pe_notif.c

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/*
 * Copyright 2004-2022 the Pacemaker project contributors
 *
 * The version control history for this file may have further details.
 *
 * This source code is licensed under the GNU General Public License version 2
 * or later (GPLv2+) WITHOUT ANY WARRANTY.
 */
 
#include <crm_internal.h>
#include <crm/msg_xml.h>
#include <pacemaker-internal.h>
 
typedef struct notify_entry_s {
    pe_resource_t *rsc;
    pe_node_t *node;
} notify_entry_t;
 
static gint
compare_notify_entries(gconstpointer a, gconstpointer b)
{
    int tmp;
    const notify_entry_t *entry_a = a;
    const notify_entry_t *entry_b = b;
 
    // NULL a or b is not actually possible
    if ((entry_a == NULL) && (entry_b == NULL)) {
        return 0;
    }
    if (entry_a == NULL) {
        return 1;
    }
    if (entry_b == NULL) {
        return -1;
    }
 
    // NULL resources sort first
    if ((entry_a->rsc == NULL) && (entry_b->rsc == NULL)) {
        return 0;
    }
    if (entry_a->rsc == NULL) {
        return 1;
    }
    if (entry_b->rsc == NULL) {
        return -1;
    }
 
    // Compare resource names
    tmp = strcmp(entry_a->rsc->id, entry_b->rsc->id);
    if (tmp != 0) {
        return tmp;
    }
 
    // Otherwise NULL nodes sort first
    if ((entry_a->node == NULL) && (entry_b->node == NULL)) {
        return 0;
    }
    if (entry_a->node == NULL) {
        return 1;
    }
    if (entry_b->node == NULL) {
        return -1;
    }
 
    // Finally, compare node names
    return strcmp(entry_a->node->details->id, entry_b->node->details->id);
}
 
static notify_entry_t *
dup_notify_entry(notify_entry_t *entry)
{
    notify_entry_t *dup = calloc(1, sizeof(notify_entry_t));
 
    CRM_ASSERT(dup != NULL);
    dup->rsc = entry->rsc;
    dup->node = entry->node;
    return dup;
}
 
static void
get_node_names(GList *list, GString **all_node_names, GString **host_node_names)
{
    if (all_node_names != NULL) {
        *all_node_names = NULL;
    }
    if (host_node_names != NULL) {
        *host_node_names = NULL;
    }
 
    for (GList *iter = list; iter != NULL; iter = iter->next) {
        pe_node_t *node = (pe_node_t *) iter->data;
 
        if (node->details->uname == NULL) {
            continue;
        }
 
        // Always add to list of all node names
        if (all_node_names != NULL) {
            pcmk__add_word(all_node_names, 1024, node->details->uname);
        }
 
        // Add to host node name list if appropriate
        if (host_node_names != NULL) {
            if (pe__is_guest_node(node)
                && (node->details->remote_rsc->container->running_on != NULL)) {
                node = pe__current_node(node->details->remote_rsc->container);
                if (node->details->uname == NULL) {
                    continue;
                }
            }
            pcmk__add_word(host_node_names, 1024, node->details->uname);
        }
    }
 
    if ((all_node_names != NULL) && (*all_node_names == NULL)) {
        *all_node_names = g_string_new(" ");
    }
    if ((host_node_names != NULL) && (*host_node_names == NULL)) {
        *host_node_names = g_string_new(" ");
    }
}
 
static GList *
notify_entries_to_strings(GList *list, GString **rsc_names,
                          GString **node_names)
{
    const char *last_rsc_id = NULL;
 
    // Initialize output lists to NULL
    if (rsc_names != NULL) {
        *rsc_names = NULL;
    }
    if (node_names != NULL) {
        *node_names = NULL;
    }
 
    // Sort input list for user-friendliness (and ease of filtering duplicates)
    list = g_list_sort(list, compare_notify_entries);
 
    for (GList *gIter = list; gIter != NULL; gIter = gIter->next) {
        notify_entry_t *entry = (notify_entry_t *) gIter->data;
 
