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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* CMetrics
* ========
* Copyright 2021-2022 The CMetrics Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cmetrics/cmetrics.h>
#include <cmetrics/cmt_histogram.h>
#include <cmetrics/cmt_encode_prometheus.h>
#include <cmetrics/cmt_map.h>
#include "cmt_tests.h"
#include <math.h>
#include <float.h>
#include <stdbool.h>
/* values to observe in a histogram */
double hist_observe_values[10] = {
0.0 , 1.02, 2.04, 3.06,
4.08, 5.10, 6.12, 7.14,
8.16, 9.18
};
/*
* histogram bucket values: the values computed in the buckets,
* all of them are uint64_t.
*
* Note that on all examples we use the default buckets values, created manually
* and through the API:
*
* - 11 bucket values
* - 1 +Inf bucket value
*/
uint64_t hist_buckets_values[12] = {1, 1, 1, 1, 1, 1, 1, 1,
3, 5, 10, 10};
/* histogram _count value */
uint64_t hist_count = 10;
/* histogram _sum value */
double hist_sum = 45.9;
bool fequal(double a, double b)
{
return (fabs(a - b) < (DBL_EPSILON * fabs(a + b)));
}
static void histogram_check(struct cmt_histogram *h,
int labels_count, char **labels_vals)
{
int i;
int ret;
uint64_t val;
struct cmt_metric *metric;
/* retrieve the metric context */
metric = cmt_map_metric_get(&h->opts, h->map,
labels_count, labels_vals, CMT_TRUE);
TEST_CHECK(metric != NULL);
/* check bucket values */
for (i = 0; i < (sizeof(hist_buckets_values)/sizeof(uint64_t)); i++) {
val = cmt_metric_hist_get_value(metric, i);
TEST_CHECK(val == hist_buckets_values[i]);
}
/* check _count */
TEST_CHECK(hist_count == cmt_metric_hist_get_count_value(metric));
/* check _sum */
ret = fequal(hist_sum, cmt_metric_hist_get_sum_value(metric));
TEST_CHECK(ret != 0);
}
static int histogram_observe_all(struct cmt_histogram *h,
uint64_t timestamp,
int labels_count, char **labels_vals)
{
int i;
double val;
for (i = 0; i < sizeof(hist_observe_values)/(sizeof(double)); i++) {
val = hist_observe_values[i];
cmt_histogram_observe(h, timestamp, val, labels_count, labels_vals);
}
return i;
}
static void prometheus_encode_test(struct cmt *cmt)
{
cfl_sds_t buf;
buf = cmt_encode_prometheus_create(cmt, CMT_FALSE);
printf("\n%s\n", buf);
cmt_encode_prometheus_destroy(buf);
}
void test_histogram()
{
uint64_t ts;
struct cmt *cmt;
struct cmt_histogram *h;
struct cmt_histogram_buckets *buckets;
cmt_initialize();
/* Timestamp */
ts = cfl_time_now();
/* CMetrics context */
cmt = cmt_create();
TEST_CHECK(cmt != NULL);
/* Create buckets */
buckets = cmt_histogram_buckets_create(11,
0.005, 0.01, 0.025, 0.05,
0.1, 0.25, 0.5, 1.0, 2.5,
5.0, 10.0);
TEST_CHECK(buckets != NULL);
/* Create a gauge metric type */
h = cmt_histogram_create(cmt,
"k8s", "network", "load", "Network load",
buckets,
1, (char *[]) {"my_label"});
TEST_CHECK(h != NULL);
/* no labels */
histogram_observe_all(h, ts, 0, NULL);
histogram_check(h, 0, NULL);
prometheus_encode_test(cmt);
/* static label: register static label for the context */
cmt_label_add(cmt, "static", "test");
histogram_check(h, 0, NULL);
prometheus_encode_test(cmt);
/* defined labels: add a custom label value */
histogram_observe_all(h, ts, 1, (char *[]) {"val"});
histogram_check(h, 1, (char *[]) {"val"});
prometheus_encode_test(cmt);
cmt_destroy(cmt);
}
void test_set_defaults()
{
uint64_t ts;
struct cmt *cmt;
struct cmt_histogram *h;
struct cmt_histogram_buckets *buckets;
cmt_initialize();
/* Timestamp */
ts = cfl_time_now();
/* CMetrics context */
cmt = cmt_create();
TEST_CHECK(cmt != NULL);
/* Create buckets */
buckets = cmt_histogram_buckets_default_create();
TEST_CHECK(buckets != NULL);
/* Create a gauge metric type */
h = cmt_histogram_create(cmt,
"k8s", "network", "load", "Network load",
buckets,
1, (char *[]) {"my_label"});
TEST_CHECK(h != NULL);
/* set default buckets values / no labels */
cmt_histogram_set_default(h, ts,
hist_buckets_values,
hist_sum, hist_count, 0, NULL);
histogram_check(h, 0, NULL);
prometheus_encode_test(cmt);
/* static label: register static label for the context */
cmt_label_add(cmt, "static", "test");
histogram_check(h, 0, NULL);
prometheus_encode_test(cmt);
/* perform observation with labels */
histogram_observe_all(h, ts, 1, (char *[]) {"val"});
histogram_check(h, 1, (char *[]) {"val"});
prometheus_encode_test(cmt);
cmt_destroy(cmt);
}
TEST_LIST = {
{"histogram" , test_histogram},
{"set_defaults", test_set_defaults},
{ 0 }
};
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