group.c

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/*
 * Copyright 2004-2020 the Pacemaker project contributors
 *
 * The version control history for this file may have further details.
 *
 * This source code is licensed under the GNU Lesser General Public License
 * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
 */

#include <crm_internal.h>

#include <crm/pengine/rules.h>
#include <crm/pengine/status.h>
#include <crm/pengine/internal.h>
#include <crm/msg_xml.h>
#include <pe_status_private.h>

#define VARIANT_GROUP 1
#include "./variant.h"

gboolean
group_unpack(pe_resource_t * rsc, pe_working_set_t * data_set)
{
    xmlNode *xml_obj = rsc->xml;
    xmlNode *xml_native_rsc = NULL;
    group_variant_data_t *group_data = NULL;
    const char *group_ordered = g_hash_table_lookup(rsc->meta, XML_RSC_ATTR_ORDERED);
    const char *group_colocated = g_hash_table_lookup(rsc->meta, "collocated");
    const char *clone_id = NULL;

    pe_rsc_trace(rsc, "Processing resource %s...", rsc->id);

    group_data = calloc(1, sizeof(group_variant_data_t));
    group_data->num_children = 0;
    group_data->first_child = NULL;
    group_data->last_child = NULL;
    rsc->variant_opaque = group_data;

    // We don't actually need the null checks but it speeds up the common case
    if ((group_ordered == NULL)
        || (crm_str_to_boolean(group_ordered, &(group_data->ordered)) < 0)) {
        group_data->ordered = TRUE;
    }
    if ((group_colocated == NULL)
        || (crm_str_to_boolean(group_colocated, &(group_data->colocated)) < 0)) {
        group_data->colocated = TRUE;
    }

    clone_id = crm_element_value(rsc->xml, XML_RSC_ATTR_INCARNATION);

    for (xml_native_rsc = __xml_first_child_element(xml_obj); xml_native_rsc != NULL;
         xml_native_rsc = __xml_next_element(xml_native_rsc)) {
        if (crm_str_eq((const char *)xml_native_rsc->name, XML_CIB_TAG_RESOURCE, TRUE)) {
            pe_resource_t *new_rsc = NULL;

            crm_xml_add(xml_native_rsc, XML_RSC_ATTR_INCARNATION, clone_id);
            if (common_unpack(xml_native_rsc, &new_rsc, rsc, data_set) == FALSE) {
                pe_err("Failed unpacking resource %s", crm_element_value(xml_obj, XML_ATTR_ID));
                if (new_rsc != NULL && new_rsc->fns != NULL) {
                    new_rsc->fns->free(new_rsc);
                }
                continue;
            }

            group_data->num_children++;
            rsc->children = g_list_append(rsc->children, new_rsc);

            if (group_data->first_child == NULL) {
                group_data->first_child = new_rsc;
            }
            group_data->last_child = new_rsc;
            pe_rsc_trace(rsc, "Added %s member %s", rsc->id, new_rsc->id);
        }
    }

    if (group_data->num_children == 0) {
        pcmk__config_warn("Group %s does not have any children", rsc->id);
        return TRUE; // Allow empty groups, children can be added later
    }

    pe_rsc_trace(rsc, "Added %d children to resource %s...", group_data->num_children, rsc->id);

    return TRUE;
}

gboolean
group_active(pe_resource_t * rsc, gboolean all)
{
    gboolean c_all = TRUE;
    gboolean c_any = FALSE;
    GListPtr gIter = rsc->children;

    for (; gIter != NULL; gIter = gIter->next) {
        pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;

        if (child_rsc->fns->active(child_rsc, all)) {
            c_any = TRUE;
        } else {
            c_all = FALSE;
        }
    }

    if (c_any == FALSE) {
        return FALSE;
    } else if (all && c_all == FALSE) {
        return FALSE;
    }
    return TRUE;
}

static void
group_print_xml(pe_resource_t * rsc, const char *pre_text, long options, void *print_data)
{
    GListPtr gIter = rsc->children;
    char *child_text = crm_strdup_printf("%s     ", pre_text);

    status_print("%s<group id=\"%s\" ", pre_text, rsc->id);
    status_print("number_resources=\"%d\" ", g_list_length(rsc->children));
    status_print(">\n");

    for (; gIter != NULL; gIter = gIter->next) {
        pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;

        child_rsc->fns->print(child_rsc, child_text, options, print_data);
    }

    status_print("%s</group>\n", pre_text);
    free(child_text);
}

void
group_print(pe_resource_t * rsc, const char *pre_text, long options, void *print_data)
{
    char *child_text = NULL;
    GListPtr gIter = rsc->children;

    if (pre_text == NULL) {
        pre_text = " ";
    }

    if (options & pe_print_xml) {
        group_print_xml(rsc, pre_text, options, print_data);
        return;
    }

    child_text = crm_strdup_printf("%s    ", pre_text);

    status_print("%sResource Group: %s", pre_text ? pre_text : "", rsc->id);

    if (options & pe_print_html) {
        status_print("\n<ul>\n");