        // Entry must have a resource (with ID)
        CRM_LOG_ASSERT((entry != NULL) && (entry->rsc != NULL)
                       && (entry->rsc->id != NULL));
        if ((entry == NULL) || (entry->rsc == NULL)
            || (entry->rsc->id == NULL)) {
            continue;
        }
 
        // Entry must have a node unless listing inactive resources
        CRM_LOG_ASSERT((node_names == NULL) || (entry->node != NULL));
        if ((node_names != NULL) && (entry->node == NULL)) {
            continue;
        }
 
        // Don't add duplicates of a particular clone instance
        if (pcmk__str_eq(entry->rsc->id, last_rsc_id, pcmk__str_none)) {
            continue;
        }
        last_rsc_id = entry->rsc->id;
 
        if (rsc_names != NULL) {
            pcmk__add_word(rsc_names, 1024, entry->rsc->id);
        }
        if ((node_names != NULL) && (entry->node->details->uname != NULL)) {
            pcmk__add_word(node_names, 1024, entry->node->details->uname);
        }
    }
 
    // If there are no entries, return "empty" lists
    if ((rsc_names != NULL) && (*rsc_names == NULL)) {
        *rsc_names = g_string_new(" ");
    }
    if ((node_names != NULL) && (*node_names == NULL)) {
        *node_names = g_string_new(" ");
    }
 
    return list;
}
 
static void
copy_meta_to_notify(gpointer key, gpointer value, gpointer user_data)
{
    pe_action_t *notify = (pe_action_t *) user_data;
 
    /* Any existing meta-attributes (for example, the action timeout) are for
     * the notify action itself, so don't override those.
     */
    if (g_hash_table_lookup(notify->meta, (const char *) key) != NULL) {
        return;
    }
 
    g_hash_table_insert(notify->meta, strdup((const char *) key),
                        strdup((const char *) value));
}
 
static void
add_notify_data_to_action_meta(notify_data_t *n_data, pe_action_t *action)
{
    for (GSList *item = n_data->keys; item; item = item->next) {
        pcmk_nvpair_t *nvpair = item->data;
 
        add_hash_param(action->meta, nvpair->name, nvpair->value);
    }
}
 
static pe_action_t *
new_notify_pseudo_action(pe_resource_t *rsc, const pe_action_t *action,
                         const char *notif_action, const char *notif_type)
{
    pe_action_t *notify = NULL;
 
    notify = custom_action(rsc,
                           pcmk__notify_key(rsc->id, notif_type, action->task),
                           notif_action, NULL,
                           pcmk_is_set(action->flags, pe_action_optional),
                           TRUE, rsc->cluster);
    pe__set_action_flags(notify, pe_action_pseudo);
    add_hash_param(notify->meta, "notify_key_type", notif_type);
    add_hash_param(notify->meta, "notify_key_operation", action->task);
    return notify;
}
 
static pe_action_t *
new_notify_action(pe_resource_t *rsc, pe_node_t *node, pe_action_t *op,
                  pe_action_t *notify_done, notify_data_t *n_data)
{
    char *key = NULL;
    pe_action_t *notify_action = NULL;
    const char *value = NULL;
    const char *task = NULL;
    const char *skip_reason = NULL;
 
    CRM_CHECK((rsc != NULL) && (node != NULL), return NULL);
 
    // Ensure we have all the info we need
    if (op == NULL) {
        skip_reason = "no action";
    } else if (notify_done == NULL) {
        skip_reason = "no parent notification";
    } else if (!node->details->online) {
        skip_reason = "node offline";
    } else if (!pcmk_is_set(op->flags, pe_action_runnable)) {
        skip_reason = "original action not runnable";
    }
    if (skip_reason != NULL) {
        pe_rsc_trace(rsc, "Skipping notify action for %s on %s: %s",
                     rsc->id, pe__node_name(node), skip_reason);
        return NULL;
    }
 
    value = g_hash_table_lookup(op->meta, "notify_type");     // "pre" or "post"
    task = g_hash_table_lookup(op->meta, "notify_operation"); // original action
 
    pe_rsc_trace(rsc, "Creating notify action for %s on %s (%s-%s)",
                 rsc->id, pe__node_name(node), value, task);
 
