1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // This is the browser side of the resource dispatcher, it receives requests
6 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
7 // dispatches them to URLRequests. It then forwards the messages from the
8 // URLRequests back to the correct process for handling.
10 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
12 #ifndef CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_
13 #define CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_
20 #include "base/basictypes.h"
21 #include "base/gtest_prod_util.h"
22 #include "base/memory/linked_ptr.h"
23 #include "base/memory/scoped_ptr.h"
24 #include "base/observer_list.h"
25 #include "base/time/time.h"
26 #include "base/timer/timer.h"
27 #include "content/browser/download/download_resource_handler.h"
28 #include "content/browser/loader/global_routing_id.h"
29 #include "content/browser/loader/offline_policy.h"
30 #include "content/browser/loader/resource_loader.h"
31 #include "content/browser/loader/resource_loader_delegate.h"
32 #include "content/browser/loader/resource_scheduler.h"
33 #include "content/common/content_export.h"
34 #include "content/public/browser/child_process_data.h"
35 #include "content/public/browser/download_item.h"
36 #include "content/public/browser/download_url_parameters.h"
37 #include "content/public/browser/global_request_id.h"
38 #include "content/public/browser/notification_types.h"
39 #include "content/public/browser/resource_dispatcher_host.h"
40 #include "ipc/ipc_message.h"
41 #include "net/cookies/canonical_cookie.h"
42 #include "net/url_request/url_request.h"
43 #include "webkit/common/resource_type.h"
45 class ResourceHandler;
46 struct ResourceHostMsg_Request;
49 class URLRequestJobFactory;
52 namespace webkit_blob {
53 class ShareableFileReference;
57 class ResourceContext;
58 class ResourceDispatcherHostDelegate;
59 class ResourceMessageDelegate;
60 class ResourceMessageFilter;
61 class ResourceRequestInfoImpl;
62 class SaveFileManager;
63 class WebContentsImpl;
64 struct DownloadSaveInfo;
67 class CONTENT_EXPORT ResourceDispatcherHostImpl
68 : public ResourceDispatcherHost,
69 public ResourceLoaderDelegate {
71 ResourceDispatcherHostImpl();
72 virtual ~ResourceDispatcherHostImpl();
74 // Returns the current ResourceDispatcherHostImpl. May return NULL if it
75 // hasn't been created yet.
76 static ResourceDispatcherHostImpl* Get();
78 // ResourceDispatcherHost implementation:
79 virtual void SetDelegate(ResourceDispatcherHostDelegate* delegate) OVERRIDE;
80 virtual void SetAllowCrossOriginAuthPrompt(bool value) OVERRIDE;
81 virtual DownloadInterruptReason BeginDownload(
82 scoped_ptr<net::URLRequest> request,
83 const Referrer& referrer,
84 bool is_content_initiated,
85 ResourceContext* context,
89 scoped_ptr<DownloadSaveInfo> save_info,
91 const DownloadStartedCallback& started_callback) OVERRIDE;
92 virtual void ClearLoginDelegateForRequest(net::URLRequest* request) OVERRIDE;
93 virtual void BlockRequestsForRoute(int child_id, int route_id) OVERRIDE;
94 virtual void ResumeBlockedRequestsForRoute(
95 int child_id, int route_id) OVERRIDE;
97 // Puts the resource dispatcher host in an inactive state (unable to begin
98 // new requests). Cancels all pending requests.
101 // Notify the ResourceDispatcherHostImpl of a new resource context.
102 void AddResourceContext(ResourceContext* context);
104 // Notify the ResourceDispatcherHostImpl of a resource context destruction.
105 void RemoveResourceContext(ResourceContext* context);
107 // Force cancels any pending requests for the given |context|. This is
108 // necessary to ensure that before |context| goes away, all requests
110 void CancelRequestsForContext(ResourceContext* context);
112 // Returns true if the message was a resource message that was processed.
113 // If it was, message_was_ok will be false iff the message was corrupt.
