ctdb/client/client_control.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_CONTROL and REPLY_CONTROL
  43  */
  44
  45 struct ctdb_client_control_state {
  46         struct ctdb_client_context *client;
  47         uint32_t opcode;
  48         uint32_t flags;
  49         uint32_t reqid;
  50         struct ctdb_reply_control *reply;
  51         struct tevent_req *req;
  52 };
  53
  54 static int ctdb_client_control_state_destructor(
  55         struct ctdb_client_control_state *state);
  56 static void ctdb_client_control_done(struct tevent_req *subreq);
  57
  58 struct tevent_req *ctdb_client_control_send(TALLOC_CTX *mem_ctx,
  59                                             struct tevent_context *ev,
  60                                             struct ctdb_client_context *client,
  61                                             uint32_t destnode,
  62                                             struct timeval timeout,
  63                                             struct ctdb_req_control *request)
  64 {
  65         struct ctdb_req_header h;
  66         struct tevent_req *req, *subreq;
  67         struct ctdb_client_control_state *state;
  68         uint32_t reqid;
  69         uint8_t *buf;
  70         size_t buflen;
  71         int ret;
  72
  73         req = tevent_req_create(mem_ctx, &state,
  74                                 struct ctdb_client_control_state);
  75         if (req == NULL) {
  76                 return NULL;
  77         }
  78
  79         reqid = reqid_new(client->idr, state);
  80         if (reqid == REQID_INVALID) {
  81                 talloc_free(req);
  82                 return NULL;
  83         }
  84
  85         state->client = client;
  86         state->flags = request->flags;
  87         state->opcode = request->opcode;
  88         state->reqid = reqid;
  89         state->req = req;
  90         state->reply = talloc_zero(state, struct ctdb_reply_control);
  91         if (tevent_req_nomem(state->reply, req)) {
  92                 return tevent_req_post(req, ev);
  93         }
  94
  95         talloc_set_destructor(state, ctdb_client_control_state_destructor);
  96
  97         ctdb_req_header_fill(&h, 0, CTDB_REQ_CONTROL, destnode,
  98                              client->pnn, reqid);
  99
 100         ret = ctdb_req_control_push(&h, request, state, &buf, &buflen);
 101         if (ret != 0) {
 102                 tevent_req_error(req, ret);
 103                 return tevent_req_post(req, ev);
 104         }
 105
 106         if (!tevent_timeval_is_zero(&timeout)) {
 107                 tevent_req_set_endtime(req, ev, timeout);
 108         }
 109
 110         subreq = comm_write_send(state, ev, client->comm, buf, buflen);
 111         if (tevent_req_nomem(subreq, req)) {
 112                 return tevent_req_post(req, ev);
 113         }
 114         tevent_req_set_callback(subreq, ctdb_client_control_done, req);
 115
 116         return req;
 117 }
 118
 119 static int ctdb_client_control_state_destructor(
 120         struct ctdb_client_control_state *state)
 121 {
 122         reqid_remove(state->client->idr, state->reqid);
 123         return 0;
 124 }
 125
 126 static void ctdb_client_control_done(struct tevent_req *subreq)
 127 {
 128         struct tevent_req *req = tevent_req_callback_data(
 129                 subreq, struct tevent_req);
 130         struct ctdb_client_control_state *state = tevent_req_data(
 131                 req, struct ctdb_client_control_state);
 132         bool status;
 133         int ret;
 134
 135         status = comm_write_recv(subreq, &ret);
 136         TALLOC_FREE(subreq);
 137         if (! status) {
 138                 tevent_req_error(req, ret);
 139                 return;
 140         }
 141
 142         /* Daemon will not reply, so we set status to 0 */
 143         if (state->flags & CTDB_CTRL_FLAG_NOREPLY) {
 144                 state->reply->status = 0;
 145                 tevent_req_done(req);
 146         }
 147
 148         /* wait for the reply or timeout */
 149 }
 150
 151 void ctdb_client_reply_control(struct ctdb_client_context *client,
 152                                uint8_t *buf, size_t buflen, uint32_t reqid)
 153 {
 154         struct ctdb_req_header h;
 155         struct ctdb_client_control_state *state;
 156         int ret;
 157
 158         state = reqid_find(client->idr, reqid,
 159                            struct ctdb_client_control_state);
 160         if (state == NULL) {
 161                 return;
 162         }
 163
 164         if (reqid != state->reqid) {
 165                 return;
 166         }
 167
