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gcache.c
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gcache.c
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/*
* OwnTracks Recorder
* Copyright (C) 2015-2024 Jan-Piet Mens <[email protected]>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "udata.h"
#include "fences.h"
#include "gcache.h"
#include "util.h"
/*
* dbname is an named LMDB database; may be NULL.
*/
struct gcache *gcache_open(char *path, char *dbname, int rdonly)
{
size_t lmdb_size = LMDB_DB_SIZE;
MDB_txn *txn = NULL;
int rc;
unsigned int flags = 0, dbiflags = 0, perms = 0664;
struct gcache *gc;
char *p;
if ((p = getenv("OTR_LMDBSIZE")) != NULL) {
lmdb_size = atol(p);
if (lmdb_size < 10485760) { // 10 MB
lmdb_size = 10485760;
}
}
if (!is_directory(path)) {
olog(LOG_ERR, "gcache_open: %s is not a directory", path);
return (NULL);
}
if ((gc = malloc(sizeof (struct gcache))) == NULL)
return (NULL);
memset(gc, 0, sizeof(struct gcache));
if (rdonly) {
flags |= MDB_RDONLY;
perms = 0444;
perms = 0664;
} else {
dbiflags = MDB_CREATE;
}
rc = mdb_env_create(&gc->env);
if (rc != 0) {
olog(LOG_ERR, "gcache_open: mdb_env_create: %s (for %lu bytes)", mdb_strerror(rc), lmdb_size);
free(gc);
return (NULL);
}
mdb_env_set_mapsize(gc->env, lmdb_size);
rc = mdb_env_set_maxdbs(gc->env, 10);
if (rc != 0) {
olog(LOG_ERR, "gcache_open: mdb_env_set_maxdbs%s", mdb_strerror(rc));
free(gc);
return (NULL);
}
rc = mdb_env_open(gc->env, path, flags, perms);
if (rc != 0) {
olog(LOG_ERR, "gcache_open: mdb_env_open: %s", mdb_strerror(rc));
free(gc);
return (NULL);
}
/* Open a pseudo TX so that we can open DBI */
mdb_txn_begin(gc->env, NULL, flags, &txn);
if (rc != 0) {
olog(LOG_ERR, "gcache_open: mdb_txn_begin: %s", mdb_strerror(rc));
mdb_env_close(gc->env);
free(gc);
return (NULL);
}
rc = mdb_dbi_open(txn, dbname, dbiflags, &gc->dbi);
if (rc != 0) {
olog(LOG_ERR, "gcache_open: mdb_dbi_open for `%s': %s", dbname, mdb_strerror(rc));
mdb_txn_abort(txn);
mdb_env_close(gc->env);
free(gc);
return (NULL);
}
rc = mdb_txn_commit(txn);
if (rc != 0) {
olog(LOG_ERR, "cogcache_open: commit after open %s", mdb_strerror(rc));
mdb_env_close(gc->env);
free(gc);
return (NULL);
}
return (gc);
}
void gcache_close(struct gcache *gc)
{
if (gc == NULL)
return;
mdb_env_close(gc->env);
free(gc);
}
int gcache_del(struct gcache *gc, char *keystr)
{
int rc;
MDB_val key;
MDB_txn *txn;
rc = mdb_txn_begin(gc->env, NULL, 0, &txn);
if (rc != 0) {
olog(LOG_ERR, "gcache_del: mdb_txn_begin: %s", mdb_strerror(rc));
return (rc);
}
key.mv_data = keystr;
key.mv_size = strlen(keystr);
rc = mdb_del(txn, gc->dbi, &key, NULL);
if (rc != 0 && rc != MDB_NOTFOUND) {
olog(LOG_ERR, "gcache_del: mdb_del: %s", mdb_strerror(rc));
/* fall through to commit */
}
rc = mdb_txn_commit(txn);
if (rc) {
olog(LOG_ERR, "gcache_del: mdb_txn_commit: (%d) %s", rc, mdb_strerror(rc));
mdb_txn_abort(txn);
}
return (rc);
}
int gcache_put(struct gcache *gc, char *keystr, char *payload)
{
int rc;
MDB_val key, data;
MDB_txn *txn;
if (gc == NULL)
return (1);
if (strcmp(payload, "DELETE") == 0)
return gcache_del(gc, keystr);
rc = mdb_txn_begin(gc->env, NULL, 0, &txn);
