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ctdb-event: Add event daemon client code

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Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
This commit is contained in:
Amitay Isaacs 2018-04-24 17:22:42 +10:00 committed by Martin Schwenke
parent 24ba8e7c31
commit 99c33e6f98
3 changed files with 411 additions and 0 deletions
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55
ctdb/event/event.h Normal file
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@ -0,0 +1,55 @@
/*
CTDB event daemon client
Copyright (C) Amitay Isaacs 2018
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/>.
*/
#ifndef __CTDB_EVENT_H__
#define __CTDB_EVENT_H__
#include "event/event_protocol.h"
struct ctdb_event_context;
int ctdb_event_init(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context **result);
struct tevent_req *ctdb_event_run_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request_run *run);
bool ctdb_event_run_recv(struct tevent_req *req, int *perr, int *result);
struct tevent_req *ctdb_event_status_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request_status *status);
bool ctdb_event_status_recv(struct tevent_req *req,
int *perr,
int *result,
TALLOC_CTX *mem_ctx,
struct ctdb_event_reply_status **status);
struct tevent_req *ctdb_event_script_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request_script *script);
bool ctdb_event_script_recv(struct tevent_req *req, int *perr, int *result);
#endif /* __CTDB_EVENT_H__ */

351
ctdb/event/event_client.c Normal file
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@ -0,0 +1,351 @@
/*
CTDB event daemon client
Copyright (C) Amitay Isaacs 2018
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 <talloc.h>
#include <tevent.h>
#include "lib/util/debug.h"
#include "lib/util/tevent_unix.h"
#include "common/logging.h"
#include "common/path.h"
#include "common/sock_client.h"
#include "event/event_protocol_api.h"
#include "event/event.h"
struct ctdb_event_context {
char *socket;
struct sock_client_context *sockc;
};
struct event_request {
struct ctdb_event_header header;
struct ctdb_event_request *request;
};
struct event_reply {
struct ctdb_event_header header;
struct ctdb_event_reply *reply;
};
static int event_request_push(void *request_data,
uint32_t reqid,
TALLOC_CTX *mem_ctx,
uint8_t **buf,
size_t *buflen,
void *private_data)
{
struct event_request *r = (struct event_request *)request_data;
int ret;
r->header.reqid = reqid;
*buflen = ctdb_event_request_len(&r->header, r->request);
*buf = talloc_size(mem_ctx, *buflen);
if (*buf == NULL) {
return ENOMEM;
}
ret = ctdb_event_request_push(&r->header, r->request, *buf, buflen);
if (ret != 0) {
talloc_free(*buf);
return ret;
}
return 0;
}
static int event_reply_pull(uint8_t *buf,
size_t buflen,
TALLOC_CTX *mem_ctx,
void **reply_data,
void *private_data)
{
struct event_reply *r;
int ret;
r = talloc_zero(mem_ctx, struct event_reply);
if (r == NULL) {
return ENOMEM;
}
ret = ctdb_event_reply_pull(buf, buflen, &r->header, r, &r->reply);
if (ret != 0) {
talloc_free(r);
return ret;
}
*reply_data = r;
return 0;
}
static int event_reply_reqid(uint8_t *buf,
size_t buflen,
uint32_t *reqid,
void *private_data)
{
struct ctdb_event_header header;
int ret;
ret = ctdb_event_header_extract(buf, buflen, &header);
if (ret != 0) {
return ret;
}
*reqid = header.reqid;
return 0;
}
struct sock_client_proto_funcs event_proto_funcs = {
.request_push = event_request_push,
.reply_pull = event_reply_pull,
.reply_reqid = event_reply_reqid,
};
int ctdb_event_init(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context **result)
{
struct ctdb_event_context *eclient;
int ret;
eclient = talloc_zero(mem_ctx, struct ctdb_event_context);
if (eclient == NULL) {
return ENOMEM;
}
eclient->socket = path_socket(eclient, "eventd");
if (eclient->socket == NULL) {
talloc_free(eclient);
return ENOMEM;
}
ret = sock_client_setup(eclient,
ev,
