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cachesyncd
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new event system

master
Olaf Rempel 13 years ago
parent
a0657aad83
commit
3bffc2c201
7 changed files with 416 additions and 129 deletions
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  1. +1
    -1
      Makefile
  2. +78
    -12
      cachesyncd.c
  3. +310
    -0
      event.c
  4. +26
    -0
      event.h
  5. +1
    -1
      multicast.c
  6. +0
    -109
      selector.c
  7. +0
    -6
      selector.h

+ 1
- 1
Makefile View File

@@ -1,6 +1,6 @@
# Toplevel Makefile

SRC := cachesyncd.c configfile.c logging.c multicast.c selector.c unixsock.c
SRC := cachesyncd.c configfile.c event.c logging.c multicast.c unixsock.c
CFLAGS := -O2 -Wall

# ############################


+ 78
- 12
cachesyncd.c View File

@@ -25,15 +25,21 @@
#include <getopt.h>
#include <sys/stat.h>

#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>

#include "configfile.h"
#include "logging.h"
#include "selector.h"
#include "event.h"
#include "multicast.h"
#include "unixsock.h"

#define DEFAULT_CONFIG "cachesyncd.conf"
#define DEFAULT_LOGFILE "cachesyncd.log"

#define BUF_SIZE 256

static struct option opts[] = {
{"config", 1, 0, 'c'},
{"debug", 0, 0, 'd'},
@@ -41,6 +47,59 @@ static struct option opts[] = {
{0, 0, 0, 0}
};

static int usock, msock;
static char *buf;

int usock_read_callback(int fd, void *privdata)
{
int len = read(fd, buf, BUF_SIZE);
if (len <= 0) {
close(fd);
return -1;
}

mcast_send(msock, buf, len);
return 0;
}

int usock_accept_callback(int fd, void *privdata)
{
int con = accept(usock, NULL, NULL);
if (con < 0 ) {
log_print(LOG_ERROR, "selector: accept()");
return 0;
}

event_add_readfd(con, usock_read_callback, NULL);
return 0;
}

int msock_read_callback(int fd, void *privdata)
{
int len = read(fd, buf, BUF_SIZE);
if (len <= 0) {
log_print(LOG_ERROR, "selector: multicast sock closed?");

} else if (!strncmp(buf, "KEEPALIVE", 10)) {
// nothing

} else if (!strncmp(buf, "DELETE ", 7)) {
log_print(LOG_DEBUG, "delete '%s'", buf +7);
//delete_file(buf +7);

} else {
log_print(LOG_DEBUG, "recv unknown cmd via multicast: '%s'", buf);
}

return 0;
}

int msock_keepalive_timeout(void *privdata)
{
mcast_send(msock, "KEEPALIVE", 10);
return 0;
}

int main(int argc, char *argv[])
{
char *config = DEFAULT_CONFIG;
@@ -92,25 +151,32 @@ int main(int argc, char *argv[])
daemon(-1, 0);
}

// logfile (absolute filename, dropped privs???)
// (daemon)
// chroot (needs root)
// msockinit (needs root)
// setgid/pid (drop privs)
// usockinit (dropped privs, relative path)
// selector/unlink (dropped privs, relative path)

log_print(LOG_EVERYTIME, "cachesyncd started (pid: %d)", getpid());

int usock = sock_init();
buf = malloc(BUF_SIZE);
if (buf == NULL) {
log_print(LOG_ERROR, "selector: out of memory");
return -1;
}

usock = sock_init();
if (usock < 0)
return -1;

int msock = mcast_init();
msock = mcast_init();
if (msock < 0)
return -1;

selector(usock, msock);
event_add_readfd(usock, usock_accept_callback, NULL);
event_add_readfd(msock, msock_read_callback, NULL);

struct timeval tv;
tv.tv_sec = 60;
tv.tv_usec = 0;

event_add_timeout(&tv, msock_keepalive_timeout, NULL);

event_loop();

return 0;
}

+ 310
- 0
event.c View File

@@ -0,0 +1,310 @@
/***************************************************************************
* Copyright (C) 10/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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 2 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, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <sys/time.h>
#include <sys/types.h>

#include "list.h"
#include "logging.h"

#include "event.h"

static LIST_HEAD(readfd_list);
static LIST_HEAD(writefd_list);
static LIST_HEAD(exceptfd_list);
static LIST_HEAD(timeout_list);

struct fd_entry {
struct list_head list;
int fd;
int type;
int (*callback)(int fd, void *privdata);
void *privdata;
};

struct timeout_entry {
struct list_head list;
struct timeval timeout;
struct timeval nextrun;
int (*callback)(void *privdata);
void *privdata;
};

int event_add_fd(int fd, int type, int (*callback)(int fd, void *privdata), void *privdata)
{
if (fd < 0 || fd > FD_SETSIZE)
return -1;

struct fd_entry *entry;
entry = malloc(sizeof(struct fd_entry));
if (entry == NULL) {
log_print(LOG_ERROR, "event_add_fd(): out of memory");
return -1;
}

