![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/core/memstore-private.h b/src/core/memstore-private.h
--- /dev/null
@@ -0,0 +1,264 @@
+/*
+ * SysDB - src/core/memstore-private.h
+ * Copyright (C) 2012-2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * private data structures used by the memstore module
+ */
+
+#ifndef SDB_CORE_MEMSTORE_PRIVATE_H
+#define SDB_CORE_MEMSTORE_PRIVATE_H 1
+
+#include "core/memstore.h"
+#include "core/store.h"
+#include "utils/avltree.h"
+
+#include <sys/types.h>
+#include <regex.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * core types
+ */
+
+struct sdb_memstore_obj {
+ sdb_object_t super;
+#define _name super.name
+
+ /* object type */
+ int type;
+
+ /* common meta information */
+ sdb_time_t last_update;
+ sdb_time_t interval; /* moving average */
+ char **backends;
+ size_t backends_num;
+ sdb_memstore_obj_t *parent;
+};
+#define STORE_OBJ(obj) ((sdb_memstore_obj_t *)(obj))
+#define STORE_CONST_OBJ(obj) ((const sdb_memstore_obj_t *)(obj))
+
+typedef struct {
+ sdb_memstore_obj_t super;
+
+ sdb_data_t value;
+} attr_t;
+#define ATTR(obj) ((attr_t *)(obj))
+#define CONST_ATTR(obj) ((const attr_t *)(obj))
+
+typedef struct {
+ sdb_memstore_obj_t super;
+
+ sdb_avltree_t *attributes;
+} service_t;
+#define SVC(obj) ((service_t *)(obj))
+#define CONST_SVC(obj) ((const service_t *)(obj))
+
+typedef struct {
+ sdb_memstore_obj_t super;
+
+ sdb_avltree_t *attributes;
+ struct {
+ char *type;
+ char *id;
+ } store;
+} metric_t;
+#define METRIC(obj) ((metric_t *)(obj))
+
+typedef struct {
+ sdb_memstore_obj_t super;
+
+ sdb_avltree_t *services;
+ sdb_avltree_t *metrics;
+ sdb_avltree_t *attributes;
+} host_t;
+#define HOST(obj) ((host_t *)(obj))
+#define CONST_HOST(obj) ((const host_t *)(obj))
+
+/* shortcuts for accessing service/host attributes */
+#define _last_update super.last_update
+#define _interval super.interval
+
+/*
+ * querying
+ */
+
+struct sdb_memstore_query {
+ sdb_object_t super;
+ sdb_ast_node_t *ast;
+ sdb_memstore_matcher_t *matcher;
+ sdb_memstore_matcher_t *filter;
+};
+#define QUERY(m) ((sdb_memstore_query_t *)(m))
+
+/*
+ * expressions
+ */
+
+enum {
+ TYPED_EXPR = -3, /* obj type stored in data.data.integer */
+ ATTR_VALUE = -2, /* attr name stored in data.data.string */
+ FIELD_VALUE = -1, /* field type stored in data.data.integer */
+ /* 0: const value (stored in data) */
+ /* >0: operator id */
+};
+
+struct sdb_memstore_expr {
+ sdb_object_t super;
+
+ int type; /* see above */
+ int data_type;
+
+ sdb_memstore_expr_t *left;
+ sdb_memstore_expr_t *right;
+
+ sdb_data_t data;
+};
+#define CONST_EXPR(v) { SDB_OBJECT_INIT, 0, (v).type, NULL, NULL, (v) }
+#define EXPR_TO_STRING(e) \
+ (((e)->type == TYPED_EXPR) ? "<typed>" \