    } else if ((options & pe_print_log) == 0) {
        status_print("\n");
    }

    if (options & pe_print_brief) {
        print_rscs_brief(rsc->children, child_text, options, print_data, TRUE);

    } else {
        for (; gIter != NULL; gIter = gIter->next) {
            pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;

            if (options & pe_print_html) {
                status_print("<li>\n");
            }
            child_rsc->fns->print(child_rsc, child_text, options, print_data);
            if (options & pe_print_html) {
                status_print("</li>\n");
            }
        }
    }

    if (options & pe_print_html) {
        status_print("</ul>\n");
    }
    free(child_text);
}

PCMK__OUTPUT_ARGS("group", "unsigned int", "struct pe_resource_t *", "GListPtr")
int
pe__group_xml(pcmk__output_t *out, va_list args)
{
    unsigned int options = va_arg(args, unsigned int);
    pe_resource_t *rsc = va_arg(args, pe_resource_t *);
    GListPtr only_show G_GNUC_UNUSED = va_arg(args, GListPtr);

    GListPtr gIter = rsc->children;
    char *count = crm_itoa(g_list_length(gIter));

    int rc = pcmk_rc_no_output;
    gboolean printed_header = FALSE;

    for (; gIter != NULL; gIter = gIter->next) {
        pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;

        if (!printed_header) {
            printed_header = TRUE;

            rc = pe__name_and_nvpairs_xml(out, true, "group", 2
                                          , "id", rsc->id
                                          , "number_resources", count);
            free(count);
            CRM_ASSERT(rc == pcmk_rc_ok);
        }

        out->message(out, crm_map_element_name(child_rsc->xml), options, child_rsc, only_show);
    }

    if (printed_header) {
        pcmk__output_xml_pop_parent(out);
    }

    return rc;
}

PCMK__OUTPUT_ARGS("group", "unsigned int", "struct pe_resource_t *", "GListPtr")
int
pe__group_html(pcmk__output_t *out, va_list args)
{
    unsigned int options = va_arg(args, unsigned int);
    pe_resource_t *rsc = va_arg(args, pe_resource_t *);
    GListPtr only_show G_GNUC_UNUSED = va_arg(args, GListPtr);

    out->begin_list(out, NULL, NULL, "Resource Group: %s", rsc->id);

    if (options & pe_print_brief) {
        pe__rscs_brief_output(out, rsc->children, options, TRUE);

    } else {
        for (GListPtr gIter = rsc->children; gIter; gIter = gIter->next) {
            pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;
            out->message(out, crm_map_element_name(child_rsc->xml), options, child_rsc, only_show);
        }
    }

    out->end_list(out);

    return pcmk_rc_ok;
}

PCMK__OUTPUT_ARGS("group", "unsigned int", "struct pe_resource_t *", "GListPtr")
int
pe__group_text(pcmk__output_t *out, va_list args)
{
    unsigned int options = va_arg(args, unsigned int);
    pe_resource_t *rsc = va_arg(args, pe_resource_t *);
    GListPtr only_show G_GNUC_UNUSED = va_arg(args, GListPtr);

    out->begin_list(out, NULL, NULL, "Resource Group: %s", rsc->id);

    if (options & pe_print_brief) {
        pe__rscs_brief_output(out, rsc->children, options, TRUE);

    } else {
        for (GListPtr gIter = rsc->children; gIter; gIter = gIter->next) {
            pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;

            out->message(out, crm_map_element_name(child_rsc->xml), options, child_rsc, only_show);
        }
    }
    out->end_list(out);

    return pcmk_rc_ok;
}

void
group_free(pe_resource_t * rsc)
{
    CRM_CHECK(rsc != NULL, return);

    pe_rsc_trace(rsc, "Freeing %s", rsc->id);

    for (GListPtr gIter = rsc->children; gIter != NULL; gIter = gIter->next) {
        pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;

        CRM_ASSERT(child_rsc);
        pe_rsc_trace(child_rsc, "Freeing child %s", child_rsc->id);
        child_rsc->fns->free(child_rsc);
    }

    pe_rsc_trace(rsc, "Freeing child list");
    g_list_free(rsc->children);

    common_free(rsc);
}

enum rsc_role_e
group_resource_state(const pe_resource_t * rsc, gboolean current)
{
    enum rsc_role_e group_role = RSC_ROLE_UNKNOWN;
    GListPtr gIter = rsc->children;

    for (; gIter != NULL; gIter = gIter->next) {
        pe_resource_t *child_rsc = (pe_resource_t *) gIter->data;
        enum rsc_role_e role = child_rsc->fns->state(child_rsc, current);

        if (role > group_role) {
            group_role = role;
        }
    }

    pe_rsc_trace(rsc, "%s role: %s", rsc->id, role2text(group_role));
    return group_role;
}