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/*
* Copyright 2011-2024 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.
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <crm_internal.h>
#include <stdio.h>
#include <crm/common/xml.h>
#include <crm/common/scheduler.h>
#include <crm/common/scheduler_internal.h>
#define OCF_RESKEY_PREFIX "OCF_RESKEY_"
#define LRM_TARGET_ENV OCF_RESKEY_PREFIX CRM_META "_" PCMK__META_ON_NODE
/*!
* \internal
* \brief Get the node name that should be used to set node attributes
*
* If given NULL, "auto", or "localhost" as an argument, check the environment
* to detect the node name that should be used to set node attributes. (The
* caller might not know the correct name, for example if the target is part of
* a bundle with \c PCMK_META_CONTAINER_ATTRIBUTE_TARGET set to
* \c PCMK_VALUE_HOST.)
*
* \param[in] name NULL, "auto" or "localhost" to check environment variables,
* or anything else to return NULL
*
* \return Node name that should be used for node attributes based on the
* environment if known, otherwise NULL
*/
const char *
pcmk__node_attr_target(const char *name)
{
if (name == NULL || pcmk__strcase_any_of(name, "auto", "localhost", NULL)) {
char buf[128] = OCF_RESKEY_PREFIX;
size_t offset = sizeof(OCF_RESKEY_PREFIX) - 1;
char *target_var = crm_meta_name(PCMK_META_CONTAINER_ATTRIBUTE_TARGET);
char *phys_var = crm_meta_name(PCMK__META_PHYSICAL_HOST);
const char *target = NULL;
const char *host_physical = NULL;
snprintf(buf + offset, sizeof(buf) - offset, "%s", target_var);
target = getenv(buf);
snprintf(buf + offset, sizeof(buf) - offset, "%s", phys_var);
host_physical = getenv(buf);
// It is important to use the name by which the scheduler knows us
if (host_physical
&& pcmk__str_eq(target, PCMK_VALUE_HOST, pcmk__str_casei)) {
name = host_physical;
} else {
const char *host_pcmk = getenv(LRM_TARGET_ENV);
if (host_pcmk) {
name = host_pcmk;
}
}
free(target_var);
free(phys_var);
// TODO? Call get_local_node_name() if name == NULL
// (currently would require linkage against libcrmcluster)
return name;
} else {
return NULL;
}
}
/*!
* \brief Return the name of the node attribute used as a promotion score
*
* \param[in] rsc_id Resource ID that promotion score is for (or NULL to
* check the OCF_RESOURCE_INSTANCE environment variable)
*
* \return Newly allocated string with the node attribute name (or NULL on
* error, including no ID or environment variable specified)
* \note It is the caller's responsibility to free() the result.
*/
char *
pcmk_promotion_score_name(const char *rsc_id)
{
if (pcmk__str_empty(rsc_id)) {
rsc_id = getenv("OCF_RESOURCE_INSTANCE");
if (pcmk__str_empty(rsc_id)) {
return NULL;
}
}
return crm_strdup_printf("master-%s", rsc_id);
}
/*!
* \internal
* \brief Get the value of a node attribute
*
* \param[in] node Node to get attribute for
* \param[in] name Name of node attribute to get
* \param[in] target If this is \c PCMK_VALUE_HOST and \p node is a guest
* (bundle) node, get the value from the guest's host,
* otherwise get the value from \p node itself
* \param[in] node_type If getting the value from \p node's host, this
* indicates whether to check the current or assigned host
*
* \return Value of \p name attribute for \p node
*/
const char *
pcmk__node_attr(const pcmk_node_t *node, const char *name, const char *target,
enum pcmk__rsc_node node_type)
{
const char *value = NULL; // Attribute value to return
const char *node_type_s = NULL; // Readable equivalent of node_type
const pcmk_node_t *host = NULL;
const pcmk_resource_t *container = NULL;
if ((node == NULL) || (name == NULL)) {
return NULL;
}
/* Check the node's own attributes unless this is a guest (bundle) node with
* the container host as the attribute target.
*/
if (!pcmk__is_guest_or_bundle_node(node)
|| !pcmk__str_eq(target, PCMK_VALUE_HOST, pcmk__str_casei)) {
value = g_hash_table_lookup(node->details->attrs, name);
crm_trace("%s='%s' on %s",
name, pcmk__s(value, ""), pcmk__node_name(node));
return value;
}
/* This resource needs attributes set for the container's host instead of
* for the container itself (useful when the container uses the host's
* storage).
*/
container = node->details->remote_rsc->container;
switch (node_type) {
case pcmk__rsc_node_assigned:
host = container->allocated_to;
if (host == NULL) {
crm_trace("Skipping %s lookup for %s because "
"its container %s is unassigned",
name, pcmk__node_name(node), container->id);
return NULL;
}
node_type_s = "assigned";
break;
case pcmk__rsc_node_current:
if (container->running_on != NULL) {
host = container->running_on->data;
}
if (host == NULL) {
crm_trace("Skipping %s lookup for %s because "
"its container %s is inactive",
name, pcmk__node_name(node), container->id);
return NULL;
}
node_type_s = "current";
break;
default:
// Add support for other enum pcmk__rsc_node values if needed
CRM_ASSERT(false);
break;
}
value = g_hash_table_lookup(host->details->attrs, name);
crm_trace("%s='%s' for %s on %s container host %s",
name, pcmk__s(value, ""), pcmk__node_name(node), node_type_s,
pcmk__node_name(host));
return value;
}

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