ctdb/client/client_message.c

   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
  45 struct ctdb_client_message_state {
  46         struct ctdb_client_context *client;
  47         uint32_t reqid;
  48 };
  49
  50 static int ctdb_client_message_state_destructor(
  51         struct ctdb_client_message_state *state);
  52 static void ctdb_client_message_done(struct tevent_req *subreq);
  53
  54 struct 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 datalen, 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         datalen = ctdb_req_message_len(&h, message);
  89         ret = ctdb_allocate_pkt(state, datalen, &buf, &buflen);
  90         if (ret != 0) {
  91                 tevent_req_error(req, ret);
  92                 return tevent_req_post(req, ev);
  93         }
  94
  95         ret = ctdb_req_message_push(&h, message, buf, &buflen);
  96         if (ret != 0) {
  97                 tevent_req_error(req, ret);
  98                 return tevent_req_post(req, ev);
  99         }
 100
 101         subreq = comm_write_send(state, ev, client->comm, buf, buflen);
 102         if (tevent_req_nomem(subreq, req)) {
 103                 return tevent_req_post(req, ev);
 104         }
 105         tevent_req_set_callback(subreq, ctdb_client_message_done, req);
 106
 107         return req;
 108 }
 109
 110 static int ctdb_client_message_state_destructor(
 111         struct ctdb_client_message_state *state)
 112 {
 113         reqid_remove(state->client->idr, state->reqid);
 114         return 0;
 115 }
 116
 117 static void ctdb_client_message_done(struct tevent_req *subreq)
 118 {
 119         struct tevent_req *req = tevent_req_callback_data(
 120                 subreq, struct tevent_req);
 121         int ret;
 122         bool status;
 123
 124         status = comm_write_recv(subreq, &ret);
 125         TALLOC_FREE(subreq);
 126         if (! status) {
 127                 tevent_req_error(req, ret);
 128                 return;
 129         }
 130
 131         tevent_req_done(req);
 132 }
 133
 134 bool ctdb_client_message_recv(struct tevent_req *req, int *perr)
 135 {
 136         int err;
 137
 138         if (tevent_req_is_unix_error(req, &err)) {
 139                 if (perr != NULL) {
 140                         *perr = err;
 141                 }
 142                 return false;
 143         }
 144
 145         return true;
 146 }
 147
 148 void ctdb_client_req_message(struct ctdb_client_context *client,
 149                              uint8_t *buf, size_t buflen, uint32_t reqid)
 150 {
 151         struct ctdb_req_header h;
 152         struct ctdb_req_message_data message;
 153         TALLOC_CTX *tmp_ctx = talloc_new(client);
 154         int ret;
 155
 156         ret = ctdb_req_message_data_pull(buf, buflen, &h, tmp_ctx, &message);
 157         if (ret != 0) {
 158                 return;
 159         }
 160
 161         srvid_dispatch(client->srv, message.srvid, CTDB_SRVID_ALL,
 162                        message.data);
 163         talloc_free(tmp_ctx);
 164 }
 165
 166 /*
 167  * Handle multiple nodes
 168  */
 169
 170 struct ctdb_client_message_multi_state {
 171         uint32_t *pnn_list;
 172         int count;
 173         int done;
 174         int err;
 175         int *err_list;
 176 };
 177
 178 struct message_index_state {
 179         struct tevent_req *req;
 180         int index;
 181 };
 182
 183 static void ctdb_client_message_multi_done(struct tevent_req *subreq);
 184
 185 struct tevent_req *ctdb_client_message_multi_send(
 186                                 TALLOC_CTX *mem_ctx,
 187                                 struct tevent_context *ev,
 188                                 struct ctdb_client_context *client,
 189                                 uint32_t *pnn_list, int count,
 190                                 struct ctdb_req_message *message)
 191 {
 192         struct tevent_req *req, *subreq;
 193         struct ctdb_client_message_multi_state *state;
 194         int i;
 195
 196         if (pnn_list == NULL || count == 0) {
 197                 return NULL;
 198         }
 199
 200         req = tevent_req_create(mem_ctx, &state,
 201                                 struct ctdb_client_message_multi_state);
 202         if (req == NULL) {
