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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef NET_BASE_HOST_RESOLVER_H_ | 5 #ifndef NET_BASE_HOST_RESOLVER_H_ |
6 #define NET_BASE_HOST_RESOLVER_H_ | 6 #define NET_BASE_HOST_RESOLVER_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
12 #include "base/lock.h" | 12 #include "base/lock.h" |
13 #include "base/ref_counted.h" | 13 #include "base/ref_counted.h" |
| 14 #include "googleurl/src/gurl.h" |
14 #include "net/base/completion_callback.h" | 15 #include "net/base/completion_callback.h" |
15 #include "net/base/host_cache.h" | 16 #include "net/base/host_cache.h" |
16 | 17 |
17 class MessageLoop; | 18 class MessageLoop; |
18 | 19 |
19 namespace net { | 20 namespace net { |
20 | 21 |
21 class AddressList; | 22 class AddressList; |
| 23 class DnsResolutionObserver; |
22 class HostMapper; | 24 class HostMapper; |
23 | 25 |
24 // This class represents the task of resolving hostnames (or IP address | 26 // This class represents the task of resolving hostnames (or IP address |
25 // literal) to an AddressList object. | 27 // literal) to an AddressList object. |
26 // | 28 // |
27 // HostResolver handles multiple requests at a time, so when cancelling a | 29 // HostResolver handles multiple requests at a time, so when cancelling a |
28 // request the Request* handle that was returned by Resolve() needs to be | 30 // request the Request* handle that was returned by Resolve() needs to be |
29 // given. A simpler alternative for consumers that only have 1 outstanding | 31 // given. A simpler alternative for consumers that only have 1 outstanding |
30 // request at a time is to create a SingleRequestHostResolver wrapper around | 32 // request at a time is to create a SingleRequestHostResolver wrapper around |
31 // HostResolver (which will automatically cancel the single request when it | 33 // HostResolver (which will automatically cancel the single request when it |
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51 // | 53 // |
52 // | 54 // |
53 // When a HostResolver::Job finishes its work in the threadpool, the callbacks | 55 // When a HostResolver::Job finishes its work in the threadpool, the callbacks |
54 // of each waiting request are run on the origin thread. | 56 // of each waiting request are run on the origin thread. |
55 // | 57 // |
56 // Thread safety: This class is not threadsafe, and must only be called | 58 // Thread safety: This class is not threadsafe, and must only be called |
57 // from one thread! | 59 // from one thread! |
58 // | 60 // |
59 class HostResolver { | 61 class HostResolver { |
60 public: | 62 public: |
| 63 // The parameters for doing a Resolve(). |hostname| and |port| are required, |
| 64 // the rest are optional (and have reasonable defaults). |
| 65 class RequestInfo { |
| 66 public: |
| 67 RequestInfo(const std::string& hostname, int port) |
| 68 : hostname_(hostname), |
| 69 port_(port), |
| 70 allow_cached_response_(true), |
| 71 is_speculative_(false) {} |
| 72 |
| 73 const int port() const { return port_; } |
| 74 const std::string& hostname() const { return hostname_; } |
| 75 |
| 76 bool allow_cached_response() const { return allow_cached_response_; } |
| 77 void set_allow_cached_response(bool b) { allow_cached_response_ = b; } |
| 78 |
| 79 bool is_speculative() const { return is_speculative_; } |
| 80 void set_is_speculative(bool b) { is_speculative_ = b; } |
| 81 |
| 82 const GURL& referrer() const { return referrer_; } |
| 83 void set_referrer(const GURL& referrer) { referrer_ = referrer; } |
| 84 |
| 85 private: |
| 86 // The hostname to resolve. |
| 87 std::string hostname_; |
| 88 |
| 89 // The port number to set in the result's sockaddrs. |
| 90 int port_; |
| 91 |
| 92 // Whether it is ok to return a result from the host cache. |
| 93 bool allow_cached_response_; |
| 94 |
| 95 // Whether this request was started by the DNS prefetcher. |
| 96 bool is_speculative_; |
| 97 |
| 98 // Optional data for consumption by observers. This is the URL of the |
| 99 // page that lead us to the navigation, for DNS prefetcher's benefit. |
| 100 GURL referrer_; |
| 101 }; |
| 102 |
61 // Creates a HostResolver that caches up to |max_cache_entries| for | 103 // Creates a HostResolver that caches up to |max_cache_entries| for |
62 // |cache_duration_ms| milliseconds. | 104 // |cache_duration_ms| milliseconds. |
63 // | 105 // |
64 // TODO(eroman): Get rid of the default parameters as it violate google | 106 // TODO(eroman): Get rid of the default parameters as it violate google |
65 // style. This is temporary to help with refactoring. | 107 // style. This is temporary to help with refactoring. |
