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#include <gtest/gtest.h>
#include <stub/stub.h>
#include <fstream>
#include <thread>
#include "utils.hpp"
#include "cjson/cJSON.h"
#include "fieldstat_easy.h"
#define FILENAME "./test_easy_fieldstat.json"
TEST(test_easy_fieldstat, new_and_free)
{
struct fieldstat_easy *fse = fieldstat_easy_new(10, "instance name1231231231", &TEST_TAG_STRING, 1);
fieldstat_easy_free(fse);
}
TEST(test_easy_fieldstat, output_to_buff)
{
struct fieldstat_easy *fse = fieldstat_easy_new(10, NULL, &TEST_TAG_STRING, 1);
fieldstat_easy_register_counter(fse, "metric counter");
fieldstat_easy_counter_incrby(fse, 0, 0, &TEST_TAG_INT, 1, 1);
// read file, should be empty
char *buff = NULL;
size_t buff_len = 0;
fieldstat_easy_output(fse, &buff, &buff_len);
cJSON *root = cJSON_Parse(buff);
cJSON *cell = cJSON_GetArrayItem(root, 0);
cJSON *metric = cJSON_GetObjectItem(cell, "fields");
long long value = cJSON_GetObjectItem(metric, "metric counter")->valueint;
EXPECT_EQ(value, 1);
cJSON *tags = cJSON_GetObjectItem(cell, "tags");
EXPECT_EQ(cJSON_GetObjectItem(tags, TEST_TAG_INT.key)->valueint, TEST_TAG_INT.value_longlong);
EXPECT_STREQ(cJSON_GetObjectItem(tags, TEST_TAG_STRING.key)->valuestring, TEST_TAG_STRING.value_str);
cJSON_Delete(root);
free(buff);
fieldstat_easy_free(fse);
}
cJSON *read_file()
{
std::ifstream ifs(FILENAME);
if (!ifs.is_open()) {
return NULL;
}
std::string content((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
printf("content: %s\n", content.c_str());
cJSON *root = cJSON_Parse(content.c_str());
ifs.close();
return root;
}
TEST(test_easy_fieldstat, output_to_file)
{
struct fieldstat_easy *fse = fieldstat_easy_new(10, NULL, NULL, 0);
int counter_id = fieldstat_easy_register_counter(fse, "metric counter");
fieldstat_easy_enable_auto_output(fse, FILENAME, 1);
sleep(3); // long enough to output
// 1st interval: read file, should be empty
printf("1st interval\n");
cJSON *root = read_file();
EXPECT_EQ(cJSON_GetArraySize(root), 0); // is empty and valid
cJSON_Delete(root);
fieldstat_easy_counter_incrby(fse, 0, counter_id, &TEST_TAG_INT, 1, 1);
fieldstat_easy_counter_incrby(fse, 1, counter_id, &TEST_TAG_INT, 1, 10);
fieldstat_easy_counter_incrby(fse, 2, counter_id, &TEST_TAG_INT, 1, 100);
sleep(2);
// 2nd interval: merge 3 thread's data, and output
printf("2nd interval\n");
root = read_file();
EXPECT_EQ(cJSON_GetArraySize(root), 1);
cJSON *tagged_by_int = cJSON_GetArrayItem(root, 0);
cJSON *metric = cJSON_GetObjectItem(tagged_by_int, "fields");
EXPECT_TRUE(metric != NULL);
long long value = cJSON_GetObjectItem(metric, "metric counter")->valueint;
EXPECT_EQ(value, 111);
cJSON_Delete(root);
// 3nd interval: no new data, just output again
sleep(1);
printf("3rd interval\n");
root = read_file();
EXPECT_EQ(cJSON_GetArraySize(root), 1);
tagged_by_int = cJSON_GetArrayItem(root, 0);
metric = cJSON_GetObjectItem(tagged_by_int, "fields");
value = cJSON_GetObjectItem(metric, "metric counter")->valueint;
EXPECT_EQ(value, 111); // should not change
cJSON_Delete(root);
// 4th interval: new data, output again
fieldstat_easy_counter_incrby(fse, 0, counter_id, &TEST_TAG_DOUBLE, 1, 10086);
sleep(2);
printf("4th interval\n");
root = read_file();
cJSON *tagged_by_double = cJSON_GetArrayItem(root, 1);
metric = cJSON_GetObjectItem(tagged_by_double, "fields");
value = cJSON_GetObjectItem(metric, "metric counter")->valueint;
EXPECT_EQ(value, 10086);
cJSON_Delete(root);
fieldstat_easy_free(fse);
remove(FILENAME);
}
TEST(test_easy_fieldstat, empty_tag)
{
struct fieldstat_easy *fse = fieldstat_easy_new(10, "ha", NULL, 0);
