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/*
SSSD
System Database
Copyright (C) Simo Sorce <ssorce@redhat.com> 2009
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 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <time.h>
#include "util/util.h"
#include "util/dlinklist.h"
#include "db/sysdb_private.h"
#include "ldb.h"
struct sysdb_req {
struct sysdb_req *next, *prev;
struct sysdb_ctx *ctx;
sysdb_req_fn_t fn;
void *pvt;
int status;
bool transaction_active;
};
static void sysdb_req_run(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval tv, void *ptr)
{
struct sysdb_req *req = talloc_get_type(ptr, struct sysdb_req);
if (req != req->ctx->queue) abort();
req->fn(req, req->pvt);
}
static int sysdb_req_schedule(struct sysdb_req *req)
{
struct tevent_timer *te = NULL;
struct timeval tv;
/* call it asap */
tv.tv_sec = 0;
tv.tv_usec = 0;
te = tevent_add_timer(req->ctx->ev, req, tv, sysdb_req_run, req);
if (te == NULL) {
return EIO;
}
return EOK;
}
static int sysdb_req_enqueue(struct sysdb_req *req)
{
int ret = EOK;
DLIST_ADD_END(req->ctx->queue, req, struct sysdb_req *);
if (req->ctx->queue == req) {
ret = sysdb_req_schedule(req);
}
return ret;
}
static void sysdb_transaction_end(struct sysdb_req *req);
static int sysdb_req_destructor(void *ptr)
{
struct sysdb_req *req;
int ret;
req = talloc_get_type(ptr, struct sysdb_req);
if (req->ctx->queue != req) {
DLIST_REMOVE(req->ctx->queue, req);
return 0;
}
/* req is the currently running operation or
* scheduled to run operation */
if (req->transaction_active) {
/* freeing before the transaction is complete */
req->status = ETIMEDOUT;
sysdb_transaction_end(req);
}
DLIST_REMOVE(req->ctx->queue, req);
/* make sure we schedule the next in line if any */
if (req->ctx->queue) {
ret = sysdb_req_schedule(req->ctx->queue);
if (ret != EOK) abort();
}
return 0;
}
static struct sysdb_req *sysdb_new_req(TALLOC_CTX *memctx,
struct sysdb_ctx *ctx,
sysdb_req_fn_t fn, void *pvt)
{
struct sysdb_req *req;
req = talloc_zero(memctx, struct sysdb_req);
if (!req) return NULL;
req->ctx = ctx;
req->fn = fn;
req->pvt = pvt;
talloc_set_destructor((TALLOC_CTX *)req, sysdb_req_destructor);
return req;
}
static void sysdb_transaction_int(struct sysdb_req *intreq, void *pvt)
{
struct sysdb_req *req = talloc_get_type(pvt, struct sysdb_req);
int ret;
/* first of all swap this internal request with the real one on the queue
* otherwise request_done() will later abort */
DLIST_REMOVE(req->ctx->queue, intreq);
DLIST_ADD(req->ctx->queue, req);
if (intreq->status != EOK) {
req->status = intreq->status;
req->fn(req, req->pvt);
return;
}
ret = ldb_transaction_start(req->ctx->ldb);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("Failed to start ldb transaction! (%d)\n", ret));
req->status = sysdb_error_to_errno(ret);
}
req->transaction_active = true;
req->fn(req, req->pvt);
}
static void sysdb_transaction_end(struct sysdb_req *req)
{
int ret;
if (req->status == EOK) {
ret = ldb_transaction_commit(req->ctx->ldb);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("Failed to commit ldb transaction! (%d)\n", ret));
}
} else {
DEBUG(4, ("Canceling transaction (%d[%s)\n",
req->status, strerror(req->status)));
ret = ldb_transaction_cancel(req->ctx->ldb);
if (ret != LDB_SUCCESS) {
DEBUG(1, ("Failed to cancel ldb transaction! (%d)\n", ret));
/* FIXME: abort() ? */
}
}
req->transaction_active = false;
}
int sysdb_transaction(TALLOC_CTX *memctx, struct sysdb_ctx *ctx,
sysdb_req_fn_t fn, void *pvt)
{
struct sysdb_req *req, *intreq;
req = sysdb_new_req(memctx, ctx, fn, pvt);
if (!req) return ENOMEM;
intreq = sysdb_new_req(req, ctx, sysdb_transaction_int, req);
if (!intreq) {
talloc_free(intreq);
return ENOMEM;
}
return sysdb_req_enqueue(intreq);
}
void sysdb_transaction_done(struct sysdb_req *req, int status)
{
int ret;
if (req->ctx->queue != req) abort();
if (!req->transaction_active) abort();
req->status = status;
sysdb_transaction_end(req);
DLIST_REMOVE(req->ctx->queue, req);
if (req->ctx->queue) {
ret = sysdb_req_schedule(req->ctx->queue);
if (ret != EOK) abort();
}
talloc_free(req);
}
int sysdb_operation(TALLOC_CTX *memctx, struct sysdb_ctx *ctx,
sysdb_req_fn_t fn, void *pvt)
{
struct sysdb_req *req;
req = sysdb_new_req(memctx, ctx, fn, pvt);
if (!req) return ENOMEM;
return sysdb_req_enqueue(req);
}
void sysdb_operation_done(struct sysdb_req *req)
{
int ret;
if (req->ctx->queue != req) abort();
DLIST_REMOVE(req->ctx->queue, req);
if (req->ctx->queue) {
ret = sysdb_req_schedule(req->ctx->queue);
if (ret != EOK) abort();
}
talloc_free(req);
}
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