66 HostResolver(int max_cache_entries = 100, int cache_duration_ms = 60000); | 108 HostResolver(int max_cache_entries = 100, int cache_duration_ms = 60000); |
67 | 109 |
68 // If any completion callbacks are pending when the resolver is destroyed, | 110 // If any completion callbacks are pending when the resolver is destroyed, |
69 // the host resolutions are cancelled, and the completion callbacks will not | 111 // the host resolutions are cancelled, and the completion callbacks will not |
70 // be called. | 112 // be called. |
71 ~HostResolver(); | 113 ~HostResolver(); |
72 | 114 |
73 // Opaque type used to cancel a request. | 115 // Opaque type used to cancel a request. |
74 class Request; | 116 class Request; |
75 | 117 |
76 // Resolves the given hostname (or IP address literal), filling out the | 118 // Resolves the given hostname (or IP address literal), filling out the |
77 // |addresses| object upon success. The |port| parameter will be set as the | 119 // |addresses| object upon success. The |info.port| parameter will be set as |
78 // sin(6)_port field of the sockaddr_in{6} struct. Returns OK if successful | 120 // the sin(6)_port field of the sockaddr_in{6} struct. Returns OK if |
79 // or an error code upon failure. | 121 // successful or an error code upon failure. |
80 // | 122 // |
81 // When callback is null, the operation completes synchronously. | 123 // When callback is null, the operation completes synchronously. |
82 // | 124 // |
83 // When callback is non-null, the operation will be performed asynchronously. | 125 // When callback is non-null, the operation will be performed asynchronously. |
84 // ERR_IO_PENDING is returned if it has been scheduled successfully. Real | 126 // ERR_IO_PENDING is returned if it has been scheduled successfully. Real |
85 // result code will be passed to the completion callback. If |req| is | 127 // result code will be passed to the completion callback. If |req| is |
86 // non-NULL, then |*req| will be filled with a handle to the async request. | 128 // non-NULL, then |*req| will be filled with a handle to the async request. |
87 // This handle is not valid after the request has completed. | 129 // This handle is not valid after the request has completed. |
88 int Resolve(const std::string& hostname, int port, | 130 int Resolve(const RequestInfo& info, AddressList* addresses, |
89 AddressList* addresses, CompletionCallback* callback, | 131 CompletionCallback* callback, Request** req); |
90 Request** req); | |
91 | 132 |
92 // Cancels the specified request. |req| is the handle returned by Resolve(). | 133 // Cancels the specified request. |req| is the handle returned by Resolve(). |
93 // After a request is cancelled, its completion callback will not be called. | 134 // After a request is cancelled, its completion callback will not be called. |
94 void CancelRequest(Request* req); | 135 void CancelRequest(Request* req); |
95 | 136 |
| 137 // Adds an observer to this resolver. The observer will be notified of the |
| 138 // start and completion of all requests (excluding cancellation). |observer| |
| 139 // must remain valid for the duration of this HostResolver's lifetime. |
| 140 void AddObserver(DnsResolutionObserver* observer); |
| 141 |
| 142 // Unregisters an observer previously added by AddObserver(). |
| 143 void RemoveObserver(DnsResolutionObserver* observer); |
| 144 |
96 private: | 145 private: |
97 class Job; | 146 class Job; |
98 typedef std::vector<Request*> RequestsList; | 147 typedef std::vector<Request*> RequestsList; |
99 typedef base::hash_map<std::string, scoped_refptr<Job> > JobMap; | 148 typedef base::hash_map<std::string, scoped_refptr<Job> > JobMap; |
| 149 typedef std::vector<DnsResolutionObserver*> ObserversList; |
100 | 150 |
101 // Adds a job to outstanding jobs list. | 151 // Adds a job to outstanding jobs list. |
102 void AddOutstandingJob(Job* job); | 152 void AddOutstandingJob(Job* job); |
103 | 153 |
104 // Returns the outstanding job for |hostname|, or NULL if there is none. | 154 // Returns the outstanding job for |hostname|, or NULL if there is none. |
105 Job* FindOutstandingJob(const std::string& hostname); | 155 Job* FindOutstandingJob(const std::string& hostname); |
106 | 156 |
107 // Removes |job| from the outstanding jobs list. | 157 // Removes |job| from the outstanding jobs list. |
108 void RemoveOutstandingJob(Job* job); | 158 void RemoveOutstandingJob(Job* job); |
109 | 159 |
110 // Callback for when |job| has completed with |error| and |addrlist|. | 160 // Callback for when |job| has completed with |error| and |addrlist|. |