114 bool OnMessageReceived(const IPC::Message& message,
115 ResourceMessageFilter* filter,
116 bool* message_was_ok);
118 // Initiates a save file from the browser process (as opposed to a resource
119 // request from the renderer or another child process).
120 void BeginSaveFile(const GURL& url,
121 const Referrer& referrer,
124 ResourceContext* context);
126 // Cancels the given request if it still exists.
127 void CancelRequest(int child_id, int request_id);
129 // Marks the request as "parked". This happens if a request is
130 // redirected cross-site and needs to be resumed by a new render view.
131 void MarkAsTransferredNavigation(const GlobalRequestID& id);
133 // Cancels a request previously marked as being transferred, for use when a
134 // navigation was cancelled.
135 void CancelTransferringNavigation(const GlobalRequestID& id);
137 // Resumes the request without transferring it to a new render view.
138 void ResumeDeferredNavigation(const GlobalRequestID& id);
140 // Returns the number of pending requests. This is designed for the unittests
141 int pending_requests() const {
142 return static_cast<int>(pending_loaders_.size());
145 // Intended for unit-tests only. Overrides the outstanding requests bound.
146 void set_max_outstanding_requests_cost_per_process(int limit) {
147 max_outstanding_requests_cost_per_process_ = limit;
149 void set_max_num_in_flight_requests_per_process(int limit) {
150 max_num_in_flight_requests_per_process_ = limit;
152 void set_max_num_in_flight_requests(int limit) {
153 max_num_in_flight_requests_ = limit;
156 // The average private bytes increase of the browser for each new pending
157 // request. Experimentally obtained.
158 static const int kAvgBytesPerOutstandingRequest = 4400;
160 SaveFileManager* save_file_manager() const {
161 return save_file_manager_.get();
164 // Called when a RenderViewHost is created.
165 void OnRenderViewHostCreated(int child_id, int route_id);
167 // Called when a RenderViewHost is deleted.
168 void OnRenderViewHostDeleted(int child_id, int route_id);
170 // Force cancels any pending requests for the given process.
171 void CancelRequestsForProcess(int child_id);
173 void OnUserGesture(WebContentsImpl* contents);
175 // Retrieves a net::URLRequest. Must be called from the IO thread.
176 net::URLRequest* GetURLRequest(const GlobalRequestID& request_id);
178 void RemovePendingRequest(int child_id, int request_id);
180 // Cancels any blocked request for the specified route id.
181 void CancelBlockedRequestsForRoute(int child_id, int route_id);
183 // Maintains a collection of temp files created in support of
184 // the download_to_file capability. Used to grant access to the
185 // child process and to defer deletion of the file until it's
187 void RegisterDownloadedTempFile(
188 int child_id, int request_id,
189 webkit_blob::ShareableFileReference* reference);
190 void UnregisterDownloadedTempFile(int child_id, int request_id);
192 // Needed for the sync IPC message dispatcher macros.
193 bool Send(IPC::Message* message);
195 // Indicates whether third-party sub-content can pop-up HTTP basic auth
197 bool allow_cross_origin_auth_prompt();
199 ResourceDispatcherHostDelegate* delegate() {
203 // Must be called after the ResourceRequestInfo has been created
204 // and associated with the request.
205 // |id| should be |content::DownloadItem::kInvalidId| to request automatic
207 scoped_ptr<ResourceHandler> CreateResourceHandlerForDownload(
208 net::URLRequest* request,
209 bool is_content_initiated,
212 scoped_ptr<DownloadSaveInfo> save_info,
213 const DownloadUrlParameters::OnStartedCallback& started_cb);
215 // Must be called after the ResourceRequestInfo has been created
216 // and associated with the request.
