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#include "alert.h"
#include "config.h"
#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef enum {
TYPE_API,
TYPE_EMAIL
} alert_type_t;
typedef struct {
alert_type_t type;
char *target; /* in api: endpoint, in email: address */
char *extra; /* in api: Content-Type, in email: subject template */
char *body_tmpl;
} alert_t;
alert_t *alerts = NULL;
size_t alerts_size = 0, alerts_capacity = INIT_VEC_CAPACITY;
static const char *type_str[] = { "api", "email" };
static const char *status_str[] = { "down", "up" };
static const char *from = NULL;
static size_t
write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{
return size * nmemb;
}
static int
send_api(const target_t *target, const char *endpoint, const char *content_type,
const char *body_tmpl)
{
static char buff[4096];
CURL *curl = curl_easy_init();
if (!curl) {
fprintf(stderr, "Error allocating cURL handle\n");
return -1;
}
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 1);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
struct curl_slist *list = NULL;
snprintf(buff, 256, "Content-Type: %s", content_type);
list = curl_slist_append(list, buff); /* copies */
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
snprintf(buff, 4096, body_tmpl, target->name, status_str[target->status]);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, buff);
CURLcode curl_code = curl_easy_perform(curl);
if (curl_code != CURLE_OK) {
printf("curl_easy_perform() failed: %s\n",
curl_easy_strerror(curl_code));
return STATUS_DOWN;
}
long http_code;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
curl_easy_cleanup(curl);
printf("%ld\n", http_code);
return http_code == 200 ? STATUS_UP : STATUS_DOWN;
}
static int
send_email(const target_t *target, const char *address, const char *subject_tmpl,
const char *body_tmpl)
{
}
int
alert_init()
{
alerts = malloc(INIT_VEC_CAPACITY * sizeof(alert_t));
from = alert_config.from;
printf("alerts:\n");
char line[256];
char *src_line = alert_config.alert_config;
while (src_line != (void*)1) {
char *next_line = strchr(src_line, '\n');
size_t linelen = next_line ? next_line - src_line : strlen(src_line);
strncpy(line, src_line, linelen);
line[linelen] = '\0';
src_line = next_line + 1;
if (*line == '\n' || *line == '\0')
continue;
char *type = strtok(line, ",");
char *target = strtok(NULL, ",");
char *extra = strtok(NULL, ",");
char *body_tmpl = strtok(NULL, ",");
if (!type || !target) {
fprintf(stderr, "malformed config line: %s\n", line);
continue;
}
if (strcmp(type, "api") == 0)
alerts[alerts_size].type = TYPE_API;
else if (strcmp(type, "email") == 0)
alerts[alerts_size].type = TYPE_EMAIL;
else {
fprintf(stderr, "unknown alert type: %s\n", line);
continue;
}
alerts[alerts_size].target = strdup(target);
alerts[alerts_size].extra = strdup(extra);
alerts[alerts_size].body_tmpl = strdup(body_tmpl);
printf("\t%s: %s\n",
alerts[alerts_size].target,
type_str[alerts[alerts_size].type]
);
alerts_size++;
}
return alerts_size;
}
void
alert_trigger(const target_t *target)
{
static const int (*send_funcs[])(const target_t *, const char *,
const char *, const char *) =
{
send_api,
send_email
};
static char timestr[256];
time_t time_now = time(NULL);
struct tm *tm_now = gmtime(&time_now);
strftime(timestr, 256, "%F %T", tm_now);
for (int i = 0; i < alerts_size; i++) {
printf("[%s] [monitor] alerted %s about %s\n",
timestr, alerts[i].target, target->name);
send_funcs[target->type](target, alerts[i].target, alerts[i].extra,
alerts[i].body_tmpl);
}
}
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