source: vendor/current/ctdb/client/client_message.c

Last change on this file was 989, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.7
File size: 12.1 KB
Line 
1/*
2 CTDB client code
3
4 Copyright (C) Amitay Isaacs 2015
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "replace.h"
21#include "system/network.h"
22#include "system/filesys.h"
23
24#include <talloc.h>
25#include <tevent.h>
26#include <tdb.h>
27
28#include "lib/util/tevent_unix.h"
29
30#include "common/reqid.h"
31#include "common/srvid.h"
32#include "common/comm.h"
33
34#include "protocol/protocol.h"
35#include "protocol/protocol_api.h"
36
37#include "client/client_private.h"
38#include "client/client.h"
39
40
41/*
42 * Handle REQ_MESSAGE
43 */
44
45struct ctdb_client_message_state {
46 struct ctdb_client_context *client;
47 uint32_t reqid;
48};
49
50static int ctdb_client_message_state_destructor(
51 struct ctdb_client_message_state *state);
52static void ctdb_client_message_done(struct tevent_req *subreq);
53
54struct tevent_req *ctdb_client_message_send(TALLOC_CTX *mem_ctx,
55 struct tevent_context *ev,
56 struct ctdb_client_context *client,
57 uint32_t destnode,
58 struct ctdb_req_message *message)
59{
60 struct tevent_req *req, *subreq;
61 struct ctdb_client_message_state *state;
62 struct ctdb_req_header h;
63 uint32_t reqid;
64 uint8_t *buf;
65 size_t buflen;
66 int ret;
67
68 req = tevent_req_create(mem_ctx, &state,
69 struct ctdb_client_message_state);
70 if (req == NULL) {
71 return NULL;
72 }
73
74 reqid = reqid_new(client->idr, state);
75 if (reqid == REQID_INVALID) {
76 talloc_free(req);
77 return NULL;
78 }
79
80 state->client = client;
81 state->reqid = reqid;
82
83 talloc_set_destructor(state, ctdb_client_message_state_destructor);
84
85 ctdb_req_header_fill(&h, 0, CTDB_REQ_MESSAGE, destnode,
86 client->pnn, reqid);
87
88 ret = ctdb_req_message_push(&h, message, state, &buf, &buflen);
89 if (ret != 0) {
90 tevent_req_error(req, ret);
91 return tevent_req_post(req, ev);
92 }
93
94 subreq = comm_write_send(state, ev, client->comm, buf, buflen);
95 if (tevent_req_nomem(subreq, req)) {
96 return tevent_req_post(req, ev);
97 }
98 tevent_req_set_callback(subreq, ctdb_client_message_done, req);
99
100 return req;
101}
102
103static int ctdb_client_message_state_destructor(
104 struct ctdb_client_message_state *state)
105{
106 reqid_remove(state->client->idr, state->reqid);
107 return 0;
108}
109
110static void ctdb_client_message_done(struct tevent_req *subreq)
111{
112 struct tevent_req *req = tevent_req_callback_data(
113 subreq, struct tevent_req);
114 int ret;
115 bool status;
116
117 status = comm_write_recv(subreq, &ret);
118 TALLOC_FREE(subreq);
119 if (! status) {
120 tevent_req_error(req, ret);
121 return;
122 }
123
124 tevent_req_done(req);
125}
126
127bool ctdb_client_message_recv(struct tevent_req *req, int *perr)
128{
129 int err;
130
131 if (tevent_req_is_unix_error(req, &err)) {
132 if (perr != NULL) {
133 *perr = err;
134 }
135 return false;
136 }
137
138 return true;
139}
140
141void ctdb_client_req_message(struct ctdb_client_context *client,
142 uint8_t *buf, size_t buflen, uint32_t reqid)
143{
144 struct ctdb_req_header h;
145 struct ctdb_req_message_data message;
146 TALLOC_CTX *tmp_ctx = talloc_new(client);
147 int ret;
148
149 ret = ctdb_req_message_data_pull(buf, buflen, &h, tmp_ctx, &message);
150 if (ret != 0) {
151 return;
152 }
153
154 srvid_dispatch(client->srv, message.srvid, CTDB_SRVID_ALL,
155 message.data);
156 talloc_free(tmp_ctx);
157}
158
159/*
160 * Handle multiple nodes
161 */
162
163struct ctdb_client_message_multi_state {
164 uint32_t *pnn_list;
165 int count;
166 int done;
167 int err;
168 int *err_list;
169};
170
171struct message_index_state {
172 struct tevent_req *req;
173 int index;
174};
175
176static void ctdb_client_message_multi_done(struct tevent_req *subreq);
177
178struct tevent_req *ctdb_client_message_multi_send(
179 TALLOC_CTX *mem_ctx,
180 struct tevent_context *ev,
181 struct ctdb_client_context *client,
182 uint32_t *pnn_list, int count,
183 struct ctdb_req_message *message)
184{
185 struct tevent_req *req, *subreq;
186 struct ctdb_client_message_multi_state *state;
187 int i;
188
189 if (pnn_list == NULL || count == 0) {
190 return NULL;
191 }
192
193 req = tevent_req_create(mem_ctx, &state,
194 struct ctdb_client_message_multi_state);