 168         ret = ctdb_reply_control_pull(buf, buflen, state->opcode, &h,
 169                                       state->reply, state->reply);
 170         if (ret != 0) {
 171                 tevent_req_error(state->req, ret);
 172                 return;
 173         }
 174
 175         tevent_req_done(state->req);
 176 }
 177
 178 bool ctdb_client_control_recv(struct tevent_req *req, int *perr,
 179                               TALLOC_CTX *mem_ctx,
 180                               struct ctdb_reply_control **reply)
 181 {
 182         struct ctdb_client_control_state *state = tevent_req_data(
 183                 req, struct ctdb_client_control_state);
 184         int err;
 185
 186         if (tevent_req_is_unix_error(req, &err)) {
 187                 if (perr != NULL) {
 188                         *perr = err;
 189                 }
 190                 return false;
 191         }
 192
 193         if (reply != NULL) {
 194                 *reply = talloc_steal(mem_ctx, state->reply);
 195         }
 196
 197         return true;
 198 }
 199
 200 /*
 201  * Handle multiple nodes - there cannot be any return data
 202  */
 203
 204 struct ctdb_client_control_multi_state {
 205         uint32_t *pnn_list;
 206         int count;
 207         int done;
 208         int err;
 209         int *err_list;
 210         struct ctdb_reply_control **reply;
 211 };
 212
 213 struct control_index_state {
 214         struct tevent_req *req;
 215         int index;
 216 };
 217
 218 static void ctdb_client_control_multi_done(struct tevent_req *subreq);
 219
 220 struct tevent_req *ctdb_client_control_multi_send(
 221                                 TALLOC_CTX *mem_ctx,
 222                                 struct tevent_context *ev,
 223                                 struct ctdb_client_context *client,
 224                                 uint32_t *pnn_list, int count,
 225                                 struct timeval timeout,
 226                                 struct ctdb_req_control *request)
 227 {
 228         struct tevent_req *req, *subreq;
 229         struct ctdb_client_control_multi_state *state;
 230         int i;
 231
 232         if (pnn_list == NULL || count == 0) {
 233                 return NULL;
 234         }
 235
 236         req = tevent_req_create(mem_ctx, &state,
 237                                 struct ctdb_client_control_multi_state);
 238         if (req == NULL) {
 239                 return NULL;
 240         }
 241
 242         state->pnn_list = pnn_list;
 243         state->count = count;
 244         state->done = 0;
 245         state->err = 0;
 246         state->err_list = talloc_zero_array(state, int, count);
 247         if (tevent_req_nomem(state->err_list, req)) {
 248                 return tevent_req_post(req, ev);
 249         }
 250         state->reply = talloc_zero_array(state, struct ctdb_reply_control *,
 251                                          count);
 252         if (tevent_req_nomem(state->reply, req)) {
 253                 return tevent_req_post(req, ev);
 254         }
 255
 256         for (i=0; i<count; i++) {
 257                 struct control_index_state *substate;
 258
 259                 subreq = ctdb_client_control_send(state, ev, client,
 260                                                   pnn_list[i], timeout,
 261                                                   request);
 262                 if (tevent_req_nomem(subreq, req)) {
 263                         return tevent_req_post(req, ev);
 264                 }
 265
 266                 substate = talloc(subreq, struct control_index_state);
 267                 if (tevent_req_nomem(substate, req)) {
 268                         return tevent_req_post(req, ev);
 269                 }
 270
 271                 substate->req = req;
 272                 substate->index = i;
 273
 274                 tevent_req_set_callback(subreq, ctdb_client_control_multi_done,
 275                                         substate);
 276         }
 277
 278         return req;
 279 }
 280
 281 static void ctdb_client_control_multi_done(struct tevent_req *subreq)
 282 {
 283         struct control_index_state *substate = tevent_req_callback_data(
 284                 subreq, struct control_index_state);
 285         struct tevent_req *req = substate->req;
 286         int idx = substate->index;
 287         struct ctdb_client_control_multi_state *state = tevent_req_data(
 288                 req, struct ctdb_client_control_multi_state);
 289         bool status;
 290         int ret;
 291
 292         status = ctdb_client_control_recv(subreq, &ret, state->reply,
 293                                           &state->reply[idx]);