    // Create the notify action
    key = pcmk__notify_key(rsc->id, value, task);
    notify_action = custom_action(rsc, key, op->task, node,
                                  pcmk_is_set(op->flags, pe_action_optional),
                                  TRUE, rsc->cluster);
 
    // Add meta-data to notify action
    g_hash_table_foreach(op->meta, copy_meta_to_notify, notify_action);
    add_notify_data_to_action_meta(n_data, notify_action);
 
    // Order notify after original action and before parent notification
    order_actions(op, notify_action, pe_order_optional);
    order_actions(notify_action, notify_done, pe_order_optional);
    return notify_action;
}
 
static void
new_post_notify_action(pe_resource_t *rsc, pe_node_t *node,
                       notify_data_t *n_data)
{
    pe_action_t *notify = NULL;
 
    CRM_ASSERT(n_data != NULL);
 
    // Create the "post-" notify action for specified instance
    notify = new_notify_action(rsc, node, n_data->post, n_data->post_done,
                               n_data);
    if (notify != NULL) {
        notify->priority = INFINITY;
    }
 
    // Order recurring monitors after all "post-" notifications complete
    if (n_data->post_done == NULL) {
        return;
    }
    for (GList *iter = rsc->actions; iter != NULL; iter = iter->next) {
        pe_action_t *mon = (pe_action_t *) iter->data;
        const char *interval_ms_s = NULL;
 
        interval_ms_s = g_hash_table_lookup(mon->meta,
                                            XML_LRM_ATTR_INTERVAL_MS);
        if (pcmk__str_eq(interval_ms_s, "0", pcmk__str_null_matches)
            || pcmk__str_eq(mon->task, RSC_CANCEL, pcmk__str_none)) {
            continue; // Not a recurring monitor
        }
        order_actions(n_data->post_done, mon, pe_order_optional);
    }
}
 
notify_data_t *
pe__clone_notif_pseudo_ops(pe_resource_t *rsc, const char *task,
                           pe_action_t *action, pe_action_t *complete)
{
    notify_data_t *n_data = NULL;
 
    if (!pcmk_is_set(rsc->flags, pe_rsc_notify)) {
        return NULL;
    }
 
    n_data = calloc(1, sizeof(notify_data_t));
    CRM_ASSERT(n_data != NULL);
 
    n_data->action = task;
 
    if (action != NULL) { // Need "pre-" pseudo-actions
 
        // Create "pre-" notify pseudo-action for clone
        n_data->pre = new_notify_pseudo_action(rsc, action, RSC_NOTIFY, "pre");
        pe__set_action_flags(n_data->pre, pe_action_runnable);
        add_hash_param(n_data->pre->meta, "notify_type", "pre");
        add_hash_param(n_data->pre->meta, "notify_operation", n_data->action);
 
        // Create "pre-" notifications complete pseudo-action for clone
        n_data->pre_done = new_notify_pseudo_action(rsc, action, RSC_NOTIFIED,
                                                    "confirmed-pre");
        pe__set_action_flags(n_data->pre_done, pe_action_runnable);
        add_hash_param(n_data->pre_done->meta, "notify_type", "pre");
        add_hash_param(n_data->pre_done->meta,
                       "notify_operation", n_data->action);
 
        // Order "pre-" -> "pre-" complete -> original action
        order_actions(n_data->pre, n_data->pre_done, pe_order_optional);
        order_actions(n_data->pre_done, action, pe_order_optional);
    }
 
    if (complete != NULL) { // Need "post-" pseudo-actions
 
        // Create "post-" notify pseudo-action for clone
        n_data->post = new_notify_pseudo_action(rsc, complete, RSC_NOTIFY,
                                                "post");
        n_data->post->priority = INFINITY;
        if (pcmk_is_set(complete->flags, pe_action_runnable)) {
            pe__set_action_flags(n_data->post, pe_action_runnable);
        } else {
            pe__clear_action_flags(n_data->post, pe_action_runnable);
        }
        add_hash_param(n_data->post->meta, "notify_type", "post");
        add_hash_param(n_data->post->meta, "notify_operation", n_data->action);
 
