Function get_ssl_session_cache_config

src/iocore/net/SSLConfig.cc:128–174

Determines the SSL session cache configuration value using a priority-based selection scheme. * * This function resolves the SSL session cache configuration by evaluating multiple potential * configuration sources and selecting the one with the highest priority. The priority calculation * combines two factors: * * Configuration Name Priority (base priority): * - `proxy.config.ssl.session_ca

 * @return The SSL session cache mode value.
 */
static int
get_ssl_session_cache_config()
{
  //
  // TODO: in 11.x, we can simply remove this function and use only proxy.config.ssl.session_cache.mode.
  //

  struct ConfigOption {
    const char *name;     ///< Configuration parameter name (e.g., "proxy.config.ssl.session_cache.mode").
    int         value;    ///< The configured value if explicitly set.
    int         priority; ///< The inherit priority of the config name, higher is more preferred.
  };

  /// The priority of the source. Higher is more preferred.
  std::unordered_map<int, int> source_priorities = {
    {REC_SOURCE_ENV,      0x30},
    {REC_SOURCE_EXPLICIT, 0x20},
    {REC_SOURCE_PLUGIN,   0x10},
    {REC_SOURCE_DEFAULT,  0x0 },
    {REC_SOURCE_NULL,     0x0 }, // For completeness, no record should have this set.
  };

  std::array<ConfigOption, 3> configs = {
    {
     {"proxy.config.ssl.session_cache.mode", 0, 0x3},
     {"proxy.config.ssl.session_cache.value", 0, 0x2},
     {"proxy.config.ssl.session_cache.enabled", 0, 0x1},
     }
  };

  // Loop over the config names, updating their priority score per their source.
  auto *highest_priority_config = &configs[0];
  for (auto &config : configs) {
    RecSourceT source;
    if (RecGetRecordSource(config.name, &source) == REC_ERR_OKAY) {
      config.priority += source_priorities[source];
      REC_ReadConfigInteger(config.value, config.name);
      if (config.priority > highest_priority_config->priority) {
        highest_priority_config = &config;
      }
    } else {
      // We need to update our logic here if any of these configs are removed.
      ink_release_assert(false);
    }
  }
  return highest_priority_config->value;
}

SSLConfigParams::SSLConfigParams()
{