daemons/controld/controld

/* */
This source file includes following definitions.
controld_shutdown_schedulerd_ipc
save_cib_contents
handle_disconnect
handle_reply
scheduler_event_callback
new_schedulerd_ipc_connection
do_pe_control
controld_sched_timeout
controld_stop_sched_timer
controld_expect_sched_reply
controld_free_sched_timer
do_pe_invoke
force_local_option
do_pe_invoke_callback
   1 /*
   2  * Copyright 2004-2021 the Pacemaker project contributors
   3  *
   4  * The version control history for this file may have further details.
   5  *
   6  * This source code is licensed under the GNU General Public License version 2
   7  * or later (GPLv2+) WITHOUT ANY WARRANTY.
   8  */
   9 
  10 #include <crm_internal.h>
  11 
  12 #include <unistd.h>  /* pid_t, sleep, ssize_t */
  13 
  14 #include <crm/cib.h>
  15 #include <crm/cluster.h>
  16 #include <crm/common/xml.h>
  17 #include <crm/crm.h>
  18 #include <crm/msg_xml.h>
  19 #include <crm/common/xml_internal.h>
  20 #include <crm/common/ipc.h>
  21 #include <crm/common/ipc_schedulerd.h>
  22 
  23 #include <pacemaker-controld.h>
  24 
  25 static void handle_disconnect(void);
  26 
  27 static pcmk_ipc_api_t *schedulerd_api = NULL;
  28 
  29 /*!
  30  * \internal
  31  * \brief Close any scheduler connection and free associated memory
  32  */
  33 void
  34 controld_shutdown_schedulerd_ipc(void)
     /*  */
  35 {
  36     controld_clear_fsa_input_flags(R_PE_REQUIRED);
  37     pcmk_disconnect_ipc(schedulerd_api);
  38     handle_disconnect();
  39 
  40     pcmk_free_ipc_api(schedulerd_api);
  41     schedulerd_api = NULL;
  42 }
  43 
  44 /*!
  45  * \internal
  46  * \brief Save CIB query result to file, raising FSA error
  47  *
  48  * \param[in] msg        Ignored
  49  * \param[in] call_id    Call ID of CIB query
  50  * \param[in] rc         Return code of CIB query
  51  * \param[in] output     Result of CIB query
  52  * \param[in] user_data  Unique identifier for filename (will be freed)
  53  *
  54  * \note This is intended to be called after a scheduler connection fails.
  55  */
  56 static void
  57 save_cib_contents(xmlNode *msg, int call_id, int rc, xmlNode *output,
     /*  */
  58                   void *user_data)
  59 {
  60     char *id = user_data;
  61 
  62     register_fsa_error_adv(C_FSA_INTERNAL, I_ERROR, NULL, NULL, __func__);
  63     CRM_CHECK(id != NULL, return);
  64 
  65     if (rc == pcmk_ok) {
  66         char *filename = crm_strdup_printf(PE_STATE_DIR "/pe-core-%s.bz2", id);
  67 
  68         if (write_xml_file(output, filename, TRUE) < 0) {
  69             crm_err("Could not save Cluster Information Base to %s after scheduler crash",
  70                     filename);
  71         } else {
  72             crm_notice("Saved Cluster Information Base to %s after scheduler crash",
  73                        filename);
  74         }
  75         free(filename);
  76     }
  77 }
  78 
  79 /*!
  80  * \internal
  81  * \brief Respond to scheduler connection failure
  82  */
  83 static void
  84 handle_disconnect(void)
     /*  */
  85 {
  86     // If we aren't connected to the scheduler, we can't expect a reply
  87     controld_expect_sched_reply(NULL);
  88 
  89     if (pcmk_is_set(fsa_input_register, R_PE_REQUIRED)) {
  90         int rc = pcmk_ok;
  91         char *uuid_str = crm_generate_uuid();
  92 
  93         crm_crit("Connection to the scheduler failed "
  94                  CRM_XS " uuid=%s", uuid_str);
  95 
  96         /*
  97          * The scheduler died...
  98          *
  99          * Save the current CIB so that we have a chance of
 100          * figuring out what killed it.
 101          *
 102          * Delay raising the I_ERROR until the query below completes or
 103          * 5s is up, whichever comes first.