217 scoped_ptr<ResourceHandler> MaybeInterceptAsStream(
218 net::URLRequest* request,
219 ResourceResponse* response);
221 void ClearSSLClientAuthHandlerForRequest(net::URLRequest* request);
223 ResourceScheduler* scheduler() { return scheduler_.get(); }
225 // Called by a ResourceHandler when it's ready to start reading data and
226 // sending it to the renderer. Returns true if there are enough file
227 // descriptors available for the shared memory buffer. If false is returned,
228 // the request should cancel.
229 bool HasSufficientResourcesForRequest(const net::URLRequest* request_);
231 // Called by a ResourceHandler after it has finished its request and is done
232 // using its shared memory buffer. Frees up that file descriptor to be used
234 void FinishedWithResourcesForRequest(const net::URLRequest* request_);
237 friend class ResourceDispatcherHostTest;
239 FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
240 TestBlockedRequestsProcessDies);
241 FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
242 CalculateApproximateMemoryCost);
243 FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
244 DetachableResourceTimesOut);
245 FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
246 TestProcessCancelDetachableTimesOut);
250 struct OustandingRequestsStats {
255 friend class ShutdownTask;
256 friend class ResourceMessageDelegate;
258 // ResourceLoaderDelegate implementation:
259 virtual ResourceDispatcherHostLoginDelegate* CreateLoginDelegate(
260 ResourceLoader* loader,
261 net::AuthChallengeInfo* auth_info) OVERRIDE;
262 virtual bool HandleExternalProtocol(ResourceLoader* loader,
263 const GURL& url) OVERRIDE;
264 virtual void DidStartRequest(ResourceLoader* loader) OVERRIDE;
265 virtual void DidReceiveRedirect(ResourceLoader* loader,
266 const GURL& new_url) OVERRIDE;
267 virtual void DidReceiveResponse(ResourceLoader* loader) OVERRIDE;
268 virtual void DidFinishLoading(ResourceLoader* loader) OVERRIDE;
270 // An init helper that runs on the IO thread.
273 // A shutdown helper that runs on the IO thread.
276 // Helper function for regular and download requests.
277 void BeginRequestInternal(scoped_ptr<net::URLRequest> request,
278 scoped_ptr<ResourceHandler> handler);
280 void StartLoading(ResourceRequestInfoImpl* info,
281 const linked_ptr<ResourceLoader>& loader);
283 // We keep track of how much memory each request needs and how many requests
284 // are issued by each renderer. These are known as OustandingRequestStats.
285 // Memory limits apply to all requests sent to us by the renderers. There is a
286 // limit for each renderer. File descriptor limits apply to requests that are
287 // receiving their body. These are known as in-flight requests. There is a
288 // global limit that applies for the browser process. Each render is allowed
289 // to use up to a fraction of that.
291 // Returns the OustandingRequestsStats for |info|'s renderer, or an empty
292 // struct if that renderer has no outstanding requests.
293 OustandingRequestsStats GetOutstandingRequestsStats(
294 const ResourceRequestInfoImpl& info);
296 // Updates |outstanding_requests_stats_map_| with the specified |stats| for
297 // the renderer that made the request in |info|.
298 void UpdateOutstandingRequestsStats(const ResourceRequestInfoImpl& info,
299 const OustandingRequestsStats& stats);
301 // Called every time an outstanding request is created or deleted. |count|
302 // indicates whether the request is new or deleted. |count| must be 1 or -1.
303 OustandingRequestsStats IncrementOutstandingRequestsMemory(
305 const ResourceRequestInfoImpl& info);
307 // Called every time an in flight request is issued or finished. |count|
308 // indicates whether the request is issuing or finishing. |count| must be 1
310 OustandingRequestsStats IncrementOutstandingRequestsCount(
312 const ResourceRequestInfoImpl& info);
314 // Estimate how much heap space |request| will consume to run.
315 static int CalculateApproximateMemoryCost(net::URLRequest* request);
317 // Force cancels any pending requests for the given route id. This method
318 // acts like CancelRequestsForProcess when route_id is -1.