111 void OnJobComplete(Job* job, int error, const AddressList& addrlist); | 161 void OnJobComplete(Job* job, int error, const AddressList& addrlist); |
112 | 162 |
| 163 // Notify all obsevers of the start of a resolve request. |
| 164 void NotifyObserversStartRequest(int request_id, |
| 165 const RequestInfo& info); |
| 166 |
| 167 // Notify all obsevers of the completion of a resolve request. |
| 168 void NotifyObserversFinishRequest(int request_id, |
| 169 const RequestInfo& info, |
| 170 int error); |
| 171 |
113 // Cache of host resolution results. | 172 // Cache of host resolution results. |
114 HostCache cache_; | 173 HostCache cache_; |
115 | 174 |
116 // Map from hostname to outstanding job. | 175 // Map from hostname to outstanding job. |
117 JobMap jobs_; | 176 JobMap jobs_; |
118 | 177 |
119 // The job that OnJobComplete() is currently processing (needed in case | 178 // The job that OnJobComplete() is currently processing (needed in case |
120 // HostResolver gets deleted from within the callback). | 179 // HostResolver gets deleted from within the callback). |
121 scoped_refptr<Job> cur_completing_job_; | 180 scoped_refptr<Job> cur_completing_job_; |
122 | 181 |
| 182 // The observers to notify when a request starts/ends. |
| 183 ObserversList observers_; |
| 184 |
| 185 // Monotonically increasing ID number to assign to the next request. |
| 186 // Observers are the only consumers of this ID number. |
| 187 int next_request_id_; |
| 188 |
123 DISALLOW_COPY_AND_ASSIGN(HostResolver); | 189 DISALLOW_COPY_AND_ASSIGN(HostResolver); |
124 }; | 190 }; |
125 | 191 |
126 // This class represents the task of resolving a hostname (or IP address | 192 // This class represents the task of resolving a hostname (or IP address |
127 // literal) to an AddressList object. It wraps HostResolver to resolve only a | 193 // literal) to an AddressList object. It wraps HostResolver to resolve only a |
128 // single hostname at a time and cancels this request when going out of scope. | 194 // single hostname at a time and cancels this request when going out of scope. |
129 class SingleRequestHostResolver { | 195 class SingleRequestHostResolver { |
130 public: | 196 public: |
131 explicit SingleRequestHostResolver(HostResolver* resolver); | 197 explicit SingleRequestHostResolver(HostResolver* resolver); |
132 | 198 |
133 // If a completion callback is pending when the resolver is destroyed, the | 199 // If a completion callback is pending when the resolver is destroyed, the |
134 // host resolution is cancelled, and the completion callback will not be | 200 // host resolution is cancelled, and the completion callback will not be |
135 // called. | 201 // called. |
136 ~SingleRequestHostResolver(); | 202 ~SingleRequestHostResolver(); |
137 | 203 |
138 // Resolves the given hostname (or IP address literal), filling out the | 204 // Resolves the given hostname (or IP address literal), filling out the |
139 // |addresses| object upon success. See HostResolver::Resolve() for details. | 205 // |addresses| object upon success. See HostResolver::Resolve() for details. |
140 int Resolve(const std::string& hostname, int port, | 206 int Resolve(const HostResolver::RequestInfo& info, |
141 AddressList* addresses, CompletionCallback* callback); | 207 AddressList* addresses, CompletionCallback* callback); |
142 | 208 |
143 private: | 209 private: |
144 // Callback for when the request to |resolver_| completes, so we dispatch | 210 // Callback for when the request to |resolver_| completes, so we dispatch |
145 // to the user's callback. | 211 // to the user's callback. |
146 void OnResolveCompletion(int result); | 212 void OnResolveCompletion(int result); |
147 | 213 |
148 // The actual host resolver that will handle the request. | 214 // The actual host resolver that will handle the request. |
149 HostResolver* resolver_; | 215 HostResolver* resolver_; |
150 | 216 |
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195 // | 261 // |
196 // NOTE: In most cases, you should use ScopedHostMapper instead, which is | 262 // NOTE: In most cases, you should use ScopedHostMapper instead, which is |
197 // defined in host_resolver_unittest.h | 263 // defined in host_resolver_unittest.h |
198 // | 264 // |
199 HostMapper* SetHostMapper(HostMapper* host_mapper); | 265 HostMapper* SetHostMapper(HostMapper* host_mapper); |
200 #endif | 266 #endif |
201 | 267 |
202 } // namespace net | 268 } // namespace net |
203 | 269 |
204 #endif // NET_BASE_HOST_RESOLVER_H_ | 270 #endif // NET_BASE_HOST_RESOLVER_H_ |
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