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https://github.com/samba-team/samba.git
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99c33e6f98
Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net>
352 lines
7.3 KiB
C
352 lines
7.3 KiB
C
/*
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CTDB event daemon client
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Copyright (C) Amitay Isaacs 2018
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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 <talloc.h>
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#include <tevent.h>
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#include "lib/util/debug.h"
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#include "lib/util/tevent_unix.h"
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#include "common/logging.h"
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#include "common/path.h"
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#include "common/sock_client.h"
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#include "event/event_protocol_api.h"
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#include "event/event.h"
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struct ctdb_event_context {
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char *socket;
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struct sock_client_context *sockc;
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};
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struct event_request {
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struct ctdb_event_header header;
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struct ctdb_event_request *request;
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};
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struct event_reply {
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struct ctdb_event_header header;
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struct ctdb_event_reply *reply;
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};
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static int event_request_push(void *request_data,
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uint32_t reqid,
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TALLOC_CTX *mem_ctx,
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uint8_t **buf,
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size_t *buflen,
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void *private_data)
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{
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struct event_request *r = (struct event_request *)request_data;
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int ret;
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r->header.reqid = reqid;
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*buflen = ctdb_event_request_len(&r->header, r->request);
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*buf = talloc_size(mem_ctx, *buflen);
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if (*buf == NULL) {
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return ENOMEM;
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}
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ret = ctdb_event_request_push(&r->header, r->request, *buf, buflen);
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if (ret != 0) {
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talloc_free(*buf);
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return ret;
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}
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return 0;
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}
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static int event_reply_pull(uint8_t *buf,
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size_t buflen,
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TALLOC_CTX *mem_ctx,
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void **reply_data,
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void *private_data)
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{
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struct event_reply *r;
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int ret;
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r = talloc_zero(mem_ctx, struct event_reply);
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if (r == NULL) {
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return ENOMEM;
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}
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ret = ctdb_event_reply_pull(buf, buflen, &r->header, r, &r->reply);
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if (ret != 0) {
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talloc_free(r);
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return ret;
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}
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*reply_data = r;
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return 0;
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}
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static int event_reply_reqid(uint8_t *buf,
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size_t buflen,
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uint32_t *reqid,
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void *private_data)
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{
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struct ctdb_event_header header;
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int ret;
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ret = ctdb_event_header_extract(buf, buflen, &header);
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if (ret != 0) {
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return ret;
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}
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*reqid = header.reqid;
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return 0;
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}
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struct sock_client_proto_funcs event_proto_funcs = {
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.request_push = event_request_push,
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.reply_pull = event_reply_pull,
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.reply_reqid = event_reply_reqid,
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};
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int ctdb_event_init(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_event_context **result)
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{
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struct ctdb_event_context *eclient;
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int ret;
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eclient = talloc_zero(mem_ctx, struct ctdb_event_context);
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if (eclient == NULL) {
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return ENOMEM;
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}
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eclient->socket = path_socket(eclient, "eventd");
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if (eclient->socket == NULL) {
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talloc_free(eclient);
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return ENOMEM;
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}
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ret = sock_client_setup(eclient,
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ev,
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eclient->socket,
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&event_proto_funcs,
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eclient,
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&eclient->sockc);
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if (ret != 0) {
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talloc_free(eclient);
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return ret;
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}
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*result = eclient;
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return 0;
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}
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/*
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* Handle request and reply
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*/
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struct ctdb_event_msg_state {
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struct event_request e_request;
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struct event_reply *e_reply;
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};
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static void ctdb_event_msg_done(struct tevent_req *subreq);
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static struct tevent_req *ctdb_event_msg_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_event_context *eclient,
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struct ctdb_event_request *request)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_event_msg_state *state;
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req = tevent_req_create(mem_ctx, &state, struct ctdb_event_msg_state);
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if (req == NULL) {
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return NULL;
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}
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state->e_request.request = request;
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subreq = sock_client_msg_send(mem_ctx,
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ev,
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eclient->sockc,
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tevent_timeval_zero(),
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&state->e_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_event_msg_done, req);
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return req;
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}
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static void ctdb_event_msg_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_event_msg_state *state = tevent_req_data(
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req, struct ctdb_event_msg_state);
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int ret = 0;
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bool ok;
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ok = sock_client_msg_recv(subreq, &ret, state, &state->e_reply);
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TALLOC_FREE(subreq);
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if (!ok) {
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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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static bool ctdb_event_msg_recv(struct tevent_req *req,
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int *perr,
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TALLOC_CTX *mem_ctx,
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struct ctdb_event_reply **reply)
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{
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struct ctdb_event_msg_state *state = tevent_req_data(
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req, struct ctdb_event_msg_state);
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int ret = 0;
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if (tevent_req_is_unix_error(req, &ret)) {
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if (perr != NULL) {
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*perr = ret;
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}
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return false;
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}
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*reply = talloc_steal(mem_ctx, state->e_reply->reply);
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return true;
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}
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/*
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* API functions
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*/
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struct tevent_req *ctdb_event_run_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_event_context *eclient,
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struct ctdb_event_request_run *run)
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{
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struct ctdb_event_request request;
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request.cmd = CTDB_EVENT_CMD_RUN;
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request.data.run = run;
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return ctdb_event_msg_send(mem_ctx, ev, eclient, &request);
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}
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bool ctdb_event_run_recv(struct tevent_req *req, int *perr, int *result)
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{
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struct ctdb_event_reply *reply = NULL;
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bool ok;
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ok = ctdb_event_msg_recv(req, perr, req, &reply);
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if (!ok) {
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return false;
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}
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if (reply->cmd != CTDB_EVENT_CMD_RUN) {
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*result = EPROTO;
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} else {
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*result = reply->result;
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}
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talloc_free(reply);
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return true;
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}
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struct tevent_req *ctdb_event_status_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_event_context *eclient,
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struct ctdb_event_request_status *status)
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{
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struct ctdb_event_request request;
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request.cmd = CTDB_EVENT_CMD_STATUS;
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request.data.status = status;
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return ctdb_event_msg_send(mem_ctx, ev, eclient, &request);
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}
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bool ctdb_event_status_recv(struct tevent_req *req,
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int *perr,
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int *result,
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TALLOC_CTX *mem_ctx,
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struct ctdb_event_reply_status **status)
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{
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struct ctdb_event_reply *reply = NULL;
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bool ok;
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ok = ctdb_event_msg_recv(req, perr, req, &reply);
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if (!ok) {
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return false;
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}
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if (reply->cmd != CTDB_EVENT_CMD_STATUS) {
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*result = EPROTO;
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} else {
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*result = reply->result;
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}
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if (reply->result == 0) {
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*status = talloc_steal(mem_ctx, reply->data.status);
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} else {
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*status = NULL;
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}
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talloc_free(reply);
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return true;
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}
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struct tevent_req *ctdb_event_script_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_event_context *eclient,
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struct ctdb_event_request_script *script)
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{
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struct ctdb_event_request request;
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request.cmd = CTDB_EVENT_CMD_SCRIPT;
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request.data.script = script;
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return ctdb_event_msg_send(mem_ctx, ev, eclient, &request);
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}
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bool ctdb_event_script_recv(struct tevent_req *req, int *perr, int *result)
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{
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struct ctdb_event_reply *reply = NULL;
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bool ok;
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ok = ctdb_event_msg_recv(req, perr, req, &reply);
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if (!ok) {
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return false;
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}
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if (reply->cmd != CTDB_EVENT_CMD_SCRIPT) {
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*result = EPROTO;
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} else {
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*result = reply->result;
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}
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talloc_free(reply);
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return true;
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}
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