crm_resource_ban.c
No OneTemporary
Actions

Size

16 KB

Referenced Files

None

Subscribers

None

crm_resource_ban.c
View Options

	/*
	* Copyright 2004-2021 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_resource.h>

	#define XPATH_MAX 1024

	static char *
	parse_cli_lifetime(pcmk__output_t out, const char move_lifetime)
	{
	char *later_s = NULL;
	crm_time_t *now = NULL;
	crm_time_t *later = NULL;
	crm_time_t *duration = NULL;

	if (move_lifetime == NULL) {
	return NULL;
	}

	duration = crm_time_parse_duration(move_lifetime);
	if (duration == NULL) {
	out->err(out, "Invalid duration specified: %s\n"
	"Please refer to https://en.wikipedia.org/wiki/ISO_8601#Durations "
	"for examples of valid durations", move_lifetime);
	return NULL;
	}

	now = crm_time_new(NULL);
	later = crm_time_add(now, duration);
	if (later == NULL) {
	out->err(out, "Unable to add %s to current time\n"
	"Please report to " PACKAGE_BUGREPORT " as possible bug",
	move_lifetime);
	crm_time_free(now);
	crm_time_free(duration);
	return NULL;
	}

	crm_time_log(LOG_INFO, "now ", now,
	crm_time_log_date \| crm_time_log_timeofday \| crm_time_log_with_timezone);
	crm_time_log(LOG_INFO, "later ", later,
	crm_time_log_date \| crm_time_log_timeofday \| crm_time_log_with_timezone);
	crm_time_log(LOG_INFO, "duration", duration, crm_time_log_date \| crm_time_log_timeofday);
	later_s = crm_time_as_string(later, crm_time_log_date \| crm_time_log_timeofday \| crm_time_log_with_timezone);
	out->info(out, "Migration will take effect until: %s", later_s);

	crm_time_free(duration);
	crm_time_free(later);
	crm_time_free(now);
	return later_s;
	}

	static const char *
	promoted_role_name(void)
	{
	/* This is a judgment call for what string to use. @TODO Ideally we'd
	* use the legacy string if the DC only supports that, and the new one
	* otherwise. Basing it on --enable-compat-2.0 is a decent guess.
	*/
	#ifdef PCMK__COMPAT_2_0
	return RSC_ROLE_PROMOTED_LEGACY_S;
	#else
	return RSC_ROLE_PROMOTED_S;
	#endif
	}

	// \return Standard Pacemaker return code
	int
	cli_resource_ban(pcmk__output_t out, const char rsc_id, const char *host,
	const char move_lifetime, GList allnodes, cib_t * cib_conn,
	int cib_options, gboolean promoted_role_only)
	{
	char *later_s = NULL;
	int rc = pcmk_rc_ok;
	xmlNode *fragment = NULL;
	xmlNode *location = NULL;

	if(host == NULL) {
	GList *n = allnodes;
	for(; n && rc == pcmk_rc_ok; n = n->next) {
	pe_node_t *target = n->data;

	rc = cli_resource_ban(out, rsc_id, target->details->uname, move_lifetime,
	NULL, cib_conn, cib_options, promoted_role_only);
	}
	return rc;
	}

	later_s = parse_cli_lifetime(out, move_lifetime);
	if(move_lifetime && later_s == NULL) {
	return EINVAL;
	}

	fragment = create_xml_node(NULL, XML_CIB_TAG_CONSTRAINTS);

	location = create_xml_node(fragment, XML_CONS_TAG_RSC_LOCATION);
	crm_xml_set_id(location, "cli-ban-%s-on-%s", rsc_id, host);

	out->info(out, "WARNING: Creating rsc_location constraint '%s' with a "
	"score of -INFINITY for resource %s on %s.\n\tThis will "
	"prevent %s from %s on %s until the constraint is removed "
	"using the clear option or by editing the CIB with an "
	"appropriate tool\n\tThis will be the case even if %s "
	"is the last node in the cluster",
	ID(location), rsc_id, host, rsc_id,
	(promoted_role_only? "being promoted" : "running"),
	host, host);

