X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fcore%2Fstore_lookup.c;h=4e777d863f2dbed1a2433da46bf27bd8e62c55e9;hb=d4a8da24750a0547a6b6af29853f519869bb9a53;hp=b5c936aae355419eadf52dfd7e1c99110e38701f;hpb=c659b3f0b772cd479654eb41be2a4d71965d2795;p=sysdb.git

diff --git a/src/core/store_lookup.c b/src/core/store_lookup.c
index b5c936a..4e777d8 100644
--- a/src/core/store_lookup.c
+++ b/src/core/store_lookup.c
@@ -47,46 +47,138 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <limits.h>
+
 /*
  * private data types
  */
 
 typedef struct {
 	sdb_store_matcher_t *m;
+	sdb_store_matcher_t *filter;
 	sdb_store_lookup_cb  cb;
 	void *user_data;
-} lookup_iter_data_t;
+} scan_iter_data_t;
 
 /*
  * private helper functions
  */
 
 static int
-lookup_iter(sdb_store_base_t *obj, void *user_data)
+scan_iter(sdb_store_obj_t *obj, void *user_data)
 {
-	lookup_iter_data_t *d = user_data;
+	scan_iter_data_t *d = user_data;
 
-	if (sdb_store_matcher_matches(d->m, obj))
+	if (sdb_store_matcher_matches(d->m, obj, d->filter))
 		return d->cb(obj, d->user_data);
 	return 0;
-} /* lookup_iter */
+} /* scan_iter */
+
+static sdb_attribute_t *
+attr_get(sdb_host_t *host, const char *name, sdb_store_matcher_t *filter)
+{
+	sdb_avltree_iter_t *iter = NULL;
+	sdb_attribute_t *attr = NULL;
+
+	iter = sdb_avltree_get_iter(host->attributes);
+	while (sdb_avltree_iter_has_next(iter)) {
+		sdb_attribute_t *a = ATTR(sdb_avltree_iter_get_next(iter));
+
+		if (strcasecmp(name, SDB_OBJ(a)->name))
+			continue;
+
+		assert(STORE_OBJ(a)->type == SDB_ATTRIBUTE);
+		attr = a;
+		break;
+	}
+	sdb_avltree_iter_destroy(iter);
+
+	if (filter && (! sdb_store_matcher_matches(filter, STORE_OBJ(attr),
+					NULL)))
+		return NULL;
+	return attr;
+} /* attr_get */
 
 /*
- * matcher implementations
+ * conditional implementations
  */
 
 static int
-match_logical(sdb_store_matcher_t *m, sdb_store_base_t *obj);
+attr_cmp(sdb_store_obj_t *obj, sdb_store_cond_t *cond,
+		sdb_store_matcher_t *filter)
+{
+	sdb_attribute_t *attr;
+	sdb_data_t value = SDB_DATA_INIT;
+	int status;
+
+	if (obj->type != SDB_HOST)
+		return INT_MAX;
+
+	if (sdb_store_expr_eval(ATTR_C(cond)->expr, obj, &value, filter))
+		return INT_MAX;
+
+	attr = attr_get(HOST(obj), ATTR_C(cond)->name, filter);
+	if (! attr)
+		status = INT_MAX;
+	else if (attr->value.type != value.type)
+		status = sdb_data_strcmp(&attr->value, &value);
+	else
+		status = sdb_data_cmp(&attr->value, &value);
+	sdb_data_free_datum(&value);
+	return status;
+} /* attr_cmp */
+
 static int
-match_unary(sdb_store_matcher_t *m, sdb_store_base_t *obj);
+obj_cmp(sdb_store_obj_t *obj, sdb_store_cond_t *cond,
+		sdb_store_matcher_t *filter)
+{
+	sdb_data_t obj_value = SDB_DATA_INIT;
+	sdb_data_t value = SDB_DATA_INIT;
+	int status;
 