        // Create "post-" notifications complete pseudo-action for clone
        n_data->post_done = new_notify_pseudo_action(rsc, complete,
                                                     RSC_NOTIFIED,
                                                     "confirmed-post");
        n_data->post_done->priority = INFINITY;
        if (pcmk_is_set(complete->flags, pe_action_runnable)) {
            pe__set_action_flags(n_data->post_done, pe_action_runnable);
        } else {
            pe__clear_action_flags(n_data->post_done, pe_action_runnable);
        }
        add_hash_param(n_data->post_done->meta, "notify_type", "post");
        add_hash_param(n_data->post_done->meta,
                       "notify_operation", n_data->action);
 
        // Order original action complete -> "post-" -> "post-" complete
        order_actions(complete, n_data->post, pe_order_implies_then);
        order_actions(n_data->post, n_data->post_done, pe_order_implies_then);
    }
 
    // If we created both, order "pre-" complete -> "post-"
    if ((action != NULL) && (complete != NULL)) {
        order_actions(n_data->pre_done, n_data->post, pe_order_optional);
    }
    return n_data;
}
 
static notify_entry_t *
new_notify_entry(pe_resource_t *rsc, pe_node_t *node)
{
    notify_entry_t *entry = calloc(1, sizeof(notify_entry_t));
 
    CRM_ASSERT(entry != NULL);
    entry->rsc = rsc;
    entry->node = node;
    return entry;
}
 
static void
collect_resource_data(pe_resource_t *rsc, bool activity, notify_data_t *n_data)
{
    GList *iter = NULL;
    notify_entry_t *entry = NULL;
    pe_node_t *node = NULL;
 
    if (n_data == NULL) {
        return;
    }
 
    if (n_data->allowed_nodes == NULL) {
        n_data->allowed_nodes = rsc->allowed_nodes;
    }
 
    // If this is a clone, call recursively for each instance
    if (rsc->children != NULL) {
        for (iter = rsc->children; iter != NULL; iter = iter->next) {
            pe_resource_t *child = (pe_resource_t *) iter->data;
 
            collect_resource_data(child, activity, n_data);
        }
        return;
    }
 
    // This is a notification for a single clone instance
 
    if (rsc->running_on != NULL) {
        node = rsc->running_on->data; // First is sufficient
    }
    entry = new_notify_entry(rsc, node);
 
    // Add notification indicating the resource state
    switch (rsc->role) {
        case RSC_ROLE_STOPPED:
            n_data->inactive = g_list_prepend(n_data->inactive, entry);
            break;
 
        case RSC_ROLE_STARTED:
            n_data->active = g_list_prepend(n_data->active, entry);
            break;
 
        case RSC_ROLE_UNPROMOTED:
            n_data->unpromoted = g_list_prepend(n_data->unpromoted, entry);
            n_data->active = g_list_prepend(n_data->active,
                                            dup_notify_entry(entry));
            break;
 
        case RSC_ROLE_PROMOTED:
            n_data->promoted = g_list_prepend(n_data->promoted, entry);
            n_data->active = g_list_prepend(n_data->active,
                                            dup_notify_entry(entry));
            break;
 
        default:
            crm_err("Resource %s role on %s (%s) is not supported for "
                    "notifications (bug?)",
                    rsc->id, pe__node_name(node), role2text(rsc->role));
            free(entry);
            break;
    }
 
    if (!activity) {
        return;
    }
 
    // Add notification entries for each of the resource's actions
    for (iter = rsc->actions; iter != NULL; iter = iter->next) {
        pe_action_t *op = (pe_action_t *) iter->data;
 
        if (!pcmk_is_set(op->flags, pe_action_optional) && (op->node != NULL)) {
            enum action_tasks task = text2task(op->task);
 
            if ((task == stop_rsc) && op->node->details->unclean) {
                // Create anyway (additional noise if node can't be fenced)
            } else if (!pcmk_is_set(op->flags, pe_action_runnable)) {
                continue;
            }
 
            entry = new_notify_entry(rsc, op->node);
 
            switch (task) {
                case start_rsc:
                    n_data->start = g_list_prepend(n_data->start, entry);
                    break;
                case stop_rsc:
                    n_data->stop = g_list_prepend(n_data->stop, entry);
                    break;
                case action_promote:
                    n_data->promote = g_list_prepend(n_data->promote, entry);
                    break;
                case action_demote:
                    n_data->demote = g_list_prepend(n_data->demote, entry);
                    break;
                default:
                    free(entry);
                    break;
            }
        }
    }
}
 
