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 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
 103 static 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
 110 static 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
 127 bool 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
 141 void 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  * sync version of message send
 161  */
 162
 163 int ctdb_client_message(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 164                         struct ctdb_client_context *client,
 165                         uint32_t destnode, struct ctdb_req_message *message)
 166 {
 167         TALLOC_CTX *tmp_ctx;
 168         struct tevent_req *req;
 169         int ret;
 170         bool status;
 171
 172         tmp_ctx = talloc_new(client);
 173         if (tmp_ctx == NULL) {
 174                 return ENOMEM;
 175         }
 176
 177         req = ctdb_client_message_send(tmp_ctx, ev, client, destnode, message);
 178         if (req == NULL) {
 179                 talloc_free(tmp_ctx);
 180                 return ENOMEM;
 181         }
 182
 183         tevent_req_poll(req, ev);
 184
 185         status = ctdb_client_message_recv(req, &ret);
 186         if (! status) {
 187                 talloc_free(tmp_ctx);
 188                 return ret;
 189         }
 190
 191         talloc_free(tmp_ctx);
 192         return 0;
 193 }
 194
 195 struct ctdb_client_set_message_handler_state {
 196         struct ctdb_client_context *client;
 197         uint64_t srvid;
 198         srvid_handler_fn handler;
 199         void *private_data;
 200 };
 201
 202 static void ctdb_client_set_message_handler_done(struct tevent_req *subreq);
 203
 204 struct tevent_req *ctdb_client_set_message_handler_send(
 205                                         TALLOC_CTX *mem_ctx,
 206                                         struct tevent_context *ev,
 207                                         struct ctdb_client_context *client,
 208                                         uint64_t srvid,
 209                                         srvid_handler_fn handler,
 210                                         void *private_data)
 211 {
 212         struct tevent_req *req, *subreq;
 213         struct ctdb_client_set_message_handler_state *state;
 214         struct ctdb_req_control request;
 215
 216         req = tevent_req_create(mem_ctx, &state,
 217                                 struct ctdb_client_set_message_handler_state);
 218         if (req == NULL) {
 219                 return NULL;
 220         }
 221
 222         state->client = client;
 223         state->srvid = srvid;
 224         state->handler = handler;
 225         state->private_data = private_data;
 226
 227         ctdb_req_control_register_srvid(&request, srvid);
 228         subreq = ctdb_client_control_send(state, ev, client, client->pnn,
 229                                           tevent_timeval_zero(), &request);
 230         if (tevent_req_nomem(subreq, req)) {
 231                 return tevent_req_post(req, ev);
 232         }
 233         tevent_req_set_callback(subreq, ctdb_client_set_message_handler_done,
 234                                 req);
 235
 236         return req;
 237 }
 238
 239 static void ctdb_client_set_message_handler_done(struct tevent_req *subreq)
 240 {
 241         struct tevent_req *req = tevent_req_callback_data(
 242                 subreq, struct tevent_req);
 243         struct ctdb_client_set_message_handler_state *state = tevent_req_data(
 244                 req, struct ctdb_client_set_message_handler_state);
 245         struct ctdb_reply_control *reply;
 246         bool status;
 247         int ret;
 248
 249         status = ctdb_client_control_recv(subreq, &ret, state, &reply);
 250         TALLOC_FREE(subreq);
 251         if (! status) {
 252                 tevent_req_error(req, ret);
 253                 return;
 254         }
 255
 256         ret = ctdb_reply_control_register_srvid(reply);
 257         talloc_free(reply);
 258         if (ret != 0) {
 259                 tevent_req_error(req, ret);
 260                 return;
 261         }
 262
 263         ret = srvid_register(state->client->srv, state->client, state->srvid,
 264                              state->handler, state->private_data);
 265         if (ret != 0) {
 266                 tevent_req_error(req, ret);
 267                 return;
 268         }
 269
 270         tevent_req_done(req);
 271 }
 272
 273 bool ctdb_client_set_message_handler_recv(struct tevent_req *req, int *perr)
 274 {
 275         int err;
 276
 277         if (tevent_req_is_unix_error(req, &err)) {
 278                 if (perr != NULL) {
 279                         *perr = err;
 280                 }