if (rc != 0) {
olog(LOG_ERR, "gcache_put: mdb_txn_begin: %s", mdb_strerror(rc));
return (rc);
}
key.mv_data = keystr;
key.mv_size = strlen(keystr);
data.mv_data = payload;
data.mv_size = strlen(payload) + 1; /* including nul-byte so we can
* later decode string directly
* from this buffer */
rc = mdb_put(txn, gc->dbi, &key, &data, 0);
if (rc != 0) {
olog(LOG_ERR, "gcache_put: mdb_put: %s", mdb_strerror(rc));
/* fall through to commit */
}
rc = mdb_txn_commit(txn);
if (rc) {
olog(LOG_ERR, "gcache_put: mdb_txn_commit: (%d) %s", rc, mdb_strerror(rc));
mdb_txn_abort(txn);
}
return (rc);
}
int gcache_json_put(struct gcache *gc, char *keystr, JsonNode *json)
{
int rc;
char *js;
if (gc == NULL)
return (1);
if ((js = json_stringify(json, NULL)) == NULL) {
olog(LOG_ERR, "gcache_json_put: CAN'T stringify JSON");
return (1);
}
rc = gcache_put(gc, keystr, js);
free(js);
return (rc);
}
long gcache_get(struct gcache *gc, char *k, char *buf, long buflen)
{
MDB_val key, data;
MDB_txn *txn;
int rc;
long len = -1;
if (gc == NULL)
return (-1);
rc = mdb_txn_begin(gc->env, NULL, MDB_RDONLY, &txn);
if (rc) {
olog(LOG_ERR, "gcache_get: mdb_txn_begin: (%d) %s", rc, mdb_strerror(rc));
return (-1);
}
key.mv_data = k;
key.mv_size = strlen(k);
rc = mdb_get(txn, gc->dbi, &key, &data);
if (rc != 0) {
if (rc != MDB_NOTFOUND) {
printf("get: %s\n", mdb_strerror(rc));
} else {
// printf(" [%s] not found\n", k);
}
} else {
len = (data.mv_size < buflen) ? data.mv_size : buflen;
memcpy(buf, data.mv_data, len);
// printf("%s\n", (char *)data.mv_data);
}
mdb_txn_commit(txn);
return (len);
}
/*
* Attempt to get key `k` from LMDB. If found, decode the JSON string in it and
* return a JSON object, else NULL.
*/
JsonNode *gcache_json_get(struct gcache *gc, char *k)
{
MDB_val key, data;
MDB_txn *txn;
int rc;
JsonNode *json = NULL;
if (gc == NULL)
return (NULL);
rc = mdb_txn_begin(gc->env, NULL, MDB_RDONLY, &txn);
if (rc) {
olog(LOG_ERR, "gcache_json_get: mdb_txn_begin: (%d) %s", rc, mdb_strerror(rc));
return (NULL);
}
key.mv_data = k;
key.mv_size = strlen(k);
rc = mdb_get(txn, gc->dbi, &key, &data);
if (rc != 0) {
if (rc != MDB_NOTFOUND) {
olog(LOG_ERR, "gcache_json_get(%s): %s", k, mdb_strerror(rc));
} else {
// printf(" [%s] not found\n", k);
json = NULL;
}
} else {
// printf("%s\n", (char *)data.mv_data);
if ((json = json_decode((char *)data.mv_data)) == NULL) {
olog(LOG_ERR, "gcache_json_get: Cannot decode JSON from lmdb");
}
}
mdb_txn_commit(txn);
return (json);
}
void gcache_dump(char *path, char *lmdbname)
{
struct gcache *gc;
MDB_val key, data;
MDB_txn *txn;
MDB_cursor *cursor;
int rc;
if ((gc = gcache_open(path, lmdbname, TRUE)) == NULL) {
fprintf(stderr, "Cannot open lmdb/%s at %s\n",
lmdbname ? lmdbname : "NULL", path);
return;
}
key.mv_size = 0;
key.mv_data = NULL;
rc = mdb_txn_begin(gc->env, NULL, MDB_RDONLY, &txn);
if (rc) {
olog(LOG_ERR, "gcache_dump: mdb_txn_begin: (%d) %s", rc, mdb_strerror(rc));
gcache_close(gc);
return;
}
rc = mdb_cursor_open(txn, gc->dbi, &cursor);
/* -1 because we 0-terminate strings in values */
while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
printf("%*.*s %*.*s\n",
(int)key.mv_size, (int)key.mv_size, (char *)key.mv_data,
