mirror of
https://github.com/samba-team/samba.git
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3da13a886d
Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net>
586 lines
13 KiB
C
586 lines
13 KiB
C
/*
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CTDB client code
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Copyright (C) Amitay Isaacs 2015
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/network.h"
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#include "system/filesys.h"
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#include <talloc.h>
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#include <tevent.h>
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#include <tdb.h>
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#include "lib/util/tevent_unix.h"
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#include "common/reqid.h"
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#include "common/srvid.h"
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#include "common/comm.h"
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#include "protocol/protocol.h"
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#include "protocol/protocol_api.h"
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#include "client/client_private.h"
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#include "client/client.h"
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/*
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* Handle REQ_MESSAGE
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*/
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struct ctdb_client_message_state {
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struct ctdb_client_context *client;
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uint32_t reqid;
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};
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static int ctdb_client_message_state_destructor(
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struct ctdb_client_message_state *state);
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static void ctdb_client_message_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_client_message_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint32_t destnode,
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struct ctdb_req_message *message)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_client_message_state *state;
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struct ctdb_req_header h;
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uint32_t reqid;
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uint8_t *buf;
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size_t datalen, buflen;
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int ret;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_client_message_state);
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if (req == NULL) {
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return NULL;
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}
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reqid = reqid_new(client->idr, state);
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if (reqid == REQID_INVALID) {
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talloc_free(req);
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return NULL;
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}
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state->client = client;
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state->reqid = reqid;
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talloc_set_destructor(state, ctdb_client_message_state_destructor);
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ctdb_req_header_fill(&h, 0, CTDB_REQ_MESSAGE, destnode,
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client->pnn, reqid);
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datalen = ctdb_req_message_len(&h, message);
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ret = ctdb_allocate_pkt(state, datalen, &buf, &buflen);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return tevent_req_post(req, ev);
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}
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ret = ctdb_req_message_push(&h, message, buf, &buflen);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return tevent_req_post(req, ev);
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}
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subreq = comm_write_send(state, ev, client->comm, buf, buflen);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, ctdb_client_message_done, req);
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return req;
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}
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static int ctdb_client_message_state_destructor(
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struct ctdb_client_message_state *state)
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{
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reqid_remove(state->client->idr, state->reqid);
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return 0;
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}
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static void ctdb_client_message_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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int ret;
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bool status;
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status = comm_write_recv(subreq, &ret);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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tevent_req_done(req);
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}
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bool ctdb_client_message_recv(struct tevent_req *req, int *perr)
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{
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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if (perr != NULL) {
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*perr = err;
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}
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return false;
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}
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return true;
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}
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void ctdb_client_req_message(struct ctdb_client_context *client,
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uint8_t *buf, size_t buflen, uint32_t reqid)
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{
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struct ctdb_req_header h;
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struct ctdb_req_message_data message;
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TALLOC_CTX *tmp_ctx = talloc_new(client);
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int ret;
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ret = ctdb_req_message_data_pull(buf, buflen, &h, tmp_ctx, &message);
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if (ret != 0) {
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return;
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}
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srvid_dispatch(client->srv, message.srvid, CTDB_SRVID_ALL,
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message.data);
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talloc_free(tmp_ctx);
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}
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/*
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* Handle multiple nodes
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*/
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struct ctdb_client_message_multi_state {
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uint32_t *pnn_list;
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int count;
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int done;
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int err;
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int *err_list;
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};
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struct message_index_state {
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struct tevent_req *req;
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int index;
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};
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static void ctdb_client_message_multi_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_client_message_multi_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint32_t *pnn_list, int count,
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struct ctdb_req_message *message)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_client_message_multi_state *state;
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int i;
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if (pnn_list == NULL || count == 0) {
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return NULL;
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}
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_client_message_multi_state);
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if (req == NULL) {
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return NULL;
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}
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state->pnn_list = pnn_list;
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state->count = count;
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state->done = 0;
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state->err = 0;
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state->err_list = talloc_zero_array(state, int, count);
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if (tevent_req_nomem(state->err_list, req)) {
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return tevent_req_post(req, ev);
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}
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for (i=0; i<count; i++) {
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struct message_index_state *substate;
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subreq = ctdb_client_message_send(state, ev, client,
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pnn_list[i], message);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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substate = talloc(subreq, struct message_index_state);
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if (tevent_req_nomem(substate, req)) {
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return tevent_req_post(req, ev);
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}
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substate->req = req;
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substate->index = i;
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tevent_req_set_callback(subreq, ctdb_client_message_multi_done,
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substate);
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}
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return req;
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}
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static void ctdb_client_message_multi_done(struct tevent_req *subreq)
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{
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struct message_index_state *substate = tevent_req_callback_data(
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subreq, struct message_index_state);
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struct tevent_req *req = substate->req;
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int idx = substate->index;
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struct ctdb_client_message_multi_state *state = tevent_req_data(
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req, struct ctdb_client_message_multi_state);
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bool status;
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int ret;
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status = ctdb_client_message_recv(subreq, &ret);
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TALLOC_FREE(subreq);
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if (! status) {
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if (state->err == 0) {
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state->err = ret;
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state->err_list[idx] = state->err;
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}
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}
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state->done += 1;
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if (state->done == state->count) {
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tevent_req_done(req);
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}
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}
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bool ctdb_client_message_multi_recv(struct tevent_req *req, int *perr,
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TALLOC_CTX *mem_ctx, int **perr_list)
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{
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struct ctdb_client_message_multi_state *state = tevent_req_data(
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req, struct ctdb_client_message_multi_state);
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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if (perr != NULL) {
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*perr = err;
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}
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if (perr_list != NULL) {
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*perr_list = talloc_steal(mem_ctx, state->err_list);
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}
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return false;