// For (char *) value
#define add_notify_env(n_data, key, value) do {                         \
         n_data->keys = pcmk_prepend_nvpair(n_data->keys, key, value);  \
    } while (0)
 
// For (GString *) value
#define add_notify_env_gs(n_data, key, value) do {                      \
         n_data->keys = pcmk_prepend_nvpair(n_data->keys, key,          \
                                            (const char *) value->str); \
    } while (0)
 
// For (GString *) value
#define add_notify_env_free_gs(n_data, key, value) do {                 \
         n_data->keys = pcmk_prepend_nvpair(n_data->keys, key,          \
                                            (const char *) value->str); \
         g_string_free(value, TRUE); value = NULL;                      \
    } while (0)
 
static void
add_notif_keys(pe_resource_t *rsc, notify_data_t *n_data)
{
    bool required = false; // Whether to make notify actions required
    GString *rsc_list = NULL;
    GString *node_list = NULL;
    GString *metal_list = NULL;
    const char *source = NULL;
    GList *nodes = NULL;
 
    n_data->stop = notify_entries_to_strings(n_data->stop,
                                             &rsc_list, &node_list);
    if ((strcmp(" ", (const char *) rsc_list->str) != 0)
        && pcmk__str_eq(n_data->action, RSC_STOP, pcmk__str_none)) {
        required = true;
    }
    add_notify_env_free_gs(n_data, "notify_stop_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_stop_uname", node_list);
 
    if ((n_data->start != NULL)
        && pcmk__str_eq(n_data->action, RSC_START, pcmk__str_none)) {
        required = true;
    }
    n_data->start = notify_entries_to_strings(n_data->start,
                                              &rsc_list, &node_list);
    add_notify_env_free_gs(n_data, "notify_start_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_start_uname", node_list);
 
    if ((n_data->demote != NULL)
        && pcmk__str_eq(n_data->action, RSC_DEMOTE, pcmk__str_none)) {
        required = true;
    }
    n_data->demote = notify_entries_to_strings(n_data->demote,
                                               &rsc_list, &node_list);
    add_notify_env_free_gs(n_data, "notify_demote_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_demote_uname", node_list);
 
    if ((n_data->promote != NULL)
        && pcmk__str_eq(n_data->action, RSC_PROMOTE, pcmk__str_none)) {
        required = true;
    }
    n_data->promote = notify_entries_to_strings(n_data->promote,
                                                &rsc_list, &node_list);
    add_notify_env_free_gs(n_data, "notify_promote_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_promote_uname", node_list);
 
    n_data->active = notify_entries_to_strings(n_data->active,
                                               &rsc_list, &node_list);
    add_notify_env_free_gs(n_data, "notify_active_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_active_uname", node_list);
 
    n_data->unpromoted = notify_entries_to_strings(n_data->unpromoted,
                                                   &rsc_list, &node_list);
    add_notify_env_gs(n_data, "notify_unpromoted_resource", rsc_list);
    add_notify_env_gs(n_data, "notify_unpromoted_uname", node_list);
 
    // Deprecated: kept for backward compatibility with older resource agents
    add_notify_env_free_gs(n_data, "notify_slave_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_slave_uname", node_list);
 
    n_data->promoted = notify_entries_to_strings(n_data->promoted,
                                                 &rsc_list, &node_list);
    add_notify_env_gs(n_data, "notify_promoted_resource", rsc_list);
    add_notify_env_gs(n_data, "notify_promoted_uname", node_list);
 
