Bypassed Bytes UMAs

components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h b/components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h
index 6c217b2f5768bdba67c736494cee83e2629dc718..e6f60a7429c66cca17f40e8d7899b86e7254b519 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h
@@ -6,10 +6,12 @@
 #define COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_USAGE_STATS_H_
 
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/prefs/pref_member.h"
 #include "base/threading/thread_checker.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/network_change_notifier.h"
+#include "net/proxy/proxy_service.h"
 
 namespace data_reduction_proxy {
 
@@ -23,20 +25,49 @@ class DataReductionProxyUsageStats
                                base::MessageLoopProxy* io_thread_proxy);
   virtual ~DataReductionProxyUsageStats();
 
-  /**
-   * Callback intended to be called from |ChromeNetworkDelegate| when a
-   * request completes. This method is used to gather usage stats.
-   */
+  // Callback intended to be called from |ChromeNetworkDelegate| when a
+  // request completes. This method is used to gather usage stats.
   void OnUrlRequestCompleted(const net::URLRequest* request, bool started);
 
-  /**
-   * Determines whether the data reduction proxy is unreachable.
-   * Returns true if data reduction proxy is unreachable.
-   */
+  // Determines whether the data reduction proxy is unreachable.
+  // Returns true if data reduction proxy is unreachable.
   bool isDataReductionProxyUnreachable();
 
+  // Records the last bypass reason to |bypass_type_| and sets
+  // |triggering_request_| to true.
+  void SetBypassType(net::ProxyService::DataReductionProxyBypassType type);
+
+  // Records the number of bypassed bytes for various bypass reasons into their
+  // respective UMAs.
+  void RecordBypassedBytesHistograms(
+      const int64 content_length,

[Alexei Svitkine (slow), 2014/07/15 18:20:08]

Nit: No need for const on primitives.

Also, is this param necessary or can this function simply get its value via
request->received_response_content_length()?

+      const net::URLRequest* request,

[Alexei Svitkine (slow), 2014/07/15 18:20:08]

If |request| can never be NULL, which seems to be the case here, pass by const
ref instead.

[megjablon, 2014/07/16 00:00:59]

Done.

+      const BooleanPrefMember* data_reduction_proxy_enabled);
+
  private:
+  enum DataReductionProxyBypassedBytesType {
+    // Not bypassed.
+    NOT_BYPASSED = 0,
+
+    // Bypass due to SSL.
+    SSL,
+
+    // Bypass due to client-side bypass rules.
+    LOCAL_BYPASS_RULES,
+
+    // Audio/Video bypass.
+    AUDIO_VIDEO,
+
+    // Triggering request bypass.
+    TRIGGERING_REQUEST,
+
+    // This must always be last.
+    BYPASSED_BYTES_TYPE_MAX
+  };
+
   DataReductionProxyParams* data_reduction_proxy_params_;
+  net::ProxyService::DataReductionProxyBypassType bypass_type_;
+  bool triggering_request_;
   base::MessageLoopProxy* ui_thread_proxy_;
   base::MessageLoopProxy* io_thread_proxy_;
 
@@ -63,6 +94,16 @@ class DataReductionProxyUsageStats
 
   base::ThreadChecker thread_checker_;
 
+  void RecordTriggeringRequestBypassedBytes(
+      net::ProxyService::DataReductionProxyBypassType bypass_type,
+      int64 content_length);
+  void RecordNetworkErrorBypassedBytes(const net::URLRequest* request,

[Alexei Svitkine (slow), 2014/07/15 18:20:08]

Nit: Pass by const ref?

[megjablon, 2014/07/16 00:00:59]

We moved this logic into RecordBypassedBytes, deleted.

+                                       int64 content_length);
+  void RecordBypassedBytes(
+      net::ProxyService::DataReductionProxyBypassType bypass_type,
+      DataReductionProxyBypassedBytesType bypassed_bytes_type,
+      int64 content_length);
+
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyUsageStats);
 };