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rotater.c
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rotater.c
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/*
* This file is part of the zlog Library.
*
* Copyright (C) 2011 by Hardy Simpson <HardySimpson1984@gmail.com>
*
* Licensed under the LGPL v2.1, see the file COPYING in base directory.
*/
#include <string.h>
#include <glob.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#include "zc_defs.h"
#include "rotater.h"
#define ROLLING 1 /* aa.02->aa.03, aa.01->aa.02, aa->aa.01 */
#define SEQUENCE 2 /* aa->aa.03 */
typedef struct {
int index;
char path[MAXLEN_PATH + 1];
} zlog_file_t;
void zlog_rotater_profile(zlog_rotater_t * a_rotater, int flag)
{
zc_assert(a_rotater,);
zc_profile(flag, "--rotater[%p][%p,%s,%d][%s,%s,%s,%ld,%ld,%d,%d,%d]--",
a_rotater,
&(a_rotater->lock_mutex),
a_rotater->lock_file,
a_rotater->lock_fd,
a_rotater->base_path,
a_rotater->archive_path,
a_rotater->glob_path,
(long)a_rotater->num_start_len,
(long)a_rotater->num_end_len,
a_rotater->num_width,
a_rotater->mv_type,
a_rotater->max_count
);
if (a_rotater->files) {
int i;
zlog_file_t *a_file;
zc_arraylist_foreach(a_rotater->files, i, a_file) {
zc_profile(flag, "[%s,%d]->", a_file->path, a_file->index);
}
}
return;
}
/*******************************************************************************/
void zlog_rotater_del(zlog_rotater_t *a_rotater)
{
zc_assert(a_rotater,);
if (a_rotater->lock_fd) {
if (close(a_rotater->lock_fd)) {
zc_error("close fail, errno[%d]", errno);
}
}
if (pthread_mutex_destroy(&(a_rotater->lock_mutex))) {
zc_error("pthread_mutex_destroy fail, errno[%d]", errno);
}
free(a_rotater);
zc_debug("zlog_rotater_del[%p]", a_rotater);
return;
}
zlog_rotater_t *zlog_rotater_new(char *lock_file)
{
int fd = 0;
zlog_rotater_t *a_rotater;
zc_assert(lock_file, NULL);
a_rotater = calloc(1, sizeof(zlog_rotater_t));
if (!a_rotater) {
zc_error("calloc fail, errno[%d]", errno);
return NULL;
}
if (pthread_mutex_init(&(a_rotater->lock_mutex), NULL)) {
zc_error("pthread_mutex_init fail, errno[%d]", errno);
free(a_rotater);
return NULL;
}
/* depends on umask of the user here
* if user A create /tmp/zlog.lock 0600
* user B is unable to read /tmp/zlog.lock
* B has to choose another lock file except /tmp/zlog.lock
*/
fd = open(lock_file, O_RDWR | O_CREAT,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (fd < 0) {
zc_error("open file[%s] fail, errno[%d]", lock_file, errno);
goto err;
}
a_rotater->lock_fd = fd;
a_rotater->lock_file = lock_file;
//zlog_rotater_profile(a_rotater, ZC_DEBUG);
return a_rotater;
err:
zlog_rotater_del(a_rotater);
return NULL;
}
/*******************************************************************************/
static void zlog_file_del(zlog_file_t * a_file)
{
zc_debug("del onefile[%p]", a_file);
zc_debug("a_file->path[%s]", a_file->path);
free(a_file);
}
static zlog_file_t *zlog_file_check_new(zlog_rotater_t * a_rotater, const char *path)
{
int nwrite;
int nread;
zlog_file_t *a_file;
/* base_path will not be in list */
if (STRCMP(a_rotater->base_path, ==, path)) {
return NULL;
}
/* omit dirs */
if ((path)[strlen(path) - 1] == '/') {
return NULL;
}
a_file = calloc(1, sizeof(zlog_file_t));
if (!a_file) {
zc_error("calloc fail, errno[%d]", errno);
return NULL;
}
nwrite = snprintf(a_file->path, sizeof(a_file->path), "%s", path);
