Add Net.WebSocket.ResponseCode and ErrorCodes UMA

net/websockets/websocket_basic_handshake_stream.cc

 // Copyright 2013 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.
 
 #include "net/websockets/websocket_basic_handshake_stream.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/base64.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/containers/hash_tables.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "crypto/random.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_body_drainer.h"
@@ skipping 517 matching lines @@
                                            headers->response_code(),
                                            headers->GetStatusText(),
                                            headers,
                                            http_response_info_->response_time));
     connect_delegate_->OnFinishOpeningHandshake(response.Pass());
   }
 }
 
 int WebSocketBasicHandshakeStream::ValidateResponse(int rv) {
   DCHECK(http_response_info_);
-  const HttpResponseHeaders* headers = http_response_info_->headers.get();
+  // Most net errors happen during connection, so they are not seen by this
+  // method. The histogram for error codes is created in
+  // Delegate::OnResponseStarted in websocket_stream.cc instead.
   if (rv >= 0) {
-    switch (headers->response_code()) {
+    const HttpResponseHeaders* headers = http_response_info_->headers.get();
+    const int response_code = headers->response_code();
+    UMA_HISTOGRAM_SPARSE_SLOWLY("Net.WebSocket.ResponseCode", response_code);
+    switch (response_code) {
       case HTTP_SWITCHING_PROTOCOLS:
         OnFinishOpeningHandshake();
         return ValidateUpgradeResponse(headers);
 
       // We need to pass these through for authentication to work.
       case HTTP_UNAUTHORIZED:
       case HTTP_PROXY_AUTHENTICATION_REQUIRED:
         return OK;
 
       // Other status codes are potentially risky (see the warnings in the
@@ skipping 44 matching lines @@
                          &extensions_,
                          &failure_message_,
                          extension_params_.get())) {
     return OK;
   }
   failure_message_ = "Error during WebSocket handshake: " + failure_message_;
   return ERR_INVALID_RESPONSE;
 }
 
 }  // namespace net