eclient->socket,
&event_proto_funcs,
eclient,
&eclient->sockc);
if (ret != 0) {
talloc_free(eclient);
return ret;
}
*result = eclient;
return 0;
}
/*
* Handle request and reply
*/
struct ctdb_event_msg_state {
struct event_request e_request;
struct event_reply *e_reply;
};
static void ctdb_event_msg_done(struct tevent_req *subreq);
static struct tevent_req *ctdb_event_msg_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request *request)
{
struct tevent_req *req, *subreq;
struct ctdb_event_msg_state *state;
req = tevent_req_create(mem_ctx, &state, struct ctdb_event_msg_state);
if (req == NULL) {
return NULL;
}
state->e_request.request = request;
subreq = sock_client_msg_send(mem_ctx,
ev,
eclient->sockc,
tevent_timeval_zero(),
&state->e_request);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_event_msg_done, req);
return req;
}
static void ctdb_event_msg_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct ctdb_event_msg_state *state = tevent_req_data(
req, struct ctdb_event_msg_state);
int ret = 0;
bool ok;
ok = sock_client_msg_recv(subreq, &ret, state, &state->e_reply);
TALLOC_FREE(subreq);
if (!ok) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
static bool ctdb_event_msg_recv(struct tevent_req *req,
int *perr,
TALLOC_CTX *mem_ctx,
struct ctdb_event_reply **reply)
{
struct ctdb_event_msg_state *state = tevent_req_data(
req, struct ctdb_event_msg_state);
int ret = 0;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
*reply = talloc_steal(mem_ctx, state->e_reply->reply);
return true;
}
/*
* API functions
*/
struct tevent_req *ctdb_event_run_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request_run *run)
{
struct ctdb_event_request request;
request.cmd = CTDB_EVENT_CMD_RUN;
request.data.run = run;
return ctdb_event_msg_send(mem_ctx, ev, eclient, &request);
}
bool ctdb_event_run_recv(struct tevent_req *req, int *perr, int *result)
{
struct ctdb_event_reply *reply = NULL;
bool ok;
ok = ctdb_event_msg_recv(req, perr, req, &reply);
if (!ok) {
return false;
}
if (reply->cmd != CTDB_EVENT_CMD_RUN) {
*result = EPROTO;
} else {
*result = reply->result;
}
talloc_free(reply);
return true;
}
struct tevent_req *ctdb_event_status_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request_status *status)
{
struct ctdb_event_request request;
request.cmd = CTDB_EVENT_CMD_STATUS;
request.data.status = status;
return ctdb_event_msg_send(mem_ctx, ev, eclient, &request);
}
bool ctdb_event_status_recv(struct tevent_req *req,
int *perr,
int *result,
TALLOC_CTX *mem_ctx,
struct ctdb_event_reply_status **status)
{
struct ctdb_event_reply *reply = NULL;
bool ok;
ok = ctdb_event_msg_recv(req, perr, req, &reply);
if (!ok) {
return false;
}
if (reply->cmd != CTDB_EVENT_CMD_STATUS) {
*result = EPROTO;
} else {
*result = reply->result;
}
if (reply->result == 0) {
*status = talloc_steal(mem_ctx, reply->data.status);
} else {
*status = NULL;
}
talloc_free(reply);
return true;
}
struct tevent_req *ctdb_event_script_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_event_context *eclient,
struct ctdb_event_request_script *script)
{
struct ctdb_event_request request;
request.cmd = CTDB_EVENT_CMD_SCRIPT;
request.data.script = script;
return ctdb_event_msg_send(mem_ctx, ev, eclient, &request);
}
bool ctdb_event_script_recv(struct tevent_req *req, int *perr, int *result)
{
struct ctdb_event_reply *reply = NULL;
bool ok;
ok = ctdb_event_msg_recv(req, perr, req, &reply);
if (!ok) {
return false;
}
if (reply->cmd != CTDB_EVENT_CMD_SCRIPT) {
*result = EPROTO;
} else {
*result = reply->result;
}
talloc_free(reply);
return true;
}

5
ctdb/wscript
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@ -504,6 +504,11 @@ def build(bld):
'''),
deps='ctdb-protocol-basic')
bld.SAMBA_LIBRARY('ctdb-event-client',
source='event/event_client.c',
deps='ctdb-event-protocol ctdb-util tevent talloc',
private_library=True)
bld.SAMBA_BINARY('ctdb-eventd',
source=bld.SUBDIR('event',
'''event_cmd.c