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relay: Groundwork for relay metrics support
The basic functions for the relay subsystem to expose metrics onto the MetricsPort. Part of #40367 Signed-off-by: David Goulet <dgoulet@torproject.org>
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@ -15,6 +15,7 @@ MODULE_RELAY_SOURCES = \
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src/feature/relay/routermode.c \
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src/feature/relay/routermode.c \
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src/feature/relay/relay_config.c \
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src/feature/relay/relay_config.c \
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src/feature/relay/relay_handshake.c \
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src/feature/relay/relay_handshake.c \
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src/feature/relay/relay_metrics.c \
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src/feature/relay/relay_periodic.c \
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src/feature/relay/relay_periodic.c \
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src/feature/relay/relay_sys.c \
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src/feature/relay/relay_sys.c \
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src/feature/relay/routerkeys.c \
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src/feature/relay/routerkeys.c \
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@ -30,6 +31,7 @@ noinst_HEADERS += \
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src/feature/relay/onion_queue.h \
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src/feature/relay/onion_queue.h \
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src/feature/relay/relay_config.h \
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src/feature/relay/relay_config.h \
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src/feature/relay/relay_handshake.h \
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src/feature/relay/relay_handshake.h \
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src/feature/relay/relay_metrics.h \
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src/feature/relay/relay_periodic.h \
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src/feature/relay/relay_periodic.h \
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src/feature/relay/relay_sys.h \
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src/feature/relay/relay_sys.h \
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src/feature/relay/relay_find_addr.h \
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src/feature/relay/relay_find_addr.h \
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59
src/feature/relay/relay_metrics.c
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59
src/feature/relay/relay_metrics.c
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@ -0,0 +1,59 @@
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/* Copyright (c) 2021, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* @file relay_metrics.c
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* @brief Relay metrics exposed through the MetricsPort
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**/
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#define RELAY_METRICS_ENTRY_PRIVATE
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#include "orconfig.h"
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#include "lib/malloc/malloc.h"
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#include "lib/container/smartlist.h"
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#include "lib/metrics/metrics_store.h"
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#include "lib/log/util_bug.h"
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#include "feature/relay/relay_metrics.h"
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/** The only and single store of all the relay metrics. */
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static metrics_store_t *the_store;
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/** Return a list of all the relay metrics stores. This is the
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* function attached to the .get_metrics() member of the subsys_t. */
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const smartlist_t *
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relay_metrics_get_stores(void)
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{
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/* We can't have the caller to free the returned list so keep it static,
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* simply update it. */
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static smartlist_t *stores_list = NULL;
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if (!stores_list) {
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stores_list = smartlist_new();
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smartlist_add(stores_list, the_store);
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}
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return stores_list;
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}
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/** Initialize the relay metrics. */
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void
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relay_metrics_init(void)
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{
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if (BUG(the_store)) {
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return;
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}
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the_store = metrics_store_new();
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}
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/** Free the relay metrics. */
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void
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relay_metrics_free(void)
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{
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if (!the_store) {
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return;
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}
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/* NULL is set with this call. */
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metrics_store_free(the_store);
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}
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21
src/feature/relay/relay_metrics.h
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src/feature/relay/relay_metrics.h
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/* Copyright (c) 2021, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* @file relay_metrics.h
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* @brief Header for feature/relay/relay_metrics.c
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**/
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#ifndef TOR_FEATURE_RELAY_RELAY_METRICS_H
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#define TOR_FEATURE_RELAY_RELAY_METRICS_H
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#include "lib/container/smartlist.h"
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/* Init. */
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void relay_metrics_init(void);
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void relay_metrics_free(void);
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/* Accessors. */
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const smartlist_t *relay_metrics_get_stores(void);
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#endif /* !defined(TOR_FEATURE_RELAY_RELAY_METRICS_H) */
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@ -14,6 +14,7 @@
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#include "feature/relay/dns.h"
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#include "feature/relay/dns.h"
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#include "feature/relay/ext_orport.h"
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#include "feature/relay/ext_orport.h"
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#include "feature/relay/relay_metrics.h"
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#include "feature/relay/onion_queue.h"
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#include "feature/relay/onion_queue.h"
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#include "feature/relay/relay_periodic.h"
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#include "feature/relay/relay_periodic.h"
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#include "feature/relay/relay_sys.h"
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#include "feature/relay/relay_sys.h"
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@ -25,6 +26,7 @@
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static int
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static int
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subsys_relay_initialize(void)
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subsys_relay_initialize(void)
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{
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{
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relay_metrics_init();
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relay_register_periodic_events();
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relay_register_periodic_events();
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return 0;
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return 0;
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}
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}
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@ -37,6 +39,7 @@ subsys_relay_shutdown(void)
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clear_pending_onions();
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clear_pending_onions();
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routerkeys_free_all();
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routerkeys_free_all();
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router_free_all();
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router_free_all();
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relay_metrics_free();
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}
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}
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const struct subsys_fns_t sys_relay = {
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const struct subsys_fns_t sys_relay = {
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@ -46,4 +49,6 @@ const struct subsys_fns_t sys_relay = {
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.level = RELAY_SUBSYS_LEVEL,
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.level = RELAY_SUBSYS_LEVEL,
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.initialize = subsys_relay_initialize,
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.initialize = subsys_relay_initialize,
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.shutdown = subsys_relay_shutdown,
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.shutdown = subsys_relay_shutdown,
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.get_metrics = relay_metrics_get_stores,
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};
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};
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