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