	crm_xml_add(location, XML_LOC_ATTR_SOURCE, rsc_id);
	if(promoted_role_only) {
	crm_xml_add(location, XML_RULE_ATTR_ROLE, promoted_role_name());
	} else {
	crm_xml_add(location, XML_RULE_ATTR_ROLE, RSC_ROLE_STARTED_S);
	}

	if (later_s == NULL) {
	/* Short form */
	crm_xml_add(location, XML_CIB_TAG_NODE, host);
	crm_xml_add(location, XML_RULE_ATTR_SCORE, CRM_MINUS_INFINITY_S);

	} else {
	xmlNode *rule = create_xml_node(location, XML_TAG_RULE);
	xmlNode *expr = create_xml_node(rule, XML_TAG_EXPRESSION);

	crm_xml_set_id(rule, "cli-ban-%s-on-%s-rule", rsc_id, host);
	crm_xml_add(rule, XML_RULE_ATTR_SCORE, CRM_MINUS_INFINITY_S);
	crm_xml_add(rule, XML_RULE_ATTR_BOOLEAN_OP, "and");

	crm_xml_set_id(expr, "cli-ban-%s-on-%s-expr", rsc_id, host);
	crm_xml_add(expr, XML_EXPR_ATTR_ATTRIBUTE, CRM_ATTR_UNAME);
	crm_xml_add(expr, XML_EXPR_ATTR_OPERATION, "eq");
	crm_xml_add(expr, XML_EXPR_ATTR_VALUE, host);
	crm_xml_add(expr, XML_EXPR_ATTR_TYPE, "string");

	expr = create_xml_node(rule, "date_expression");
	crm_xml_set_id(expr, "cli-ban-%s-on-%s-lifetime", rsc_id, host);
	crm_xml_add(expr, "operation", "lt");
	crm_xml_add(expr, "end", later_s);
	}

	crm_log_xml_notice(fragment, "Modify");
	rc = cib_conn->cmds->update(cib_conn, XML_CIB_TAG_CONSTRAINTS, fragment, cib_options);
	rc = pcmk_legacy2rc(rc);

	free_xml(fragment);
	free(later_s);
	return rc;
	}

	// \return Standard Pacemaker return code
	int
	cli_resource_prefer(pcmk__output_t out,const char rsc_id, const char *host,
	const char move_lifetime, cib_t cib_conn, int cib_options,
	gboolean promoted_role_only)
	{
	char *later_s = parse_cli_lifetime(out, move_lifetime);
	int rc = pcmk_rc_ok;
	xmlNode *location = NULL;
	xmlNode *fragment = NULL;

	if(move_lifetime && later_s == NULL) {
	return EINVAL;
	}

	if(cib_conn == NULL) {
	free(later_s);
	return ENOTCONN;
	}

	fragment = create_xml_node(NULL, XML_CIB_TAG_CONSTRAINTS);

	location = create_xml_node(fragment, XML_CONS_TAG_RSC_LOCATION);
	crm_xml_set_id(location, "cli-prefer-%s", rsc_id);

	crm_xml_add(location, XML_LOC_ATTR_SOURCE, rsc_id);
	if(promoted_role_only) {
	crm_xml_add(location, XML_RULE_ATTR_ROLE, promoted_role_name());
	} else {
	crm_xml_add(location, XML_RULE_ATTR_ROLE, RSC_ROLE_STARTED_S);
	}

	if (later_s == NULL) {
	/* Short form */
	crm_xml_add(location, XML_CIB_TAG_NODE, host);
	crm_xml_add(location, XML_RULE_ATTR_SCORE, CRM_INFINITY_S);