195 if (req == NULL) {
196 return NULL;
197 }
198
199 state->pnn_list = pnn_list;
200 state->count = count;
201 state->done = 0;
202 state->err = 0;
203 state->err_list = talloc_zero_array(state, int, count);
204 if (tevent_req_nomem(state->err_list, req)) {
205 return tevent_req_post(req, ev);
206 }
207
208 for (i=0; i<count; i++) {
209 struct message_index_state *substate;
210
211 subreq = ctdb_client_message_send(state, ev, client,
212 pnn_list[i], message);
213 if (tevent_req_nomem(subreq, req)) {
214 return tevent_req_post(req, ev);
215 }
216
217 substate = talloc(subreq, struct message_index_state);
218 if (tevent_req_nomem(substate, req)) {
219 return tevent_req_post(req, ev);
220 }
221
222 substate->req = req;
223 substate->index = i;
224
225 tevent_req_set_callback(subreq, ctdb_client_message_multi_done,
226 substate);
227 }
228
229 return req;
230}
231
232static void ctdb_client_message_multi_done(struct tevent_req *subreq)
233{
234 struct message_index_state *substate = tevent_req_callback_data(
235 subreq, struct message_index_state);
236 struct tevent_req *req = substate->req;
237 int idx = substate->index;
238 struct ctdb_client_message_multi_state *state = tevent_req_data(
239 req, struct ctdb_client_message_multi_state);
240 bool status;
241 int ret;
242
243 status = ctdb_client_message_recv(subreq, &ret);
244 TALLOC_FREE(subreq);
245 if (! status) {
246 if (state->err == 0) {
247 state->err = ret;
248 state->err_list[idx] = state->err;
249 }
250 }
251
252 state->done += 1;
253
254 if (state->done == state->count) {
255 tevent_req_done(req);
256 }
257}
258
259bool ctdb_client_message_multi_recv(struct tevent_req *req, int *perr,
260 TALLOC_CTX *mem_ctx, int **perr_list)
261{
262 struct ctdb_client_message_multi_state *state = tevent_req_data(
263 req, struct ctdb_client_message_multi_state);
264 int err;
265
266 if (tevent_req_is_unix_error(req, &err)) {
267 if (perr != NULL) {
268 *perr = err;
269 }
270 if (perr_list != NULL) {
271 *perr_list = talloc_steal(mem_ctx, state->err_list);
272 }
273 return false;
274 }
275
276 if (perr != NULL) {
277 *perr = state->err;
278 }
279
280 if (perr_list != NULL) {
281 *perr_list = talloc_steal(mem_ctx, state->err_list);
282 }
283
284 if (state->err != 0) {
285 return false;
286 }
287
288 return true;
289}
290
291/*
292 * sync version of message send
293 */
294
295int ctdb_client_message(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
296 struct ctdb_client_context *client,
297 uint32_t destnode, struct ctdb_req_message *message)
298{
299 TALLOC_CTX *tmp_ctx;
300 struct tevent_req *req;
301 int ret;
302 bool status;
303
304 tmp_ctx = talloc_new(client);
305 if (tmp_ctx == NULL) {
306 return ENOMEM;
307 }
308
309 req = ctdb_client_message_send(tmp_ctx, ev, client, destnode, message);
310 if (req == NULL) {
311 talloc_free(tmp_ctx);
312 return ENOMEM;
313 }
314
315 tevent_req_poll(req, ev);
316
317 status = ctdb_client_message_recv(req, &ret);
318 if (! status) {
319 talloc_free(tmp_ctx);
320 return ret;
321 }
322
323 talloc_free(tmp_ctx);
324 return 0;
325}
326
327struct ctdb_client_set_message_handler_state {
328 struct ctdb_client_context *client;
329 uint64_t srvid;
330 srvid_handler_fn handler;
331 void *private_data;
332};
333
334static void ctdb_client_set_message_handler_done(struct tevent_req *subreq);
335
336struct tevent_req *ctdb_client_set_message_handler_send(
337 TALLOC_CTX *mem_ctx,
338 struct tevent_context *ev,
339 struct ctdb_client_context *client,
340 uint64_t srvid,
341 srvid_handler_fn handler,
342 void *private_data)
343{
344 struct tevent_req *req, *subreq;
345 struct ctdb_client_set_message_handler_state *state;
346 struct ctdb_req_control request;
347
348 req = tevent_req_create(mem_ctx, &state,
349 struct ctdb_client_set_message_handler_state);
350 if (req == NULL) {
351 return NULL;
352 }
353
354 state->client = client;
355 state->srvid = srvid;
356 state->handler = handler;
357 state->private_data = private_data;
358
359 ctdb_req_control_register_srvid(&request, srvid);
360 subreq = ctdb_client_control_send(state, ev, client, client->pnn,
361 tevent_timeval_zero(), &request);
362 if (tevent_req_nomem(subreq, req)) {
363 return tevent_req_post(req, ev);
364 }
365 tevent_req_set_callback(subreq, ctdb_client_set_message_handler_done,
366 req);
367
368 return req;
369}
370