entry->fd = fd;
entry->type = type;
entry->callback = callback;
entry->privdata = privdata;

switch (type) {
case FD_READ:
list_add_tail(&entry->list, &readfd_list);
break;

case FD_WRITE:
list_add_tail(&entry->list, &writefd_list);
break;

case FD_EXCEPT:
list_add_tail(&entry->list, &exceptfd_list);
break;

default:
log_print(LOG_ERROR, "add_fd(): unknown type");
free(entry);
return -1;
}

return 0;
}

int event_remove_fd(int fd)
{
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &readfd_list, list) {
if (entry->fd == fd) {
list_del(&entry->list);
free(entry);
return 0;
}
}

list_for_each_entry_safe(entry, tmp, &writefd_list, list) {
if (entry->fd == fd) {
list_del(&entry->list);
free(entry);
return 0;
}
}

list_for_each_entry_safe(entry, tmp, &exceptfd_list, list) {
if (entry->fd == fd) {
list_del(&entry->list);
free(entry);
return 0;
}
}

return -1;
}

static void calc_nextrun(struct timeval *timeout, struct timeval *nextrun)
{
struct timeval now;
gettimeofday(&now, NULL);

nextrun->tv_usec = now.tv_usec + timeout->tv_usec;
nextrun->tv_sec = now.tv_sec + timeout->tv_sec;

if (nextrun->tv_usec >= 1000000) {
nextrun->tv_usec -= 1000000;
nextrun->tv_sec++;
}
}

static void calc_timeout(struct timeval *timeout, struct timeval *nextrun)
{
struct timeval now;
gettimeofday(&now, NULL);

timeout->tv_usec = nextrun->tv_usec - now.tv_usec;
timeout->tv_sec = nextrun->tv_sec - now.tv_sec;

if (timeout->tv_usec < 0) {
timeout->tv_usec += 1000000;
timeout->tv_sec--;
}
}

static void schedule_nextrun(struct timeout_entry *entry)
{
struct timeout_entry *search;

list_for_each_entry(search, &timeout_list, list) {
if (search->nextrun.tv_sec > entry->nextrun.tv_sec) {
list_add_tail(&entry->list, &search->list);
return;

} else if (search->nextrun.tv_sec == entry->nextrun.tv_sec &&
search->nextrun.tv_usec > entry->nextrun.tv_usec) {
list_add_tail(&entry->list, &search->list);
return;
}
}
list_add_tail(&entry->list, &timeout_list);
}

int event_add_timeout(struct timeval *timeout, int (*callback)(void *privdata), void *privdata)
{
struct timeout_entry *entry;
entry = malloc(sizeof(struct timeout_entry));
if (entry == NULL) {
log_print(LOG_ERROR, "event_add_timeout(): out of memory");
return -1;
}

memcpy(&entry->timeout, timeout, sizeof(entry->timeout));
entry->callback = callback;
entry->privdata = privdata;

calc_nextrun(&entry->timeout, &entry->nextrun);
schedule_nextrun(entry);
return 0;
}

int event_loop(void)
{
while (1) {
fd_set readfds, *readfds_p = NULL;
fd_set writefds, *writefds_p = NULL;
fd_set exceptfds, *exceptfds_p =NULL;
struct timeval timeout, *timeout_p = NULL;

if (!list_empty(&readfd_list)) {
struct fd_entry *entry;

FD_ZERO(&readfds);
list_for_each_entry(entry, &readfd_list, list)
FD_SET(entry->fd, &readfds);

readfds_p = &readfds;
}

if (!list_empty(&writefd_list)) {
struct fd_entry *entry;

FD_ZERO(&writefds);
list_for_each_entry(entry, &writefd_list, list)
FD_SET(entry->fd, &writefds);

writefds_p = &writefds;
}

if (!list_empty(&exceptfd_list)) {
struct fd_entry *entry;

FD_ZERO(&exceptfds);
list_for_each_entry(entry, &exceptfd_list, list)
FD_SET(entry->fd, &exceptfds);

exceptfds_p = &exceptfds;
}

if (!list_empty(&timeout_list)) {
struct timeout_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &timeout_list, list) {

calc_timeout(&timeout, &entry->nextrun);
if (timeout.tv_sec >= 0 && timeout.tv_usec > 0) {
timeout_p = &timeout;
break;
}

// delayed timeout, exec NOW!
list_del(&entry->list);
int ret = entry->callback(entry->privdata);
if (ret == 0) {
calc_nextrun(&entry->timeout, &entry->nextrun);
schedule_nextrun(entry);

} else {
free(entry);
}
}
}

int i = select(FD_SETSIZE, readfds_p, writefds_p, exceptfds_p, timeout_p);
if (i < 0) {
/* On error, -1 is returned, and errno is set
* appropriately; the sets and timeout become
* undefined, so do not rely on their contents
* after an error.
*/
continue;

} else if (i == 0 && !list_empty(&timeout_list)) {
struct timeout_entry *entry;
entry = list_entry(timeout_list.next, typeof(*entry), list);
list_del(&entry->list);

int ret = entry->callback(entry->privdata);
if (ret == 0) {
calc_nextrun(&entry->timeout, &entry->nextrun);
schedule_nextrun(entry);

