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samba-mirror/ctdb/client/client_message.c
Amitay Isaacs 1469cfb0be ctdb-client: Create sync wrappers for managing message handlers
This wraps the entire async computation for setting and removing message
handlers instead of calling multiple sync calls.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
2017-06-07 16:05:26 +02:00

608 lines
13 KiB
C

/*
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_MESSAGE
*/
struct ctdb_client_message_state {
struct ctdb_client_context *client;
uint32_t reqid;
};
static int ctdb_client_message_state_destructor(
struct ctdb_client_message_state *state);
static void ctdb_client_message_done(struct tevent_req *subreq);
struct tevent_req *ctdb_client_message_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint32_t destnode,
struct ctdb_req_message *message)
{
struct tevent_req *req, *subreq;
struct ctdb_client_message_state *state;
struct ctdb_req_header h;
uint32_t reqid;
uint8_t *buf;
size_t datalen, buflen;
int ret;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_client_message_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;
talloc_set_destructor(state, ctdb_client_message_state_destructor);
ctdb_req_header_fill(&h, 0, CTDB_REQ_MESSAGE, destnode,
client->pnn, reqid);
datalen = ctdb_req_message_len(&h, message);
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_message_push(&h, message, 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_message_done, req);
return req;
}
static int ctdb_client_message_state_destructor(
struct ctdb_client_message_state *state)
{
reqid_remove(state->client->idr, state->reqid);
return 0;
}
static void ctdb_client_message_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
int ret;
bool status;
status = comm_write_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
bool ctdb_client_message_recv(struct tevent_req *req, int *perr)
{
int err;
if (tevent_req_is_unix_error(req, &err)) {
if (perr != NULL) {
*perr = err;
}
return false;
}
return true;
}
void ctdb_client_req_message(struct ctdb_client_context *client,
uint8_t *buf, size_t buflen, uint32_t reqid)
{
struct ctdb_req_header h;
struct ctdb_req_message_data message;
TALLOC_CTX *tmp_ctx = talloc_new(client);
int ret;
ret = ctdb_req_message_data_pull(buf, buflen, &h, tmp_ctx, &message);
if (ret != 0) {
return;
}
srvid_dispatch(client->srv, message.srvid, CTDB_SRVID_ALL,
message.data);
talloc_free(tmp_ctx);
}
/*
* Handle multiple nodes
*/
struct ctdb_client_message_multi_state {
uint32_t *pnn_list;
int count;
int done;
int err;
int *err_list;
};
struct message_index_state {
struct tevent_req *req;
int index;
};
static void ctdb_client_message_multi_done(struct tevent_req *subreq);
struct tevent_req *ctdb_client_message_multi_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint32_t *pnn_list, int count,
struct ctdb_req_message *message)
{
struct tevent_req *req, *subreq;
struct ctdb_client_message_multi_state *state;
int i;
if (pnn_list == NULL || count == 0) {
return NULL;
}
req = tevent_req_create(mem_ctx, &state,
struct ctdb_client_message_multi_state);
if (req == NULL) {
return NULL;
}
state->pnn_list = pnn_list;
state->count = count;
state->done = 0;
state->err = 0;
state->err_list = talloc_zero_array(state, int, count);
if (tevent_req_nomem(state->err_list, req)) {
return tevent_req_post(req, ev);
}
for (i=0; i<count; i++) {
struct message_index_state *substate;
subreq = ctdb_client_message_send(state, ev, client,
pnn_list[i], message);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
substate = talloc(subreq, struct message_index_state);
if (tevent_req_nomem(substate, req)) {
return tevent_req_post(req, ev);
}
substate->req = req;
substate->index = i;
tevent_req_set_callback(subreq, ctdb_client_message_multi_done,
substate);
}
return req;
}
static void ctdb_client_message_multi_done(struct tevent_req *subreq)
{
struct message_index_state *substate = tevent_req_callback_data(
subreq, struct message_index_state);
struct tevent_req *req = substate->req;
int idx = substate->index;
struct ctdb_client_message_multi_state *state = tevent_req_data(
req, struct ctdb_client_message_multi_state);
bool status;
int ret;
status = ctdb_client_message_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
if (state->err == 0) {
state->err = ret;
state->err_list[idx] = state->err;
}
}
state->done += 1;
if (state->done == state->count) {
tevent_req_done(req);
}
}
bool ctdb_client_message_multi_recv(struct tevent_req *req, int *perr,
TALLOC_CTX *mem_ctx, int **perr_list)
{
struct ctdb_client_message_multi_state *state = tevent_req_data(
req, struct ctdb_client_message_multi_state);
int err;
if (tevent_req_is_unix_error(req, &err)) {
if (perr != NULL) {
*perr = err;
}
if (perr_list != NULL) {
*perr_list = talloc_steal(mem_ctx, state->err_list);
}
return false;
}
if (perr != NULL) {
*perr = state->err;
}
if (perr_list != NULL) {
*perr_list = talloc_steal(mem_ctx, state->err_list);
}
if (state->err != 0) {
return false;
}
return true;
}
/*
* sync version of message send
*/
int ctdb_client_message(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_client_context *client,
uint32_t destnode, struct ctdb_req_message *message)
{
TALLOC_CTX *tmp_ctx;
struct tevent_req *req;
int ret;
bool status;
tmp_ctx = talloc_new(client);
if (tmp_ctx == NULL) {
return ENOMEM;
}
req = ctdb_client_message_send(tmp_ctx, ev, client, destnode, message);
if (req == NULL) {
talloc_free(tmp_ctx);
