src/net/http/http_server_properties.cc

   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.
   4
   5 #include "net/http/http_server_properties.h"
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/strings/stringprintf.h"
  10
  11 namespace net {
  12
  13 const char kAlternateProtocolHeader[] = "Alternate-Protocol";
  14
  15 namespace {
  16
  17 // The order of these strings much match the order of the enum definition
  18 // for AlternateProtocol.
  19 const char* const kAlternateProtocolStrings[] = {
  20   "npn-spdy/2",
  21   "npn-spdy/3",
  22   "npn-spdy/3.1",
  23   "npn-h2-14",  // HTTP/2 draft 14. Called SPDY4 internally.
  24   "quic"
  25 };
  26 const char kBrokenAlternateProtocol[] = "Broken";
  27
  28 COMPILE_ASSERT(
  29     arraysize(kAlternateProtocolStrings) == NUM_VALID_ALTERNATE_PROTOCOLS,
  30     kAlternateProtocolStringsSize_kNumValidAlternateProtocols_not_equal);
  31
  32 }  // namespace
  33
  34 void HistogramAlternateProtocolUsage(
  35     AlternateProtocolUsage usage,
  36     AlternateProtocolExperiment alternate_protocol_experiment) {
  37   UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage", usage,
  38                             ALTERNATE_PROTOCOL_USAGE_MAX);
  39   if (alternate_protocol_experiment ==
  40       ALTERNATE_PROTOCOL_TRUNCATED_200_SERVERS) {
  41     UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage.200Truncated", usage,
  42                               ALTERNATE_PROTOCOL_USAGE_MAX);
  43   } else if (alternate_protocol_experiment ==
  44       ALTERNATE_PROTOCOL_TRUNCATED_1000_SERVERS) {
  45     UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage.1000Truncated", usage,
  46                               ALTERNATE_PROTOCOL_USAGE_MAX);
  47   }
  48 }
  49
  50 void HistogramBrokenAlternateProtocolLocation(
  51     BrokenAlternateProtocolLocation location){
  52   UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolBrokenLocation", location,
  53                             BROKEN_ALTERNATE_PROTOCOL_LOCATION_MAX);
  54 }
  55
  56 bool IsAlternateProtocolValid(AlternateProtocol protocol) {
  57   return protocol >= ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION &&
  58       protocol <= ALTERNATE_PROTOCOL_MAXIMUM_VALID_VERSION;
  59 }
  60
  61 const char* AlternateProtocolToString(AlternateProtocol protocol) {
  62   switch (protocol) {
  63     case DEPRECATED_NPN_SPDY_2:
  64     case NPN_SPDY_3:
  65     case NPN_SPDY_3_1:
  66     case NPN_SPDY_4:
  67     case QUIC:
  68       DCHECK(IsAlternateProtocolValid(protocol));
  69       return kAlternateProtocolStrings[
  70           protocol - ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION];
  71     case ALTERNATE_PROTOCOL_BROKEN:
  72       return kBrokenAlternateProtocol;
  73     case UNINITIALIZED_ALTERNATE_PROTOCOL:
  74       return "Uninitialized";
  75   }
  76   NOTREACHED();
  77   return "";
  78 }
  79
  80 AlternateProtocol AlternateProtocolFromString(const std::string& str) {
  81   for (int i = ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION;
  82        i <= ALTERNATE_PROTOCOL_MAXIMUM_VALID_VERSION; ++i) {
  83     AlternateProtocol protocol = static_cast<AlternateProtocol>(i);
  84     if (str == AlternateProtocolToString(protocol))
  85       return protocol;
  86   }
  87   if (str == kBrokenAlternateProtocol)
  88     return ALTERNATE_PROTOCOL_BROKEN;
  89   return UNINITIALIZED_ALTERNATE_PROTOCOL;
  90 }
  91
  92 AlternateProtocol AlternateProtocolFromNextProto(NextProto next_proto) {
  93   switch (next_proto) {
  94     case kProtoDeprecatedSPDY2:
  95       return DEPRECATED_NPN_SPDY_2;
  96     case kProtoSPDY3:
  97       return NPN_SPDY_3;
  98     case kProtoSPDY31:
  99       return NPN_SPDY_3_1;
 100     case kProtoSPDY4:
 101       return NPN_SPDY_4;
 102     case kProtoQUIC1SPDY3:
 103       return QUIC;
 104
 105     case kProtoUnknown:
 106     case kProtoHTTP11:
 107       break;
 108   }
 109
 110   NOTREACHED() << "Invalid NextProto: " << next_proto;
 111   return UNINITIALIZED_ALTERNATE_PROTOCOL;
 112 }
 113
 114 std::string AlternateProtocolInfo::ToString() const {
 115   return base::StringPrintf("%d:%s p=%f", port,
 116                             AlternateProtocolToString(protocol),
 117                             probability);
 118 }
 119
 120 }  // namespace net