daemons/controld/controld_join

/* */
This source file includes following definitions.
update_dc_expected
do_cl_join_query
do_cl_join_announce
do_cl_join_offer_respond
join_query_callback
set_join_state
update_conn_host_cache
do_cl_join_finalize_respond
   1 /*
   2  * Copyright 2004-2024 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 <crm/crm.h>
  13 #include <crm/cib.h>
  14 #include <crm/common/xml.h>
  15 
  16 #include <pacemaker-controld.h>
  17 
  18 void join_query_callback(xmlNode * msg, int call_id, int rc, xmlNode * output, void *user_data);
  19 
  20 extern ha_msg_input_t *copy_ha_msg_input(ha_msg_input_t * orig);
  21 
  22 /*!
  23  * \internal
  24  * \brief Remember if DC is shutting down as we join
  25  *
  26  * If we're joining while the current DC is shutting down, update its expected
  27  * state, so we don't fence it if we become the new DC. (We weren't a peer
  28  * when it broadcast its shutdown request.)
  29  *
  30  * \param[in] msg  A join message from the DC
  31  */
  32 static void
  33 update_dc_expected(const xmlNode *msg)
     /*  */
  34 {
  35     if ((controld_globals.dc_name != NULL)
  36         && pcmk__xe_attr_is_true(msg, PCMK__XA_DC_LEAVING)) {
  37         crm_node_t *dc_node = pcmk__get_node(0, controld_globals.dc_name, NULL,
  38                                              pcmk__node_search_cluster_member);
  39 
  40         pcmk__update_peer_expected(__func__, dc_node, CRMD_JOINSTATE_DOWN);
  41     }
  42 }
  43 
  44 /*      A_CL_JOIN_QUERY         */
  45 /* is there a DC out there? */
  46 void
  47 do_cl_join_query(long long action,
     /*  */
  48                  enum crmd_fsa_cause cause,
  49                  enum crmd_fsa_state cur_state,
  50                  enum crmd_fsa_input current_input, fsa_data_t * msg_data)
  51 {
  52     xmlNode *req = create_request(CRM_OP_JOIN_ANNOUNCE, NULL, NULL,
  53                                   CRM_SYSTEM_DC, CRM_SYSTEM_CRMD, NULL);
  54 
  55     sleep(1);                   // Give the cluster layer time to propagate to the DC
  56     update_dc(NULL);            /* Unset any existing value so that the result is not discarded */
  57     crm_debug("Querying for a DC");
  58     pcmk__cluster_send_message(NULL, crm_msg_crmd, req);
  59     free_xml(req);
  60 }
  61 
  62 /*       A_CL_JOIN_ANNOUNCE     */
  63 
  64 /* this is kind of a workaround for the fact that we may not be around or
  65  * are otherwise unable to reply when the DC sends out A_DC_JOIN_OFFER_ALL
  66  */
  67 void
  68 do_cl_join_announce(long long action,
     /*  */
  69                     enum crmd_fsa_cause cause,
  70                     enum crmd_fsa_state cur_state,
  71                     enum crmd_fsa_input current_input, fsa_data_t * msg_data)
  72 {
  73     /* don't announce if we're in one of these states */
  74     if (cur_state != S_PENDING) {
  75         crm_warn("Not announcing cluster join because in state %s",
  76                  fsa_state2string(cur_state));
  77         return;
  78     }
  79 
  80     if (!pcmk_is_set(controld_globals.fsa_input_register, R_STARTING)) {
  81         /* send as a broadcast */
  82         xmlNode *req = create_request(CRM_OP_JOIN_ANNOUNCE, NULL, NULL,
  83                                       CRM_SYSTEM_DC, CRM_SYSTEM_CRMD, NULL);
  84 
  85         crm_debug("Announcing availability");
  86         update_dc(NULL);
  87         pcmk__cluster_send_message(NULL, crm_msg_crmd, req);
  88         free_xml(req);
  89 
  90     } else {
  91         /* Delay announce until we have finished local startup */
  92         crm_warn("Delaying announce of cluster join until local startup is complete");
  93         return;
  94     }
  95 }
  96 
  97 static int query_call_id = 0;
  98 
  99 /*       A_CL_JOIN_REQUEST      */
 100 /* aka. accept the welcome offer */