319 void CancelRequestsForRoute(int child_id, int route_id);
321 // The list of all requests that we have pending. This list is not really
322 // optimized, and assumes that we have relatively few requests pending at once
323 // since some operations require brute-force searching of the list.
325 // It may be enhanced in the future to provide some kind of prioritization
326 // mechanism. We should also consider a hashtable or binary tree if it turns
327 // out we have a lot of things here.
328 typedef std::map<GlobalRequestID, linked_ptr<ResourceLoader> > LoaderMap;
330 // Deletes the pending request identified by the iterator passed in.
331 // This function will invalidate the iterator passed in. Callers should
332 // not rely on this iterator being valid on return.
333 void RemovePendingLoader(const LoaderMap::iterator& iter);
335 // Checks all pending requests and updates the load states and upload
336 // progress if necessary.
337 void UpdateLoadStates();
339 // Resumes or cancels (if |cancel_requests| is true) any blocked requests.
340 void ProcessBlockedRequestsForRoute(int child_id,
342 bool cancel_requests);
344 void OnRequestResource(const IPC::Message& msg,
346 const ResourceHostMsg_Request& request_data);
347 void OnSyncLoad(int request_id,
348 const ResourceHostMsg_Request& request_data,
349 IPC::Message* sync_result);
351 // Update the ResourceRequestInfo and internal maps when a request is
352 // transferred from one process to another.
353 void UpdateRequestForTransfer(int child_id,
356 const ResourceHostMsg_Request& request_data,
357 const linked_ptr<ResourceLoader>& loader);
359 void BeginRequest(int request_id,
360 const ResourceHostMsg_Request& request_data,
361 IPC::Message* sync_result, // only valid for sync
362 int route_id); // only valid for async
364 // Creates a ResourceHandler to be used by BeginRequest() for normal resource
366 scoped_ptr<ResourceHandler> CreateResourceHandler(
367 net::URLRequest* request,
368 const ResourceHostMsg_Request& request_data,
369 IPC::Message* sync_result,
373 ResourceContext* resource_context);
375 void OnDataDownloadedACK(int request_id);
376 void OnUploadProgressACK(int request_id);
377 void OnCancelRequest(int request_id);
378 void OnReleaseDownloadedFile(int request_id);
380 // Creates ResourceRequestInfoImpl for a download or page save.
381 // |download| should be true if the request is a file download.
382 ResourceRequestInfoImpl* CreateRequestInfo(
386 ResourceContext* context);
388 // Relationship of resource being authenticated with the top level page.
389 enum HttpAuthRelationType {
390 HTTP_AUTH_RELATION_TOP, // Top-level page itself
391 HTTP_AUTH_RELATION_SAME_DOMAIN, // Sub-content from same domain
392 HTTP_AUTH_RELATION_BLOCKED_CROSS, // Blocked Sub-content from cross domain
393 HTTP_AUTH_RELATION_ALLOWED_CROSS, // Allowed Sub-content per command line
394 HTTP_AUTH_RELATION_LAST
397 HttpAuthRelationType HttpAuthRelationTypeOf(const GURL& request_url,
398 const GURL& first_party);
400 // Returns whether the URLRequest identified by |transferred_request_id| is
401 // currently in the process of being transferred to a different renderer.
402 // This happens if a request is redirected cross-site and needs to be resumed
403 // by a new render view.
404 bool IsTransferredNavigation(
405 const GlobalRequestID& transferred_request_id) const;
407 ResourceLoader* GetLoader(const GlobalRequestID& id) const;
408 ResourceLoader* GetLoader(int child_id, int request_id) const;
410 // Registers |delegate| to receive resource IPC messages targeted to the
412 void RegisterResourceMessageDelegate(const GlobalRequestID& id,
413 ResourceMessageDelegate* delegate);
414 void UnregisterResourceMessageDelegate(const GlobalRequestID& id,
415 ResourceMessageDelegate* delegate);
417 int BuildLoadFlagsForRequest(const ResourceHostMsg_Request& request_data,
421 LoaderMap pending_loaders_;
423 // Collection of temp files downloaded for child processes via
424 // the download_to_file mechanism. We avoid deleting them until
425 // the client no longer needs them.
