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#include "metrics.h"
#include "log.h"
#include "microhttpd.h"
prom_counter_t *bytesRecv = NULL;
prom_counter_t *bytesSent = NULL;
prom_counter_t *meta = NULL;
prom_counter_t *peers = NULL;
prom_counter_t *hashes = NULL;
prom_counter_t *hash_expired = NULL;
prom_counter_t *queries = NULL;
prom_counter_t *requests = NULL;
prom_histogram_t *offered = NULL;
prom_gauge_t *activeNodes = NULL;
prom_gauge_t *requestsInFlight = NULL;
prom_counter_t *retries = NULL;
enum MHD_Result promhttp_handler(
void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **con_cls
) {
if (strcmp(method, "GET") != 0) {
char *buf = "Invalid HTTP Method\n";
struct MHD_Response *response = MHD_create_response_from_buffer(strlen(buf), (void *)buf, MHD_RESPMEM_PERSISTENT);
int ret = MHD_queue_response(connection, MHD_HTTP_BAD_REQUEST, response);
MHD_destroy_response(response);
return ret;
}
if (strcmp(url, "/") == 0) {
char *buf = "OK\n";
struct MHD_Response *response = MHD_create_response_from_buffer(strlen(buf), (void *)buf, MHD_RESPMEM_PERSISTENT);
int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return ret;
}
if (strcmp(url, "/metrics") == 0) {
const char *buf = prom_collector_registry_bridge(PROM_COLLECTOR_REGISTRY_DEFAULT);
struct MHD_Response *response = MHD_create_response_from_buffer(strlen(buf), (void *)buf, MHD_RESPMEM_MUST_FREE);
int ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return ret;
}
char *buf = "Bad Request\n";
struct MHD_Response *response = MHD_create_response_from_buffer(strlen(buf), (void *)buf, MHD_RESPMEM_PERSISTENT);
int ret = MHD_queue_response(connection, MHD_HTTP_BAD_REQUEST, response);
MHD_destroy_response(response);
return ret;
}
#define PORT 6981
struct MHD_Daemon *mDaemon;
// @CLEAN: We should call this begin
void metric_init() {
if(prom_collector_registry_default_init() != 0) {
fatal("Failed to initialize prometheus registry");
}
mDaemon = MHD_start_daemon(MHD_USE_SELECT_INTERNALLY, PORT, NULL, NULL, &promhttp_handler, NULL, MHD_OPTION_END);
if(mDaemon == NULL) {
fatal("Failed to start http server");
}
dbg("Metrics server started on port %d", PORT);
bytesRecv = prom_collector_registry_must_register_metric(
prom_counter_new(
"bytes_received",
"Number of bytes received",
0,
NULL
)
);
bytesSent = prom_collector_registry_must_register_metric(
prom_counter_new(
"bytes_sent",
"Number of bytes sent",
0,
NULL
)
);
meta = prom_collector_registry_must_register_metric(
prom_counter_new(
"meta",
"Meta information value is always 1",
1,
(const char *[]){ "nodeid" }
)
);
peers = prom_collector_registry_must_register_metric(
prom_counter_new(
"peers",
"Number of total peers",
0,
NULL
)
);
hashes = prom_collector_registry_must_register_metric(
prom_counter_new(
"hashes",
"Number of hashes currently stored",
0,
NULL
)
);
hash_expired = prom_collector_registry_must_register_metric(
prom_counter_new(
"hashes_expired",
"Number of hashes expired due to inactivity",
0,
NULL
)
);
queries = prom_collector_registry_must_register_metric(
prom_counter_new(
"queries",
"Amount of queries handled",
1,
(const char *[]){"outcome"}
)
);
requests = prom_collector_registry_must_register_metric(
prom_counter_new(
"requests",
"Number of requests sent by us",
0,
NULL
)
);
requestsInFlight = prom_collector_registry_must_register_metric(
prom_gauge_new(
"requests_in_flight",
"Requests currently in flight",
0,
NULL
)
);
retries = prom_collector_registry_must_register_metric(
prom_counter_new(
"retries",
"Retries sent for unanswered requests",
0,
NULL
)
);
offered = prom_collector_registry_must_register_metric(
prom_histogram_new(
"offered",
"Nodes seen and considered for the routing table",
prom_histogram_buckets_linear(0, 1, 157),
0,
NULL
)
);
activeNodes = prom_collector_registry_must_register_metric(
prom_gauge_new(
"active_nodes",
"Nodes active in the routing table",
0,
NULL
)
);
}
void metric_end() {
MHD_stop_daemon(mDaemon);
if(prom_collector_registry_destroy(PROM_COLLECTOR_REGISTRY_DEFAULT) != 0) {
fatal("Failed to destroy the registry");
}
dbg("Metric server stopped");
}
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