	} else {
	xmlNode *rule = create_xml_node(location, XML_TAG_RULE);
	xmlNode *expr = create_xml_node(rule, XML_TAG_EXPRESSION);

	crm_xml_set_id(rule, "cli-prefer-rule-%s", rsc_id);
	crm_xml_add(rule, XML_RULE_ATTR_SCORE, CRM_INFINITY_S);
	crm_xml_add(rule, XML_RULE_ATTR_BOOLEAN_OP, "and");

	crm_xml_set_id(expr, "cli-prefer-expr-%s", rsc_id);
	crm_xml_add(expr, XML_EXPR_ATTR_ATTRIBUTE, CRM_ATTR_UNAME);
	crm_xml_add(expr, XML_EXPR_ATTR_OPERATION, "eq");
	crm_xml_add(expr, XML_EXPR_ATTR_VALUE, host);
	crm_xml_add(expr, XML_EXPR_ATTR_TYPE, "string");

	expr = create_xml_node(rule, "date_expression");
	crm_xml_set_id(expr, "cli-prefer-lifetime-end-%s", rsc_id);
	crm_xml_add(expr, "operation", "lt");
	crm_xml_add(expr, "end", later_s);
	}

	crm_log_xml_info(fragment, "Modify");
	rc = cib_conn->cmds->update(cib_conn, XML_CIB_TAG_CONSTRAINTS, fragment, cib_options);
	rc = pcmk_legacy2rc(rc);

	free_xml(fragment);
	free(later_s);
	return rc;
	}

	/* Nodes can be specified two different ways in the CIB, so we have two different
	* functions to try clearing out any constraints on them:
	*
	* (1) The node could be given by attribute=/value= in an expression XML node.
	* That's what resource_clear_node_in_expr handles. That XML looks like this:
	*
	* <rsc_location id="cli-prefer-dummy" rsc="dummy" role="Started">
	* <rule id="cli-prefer-rule-dummy" score="INFINITY" boolean-op="and">
	* <expression id="cli-prefer-expr-dummy" attribute="#uname" operation="eq" value="test02" type="string"/>
	* <date_expression id="cli-prefer-lifetime-end-dummy" operation="lt" end="2018-12-12 14:05:37 -05:00"/>
	* </rule>
	* </rsc_location>
	*
	* (2) The mode could be given by node= in an rsc_location XML node. That's
	* what resource_clear_node_in_location handles. That XML looks like this:
	*
	* <rsc_location id="cli-prefer-dummy" rsc="dummy" role="Started" node="node1" score="INFINITY"/>
	*
	* \return Standard Pacemaker return code
	*/
	static int
	resource_clear_node_in_expr(const char rsc_id, const char host, cib_t * cib_conn,
	int cib_options)
	{
	int rc = pcmk_rc_ok;
	char *xpath_string = NULL;

	xpath_string = crm_strdup_printf("//rsc_location[@id='cli-prefer-%s'][rule[@id='cli-prefer-rule-%s']/expression[@attribute='#uname' and @value='%s']]",
	rsc_id, rsc_id, host);

	rc = cib_conn->cmds->remove(cib_conn, xpath_string, NULL, cib_xpath \| cib_options);
	if (rc == -ENXIO) {
	rc = pcmk_rc_ok;
	} else {
	rc = pcmk_legacy2rc(rc);
	}

	free(xpath_string);
	return rc;
	}

	// \return Standard Pacemaker return code
	static int
	resource_clear_node_in_location(const char rsc_id, const char host, cib_t * cib_conn,
	int cib_options, bool clear_ban_constraints, gboolean force)
	{
	int rc = pcmk_rc_ok;
	xmlNode *fragment = NULL;
	xmlNode *location = NULL;

	fragment = create_xml_node(NULL, XML_CIB_TAG_CONSTRAINTS);

	if (clear_ban_constraints == TRUE) {
	location = create_xml_node(fragment, XML_CONS_TAG_RSC_LOCATION);
	crm_xml_set_id(location, "cli-ban-%s-on-%s", rsc_id, host);
	}