426 typedef std::map<int, scoped_refptr<webkit_blob::ShareableFileReference> >
427 DeletableFilesMap; // key is request id
428 typedef std::map<int, DeletableFilesMap>
429 RegisteredTempFiles; // key is child process id
430 RegisteredTempFiles registered_temp_files_;
432 // A timer that periodically calls UpdateLoadStates while pending_requests_
434 scoped_ptr<base::RepeatingTimer<ResourceDispatcherHostImpl> >
435 update_load_states_timer_;
437 // We own the save file manager.
438 scoped_refptr<SaveFileManager> save_file_manager_;
440 // Request ID for browser initiated requests. request_ids generated by
441 // child processes are counted up from 0, while browser created requests
442 // start at -2 and go down from there. (We need to start at -2 because -1 is
443 // used as a special value all over the resource_dispatcher_host for
444 // uninitialized variables.) This way, we no longer have the unlikely (but
445 // observed in the real world!) event where we have two requests with the same
449 // True if the resource dispatcher host has been shut down.
452 typedef std::vector<linked_ptr<ResourceLoader> > BlockedLoadersList;
453 typedef std::map<GlobalRoutingID, BlockedLoadersList*> BlockedLoadersMap;
454 BlockedLoadersMap blocked_loaders_map_;
456 // Maps the child_ids to the approximate number of bytes
457 // being used to service its resource requests. No entry implies 0 cost.
458 typedef std::map<int, OustandingRequestsStats> OutstandingRequestsStatsMap;
459 OutstandingRequestsStatsMap outstanding_requests_stats_map_;
461 // |num_in_flight_requests_| is the total number of requests currently issued
462 // summed across all renderers.
463 int num_in_flight_requests_;
465 // |max_num_in_flight_requests_| is the upper bound on how many requests
466 // can be in flight at once. It's based on the maximum number of file
467 // descriptors open per process. We need a global limit for the browser
469 int max_num_in_flight_requests_;
471 // |max_num_in_flight_requests_| is the upper bound on how many requests
472 // can be issued at once. It's based on the maximum number of file
473 // descriptors open per process. We need a per-renderer limit so that no
474 // single renderer can hog the browser's limit.
475 int max_num_in_flight_requests_per_process_;
477 // |max_outstanding_requests_cost_per_process_| is the upper bound on how
478 // many outstanding requests can be issued per child process host.
479 // The constraint is expressed in terms of bytes (where the cost of
480 // individual requests is given by CalculateApproximateMemoryCost).
481 // The total number of outstanding requests is roughly:
482 // (max_outstanding_requests_cost_per_process_ /
483 // kAvgBytesPerOutstandingRequest)
484 int max_outstanding_requests_cost_per_process_;
486 // Time of the last user gesture. Stored so that we can add a load
487 // flag to requests occurring soon after a gesture to indicate they
488 // may be because of explicit user action.
489 base::TimeTicks last_user_gesture_time_;
491 // Used during IPC message dispatching so that the handlers can get a pointer
492 // to the source of the message.
493 ResourceMessageFilter* filter_;
495 ResourceDispatcherHostDelegate* delegate_;
497 bool allow_cross_origin_auth_prompt_;
499 // http://crbug.com/90971 - Assists in tracking down use-after-frees on
501 std::set<const ResourceContext*> active_resource_contexts_;
503 typedef std::map<GlobalRequestID,
504 ObserverList<ResourceMessageDelegate>*> DelegateMap;
505 DelegateMap delegate_map_;
507 scoped_ptr<ResourceScheduler> scheduler_;
509 typedef std::map<GlobalRoutingID, OfflinePolicy*> OfflineMap;
511 OfflineMap offline_policy_map_;
513 DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
516 } // namespace content
518 #endif // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_