 101 void
 102 do_cl_join_offer_respond(long long action,
     /*  */
 103                          enum crmd_fsa_cause cause,
 104                          enum crmd_fsa_state cur_state,
 105                          enum crmd_fsa_input current_input, fsa_data_t * msg_data)
 106 {
 107     cib_t *cib_conn = controld_globals.cib_conn;
 108 
 109     ha_msg_input_t *input = fsa_typed_data(fsa_dt_ha_msg);
 110     const char *welcome_from;
 111     const char *join_id;
 112 
 113     CRM_CHECK(input != NULL, return);
 114 
 115     welcome_from = crm_element_value(input->msg, PCMK__XA_SRC);
 116     join_id = crm_element_value(input->msg, PCMK__XA_JOIN_ID);
 117     crm_trace("Accepting cluster join offer from node %s "CRM_XS" join-%s",
 118               welcome_from, crm_element_value(input->msg, PCMK__XA_JOIN_ID));
 119 
 120     /* we only ever want the last one */
 121     if (query_call_id > 0) {
 122         crm_trace("Cancelling previous join query: %d", query_call_id);
 123         remove_cib_op_callback(query_call_id, FALSE);
 124         query_call_id = 0;
 125     }
 126 
 127     if (update_dc(input->msg) == FALSE) {
 128         crm_warn("Discarding cluster join offer from node %s (expected %s)",
 129                  welcome_from, controld_globals.dc_name);
 130         return;
 131     }
 132 
 133     update_dc_expected(input->msg);
 134 
 135     query_call_id = cib_conn->cmds->query(cib_conn, NULL, NULL,
 136                                           cib_scope_local|cib_no_children);
 137     fsa_register_cib_callback(query_call_id, pcmk__str_copy(join_id),
 138                               join_query_callback);
 139     crm_trace("Registered join query callback: %d", query_call_id);
 140 
 141     controld_set_fsa_action_flags(A_DC_TIMER_STOP);
 142     controld_trigger_fsa();
 143 }
 144 
 145 void
 146 join_query_callback(xmlNode * msg, int call_id, int rc, xmlNode * output, void *user_data)
     /*  */
 147 {
 148     char *join_id = user_data;
 149     xmlNode *generation = pcmk__xe_create(NULL, PCMK__XE_GENERATION_TUPLE);
 150 
 151     CRM_LOG_ASSERT(join_id != NULL);
 152 
 153     if (query_call_id != call_id) {
 154         crm_trace("Query %d superseded", call_id);
 155         goto done;
 156     }
 157 
 158     query_call_id = 0;
 159     if(rc != pcmk_ok || output == NULL) {
 160         crm_err("Could not retrieve version details for join-%s: %s (%d)",
 161                 join_id, pcmk_strerror(rc), rc);
 162         register_fsa_error_adv(C_FSA_INTERNAL, I_ERROR, NULL, NULL, __func__);
 163 
 164     } else if (controld_globals.dc_name == NULL) {
 165         crm_debug("Membership is in flux, not continuing join-%s", join_id);
 166 
 167     } else {
 168         xmlNode *reply = NULL;
 169         const crm_node_t *dc_node =
 170             pcmk__get_node(0, controld_globals.dc_name, NULL,
 171                            pcmk__node_search_cluster_member);
 172 
 173         crm_debug("Respond to join offer join-%s from %s",
 174                   join_id, controld_globals.dc_name);
 175         pcmk__xe_copy_attrs(generation, output, pcmk__xaf_none);
 176 
 177         reply = create_request(CRM_OP_JOIN_REQUEST, generation,
 178                                controld_globals.dc_name, CRM_SYSTEM_DC,
 179                                CRM_SYSTEM_CRMD, NULL);
 180 
 181         crm_xml_add(reply, PCMK__XA_JOIN_ID, join_id);
 182         crm_xml_add(reply, PCMK_XA_CRM_FEATURE_SET, CRM_FEATURE_SET);
 183         pcmk__cluster_send_message(dc_node, crm_msg_crmd, reply);
 184         free_xml(reply);
 185     }
 186 
 187   done:
 188     free_xml(generation);
 189 }
 190 
 191 void
 192 set_join_state(const char *start_state, const char *node_name, const char *node_uuid,
     /*  */
 193                bool remote)
 194 {
