| /*
* Sai push - src/push/pu-state.c
*
* Copyright (C) 2026 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* For each target branch, the last event promoted to it on the primary
* remote is remembered in <repo-cache>/sai-push-state.json, so that across
* restarts too, an event whose notification arrived before that one's is
* never promoted over it.
*/
#include <libwebsockets.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include "pu-private.h"
typedef struct saip_state_entry {
lws_dll2_t list;
char fetchurl[96];
char branch[65];
char hash[65];
char uuid[65];
uint64_t received;
} saip_state_entry_t;
typedef struct saip_state {
lws_dll2_owner_t entries; /* saip_state_entry_t */
} saip_state_t;
static const lws_struct_map_t lsm_saip_state_entry[] = {
LSM_CARRAY (saip_state_entry_t, fetchurl, "fetchurl"),
LSM_CARRAY (saip_state_entry_t, branch, "branch"),
LSM_CARRAY (saip_state_entry_t, hash, "hash"),
LSM_CARRAY (saip_state_entry_t, uuid, "uuid"),
LSM_UNSIGNED (saip_state_entry_t, received, "received"),
};
static const lws_struct_map_t lsm_saip_state[] = {
LSM_LIST (saip_state_t, entries, saip_state_entry_t, list,
NULL, lsm_saip_state_entry, "promoted"),
};
static const lws_struct_map_t lsm_saip_state_schema[] = {
LSM_SCHEMA (saip_state_t, NULL, lsm_saip_state, "sai-push-state"),
};
static void
saip_state_path(char *buf, size_t len, const char *suffix)
{
lws_snprintf(buf, len, "%s/sai-push-state.json%s",
saip.conf->repo_cache, suffix);
}
int
saip_state_load(void)
{
unsigned char buf[512];
lws_struct_args_t a;
struct lejp_ctx ctx;
int n, m = LEJP_CONTINUE, fd;
saip_state_t *st;
char path[512];
saip_state_path(path, sizeof(path), "");
fd = lws_open(path, O_RDONLY);
if (fd < 0) {
if (errno != ENOENT) {
lwsl_err("%s: can't open %s: %s\n", __func__, path,
strerror(errno));
return 1;
}
/* first run */
return 0;
}
memset(&a, 0, sizeof(a));
a.map_st[0] = lsm_saip_state_schema;
a.map_entries_st[0] = LWS_ARRAY_SIZE(lsm_saip_state_schema);
a.ac_block_size = 1024;
lws_struct_json_init_parse(&ctx, NULL, &a);
do {
n = (int)read(fd, buf, sizeof(buf));
if (n <= 0)
break;
m = lejp_parse(&ctx, buf, n);
} while (m == LEJP_CONTINUE);
close(fd);
lejp_destruct(&ctx);
if (m < 0 || !a.dest) {
/*
* Don't carry on without it: it's what stops us promoting an
* older event over a newer one
*/
lwsl_err("%s: %s is damaged ('%s'), remove it to start over\n",
__func__, path, lejp_error_to_string(m));
lwsac_free(&a.ac);
return 1;
}
st = (saip_state_t *)a.dest;
lws_start_foreach_dll(struct lws_dll2 *, p, st->entries.head) {
saip_state_entry_t *e = lws_container_of(p, saip_state_entry_t,
list);
saip_target_t *t = NULL;
lws_start_foreach_dll(struct lws_dll2 *, q,
saip.conf->watches.head) {
saip_watch_t *w = lws_container_of(q, saip_watch_t,
list);
if (!strcmp(w->fetchurl, e->fetchurl))
t = saip_target_get(w, e->branch);
} lws_end_foreach_dll(q);
if (!t)
/* not a watch we have any more, it'll be dropped */
continue;
t->promoted_received = e->received;
lws_strncpy(t->promoted_hash, e->hash,
sizeof(t->promoted_hash));
lws_strncpy(t->promoted_uuid, e->uuid,
sizeof(t->promoted_uuid));
lwsl_notice("%s: %s %s: last promoted %.12s, event %s\n",
__func__, e->fetchurl, e->branch, e->hash,
e->uuid);
} lws_end_foreach_dll(p);
lwsac_free(&a.ac);
return 0;
}
/*
* Written to a temp file and renamed over the old one, so there's always a
* whole state file, the old one or the new one
*/
void
saip_state_save(void)
{
char path[512], tmp[520];
lws_struct_serialize_t *js;
struct lwsac *ac = NULL;
saip_state_entry_t *e;
uint8_t buf[1024];
saip_state_t st;
int fd, r, bad = 0;
size_t w;
memset(&st, 0, sizeof(st));
lws_start_foreach_dll(struct lws_dll2 *, q, saip.conf->watches.head) {
saip_watch_t *wa = lws_container_of(q, saip_watch_t, list);
lws_start_foreach_dll(struct lws_dll2 *, p, wa->targets.head) {
saip_target_t *t = lws_container_of(p, saip_target_t,
list);
if (!t->promoted_received)
continue;
e = lwsac_use_zero(&ac, sizeof(*e), 1024);
if (!e)
goto bail;
lws_strncpy(e->fetchurl, wa->fetchurl,
sizeof(e->fetchurl));
lws_strncpy(e->branch, t->branch, sizeof(e->branch));
lws_strncpy(e->hash, t->promoted_hash,
sizeof(e->hash));
lws_strncpy(e->uuid, t->promoted_uuid,
sizeof(e->uuid));
e->received = t->promoted_received;
lws_dll2_add_tail(&e->list, &st.entries);
} lws_end_foreach_dll(p);
} lws_end_foreach_dll(q);
saip_state_path(path, sizeof(path), "");
saip_state_path(tmp, sizeof(tmp), ".tmp");
fd = lws_open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd < 0) {
lwsl_err("%s: can't create %s: %s\n", __func__, tmp,
strerror(errno));
goto bail;
}
js = lws_struct_json_serialize_create(lsm_saip_state_schema,
LWS_ARRAY_SIZE(lsm_saip_state_schema), 0, &st);
if (!js) {
close(fd);
goto bail_unlink;
}
do {
w = 0;
r = lws_struct_json_serialize(js, buf, sizeof(buf), &w);
if (r == LSJS_RESULT_ERROR ||
(w && write(fd, buf, w) != (ssize_t)w))
bad = 1;
} while (r == LSJS_RESULT_CONTINUE && !bad);
lws_struct_json_serialize_destroy(&js);
if (fsync(fd))
bad = 1;
if (close(fd))
bad = 1;
if (bad || rename(tmp, path)) {
lwsl_err("%s: failed writing %s\n", __func__, path);
goto bail_unlink;
}
lwsac_free(&ac);
return;
bail_unlink:
unlink(tmp);
bail:
lwsac_free(&ac);
}
|