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res_prometheus: Do not generate broken metrics

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In 8d6fdf9c3a invisible bridges were
skipped but that lead to producing metrics with no name and no help.

Keep track of the number of metrics configured and then only emit these.
Add a basic testcase that verifies that there is no '(NULL)' in the
output.

ASTERISK-30474
This commit is contained in:
Holger Hans Peter Freyther
2023-04-07 17:44:44 +08:00
committed by asterisk-org-access-app[bot]
parent c52b4ce11c
commit f335da6b74
2 changed files with 56 additions and 3 deletions
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6
res/prometheus/bridges.c
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@@ -83,7 +83,7 @@ static void bridges_scrape_cb(struct ast_str **response)
struct ast_bridge *bridge;
struct prometheus_metric *bridge_metrics;
char eid_str[32];
int i, j, num_bridges;
int i, j, num_bridges, num_outputs = 0;
struct prometheus_metric bridge_count = PROMETHEUS_METRIC_STATIC_INITIALIZATION(
PROMETHEUS_METRIC_GAUGE,
"asterisk_bridges_count",
@@ -138,7 +138,7 @@ static void bridges_scrape_cb(struct ast_str **response)
}
for (j = 0; j < ARRAY_LEN(bridge_metric_defs); j++) {
int index = i * ARRAY_LEN(bridge_metric_defs) + j;
int index = num_outputs++;
bridge_metrics[index].type = PROMETHEUS_METRIC_GAUGE;
ast_copy_string(bridge_metrics[index].name, bridge_metric_defs[j].name, sizeof(bridge_metrics[index].name));
@@ -159,7 +159,7 @@ static void bridges_scrape_cb(struct ast_str **response)
}
ao2_iterator_destroy(&it_bridges);
for (j = 0; j < ARRAY_LEN(bridge_metric_defs); j++) {
for (j = 0; j < num_outputs; j++) {
prometheus_metric_to_string(&bridge_metrics[j], response);
}