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/**
* Copyright 2019-2020 DigitalOcean Inc.
*
* 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 <string.h>
#include "microhttpd.h"
#include "prom.h"
prom_collector_registry_t *PROM_ACTIVE_REGISTRY;
void promhttp_set_active_collector_registry(prom_collector_registry_t *active_registry) {
if (!active_registry) {
PROM_ACTIVE_REGISTRY = PROM_COLLECTOR_REGISTRY_DEFAULT;
} else {
PROM_ACTIVE_REGISTRY = active_registry;
}
}
int 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_ACTIVE_REGISTRY);
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;
}
struct MHD_Daemon *promhttp_start_daemon(unsigned int flags, unsigned short port, MHD_AcceptPolicyCallback apc,
void *apc_cls) {
return MHD_start_daemon(flags, port, apc, apc_cls, &promhttp_handler, NULL, MHD_OPTION_END);
}
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