Per-renderer WebSocket throttling

content/browser/renderer_host/websocket_dispatcher_host.h

Index: content/browser/renderer_host/websocket_dispatcher_host.h
diff --git a/content/browser/renderer_host/websocket_dispatcher_host.h b/content/browser/renderer_host/websocket_dispatcher_host.h
index b9cdd343837ea2e57429adf1933455d5e2f84151..95ef4c38919cdbcd2afc3157f1a62809a05e0649 100644
--- a/content/browser/renderer_host/websocket_dispatcher_host.h
+++ b/content/browser/renderer_host/websocket_dispatcher_host.h
@@ -12,6 +12,8 @@
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
 #include "content/common/content_export.h"
 #include "content/common/websocket.h"
 #include "content/public/browser/browser_message_filter.h"
@@ -32,9 +34,10 @@ class CONTENT_EXPORT WebSocketDispatcherHost : public BrowserMessageFilter {
  public:
   typedef base::Callback<net::URLRequestContext*()> GetRequestContextCallback;
 
-  // Given a routing_id, WebSocketHostFactory returns a new instance of
-  // WebSocketHost or its subclass.
-  typedef base::Callback<WebSocketHost*(int)> WebSocketHostFactory;  // NOLINT
+  // Given a routing_id and delay, WebSocketHostFactory returns a new
+  // instance of WebSocketHost or its subclass.
+  typedef base::Callback<WebSocketHost*(int, base::TimeDelta)>
+      WebSocketHostFactory;
 
   // Return value for methods that may delete the WebSocketHost. This enum is
   // binary-compatible with net::WebSocketEventInterface::ChannelState, to make
@@ -118,7 +121,7 @@ class CONTENT_EXPORT WebSocketDispatcherHost : public BrowserMessageFilter {
 
   ~WebSocketDispatcherHost() override;
 
-  WebSocketHost* CreateWebSocketHost(int routing_id);
+  WebSocketHost* CreateWebSocketHost(int routing_id, base::TimeDelta delay);
 
   // Looks up a WebSocketHost object by |routing_id|. Returns the object if one
   // is found, or NULL otherwise.
@@ -134,6 +137,11 @@ class CONTENT_EXPORT WebSocketDispatcherHost : public BrowserMessageFilter {
   // removes it from the |hosts_| table.
   void DeleteWebSocketHost(int routing_id);
 
+  // Calculate delay for per-renderer WebSocket throttling.
+  base::TimeDelta CalculateDelay() const;
+
+  void FinishThrottlingPeriod();
+
   // Table of WebSocketHost objects, owned by this object, indexed by
   // routing_id.
   WebSocketHostTable hosts_;
@@ -147,6 +155,19 @@ class CONTENT_EXPORT WebSocketDispatcherHost : public BrowserMessageFilter {
 
   WebSocketHostFactory websocket_host_factory_;
 
+  // Timer and counters for per-renderer WebSocket throttling.
+  base::RepeatingTimer<WebSocketDispatcherHost> timer_;
+  // The current number of pending connections.
+  int num_pending_connections_;
+  // The number of handshakes that failed in the current and previous time
+  // period.
+  int64 num_current_succeeded_connections_;

[Adam Rice, 2015/03/04 08:20:50]

It seems this type should be written int64_t (this style change was made 2 years
ago and I didn't notice until today!).

We need to #include <stdint.h> and probably remove "base/basictypes.h".

[hiroshige, 2015/03/04 11:13:15]

Done.

+  int64 num_previous_succeeded_connections_;
+  // The number of handshakes that succeeded in the current and previous time
+  // period.
+  int64 num_current_failed_connections_;
+  int64 num_previous_failed_connections_;
+
   DISALLOW_COPY_AND_ASSIGN(WebSocketDispatcherHost);
 };