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/*
ctdb logging code
Copyright (C) Andrew Tridgell 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "../include/ctdb_private.h"
#include "system/syslog.h"
#include "system/time.h"
#include "system/filesys.h"
struct ctdb_log_state {
char *logfile;
int fd, pfd;
char buf[1024];
uint16_t buf_used;
bool use_syslog;
};
/* we need this global to eep the DEBUG() syntax */
static struct ctdb_log_state *log_state;
/*
syslog logging function
*/
static void ctdb_syslog_log(const char *format, va_list ap)
{
int level = LOG_DEBUG;
switch (this_log_level) {
case DEBUG_EMERG:
level = LOG_EMERG;
break;
case DEBUG_ALERT:
level = LOG_ALERT;
break;
case DEBUG_CRIT:
level = LOG_CRIT;
break;
case DEBUG_ERR:
level = LOG_ERR;
break;
case DEBUG_WARNING:
level = LOG_WARNING;
break;
case DEBUG_NOTICE:
level = LOG_NOTICE;
break;
case DEBUG_INFO:
level = LOG_INFO;
break;
default:
level = LOG_DEBUG;
break;
}
vsyslog(level, format, ap);
}
/*
log file logging function
*/
static void ctdb_logfile_log(const char *format, va_list ap)
{
struct timeval t;
char *s = NULL;
struct tm *tm;
char tbuf[100];
char *s2 = NULL;
vasprintf(&s, format, ap);
t = timeval_current();
tm = localtime(&t.tv_sec);
strftime(tbuf,sizeof(tbuf)-1,"%Y/%m/%d %H:%M:%S", tm);
asprintf(&s2, "%s.%06u [%5u]: %s",
tbuf, (unsigned)t.tv_usec, (unsigned)getpid(), s);
free(s);
if (s2) {
write(log_state->fd, s2, strlen(s2));
free(s2);
}
}
/*
choose the logfile location
*/
int ctdb_set_logfile(struct ctdb_context *ctdb, const char *logfile, bool use_syslog)
{
ctdb->log = talloc_zero(ctdb, struct ctdb_log_state);
log_state = ctdb->log;
if (use_syslog) {
do_debug_v = ctdb_syslog_log;
ctdb->log->use_syslog = true;
} else if (logfile == NULL || strcmp(logfile, "-") == 0) {
do_debug_v = ctdb_logfile_log;
ctdb->log->fd = 1;
/* also catch stderr of subcommands to stdout */
dup2(1, 2);
} else {
do_debug_v = ctdb_logfile_log;
ctdb->log->logfile = talloc_strdup(ctdb, logfile);
ctdb->log->fd = open(logfile, O_WRONLY|O_APPEND|O_CREAT, 0666);
if (ctdb->log->fd == -1) {
printf("Failed to open logfile %s\n", ctdb->logfile);
abort();
}
}
return 0;
}
/*
called when log data comes in from a child process
*/
static void ctdb_log_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *private)
{
struct ctdb_context *ctdb = talloc_get_type(private, struct ctdb_context);
char *p;
int n;
if (!(flags & EVENT_FD_READ)) {
return;
}
n = read(ctdb->log->pfd, &ctdb->log->buf[ctdb->log->buf_used],
sizeof(ctdb->log->buf) - ctdb->log->buf_used);
if (n > 0) {
ctdb->log->buf_used += n;
}
while (ctdb->log->buf_used > 0 &&
(p = memchr(ctdb->log->buf, '\n', ctdb->log->buf_used)) != NULL) {
int n1 = (p - ctdb->log->buf)+1;
int n2 = n1 - 1;
/* swallow \r from child processes */
if (n2 > 0 && ctdb->log->buf[n2-1] == '\r') {
n2--;
}
do_debug("%*.*s\n", n2, n2, ctdb->log->buf);
memmove(ctdb->log->buf, p+1, sizeof(ctdb->log->buf) - n1);
ctdb->log->buf_used -= n1;
}
/* the buffer could have completely filled - unfortunately we have
no choice but to dump it out straight away */
if (ctdb->log->buf_used == sizeof(ctdb->log->buf)) {
do_debug("%*.*s\n",
(int)ctdb->log->buf_used, (int)ctdb->log->buf_used, ctdb->log->buf);
ctdb->log->buf_used = 0;
}
}
/*
setup for logging of child process stdout
*/
int ctdb_set_child_logging(struct ctdb_context *ctdb)
{
int p[2];
if (ctdb->log->fd == 1) {
/* not needed for stdout logging */
return 0;
}
/* setup a pipe to catch IO from subprocesses */
if (pipe(p) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to setup for child logging pipe\n"));
return -1;
}
event_add_fd(ctdb->ev, ctdb, p[0], EVENT_FD_READ,
ctdb_log_handler, ctdb);
set_close_on_exec(p[0]);
ctdb->log->pfd = p[0];
close(1);
close(2);
if (p[1] != 1) {
dup2(p[1], 1);
close(p[1]);
}
/* also catch stderr of subcommands to the log */
dup2(1, 2);
return 0;
}
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