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http_prometheus.c
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http_prometheus.c
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/* http_prometheus.c -- Routines for handling Prometheus requests in httpd
*
* Copyright (c) 1994-2017 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <config.h>
#include "imap/httpd.h"
#include "imap/http_err.h"
#include "imap/prometheus.h"
static int prom_need_auth(struct transaction_t *txn);
static void prom_init(struct buf *);
static int prom_auth(const char *);
static void prom_reset(void);
static void prom_shutdown(void);
static int prom_get(struct transaction_t *txn, void *params);
struct namespace_t namespace_prometheus = {
URL_NS_PROMETHEUS,
/*enabled*/ 0,
"prometheus",
"/metrics",
/* XXX .well-known url*/ NULL,
prom_need_auth,
/* XXX auth schemes*/ 0,
/*mboxtype*/ 0,
(ALLOW_READ),
&prom_init,
&prom_auth,
&prom_reset,
&prom_shutdown,
/* XXX premethod */ NULL,
/* XXX bearer */ NULL,
{
{ NULL, NULL }, /* ACL */
{ NULL, NULL }, /* BIND */
{ NULL, NULL }, /* CONNECT */
{ NULL, NULL }, /* COPY */
{ NULL, NULL }, /* DELETE */
{ &prom_get, NULL }, /* GET */
{ NULL, NULL }, /* HEAD */
{ NULL, NULL }, /* LOCK */
{ NULL, NULL }, /* MKCALENDAR */
{ NULL, NULL }, /* MKCOL */
{ NULL, NULL }, /* MOVE */
{ &meth_options, NULL }, /* OPTIONS */
{ NULL, NULL }, /* PATCH */
{ NULL, NULL }, /* POST */
{ NULL, NULL }, /* PROPFIND */
{ NULL, NULL }, /* PROPPATCH */
{ NULL, NULL }, /* PUT */
{ NULL, NULL }, /* REPORT */
{ &meth_trace, NULL }, /* TRACE */
{ NULL, NULL }, /* UNBIND */
{ NULL, NULL }, /* UNLOCK */
},
};
static int prom_need_auth(struct transaction_t *txn __attribute__((unused)))
{
const char *need_auth = config_getstring(IMAPOPT_PROMETHEUS_NEED_AUTH);
if (!strcmp(need_auth, "none"))
return 0;
return HTTP_UNAUTHORIZED;
}
static void prom_init(struct buf *serverinfo __attribute__((unused)))
{
namespace_prometheus.enabled =
(config_httpmodules & IMAP_ENUM_HTTPMODULES_PROMETHEUS)
&& config_getswitch(IMAPOPT_PROMETHEUS_ENABLED);
}
static int prom_auth(const char *userid __attribute__((unused)))
{
/* FIXME */
return 0;
}
static void prom_reset(void)
{
/* FIXME */
}
static void prom_shutdown(void)
{
/* FIXME */
}
static int prom_get(struct transaction_t *txn,
void *params __attribute__((unused)))
{
struct buf buf = BUF_INITIALIZER;
const char *mimetype = NULL;
int r;
if (strcmp(txn->req_uri->path, "/metrics"))
return HTTP_NOT_FOUND;
const char *need_auth = config_getstring(IMAPOPT_PROMETHEUS_NEED_AUTH);
if (!strcmp(need_auth, "admin") && !httpd_userisadmin)
return HTTP_UNAUTHORIZED;
if (!strcmp(need_auth, "user") && !httpd_userid)
return HTTP_UNAUTHORIZED;
r = prometheus_text_report(&buf, &mimetype);
if (r) {
txn->error.desc = error_message(r);
return HTTP_SERVER_ERROR;
}
txn->resp_body.type = mimetype;
txn->resp_body.len = buf_len(&buf);
write_body(HTTP_OK, txn, buf_cstring(&buf), buf_len(&buf));
buf_free(&buf);
return 0;
}

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