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}
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if (perr != NULL) {
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*perr = state->err;
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}
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if (perr_list != NULL) {
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*perr_list = talloc_steal(mem_ctx, state->err_list);
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}
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if (state->err != 0) {
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return false;
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}
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return true;
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}
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/*
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* sync version of message send
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*/
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int ctdb_client_message(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint32_t destnode, struct ctdb_req_message *message)
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{
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TALLOC_CTX *tmp_ctx;
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struct tevent_req *req;
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int ret;
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bool status;
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tmp_ctx = talloc_new(client);
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if (tmp_ctx == NULL) {
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return ENOMEM;
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}
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req = ctdb_client_message_send(tmp_ctx, ev, client, destnode, message);
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if (req == NULL) {
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talloc_free(tmp_ctx);
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return ENOMEM;
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}
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tevent_req_poll(req, ev);
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status = ctdb_client_message_recv(req, &ret);
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if (! status) {
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talloc_free(tmp_ctx);
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return ret;
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}
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talloc_free(tmp_ctx);
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return 0;
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}
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int ctdb_client_message_multi(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint32_t *pnn_list, int count,
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struct ctdb_req_message *message,
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int **perr_list)
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{
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struct tevent_req *req;
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bool status;
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int ret;
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req = ctdb_client_message_multi_send(mem_ctx, ev, client,
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pnn_list, count,
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message);
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if (req == NULL) {
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return ENOMEM;
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}
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tevent_req_poll(req, ev);
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status = ctdb_client_message_multi_recv(req, &ret, mem_ctx, perr_list);
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if (! status) {
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return ret;
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}
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return 0;
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}
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struct ctdb_client_set_message_handler_state {
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struct ctdb_client_context *client;
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uint64_t srvid;
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srvid_handler_fn handler;
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void *private_data;
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};
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static void ctdb_client_set_message_handler_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_client_set_message_handler_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint64_t srvid,
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srvid_handler_fn handler,
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void *private_data)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_client_set_message_handler_state *state;
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struct ctdb_req_control request;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_client_set_message_handler_state);
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if (req == NULL) {
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return NULL;
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}
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state->client = client;
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state->srvid = srvid;
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state->handler = handler;
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state->private_data = private_data;
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ctdb_req_control_register_srvid(&request, srvid);
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subreq = ctdb_client_control_send(state, ev, client, client->pnn,
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tevent_timeval_zero(), &request);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, ctdb_client_set_message_handler_done,
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req);
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return req;
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}
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static void ctdb_client_set_message_handler_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_client_set_message_handler_state *state = tevent_req_data(
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req, struct ctdb_client_set_message_handler_state);
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struct ctdb_reply_control *reply;
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bool status;
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int ret;
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status = ctdb_client_control_recv(subreq, &ret, state, &reply);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_reply_control_register_srvid(reply);
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talloc_free(reply);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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ret = srvid_register(state->client->srv, state->client, state->srvid,
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state->handler, state->private_data);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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tevent_req_done(req);
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}
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bool ctdb_client_set_message_handler_recv(struct tevent_req *req, int *perr)
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{
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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if (perr != NULL) {
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*perr = err;
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}
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return false;
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}
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return true;
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}
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struct ctdb_client_remove_message_handler_state {
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struct ctdb_client_context *client;
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uint64_t srvid;
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void *private_data;
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};
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static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_client_remove_message_handler_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint64_t srvid,
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void *private_data)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_client_remove_message_handler_state *state;
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struct ctdb_req_control request;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_client_remove_message_handler_state);
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if (req == NULL) {
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return NULL;
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}
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state->client = client;
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state->srvid = srvid;
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state->private_data = private_data;
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ctdb_req_control_deregister_srvid(&request, srvid);
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subreq = ctdb_client_control_send(state, ev, client, client->pnn,
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tevent_timeval_zero(), &request);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq,
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ctdb_client_remove_message_handler_done, req);
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return req;
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}
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static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_client_remove_message_handler_state *state = tevent_req_data(
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req, struct ctdb_client_remove_message_handler_state);
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struct ctdb_reply_control *reply;
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bool status;
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int ret;
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status = ctdb_client_control_recv(subreq, &ret, state, &reply);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_reply_control_deregister_srvid(reply);
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talloc_free(reply);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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ret = srvid_deregister(state->client->srv, state->srvid,
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state->private_data);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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tevent_req_done(req);
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}
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bool ctdb_client_remove_message_handler_recv(struct tevent_req *req, int *perr)
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{
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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if (perr != NULL) {
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*perr = err;
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}
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return false;
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}
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return true;
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}
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int ctdb_client_set_message_handler(struct tevent_context *ev,
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struct ctdb_client_context *client,
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|
uint64_t srvid, srvid_handler_fn handler,
|
|
void *private_data)
|
|
{
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|
TALLOC_CTX *mem_ctx;
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int ret;
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|
|
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mem_ctx = talloc_new(client);
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if (mem_ctx == NULL) {
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|
return ENOMEM;
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}
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|
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ret = ctdb_ctrl_register_srvid(mem_ctx, ev, client, client->pnn,
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tevent_timeval_zero(), srvid);
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talloc_free(mem_ctx);
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if (ret != 0) {
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|
return ret;
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}
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|
|
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return srvid_register(client->srv, client, srvid,
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|
handler, private_data);
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|
}
|
|
|
|
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;
|
|
int ret;
|
|
|
|
mem_ctx = talloc_new(client);
|
|
if (mem_ctx == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
ret = ctdb_ctrl_deregister_srvid(mem_ctx, ev, client, client->pnn,
|
|
tevent_timeval_zero(), srvid);
|
|
talloc_free(mem_ctx);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
return srvid_deregister(client->srv, srvid, private_data);
|
|
}
|