-/* specific matchers */
+	if (sdb_store_expr_eval(OBJ_C(cond)->expr, obj, &value, filter))
+		return INT_MAX;
+
+	if (OBJ_C(cond)->field == SDB_FIELD_BACKEND) {
+		/* this implementation is not actually a conditional but rather checks
+		 * for equality (or rather, existence) only */
+		size_t i;
+
+		if (value.type != SDB_TYPE_STRING)
+			return INT_MAX;
+
+		status = INT_MAX;
+		for (i = 0; i < obj->backends_num; ++i) {
+			if (! strcasecmp(obj->backends[i], value.data.string)) {
+				status = 0;
+				break;
+			}
+		}
+		sdb_data_free_datum(&value);
+		return status;
+	}
+
+	if (sdb_store_get_field(obj, OBJ_C(cond)->field, &obj_value))
+		return INT_MAX;
+	if (obj_value.type != value.type) {
+		sdb_data_free_datum(&obj_value);
+		sdb_data_free_datum(&value);
+		return INT_MAX;
+	}
+
+	status = sdb_data_cmp(&obj_value, &value);
+	sdb_data_free_datum(&obj_value);
+	sdb_data_free_datum(&value);
+	return status;
+} /* obj_cmp */
+
+/*
+ * matcher implementations
+ */
 
 static int
 match_string(string_matcher_t *m, const char *name)
 {
-	assert(m);
-
 	if ((! m->name) && (! m->name_re))
 		return 1;
 
@@ -101,194 +193,328 @@ match_string(string_matcher_t *m, const char *name)
 	return 1;
 } /* match_string */
 
-static char *
-string_tostring(string_matcher_t *m, char *buf, size_t buflen)
-{
-	snprintf(buf, buflen, "{ %s%s%s, %p }",
-			m->name ? "'" : "", m->name ? m->name : "NULL", m->name ? "'" : "",
-			m->name_re);
-	return buf;
-} /* string_tostring */
-
-static char *
-logical_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+static int
+match_logical(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	char left[buflen + 1], right[buflen + 1];
-
-	if (! m) {
-		/* this should not happen */
-		snprintf(buf, buflen, "()");
-		return buf;
-	}
-
-	assert((m->type == MATCHER_OR) || (m->type == MATCHER_AND));
-	snprintf(buf, buflen, "(%s, %s, %s)",
-			m->type == MATCHER_OR ? "OR" : "AND",
-			sdb_store_matcher_tostring(OP_M(m)->left, left, sizeof(left)),
-			sdb_store_matcher_tostring(OP_M(m)->right, right, sizeof(right)));
-	return buf;
-} /* logical_tostring */
+	int status;
 
-static char *
-unary_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
-{
-	char op[buflen + 1];
+	assert((m->type == MATCHER_AND) || (m->type == MATCHER_OR));
+	assert(OP_M(m)->left && OP_M(m)->right);
 
-	if (! m) {
-		/* this should not happen */
-		snprintf(buf, buflen, "()");
-		return buf;
-	}
+	status = sdb_store_matcher_matches(OP_M(m)->left, obj, filter);
 
-	assert(m->type == MATCHER_NOT);
-	snprintf(buf, buflen, "(NOT, %s)",
-			sdb_store_matcher_tostring(UOP_M(m)->op, op, sizeof(op)));
-	return buf;
-} /* unary_tostring */
+	/* lazy evaluation */
+	if ((! status) && (m->type == MATCHER_AND))
+		return status;
+	else if (status && (m->type == MATCHER_OR))
+		return status;
 
-static char *
-name_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
-{
-	char name[buflen + 1];
-	assert(m->type == MATCHER_NAME);
-	snprintf(buf, buflen, "OBJ[%s]{ NAME%s }",
-			SDB_STORE_TYPE_TO_NAME(NAME_M(m)->obj_type),
-			string_tostring(&NAME_M(m)->name, name, sizeof(name)));
-	return buf;
-} /* name_tostring */
+	return sdb_store_matcher_matches(OP_M(m)->right, obj, filter);
+} /* match_logical */
 
-static char *
-attr_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+static int
+match_unary(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	char value[buflen + 1];
-
-	if (! m) {
-		snprintf(buf, buflen, "ATTR{}");
-		return buf;
-	}
+	assert(m->type == MATCHER_NOT);
+	assert(UOP_M(m)->op);
 
-	assert(m->type == MATCHER_ATTR);
-	snprintf(buf, buflen, "ATTR[%s]{ VALUE%s }", ATTR_M(m)->name,
-			string_tostring(&ATTR_M(m)->value, value, sizeof(value)));
-	return buf;
-} /* attr_tostring */
+	return !sdb_store_matcher_matches(UOP_M(m)->op, obj, filter);
+} /* match_unary */
 
 static int
-match_name(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+match_name(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	sdb_llist_iter_t *iter = NULL;
+	sdb_avltree_iter_t *iter = NULL;
 	int status = 0;
 
-	assert(m && obj);
 	assert(m->type == MATCHER_NAME);
 
-	if (obj->type != SDB_HOST)
+	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;
 
 	switch (NAME_M(m)->obj_type) {
-		case SDB_HOST:
-			return match_string(&NAME_M(m)->name, obj->super.name);
-			break;
 		case SDB_SERVICE:
-			iter = sdb_llist_get_iter(SDB_STORE_OBJ(obj)->children);
+			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_llist_get_iter(SDB_STORE_OBJ(obj)->attributes);
+			iter = sdb_avltree_get_iter(HOST(obj)->attributes);
 			break;
 	}
 
-	while (sdb_llist_iter_has_next(iter)) {
-		sdb_store_base_t *child = STORE_BASE(sdb_llist_iter_get_next(iter));
-		if (match_string(&NAME_M(m)->name, child->super.name)) {
+	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);
+	sdb_avltree_iter_destroy(iter);
 	return status;
 } /* match_name */
 
 static int
-match_attr(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+match_attr(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
 {
-	sdb_llist_iter_t *iter = NULL;
-	int status = 0;
+	sdb_attribute_t *attr;
 
-	assert(m && obj);
 	assert(m->type == MATCHER_ATTR);
+	assert(ATTR_M(m)->name);
 
 	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_attribute_t *attr = SDB_ATTR(sdb_llist_iter_get_next(iter));
+	attr = attr_get(HOST(obj), ATTR_M(m)->name, filter);
+	if (attr) {
 		char buf[sdb_data_strlen(&attr->value) + 1];
-
-		if (ATTR_M(m)->name && strcasecmp(ATTR_M(m)->name, SDB_OBJ(attr)->name))
-			continue;
-
 		if (sdb_data_format(&attr->value, buf, sizeof(buf), SDB_UNQUOTED) <= 0)
 			return 0;
-		if (match_string(&ATTR_M(m)->value, buf)) {
-			status = 1;
-			break;
-		}
+		if (match_string(&ATTR_M(m)->value, buf))
+			return 1;
 	}
-	sdb_llist_iter_destroy(iter);
-	return status;
+	return 0;
 } /* match_attr */
 
-/* generic matchers */
+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 = COND_M(m)->cond->cmp(obj, COND_M(m)->cond, filter);
+	return (status != INT_MAX) && (status < 0);
+} /* match_lt */
+
+static int
+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 = COND_M(m)->cond->cmp(obj, COND_M(m)->cond, filter);
+	return (status != INT_MAX) && (status <= 0);
+} /* match_le */
+
+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 = COND_M(m)->cond->cmp(obj, COND_M(m)->cond, filter);
+	return (status != INT_MAX) && (! status);
+} /* match_eq */
+
+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 = COND_M(m)->cond->cmp(obj, COND_M(m)->cond, filter);
+	return (status != INT_MAX) && (status >= 0);
+} /* match_ge */
+
+static int
+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 = COND_M(m)->cond->cmp(obj, COND_M(m)->cond, filter);
+	return (status != INT_MAX) && (status > 0);
+} /* match_gt */
+
+/*
+ * 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.
+ */
+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 (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;
+	}
+
+	if (v1.type == v2.type)
+		status = sdb_data_cmp(&v1, &v2);
+	else
+		status = sdb_data_strcmp(&v1, &v2);
+
+	sdb_data_free_datum(&v1);
+	sdb_data_free_datum(&v2);
+	return status;
+} /* cmp_expr */
+
+static int
+match_cmp_lt(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_CMP_LT);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status < 0);
+} /* match_cmp_lt */
+
+static int
+match_cmp_le(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_CMP_LE);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status <= 0);
+} /* match_cmp_le */
+
+static int
+match_cmp_eq(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_CMP_EQ);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (! status);
+} /* match_cmp_eq */
+
+static int
+match_cmp_ge(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_CMP_GE);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status >= 0);
+} /* match_cmp_ge */
+
+static int
+match_cmp_gt(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	int status;
+	assert(m->type == MATCHER_CMP_GT);
+	status = cmp_expr(CMP_M(m)->left, CMP_M(m)->right, obj, filter);
+	return (status != INT_MAX) && (status > 0);
+} /* match_cmp_gt */
+
+static int
+match_isnull(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
+		sdb_store_matcher_t *filter)
+{
+	assert(m->type == MATCHER_ISNULL);
+	if (obj->type != SDB_HOST)
+		return 0;
+	return attr_get(HOST(obj), ISNULL_M(m)->attr_name, filter) == NULL;
+} /* match_isnull */
 
-typedef int (*matcher_cb)(sdb_store_matcher_t *, sdb_store_base_t *);
+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[] = {
+static matcher_cb
+matchers[] = {
 	match_logical,
 	match_logical,
 	match_unary,
 	match_name,
 	match_attr,
+	match_lt,
+	match_le,
+	match_eq,
+	match_ge,
+	match_gt,
+	match_cmp_lt,
+	match_cmp_le,
+	match_cmp_eq,
+	match_cmp_ge,
+	match_cmp_gt,
+	match_isnull,
 };
 
-typedef char *(*matcher_tostring_cb)(sdb_store_matcher_t *, char *, size_t);
-
-static matcher_tostring_cb matchers_tostring[] = {
-	logical_tostring,
-	logical_tostring,
-	unary_tostring,
-	name_tostring,
-	attr_tostring,
-};
+/*
+ * private conditional types
+ */
 
 static int
-match_logical(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+attr_cond_init(sdb_object_t *obj, va_list ap)
 {
-	int status;
+	const char *name = va_arg(ap, const char *);
+	sdb_store_expr_t *expr = va_arg(ap, sdb_store_expr_t *);
 
-	assert(m && obj);
-	assert(OP_M(m)->left && OP_M(m)->right);
+	if (! name)
+		return -1;
 
-	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;
+	SDB_STORE_COND(obj)->cmp = attr_cmp;
 
-	return sdb_store_matcher_matches(OP_M(m)->right, obj);
-} /* match_logical */
+	ATTR_C(obj)->name = strdup(name);
+	if (! ATTR_C(obj)->name)
+		return -1;
+	ATTR_C(obj)->expr = expr;
+	sdb_object_ref(SDB_OBJ(expr));
+	return 0;
+} /* attr_cond_init */
+
+static void
+attr_cond_destroy(sdb_object_t *obj)
+{
+	if (ATTR_C(obj)->name)
+		free(ATTR_C(obj)->name);
+	sdb_object_deref(SDB_OBJ(ATTR_C(obj)->expr));
+} /* attr_cond_destroy */
+
+static sdb_type_t attr_cond_type = {
+	/* size = */ sizeof(attr_cond_t),
+	/* init = */ attr_cond_init,
+	/* destroy = */ attr_cond_destroy,
+};
 
 static int
-match_unary(sdb_store_matcher_t *m, sdb_store_base_t *obj)
+obj_cond_init(sdb_object_t *obj, va_list ap)
 {
-	assert(m && obj);
-	assert(UOP_M(m)->op);
+	int field = va_arg(ap, int);
+	sdb_store_expr_t *expr = va_arg(ap, sdb_store_expr_t *);
 
-	return !sdb_store_matcher_matches(UOP_M(m)->op, obj);
-} /* match_unary */
+	SDB_STORE_COND(obj)->cmp = obj_cmp;
+
+	OBJ_C(obj)->field = field;
+	OBJ_C(obj)->expr = expr;
+	sdb_object_ref(SDB_OBJ(expr));
+	return 0;
+} /* obj_cond_init */
+
+static void
+obj_cond_destroy(sdb_object_t *obj)
+{
+	sdb_object_deref(SDB_OBJ(OBJ_C(obj)->expr));
+} /* obj_cond_destroy */
+
+static sdb_type_t obj_cond_type = {
+	/* size = */ sizeof(obj_cond_t),
+	/* init = */ obj_cond_init,
+	/* destroy = */ obj_cond_destroy,
+};
 
 /*
  * private matcher types
@@ -327,6 +553,15 @@ string_matcher_destroy(string_matcher_t *m)
 	}
 } /* string_matcher_destroy */
 
+static char *
+string_tostring(string_matcher_t *m, char *buf, size_t buflen)
+{
+	snprintf(buf, buflen, "{ %s%s%s, %p }",
+			m->name ? "'" : "", m->name ? m->name : "NULL", m->name ? "'" : "",
+			m->name_re);
+	return buf;
+} /* string_tostring */
+
 /* initializes a name matcher */
 static int
 name_matcher_init(sdb_object_t *obj, va_list ap)
@@ -343,6 +578,17 @@ name_matcher_destroy(sdb_object_t *obj)
 	string_matcher_destroy(&m->name);
 } /* name_matcher_destroy */
 
+static char *
+name_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	char name[buflen + 1];
+	assert(m->type == MATCHER_NAME);
+	snprintf(buf, buflen, "OBJ[%s]{ NAME%s }",
+			SDB_STORE_TYPE_TO_NAME(NAME_M(m)->obj_type),
+			string_tostring(&NAME_M(m)->name, name, sizeof(name)));
+	return buf;
+} /* name_tostring */
+
 static int
 attr_matcher_init(sdb_object_t *obj, va_list ap)
 {
@@ -368,6 +614,78 @@ attr_matcher_destroy(sdb_object_t *obj)
 	string_matcher_destroy(&attr->value);
 } /* attr_matcher_destroy */
 
+static char *
+attr_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	char value[buflen + 1];
+
+	if (! m) {
+		snprintf(buf, buflen, "ATTR{}");
+		return buf;
+	}
+
+	assert(m->type == MATCHER_ATTR);
+	snprintf(buf, buflen, "ATTR[%s]{ VALUE%s }", ATTR_M(m)->name,
+			string_tostring(&ATTR_M(m)->value, value, sizeof(value)));
+	return buf;
+} /* attr_tostring */
+
+static int
+cond_matcher_init(sdb_object_t *obj, va_list ap)
+{
+	int type = va_arg(ap, int);
+	sdb_store_cond_t *cond = va_arg(ap, sdb_store_cond_t *);
+
+	if (! cond)
+		return -1;
+
+	sdb_object_ref(SDB_OBJ(cond));
+
+	M(obj)->type = type;
+	COND_M(obj)->cond = cond;
+	return 0;
+} /* cond_matcher_init */
+
+static void
+cond_matcher_destroy(sdb_object_t *obj)
+{
+	sdb_object_deref(SDB_OBJ(COND_M(obj)->cond));
+} /* cond_matcher_destroy */
+
+static char *
+cond_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	const char *type, *id;
+	sdb_data_t value = SDB_DATA_INIT;
+	char value_str[buflen];
+	sdb_store_expr_t *expr;
+
+	if (COND_M(m)->cond->cmp == attr_cmp) {
+		type = "ATTR";
+		id = ATTR_C(COND_M(m)->cond)->name;
+		expr = ATTR_C(COND_M(m)->cond)->expr;
+	}
+	else if (COND_M(m)->cond->cmp == obj_cmp) {
+		type = "OBJ";
+		id = SDB_FIELD_TO_NAME(OBJ_C(COND_M(m)->cond)->field);
+		expr = OBJ_C(COND_M(m)->cond)->expr;
+	}
+	else {
+		snprintf(buf, buflen, "<unknown>");
+		return buf;
+	}
+
+	if (sdb_store_expr_eval(expr, /* obj */ NULL, &value, /* filter */ NULL))
+		snprintf(value_str, sizeof(value_str), "ERR");
+	else if (sdb_data_format(&value, value_str, sizeof(value_str),
+				SDB_SINGLE_QUOTED) < 0)
+		snprintf(value_str, sizeof(value_str), "ERR");
+	snprintf(buf, buflen, "%s[%s]{ %s %s }", type, id,
+			MATCHER_SYM(m->type), value_str);
+	sdb_data_free_datum(&value);
+	return buf;
+} /* cond_tostring */
+
 static int
 op_matcher_init(sdb_object_t *obj, va_list ap)
 {
@@ -394,6 +712,61 @@ op_matcher_destroy(sdb_object_t *obj)
 		sdb_object_deref(SDB_OBJ(OP_M(obj)->right));
 } /* op_matcher_destroy */
 