 195     if (pcmk__str_eq(start_state, PCMK_VALUE_STANDBY, pcmk__str_casei)) {
 196         crm_notice("Forcing node %s to join in %s state per configured "
 197                    "environment", node_name, start_state);
 198         cib__update_node_attr(controld_globals.logger_out,
 199                               controld_globals.cib_conn, cib_sync_call,
 200                               PCMK_XE_NODES, node_uuid,
 201                               NULL, NULL, NULL, PCMK_NODE_ATTR_STANDBY,
 202                               PCMK_VALUE_TRUE, NULL,
 203                               (remote? PCMK_VALUE_REMOTE : NULL));
 204 
 205     } else if (pcmk__str_eq(start_state, PCMK_VALUE_ONLINE, pcmk__str_casei)) {
 206         crm_notice("Forcing node %s to join in %s state per configured "
 207                    "environment", node_name, start_state);
 208         cib__update_node_attr(controld_globals.logger_out,
 209                               controld_globals.cib_conn, cib_sync_call,
 210                               PCMK_XE_NODES, node_uuid,
 211                               NULL, NULL, NULL, PCMK_NODE_ATTR_STANDBY,
 212                               PCMK_VALUE_FALSE, NULL,
 213                               (remote? PCMK_VALUE_REMOTE : NULL));
 214 
 215     } else if (pcmk__str_eq(start_state, PCMK_VALUE_DEFAULT, pcmk__str_casei)) {
 216         crm_debug("Not forcing a starting state on node %s", node_name);
 217 
 218     } else {
 219         crm_warn("Unrecognized start state '%s', using "
 220                  "'" PCMK_VALUE_DEFAULT "' (%s)",
 221                  start_state, node_name);
 222     }
 223 }
 224 
 225 static int
 226 update_conn_host_cache(xmlNode *node, void *userdata)
     /*  */
 227 {
 228     const char *remote = crm_element_value(node, PCMK_XA_ID);
 229     const char *conn_host = crm_element_value(node, PCMK__XA_CONNECTION_HOST);
 230     const char *state = crm_element_value(node, PCMK__XA_NODE_STATE);
 231 
 232     crm_node_t *remote_peer = pcmk__cluster_lookup_remote_node(remote);
 233 
 234     if (remote_peer == NULL) {
 235         return pcmk_rc_ok;
 236     }
 237 
 238     if (conn_host != NULL) {
 239         pcmk__str_update(&remote_peer->conn_host, conn_host);
 240     }
 241 
 242     if (state != NULL) {
 243         pcmk__update_peer_state(__func__, remote_peer, state, 0);
 244     }
 245 
 246     return pcmk_rc_ok;
 247 }
 248 
 249 /*      A_CL_JOIN_RESULT        */
 250 /* aka. this is notification that we have (or have not) been accepted */
 251 void
 252 do_cl_join_finalize_respond(long long action,
     /*  */
 253                             enum crmd_fsa_cause cause,
 254                             enum crmd_fsa_state cur_state,
 255                             enum crmd_fsa_input current_input, fsa_data_t * msg_data)
 256 {
 257     xmlNode *tmp1 = NULL;
 258     gboolean was_nack = TRUE;
 259     static gboolean first_join = TRUE;
 260     ha_msg_input_t *input = fsa_typed_data(fsa_dt_ha_msg);
 261     const char *start_state = pcmk__env_option(PCMK__ENV_NODE_START_STATE);
 262 
 263     int join_id = -1;
 264     const char *op = crm_element_value(input->msg, PCMK__XA_CRM_TASK);
 265     const char *welcome_from = crm_element_value(input->msg, PCMK__XA_SRC);
 266 
 267     if (!pcmk__str_eq(op, CRM_OP_JOIN_ACKNAK, pcmk__str_casei)) {
 268         crm_trace("Ignoring op=%s message", op);
 269         return;
 270     }
 271 
 272     /* calculate if it was an ack or a nack */
 273     if (pcmk__xe_attr_is_true(input->msg, CRM_OP_JOIN_ACKNAK)) {
 274         was_nack = FALSE;
 275     }
 276 
 277     crm_element_value_int(input->msg, PCMK__XA_JOIN_ID, &join_id);
 278 
 279     if (was_nack) {
 280         crm_err("Shutting down because cluster join with leader %s failed "
 281                 CRM_XS" join-%d NACK'd", welcome_from, join_id);
