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/* ISC license. */
#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <skalibs/posixplz.h>
#include <skalibs/uint16.h>
#include <skalibs/uint64.h>
#include <skalibs/buffer.h>
#include <skalibs/stralloc.h>
#include <skalibs/tai.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#include <skalibs/gensetdyn.h>
#include <s6-dns/dcache.h>
static int write_node_iter (char *data, void *aux)
{
dcache_node_t *y = (dcache_node_t *)data ;
buffer *b = aux ;
char pack[TAI_PACK * 2 + 4] ;
tai_pack(pack, tain_secp(&y->entry)) ;
tai_pack(pack + TAI_PACK, tain_secp(&y->expire)) ;
uint16_pack(pack + TAI_PACK * 2, y->key.len) ;
uint16_pack(pack + TAI_PACK * 2 + 2, y->datalen) ;
if (buffer_put(b, pack, TAI_PACK * 2 + 4) == -1) return 0 ;
if (buffer_put(b, y->key.s, y->key.len + y->datalen) == -1) return 0 ;
if (buffer_put(b, "", 1) == -1) return 0 ;
return 1 ;
}
static inline int dcache_save_to_buffer (dcache_t const *z, buffer *b)
{
char pack[16] ;
if (buffer_puts(b, DCACHE_MAGIC) == -1) return 0 ;
uint64_pack_big(pack, z->size) ;
uint64_pack_big(pack + 8, z->motion) ;
if (buffer_put(b, pack, 16) < 16) return 0 ;
/* XXX: can gensetdyn_iter blow up the stack if z->storage is huge? */
if (gensetdyn_iter_nocancel((gensetdyn *)&z->storage, gensetdyn_n(&z->storage), &write_node_iter, b) < gensetdyn_n(&z->storage)) return 0 ;
return buffer_flush(b) ;
}
#define N 8192
int dcache_save (dcache_t const *z, char const *file)
{
stralloc sa = STRALLOC_ZERO ;
int fd ;
buffer b ;
char buf[N] ;
if (!stralloc_cats(&sa, file)) return 0 ;
if (!sauniquename(&sa) || !stralloc_0(&sa)) goto err0 ;
fd = open_excl(sa.s) ;
if (fd == -1) goto err0 ;
buffer_init(&b, &buffer_write, fd, buf, N) ;
if (!dcache_save_to_buffer(z, &b) || fsync(fd) < 0) goto err2 ;
fd_close(fd) ;
if (rename(sa.s, file) == -1) goto err1 ;
stralloc_free(&sa) ;
return 1 ;
err2:
fd_close(fd) ;
err1:
unlink_void(sa.s) ;
err0:
stralloc_free(&sa) ;
return 0 ;
}
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