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Utils

This commit is contained in:
Meutel 2016-12-18 16:50:56 +01:00
parent 6da149e905
commit 545b231692
3 changed files with 162 additions and 0 deletions
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92
db.c Normal file
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/* $Id$ */
/*
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <kcgi.h>
#include <kcgijson.h>
#include <sqlite3.h>
#include "extern.h"
/*
* When the database is busy or locked, sleep for a random amount of
* time before continuing.
* We could put all sorts of heuristics in here to back off, but we do
* something really simple.
*/
static void
db_sleep(size_t attempt)
{
if (attempt < 10)
usleep(arc4random_uniform(100000));
else
usleep(arc4random_uniform(500000));
}
/*
* Open the database and stash the resulting handle in the kreq
*/
int
db_open(struct kreq *r, const char *file)
{
size_t attempt;
sqlite3 *db;
int rc;
attempt = 0;
// TODO max attempt, return 0
again:
rc = sqlite3_open(file, &db);
if (SQLITE_BUSY == rc) {
db_sleep(attempt++);
goto again;
} else if (SQLITE_LOCKED == rc) {
fprintf(stderr, "sqlite3_open: %s\n",
sqlite3_errmsg(db));
db_sleep(attempt++);
goto again;
} else if (SQLITE_PROTOCOL == rc) {
fprintf(stderr, "sqlite3_open: %s\n",
sqlite3_errmsg(db));
db_sleep(attempt++);
goto again;
} else if (SQLITE_OK == rc) {
sqlite3_busy_timeout(db, 500);
r->arg = sql;
return(1);
}
}
/*
* Close the database stashed in the kreq's argument.
*/
void
db_close(struct kreq *r)
{
if (SQLITE_OK == sqlite3_close(r->arg)) {
r->arg = NULL;
return;
}
fprintf(stderr, "sqlite3_close: %s\n", sqlite3_errmsg(db));
}

29
extern.h Normal file
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/* $Id$ */
/*
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef EXTERN_H
#define EXTERN_H
__BEGIN_DECLS
void db_close(struct kreq *);
int db_open(struct kreq *, const char *);
void json_emptydoc(struct kreq *);
__END_DECLS
#endif

41
json.c Normal file
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/* $Id$ */
/*
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <kcgi.h>
#include <kcgijson.h>
#include "extern.h"
/*
* Emit an empty JSON document.
*/
void
json_emptydoc(struct kreq *r)
{
struct kjsonreq req;
kjson_open(&req, r);
kjson_obj_open(&req);
kjson_obj_close(&req);
kjson_close(&req);
}