 104          *
 105          */
 106         rc = fsa_cib_conn->cmds->query(fsa_cib_conn, NULL, NULL, cib_scope_local);
 107         fsa_register_cib_callback(rc, FALSE, uuid_str, save_cib_contents);
 108 
 109     } else {
 110         crm_info("Connection to the scheduler released");
 111     }
 112 
 113     controld_clear_fsa_input_flags(R_PE_CONNECTED);
 114     mainloop_set_trigger(fsa_source);
 115     return;
 116 }
 117 
 118 static void
 119 handle_reply(pcmk_schedulerd_api_reply_t *reply)
     /*  */
 120 {
 121     const char *msg_ref = NULL;
 122 
 123     if (!AM_I_DC) {
 124         return;
 125     }
 126 
 127     msg_ref = reply->data.graph.reference;
 128 
 129     if (msg_ref == NULL) {
 130         crm_err("%s - Ignoring calculation with no reference", CRM_OP_PECALC);
 131 
 132     } else if (pcmk__str_eq(msg_ref, fsa_pe_ref, pcmk__str_none)) {
 133         ha_msg_input_t fsa_input;
 134         xmlNode *crm_data_node;
 135 
 136         controld_stop_sched_timer();
 137 
 138         /* do_te_invoke (which will eventually process the fsa_input we are constructing
 139          * here) requires that fsa_input.xml be non-NULL.  That will only happen if
 140          * copy_ha_msg_input (which is called by register_fsa_input_adv) sees the
 141          * fsa_input.msg that it is expecting. The scheduler's IPC dispatch function
 142          * gave us the values we need, we just need to put them into XML.
 143          *
 144          * The name of the top level element here is irrelevant.  Nothing checks it.
 145          */
 146         fsa_input.msg = create_xml_node(NULL, "dummy-reply");
 147         crm_xml_add(fsa_input.msg, XML_ATTR_REFERENCE, msg_ref);
 148         crm_xml_add(fsa_input.msg, F_CRM_TGRAPH_INPUT, reply->data.graph.input);
 149 
 150         crm_data_node = create_xml_node(fsa_input.msg, F_CRM_DATA);
 151         add_node_copy(crm_data_node, reply->data.graph.tgraph);
 152         register_fsa_input_later(C_IPC_MESSAGE, I_PE_SUCCESS, &fsa_input);
 153 
 154         free_xml(fsa_input.msg);
 155 
 156     } else {
 157         crm_info("%s calculation %s is obsolete", CRM_OP_PECALC, msg_ref);
 158     }
 159 }
 160 
 161 static void
 162 scheduler_event_callback(pcmk_ipc_api_t *api, enum pcmk_ipc_event event_type,
     /*  */
 163                          crm_exit_t status, void *event_data, void *user_data)
 164 {
 165     pcmk_schedulerd_api_reply_t *reply = event_data;
 166 
 167     switch (event_type) {
 168         case pcmk_ipc_event_disconnect:
 169             handle_disconnect();
 170             break;
 171 
 172         case pcmk_ipc_event_reply:
 173             handle_reply(reply);
 174             break;
 175 
 176         default:
 177             break;
 178     }
 179 }
 180 
 181 static bool
 182 new_schedulerd_ipc_connection(void)
     /*  */
 183 {
 184     int rc;
 185 
 186     controld_set_fsa_input_flags(R_PE_REQUIRED);
 187 
 188     if (schedulerd_api == NULL) {
 189         rc = pcmk_new_ipc_api(&schedulerd_api, pcmk_ipc_schedulerd);
 190 
 191         if (rc != pcmk_rc_ok) {
 192             crm_err("Error connecting to the scheduler: %s", pcmk_rc_str(rc));
 193             return false;
 194         }
 195     }
 196 
 197     pcmk_register_ipc_callback(schedulerd_api, scheduler_event_callback, NULL);
 198 
 199     rc = pcmk_connect_ipc(schedulerd_api, pcmk_ipc_dispatch_main);
 200     if (rc != pcmk_rc_ok) {
 201         crm_err("Error connecting to the scheduler: %s", pcmk_rc_str(rc));
 202         return false;
