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/*
CTDB client code
Copyright (C) Amitay Isaacs 2015
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 "replace.h"
#include "system/network.h"
#include "system/filesys.h"
#include <talloc.h>
#include <tevent.h>
#include <tdb.h>
#include "lib/util/tevent_unix.h"
#include "common/reqid.h"
#include "common/srvid.h"
#include "common/comm.h"
#include "protocol/protocol.h"
#include "protocol/protocol_api.h"
#include "client/client_private.h"
#include "client/client.h"
/*
* Handle REQ_CALL and REPLY_CALL
*/
struct ctdb_client_call_state {
struct ctdb_client_context *client;
uint32_t reqid;
struct ctdb_reply_call *reply;
struct tevent_req *req;
};
static int ctdb_client_call_state_destructor(
struct ctdb_client_call_state *state);
static void ctdb_client_call_done(struct tevent_req *subreq);
struct tevent_req *ctdb_client_call_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
struct ctdb_req_call *request)
{
struct ctdb_req_header h;
struct tevent_req *req, *subreq;
struct ctdb_client_call_state *state;
uint32_t reqid;
uint8_t *buf;
size_t datalen, buflen;
int ret;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_client_call_state);
if (req == NULL) {
return NULL;
}
reqid = reqid_new(client->idr, state);
if (reqid == REQID_INVALID) {
talloc_free(req);
return NULL;
}
state->client = client;
state->reqid = reqid;
state->req = req;
state->reply = talloc_zero(state, struct ctdb_reply_call);
if (tevent_req_nomem(state->reply, req)) {
return tevent_req_post(req, ev);
}
talloc_set_destructor(state, ctdb_client_call_state_destructor);
ctdb_req_header_fill(&h, 0, CTDB_REQ_CALL, CTDB_CURRENT_NODE,
client->pnn, reqid);
datalen = ctdb_req_call_len(&h, request);
ret = ctdb_allocate_pkt(state, datalen, &buf, &buflen);
if (ret != 0) {
tevent_req_error(req, ret);
return tevent_req_post(req, ev);
}
ret = ctdb_req_call_push(&h, request, buf, &buflen);
if (ret != 0) {
tevent_req_error(req, ret);
return tevent_req_post(req, ev);
}
subreq = comm_write_send(state, ev, client->comm, buf, buflen);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_client_call_done, req);
return req;
}
static int ctdb_client_call_state_destructor(
struct ctdb_client_call_state *state)
{
reqid_remove(state->client->idr, state->reqid);
return 0;
}
static void ctdb_client_call_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
bool status;
int ret;
status = comm_write_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
/* wait for the reply */
}
void ctdb_client_reply_call(struct ctdb_client_context *client,
uint8_t *buf, size_t buflen, uint32_t reqid)
{
struct ctdb_req_header h;
struct ctdb_client_call_state *state;
int ret;
state = reqid_find(client->idr, reqid, struct ctdb_client_call_state);
if (state == NULL) {
return;
}
if (reqid != state->reqid) {
return;
}
ret = ctdb_reply_call_pull(buf, buflen, &h, state, state->reply);
if (ret != 0) {
tevent_req_error(state->req, ret);
return;
}
tevent_req_done(state->req);
}
bool ctdb_client_call_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
struct ctdb_reply_call **reply, int *perr)
{
struct ctdb_client_call_state *state = tevent_req_data(
req, struct ctdb_client_call_state);
int err;
if (tevent_req_is_unix_error(req, &err)) {
if (perr != NULL) {
*perr = err;
}
return false;
}
if (reply != NULL) {
*reply = talloc_steal(mem_ctx, state->reply);
}
return true;
}
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