 294         TALLOC_FREE(subreq);
 295         if (! status) {
 296                 if (state->err == 0) {
 297                         state->err = ret;
 298                         state->err_list[idx] = state->err;
 299                 }
 300         } else {
 301                 if (state->reply[idx]->status != 0) {
 302                         if (state->err == 0) {
 303                                 state->err = state->reply[idx]->status;
 304                                 state->err_list[idx] = state->err;
 305                         }
 306                 }
 307         }
 308
 309         state->done += 1;
 310
 311         if (state->done == state->count) {
 312                 tevent_req_done(req);
 313         }
 314 }
 315
 316 bool ctdb_client_control_multi_recv(struct tevent_req *req, int *perr,
 317                                     TALLOC_CTX *mem_ctx, int **perr_list,
 318                                     struct ctdb_reply_control ***preply)
 319 {
 320         struct ctdb_client_control_multi_state *state = tevent_req_data(
 321                 req, struct ctdb_client_control_multi_state);
 322         int err;
 323
 324         if (tevent_req_is_unix_error(req, &err)) {
 325                 if (perr != NULL) {
 326                         *perr = err;
 327                 }
 328                 if (perr_list != NULL) {
 329                         *perr_list = talloc_steal(mem_ctx, state->err_list);
 330                 }
 331                 return false;
 332         }
 333
 334         if (perr != NULL) {
 335                 *perr = state->err;
 336         }
 337
 338         if (perr_list != NULL) {
 339                 *perr_list = talloc_steal(mem_ctx, state->err_list);
 340         }
 341
 342         if (preply != NULL) {
 343                 *preply = talloc_steal(mem_ctx, state->reply);
 344         }
 345
 346         if (state->err != 0) {
 347                 return false;
 348         }
 349
 350         return true;
 351 }
 352
 353 int ctdb_client_control_multi_error(uint32_t *pnn_list, int count,
 354                                     int *err_list, uint32_t *pnn)
 355 {
 356         int ret = 0, i;
 357
 358         for (i=0; i<count; i++) {
 359                 if (err_list[i] != 0) {
 360                         ret = err_list[i];
 361                         *pnn = pnn_list[i];
 362                 }
 363         }
 364
 365         return ret;
 366 }
 367
 368 /*
 369  * Sync version of control send/recv
 370  */
 371
 372 int ctdb_client_control(TALLOC_CTX *mem_ctx,
 373                         struct tevent_context *ev,
 374                         struct ctdb_client_context *client,
 375                         uint32_t destnode,
 376                         struct timeval timeout,
 377                         struct ctdb_req_control *request,
 378                         struct ctdb_reply_control **reply)
 379 {
 380         struct tevent_req *req;
 381         int ret;
 382         bool status;
 383
 384         req = ctdb_client_control_send(mem_ctx, ev, client, destnode, timeout,
 385                                        request);
 386         if (req == NULL) {
 387                 return ENOMEM;
 388         }
 389
 390         tevent_req_poll(req, ev);
 391
 392         status = ctdb_client_control_recv(req, &ret, mem_ctx, reply);
 393         if (! status) {
 394                 return ret;
 395         }
 396
 397         return 0;
 398 }
 399
 400 int ctdb_client_control_multi(TALLOC_CTX *mem_ctx,
 401                               struct tevent_context *ev,
 402                               struct ctdb_client_context *client,
 403                               uint32_t *pnn_list, int count,
 404                               struct timeval timeout,
 405                               struct ctdb_req_control *request,
 406                               int **perr_list,
 407                               struct ctdb_reply_control ***preply)
 408 {
 409         struct tevent_req *req;
 410         bool status;
 411         int ret;
 412
 413         req = ctdb_client_control_multi_send(mem_ctx, ev, client,
 414                                              pnn_list, count,
 415                                              timeout, request);
 416         if (req == NULL) {
 417                 return ENOMEM;
 418         }
 419
 420         tevent_req_poll(req, ev);
 421
 422         status = ctdb_client_control_multi_recv(req, &ret, mem_ctx, perr_list,
 423                                                 preply);
 424         if (! status) {
 425                 return ret;
 426         }
 427
 428         return 0;
 429 }