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_client_message_recv(req, &ret);
if (! status) {
talloc_free(tmp_ctx);
return ret;
}
talloc_free(tmp_ctx);
return 0;
}
int ctdb_client_message_multi(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint32_t *pnn_list, int count,
struct ctdb_req_message *message,
int **perr_list)
{
struct tevent_req *req;
bool status;
int ret;
req = ctdb_client_message_multi_send(mem_ctx, ev, client,
pnn_list, count,
message);
if (req == NULL) {
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_client_message_multi_recv(req, &ret, mem_ctx, perr_list);
if (! status) {
return ret;
}
return 0;
}
struct ctdb_client_set_message_handler_state {
struct ctdb_client_context *client;
uint64_t srvid;
srvid_handler_fn handler;
void *private_data;
};
static void ctdb_client_set_message_handler_done(struct tevent_req *subreq);
struct tevent_req *ctdb_client_set_message_handler_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint64_t srvid,
srvid_handler_fn handler,
void *private_data)
{
struct tevent_req *req, *subreq;
struct ctdb_client_set_message_handler_state *state;
struct ctdb_req_control request;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_client_set_message_handler_state);
if (req == NULL) {
return NULL;
}
state->client = client;
state->srvid = srvid;
state->handler = handler;
state->private_data = private_data;
ctdb_req_control_register_srvid(&request, srvid);
subreq = ctdb_client_control_send(state, ev, client, client->pnn,
tevent_timeval_zero(), &request);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_client_set_message_handler_done,
req);
return req;
}
static void ctdb_client_set_message_handler_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct ctdb_client_set_message_handler_state *state = tevent_req_data(
req, struct ctdb_client_set_message_handler_state);
struct ctdb_reply_control *reply;
bool status;
int ret;
status = ctdb_client_control_recv(subreq, &ret, state, &reply);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
ret = ctdb_reply_control_register_srvid(reply);
talloc_free(reply);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
ret = srvid_register(state->client->srv, state->client, state->srvid,
state->handler, state->private_data);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
bool ctdb_client_set_message_handler_recv(struct tevent_req *req, int *perr)
{
int err;
if (tevent_req_is_unix_error(req, &err)) {
if (perr != NULL) {
*perr = err;
}
return false;
}
return true;
}
struct ctdb_client_remove_message_handler_state {
struct ctdb_client_context *client;
uint64_t srvid;
void *private_data;
};
static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq);
struct tevent_req *ctdb_client_remove_message_handler_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint64_t srvid,
void *private_data)
{
struct tevent_req *req, *subreq;
struct ctdb_client_remove_message_handler_state *state;
struct ctdb_req_control request;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_client_remove_message_handler_state);
if (req == NULL) {
return NULL;
}
state->client = client;
state->srvid = srvid;
state->private_data = private_data;
ctdb_req_control_deregister_srvid(&request, srvid);
subreq = ctdb_client_control_send(state, ev, client, client->pnn,
tevent_timeval_zero(), &request);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq,
ctdb_client_remove_message_handler_done, req);
return req;
}
static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct ctdb_client_remove_message_handler_state *state = tevent_req_data(
req, struct ctdb_client_remove_message_handler_state);
struct ctdb_reply_control *reply;
bool status;
int ret;
status = ctdb_client_control_recv(subreq, &ret, state, &reply);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
ret = ctdb_reply_control_deregister_srvid(reply);
talloc_free(reply);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
ret = srvid_deregister(state->client->srv, state->srvid,
state->private_data);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
bool ctdb_client_remove_message_handler_recv(struct tevent_req *req, int *perr)
{
int err;
if (tevent_req_is_unix_error(req, &err)) {
if (perr != NULL) {
*perr = err;
}
return false;
}
return true;
}
int ctdb_client_set_message_handler(struct tevent_context *ev,
struct ctdb_client_context *client,
uint64_t srvid, srvid_handler_fn handler,
void *private_data)
{
TALLOC_CTX *mem_ctx;
struct tevent_req *req;
int ret;
bool status;
mem_ctx = talloc_new(client);
if (mem_ctx == NULL) {
return ENOMEM;
}
req = ctdb_client_set_message_handler_send(mem_ctx, ev, client,
srvid, handler,
private_data);
if (req == NULL) {
talloc_free(mem_ctx);
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_client_set_message_handler_recv(req, &ret);
if (! status) {
talloc_free(mem_ctx);
return ret;
}
talloc_free(mem_ctx);
return 0;
}
int ctdb_client_remove_message_handler(struct tevent_context *ev,
struct ctdb_client_context *client,
uint64_t srvid, void *private_data)
{
TALLOC_CTX *mem_ctx;
struct tevent_req *req;
int ret;
bool status;
mem_ctx = talloc_new(client);
if (mem_ctx == NULL) {
return ENOMEM;
}
req = ctdb_client_remove_message_handler_send(mem_ctx, ev, client,
srvid, private_data);
if (req == NULL) {
talloc_free(mem_ctx);
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_client_remove_message_handler_recv(req, &ret);
if (! status) {
talloc_free(mem_ctx);
return ret;
}
talloc_free(mem_ctx);
return 0;
}