    // Deprecated: kept for backward compatibility with older resource agents
    add_notify_env_free_gs(n_data, "notify_master_resource", rsc_list);
    add_notify_env_free_gs(n_data, "notify_master_uname", node_list);
 
    n_data->inactive = notify_entries_to_strings(n_data->inactive,
                                                 &rsc_list, NULL);
    add_notify_env_free_gs(n_data, "notify_inactive_resource", rsc_list);
 
    nodes = g_hash_table_get_values(n_data->allowed_nodes);
    if (!pcmk__is_daemon) {
        /* For display purposes, sort the node list, for consistent
         * regression test output (while avoiding the performance hit
         * for the live cluster).
         */
        nodes = g_list_sort(nodes, pe__cmp_node_name);
    }
    get_node_names(nodes, &node_list, NULL);
    add_notify_env_free_gs(n_data, "notify_available_uname", node_list);
    g_list_free(nodes);
 
    source = g_hash_table_lookup(rsc->meta, XML_RSC_ATTR_TARGET);
    if (pcmk__str_eq("host", source, pcmk__str_none)) {
        get_node_names(rsc->cluster->nodes, &node_list, &metal_list);
        add_notify_env_free_gs(n_data, "notify_all_hosts", metal_list);
    } else {
        get_node_names(rsc->cluster->nodes, &node_list, NULL);
    }
    add_notify_env_free_gs(n_data, "notify_all_uname", node_list);
 
    if (required && (n_data->pre != NULL)) {
        pe__clear_action_flags(n_data->pre, pe_action_optional);
        pe__clear_action_flags(n_data->pre_done, pe_action_optional);
    }
 
    if (required && (n_data->post != NULL)) {
        pe__clear_action_flags(n_data->post, pe_action_optional);
        pe__clear_action_flags(n_data->post_done, pe_action_optional);
    }
}
 
/*
 * \internal
 * \brief Find any remote connection start relevant to an action
 *
 * \param[in] action  Action to check
 *
 * \return If action is behind a remote connection, connection's start
 */
static pe_action_t *
find_remote_start(pe_action_t *action)
{
    if ((action != NULL) && (action->node != NULL)) {
        pe_resource_t *remote_rsc = action->node->details->remote_rsc;
 
        if (remote_rsc != NULL) {
            return find_first_action(remote_rsc->actions, NULL, RSC_START,
                                     NULL);
        }
    }
    return NULL;
}
 
static void
create_notify_actions(pe_resource_t *rsc, notify_data_t *n_data)
{
    GList *iter = NULL;
    pe_action_t *stop = NULL;
    pe_action_t *start = NULL;
    enum action_tasks task = text2task(n_data->action);
 
    // If this is a clone, call recursively for each instance
    if (rsc->children != NULL) {
        g_list_foreach(rsc->children, (GFunc) create_notify_actions, n_data);
        return;
    }
 
    // Add notification meta-attributes to original actions
    for (iter = rsc->actions; iter != NULL; iter = iter->next) {
        pe_action_t *op = (pe_action_t *) iter->data;
 
        if (!pcmk_is_set(op->flags, pe_action_optional) && (op->node != NULL)) {
            switch (text2task(op->task)) {
                case start_rsc:
                case stop_rsc:
                case action_promote:
                case action_demote:
                    add_notify_data_to_action_meta(n_data, op);
                    break;
                default:
                    break;
            }
        }
    }
 
    // Skip notify action itself if original action was not needed
    switch (task) {
        case start_rsc:
            if (n_data->start == NULL) {
                pe_rsc_trace(rsc, "No notify action needed for %s %s",
                             rsc->id, n_data->action);
                return;
            }
            break;
 
        case action_promote:
            if (n_data->promote == NULL) {
                pe_rsc_trace(rsc, "No notify action needed for %s %s",
                             rsc->id, n_data->action);
                return;
            }
            break;
 
        case action_demote:
            if (n_data->demote == NULL) {
                pe_rsc_trace(rsc, "No notify action needed for %s %s",
                             rsc->id, n_data->action);
                return;
            }
            break;
 
        default:
            // We cannot do same for stop because it might be implied by fencing
            break;
    }
 
    pe_rsc_trace(rsc, "Creating notify actions for %s %s",
                 rsc->id, n_data->action);
 