 203                 return NULL;
 204         }
 205
 206         state->pnn_list = pnn_list;
 207         state->count = count;
 208         state->done = 0;
 209         state->err = 0;
 210         state->err_list = talloc_zero_array(state, int, count);
 211         if (tevent_req_nomem(state->err_list, req)) {
 212                 return tevent_req_post(req, ev);
 213         }
 214
 215         for (i=0; i<count; i++) {
 216                 struct message_index_state *substate;
 217
 218                 subreq = ctdb_client_message_send(state, ev, client,
 219                                                   pnn_list[i], message);
 220                 if (tevent_req_nomem(subreq, req)) {
 221                         return tevent_req_post(req, ev);
 222                 }
 223
 224                 substate = talloc(subreq, struct message_index_state);
 225                 if (tevent_req_nomem(substate, req)) {
 226                         return tevent_req_post(req, ev);
 227                 }
 228
 229                 substate->req = req;
 230                 substate->index = i;
 231
 232                 tevent_req_set_callback(subreq, ctdb_client_message_multi_done,
 233                                         substate);
 234         }
 235
 236         return req;
 237 }
 238
 239 static void ctdb_client_message_multi_done(struct tevent_req *subreq)
 240 {
 241         struct message_index_state *substate = tevent_req_callback_data(
 242                 subreq, struct message_index_state);
 243         struct tevent_req *req = substate->req;
 244         int idx = substate->index;
 245         struct ctdb_client_message_multi_state *state = tevent_req_data(
 246                 req, struct ctdb_client_message_multi_state);
 247         bool status;
 248         int ret;
 249
 250         status = ctdb_client_message_recv(subreq, &ret);
 251         TALLOC_FREE(subreq);
 252         if (! status) {
 253                 if (state->err == 0) {
 254                         state->err = ret;
 255                         state->err_list[idx] = state->err;
 256                 }
 257         }
 258
 259         state->done += 1;
 260
 261         if (state->done == state->count) {
 262                 tevent_req_done(req);
 263         }
 264 }
 265
 266 bool ctdb_client_message_multi_recv(struct tevent_req *req, int *perr,
 267                                     TALLOC_CTX *mem_ctx, int **perr_list)
 268 {
 269         struct ctdb_client_message_multi_state *state = tevent_req_data(
 270                 req, struct ctdb_client_message_multi_state);
 271         int err;
 272
 273         if (tevent_req_is_unix_error(req, &err)) {
 274                 if (perr != NULL) {
 275                         *perr = err;
 276                 }
 277                 if (perr_list != NULL) {
 278                         *perr_list = talloc_steal(mem_ctx, state->err_list);
 279                 }
 280                 return false;
 281         }
 282
 283         if (perr != NULL) {
 284                 *perr = state->err;
 285         }
 286
 287         if (perr_list != NULL) {
 288                 *perr_list = talloc_steal(mem_ctx, state->err_list);
 289         }
 290
 291         if (state->err != 0) {
 292                 return false;
 293         }
 294
 295         return true;
 296 }
 297
 298 /*
 299  * sync version of message send
 300  */
 301
 302 int ctdb_client_message(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 303                         struct ctdb_client_context *client,
 304                         uint32_t destnode, struct ctdb_req_message *message)
 305 {
 306         TALLOC_CTX *tmp_ctx;
 307         struct tevent_req *req;
 308         int ret;
 309         bool status;
 310
 311         tmp_ctx = talloc_new(client);
 312         if (tmp_ctx == NULL) {
 313                 return ENOMEM;
 314         }
 315
 316         req = ctdb_client_message_send(tmp_ctx, ev, client, destnode, message);
 317         if (req == NULL) {
 318                 talloc_free(tmp_ctx);
 319                 return ENOMEM;
 320         }
 321
 322         tevent_req_poll(req, ev);
 323
 324         status = ctdb_client_message_recv(req, &ret);
 325         if (! status) {
 326                 talloc_free(tmp_ctx);
