Method getHashKey

src/proxy/http/remap/NextHopConsistentHash.cc:168–271

returns a hash key calculated from the request and 'hash_key' configuration parameter.

// returns a hash key calculated from the request and 'hash_key' configuration
// parameter.
uint64_t
NextHopConsistentHash::getHashKey(uint64_t sm_id, const HttpRequestData &hrdata, ATSHash64 *h)
{
  URL        *url            = nullptr;
  int         len            = 0;
  const char *url_string_ref = nullptr;

  switch (hash_url) {
  case NH_HASH_URL_REQUEST:
    break;
  case NH_HASH_URL_CACHE:
    if (hrdata.cache_info_lookup_url) {
      url = *(hrdata.cache_info_lookup_url);
    }
    break;
  case NH_HASH_URL_PARENT:
    if (hrdata.cache_info_parent_selection_url) {
      url = *(hrdata.cache_info_parent_selection_url);
    }
    break;
  }

  // Make sure we default to the request URL if nothing else worked
  if (!url) {
    url = hrdata.hdr->url_get();
  }

  // calculate a hash using the selected config.
  switch (hash_key) {
  case NH_URL_HASH_KEY:
    url_string_ref = url->string_get_ref(&len, URLNormalize::LC_SCHEME_HOST);
    if (url_string_ref && len > 0) {
      h->update(url_string_ref, len);
      NH_Dbg(NH_DBG_CTL, "[%" PRIu64 "] url hash string: %s", sm_id, url_string_ref);
    }
    break;
  // hostname hash
  case NH_HOSTNAME_HASH_KEY:
    url_string_ref = url->host_get(&len);
    if (url_string_ref && len > 0) {
      h->update(url_string_ref, len);
    }
    break;
  // path + query string
  case NH_PATH_QUERY_HASH_KEY:
    url_string_ref = url->path_get(&len);
    h->update("/", 1);
    if (url_string_ref && len > 0) {
      h->update(url_string_ref, len);
    }
    url_string_ref = url->query_get(&len);
    if (url_string_ref && len > 0) {
      h->update("?", 1);
      h->update(url_string_ref, len);
    }
    break;
  // path + fragment hash
  case NH_PATH_FRAGMENT_HASH_KEY: