X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fcore%2Fstore_lookup.c;h=e2ae0669f3cdc64300d5a8d49ecc3b032deea49a;hb=643b6cdd66f789baac6a4f13d1466f7688e22670;hp=d4a3d6cccb83ba3612416faec7edd3b03995dedc;hpb=39a45905e0b237e458b1826ff9b4fad1c4a59550;p=sysdb.git

diff --git a/src/core/store_lookup.c b/src/core/store_lookup.c
index d4a3d6c..e2ae066 100644
--- a/src/core/store_lookup.c
+++ b/src/core/store_lookup.c
@@ -47,271 +47,394 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <limits.h>
+
 /*
  * private data types
  */
 
-/* match the name of something */
 typedef struct {
-	char    *name;
-	regex_t *name_re;
-} name_matcher_t;
-
-/* matcher base type */
-struct sdb_store_matcher {
-	sdb_object_t super;
-	/* type of the matcher */
-	int type;
-};
-#define M(m) ((sdb_store_matcher_t *)(m))
-
-/* logical operator matcher */
-typedef struct {
-	sdb_store_matcher_t super;
-
-	/* left and right hand operands */
-	sdb_store_matcher_t *left;
-	sdb_store_matcher_t *right;
-} op_matcher_t;
-#define OP_M(m) ((op_matcher_t *)(m))
+	sdb_store_matcher_t *m;
+	sdb_store_matcher_t *filter;
+	sdb_store_lookup_cb  cb;
+	void *user_data;
+} scan_iter_data_t;
 
-/* match any type of object by it's base information */
-typedef struct {
-	sdb_store_matcher_t super;
-
-	/* match by the name of the object */
-	name_matcher_t name;
-} obj_matcher_t;
-#define OBJ_M(m) ((obj_matcher_t *)(m))
+/*
+ * private helper functions
+ */
 
-/* match attributes */
-typedef struct {
-	obj_matcher_t super;
-	/* XXX: this needs to be more flexible;
-	 *      add support for type-specific operators */
-	name_matcher_t value;
-} attr_matcher_t;
-#define ATTR_M(m) ((attr_matcher_t *)(m))
-
-/* match services */
-typedef struct {
-	obj_matcher_t super;
-	/* match by attributes assigned to the service */
-	attr_matcher_t *attr;
-} service_matcher_t;
-#define SERVICE_M(m) ((service_matcher_t *)(m))
+static int
+scan_iter(sdb_store_obj_t *obj, void *user_data)
+{
+	scan_iter_data_t *d = user_data;
 
-/* match hosts */
-typedef struct {
-	obj_matcher_t super;
-	/* match by services assigned to the host */
-	service_matcher_t *service;
-	/* match by attributes assigned to the host */
-	attr_matcher_t *attr;
-} host_matcher_t;
-#define HOST_M(m) ((host_matcher_t *)(m))
+	if (sdb_store_matcher_matches(d->m, obj, d->filter))
+		return d->cb(obj, d->user_data);
+	return 0;
+} /* scan_iter */
 
 /*
  * matcher implementations
  */
 
 static int
-match_logical(sdb_store_matcher_t *m, sdb_store_base_t *obj);
-static int
-match_obj(sdb_store_matcher_t *m, sdb_store_base_t *obj);
-
-/* specific matchers */
-
-static int
-match_name(name_matcher_t *m, const char *name)
+match_string(string_matcher_t *m, const char *name)
 {
-	assert(m);
-
 	if ((! m->name) && (! m->name_re))
-		return 0;
+		return 1;
 
 	if (! name)
 		name = "";
 
 	if (m->name && strcasecmp(m->name, name))
-		return -1;
+		return 0;
 	if (m->name_re && regexec(m->name_re, name,
 					/* matches */ 0, NULL, /* flags = */ 0))
-		return -1;
-	return 0;
-} /* match_name */
+		return 0;
+	return 1;
+} /* match_string */
 
-/* match attribute specific values;
- * always call this function through match_obj() */
 static int
-match_attr(attr_matcher_t *m, sdb_store_base_t *obj)
+match_logical(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	assert(m && obj);
+	int status;
 
-	if (obj->type != SDB_ATTRIBUTE)
-		return -1;
+	assert((m->type == MATCHER_AND) || (m->type == MATCHER_OR));
+	assert(OP_M(m)->left && OP_M(m)->right);
 
-	{
-		sdb_attribute_t *attr = SDB_ATTR(obj);
-		char buf[sdb_data_strlen(&attr->value) + 1];
+	status = sdb_store_matcher_matches(OP_M(m)->left, obj, filter);
 
-		if (sdb_data_format(&attr->value, buf, sizeof(buf), SDB_UNQUOTED) <= 0)
-			return -1;
-		return match_name(&m->value, buf);
-	}
-} /* match_attr */
+	/* lazy evaluation */
+	if ((! status) && (m->type == MATCHER_AND))
+		return status;
+	else if (status && (m->type == MATCHER_OR))
+		return status;
+
+	return sdb_store_matcher_matches(OP_M(m)->right, obj, filter);
+} /* match_logical */
 
-/* match service specific values;
- * always call this function through match_obj() */
 static int
-match_service(service_matcher_t *m, sdb_store_base_t *obj)
+match_unary(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	sdb_llist_iter_t *iter;
+	assert(m->type == MATCHER_NOT);
+	assert(UOP_M(m)->op);
 
-	assert(m && obj);
+	return !sdb_store_matcher_matches(UOP_M(m)->op, obj, filter);
+} /* match_unary */
 
-	if (obj->type != SDB_SERVICE)
-		return -1;
+static int
+match_name(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	sdb_avltree_iter_t *iter = NULL;
+	int status = 0;
+
+	assert(m->type == MATCHER_NAME);
 
-	if (! m->attr)
+	if (obj->type == NAME_M(m)->obj_type)
+		return match_string(&NAME_M(m)->name, SDB_OBJ(obj)->name);
+	else if (obj->type != SDB_HOST)
 		return 0;
 
-	iter = sdb_llist_get_iter(SDB_STORE_OBJ(obj)->attributes);
-	while (sdb_llist_iter_has_next(iter)) {
-		sdb_store_base_t *attr = STORE_BASE(sdb_llist_iter_get_next(iter));
+	switch (NAME_M(m)->obj_type) {
+		case SDB_SERVICE:
+			iter = sdb_avltree_get_iter(HOST(obj)->services);
+			break;
+		case SDB_METRIC:
+			iter = sdb_avltree_get_iter(HOST(obj)->metrics);
+			break;
+		case SDB_ATTRIBUTE:
+			iter = sdb_avltree_get_iter(HOST(obj)->attributes);
+			break;
+	}
 
-		/* if any of the attributes matches we found a matching service */
-		if (! match_obj(M(m->attr), attr)) {
-			sdb_llist_iter_destroy(iter);
-			return 0;
+	while (sdb_avltree_iter_has_next(iter)) {
+		sdb_object_t *child = sdb_avltree_iter_get_next(iter);
+		if (filter && (! sdb_store_matcher_matches(filter, STORE_OBJ(child),
+						NULL)))
+			continue;
+		if (match_string(&NAME_M(m)->name, child->name)) {
+			status = 1;
+			break;
 		}
 	}
-	sdb_llist_iter_destroy(iter);
-	return -1;
-} /* match_service */
+	sdb_avltree_iter_destroy(iter);
+	return status;
+} /* match_name */
 
-/* match host specific values;
- * always call this function through match_obj() */
 static int
-match_host(host_matcher_t *m, sdb_store_base_t *obj)
+match_child(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	sdb_llist_iter_t *iter;
-	int status;
+	sdb_avltree_iter_t *iter = NULL;
+	int status = 0;
 
-	assert(m && obj);
+	assert((m->type == MATCHER_SERVICE)
+			|| (m->type == MATCHER_METRIC)
+			|| (m->type == MATCHER_ATTRIBUTE));
 
+	/* TODO: support all object types */
 	if (obj->type != SDB_HOST)
-		return -1;
-
-	if (m->service) {
-		iter = sdb_llist_get_iter(SDB_STORE_OBJ(obj)->children);
-		status = -1;
-	}
-	else {
-		iter = NULL;
-		status = 0;
-	}
-	while (sdb_llist_iter_has_next(iter)) {
-		sdb_store_base_t *service = STORE_BASE(sdb_llist_iter_get_next(iter));
+		return 0;
 
-		/* found a matching service */
-		if (! match_obj(M(m->service), service)) {
-			status = 0;
+	if (m->type == MATCHER_SERVICE)
+		iter = sdb_avltree_get_iter(HOST(obj)->services);
+	else if (m->type == MATCHER_METRIC)
+		iter = sdb_avltree_get_iter(HOST(obj)->metrics);
+	else if (m->type == SDB_ATTRIBUTE)
+		iter = sdb_avltree_get_iter(HOST(obj)->attributes);
+
+	while (sdb_avltree_iter_has_next(iter)) {
+		sdb_object_t *child = sdb_avltree_iter_get_next(iter);
+		if (filter && (! sdb_store_matcher_matches(filter,
+						STORE_OBJ(child), NULL)))
+			continue;
+
+		if (sdb_store_matcher_matches(CHILD_M(m)->m, obj, filter)) {
+			status = 1;
 			break;
 		}
 	}
-	sdb_llist_iter_destroy(iter);
-
-	if (status)
-		return status;
-	else if (! m->attr)
-		return 0;
+	sdb_avltree_iter_destroy(iter);
+	return status;
+} /* match_child */
 
-	iter = sdb_llist_get_iter(SDB_STORE_OBJ(obj)->attributes);
-	while (sdb_llist_iter_has_next(iter)) {
-		sdb_store_base_t *attr = STORE_BASE(sdb_llist_iter_get_next(iter));
+/*
+ * cmp_expr:
+ * Compare the values of two expressions when evaluating them using the
+ * specified stored object and filter. Returns a value less than, equal to, or
+ * greater than zero if the value of the first expression compares less than,
+ * equal to, or greater than the value of the second expression. Returns
+ * INT_MAX if any of the expressions could not be evaluated or if any of them
+ * evaluated to NULL.
+ */
+static int
+cmp_expr(sdb_store_expr_t *e1, sdb_store_expr_t *e2,
+		sdb_store_obj_t *obj, sdb_store_matcher_t *filter)
+{
+	sdb_data_t v1 = SDB_DATA_INIT, v2 = SDB_DATA_INIT;
+	int status;
 
-		/* if any attribute matches, we found a matching host */
-		if (! match_obj(M(m->attr), attr)) {
-			sdb_llist_iter_destroy(iter);
-			return 0;
-		}
+	if (sdb_store_expr_eval(e1, obj, &v1, filter))
+		return INT_MAX;
+	if (sdb_store_expr_eval(e2, obj, &v2, filter)) {
+		sdb_data_free_datum(&v1);
+		return INT_MAX;
 	}
-	sdb_llist_iter_destroy(iter);
-	return -1;
-} /* match_host */
 
-/* generic matchers */
+	if (sdb_data_isnull(&v1) || (sdb_data_isnull(&v2)))
+		status = INT_MAX;
+	else if (v1.type == v2.type)
+		status = sdb_data_cmp(&v1, &v2);
+	else
+		status = sdb_data_strcmp(&v1, &v2);
 
-enum {
-	MATCHER_OR,
-	MATCHER_AND,
-	MATCHER_ATTR,
-	MATCHER_SERVICE,
-	MATCHER_HOST,
-};
-
-typedef int (*matcher_cb)(sdb_store_matcher_t *, sdb_store_base_t *);
+	sdb_data_free_datum(&v1);
+	sdb_data_free_datum(&v2);
+	return status;
+} /* cmp_expr */
 
-/* this array needs to be indexable by the matcher types */
-static matcher_cb matchers[] = {
-	match_logical,
-	match_logical,
-	match_obj,
-	match_obj,
-	match_obj,
-};
+static int
+match_lt(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_LT);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status < 0);
+} /* match_lt */
 
 static int
-match_logical(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+match_le(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
 	int status;
+	assert(m->type == MATCHER_LE);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status <= 0);
+} /* match_le */
 
-	assert(m && obj);
-	assert(OP_M(m)->left && OP_M(m)->right);
+static int
+match_eq(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_EQ);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (! status);
+} /* match_eq */
 
-	status = sdb_store_matcher_matches(OP_M(m)->left, obj);
-	/* lazy evaluation */
-	if (status && (m->type == MATCHER_AND))
-		return status;
-	else if ((! status) && (m->type == MATCHER_OR))
-		return status;
+static int
+match_ne(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_NE);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && status;
+} /* match_ne */
 
-	return sdb_store_matcher_matches(OP_M(m)->right, obj);
-} /* match_logical */
+static int
+match_ge(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_GE);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status >= 0);
+} /* match_ge */
 
 static int
-match_obj(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+match_gt(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
 	int status;
+	assert(m->type == MATCHER_GT);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status > 0);
+} /* match_gt */
+
+static int
+match_in(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	sdb_data_t value = SDB_DATA_INIT, array = SDB_DATA_INIT;
+	int status = 1;
+
+	assert(m->type == MATCHER_IN);
 
-	assert(m && obj);
+	if ((sdb_store_expr_eval(CMP_M(m)->left, obj, &value, filter))
+			|| (sdb_store_expr_eval(CMP_M(m)->right, obj, &array, filter)))
+		status = 0;
 
-	status = match_name(&OBJ_M(m)->name, obj->super.name);
 	if (status)
-		return status;
+		status = sdb_data_inarray(&value, &array);
 
-	switch (m->type) {
-		case MATCHER_ATTR:
-			return match_attr(ATTR_M(m), obj);
-			break;
-		case MATCHER_SERVICE:
-			return match_service(SERVICE_M(m), obj);
-			break;
-		case MATCHER_HOST:
-			return match_host(HOST_M(m), obj);
-			break;
+	sdb_data_free_datum(&value);
+	sdb_data_free_datum(&array);
+	return status;
+} /* match_in */
+
+static int
+match_regex(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	sdb_data_t v = SDB_DATA_INIT;
+	int status = 0;
+
+	regex_t regex;
+	_Bool free_regex = 0;
+
+	assert((m->type == MATCHER_REGEX)
+			|| (m->type == MATCHER_NREGEX));
+
+	if (! CMP_M(m)->right->type) {
+		assert(CMP_M(m)->right->data.type == SDB_TYPE_REGEX);
+		regex = CMP_M(m)->right->data.data.re.regex;
 	}
-	return -1;
-} /* match_obj */
+	else {
+		sdb_data_t tmp = SDB_DATA_INIT;
+		char *raw;
+
+		if (sdb_store_expr_eval(CMP_M(m)->right, obj, &tmp, filter))
+			return 0;
+
+		if (tmp.type != SDB_TYPE_STRING) {
+			sdb_data_free_datum(&tmp);
+			return 0;
+		}
+
+		raw = tmp.data.string;
+		if (sdb_data_parse(raw, SDB_TYPE_REGEX, &tmp)) {
+			free(raw);
+			return 0;
+		}
+
+		regex = tmp.data.re.regex;
+		free_regex = 1;
+		free(tmp.data.re.raw);
+		free(raw);
+	}
+
+	if ((sdb_store_expr_eval(CMP_M(m)->left, obj, &v, filter))
+			|| (sdb_data_isnull(&v)))
+		status = 0;
+	else {
+		char value[sdb_data_strlen(&v) + 1];
+		if (sdb_data_format(&v, value, sizeof(value), SDB_UNQUOTED) < 0)
+			status = 0;
+		else if (! regexec(&regex, value, 0, NULL, 0))
+			status = 1;
+	}
+
+	if (free_regex)
+		regfree(&regex);
+	sdb_data_free_datum(&v);
+	if (m->type == MATCHER_NREGEX)
+		return !status;
+	return status;
+} /* match_regex */
+
+static int
+match_isnull(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	sdb_data_t v = SDB_DATA_INIT;
+	int status;
+
+	assert((m->type == MATCHER_ISNULL) || (m->type == MATCHER_ISNNULL));
+
+	/* TODO: this might hide real errors;
+	 * improve error reporting and propagation */
+	if (sdb_store_expr_eval(ISNULL_M(m)->expr, obj, &v, filter)
+			|| sdb_data_isnull(&v))
+		status = 1;
+	else
+		status = 0;
+
+	sdb_data_free_datum(&v);
+	if (m->type == MATCHER_ISNNULL)
+		return !status;
+	return status;
+} /* match_isnull */
+
+typedef int (*matcher_cb)(sdb_store_matcher_t *, sdb_store_obj_t *,
+		sdb_store_matcher_t *);
+
+/* this array needs to be indexable by the matcher types;
+ * -> update the enum in store-private.h when updating this */
+static matcher_cb
+matchers[] = {
+	match_logical,
+	match_logical,
+	match_unary,
+	match_name,
+	match_child,
+	match_child,
+	match_child,
+	match_lt,
+	match_le,
+	match_eq,
+	match_ne,
+	match_ge,
+	match_gt,
+	match_in,
+	match_regex,
+	match_regex,
+	match_isnull,
+	match_isnull,
+};
 
 /*
  * private matcher types
  */
 
-/* initializes a name matcher consuming two elements from ap */
+/* initializes a string matcher consuming two elements from ap */
 static int
-name_matcher_init(name_matcher_t *m, va_list ap)
+string_matcher_init(string_matcher_t *m, va_list ap)
 {
 	const char *name = va_arg(ap, const char *);
 	const char *name_re = va_arg(ap, const char *);
@@ -329,10 +452,10 @@ name_matcher_init(name_matcher_t *m, va_list ap)
 			return -1;
 	}
 	return 0;
-} /* name_matcher_init */
+} /* string_matcher_init */
 
 static void
-name_matcher_destroy(name_matcher_t *m)
+string_matcher_destroy(string_matcher_t *m)
 {
 	if (m->name)
 		free(m->name);
@@ -340,145 +463,136 @@ name_matcher_destroy(name_matcher_t *m)
 		regfree(m->name_re);
 		free(m->name_re);
 	}
-} /* name_matcher_destroy */
+} /* string_matcher_destroy */
 
-/* initializes an object matcher consuming two elements from ap */
+/* initializes a name matcher */
 static int
-obj_matcher_init(sdb_object_t *obj, va_list ap)
+name_matcher_init(sdb_object_t *obj, va_list ap)
 {
-	obj_matcher_t *m = OBJ_M(obj);
-	return name_matcher_init(&m->name, ap);
-} /* obj_matcher_init */
+	name_matcher_t *m = NAME_M(obj);
+	M(obj)->type = MATCHER_NAME;
+	return string_matcher_init(&m->name, ap);
+} /* name_matcher_init */
 
 static void
-obj_matcher_destroy(sdb_object_t *obj)
+name_matcher_destroy(sdb_object_t *obj)
 {
-	obj_matcher_t *m = OBJ_M(obj);
-	name_matcher_destroy(&m->name);
-} /* obj_matcher_destroy */
+	name_matcher_t *m = NAME_M(obj);
+	string_matcher_destroy(&m->name);
+} /* name_matcher_destroy */
 
 static int
-attr_matcher_init(sdb_object_t *obj, va_list ap)
+op_matcher_init(sdb_object_t *obj, va_list ap)
 {
-	attr_matcher_t *attr = ATTR_M(obj);
-	int status;
+	M(obj)->type = va_arg(ap, int);
+	if ((M(obj)->type != MATCHER_OR) && (M(obj)->type != MATCHER_AND))
+		return -1;
 
-	M(obj)->type = MATCHER_ATTR;
+	OP_M(obj)->left = va_arg(ap, sdb_store_matcher_t *);
+	sdb_object_ref(SDB_OBJ(OP_M(obj)->left));
+	OP_M(obj)->right = va_arg(ap, sdb_store_matcher_t *);
+	sdb_object_ref(SDB_OBJ(OP_M(obj)->right));
 
-	status = obj_matcher_init(obj, ap);
-	if (! status)
-		status = name_matcher_init(&attr->value, ap);
-	return status;
-} /* attr_matcher_init */
+	if ((! OP_M(obj)->left) || (! OP_M(obj)->right))
+		return -1;
+	return 0;
+} /* op_matcher_init */
 
 static void
-attr_matcher_destroy(sdb_object_t *obj)
+op_matcher_destroy(sdb_object_t *obj)
 {
-	attr_matcher_t *attr = ATTR_M(obj);
-
-	obj_matcher_destroy(obj);
-	name_matcher_destroy(&attr->value);
-} /* attr_matcher_destroy */
+	if (OP_M(obj)->left)
+		sdb_object_deref(SDB_OBJ(OP_M(obj)->left));
+	if (OP_M(obj)->right)
+		sdb_object_deref(SDB_OBJ(OP_M(obj)->right));
+} /* op_matcher_destroy */
 
 static int
-service_matcher_init(sdb_object_t *obj, va_list ap)
+child_matcher_init(sdb_object_t *obj, va_list ap)
 {
-	attr_matcher_t *attr;
-	int status;
-
-	M(obj)->type = MATCHER_SERVICE;
-
-	status = obj_matcher_init(obj, ap);
-	if (status)
-		return status;
+	M(obj)->type = va_arg(ap, int);
+	CHILD_M(obj)->m = va_arg(ap, sdb_store_matcher_t *);
 
-	attr = va_arg(ap, attr_matcher_t *);
+	if (! CHILD_M(obj)->m)
+		return -1;
 
-	sdb_object_ref(SDB_OBJ(attr));
-	SERVICE_M(obj)->attr = attr;
+	sdb_object_ref(SDB_OBJ(CHILD_M(obj)->m));
 	return 0;
-} /* service_matcher_init */
+} /* child_matcher_init */
 
 static void
-service_matcher_destroy(sdb_object_t *obj)
+child_matcher_destroy(sdb_object_t *obj)
 {
-	obj_matcher_destroy(obj);
-	sdb_object_deref(SDB_OBJ(SERVICE_M(obj)->attr));
-} /* service_matcher_destroy */
+	sdb_object_deref(SDB_OBJ(CHILD_M(obj)->m));
+} /* child_matcher_destroy */
 
 static int
-host_matcher_init(sdb_object_t *obj, va_list ap)
+cmp_matcher_init(sdb_object_t *obj, va_list ap)
 {
-	service_matcher_t *service;
-	attr_matcher_t *attr;
-	int status;
-
-	M(obj)->type = MATCHER_HOST;
-
-	status = obj_matcher_init(obj, ap);
-	if (status)
-		return status;
+	M(obj)->type = va_arg(ap, int);
 
-	service = va_arg(ap, service_matcher_t *);
-	attr = va_arg(ap, attr_matcher_t *);
+	CMP_M(obj)->left = va_arg(ap, sdb_store_expr_t *);
+	sdb_object_ref(SDB_OBJ(CMP_M(obj)->left));
+	CMP_M(obj)->right = va_arg(ap, sdb_store_expr_t *);
+	sdb_object_ref(SDB_OBJ(CMP_M(obj)->right));
 
-	sdb_object_ref(SDB_OBJ(service));
-	HOST_M(obj)->service = service;
-	sdb_object_ref(SDB_OBJ(attr));
-	HOST_M(obj)->attr = attr;
+	if ((! CMP_M(obj)->left) || (! CMP_M(obj)->right))
+		return -1;
 	return 0;
-} /* host_matcher_init */
+} /* cmp_matcher_init */
 
 static void
-host_matcher_destroy(sdb_object_t *obj)
+cmp_matcher_destroy(sdb_object_t *obj)
 {
-	obj_matcher_destroy(obj);
-	sdb_object_deref(SDB_OBJ(HOST_M(obj)->service));
-	sdb_object_deref(SDB_OBJ(HOST_M(obj)->attr));
-} /* host_matcher_destroy */
+	sdb_object_deref(SDB_OBJ(CMP_M(obj)->left));
+	sdb_object_deref(SDB_OBJ(CMP_M(obj)->right));
+} /* cmp_matcher_destroy */
 
 static int
-op_matcher_init(sdb_object_t *obj, va_list ap)
+uop_matcher_init(sdb_object_t *obj, va_list ap)
 {
 	M(obj)->type = va_arg(ap, int);
-	if ((M(obj)->type != MATCHER_OR) && (M(obj)->type != MATCHER_AND))
+	if (M(obj)->type != MATCHER_NOT)
 		return -1;
 
-	OP_M(obj)->left = va_arg(ap, sdb_store_matcher_t *);
-	sdb_object_ref(SDB_OBJ(OP_M(obj)->left));
-	OP_M(obj)->right = va_arg(ap, sdb_store_matcher_t *);
-	sdb_object_ref(SDB_OBJ(OP_M(obj)->right));
+	UOP_M(obj)->op = va_arg(ap, sdb_store_matcher_t *);
+	sdb_object_ref(SDB_OBJ(UOP_M(obj)->op));
 
-	if ((! OP_M(obj)->left) || (! OP_M(obj)->right))
+	if (! UOP_M(obj)->op)
 		return -1;
 	return 0;
-} /* op_matcher_init */
+} /* uop_matcher_init */
 
 static void
-op_matcher_destroy(sdb_object_t *obj)
+uop_matcher_destroy(sdb_object_t *obj)
 {
-	if (OP_M(obj)->left)
-		sdb_object_deref(SDB_OBJ(OP_M(obj)->left));
-	if (OP_M(obj)->right)
-		sdb_object_deref(SDB_OBJ(OP_M(obj)->right));
-} /* op_matcher_destroy */
+	if (UOP_M(obj)->op)
+		sdb_object_deref(SDB_OBJ(UOP_M(obj)->op));
+} /* uop_matcher_destroy */
 
-static sdb_type_t attr_type = {
-	/* size = */ sizeof(attr_matcher_t),
-	/* init = */ attr_matcher_init,
-	/* destroy = */ attr_matcher_destroy,
-};
+static int
+isnull_matcher_init(sdb_object_t *obj, va_list ap)
+{
+	M(obj)->type = va_arg(ap, int);
+	if ((M(obj)->type != MATCHER_ISNULL) && (M(obj)->type != MATCHER_ISNNULL))
+		return -1;
 
-static sdb_type_t service_type = {
-	/* size = */ sizeof(service_matcher_t),
-	/* init = */ service_matcher_init,
-	/* destroy = */ service_matcher_destroy,
-};
+	ISNULL_M(obj)->expr = va_arg(ap, sdb_store_expr_t *);
+	sdb_object_ref(SDB_OBJ(ISNULL_M(obj)->expr));
+	return 0;
+} /* isnull_matcher_init */
 
-static sdb_type_t host_type = {
-	/* size = */ sizeof(host_matcher_t),
-	/* init = */ host_matcher_init,
-	/* destroy = */ host_matcher_destroy,
+static void
+isnull_matcher_destroy(sdb_object_t *obj)
+{
+	sdb_object_deref(SDB_OBJ(ISNULL_M(obj)->expr));
+	ISNULL_M(obj)->expr = NULL;
+} /* isnull_matcher_destroy */
+
+static sdb_type_t name_type = {
+	/* size = */ sizeof(name_matcher_t),
+	/* init = */ name_matcher_init,
+	/* destroy = */ name_matcher_destroy,
 };
 
 static sdb_type_t op_type = {
@@ -487,34 +601,273 @@ static sdb_type_t op_type = {
 	/* destroy = */ op_matcher_destroy,
 };
 
+static sdb_type_t uop_type = {
+	/* size = */ sizeof(uop_matcher_t),
+	/* init = */ uop_matcher_init,
+	/* destroy = */ uop_matcher_destroy,
+};
+
+static sdb_type_t child_type = {
+	/* size = */ sizeof(child_matcher_t),
+	/* init = */ child_matcher_init,
+	/* destroy = */ child_matcher_destroy,
+};
+
+static sdb_type_t cmp_type = {
+	/* size = */ sizeof(cmp_matcher_t),
+	/* init = */ cmp_matcher_init,
+	/* destroy = */ cmp_matcher_destroy,
+};
+
+static sdb_type_t isnull_type = {
+	/* size = */ sizeof(isnull_matcher_t),
+	/* init = */ isnull_matcher_init,
+	/* destroy = */ isnull_matcher_destroy,
+};
+
 /*
  * public API
  */
 
 sdb_store_matcher_t *
-sdb_store_attr_matcher(const char *attr_name, const char *attr_name_re,
-		const char *attr_value, const char *attr_value_re)
+sdb_store_name_matcher(int type, const char *name, _Bool re)
 {
-	return M(sdb_object_create("attr-matcher", attr_type,
-				attr_name, attr_name_re, attr_value, attr_value_re));
-} /* sdb_store_attr_matcher */
+	sdb_store_matcher_t *m;
+
+	if (re)
+		m = M(sdb_object_create("name-matcher", name_type, NULL, name));
+	else
+		m = M(sdb_object_create("name-matcher", name_type, name, NULL));
+
+	if (! m)
+		return NULL;
+
+	NAME_M(m)->obj_type = type;
+	return m;
+} /* sdb_store_name_matcher */
+
+sdb_store_matcher_t *
+sdb_store_child_matcher(int type, sdb_store_matcher_t *m)
+{
+	if (type == SDB_SERVICE)
+		type = MATCHER_SERVICE;
+	else if (type == SDB_METRIC)
+		type = MATCHER_METRIC;
+	else if (type == SDB_ATTRIBUTE)
+		type = MATCHER_ATTRIBUTE;
+	else
+		return NULL;
+	return M(sdb_object_create("any-matcher", child_type, type, m));
+} /* sdb_store_child_matcher */
+
+sdb_store_matcher_t *
+sdb_store_lt_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("lt-matcher", cmp_type,
+				MATCHER_LT, left, right));
+} /* sdb_store_lt_matcher */
+
+sdb_store_matcher_t *
+sdb_store_le_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("le-matcher", cmp_type,
+				MATCHER_LE, left, right));
+} /* sdb_store_le_matcher */
+
+sdb_store_matcher_t *
+sdb_store_eq_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("eq-matcher", cmp_type,
+				MATCHER_EQ, left, right));
+} /* sdb_store_eq_matcher */
+
+sdb_store_matcher_t *
+sdb_store_ne_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("ne-matcher", cmp_type,
+				MATCHER_NE, left, right));
+} /* sdb_store_ne_matcher */
+
+sdb_store_matcher_t *
+sdb_store_ge_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("ge-matcher", cmp_type,
+				MATCHER_GE, left, right));
+} /* sdb_store_ge_matcher */
+
+sdb_store_matcher_t *
+sdb_store_gt_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("gt-matcher", cmp_type,
+				MATCHER_GT, left, right));
+} /* sdb_store_gt_matcher */
+
+sdb_store_matcher_t *
+sdb_store_in_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("in-matcher", cmp_type,
+				MATCHER_IN, left, right));
+} /* sdb_store_in_matcher */
+
+sdb_store_matcher_t *
+sdb_store_regex_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	if (! right->type) {
+		if ((right->data.type != SDB_TYPE_STRING)
+				&& (right->data.type != SDB_TYPE_REGEX))
+			return NULL;
+
+		if (right->data.type == SDB_TYPE_STRING) {
+			char *raw = right->data.data.string;
+			if (sdb_data_parse(raw, SDB_TYPE_REGEX, &right->data))
+				return NULL;
+			free(raw);
+		}
+	}
+	return M(sdb_object_create("regex-matcher", cmp_type,
+				MATCHER_REGEX, left, right));
+} /* sdb_store_regex_matcher */
 
 sdb_store_matcher_t *
-sdb_store_service_matcher(const char *service_name, const char *service_name_re,
-		sdb_store_matcher_t *attr_matcher)
+sdb_store_nregex_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right)
 {
-	return M(sdb_object_create("service-matcher", service_type,
-				service_name, service_name_re, attr_matcher));
-} /* sdb_store_service_matcher */
+	sdb_store_matcher_t *m = sdb_store_regex_matcher(left, right);
+	if (! m)
+		return NULL;
+	m->type = MATCHER_NREGEX;
+	return m;
+} /* sdb_store_nregex_matcher */
 
 sdb_store_matcher_t *
-sdb_store_host_matcher(const char *host_name, const char *host_name_re,
-		sdb_store_matcher_t *service_matcher,
-		sdb_store_matcher_t *attr_matcher)
+sdb_store_isnull_matcher(sdb_store_expr_t *expr)
 {
-	return M(sdb_object_create("host-matcher", host_type,
-				host_name, host_name_re, service_matcher, attr_matcher));
-} /* sdb_store_host_matcher */
+	return M(sdb_object_create("isnull-matcher", isnull_type,
+				MATCHER_ISNULL, expr));
+} /* sdb_store_isnull_matcher */
+
+sdb_store_matcher_t *
+sdb_store_isnnull_matcher(sdb_store_expr_t *expr)
+{
+	return M(sdb_object_create("isnull-matcher", isnull_type,
+				MATCHER_ISNNULL, expr));
+} /* sdb_store_isnnull_matcher */
+
+sdb_store_matcher_op_cb
+sdb_store_parse_matcher_op(const char *op)
+{
+	if (! strcasecmp(op, "<"))
+		return sdb_store_lt_matcher;
+	else if (! strcasecmp(op, "<="))
+		return sdb_store_le_matcher;
+	else if (! strcasecmp(op, "="))
+		return sdb_store_eq_matcher;
+	else if (! strcasecmp(op, "!="))
+		return sdb_store_ne_matcher;
+	else if (! strcasecmp(op, ">="))
+		return sdb_store_ge_matcher;
+	else if (! strcasecmp(op, ">"))
+		return sdb_store_gt_matcher;
+	else if (! strcasecmp(op, "=~"))
+		return sdb_store_regex_matcher;
+	else if (! strcasecmp(op, "!~"))
+		return sdb_store_nregex_matcher;
+	return NULL;
+} /* sdb_store_parse_matcher_op */
+
+int
+sdb_store_parse_object_type_plural(const char *name)
+{
+	if (! strcasecmp(name, "hosts"))
+		return SDB_HOST;
+	else if (! strcasecmp(name, "services"))
+		return SDB_SERVICE;
+	else if (! strcasecmp(name, "metrics"))
+		return SDB_METRIC;
+	return -1;
+} /* sdb_store_parse_object_type_plural */
+
+int
+sdb_store_parse_field_name(const char *name)
+{
+	if (! strcasecmp(name, "name"))
+		return SDB_FIELD_NAME;
+	else if (! strcasecmp(name, "last_update"))
+		return SDB_FIELD_LAST_UPDATE;
+	else if (! strcasecmp(name, "age"))
+		return SDB_FIELD_AGE;
+	else if (! strcasecmp(name, "interval"))
+		return SDB_FIELD_INTERVAL;
+	else if (! strcasecmp(name, "backend"))
+		return SDB_FIELD_BACKEND;
+	return -1;
+} /* sdb_store_parse_field_name */
+
+static sdb_store_matcher_t *
+maybe_inv_matcher(sdb_store_matcher_t *m, _Bool inv)
+{
+	sdb_store_matcher_t *tmp;
+
+	if ((! m) || (! inv))
+		return m;
+
+	tmp = sdb_store_inv_matcher(m);
+	/* pass ownership to the inverse matcher */
+	sdb_object_deref(SDB_OBJ(m));
+	return tmp;
+} /* maybe_inv_matcher */
+
+sdb_store_matcher_t *
+sdb_store_matcher_parse_cmp(const char *obj_type,
+		const char *op, sdb_store_expr_t *expr)
+{
+	int type = -1;
+	_Bool inv = 0;
+	_Bool re = 0;
+
+	sdb_data_t value = SDB_DATA_INIT;
+	sdb_store_matcher_t *m = NULL;
+
+	if (! strcasecmp(obj_type, "host"))
+		type = SDB_HOST;
+	else if (! strcasecmp(obj_type, "service"))
+		type = SDB_SERVICE;
+	else if (! strcasecmp(obj_type, "metric"))
+		type = SDB_METRIC;
+	else if (! strcasecmp(obj_type, "attribute"))
+		type = SDB_ATTRIBUTE;
+	else
+		return NULL;
+
+	/* XXX: this code sucks! */
+	if (! strcasecmp(op, "=")) {
+		/* nothing to do */
+	}
+	else if (! strcasecmp(op, "!=")) {
+		inv = 1;
+	}
+	else if (! strcasecmp(op, "=~")) {
+		re = 1;
+	}
+	else if (! strcasecmp(op, "!~")) {
+		inv = 1;
+		re = 1;
+	}
+	else
+		return NULL;
+
+	if (! expr)
+		return NULL;
+
+	if (sdb_store_expr_eval(expr, /* obj */ NULL, &value, /* filter */ NULL)
+			|| (value.type != SDB_TYPE_STRING)) {
+		sdb_data_free_datum(&value);
+		return NULL;
+	}
+
+	m = sdb_store_name_matcher(type, value.data.string, re);
+	sdb_data_free_datum(&value);
+	return maybe_inv_matcher(m, inv);
+} /* sdb_store_matcher_parse_cmp */
 
 sdb_store_matcher_t *
 sdb_store_dis_matcher(sdb_store_matcher_t *left, sdb_store_matcher_t *right)
@@ -530,18 +883,39 @@ sdb_store_con_matcher(sdb_store_matcher_t *left, sdb_store_matcher_t *right)
 				left, right));
 } /* sdb_store_con_matcher */
 
+sdb_store_matcher_t *
+sdb_store_inv_matcher(sdb_store_matcher_t *m)
+{
+	return M(sdb_object_create("inv-matcher", uop_type, MATCHER_NOT, m));
+} /* sdb_store_inv_matcher */
+
 int
-sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
+	if (filter && (! sdb_store_matcher_matches(filter, obj, NULL)))
+		return 0;
+
 	/* "NULL" always matches */
 	if ((! m) || (! obj))
-		return 0;
+		return 1;
 
 	if ((m->type < 0) || ((size_t)m->type >= SDB_STATIC_ARRAY_LEN(matchers)))
-		return -1;
+		return 0;
 
-	return matchers[m->type](m, obj);
+	return matchers[m->type](m, obj, filter);
 } /* sdb_store_matcher_matches */
 
+int
+sdb_store_scan(sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
+		sdb_store_lookup_cb cb, void *user_data)
+{
+	scan_iter_data_t data = { m, filter, cb, user_data };
+
+	if (! cb)
+		return -1;
+	return sdb_store_iterate(scan_iter, &data);
+} /* sdb_store_scan */
+
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */