ctdb/event/event_cmd.c

   1 /*
   2    CTDB event daemon - command handling
   3
   4    Copyright (C) Amitay Isaacs  2018
   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
  22 #include <talloc.h>
  23 #include <tevent.h>
  24
  25 #include "lib/util/debug.h"
  26 #include "lib/util/tevent_unix.h"
  27
  28 #include "common/logging.h"
  29
  30 #include "event/event_private.h"
  31
  32 struct event_cmd_state {
  33         struct event_context *eventd;
  34         struct ctdb_event_request *request;
  35         struct ctdb_event_reply *reply;
  36 };
  37
  38 /*
  39  * CTDB_EVENT_CMD_RUN
  40  */
  41
  42 static void event_cmd_run_done(struct tevent_req *subreq);
  43
  44 static struct tevent_req *event_cmd_run_send(
  45                                 TALLOC_CTX *mem_ctx,
  46                                 struct tevent_context *ev,
  47                                 struct event_context *eventd,
  48                                 struct ctdb_event_request *request,
  49                                 struct ctdb_event_reply *reply)
  50 {
  51         struct tevent_req *req, *subreq;
  52         struct event_cmd_state *state;
  53         struct run_event_context *run_ctx;
  54         struct ctdb_event_request_run *rdata;
  55         int ret;
  56         bool continue_on_failure = false;
  57
  58         req = tevent_req_create(mem_ctx, &state, struct event_cmd_state);
  59         if (req == NULL) {
  60                 return NULL;
  61         }
  62
  63         state->eventd = eventd;
  64         state->request = request;
  65         state->reply = reply;
  66
  67         rdata = request->data.run;
  68
  69         ret = eventd_run_ctx(eventd, rdata->component, &run_ctx);
  70         if (ret != 0) {
  71                 state->reply->result = ret;
  72                 tevent_req_done(req);
  73                 return tevent_req_post(req, ev);
  74         }
  75
  76         if (rdata->flags & CTDB_EVENT_RUN_ALL) {
  77                 continue_on_failure = true;
  78         }
  79
  80         subreq = run_event_send(state,
  81                                 ev,
  82                                 run_ctx,
  83                                 rdata->event,
  84                                 rdata->args,
  85                                 tevent_timeval_current_ofs(rdata->timeout,0),
  86                                 continue_on_failure);
  87         if (tevent_req_nomem(subreq, req)) {
  88                 return tevent_req_post(req, ev);
  89         }
  90         tevent_req_set_callback(subreq, event_cmd_run_done, req);
  91
  92         return req;
  93 }
  94
  95 static void event_cmd_run_done(struct tevent_req *subreq)
  96 {
  97         struct tevent_req *req = tevent_req_callback_data(
  98                 subreq, struct tevent_req);
  99         struct event_cmd_state *state = tevent_req_data(
 100                 req, struct event_cmd_state);
 101         struct run_event_script_list *script_list = NULL;
 102         struct ctdb_event_request_run *rdata;
 103         int ret;
 104         bool ok;
 105
 106         ok = run_event_recv(subreq, &ret, state, &script_list);
 107         TALLOC_FREE(subreq);
 108         if (!ok) {
 109                 state->reply->result = ret;
 110                 goto done;
 111         }
 112
 113         if (script_list == NULL) {
 114                 state->reply->result = EIO;
 115                 goto done;
 116         }
 117
 118         if (script_list->summary == -ECANCELED) {
 119                 state->reply->result = ECANCELED;
 120                 goto done;
 121         }
 122
 123         rdata = state->request->data.run;
 124         ret = eventd_set_event_result(state->eventd,
 125                                       rdata->component,
 126                                       rdata->event,
 127                                       script_list);
 128         if (ret != 0) {
 129                 state->reply->result = ret;
 130                 goto done;
 131         }
 132
 133         if (script_list->summary == -ETIMEDOUT) {
 134                 state->reply->result = ETIMEDOUT;
 135         } else if (script_list->summary != 0) {
 136                 state->reply->result = ENOEXEC;
 137         }
 138
 139 done:
 140         tevent_req_done(req);
 141 }
 142
 143 /*
 144  * CTDB_EVENT_CMD_STATUS
 145  */
 146
 147 static struct tevent_req *event_cmd_status_send(
 148                                 TALLOC_CTX *mem_ctx,
 149                                 struct tevent_context *ev,
 150                                 struct event_context *eventd,
 151                                 struct ctdb_event_request *request,
 152                                 struct ctdb_event_reply *reply)
 153 {
 154         struct tevent_req *req;
 155         struct event_cmd_state *state;
 156         struct ctdb_event_request_run *rdata;
 157         struct run_event_script_list *script_list;
 158         int ret;
 159
 160         req = tevent_req_create(mem_ctx, &state, struct event_cmd_state);
 161         if (req == NULL) {
 162                 return NULL;
 163         }
 164
 165         reply->data.status = talloc_zero(reply,
 166                                          struct ctdb_event_reply_status);
 167         if (tevent_req_nomem(reply->data.status, req)) {
 168                 reply->result = ENOMEM;
 169                 goto done;
 170         }
 171
 172         rdata = request->data.run;
 173
 174         ret = eventd_get_event_result(eventd,
 175                                       rdata->component,
 176                                       rdata->event,
 177                                       &script_list);
 178         if (ret != 0) {
 179                 reply->result = ret;
 180                 goto done;
 181         }
 182
 183         reply->data.status->script_list = eventd_script_list(reply,
 184                                                              script_list);
 185         if (reply->data.status->script_list == NULL) {