 327                 return ret;
 328         }
 329
 330         talloc_free(tmp_ctx);
 331         return 0;
 332 }
 333
 334 struct ctdb_client_set_message_handler_state {
 335         struct ctdb_client_context *client;
 336         uint64_t srvid;
 337         srvid_handler_fn handler;
 338         void *private_data;
 339 };
 340
 341 static void ctdb_client_set_message_handler_done(struct tevent_req *subreq);
 342
 343 struct tevent_req *ctdb_client_set_message_handler_send(
 344                                         TALLOC_CTX *mem_ctx,
 345                                         struct tevent_context *ev,
 346                                         struct ctdb_client_context *client,
 347                                         uint64_t srvid,
 348                                         srvid_handler_fn handler,
 349                                         void *private_data)
 350 {
 351         struct tevent_req *req, *subreq;
 352         struct ctdb_client_set_message_handler_state *state;
 353         struct ctdb_req_control request;
 354
 355         req = tevent_req_create(mem_ctx, &state,
 356                                 struct ctdb_client_set_message_handler_state);
 357         if (req == NULL) {
 358                 return NULL;
 359         }
 360
 361         state->client = client;
 362         state->srvid = srvid;
 363         state->handler = handler;
 364         state->private_data = private_data;
 365
 366         ctdb_req_control_register_srvid(&request, srvid);
 367         subreq = ctdb_client_control_send(state, ev, client, client->pnn,
 368                                           tevent_timeval_zero(), &request);
 369         if (tevent_req_nomem(subreq, req)) {
 370                 return tevent_req_post(req, ev);
 371         }
 372         tevent_req_set_callback(subreq, ctdb_client_set_message_handler_done,
 373                                 req);
 374
 375         return req;
 376 }
 377
 378 static void ctdb_client_set_message_handler_done(struct tevent_req *subreq)
 379 {
 380         struct tevent_req *req = tevent_req_callback_data(
 381                 subreq, struct tevent_req);
 382         struct ctdb_client_set_message_handler_state *state = tevent_req_data(
 383                 req, struct ctdb_client_set_message_handler_state);
 384         struct ctdb_reply_control *reply;
 385         bool status;
 386         int ret;
 387
 388         status = ctdb_client_control_recv(subreq, &ret, state, &reply);
 389         TALLOC_FREE(subreq);
 390         if (! status) {
 391                 tevent_req_error(req, ret);
 392                 return;
 393         }
 394
 395         ret = ctdb_reply_control_register_srvid(reply);
 396         talloc_free(reply);
 397         if (ret != 0) {
 398                 tevent_req_error(req, ret);
 399                 return;
 400         }
 401
 402         ret = srvid_register(state->client->srv, state->client, state->srvid,
 403                              state->handler, state->private_data);
 404         if (ret != 0) {
 405                 tevent_req_error(req, ret);
 406                 return;
 407         }
 408
 409         tevent_req_done(req);
 410 }
 411
 412 bool ctdb_client_set_message_handler_recv(struct tevent_req *req, int *perr)
 413 {
 414         int err;
 415
 416         if (tevent_req_is_unix_error(req, &err)) {
 417                 if (perr != NULL) {
 418                         *perr = err;
 419                 }
 420                 return false;
 421         }
 422         return true;
 423 }
 424
 425 struct ctdb_client_remove_message_handler_state {
 426         struct ctdb_client_context *client;
 427         uint64_t srvid;
 428         void *private_data;
 429 };
 430
 431 static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq);
 432
 433 struct tevent_req *ctdb_client_remove_message_handler_send(
 434                                         TALLOC_CTX *mem_ctx,
 435                                         struct tevent_context *ev,
 436                                         struct ctdb_client_context *client,
 437                                         uint64_t srvid,
 438                                         void *private_data)
 439 {