if (nwrite < 0 || nwrite >= sizeof(a_file->path)) {
zc_error("snprintf fail or overflow, nwrite=[%d], errno[%d]", nwrite, errno);
goto err;
}
nread = 0;
sscanf(a_file->path + a_rotater->num_start_len, "%d%n", &(a_file->index), &(nread));
if (a_rotater->num_width != 0) {
if (nread < a_rotater->num_width) {
zc_warn("aa.1.log is not expect, need aa.01.log");
goto err;
}
} /* else all file is ok */
return a_file;
err:
free(a_file);
return NULL;
}
static int zlog_file_cmp(zlog_file_t * a_file_1, zlog_file_t * a_file_2)
{
return (a_file_1->index > a_file_2->index);
}
static int zlog_rotater_add_archive_files(zlog_rotater_t * a_rotater)
{
int rc = 0;
glob_t glob_buf;
size_t pathc;
char **pathv;
zlog_file_t *a_file;
a_rotater->files = zc_arraylist_new((zc_arraylist_del_fn)zlog_file_del);
if (!a_rotater->files) {
zc_error("zc_arraylist_new fail");
return -1;
}
/* scan file which is aa.*.log and aa */
rc = glob(a_rotater->glob_path, GLOB_ERR | GLOB_MARK | GLOB_NOSORT, NULL, &glob_buf);
if (rc == GLOB_NOMATCH) {
goto exit;
} else if (rc) {
zc_error("glob err, rc=[%d], errno[%d]", rc, errno);
return -1;
}
pathv = glob_buf.gl_pathv;
pathc = glob_buf.gl_pathc;
/* check and find match aa.[0-9]*.log, depend on num_width */
for (; pathc-- > 0; pathv++) {
a_file = zlog_file_check_new(a_rotater, *pathv);
if (!a_file) {
zc_warn("not the expect pattern file");
continue;
}
/* file in list aa.00, aa.01, aa.02... */
rc = zc_arraylist_sortadd(a_rotater->files,
(zc_arraylist_cmp_fn)zlog_file_cmp, a_file);
if (rc) {
zc_error("zc_arraylist_sortadd fail");
goto err;
}
}
exit:
globfree(&glob_buf);
return 0;
err:
globfree(&glob_buf);
return -1;
}
static int zlog_rotater_seq_files(zlog_rotater_t * a_rotater)
{
int rc = 0;
int nwrite = 0;
int i, j;
zlog_file_t *a_file;
char new_path[MAXLEN_PATH + 1];
zc_arraylist_foreach(a_rotater->files, i, a_file) {
if (a_rotater->max_count > 0
&& i < zc_arraylist_len(a_rotater->files) - a_rotater->max_count) {
/* unlink aa.0 aa.1 .. aa.(n-c) */
rc = unlink(a_file->path);
if (rc) {
zc_error("unlink[%s] fail, errno[%d]",a_file->path , errno);
return -1;
}
continue;
}
}
if (zc_arraylist_len(a_rotater->files) > 0) { /* list is not empty */
a_file = zc_arraylist_get(a_rotater->files, zc_arraylist_len(a_rotater->files)-1);
if (!a_file) {
zc_error("zc_arraylist_get fail");
return -1;
}
j = zc_max(zc_arraylist_len(a_rotater->files)-1, a_file->index) + 1;
} else {
j = 0;
}
/* do the base_path mv */
memset(new_path, 0x00, sizeof(new_path));
nwrite = snprintf(new_path, sizeof(new_path), "%.*s%0*d%s",
(int) a_rotater->num_start_len, a_rotater->glob_path,
a_rotater->num_width, j,
a_rotater->glob_path + a_rotater->num_end_len);
if (nwrite < 0 || nwrite >= sizeof(new_path)) {
zc_error("nwirte[%d], overflow or errno[%d]", nwrite, errno);
return -1;
}
if (rename(a_rotater->base_path, new_path)) {
zc_error("rename[%s]->[%s] fail, errno[%d]", a_rotater->base_path, new_path, errno);
return -1;
}
return 0;
}
static int zlog_rotater_roll_files(zlog_rotater_t * a_rotater)
{
int i;
int rc = 0;
int nwrite;
char new_path[MAXLEN_PATH + 1];
zlog_file_t *a_file;
/* now in the list, aa.0 aa.1 aa.2 aa.02... */
for (i = zc_arraylist_len(a_rotater->files) - 1; i > -1; i--) {
a_file = zc_arraylist_get(a_rotater->files, i);
if (!a_file) {
zc_error("zc_arraylist_get fail");
