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 datalen, 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         state->reply->rdata.opcode = request->rdata.opcode;
  95
  96         talloc_set_destructor(state, ctdb_client_control_state_destructor);
  97
  98         ctdb_req_header_fill(&h, 0, CTDB_REQ_CONTROL, destnode,
  99                              client->pnn, reqid);
 100
 101         datalen = ctdb_req_control_len(&h, request);
 102         ret = ctdb_allocate_pkt(state, datalen, &buf, &buflen);
 103         if (ret != 0) {
 104                 tevent_req_error(req, ret);
 105                 return tevent_req_post(req, ev);
 106         }
 107
 108         ret = ctdb_req_control_push(&h, request, buf, &buflen);
 109         if (ret != 0) {
 110                 tevent_req_error(req, ret);
 111                 return tevent_req_post(req, ev);
 112         }
 113
 114         if (!tevent_timeval_is_zero(&timeout)) {
 115                 tevent_req_set_endtime(req, ev, timeout);
 116         }
 117
 118         subreq = comm_write_send(state, ev, client->comm, buf, buflen);
 119         if (tevent_req_nomem(subreq, req)) {
 120                 return tevent_req_post(req, ev);
 121         }
 122         tevent_req_set_callback(subreq, ctdb_client_control_done, req);
 123
 124         return req;
 125 }
 126
 127 static int ctdb_client_control_state_destructor(
 128         struct ctdb_client_control_state *state)
 129 {
 130         reqid_remove(state->client->idr, state->reqid);
 131         return 0;
 132 }
 133
 134 static void ctdb_client_control_done(struct tevent_req *subreq)
 135 {
 136         struct tevent_req *req = tevent_req_callback_data(
 137                 subreq, struct tevent_req);
 138         struct ctdb_client_control_state *state = tevent_req_data(
 139                 req, struct ctdb_client_control_state);
 140         bool status;
 141         int ret;
 142
 143         status = comm_write_recv(subreq, &ret);
 144         TALLOC_FREE(subreq);
 145         if (! status) {
 146                 tevent_req_error(req, ret);
 147                 return;
 148         }
 149
 150         /* Daemon will not reply, so we set status to 0 */
 151         if (state->flags & CTDB_CTRL_FLAG_NOREPLY) {
 152                 state->reply->status = 0;
 153                 tevent_req_done(req);
 154         }
 155
 156         /* wait for the reply or timeout */
 157 }
 158
 159 void ctdb_client_reply_control(struct ctdb_client_context *client,
 160                                uint8_t *buf, size_t buflen, uint32_t reqid)
 161 {
 162         struct ctdb_req_header h;
 163         struct ctdb_client_control_state *state;
 164         int ret;
 165
 166         state = reqid_find(client->idr, reqid,
 167                            struct ctdb_client_control_state);
 168         if (state == NULL) {
 169                 return;
 170         }
 171
 172         if (reqid != state->reqid) {
 173                 return;
 174         }
 175
 176         ret = ctdb_reply_control_pull(buf, buflen, state->opcode, &h,
 177                                       state->reply, state->reply);
 178         if (ret != 0) {
 179                 tevent_req_error(state->req, ret);
 180                 return;
 181         }
 182
 183         tevent_req_done(state->req);
 184 }
 185
 186 bool ctdb_client_control_recv(struct tevent_req *req, int *perr,
 187                               TALLOC_CTX *mem_ctx,
 188                               struct ctdb_reply_control **reply)
 189 {
 190         struct ctdb_client_control_state *state = tevent_req_data(
 191                 req, struct ctdb_client_control_state);
 192         int err;
 193
 194         if (tevent_req_is_unix_error(req, &err)) {
 195                 if (perr != NULL) {
 196                         *perr = err;
 197                 }
 198                 return false;
 199         }
 200
 201         if (reply != NULL) {
 202                 *reply = talloc_steal(mem_ctx, state->reply);
 203         }
 204
 205         return true;
 206 }
 207
 208 /*
 209  * Handle multiple nodes - there cannot be any return data
 210  */
 211
 212 struct ctdb_client_control_multi_state {
 213         uint32_t *pnn_list;
 214         int count;
 215         int done;
 216         int err;
 217         int *err_list;
 218         struct ctdb_reply_control **reply;
 219 };
 220
 221 struct control_index_state {
 222         struct tevent_req *req;
 223         int index;
 224 };
 225
 226 static void ctdb_client_control_multi_done(struct tevent_req *subreq);
 227
 228 struct tevent_req *ctdb_client_control_multi_send(
 229                                 TALLOC_CTX *mem_ctx,
 230                                 struct tevent_context *ev,
 231                                 struct ctdb_client_context *client,
 232                                 uint32_t *pnn_list, int count,
 233                                 struct timeval timeout,
 234                                 struct ctdb_req_control *request)
 235 {
 236         struct tevent_req *req, *subreq;
 237         struct ctdb_client_control_multi_state *state;
 238         int i;
 239
 240         if (pnn_list == NULL || count == 0) {
 241                 return NULL;
 242         }
 243
 244         req = tevent_req_create(mem_ctx, &state,
 245                                 struct ctdb_client_control_multi_state);
 246         if (req == NULL) {
 247                 return NULL;
 248         }
 249
 250         state->pnn_list = pnn_list;
 251         state->count = count;
 252         state->done = 0;
 253         state->err = 0;
 254         state->err_list = talloc_zero_array(state, int, count);
 255         if (tevent_req_nomem(state->err_list, req)) {
 256                 return tevent_req_post(req, ev);
 257         }
 258         state->reply = talloc_zero_array(state, struct ctdb_reply_control *,
 259                                          count);
 260         if (tevent_req_nomem(state->reply, req)) {
 261                 return tevent_req_post(req, ev);
 262         }
 263
 264         for (i=0; i<count; i++) {
 265                 struct control_index_state *substate;
 266
 267                 subreq = ctdb_client_control_send(state, ev, client,
 268                                                   pnn_list[i], timeout,
 269                                                   request);
 270                 if (tevent_req_nomem(subreq, req)) {
 271                         return tevent_req_post(req, ev);
 272                 }
 273
 274                 substate = talloc(subreq, struct control_index_state);
 275                 if (tevent_req_nomem(substate, req)) {
 276                         return tevent_req_post(req, ev);
 277                 }
 278
 279                 substate->req = req;
 280                 substate->index = i;
 281
 282                 tevent_req_set_callback(subreq, ctdb_client_control_multi_done,
 283                                         substate);
 284         }
 285
 286         return req;
 287 }
 288
 289 static void ctdb_client_control_multi_done(struct tevent_req *subreq)
 290 {
 291         struct control_index_state *substate = tevent_req_callback_data(
 292                 subreq, struct control_index_state);
 293         struct tevent_req *req = substate->req;
 294         int idx = substate->index;
 295         struct ctdb_client_control_multi_state *state = tevent_req_data(
 296                 req, struct ctdb_client_control_multi_state);
 297         bool status;
 298         int ret;
 299
 300         status = ctdb_client_control_recv(subreq, &ret, state->reply,
 301                                           &state->reply[idx]);
 302         TALLOC_FREE(subreq);
 303         if (! status) {
 304                 if (state->err == 0) {
 305                         state->err = ret;
 306                         state->err_list[idx] = state->err;
 307                 }
 308         } else {
 309                 if (state->reply[idx]->status != 0) {
 310                         if (state->err == 0) {
 311                                 state->err = state->reply[idx]->status;
 312                                 state->err_list[idx] = state->err;
 313                         }
 314                 }
 315         }
 316
 317         state->done += 1;
 318
 319         if (state->done == state->count) {
 320                 tevent_req_done(req);
 321         }
 322 }
 323
 324 bool ctdb_client_control_multi_recv(struct tevent_req *req, int *perr,
 325                                     TALLOC_CTX *mem_ctx, int **perr_list,
 326                                     struct ctdb_reply_control ***preply)
 327 {
 328         struct ctdb_client_control_multi_state *state = tevent_req_data(
 329                 req, struct ctdb_client_control_multi_state);
 330         int err;
 331
 332         if (tevent_req_is_unix_error(req, &err)) {
 333                 if (perr != NULL) {
 334                         *perr = err;
 335                 }
 336                 if (perr_list != NULL) {
 337                         *perr_list = talloc_steal(mem_ctx, state->err_list);
 338                 }
 339                 return false;
 340         }
 341
 342         if (perr != NULL) {
 343                 *perr = state->err;
 344         }
 345
 346         if (perr_list != NULL) {
 347                 *perr_list = talloc_steal(mem_ctx, state->err_list);
 348         }
 349
 350         if (preply != NULL) {
 351                 *preply = talloc_steal(mem_ctx, state->reply);
 352         }
 353
 354         if (state->err != 0) {
 355                 return false;
 356         }
 357
 358         return true;
 359 }
 360
 361 int ctdb_client_control_multi_error(uint32_t *pnn_list, int count,
 362                                     int *err_list, uint32_t *pnn)
 363 {
 364         int ret = 0, i;
 365
 366         for (i=0; i<count; i++) {
 367                 if (err_list[i] != 0) {
 368                         ret = err_list[i];
 369                         *pnn = pnn_list[i];
 370                 }
 371         }
 372
 373         return ret;
 374 }
 375
 376 /*
 377  * Sync version of control send/recv
 378  */
 379
 380 int ctdb_client_control(TALLOC_CTX *mem_ctx,
 381                         struct tevent_context *ev,
 382                         struct ctdb_client_context *client,
 383                         uint32_t destnode,
 384                         struct timeval timeout,
 385                         struct ctdb_req_control *request,
 386                         struct ctdb_reply_control **reply)
 387 {
 388         struct tevent_req *req;
 389         int ret;
 390         bool status;
 391
 392         req = ctdb_client_control_send(mem_ctx, ev, client, destnode, timeout,
 393                                        request);
 394         if (req == NULL) {
 395                 return ENOMEM;
 396         }
 397
 398         tevent_req_poll(req, ev);
 399
 400         status = ctdb_client_control_recv(req, &ret, mem_ctx, reply);
 401         if (! status) {
 402                 return ret;
 403         }
 404
 405         return 0;
 406 }
 407
 408 int ctdb_client_control_multi(TALLOC_CTX *mem_ctx,
 409                               struct tevent_context *ev,
 410                               struct ctdb_client_context *client,
 411                               uint32_t *pnn_list, int count,
 412                               struct timeval timeout,
 413                               struct ctdb_req_control *request,
 414                               int **perr_list,
 415                               struct ctdb_reply_control ***preply)
 416 {
 417         struct tevent_req *req;
 418         bool status;
 419         int ret;
 420
 421         req = ctdb_client_control_multi_send(mem_ctx, ev, client,
 422                                              pnn_list, count,
 423                                              timeout, request);
 424         if (req == NULL) {
 425                 return ENOMEM;
 426         }
 427
 428         tevent_req_poll(req, ev);
 429
 430         status = ctdb_client_control_multi_recv(req, &ret, mem_ctx, perr_list,
 431                                                 preply);
 432         if (! status) {
 433                 return ret;
 434         }
 435
 436         return 0;
 437 }