Commit a882d1bf authored by David Goulet's avatar David Goulet 🐼
Browse files

metrics: New feature module to track tor metrics 



Related to #40063

Signed-off-by: David Goulet's avatarDavid Goulet <dgoulet@torproject.org>
parent ec731290

src/app/main/subsystem_list.c

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@@ -31,6 +31,7 @@ 
#include "lib/evloop/evloop_sys.h"



#include "feature/dirauth/dirauth_sys.h"

#include "feature/metrics/metrics_sys.h"

#include "feature/relay/relay_sys.h"



#include <stddef.h>
@@ -68,6 +69,7 @@ const subsys_fns_t *tor_subsystems[] = { 
  &sys_btrack,



  &sys_dirauth,

  &sys_metrics,

};



const unsigned n_tor_subsystems = ARRAY_LENGTH(tor_subsystems);

src/feature/metrics/.may_include

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*.h

src/feature/metrics/include.am

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# ADD_C_FILE: INSERT SOURCES HERE.

LIBTOR_APP_A_SOURCES +=		\

	src/feature/metrics/metrics.c		\

	src/feature/metrics/metrics_sys.c



# ADD_C_FILE: INSERT HEADERS HERE.

noinst_HEADERS +=		\

	src/feature/metrics/metrics.h		\

	src/feature/metrics/metrics_sys.h

src/feature/metrics/metrics.c

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/* Copyright (c) 2007-2020, The Tor Project, Inc. */

/* See LICENSE for licensing information */



/**

 * @file metrics.c

 * @brief Metrics subsystem.

 **/



#include "orconfig.h"



#include "lib/container/smartlist.h"

#include "lib/log/util_bug.h"

#include "lib/malloc/malloc.h"

#include "lib/metrics/metrics_store.h"

#include "lib/string/printf.h"



#include "feature/metrics/metrics.h"



#include "app/main/subsysmgr.h"



/** Return newly allocated string containing the output of all subsystems

 * having metrics.

 *

 * This is used to output the content on the MetricsPort. */

char *

metrics_get_output(const metrics_format_t fmt)

{

  char *data;

  smartlist_t *chunks = smartlist_new();



  /* Go over all subsystems that exposes a metrics store. */

  for (unsigned i = 0; i < n_tor_subsystems; ++i) {

    const smartlist_t *stores;

    const subsys_fns_t *sys = tor_subsystems[i];



    /* Skip unsupported subsystems. */

    if (!sys->supported) {

      continue;

    }



    if (sys->get_metrics && (stores = sys->get_metrics())) {

      SMARTLIST_FOREACH_BEGIN(stores, const metrics_store_t *, store) {

        smartlist_add(chunks, metrics_store_get_output(fmt, store));

      } SMARTLIST_FOREACH_END(store);

    }

  }



  data = smartlist_join_strings(chunks, "\n", 0, NULL);



  SMARTLIST_FOREACH(chunks, char *, c, tor_free(c));

  smartlist_free(chunks);



  return data;

}



/** Initialize the subsystem. */

void

metrics_init(void)

{

}



/** Cleanup and free any global memory of this subsystem. */

void

metrics_cleanup(void)

{

}

src/feature/metrics/metrics.h

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/* Copyright (c) 2020, The Tor Project, Inc. */

/* See LICENSE for licensing information */



/**

 * @file metrics.h

 * @brief Header for feature/metrics/metrics.c

 **/



#ifndef TOR_FEATURE_METRICS_METRICS_H

#define TOR_FEATURE_METRICS_METRICS_H



#include "lib/metrics/metrics_common.h"



/* Initializer / Cleanup. */

void metrics_init(void);

void metrics_cleanup(void);



/* Accessors. */

char *metrics_get_output(const metrics_format_t fmt);



#endif /* !defined(TOR_FEATURE_METRICS_METRICS_H) */