 203     }
 204 
 205     controld_set_fsa_input_flags(R_PE_CONNECTED);
 206     return true;
 207 }
 208 
 209 static void do_pe_invoke_callback(xmlNode *msg, int call_id, int rc,
 210                                   xmlNode *output, void *user_data);
 211 
 212 /*       A_PE_START, A_PE_STOP, O_PE_RESTART    */
 213 void
 214 do_pe_control(long long action,
     /*  */
 215               enum crmd_fsa_cause cause,
 216               enum crmd_fsa_state cur_state,
 217               enum crmd_fsa_input current_input, fsa_data_t * msg_data)
 218 {
 219     if (action & A_PE_STOP) {
 220         controld_clear_fsa_input_flags(R_PE_REQUIRED);
 221         pcmk_disconnect_ipc(schedulerd_api);
 222         handle_disconnect();
 223     }
 224     if ((action & A_PE_START)
 225         && !pcmk_is_set(fsa_input_register, R_PE_CONNECTED)) {
 226 
 227         if (cur_state == S_STOPPING) {
 228             crm_info("Ignoring request to connect to scheduler while shutting down");
 229 
 230         } else if (!new_schedulerd_ipc_connection()) {
 231             crm_warn("Could not connect to scheduler");
 232             register_fsa_error(C_FSA_INTERNAL, I_FAIL, NULL);
 233         }
 234     }
 235 }
 236 
 237 int fsa_pe_query = 0;
 238 char *fsa_pe_ref = NULL;
 239 static mainloop_timer_t *controld_sched_timer = NULL;
 240 
 241 // @TODO Make this a configurable cluster option if there's demand for it
 242 #define SCHED_TIMEOUT_MS (120000)
 243 
 244 /*!
 245  * \internal
 246  * \brief Handle a timeout waiting for scheduler reply
 247  *
 248  * \param[in] user_data  Ignored
 249  *
 250  * \return FALSE (indicating that timer should not be restarted)
 251  */
 252 static gboolean
 253 controld_sched_timeout(gpointer user_data)
     /*  */
 254 {
 255     if (AM_I_DC) {
 256         /* If this node is the DC but can't communicate with the scheduler, just
 257          * exit (and likely get fenced) so this node doesn't interfere with any
 258          * further DC elections.
 259          *
 260          * @TODO We could try something less drastic first, like disconnecting
 261          * and reconnecting to the scheduler, but something is likely going
 262          * seriously wrong, so perhaps it's better to just fail as quickly as
 263          * possible.
 264          */
 265         crmd_exit(CRM_EX_FATAL);
 266     }
 267     return FALSE;
 268 }
 269 
 270 void
 271 controld_stop_sched_timer(void)
     /*  */
 272 {
 273     if (controld_sched_timer && fsa_pe_ref) {
 274         crm_trace("Stopping timer for scheduler reply %s", fsa_pe_ref);
 275     }
 276     mainloop_timer_stop(controld_sched_timer);
 277 }
 278 
 279 /*!
 280  * \internal
 281  * \brief Set the scheduler request currently being waited on
 282  *
 283  * \param[in] ref  Request to expect reply to (or NULL for none)
 284  */
 285 void
 286 controld_expect_sched_reply(char *ref)
     /*  */
 287 {
 288     if (ref) {
 289         if (controld_sched_timer == NULL) {
 290             controld_sched_timer = mainloop_timer_add("scheduler_reply_timer",
 291                                                       SCHED_TIMEOUT_MS, FALSE,
 292                                                       controld_sched_timeout,
 293                                                       NULL);
 294         }
 295         mainloop_timer_start(controld_sched_timer);
 296     } else {
 297         controld_stop_sched_timer();
 298     }
 299     free(fsa_pe_ref);
 300     fsa_pe_ref = ref;
 301 }
 302 
 303 /*!