(int)data.mv_size - 1, (int)data.mv_size - 1, (char *)data.mv_data);
}
mdb_cursor_close(cursor);
mdb_txn_commit(txn);
gcache_close(gc);
}
void gcache_load(char *path, char *lmdbname)
{
struct gcache *gc;
char buf[8192], *bp;
int rc;
if ((gc = gcache_open(path, lmdbname, FALSE)) == NULL) {
olog(LOG_ERR, "gcache_load: gcache_open");
return;
}
while (fgets(buf, sizeof(buf), stdin) != NULL) {
if ((bp = strchr(buf, '\r')) != NULL)
*bp = 0;
if ((bp = strchr(buf, '\n')) != NULL)
*bp = 0;
if ((bp = strchr(buf, ' ')) != NULL) {
*bp = 0;
if ((rc = gcache_put(gc, buf, bp+1)) != 0) {
fprintf(stderr, "Cannot load key; aborting load (%d) %s\n",
rc, mdb_strerror(rc));
olog(LOG_ERR, "gcache_put: (%d) %s", rc, mdb_strerror(rc));
goto end;
}
}
}
end:
gcache_close(gc);
}
/*
* Enumerate (list) keys in lmdb `gc` and invoke func() on each. If func() returns true
* update the data.
*/
bool gcache_enum(char *user, char *device, struct gcache *gc, char *key_part, int (*func)(char *key, wpoint *wp, double lat, double lon), double lat, double lon, struct udata *ud, char *topic, JsonNode *jsonpayload)
{
MDB_val key, data;
MDB_txn *txn;
MDB_cursor *cursor;
int rc, op;
static UT_string *ks; /* key string */
wpoint wp;
if (gc == NULL)
return (NULL);
rc = mdb_txn_begin(gc->env, NULL, MDB_RDONLY, &txn);
if (rc) {
olog(LOG_ERR, "gcache_enum: mdb_txn_begin: (%d) %s", rc, mdb_strerror(rc));
return (NULL);
}
key.mv_data = key_part;
key.mv_size = strlen(key_part);
rc = mdb_cursor_open(txn, gc->dbi, &cursor);
op = MDB_SET_RANGE;
do {
JsonNode *json, *jlat, *jlon, *jrad, *jio, *jdesc;
size_t len;
rc = mdb_cursor_get(cursor, &key, &data, op);
if (rc != 0)
break;
len = (strlen(key_part) < key.mv_size) ? strlen(key_part) : key.mv_size;
if (memcmp(key_part, key.mv_data, len) != 0) {
break;
}
/* -1 because we 0-terminate strings */
//printf("ENUM---- %*.*s %*.*s\n",
// (int)key.mv_size, (int)key.mv_size, (char *)key.mv_data,
// (int)data.mv_size - 1, (int)data.mv_size - 1, (char *)data.mv_data);
utstring_renew(ks);
utstring_printf(ks, "%*.*s",
(int)key.mv_size, (int)key.mv_size, (char *)key.mv_data);
if ((json = json_decode(data.mv_data)) == NULL)
continue;
if ((jlat = json_find_member(json, "lat")) == NULL) continue;
if ((jlon = json_find_member(json, "lon")) == NULL) continue;
if ((jrad = json_find_member(json, "rad")) == NULL) continue;
if ((jdesc = json_find_member(json, "desc")) == NULL) continue;
if ((jio = json_find_member(json, "io")) == NULL) {
json_append_member(json, "io", json_mkbool(false));
jio = json_find_member(json, "io");
}
wp.lat = jlat->number_;
wp.lon = jlon->number_;
wp.rad = (long)jrad->number_;
wp.io = jio->bool_;
wp.desc = strdup(jdesc->string_);
wp.ud = ud;
wp.user = user;
wp.device = device;
wp.topic = topic;
wp.json = jsonpayload;
if (func && func(UB(ks), &wp, lat, lon) == true) {
json_delete(jio);
json_append_member(json, "io", json_mkbool(wp.io));
if (gcache_json_put(gc, UB(ks), json) != 0) {
olog(LOG_ERR, "gcache_enum: cannot rewrite key %s", UB(ks));
}
}
free(wp.desc);
json_delete(json);
op = MDB_NEXT;
} while (rc == 0);
mdb_cursor_close(cursor);
mdb_txn_commit(txn);
return (true);
}