 440         struct tevent_req *req, *subreq;
 441         struct ctdb_client_remove_message_handler_state *state;
 442         struct ctdb_req_control request;
 443
 444         req = tevent_req_create(mem_ctx, &state,
 445                                 struct ctdb_client_remove_message_handler_state);
 446         if (req == NULL) {
 447                 return NULL;
 448         }
 449
 450         state->client = client;
 451         state->srvid = srvid;
 452         state->private_data = private_data;
 453
 454         ctdb_req_control_deregister_srvid(&request, srvid);
 455         subreq = ctdb_client_control_send(state, ev, client, client->pnn,
 456                                           tevent_timeval_zero(), &request);
 457         if (tevent_req_nomem(subreq, req)) {
 458                 return tevent_req_post(req, ev);
 459         }
 460         tevent_req_set_callback(subreq,
 461                                 ctdb_client_remove_message_handler_done, req);
 462
 463         return req;
 464 }
 465
 466 static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq)
 467 {
 468         struct tevent_req *req = tevent_req_callback_data(
 469                 subreq, struct tevent_req);
 470         struct ctdb_client_remove_message_handler_state *state = tevent_req_data(
 471                 req, struct ctdb_client_remove_message_handler_state);
 472         struct ctdb_reply_control *reply;
 473         bool status;
 474         int ret;
 475
 476         status = ctdb_client_control_recv(subreq, &ret, state, &reply);
 477         TALLOC_FREE(subreq);
 478         if (! status) {
 479                 tevent_req_error(req, ret);
 480                 return;
 481         }
 482
 483         ret = ctdb_reply_control_deregister_srvid(reply);
 484         talloc_free(reply);
 485         if (ret != 0) {
 486                 tevent_req_error(req, ret);
 487                 return;
 488         }
 489
 490         ret = srvid_deregister(state->client->srv, state->srvid,
 491                                state->private_data);
 492         if (ret != 0) {
 493                 tevent_req_error(req, ret);
 494                 return;
 495         }
 496
 497         tevent_req_done(req);
 498 }
 499
 500 bool ctdb_client_remove_message_handler_recv(struct tevent_req *req, int *perr)
 501 {
 502         int err;
 503
 504         if (tevent_req_is_unix_error(req, &err)) {
 505                 if (perr != NULL) {
 506                         *perr = err;
 507                 }
 508                 return false;
 509         }
 510         return true;
 511 }
 512
 513 int ctdb_client_set_message_handler(struct tevent_context *ev,
 514                                     struct ctdb_client_context *client,
 515                                     uint64_t srvid, srvid_handler_fn handler,
 516                                     void *private_data)
 517 {
 518         TALLOC_CTX *mem_ctx;
 519         int ret;
 520
 521         mem_ctx = talloc_new(client);
 522         if (mem_ctx == NULL) {
 523                 return ENOMEM;
 524         }
 525
 526         ret = ctdb_ctrl_register_srvid(mem_ctx, ev, client, client->pnn,
 527                                        tevent_timeval_zero(), srvid);
 528         talloc_free(mem_ctx);
 529         if (ret != 0) {
 530                 return ret;
 531         }
 532
 533         return srvid_register(client->srv, client, srvid,
 534                               handler, private_data);
 535 }
 536
 537 int ctdb_client_remove_message_handler(struct tevent_context *ev,
 538                                        struct ctdb_client_context *client,
 539                                        uint64_t srvid, void *private_data)
 540 {
 541         TALLOC_CTX *mem_ctx;
 542         int ret;
 543
 544         mem_ctx = talloc_new(client);
 545         if (mem_ctx == NULL) {
 546                 return ENOMEM;
 547         }
 548
 549         ret = ctdb_ctrl_deregister_srvid(mem_ctx, ev, client, client->pnn,
 550                                          tevent_timeval_zero(), srvid);
 551         talloc_free(mem_ctx);
 552         if (ret != 0) {
 553                 return ret;
 554         }
 555
 556         return srvid_deregister(client->srv, srvid, private_data);
 557 }