+ : ((e)->type == ATTR_VALUE) ? "attribute" \
+ : ((e)->type == FIELD_VALUE) ? SDB_FIELD_TO_NAME((e)->data.data.integer) \
+ : ((e)->type == 0) ? "<constant>" \
+ : ((e)->type > 0) ? SDB_DATA_OP_TO_STRING((e)->type) \
+ : "<unknown>")
+
+/*
+ * matchers
+ */
+
+/* when adding to this, also update 'MATCHER_SYM' below and 'matchers' in
+ * memstore_lookup.c */
+enum {
+ MATCHER_OR,
+ MATCHER_AND,
+ MATCHER_NOT,
+ MATCHER_ANY,
+ MATCHER_ALL,
+ MATCHER_IN,
+
+ /* unary operators */
+ MATCHER_ISNULL,
+ MATCHER_ISTRUE,
+ MATCHER_ISFALSE,
+
+ /* ary operators */
+ MATCHER_LT,
+ MATCHER_LE,
+ MATCHER_EQ,
+ MATCHER_NE,
+ MATCHER_GE,
+ MATCHER_GT,
+ MATCHER_REGEX,
+ MATCHER_NREGEX,
+
+ /* a generic query */
+ MATCHER_QUERY,
+};
+
+#define MATCHER_SYM(t) \
+ (((t) == MATCHER_OR) ? "OR" \
+ : ((t) == MATCHER_AND) ? "AND" \
+ : ((t) == MATCHER_NOT) ? "NOT" \
+ : ((t) == MATCHER_ANY) ? "ANY" \
+ : ((t) == MATCHER_ALL) ? "ALL" \
+ : ((t) == MATCHER_IN) ? "IN" \
+ : ((t) == MATCHER_ISNULL) ? "IS NULL" \
+ : ((t) == MATCHER_ISTRUE) ? "IS TRUE" \
+ : ((t) == MATCHER_ISFALSE) ? "IS FALSE" \
+ : ((t) == MATCHER_LT) ? "<" \
+ : ((t) == MATCHER_LE) ? "<=" \
+ : ((t) == MATCHER_EQ) ? "=" \
+ : ((t) == MATCHER_NE) ? "!=" \
+ : ((t) == MATCHER_GE) ? ">=" \
+ : ((t) == MATCHER_GT) ? ">" \
+ : ((t) == MATCHER_REGEX) ? "=~" \
+ : ((t) == MATCHER_NREGEX) ? "!~" \
+ : ((t) == MATCHER_QUERY) ? "QUERY" \
+ : "UNKNOWN")
+
+/* matcher base type */
+struct sdb_memstore_matcher {
+ sdb_object_t super;
+ /* type of the matcher */
+ int type;
+};
+#define M(m) ((sdb_memstore_matcher_t *)(m))
+
+/* infix operator matcher */
+typedef struct {
+ sdb_memstore_matcher_t super;
+
+ /* left and right hand operands */
+ sdb_memstore_matcher_t *left;
+ sdb_memstore_matcher_t *right;
+} op_matcher_t;
+#define OP_M(m) ((op_matcher_t *)(m))
+
+/* unary operator matcher */
+typedef struct {
+ sdb_memstore_matcher_t super;
+
+ /* operand */
+ sdb_memstore_matcher_t *op;
+} uop_matcher_t;
+#define UOP_M(m) ((uop_matcher_t *)(m))
+
+/* iter matcher */
+typedef struct {
+ sdb_memstore_matcher_t super;
+ sdb_memstore_expr_t *iter;
+ sdb_memstore_matcher_t *m;
+} iter_matcher_t;
+#define ITER_M(m) ((iter_matcher_t *)(m))
+
+/* compare operator matcher */
+typedef struct {
+ sdb_memstore_matcher_t super;
+
+ /* left and right hand expressions */
+ sdb_memstore_expr_t *left;
+ sdb_memstore_expr_t *right;
+} cmp_matcher_t;
+#define CMP_M(m) ((cmp_matcher_t *)(m))
+
+typedef struct {
+ sdb_memstore_matcher_t super;
+ sdb_memstore_expr_t *expr;
+} unary_matcher_t;
+#define UNARY_M(m) ((unary_matcher_t *)(m))
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* ! SDB_CORE_MEMSTORE_H */
+
+/* vim: set tw=78 sw=4 ts=4 noexpandtab : */
+