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