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mysql-test.c
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mysql-test.c
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#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <my_global.h> /* MySQL client headers */
#include <mysql.h>
#include "config.h"
int main(void) {
int list_s; /* listening socket */
int conn_s; /* connection socket */
struct sockaddr_in6 servaddr; /* socket address structure */
const int reuseaddr = 1; /* socket options */
const int port = PORT; /* port number */
int status = DEFAULT_HTTP_CODE; /* HTTP status code */
const int PROTOCOL_TCP = MYSQL_PROTOCOL_TCP; /* use TCP/IP */
if ((list_s = socket(AF_INET6, SOCK_STREAM, 0)) < 0) {
fprintf(stderr, "Error creating listening socket: %d\n", errno);
exit(EXIT_FAILURE);
}
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin6_family = AF_INET6;
servaddr.sin6_port = htons(port);
inet_pton(servaddr.sin6_family, MYSQL_HOST, &(servaddr.sin6_addr));
if (setsockopt(list_s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int)) < 0) {
fprintf(stderr, "Error calling setsockopt(): %d\n", errno);
exit(EXIT_FAILURE);
}
if (bind(list_s, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0) {
fprintf(stderr, "Error calling bind(): %d\n", errno);
exit(EXIT_FAILURE);
}
if (listen(list_s, LISTENQ) < 0) {
fprintf(stderr, "Error calling listen(): %d\n", errno);
exit(EXIT_FAILURE);
}
for (;;) {
if ((conn_s = accept(list_s, NULL, NULL)) < 0) {
continue;
}
MYSQL *conn_m = mysql_init(NULL);
/*
* While doing error handling on MySQL connection we
* deliberately set different new HTTP status code.
*
* HA-Proxy will be getting:
* 200 (good) - MySQL in good shape
* 500 (error) - MySQL in bad shape
* 503 (error) - connection failure to database
* 502 (error) - something wrong with this program
*/
if (conn_m == NULL) {
status = 503;
fprintf(stderr, "503 in mysql_init\n");
}
mysql_options(conn_m, MYSQL_OPT_PROTOCOL, &PROTOCOL_TCP);
if (mysql_real_connect(conn_m, MYSQL_HOST, MYSQL_USER, MYSQL_PASSWORD,
NULL, 0, NULL, 0) == NULL) {
status = 503;
fprintf(stderr, "503 in mysql_real_connect: %s\n",
mysql_error(conn_m));
}
if (mysql_query(conn_m, QUERY)) {
status = 503;
fprintf(stderr, "503 in mysql_query\n");
}
MYSQL_RES *result = mysql_store_result(conn_m);
if (result == NULL) {
status = 503;
fprintf(stderr, "503 in mysql_store_result\n");
}
if (status == DEFAULT_HTTP_CODE) {
/*
* Connected to database.
*/
MYSQL_ROW row;
while ((row = mysql_fetch_row(result))) {
char *slave_io_running = row[10];
char *slave_sql_running = row[11];
char *seconds_behind_master = row[32];
/*
* Testing for running slave threads:
*/
if (strcmp(GOOD_IO_RUNNING, slave_io_running) != 0) {
status = 500;
fprintf(stderr, "500: in GOOD_IO_RUNNING\n");
} else if (strcmp(GOOD_SQL_RUNNING, slave_sql_running) != 0) {
status = 500;
fprintf(stderr, "500: in GOOD_SQL_RUNNING\n");
} else {
/*
* Testing for lag behind master:
*/
char *end;
errno = 0;
const long ld = strtol(seconds_behind_master, &end, 10);
int seconds;
if ('\0' == seconds_behind_master[0]) {
status = 500;
fprintf(stderr, "500: array empty\n");
} else if (end == seconds_behind_master) {
status = 500;
fprintf(stderr, "500: %s: not a number\n",
seconds_behind_master);
} else if ('\0' != *end) {
status = 500;
fprintf(stderr, "500: %s: extra characters: %s\n",
seconds_behind_master, end);
} else if ((LONG_MIN == ld || LONG_MAX == ld)
&& ERANGE == errno) {
status = 500;
fprintf(stderr, "500: %s out of range of type long\n",
seconds_behind_master);
} else if (ld > INT_MAX) {
status = 500;
fprintf(stderr, "500: %ld greater than INT_MAX\n", ld);
} else if (ld < INT_MIN) {
status = 500;
fprintf(stderr, "500: %ld less than INT_MIN\n", ld);
} else if (ld < 0) {
status = 500;
fprintf(stderr, "500: %ld less than zero\n", ld);
} else {
seconds = (int)ld;
if (seconds <= GOOD_SECONDS_BEHIND) {
status = 200;
} else {
status = 500;
fprintf(stderr, "500: in GOOD_SECONDS_BEHIND\n");
}
}
}
break;
}
mysql_free_result(result);
mysql_close(conn_m);
}
char message[BUFSIZE];
switch (status) {
case 200:
strcpy(message, "HTTP/1.1 200 OK\r\n");
strcat(message, "Content-length: 4\r\n");
strcat(message, "Content-Type: text/plain\r\n\r\n");
strcat(message, "OK\r\n");
break;
case 500:
strcpy(message, "HTTP/1.1 500 Internal Server Error\r\n");
break;
case 503:
strcpy(message, "HTTP/1.1 503 Temporarily unavailable\r\n");
break;
default:
strcpy(message, "HTTP/1.1 502 Bad Gateway\r\n");
break;
}
send(conn_s, message, strlen(message), MSG_NOSIGNAL);
status = DEFAULT_HTTP_CODE; /* resetting status for next round */
close(conn_s);
}
return 0;
}