	location = create_xml_node(fragment, XML_CONS_TAG_RSC_LOCATION);
	crm_xml_set_id(location, "cli-prefer-%s", rsc_id);
	if (force == FALSE) {
	crm_xml_add(location, XML_CIB_TAG_NODE, host);
	}

	crm_log_xml_info(fragment, "Delete");
	rc = cib_conn->cmds->remove(cib_conn, XML_CIB_TAG_CONSTRAINTS, fragment, cib_options);
	if (rc == -ENXIO) {
	rc = pcmk_rc_ok;
	} else {
	rc = pcmk_legacy2rc(rc);
	}

	free_xml(fragment);
	return rc;
	}

	// \return Standard Pacemaker return code
	int
	cli_resource_clear(const char rsc_id, const char host, GList allnodes, cib_t cib_conn,
	int cib_options, bool clear_ban_constraints, gboolean force)
	{
	int rc = pcmk_rc_ok;

	if(cib_conn == NULL) {
	return ENOTCONN;
	}

	if (host) {
	rc = resource_clear_node_in_expr(rsc_id, host, cib_conn, cib_options);

	/* rc does not tell us whether the previous operation did anything, only
	* whether it failed or not. Thus, as long as it did not fail, we need
	* to try the second clear method.
	*/
	if (rc == pcmk_rc_ok) {
	rc = resource_clear_node_in_location(rsc_id, host, cib_conn,
	cib_options, clear_ban_constraints,
	force);
	}

	} else {
	GList *n = allnodes;

	/* Iterate over all nodes, attempting to clear the constraint from each.
	* On the first error, abort.
	*/
	for(; n; n = n->next) {
	pe_node_t *target = n->data;

	rc = cli_resource_clear(rsc_id, target->details->uname, NULL,
	cib_conn, cib_options, clear_ban_constraints,
	force);
	if (rc != pcmk_rc_ok) {
	break;
	}
	}
	}

	return rc;
	}

	static char *
	build_clear_xpath_string(xmlNode constraint_node, const char rsc, const char *node, gboolean promoted_role_only)
	{
	int offset = 0;
	char *xpath_string = NULL;
	char *first_half = NULL;
	char *rsc_role_substr = NULL;
	char *date_substr = NULL;

	if (pcmk__starts_with(ID(constraint_node), "cli-ban-")) {
	date_substr = crm_strdup_printf("//date_expression[@id='%s-lifetime']",
	ID(constraint_node));

	} else if (pcmk__starts_with(ID(constraint_node), "cli-prefer-")) {
	date_substr = crm_strdup_printf("//date_expression[@id='cli-prefer-lifetime-end-%s']",
	crm_element_value(constraint_node, "rsc"));
	} else {
	return NULL;
	}

	first_half = calloc(1, XPATH_MAX);
	offset += snprintf(first_half + offset, XPATH_MAX - offset, "//rsc_location");

	if (node != NULL \|\| rsc != NULL \|\| promoted_role_only == TRUE) {
	offset += snprintf(first_half + offset, XPATH_MAX - offset, "[");

	if (node != NULL) {
	if (rsc != NULL \|\| promoted_role_only == TRUE) {
	offset += snprintf(first_half + offset, XPATH_MAX - offset, "@node='%s' and ", node);
	} else {
	offset += snprintf(first_half + offset, XPATH_MAX - offset, "@node='%s'", node);
	}
	}

	if (rsc != NULL && promoted_role_only == TRUE) {
	rsc_role_substr = crm_strdup_printf("@rsc='%s' and @role='%s'",
	rsc, promoted_role_name());
	offset += snprintf(first_half + offset, XPATH_MAX - offset,
	"@rsc='%s' and @role='%s']",
	rsc, promoted_role_name());
	} else if (rsc != NULL) {
	rsc_role_substr = crm_strdup_printf("@rsc='%s'", rsc);
	offset += snprintf(first_half + offset, XPATH_MAX - offset, "@rsc='%s']", rsc);
	} else if (promoted_role_only == TRUE) {
	rsc_role_substr = crm_strdup_printf("@role='%s'",
	promoted_role_name());
	offset += snprintf(first_half + offset, XPATH_MAX - offset,
	"@role='%s']", promoted_role_name());
	} else {
	offset += snprintf(first_half + offset, XPATH_MAX - offset, "]");
	}
	}

	if (node != NULL) {
	if (rsc_role_substr != NULL) {
	xpath_string = crm_strdup_printf("%s\|//rsc_location[%s]/rule[expression[@attribute='#uname' and @value='%s']]%s",
	first_half, rsc_role_substr, node, date_substr);
	} else {
	xpath_string = crm_strdup_printf("%s\|//rsc_location/rule[expression[@attribute='#uname' and @value='%s']]%s",
	first_half, node, date_substr);
	}
	} else {
	xpath_string = crm_strdup_printf("%s%s", first_half, date_substr);
	}

	free(first_half);
	free(date_substr);
	free(rsc_role_substr);

	return xpath_string;
	}

	// \return Standard Pacemaker return code
	int
	cli_resource_clear_all_expired(xmlNode root, cib_t cib_conn, int cib_options,
	const char rsc, const char node, gboolean promoted_role_only)
	{
	xmlXPathObject *xpathObj = NULL;
	xmlNode *cib_constraints = NULL;
	crm_time_t *now = crm_time_new(NULL);
	int i;
	int rc = pcmk_rc_ok;

	cib_constraints = pcmk_find_cib_element(root, XML_CIB_TAG_CONSTRAINTS);
	xpathObj = xpath_search(cib_constraints, "//" XML_CONS_TAG_RSC_LOCATION);

	for (i = 0; i < numXpathResults(xpathObj); i++) {
	xmlNode *constraint_node = getXpathResult(xpathObj, i);
	xmlNode *date_expr_node = NULL;
	crm_time_t *end = NULL;
	char *xpath_string = NULL;

	xpath_string = build_clear_xpath_string(constraint_node, rsc, node, promoted_role_only);
	if (xpath_string == NULL) {
	continue;
	}

	date_expr_node = get_xpath_object(xpath_string, constraint_node, LOG_DEBUG);
	if (date_expr_node == NULL) {
	free(xpath_string);
	continue;
	}

	/* And then finally, see if the date expression is expired. If so,
	* clear the constraint.
	*/
	end = crm_time_new(crm_element_value(date_expr_node, "end"));

	if (crm_time_compare(now, end) == 1) {
	xmlNode *fragment = NULL;
	xmlNode *location = NULL;

	fragment = create_xml_node(NULL, XML_CIB_TAG_CONSTRAINTS);
	location = create_xml_node(fragment, XML_CONS_TAG_RSC_LOCATION);
	crm_xml_set_id(location, "%s", ID(constraint_node));
	crm_log_xml_info(fragment, "Delete");

	rc = cib_conn->cmds->remove(cib_conn, XML_CIB_TAG_CONSTRAINTS,
	fragment, cib_options);
	rc = pcmk_legacy2rc(rc);

	if (rc != pcmk_rc_ok) {
	free(xpath_string);
	goto done;
	}

	free_xml(fragment);
	}

	crm_time_free(end);
	free(xpath_string);
	}

	done:
	freeXpathObject(xpathObj);
	crm_time_free(now);
	return rc;
	}

File Metadata

Mime Type: text/x-c
Expires: Tue, Oct 29, 8:26 PM (1 d, 21 h)
Storage Engine: blob
Storage Format: Raw Data
Storage Handle: 933077
Default Alt Text: crm_resource_ban.c (16 KB)

crm_resource_ban.cNo OneTemporaryActions

crm_resource_ban.cView Options

File Metadata

Event Timeline

crm_resource_ban.c
No OneTemporary
Actions

crm_resource_ban.c
View Options