1 files changed, 112 insertions, 0 deletions
diff --git a/include/crm/common/rules.h b/include/crm/common/rules.h
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+++ b/include/crm/common/rules.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2004-2024 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 PCMK__CRM_COMMON_RULES__H
+#define PCMK__CRM_COMMON_RULES__H
+
+#include <glib.h>                   // guint, GHashTable
+#include <regex.h>                  // regmatch_t
+#include <libxml/tree.h>            // xmlNode
+#include <crm/common/iso8601.h>     // crm_time_t
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*!
+ * \file
+ * \brief Scheduler API for rules
+ * \ingroup core
+ */
+
+/* Allowed subexpressions of a rule
+ * @COMPAT This should be made internal at an API compatibility break
+ */
+//!@{
+//! \deprecated For Pacemaker use only
+enum expression_type {
+    pcmk__condition_unknown   = 0,  // Unknown or invalid condition
+    pcmk__condition_rule      = 1,  // Nested rule
+    pcmk__condition_attribute = 2,  // Node attribute expression
+    pcmk__condition_location  = 3,  // Node location expression
+    pcmk__condition_datetime  = 5,  // Date/time expression
+    pcmk__condition_resource  = 7,  // Resource agent expression
+    pcmk__condition_operation = 8,  // Operation expression
+
+#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
+    not_expr        = pcmk__condition_unknown,
+    nested_rule     = pcmk__condition_rule,
+    attr_expr       = pcmk__condition_attribute,
+    loc_expr        = pcmk__condition_location,
+    role_expr       = 4,
+    time_expr       = pcmk__condition_datetime,
+    version_expr    = 6,
+    rsc_expr        = pcmk__condition_resource,
+    op_expr         = pcmk__condition_operation,
+#endif
+};
+//!@}
+
+//! Data used to evaluate a rule (any NULL items are ignored)
+typedef struct pcmk_rule_input {
+    // Used to evaluate date expressions
+    const crm_time_t *now; //!< Current time for rule evaluation purposes
+
+    // Used to evaluate resource type expressions
+    const char *rsc_standard;   //!< Resource standard that rule applies to
+    const char *rsc_provider;   //!< Resource provider that rule applies to
+    const char *rsc_agent;      //!< Resource agent that rule applies to
+
+    // Used to evaluate operation type expressions
+    const char *op_name;    //! Operation name that rule applies to
+    guint op_interval_ms;   //! Operation interval that rule applies to
+
+    // Remaining members are used to evaluate node attribute expressions
+
+    /*!
+     * Node attributes for rule evaluation purposes
+     *
+     * \note Though not const, this is used only with g_hash_table_lookup().
+     */
+    GHashTable *node_attrs;
+
+    // Remaining members are used only within location constraint rules
+
+    /*!
+     * Resource parameters that can be used as the reference value source
+     *
+     * \note Though not const, this is used only with g_hash_table_lookup().
+     */
+    GHashTable *rsc_params;
+
+    /*!
+     * Resource meta-attributes that can be used as the reference value source
+     *
+     * \note Though not const, this is used only with g_hash_table_lookup().
+     */
+    GHashTable *rsc_meta;
+
+    //! Resource ID to compare against a location constraint's resource pattern
+    const char *rsc_id;
+
+    //! Resource pattern submatches (as set by regexec()) for rsc_id
+    const regmatch_t *rsc_id_submatches;
+
+    //! Number of entries in rsc_id_submatches
+    int rsc_id_nmatches;
+} pcmk_rule_input_t;
+
+int pcmk_evaluate_rule(xmlNode *rule, const pcmk_rule_input_t *rule_input,
+                       crm_time_t *next_change);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // PCMK__CRM_COMMON_RULES__H