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/*
ctdb logging code
Copyright (C) Ronnie Sahlberg 2009
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 "lib/tdb/include/tdb.h"
#include "system/time.h"
#include "../include/ctdb_private.h"
#include "../include/ctdb.h"
int log_ringbuf_size;
#define MAX_LOG_SIZE 128
static int first_entry;
static int last_entry;
struct ctdb_log_entry {
int32_t level;
struct timeval t;
char message[MAX_LOG_SIZE];
};
static struct ctdb_log_entry *log_entries;
/*
* this function logs all messages for all levels to a ringbuffer
*/
static void log_ringbuffer_v(const char *format, va_list ap)
{
int ret;
if (log_entries == NULL && log_ringbuf_size != 0) {
/* Hope this works. We cant log anything if it doesnt anyway */
log_entries = malloc(sizeof(struct ctdb_log_entry) * log_ringbuf_size);
}
if (log_entries == NULL) {
return;
}
log_entries[last_entry].message[0] = '\0';
ret = vsnprintf(&log_entries[last_entry].message[0], MAX_LOG_SIZE, format, ap);
if (ret == -1) {
return;
}
log_entries[last_entry].level = this_log_level;
log_entries[last_entry].t = timeval_current();
last_entry++;
if (last_entry >= log_ringbuf_size) {
last_entry = 0;
}
if (first_entry == last_entry) {
first_entry++;
}
if (first_entry >= log_ringbuf_size) {
first_entry = 0;
}
}
void log_ringbuffer(const char *format, ...)
{
va_list ap;
va_start(ap, format);
log_ringbuffer_v(format, ap);
va_end(ap);
}
static void ctdb_collect_log(struct ctdb_context *ctdb, struct ctdb_get_log_addr *log_addr)
{
TDB_DATA data;
FILE *f;
long fsize;
int tmp_entry;
int count = 0;
DEBUG(DEBUG_ERR,("Marshalling log entries first:%d last:%d\n", first_entry, last_entry));
/* dump to a file, then send the file as a blob */
f = tmpfile();
if (f == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Unable to open tmpfile - %s\n", strerror(errno)));
return;
}
tmp_entry = first_entry;
while (tmp_entry != last_entry) {
struct tm *tm;
char tbuf[100];
if (log_entries == NULL) {
break;
}
if (log_entries[tmp_entry].level > log_addr->level) {
tmp_entry++;
if (tmp_entry >= log_ringbuf_size) {
tmp_entry = 0;
}
continue;
}
tm = localtime(&log_entries[tmp_entry].t.tv_sec);
strftime(tbuf, sizeof(tbuf)-1,"%Y/%m/%d %H:%M:%S", tm);
if (log_entries[tmp_entry].message) {
count += fprintf(f, "%s:%s %s", tbuf, get_debug_by_level(log_entries[tmp_entry].level), log_entries[tmp_entry].message);
}
tmp_entry++;
if (tmp_entry >= log_ringbuf_size) {
tmp_entry = 0;
}
}
fsize = ftell(f);
rewind(f);
data.dptr = talloc_size(NULL, fsize);
CTDB_NO_MEMORY_VOID(ctdb, data.dptr);
data.dsize = fread(data.dptr, 1, fsize, f);
fclose(f);
DEBUG(DEBUG_ERR,("Marshalling log entries into a blob of %d bytes\n", (int)data.dsize));
DEBUG(DEBUG_ERR,("Send log to %d:%d\n", (int)log_addr->pnn, (int)log_addr->srvid));
ctdb_send_message(ctdb, log_addr->pnn, log_addr->srvid, data);
talloc_free(data.dptr);
}
int32_t ctdb_control_get_log(struct ctdb_context *ctdb, TDB_DATA addr)
{
struct ctdb_get_log_addr *log_addr = (struct ctdb_get_log_addr *)addr.dptr;
pid_t child;
/* spawn a child process to marshall the huge log blob and send it back
to the ctdb tool using a MESSAGE
*/
child = fork();
if (child == (pid_t)-1) {
DEBUG(DEBUG_ERR,("Failed to fork a log collector child\n"));
return -1;
}
if (child == 0) {
if (switch_from_server_to_client(ctdb) != 0) {
DEBUG(DEBUG_CRIT, (__location__ "ERROR: failed to switch log collector child into client mode.\n"));
_exit(1);
}
ctdb_collect_log(ctdb, log_addr);
_exit(0);
}
return 0;
}
int32_t ctdb_control_clear_log(struct ctdb_context *ctdb)
{
first_entry = 0;
last_entry = 0;
return 0;
}
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