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#include "bbs.h"
#include <err.h>
#include <avltree.h>
int toaccept(int port);
void usage(void);
ssize_t Read(int fd, void *buf, size_t nbytes);
ssize_t Write(int fd, void *BUF, size_t nbytes)
{
char *buf = (char *)BUF;
size_t thisgot, totalgot = nbytes;
while( nbytes > 0 ){
if( (thisgot = write(fd, buf, nbytes)) <= 0 )
err(1, "read from socket: ");
nbytes -= thisgot;
buf += thisgot;
}
return totalgot;
}
int main(int argc, char **argv)
{
int sfd, len;
int port = -1;
char ch;
OCbuf_t OCbuf;
AVL_IX_DESC ix;
AVL_IX_REC pe;
OCstore_t *store;
//avl_create_index(&ix, AVL_COUNT_DUPS, OC_KEYLEN);
avl_create_index(&ix, AVL_COUNT_DUPS, 5);
while( (ch = getopt(argc, argv, "p:")) != -1 )
switch( ch ){
case 'p':
port = atoi(optarg);
break;
}
if( port == -1 )
usage();
while( 1 ){
sfd = toaccept(port);
Read(sfd, &len, sizeof(len));
printf("reading %d bytes\n", len);
Read(sfd, &OCbuf, len);
printf("read! pid: %d\n", OCbuf.key.pid);
memset(&pe, 0, sizeof(pe));
if( OCbuf.key.pid <= 1 ){
/* garbage collection */
}
else if( OCbuf.key.pid < OC_pidadd ){
/* store */
puts("swapin");
len = OC_HEADERLEN + OCbuf.length;
store = (OCstore_t *)malloc(sizeof(time_t) + len);
store->mtime = time(NULL);
memcpy(&(store->data), &OCbuf, len);
pe.recptr = (void *)store;
memcpy(pe.key, &OCbuf.key, OC_KEYLEN);
if( avl_add_key(&pe, &ix) != AVL_IX_OK )
puts("add key error");
}
else {
OCbuf.key.pid -= OC_pidadd;
memcpy(pe.key, &OCbuf.key, OC_KEYLEN);
if( avl_find_key(&pe, &ix) == AVL_IX_OK ){
store = (OCstore_t *)pe.recptr;
len = store->data.length + OC_HEADERLEN;
Write(sfd, &len, sizeof(len));
Write(sfd, &(store->data), len);
free(store);
if( avl_delete_key(&pe, &ix) != AVL_IX_OK )
puts("delete key error");
}
else
puts("error");
}
close(sfd);
}
return 0;
}
int toaccept(int port)
{
static int sockfd = 0, len;
int cfd, val;
struct sockaddr_in servaddr, clientaddr;
if( sockfd == 0 ){
if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
err(1, NULL);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, (char *)&val, sizeof(val));
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(port);
if( bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0 )
err(1, NULL);
if( listen(sockfd, 5) < 0 )
err(1, NULL);
len = sizeof(struct sockaddr_in);
}
while( (cfd = accept(sockfd, (struct sockaddr *)&clientaddr, &len)) <= 0 )
;
return cfd;
}
void usage(void)
{
fprintf(stderr,
"usage:\tcacheserver [options]\n"
"-p port\tlistenport\n");
exit(0);
}
ssize_t Read(int fd, void *BUF, size_t nbytes)
{
char *buf = (char *)BUF;
ssize_t thisgot, totalgot = nbytes;
while( nbytes > 0 ){
if( (thisgot = read(fd, buf, nbytes)) <= 0 )
err(1, "read from socket: ");
nbytes -= thisgot;
buf += thisgot;
}
return totalgot;
}
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