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/*
* nanobbs, a tiny forums software.
* Copyright (C) 2025-2026 Xavier Del Campo Romero
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "op.h"
#include <libweb/http.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
struct op
{
sqlite3_stmt *stmt;
struct op_cfg cfg;
};
static int teardown(struct op *const op)
{
int ret = 0, error;
if (!op)
return 0;
else if ((error = sqlite3_finalize(op->stmt)) != SQLITE_OK)
{
fprintf(stderr, "%s: sqlite3_finalize: %s\n", __func__,
sqlite3_errstr(error));
ret = -1;
}
const struct op_cfg *const cfg = &op->cfg;
if (cfg->error)
cfg->error(cfg->args);
free(op);
return ret;
}
static void run_error(void *const p)
{
teardown(p);
}
static int run(const struct http_payload *const pl,
struct http_response *const r, void *const user, void *const args)
{
struct op *const op = args;
sqlite3_stmt *const stmt = op->stmt;
const struct op_cfg *const cfg = &op->cfg;
int ret = -1, error = sqlite3_step(stmt);
switch (error)
{
case SQLITE_BUSY:
break;
case SQLITE_ROW:
if (!cfg->row)
{
fprintf(stderr, "%s: expected row callback\n", __func__);
goto failure;
}
else if ((ret = cfg->row(op->stmt, pl, r, user, cfg->args)))
goto failure;
break;
case SQLITE_CONSTRAINT:
sqlite3_reset(op->stmt);
if (!cfg->constraint)
{
fprintf(stderr, "%s: expected constraint callback\n", __func__);
goto failure;
}
else if ((ret = cfg->constraint(cfg->args)))
goto failure;
/* Fall through. */
case SQLITE_DONE:
{
const int error = sqlite3_finalize(op->stmt);
if (error != SQLITE_OK)
{
fprintf(stderr, "%s: sqlite3_finalize: %s\n", __func__,
sqlite3_errstr(error));
ret = -1;
goto failure;
}
else if (cfg->end && (ret = cfg->end(pl, r, user, cfg->args)))
goto failure;
free(op);
}
break;
default:
fprintf(stderr, "%s: sqlite3_step: %s\n", __func__,
sqlite3_errstr(error));
sqlite3_reset(stmt);
goto failure;
}
return 0;
failure:
if (teardown(op))
{
fprintf(stderr, "%s: teardown failed\n", __func__);
ret = -1;
}
return ret;
}
void op_resume(struct op *const op, struct http_response *const r)
{
*r = (const struct http_response)
{
.step.payload = run,
.free = run_error,
.args = op
};
}
struct op *op_run(sqlite3 *const db, const char *const query,
const struct op_cfg *const cfg, struct http_response *const r)
{
sqlite3_stmt *stmt = NULL;
struct op *const ret = malloc(sizeof *ret);
if (!ret)
{
fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
goto failure;
}
const int error = sqlite3_prepare_v2(db, query, -1, &stmt, NULL);
if (error != SQLITE_OK && error != SQLITE_BUSY)
{
fprintf(stderr, "%s: sqlite3_prepare_v2 \"%s\": %s\n", __func__,
query, sqlite3_errstr(error));
goto failure;
}
*r = (const struct http_response)
{
.step.payload = run,
.free = run_error,
.args = ret
};
*ret = (const struct op)
{
.stmt = stmt,
.cfg = *cfg
};
return ret;
failure:
free(ret);
sqlite3_finalize(stmt);
return NULL;
}
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