} else {
free(entry);
}
}

if (readfds_p) {
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &readfd_list, list) {
if (!FD_ISSET(entry->fd, &readfds))
continue;

if (entry->callback(entry->fd, entry->privdata) != 0) {
list_del(&entry->list);
free(entry);
}
}
}

if (writefds_p) {
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &writefd_list, list) {
if (FD_ISSET(entry->fd, &writefds))
continue;

if (entry->callback(entry->fd, entry->privdata) != 0) {
list_del(&entry->list);
free(entry);
}
}
}

if (exceptfds_p) {
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &exceptfd_list, list) {
if (FD_ISSET(entry->fd, &exceptfds))
continue;

if (entry->callback(entry->fd, entry->privdata) != 0) {
list_del(&entry->list);
free(entry);
}
}
}
}
}

+ 26
- 0
event.h View File

@@ -0,0 +1,26 @@
#ifndef _EVENT_H_
#define _EVENT_H_

#include <sys/time.h>

#define FD_READ 0x01
#define FD_WRITE 0x02
#define FD_EXCEPT 0x04

#define event_add_readfd(fd, callback, privdata) \
event_add_fd(fd, FD_READ, callback, privdata)

#define event_add_writefd(fd, callback, privdata) \
event_add_fd(fd, FD_WRITE, callback, privdata)

#define event_add_exceptfd(fd, callback, privdata) \
event_add_fd(fd, FD_EXCEPT, callback, privdata)

int event_add_fd(int fd, int type, int (*callback)(int fd, void *privdata), void *privdata);
int event_add_timeout(struct timeval *timeout, int (*callback)(void *privdata), void *privdata);

int event_remove_fd(int fd);

int event_loop(void);

#endif /* _EVENT_H_ */

+ 1
- 1
multicast.c View File

@@ -96,7 +96,7 @@ int mcast_init()
return -1;
}

char loop = 1;
char loop = 0;
if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop))) {
log_print(LOG_WARN, "mcast_init: setsockopt(IP_MULTICAST_LOOP)");
close(sockfd);


+ 0
- 109
selector.c View File

@@ -1,109 +0,0 @@
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>

#include "list.h"
#include "logging.h"
#include "multicast.h"
#include "unixsock.h"

#define BUF_SIZE 256

struct fd_entry {
struct list_head list;
int fd;
};

static LIST_HEAD(fd_list);

void selector(int usock, int msock)
{
fd_set fdsel;

char *buf = malloc(BUF_SIZE);
if (buf == NULL) {
log_print(LOG_ERROR, "selector: out of memory");
return;
}

while (1) {
struct timeval tv;
struct fd_entry *entry, *entry_safe;

FD_ZERO(&fdsel);
FD_SET(usock, &fdsel);
FD_SET(msock, &fdsel);

list_for_each_entry(entry, &fd_list, list) {
FD_SET(entry->fd, &fdsel);
}

tv.tv_sec = 60;
tv.tv_usec = 0;

int ret = select(FD_SETSIZE, &fdsel, NULL, NULL, &tv);
if (ret < 0) {
log_print(LOG_ERROR, "selector: select()");
continue;

} else if (ret == 0) {
mcast_send(msock, "KEEPALIVE", 10);
}

if (FD_ISSET(msock, &fdsel)) {
int len = read(msock, buf, BUF_SIZE);
if (len <= 0) {
log_print(LOG_ERROR, "selector: multicast sock closed?");

} else if (!strncmp(buf, "KEEPALIVE", 10)) {
// nothing

} else if (!strncmp(buf, "DELETE ", 7)) {
log_print(LOG_DEBUG, "delete '%s'", buf +7);
// delete_file(buf +7);

} else {
log_print(LOG_DEBUG, "recv unknown cmd via multicast: '%s'", buf);
}
}

if (FD_ISSET(usock, &fdsel)) {
int usock_con;

usock_con = accept(usock, NULL, NULL);
if (usock_con != -1) {
entry = malloc(sizeof(struct fd_entry));
if (entry) {
entry->fd = usock_con;
list_add_tail(&entry->list, &fd_list);
} else {
log_print(LOG_ERROR, "selector: out of memory");
close(usock_con);
}

} else {
log_print(LOG_ERROR, "selector: accept()");
}
}

list_for_each_entry_safe(entry, entry_safe, &fd_list, list) {
if (FD_ISSET(entry->fd, &fdsel)) {
int len = read(entry->fd, buf, BUF_SIZE);
if (len <= 0) {
list_del(&entry->list);
close(entry->fd);
free(entry);

} else {
mcast_send(msock, buf, len);
}
}
}
}
msock_close(msock);
sock_close(usock);
}

+ 0
- 6
selector.h View File

@@ -1,6 +0,0 @@
#ifndef _SELECTOR_H_
#define _SELECTOR_H_

void selector(int usock, int msock);

#endif // _SELECTOR_H_

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