle req) OVERRIDE;
-  virtual void ProbeIPv6Support() OVERRIDE;
-  virtual HostCache* GetHostCache() OVERRIDE;
-
- private:
-  // Modify the request |info| according to |rules_|. Returns either OK or
-  // the network error code that the hostname's resolution mapped to.
-  int ApplyRules(RequestInfo* info) const;
-
-  scoped_ptr<HostResolver> impl_;
-
-  HostMappingRules rules_;
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_MAPPED_HOST_RESOLVER_H_