int counter_id = fieldstat_easy_register_counter(fse, "metric counter");
fieldstat_easy_counter_incrby(fse, 0, counter_id, NULL, 0, 1);
fieldstat_easy_enable_auto_output(fse, FILENAME, 2);
sleep(3); // long enough to output, but only once
fieldstat_easy_free(fse);
cJSON *root = read_file();
EXPECT_EQ(cJSON_GetArraySize(root), 1);
cJSON *tagged_by_int = cJSON_GetArrayItem(root, 0);
cJSON *metric = cJSON_GetObjectItem(tagged_by_int, "fields");
EXPECT_TRUE(metric != NULL);
cJSON *metric_delta = cJSON_GetObjectItem(tagged_by_int, "fields_delta");
EXPECT_TRUE(metric_delta != NULL);
long long value = cJSON_GetObjectItem(metric, "metric counter")->valueint;
EXPECT_EQ(value, 1);
long long value_delta = cJSON_GetObjectItem(metric_delta, "metric counter")->valueint;
EXPECT_EQ(value_delta, 1);
cJSON_Delete(root);
remove(FILENAME);
}
extern "C" {
extern char *fs_easy_output_to_json(struct fieldstat_easy *fs, struct timeval *timestamp);
}
int g_output_count = 0;
char *fs_easy_output_to_json_stub(struct fieldstat_easy *fs, struct timeval *timestamp)
{
g_output_count++;
return NULL;
}
TEST(test_easy_fieldstat, output_interval_ok)
{
Stub stub;
stub.set(fs_easy_output_to_json, fs_easy_output_to_json_stub);
struct fieldstat_easy *fse = fieldstat_easy_new(10, NULL, NULL, 0);
fieldstat_easy_register_histogram(fse, "metric histogram", 1, 100000, 3); // a pretty time consuming metric
fieldstat_easy_histogram_record(fse, 0, 0, &TEST_TAG_INT, 1, 1);
fieldstat_easy_histogram_record(fse, 0, 0, &TEST_TAG_DOUBLE, 1, 10);
fieldstat_easy_histogram_record(fse, 0, 0, &TEST_TAG_STRING, 1, 110);
fieldstat_easy_enable_auto_output(fse, FILENAME, 1);
sleep(30); // output 30s/1s = 20 times
fieldstat_easy_free(fse);
EXPECT_TRUE(g_output_count == 30 || g_output_count == 29); // missing only one is ok and expected
}
TEST(test_easy_fieldstat, ensure_data_racing_of_two_output_and_of_incyby)
{
const int N_THREADS = 3;
struct fieldstat_tag global_tags[1];
struct fieldstat_tag tmptag;
tmptag.key = "app id";
tmptag.type = TAG_INTEGER;
tmptag.value_longlong = 1;
global_tags[0] = tmptag;
struct fieldstat_easy *fse = fieldstat_easy_new(N_THREADS, NULL, global_tags, 1);
int counter_id = fieldstat_easy_register_counter(fse, "incoming bytes");
int hdr_id = fieldstat_easy_register_histogram(fse, "delay", 1, 10000, 1);
fieldstat_easy_enable_auto_output(fse, FILENAME, 1);
std::thread threads[N_THREADS];
for (int thread_id = 0; thread_id < N_THREADS; thread_id++) {
threads[thread_id] = std::thread([fse, counter_id, hdr_id, thread_id]() {
for (int i = 0; i < 1000000; i++) { // loop million times to ensure no core dump
fieldstat_easy_counter_incrby(fse, thread_id, counter_id, &TEST_TAG_INT, 1, 1);
fieldstat_easy_histogram_record(fse, thread_id, hdr_id, &TEST_TAG_INT, 1, rand() % 10000);
usleep(1); // 1us * 1000000 = 1s, just long enough to output
}
});
}
for (int i = 0; i < N_THREADS; i++) {
threads[i].join();
}
fieldstat_easy_free(fse);
remove(FILENAME);
}
TEST(test_easy_fieldstat, reset)
{
struct fieldstat_easy *fse = fieldstat_easy_new(3, NULL, NULL, 0);
int counter_id = fieldstat_easy_register_counter(fse, "metric counter");
fieldstat_easy_counter_incrby(fse, 0, counter_id, &TEST_TAG_INT, 1, 1);
fieldstat_easy_counter_incrby(fse, 1, counter_id, &TEST_TAG_INT, 1, 1);
fieldstat_easy_reset(fse);
char *buff = NULL;
size_t buff_len = 0;
fieldstat_easy_output(fse, &buff, &buff_len);
EXPECT_STREQ(buff, "[]");
free(buff);
fieldstat_easy_free(fse);
}
int main(int argc, char **argv)
{
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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