    // Create notify actions for stop or demote
    if ((rsc->role != RSC_ROLE_STOPPED)
        && ((task == stop_rsc) || (task == action_demote))) {
 
        stop = find_first_action(rsc->actions, NULL, RSC_STOP, NULL);
 
        for (iter = rsc->running_on; iter != NULL; iter = iter->next) {
            pe_node_t *current_node = (pe_node_t *) iter->data;
 
            /* If a stop is a pseudo-action implied by fencing, don't try to
             * notify the node getting fenced.
             */
            if ((stop != NULL) && pcmk_is_set(stop->flags, pe_action_pseudo)
                && (current_node->details->unclean
                    || current_node->details->remote_requires_reset)) {
                continue;
            }
 
            new_notify_action(rsc, current_node, n_data->pre,
                              n_data->pre_done, n_data);
 
            if ((task == action_demote) || (stop == NULL)
                || pcmk_is_set(stop->flags, pe_action_optional)) {
                new_post_notify_action(rsc, current_node, n_data);
            }
        }
    }
 
    // Create notify actions for start or promote
    if ((rsc->next_role != RSC_ROLE_STOPPED)
        && ((task == start_rsc) || (task == action_promote))) {
 
        start = find_first_action(rsc->actions, NULL, RSC_START, NULL);
        if (start != NULL) {
            pe_action_t *remote_start = find_remote_start(start);
 
            if ((remote_start != NULL)
                && !pcmk_is_set(remote_start->flags, pe_action_runnable)) {
                /* Start and promote actions for a clone instance behind
                 * a Pacemaker Remote connection happen after the
                 * connection starts. If the connection start is blocked, do
                 * not schedule notifications for these actions.
                 */
                return;
            }
        }
        if (rsc->allocated_to == NULL) {
            pe_proc_err("Next role '%s' but %s is not allocated",
                        role2text(rsc->next_role), rsc->id);
            return;
        }
        if ((task != start_rsc) || (start == NULL)
            || pcmk_is_set(start->flags, pe_action_optional)) {
 
            new_notify_action(rsc, rsc->allocated_to, n_data->pre,
                              n_data->pre_done, n_data);
        }
        new_post_notify_action(rsc, rsc->allocated_to, n_data);
    }
}
 
void
pe__create_notifications(pe_resource_t *rsc, notify_data_t *n_data)
{
    if ((rsc == NULL) || (n_data == NULL)) {
        return;
    }
    collect_resource_data(rsc, true, n_data);
    add_notif_keys(rsc, n_data);
    create_notify_actions(rsc, n_data);
}
 
void
pe__free_notification_data(notify_data_t *n_data)
{
    if (n_data == NULL) {
        return;
    }
    g_list_free_full(n_data->stop, free);
    g_list_free_full(n_data->start, free);
    g_list_free_full(n_data->demote, free);
    g_list_free_full(n_data->promote, free);
    g_list_free_full(n_data->promoted, free);
    g_list_free_full(n_data->unpromoted, free);
    g_list_free_full(n_data->active, free);
    g_list_free_full(n_data->inactive, free);
    pcmk_free_nvpairs(n_data->keys);
    free(n_data);
}
 
void
pe__order_notifs_after_fencing(pe_action_t *stop, pe_resource_t *rsc,
                               pe_action_t *stonith_op)
{
    notify_data_t *n_data;
 
    crm_info("Ordering notifications for implied %s after fencing", stop->uuid);
    n_data = pe__clone_notif_pseudo_ops(rsc, RSC_STOP, NULL, stonith_op);
 
    if (n_data != NULL) {
        collect_resource_data(rsc, false, n_data);
        add_notify_env(n_data, "notify_stop_resource", rsc->id);
        add_notify_env(n_data, "notify_stop_uname", stop->node->details->uname);
        create_notify_actions(uber_parent(rsc), n_data);
        pe__free_notification_data(n_data);
    }
}