 304  * \internal
 305  * \brief Free the scheduler reply timer
 306  */
 307 void
 308 controld_free_sched_timer(void)
     /*  */
 309 {
 310     if (controld_sched_timer != NULL) {
 311         mainloop_timer_del(controld_sched_timer);
 312         controld_sched_timer = NULL;
 313     }
 314 }
 315 
 316 /*       A_PE_INVOKE    */
 317 void
 318 do_pe_invoke(long long action,
     /*  */
 319              enum crmd_fsa_cause cause,
 320              enum crmd_fsa_state cur_state,
 321              enum crmd_fsa_input current_input, fsa_data_t * msg_data)
 322 {
 323     if (AM_I_DC == FALSE) {
 324         crm_err("Not invoking scheduler because not DC: %s",
 325                 fsa_action2string(action));
 326         return;
 327     }
 328 
 329     if (!pcmk_is_set(fsa_input_register, R_PE_CONNECTED)) {
 330         if (pcmk_is_set(fsa_input_register, R_SHUTDOWN)) {
 331             crm_err("Cannot shut down gracefully without the scheduler");
 332             register_fsa_input_before(C_FSA_INTERNAL, I_TERMINATE, NULL);
 333 
 334         } else {
 335             crm_info("Waiting for the scheduler to connect");
 336             crmd_fsa_stall(FALSE);
 337             controld_set_fsa_action_flags(A_PE_START);
 338             trigger_fsa();
 339         }
 340         return;
 341     }
 342 
 343     if (cur_state != S_POLICY_ENGINE) {
 344         crm_notice("Not invoking scheduler because in state %s",
 345                    fsa_state2string(cur_state));
 346         return;
 347     }
 348     if (!pcmk_is_set(fsa_input_register, R_HAVE_CIB)) {
 349         crm_err("Attempted to invoke scheduler without consistent Cluster Information Base!");
 350 
 351         /* start the join from scratch */
 352         register_fsa_input_before(C_FSA_INTERNAL, I_ELECTION, NULL);
 353         return;
 354     }
 355 
 356     fsa_pe_query = fsa_cib_conn->cmds->query(fsa_cib_conn, NULL, NULL, cib_scope_local);
 357 
 358     crm_debug("Query %d: Requesting the current CIB: %s", fsa_pe_query,
 359               fsa_state2string(fsa_state));
 360 
 361     controld_expect_sched_reply(NULL);
 362     fsa_register_cib_callback(fsa_pe_query, FALSE, NULL, do_pe_invoke_callback);
 363 }
 364 
 365 static void
 366 force_local_option(xmlNode *xml, const char *attr_name, const char *attr_value)
     /*  */
 367 {
 368     int max = 0;
 369     int lpc = 0;
 370     const char *xpath_base = NULL;
 371     char *xpath_string = NULL;
 372     xmlXPathObjectPtr xpathObj = NULL;
 373 
 374     xpath_base = pcmk_cib_xpath_for(XML_CIB_TAG_CRMCONFIG);
 375     if (xpath_base == NULL) {
 376         crm_err(XML_CIB_TAG_CRMCONFIG " CIB element not known (bug?)");
 377         return;
 378     }
 379 
 380     xpath_string = crm_strdup_printf("%s//%s//nvpair[@name='%s']",
 381                                      xpath_base, XML_CIB_TAG_PROPSET,
 382                                      attr_name);
 383     xpathObj = xpath_search(xml, xpath_string);
 384     max = numXpathResults(xpathObj);
 385     free(xpath_string);
 386 
 387     for (lpc = 0; lpc < max; lpc++) {
 388         xmlNode *match = getXpathResult(xpathObj, lpc);
 389         crm_trace("Forcing %s/%s = %s", ID(match), attr_name, attr_value);
 390         crm_xml_add(match, XML_NVPAIR_ATTR_VALUE, attr_value);
 391     }
 392 
 393     if(max == 0) {
 394         xmlNode *configuration = NULL;
 395         xmlNode *crm_config = NULL;
 396         xmlNode *cluster_property_set = NULL;
 397 
 398         crm_trace("Creating %s-%s for %s=%s",
 399                   CIB_OPTIONS_FIRST, attr_name, attr_name, attr_value);
 400 
 401         configuration = pcmk__xe_match(xml, XML_CIB_TAG_CONFIGURATION, NULL,
 402                                        NULL);
 403         if (configuration == NULL) {