 281                 return false;
 282         }
 283         return true;
 284 }
 285
 286 struct ctdb_client_remove_message_handler_state {
 287         struct ctdb_client_context *client;
 288         uint64_t srvid;
 289         void *private_data;
 290 };
 291
 292 static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq);
 293
 294 struct tevent_req *ctdb_client_remove_message_handler_send(
 295                                         TALLOC_CTX *mem_ctx,
 296                                         struct tevent_context *ev,
 297                                         struct ctdb_client_context *client,
 298                                         uint64_t srvid,
 299                                         void *private_data)
 300 {
 301         struct tevent_req *req, *subreq;
 302         struct ctdb_client_remove_message_handler_state *state;
 303         struct ctdb_req_control request;
 304
 305         req = tevent_req_create(mem_ctx, &state,
 306                                 struct ctdb_client_remove_message_handler_state);
 307         if (req == NULL) {
 308                 return NULL;
 309         }
 310
 311         state->client = client;
 312         state->srvid = srvid;
 313         state->private_data = private_data;
 314
 315         ctdb_req_control_deregister_srvid(&request, srvid);
 316         subreq = ctdb_client_control_send(state, ev, client, client->pnn,
 317                                           tevent_timeval_zero(), &request);
 318         if (tevent_req_nomem(subreq, req)) {
 319                 return tevent_req_post(req, ev);
 320         }
 321         tevent_req_set_callback(subreq,
 322                                 ctdb_client_remove_message_handler_done, req);
 323
 324         return req;
 325 }
 326
 327 static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq)
 328 {
 329         struct tevent_req *req = tevent_req_callback_data(
 330                 subreq, struct tevent_req);
 331         struct ctdb_client_remove_message_handler_state *state = tevent_req_data(
 332                 req, struct ctdb_client_remove_message_handler_state);
 333         struct ctdb_reply_control *reply;
 334         bool status;
 335         int ret;
 336
 337         status = ctdb_client_control_recv(subreq, &ret, state, &reply);
 338         TALLOC_FREE(subreq);
 339         if (! status) {
 340                 tevent_req_error(req, ret);
 341                 return;
 342         }
 343
 344         ret = ctdb_reply_control_deregister_srvid(reply);
 345         talloc_free(reply);
 346         if (ret != 0) {
 347                 tevent_req_error(req, ret);
 348                 return;
 349         }
 350
 351         ret = srvid_deregister(state->client->srv, state->srvid,
 352                                state->private_data);
 353         if (ret != 0) {
 354                 tevent_req_error(req, ret);
 355                 return;
 356         }
 357
 358         tevent_req_done(req);
 359 }
 360
 361 bool ctdb_client_remove_message_handler_recv(struct tevent_req *req, int *perr)
 362 {
 363         int err;
 364
 365         if (tevent_req_is_unix_error(req, &err)) {
 366                 if (perr != NULL) {
 367                         *perr = err;
 368                 }
 369                 return false;
 370         }
 371         return true;
 372 }
 373
 374 int ctdb_client_set_message_handler(TALLOC_CTX *mem_ctx,
 375                                     struct tevent_context *ev,
 376                                     struct ctdb_client_context *client,
 377                                     uint64_t srvid, srvid_handler_fn handler,
 378                                     void *private_data)
 379 {
 380         int ret;
 381
 382         ret = ctdb_ctrl_register_srvid(mem_ctx, ev, client, client->pnn,
 383                                        tevent_timeval_zero(), srvid);
 384         if (ret != 0) {
 385                 return ret;
 386         }
 387
 388         return srvid_register(client->srv, client, srvid,
 389                               handler, private_data);
 390 }
 391
 392 int ctdb_client_remove_message_handler(TALLOC_CTX *mem_ctx,
 393                                        struct tevent_context *ev,
 394                                        struct ctdb_client_context *client,
 395                                        uint64_t srvid, void *private_data)
 396 {
 397         int ret;
 398
 399         ret = ctdb_ctrl_deregister_srvid(mem_ctx, ev, client, client->pnn,
 400                                          tevent_timeval_zero(), srvid);
 401         if (ret != 0) {
 402                 return ret;
 403         }
 404
 405         return srvid_deregister(client->srv, srvid, private_data);
 406 }