 186                 reply->result = ENOMEM;
 187                 goto done;
 188         }
 189         reply->data.status->summary = script_list->summary;
 190
 191         reply->result = 0;
 192
 193 done:
 194         tevent_req_done(req);
 195         return tevent_req_post(req, ev);
 196 }
 197
 198 /*
 199  * CTDB_EVENT_CMD_SCRIPT
 200  */
 201
 202 static struct tevent_req *event_cmd_script_send(
 203                                 TALLOC_CTX *mem_ctx,
 204                                 struct tevent_context *ev,
 205                                 struct event_context *eventd,
 206                                 struct ctdb_event_request *request,
 207                                 struct ctdb_event_reply *reply)
 208 {
 209         struct tevent_req *req;
 210         struct event_cmd_state *state;
 211         struct run_event_context *run_ctx;
 212         struct ctdb_event_request_script *rdata;
 213         int ret;
 214
 215         req = tevent_req_create(mem_ctx, &state, struct event_cmd_state);
 216         if (req == NULL) {
 217                 return NULL;
 218         }
 219
 220         rdata = request->data.script;
 221
 222         ret = eventd_run_ctx(eventd, rdata->component, &run_ctx);
 223         if (ret != 0) {
 224                 reply->result = ret;
 225                 goto done;
 226         }
 227
 228         if (rdata->action == CTDB_EVENT_SCRIPT_DISABLE) {
 229                 ret = run_event_script_disable(run_ctx, rdata->script);
 230         } else if (rdata->action == CTDB_EVENT_SCRIPT_ENABLE) {
 231                 ret = run_event_script_enable(run_ctx, rdata->script);
 232         } else {
 233                 D_ERR("Invalid action specified\n");
 234                 reply->result = EPROTO;
 235                 goto done;
 236         }
 237
 238         if (ret != 0) {
 239                 reply->result = ret;
 240                 goto done;
 241         }
 242
 243         reply->result = 0;
 244
 245 done:
 246         tevent_req_done(req);
 247         return tevent_req_post(req, ev);
 248 }
 249
 250 static bool event_cmd_recv(struct tevent_req *req, int *perr)
 251 {
 252         if (tevent_req_is_unix_error(req, perr)) {
 253                 return false;
 254         }
 255
 256         return true;
 257 }
 258
 259
 260 struct event_cmd_dispatch_state {
 261         struct ctdb_event_reply *reply;
 262 };
 263
 264 static void event_cmd_dispatch_done(struct tevent_req *subreq);
 265
 266 struct tevent_req *event_cmd_dispatch_send(TALLOC_CTX *mem_ctx,
 267                                            struct tevent_context *ev,
 268                                            struct event_context *eventd,
 269                                            struct ctdb_event_request *request)
 270 {
 271         struct tevent_req *req, *subreq;
 272         struct event_cmd_dispatch_state *state;
 273
 274         req = tevent_req_create(mem_ctx,
 275                                 &state,
 276                                 struct event_cmd_dispatch_state);
 277         if (req == NULL) {
 278                 return NULL;
 279         }
 280
 281         state->reply = talloc_zero(state, struct ctdb_event_reply);
 282         if (tevent_req_nomem(state->reply, req)) {
 283                 return tevent_req_post(req, ev);
 284         }
 285
 286         state->reply->cmd = request->cmd;
 287
 288         switch (request->cmd) {
 289         case CTDB_EVENT_CMD_RUN:
 290                 subreq = event_cmd_run_send(state,
 291                                             ev,
 292                                             eventd,
 293                                             request,
 294                                             state->reply);
 295                 break;
 296
 297         case CTDB_EVENT_CMD_STATUS:
 298                 subreq = event_cmd_status_send(state,
 299                                                ev,
 300                                                eventd,
 301                                                request,
 302                                                state->reply);
 303                 break;
 304
 305         case CTDB_EVENT_CMD_SCRIPT:
 306                 subreq = event_cmd_script_send(state,
 307                                                ev,
 308                                                eventd,
 309                                                request,
 310                                                state->reply);
 311                 break;
 312
 313         default:
 314                 state->reply->result = EPROTO;
 315                 tevent_req_done(req);
 316                 return tevent_req_post(req, ev);
 317         }
 318
 319         if (tevent_req_nomem(subreq, req)) {
 320                 return tevent_req_post(req, ev);
 321         }
 322         tevent_req_set_callback(subreq, event_cmd_dispatch_done, req);
 323
 324         return req;
 325 }
 326
 327 static void event_cmd_dispatch_done(struct tevent_req *subreq)
 328 {
 329         struct tevent_req *req = tevent_req_callback_data(
 330                 subreq, struct tevent_req);
 331         int ret;
 332         bool ok;
 333
 334         ok = event_cmd_recv(subreq, &ret);
 335         TALLOC_FREE(subreq);
 336         if (!ok) {
 337                 tevent_req_error(req, ret);
 338                 return;
 339         }
 340
 341         tevent_req_done(req);
 342 }
 343
 344 bool event_cmd_dispatch_recv(struct tevent_req *req,
 345                              int *perr,
 346                              TALLOC_CTX *mem_ctx,
 347                              struct ctdb_event_reply **reply)
 348 {
 349         struct event_cmd_dispatch_state *state = tevent_req_data(
 350                 req, struct event_cmd_dispatch_state);
 351
 352         if (tevent_req_is_unix_error(req, perr)) {
 353                 return false;
 354         }
 355
 356         *reply = talloc_steal(mem_ctx, state->reply);
 357         return true;
 358 }