95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* $Id$ */
|
|
/*
|
|
* 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:
|
|
// TODO open readonly
|
|
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 = db;
|
|
return(1);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* 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(r->arg));
|
|
}
|