 404             configuration = create_xml_node(xml, XML_CIB_TAG_CONFIGURATION);
 405         }
 406 
 407         crm_config = pcmk__xe_match(configuration, XML_CIB_TAG_CRMCONFIG, NULL,
 408                                     NULL);
 409         if (crm_config == NULL) {
 410             crm_config = create_xml_node(configuration, XML_CIB_TAG_CRMCONFIG);
 411         }
 412 
 413         cluster_property_set = pcmk__xe_match(crm_config, XML_CIB_TAG_PROPSET,
 414                                               NULL, NULL);
 415         if (cluster_property_set == NULL) {
 416             cluster_property_set = create_xml_node(crm_config, XML_CIB_TAG_PROPSET);
 417             crm_xml_add(cluster_property_set, XML_ATTR_ID, CIB_OPTIONS_FIRST);
 418         }
 419 
 420         xml = create_xml_node(cluster_property_set, XML_CIB_TAG_NVPAIR);
 421 
 422         crm_xml_set_id(xml, "%s-%s", CIB_OPTIONS_FIRST, attr_name);
 423         crm_xml_add(xml, XML_NVPAIR_ATTR_NAME, attr_name);
 424         crm_xml_add(xml, XML_NVPAIR_ATTR_VALUE, attr_value);
 425     }
 426     freeXpathObject(xpathObj);
 427 }
 428 
 429 static void
 430 do_pe_invoke_callback(xmlNode * msg, int call_id, int rc, xmlNode * output, void *user_data)
     /*  */
 431 {
 432     char *ref = NULL;
 433     pid_t watchdog = pcmk__locate_sbd();
 434 
 435     if (rc != pcmk_ok) {
 436         crm_err("Could not retrieve the Cluster Information Base: %s "
 437                 CRM_XS " rc=%d call=%d", pcmk_strerror(rc), rc, call_id);
 438         register_fsa_error_adv(C_FSA_INTERNAL, I_ERROR, NULL, NULL, __func__);
 439         return;
 440 
 441     } else if (call_id != fsa_pe_query) {
 442         crm_trace("Skipping superseded CIB query: %d (current=%d)", call_id, fsa_pe_query);
 443         return;
 444 
 445     } else if (!AM_I_DC || !pcmk_is_set(fsa_input_register, R_PE_CONNECTED)) {
 446         crm_debug("No need to invoke the scheduler anymore");
 447         return;
 448 
 449     } else if (fsa_state != S_POLICY_ENGINE) {
 450         crm_debug("Discarding scheduler request in state: %s",
 451                   fsa_state2string(fsa_state));
 452         return;
 453 
 454     /* this callback counts as 1 */
 455     } else if (num_cib_op_callbacks() > 1) {
 456         crm_debug("Re-asking for the CIB: %d other peer updates still pending",
 457                   (num_cib_op_callbacks() - 1));
 458         sleep(1);
 459         controld_set_fsa_action_flags(A_PE_INVOKE);
 460         trigger_fsa();
 461         return;
 462     }
 463 
 464     CRM_LOG_ASSERT(output != NULL);
 465 
 466     /* Refresh the remote node cache and the known node cache when the
 467      * scheduler is invoked */
 468     pcmk__refresh_node_caches_from_cib(output);
 469 
 470     crm_xml_add(output, XML_ATTR_DC_UUID, fsa_our_uuid);
 471     crm_xml_add_int(output, XML_ATTR_HAVE_QUORUM, fsa_has_quorum);
 472 
 473     force_local_option(output, XML_ATTR_HAVE_WATCHDOG, pcmk__btoa(watchdog));
 474 
 475     if (ever_had_quorum && crm_have_quorum == FALSE) {
 476         crm_xml_add_int(output, XML_ATTR_QUORUM_PANIC, 1);
 477     }
 478 
 479     rc = pcmk_rc2legacy(pcmk_schedulerd_api_graph(schedulerd_api, output, &ref));
 480 
 481     if (rc < 0) {
 482         crm_err("Could not contact the scheduler: %s " CRM_XS " rc=%d",
 483                 pcmk_strerror(rc), rc);
 484         register_fsa_error_adv(C_FSA_INTERNAL, I_ERROR, NULL, NULL, __func__);
 485     } else {
 486         CRM_ASSERT(ref != NULL);
 487         controld_expect_sched_reply(ref);
 488         crm_debug("Invoking the scheduler: query=%d, ref=%s, seq=%llu, quorate=%d",
 489                   fsa_pe_query, fsa_pe_ref, crm_peer_seq, fsa_has_quorum);
 490     }
 491 }
/* */
root/daemons/controld/controld_schedulerd.c

DEFINITIONS
