QUIC - Record reject reasons for CHLO message.

net/quic/crypto/quic_crypto_client_config.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/quic/crypto/quic_crypto_client_config.h"
 
+#include "base/metrics/sparse_histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "net/quic/crypto/cert_compressor.h"
 #include "net/quic/crypto/chacha20_poly1305_encrypter.h"
 #include "net/quic/crypto/channel_id.h"
 #include "net/quic/crypto/common_cert_set.h"
 #include "net/quic/crypto/crypto_framer.h"
 #include "net/quic/crypto/crypto_utils.h"
 #include "net/quic/crypto/curve25519_key_exchange.h"
 #include "net/quic/crypto/key_exchange.h"
@@ skipping 568 matching lines @@
       *error_details = "Proof missing";
       return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
     }
   }
 
   const uint32* reject_reasons;
   size_t num_reject_reasons;
   COMPILE_ASSERT(sizeof(QuicTag) == sizeof(uint32), header_out_of_sync);
   if (rej.GetTaglist(kRREJ, &reject_reasons,
                      &num_reject_reasons) == QUIC_NO_ERROR) {
-#if defined(DEBUG)
     uint32 packed_error = 0;
     for (size_t i = 0; i < num_reject_reasons; ++i) {
       // HANDSHAKE_OK is 0 and don't report that as error.
       if (reject_reasons[i] == HANDSHAKE_OK || reject_reasons[i] >= 32) {
         continue;
       }
       HandshakeFailureReason reason =
           static_cast<HandshakeFailureReason>(reject_reasons[i]);
       packed_error |= 1 << (reason - 1);
     }
     DVLOG(1) << "Reasons for rejection: " << packed_error;
-#endif
+    UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicClientHelloRejectReasons",
+                                packed_error);
   }
 
   return QUIC_NO_ERROR;
 }
 
 QuicErrorCode QuicCryptoClientConfig::ProcessServerHello(
     const CryptoHandshakeMessage& server_hello,
     QuicConnectionId connection_id,
     const QuicVersionVector& negotiated_versions,
     CachedState* cached,
@@ skipping 146 matching lines @@
     return;
   }
 
   // Update canonical version to point at the "most recent" entry.
   canonical_server_map_[suffix_server_id] = server_id;
 
   server_state->InitializeFrom(*canonical_state);
 }
 
 }  // namespace net