return -1;
}
if (a_rotater->max_count > 0 && i >= a_rotater->max_count - 1) {
/* remove file.3 >= 3*/
rc = unlink(a_file->path);
if (rc) {
zc_error("unlink[%s] fail, errno[%d]",a_file->path , errno);
return -1;
}
continue;
}
/* begin rename aa.01.log -> aa.02.log , using i, as index in list maybe repeat */
memset(new_path, 0x00, sizeof(new_path));
nwrite = snprintf(new_path, sizeof(new_path), "%.*s%0*d%s",
(int) a_rotater->num_start_len, a_rotater->glob_path,
a_rotater->num_width, i + 1,
a_rotater->glob_path + a_rotater->num_end_len);
if (nwrite < 0 || nwrite >= sizeof(new_path)) {
zc_error("nwirte[%d], overflow or errno[%d]", nwrite, errno);
return -1;
}
if (rename(a_file->path, new_path)) {
zc_error("rename[%s]->[%s] fail, errno[%d]", a_file->path, new_path, errno);
return -1;
}
}
/* do the base_path mv */
memset(new_path, 0x00, sizeof(new_path));
nwrite = snprintf(new_path, sizeof(new_path), "%.*s%0*d%s",
(int) a_rotater->num_start_len, a_rotater->glob_path,
a_rotater->num_width, 0,
a_rotater->glob_path + a_rotater->num_end_len);
if (nwrite < 0 || nwrite >= sizeof(new_path)) {
zc_error("nwirte[%d], overflow or errno[%d]", nwrite, errno);
return -1;
}
if (rename(a_rotater->base_path, new_path)) {
zc_error("rename[%s]->[%s] fail, errno[%d]", a_rotater->base_path, new_path, errno);
return -1;
}
return 0;
}
static int zlog_rotater_parse_archive_path(zlog_rotater_t * a_rotater)
{
int nwrite;
int nread;
char *p;
size_t len;
/* no archive path is set */
if (a_rotater->archive_path[0] == '\0') {
nwrite = snprintf(a_rotater->glob_path, sizeof(a_rotater->glob_path),
"%s.*", a_rotater->base_path);
if (nwrite < 0 || nwrite > sizeof(a_rotater->glob_path)) {
zc_error("nwirte[%d], overflow or errno[%d]", nwrite, errno);
return -1;
}
a_rotater->mv_type = ROLLING;
a_rotater->num_width = 0;
a_rotater->num_start_len = strlen(a_rotater->base_path) + 1;
a_rotater->num_end_len = strlen(a_rotater->base_path) + 2;
return 0;
} else {
/* find the 1st # */
p = strchr(a_rotater->archive_path, '#');
if (!p) {
zc_error("no # in archive_path[%s]", a_rotater->archive_path);
return -1;
}
nread = 0;
sscanf(p, "#%d%n", &(a_rotater->num_width), &nread);
if (nread == 0) nread = 1;
if (*(p+nread) == 'r') {
a_rotater->mv_type = ROLLING;
} else if (*(p+nread) == 's') {
a_rotater->mv_type = SEQUENCE;
} else {
zc_error("#r or #s not found");
return -1;
}
/* copy and substitue #i to * in glob_path*/
len = p - a_rotater->archive_path;
if (len > sizeof(a_rotater->glob_path) - 1) {
zc_error("sizeof glob_path not enough,len[%ld]", (long) len);
return -1;
}
memcpy(a_rotater->glob_path, a_rotater->archive_path, len);
nwrite = snprintf(a_rotater->glob_path + len, sizeof(a_rotater->glob_path) - len,
"*%s", p + nread + 1);
if (nwrite < 0 || nwrite > sizeof(a_rotater->glob_path) - len) {
zc_error("nwirte[%d], overflow or errno[%d]", nwrite, errno);
return -1;
}
a_rotater->num_start_len = len;
a_rotater->num_end_len = len + 1;
}
return 0;
}
static void zlog_rotater_clean(zlog_rotater_t *a_rotater)
{
a_rotater->base_path = NULL;
a_rotater->archive_path = NULL;
a_rotater->max_count = 0;
a_rotater->mv_type = 0;
a_rotater->num_width = 0;
a_rotater->num_start_len = 0;
a_rotater->num_end_len = 0;
memset(a_rotater->glob_path, 0x00, sizeof(a_rotater->glob_path));
if (a_rotater->files) zc_arraylist_del(a_rotater->files);
