tor

The Tor anonymity network
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metrics_common.c (983B)

      1 /* 2020, The Tor Project, Inc. */
      2 /* See LICENSE for licensing information */
      3 
      4 /**
      5 * @file metrics_common.c
      6 * @brief Common code for the metrics library
      7 **/
      8 
      9 #include <stddef.h>
     10 
     11 #include "orconfig.h"
     12 
     13 #include "lib/log/util_bug.h"
     14 #include "lib/string/printf.h"
     15 
     16 #include "lib/metrics/metrics_common.h"
     17 
     18 /** Return string representation of a metric type. */
     19 const char *
     20 metrics_type_to_str(const metrics_type_t type)
     21 {
     22  switch (type) {
     23  case METRICS_TYPE_COUNTER:
     24    return "counter";
     25  case METRICS_TYPE_GAUGE:
     26    return "gauge";
     27  case METRICS_TYPE_HISTOGRAM:
     28    return "histogram";
     29  default:
     30    tor_assert_unreached();
     31  }
     32 }
     33 
     34 /** Return a static buffer pointer that contains a formatted label on the form
     35 * of key=value.
     36 *
     37 * Subsequent call to this function invalidates the previous buffer. */
     38 const char *
     39 metrics_format_label(const char *key, const char *value)
     40 {
     41  static char buf[128];
     42  tor_snprintf(buf, sizeof(buf), "%s=\"%s\"", key, value);
     43  return buf;
     44 }