 282         register_fsa_error(C_FSA_INTERNAL, I_ERROR, NULL);
 283         controld_set_fsa_input_flags(R_STAYDOWN);
 284         return;
 285     }
 286 
 287     if (!AM_I_DC
 288         && pcmk__str_eq(welcome_from, controld_globals.our_nodename,
 289                         pcmk__str_casei)) {
 290         crm_warn("Discarding our own welcome - we're no longer the DC");
 291         return;
 292     }
 293 
 294     if (update_dc(input->msg) == FALSE) {
 295         crm_warn("Discarding %s from node %s (expected from %s)",
 296                  op, welcome_from, controld_globals.dc_name);
 297         return;
 298     }
 299 
 300     update_dc_expected(input->msg);
 301 
 302     /* record the node's feature set as a transient attribute */
 303     update_attrd(controld_globals.our_nodename, CRM_ATTR_FEATURE_SET,
 304                  CRM_FEATURE_SET, NULL, FALSE);
 305 
 306     /* send our status section to the DC */
 307     tmp1 = controld_query_executor_state();
 308     if (tmp1 != NULL) {
 309         xmlNode *remotes = NULL;
 310         xmlNode *reply = create_request(CRM_OP_JOIN_CONFIRM, tmp1,
 311                                         controld_globals.dc_name, CRM_SYSTEM_DC,
 312                                         CRM_SYSTEM_CRMD, NULL);
 313         const crm_node_t *dc_node =
 314             pcmk__get_node(0, controld_globals.dc_name, NULL,
 315                            pcmk__node_search_cluster_member);
 316 
 317         crm_xml_add_int(reply, PCMK__XA_JOIN_ID, join_id);
 318 
 319         crm_debug("Confirming join-%d: sending local operation history to %s",
 320                   join_id, controld_globals.dc_name);
 321 
 322         /*
 323          * If this is the node's first join since the controller started on it,
 324          * set its initial state (standby or member) according to the user's
 325          * preference.
 326          *
 327          * We do not clear the LRM history here. Even if the DC failed to do it
 328          * when we last left, removing them here creates a race condition if the
 329          * controller is being recovered. Instead of a list of active resources
 330          * from the executor, we may end up with a blank status section. If we
 331          * are _NOT_ lucky, we will probe for the "wrong" instance of anonymous
 332          * clones and end up with multiple active instances on the machine.
 333          */
 334         if (first_join
 335             && !pcmk_is_set(controld_globals.fsa_input_register, R_SHUTDOWN)) {
 336 
 337             first_join = FALSE;
 338             if (start_state) {
 339                 set_join_state(start_state, controld_globals.our_nodename,
 340                                controld_globals.our_uuid, false);
 341             }
 342         }
 343 
 344         pcmk__cluster_send_message(dc_node, crm_msg_crmd, reply);
 345         free_xml(reply);
 346 
 347         if (AM_I_DC == FALSE) {
 348             register_fsa_input_adv(cause, I_NOT_DC, NULL, A_NOTHING, TRUE,
 349                                    __func__);
 350         }
 351 
 352         free_xml(tmp1);
 353 
 354         /* Update the remote node cache with information about which node
 355          * is hosting the connection.
 356          */
 357         remotes = pcmk__xe_first_child(input->msg, PCMK_XE_NODES, NULL, NULL);
 358         if (remotes != NULL) {
 359             pcmk__xe_foreach_child(remotes, PCMK_XE_NODE,
 360                                    update_conn_host_cache, NULL);
 361         }
 362 
 363     } else {
 364         crm_err("Could not confirm join-%d with %s: Local operation history "
 365                 "failed", join_id, controld_globals.dc_name);
 366         register_fsa_error(C_FSA_INTERNAL, I_FAIL, NULL);
 367     }
 368 }
/* */
root/daemons/controld/controld_join_client.c

DEFINITIONS