+static char *
+op_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	char left[buflen + 1], right[buflen + 1];
+
+	if (! m) {
+		/* this should not happen */
+		snprintf(buf, buflen, "()");
+		return buf;
+	}
+
+	assert((m->type == MATCHER_OR) || (m->type == MATCHER_AND));
+	snprintf(buf, buflen, "(%s, %s, %s)",
+			m->type == MATCHER_OR ? "OR" : "AND",
+			sdb_store_matcher_tostring(OP_M(m)->left, left, sizeof(left)),
+			sdb_store_matcher_tostring(OP_M(m)->right, right, sizeof(right)));
+	return buf;
+} /* op_tostring */
+
+static int
+cmp_matcher_init(sdb_object_t *obj, va_list ap)
+{
+	M(obj)->type = va_arg(ap, int);
+
+	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));
+
+	if ((! CMP_M(obj)->left) || (! CMP_M(obj)->right))
+		return -1;
+	return 0;
+} /* cmp_matcher_init */
+
+static void
+cmp_matcher_destroy(sdb_object_t *obj)
+{
+	sdb_object_deref(SDB_OBJ(CMP_M(obj)->left));
+	sdb_object_deref(SDB_OBJ(CMP_M(obj)->right));
+} /* cmp_matcher_destroy */
+
+static char *
+cmp_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	if (! m) {
+		/* this should not happen */
+		snprintf(buf, buflen, "()");
+		return buf;
+	}
+
+	/* TODO */
+	snprintf(buf, buflen, "CMP_MATCHER(%d)", m->type);
+	return buf;
+} /* cmp_tostring */
+
 static int
 uop_matcher_init(sdb_object_t *obj, va_list ap)
 {
@@ -416,6 +789,56 @@ uop_matcher_destroy(sdb_object_t *obj)
 		sdb_object_deref(SDB_OBJ(UOP_M(obj)->op));
 } /* uop_matcher_destroy */
 