a_rotater->files = NULL;
}
static int zlog_rotater_lsmv(zlog_rotater_t *a_rotater,
char *base_path, char *archive_path, int archive_max_count)
{
int rc = 0;
a_rotater->base_path = base_path;
a_rotater->archive_path = archive_path;
a_rotater->max_count = archive_max_count;
rc = zlog_rotater_parse_archive_path(a_rotater);
if (rc) {
zc_error("zlog_rotater_parse_archive_path fail");
goto err;
}
rc = zlog_rotater_add_archive_files(a_rotater);
if (rc) {
zc_error("zlog_rotater_add_archive_files fail");
goto err;
}
if (a_rotater->mv_type == ROLLING) {
rc = zlog_rotater_roll_files(a_rotater);
if (rc) {
zc_error("zlog_rotater_roll_files fail");
goto err;
}
} else if (a_rotater->mv_type == SEQUENCE) {
rc = zlog_rotater_seq_files(a_rotater);
if (rc) {
zc_error("zlog_rotater_seq_files fail");
goto err;
}
}
zlog_rotater_clean(a_rotater);
return 0;
err:
zlog_rotater_clean(a_rotater);
return -1;
}
/*******************************************************************************/
static int zlog_rotater_trylock(zlog_rotater_t *a_rotater)
{
int rc;
struct flock fl;
fl.l_type = F_WRLCK;
fl.l_start = 0;
fl.l_whence = SEEK_SET;
fl.l_len = 0;
rc = pthread_mutex_trylock(&(a_rotater->lock_mutex));
if (rc == EBUSY) {
zc_warn("pthread_mutex_trylock fail, as lock_mutex is locked by other threads");
return -1;
} else if (rc != 0) {
zc_error("pthread_mutex_trylock fail, rc[%d]", rc);
return -1;
}
if (fcntl(a_rotater->lock_fd, F_SETLK, &fl)) {
if (errno == EAGAIN || errno == EACCES) {
/* lock by other process, that's right, go on */
/* EAGAIN on linux */
/* EACCES on AIX */
zc_warn("fcntl lock fail, as file is lock by other process");
} else {
zc_error("lock fd[%d] fail, errno[%d]", a_rotater->lock_fd, errno);
}
if (pthread_mutex_unlock(&(a_rotater->lock_mutex))) {
zc_error("pthread_mutex_unlock fail, errno[%d]", errno);
}
return -1;
}
return 0;
}
static int zlog_rotater_unlock(zlog_rotater_t *a_rotater)
{
int rc = 0;
struct flock fl;
fl.l_type = F_UNLCK;
fl.l_start = 0;
fl.l_whence = SEEK_SET;
fl.l_len = 0;
if (fcntl(a_rotater->lock_fd, F_SETLK, &fl)) {
rc = -1;
zc_error("unlock fd[%s] fail, errno[%d]", a_rotater->lock_fd, errno);
}
if (pthread_mutex_unlock(&(a_rotater->lock_mutex))) {
rc = -1;
zc_error("pthread_mutext_unlock fail, errno[%d]", errno);
}
return rc;
}
int zlog_rotater_rotate(zlog_rotater_t *a_rotater,
char *base_path, size_t msg_len,
char *archive_path, long archive_max_size, int archive_max_count)
{
int rc = 0;
struct zlog_stat info;
zc_assert(base_path, -1);
if (zlog_rotater_trylock(a_rotater)) {
zc_warn("zlog_rotater_trylock fail, maybe lock by other process or threads");
return 0;
}
if (stat(base_path, &info)) {
rc = -1;
zc_error("stat [%s] fail, errno[%d]", base_path, errno);
goto exit;
}
if (info.st_size + msg_len <= archive_max_size) {
/* file not so big,
* may alread rotate by oth process or thread,
* return */
rc = 0;
goto exit;
}
/* begin list and move files */
rc = zlog_rotater_lsmv(a_rotater, base_path, archive_path, archive_max_count);
if (rc) {
zc_error("zlog_rotater_lsmv [%s] fail, return", base_path);
rc = -1;
} /* else if (rc == 0) */
//zc_debug("zlog_rotater_file_ls_mv success");
exit:
/* unlock file */
if (zlog_rotater_unlock(a_rotater)) {
zc_error("zlog_rotater_unlock fail");
}
return rc;
}
/*******************************************************************************/