Function getDescriptionFromUrl

plugins/experimental/rate_limit/utilities.cc:85–124

////////////////////////////////////////////////////////////////////////// Parse a URL to obtain a description for use with metrics when no user provided tag is available. This is used by the remap side of the plugin, while the SNI side uses the FQDN associated with each limiter instance which is obtained from the list of SNIs in the global plugin configuration.

// which is obtained from the list of SNIs in the global plugin configuration.
//
std::string
getDescriptionFromUrl(const char *url)
{
  TSMBuffer const buf     = TSMBufferCreate();
  TSMLoc          url_loc = nullptr;

  const int   url_len = strlen(url);
  std::string description;

  if (TS_SUCCESS == TSUrlCreate(buf, &url_loc) && TS_PARSE_DONE == TSUrlParse(buf, url_loc, &url, url + url_len)) {
    int         host_len, scheme_len = 0;
    const char *s    = TSUrlSchemeGet(buf, url_loc, &scheme_len);
    const char *h    = TSUrlHostGet(buf, url_loc, &host_len);
    const int   port = TSUrlPortGet(buf, url_loc);

    const std::string hostname = std::string(h, host_len);
    const std::string scheme   = std::string(s, scheme_len);

    Dbg(dbg_ctl, "scheme = %s, host = %s, port = %d", scheme.c_str(), hostname.c_str(), port);

    description = scheme;
    description.append(".");
    description.append(hostname);

    // only append the port when it is non-standard
    if (!(strncmp(s, TS_URL_SCHEME_HTTP, scheme_len) == 0 && port == 80) &&
        !(strncmp(s, TS_URL_SCHEME_HTTPS, scheme_len) == 0 && port == 443)) {
      description.push_back(':');
      description.append(std::to_string(port));
    }
  }

  if (url_loc != nullptr) {
    TSHandleMLocRelease(buf, nullptr, url_loc);
  }

  TSMBufferDestroy(buf);

  return description;
}