371static void ctdb_client_set_message_handler_done(struct tevent_req *subreq)
372{
373 struct tevent_req *req = tevent_req_callback_data(
374 subreq, struct tevent_req);
375 struct ctdb_client_set_message_handler_state *state = tevent_req_data(
376 req, struct ctdb_client_set_message_handler_state);
377 struct ctdb_reply_control *reply;
378 bool status;
379 int ret;
380
381 status = ctdb_client_control_recv(subreq, &ret, state, &reply);
382 TALLOC_FREE(subreq);
383 if (! status) {
384 tevent_req_error(req, ret);
385 return;
386 }
387
388 ret = ctdb_reply_control_register_srvid(reply);
389 talloc_free(reply);
390 if (ret != 0) {
391 tevent_req_error(req, ret);
392 return;
393 }
394
395 ret = srvid_register(state->client->srv, state->client, state->srvid,
396 state->handler, state->private_data);
397 if (ret != 0) {
398 tevent_req_error(req, ret);
399 return;
400 }
401
402 tevent_req_done(req);
403}
404
405bool ctdb_client_set_message_handler_recv(struct tevent_req *req, int *perr)
406{
407 int err;
408
409 if (tevent_req_is_unix_error(req, &err)) {
410 if (perr != NULL) {
411 *perr = err;
412 }
413 return false;
414 }
415 return true;
416}
417
418struct ctdb_client_remove_message_handler_state {
419 struct ctdb_client_context *client;
420 uint64_t srvid;
421 void *private_data;
422};
423
424static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq);
425
426struct tevent_req *ctdb_client_remove_message_handler_send(
427 TALLOC_CTX *mem_ctx,
428 struct tevent_context *ev,
429 struct ctdb_client_context *client,
430 uint64_t srvid,
431 void *private_data)
432{
433 struct tevent_req *req, *subreq;
434 struct ctdb_client_remove_message_handler_state *state;
435 struct ctdb_req_control request;
436
437 req = tevent_req_create(mem_ctx, &state,
438 struct ctdb_client_remove_message_handler_state);
439 if (req == NULL) {
440 return NULL;
441 }
442
443 state->client = client;
444 state->srvid = srvid;
445 state->private_data = private_data;
446
447 ctdb_req_control_deregister_srvid(&request, srvid);
448 subreq = ctdb_client_control_send(state, ev, client, client->pnn,
449 tevent_timeval_zero(), &request);
450 if (tevent_req_nomem(subreq, req)) {
451 return tevent_req_post(req, ev);
452 }
453 tevent_req_set_callback(subreq,
454 ctdb_client_remove_message_handler_done, req);
455
456 return req;
457}
458
459static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq)
460{
461 struct tevent_req *req = tevent_req_callback_data(
462 subreq, struct tevent_req);
463 struct ctdb_client_remove_message_handler_state *state = tevent_req_data(
464 req, struct ctdb_client_remove_message_handler_state);
465 struct ctdb_reply_control *reply;
466 bool status;
467 int ret;
468
469 status = ctdb_client_control_recv(subreq, &ret, state, &reply);
470 TALLOC_FREE(subreq);
471 if (! status) {
472 tevent_req_error(req, ret);
473 return;
474 }
475
476 ret = ctdb_reply_control_deregister_srvid(reply);
477 talloc_free(reply);
478 if (ret != 0) {
479 tevent_req_error(req, ret);
480 return;
481 }
482
483 ret = srvid_deregister(state->client->srv, state->srvid,
484 state->private_data);
485 if (ret != 0) {
486 tevent_req_error(req, ret);
487 return;
488 }
489
490 tevent_req_done(req);
491}
492
493bool ctdb_client_remove_message_handler_recv(struct tevent_req *req, int *perr)
494{
495 int err;
496
497 if (tevent_req_is_unix_error(req, &err)) {
498 if (perr != NULL) {
499 *perr = err;
500 }
501 return false;
502 }
503 return true;
504}
505
506int ctdb_client_set_message_handler(TALLOC_CTX *mem_ctx,
507 struct tevent_context *ev,
508 struct ctdb_client_context *client,
509 uint64_t srvid, srvid_handler_fn handler,
510 void *private_data)
511{
512 int ret;
513
514 ret = ctdb_ctrl_register_srvid(mem_ctx, ev, client, client->pnn,
515 tevent_timeval_zero(), srvid);
516 if (ret != 0) {
517 return ret;
518 }
519
520 return srvid_register(client->srv, client, srvid,
521 handler, private_data);
522}
523
524int ctdb_client_remove_message_handler(TALLOC_CTX *mem_ctx,
525 struct tevent_context *ev,
526 struct ctdb_client_context *client,
527 uint64_t srvid, void *private_data)
528{
529 int ret;
530
531 ret = ctdb_ctrl_deregister_srvid(mem_ctx, ev, client, client->pnn,
532 tevent_timeval_zero(), srvid);
533 if (ret != 0) {
534 return ret;
535 }
536
537 return srvid_deregister(client->srv, srvid, private_data);
538}
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