+static char *
+uop_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	char op[buflen + 1];
+
+	if (! m) {
+		/* this should not happen */
+		snprintf(buf, buflen, "()");
+		return buf;
+	}
+
+	assert(m->type == MATCHER_NOT);
+	snprintf(buf, buflen, "(NOT, %s)",
+			sdb_store_matcher_tostring(UOP_M(m)->op, op, sizeof(op)));
+	return buf;
+} /* uop_tostring */
+
+static int
+isnull_matcher_init(sdb_object_t *obj, va_list ap)
+{
+	const char *name;
+
+	M(obj)->type = va_arg(ap, int);
+	if (M(obj)->type != MATCHER_ISNULL)
+		return -1;
+
+	name = va_arg(ap, const char *);
+	if (! name)
+		return -1;
+	ISNULL_M(obj)->attr_name = strdup(name);
+	if (! ISNULL_M(obj)->attr_name)
+		return -1;
+	return 0;
+} /* isnull_matcher_init */
+
+static void
+isnull_matcher_destroy(sdb_object_t *obj)
+{
+	if (ISNULL_M(obj)->attr_name)
+		free(ISNULL_M(obj)->attr_name);
+	ISNULL_M(obj)->attr_name = NULL;
+} /* isnull_matcher_destroy */
+
+static char *
+isnull_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
+{
+	snprintf(buf, buflen, "(IS NULL, ATTR[%s])", ISNULL_M(m)->attr_name);
+	return buf;
+} /* isnull_tostring */
+
 static sdb_type_t name_type = {
 	/* size = */ sizeof(name_matcher_t),
 	/* init = */ name_matcher_init,
@@ -428,6 +851,12 @@ static sdb_type_t attr_type = {
 	/* destroy = */ attr_matcher_destroy,
 };
 
+static sdb_type_t cond_type = {
+	/* size = */ sizeof(cond_matcher_t),
+	/* init = */ cond_matcher_init,
+	/* destroy = */ cond_matcher_destroy,
+};
+
 static sdb_type_t op_type = {
 	/* size = */ sizeof(op_matcher_t),
 	/* init = */ op_matcher_init,
@@ -440,21 +869,69 @@ static sdb_type_t uop_type = {
 	/* destroy = */ uop_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,
+};
+
+typedef char *(*matcher_tostring_cb)(sdb_store_matcher_t *, char *, size_t);
+
+/* this array needs to be indexable by the matcher types;
+ * -> update the enum in store-private.h when updating this */
+static matcher_tostring_cb
+matchers_tostring[] = {
+	op_tostring,
+	op_tostring,
+	uop_tostring,
+	name_tostring,
+	attr_tostring,
+	cond_tostring,
+	cond_tostring,
+	cond_tostring,
+	cond_tostring,
+	cond_tostring,
+	cmp_tostring,
+	cmp_tostring,
+	cmp_tostring,
+	cmp_tostring,
+	cmp_tostring,
+	isnull_tostring,
+};
+
 /*
  * public API
  */
 
+sdb_store_cond_t *
+sdb_store_attr_cond(const char *name, sdb_store_expr_t *expr)
+{
+	return SDB_STORE_COND(sdb_object_create("attr-cond", attr_cond_type,
+				name, expr));
+} /* sdb_store_attr_cond */
+
+sdb_store_cond_t *
+sdb_store_obj_cond(int field, sdb_store_expr_t *expr)
+{
+	return SDB_STORE_COND(sdb_object_create("obj-cond", obj_cond_type,
+				field, expr));
+} /* sdb_store_obj_cond */
+
 sdb_store_matcher_t *
 sdb_store_name_matcher(int type, const char *name, _Bool re)
 {
 	sdb_store_matcher_t *m;
 
 	if (re)
-		m = M(sdb_object_create("name-matcher", name_type,
-					NULL, name));
+		m = M(sdb_object_create("name-matcher", name_type, NULL, name));
 	else
-		m = M(sdb_object_create("name-matcher", name_type,
-					name, NULL));
+		m = M(sdb_object_create("name-matcher", name_type, name, NULL));
 
 	if (! m)
 		return NULL;
@@ -466,31 +943,223 @@ sdb_store_name_matcher(int type, const char *name, _Bool re)
 sdb_store_matcher_t *
 sdb_store_attr_matcher(const char *name, const char *value, _Bool re)
 {
+	sdb_store_matcher_t *m;
+
+	if (! name)
+		return NULL;
+
 	if (re)
-		return M(sdb_object_create("attr-matcher", attr_type,
+		m = M(sdb_object_create("attr-matcher", attr_type,
 					name, NULL, value));
-	return M(sdb_object_create("attr-matcher", attr_type,
-				name, value, NULL));
+	else
+		m = M(sdb_object_create("attr-matcher", attr_type,
+					name, value, NULL));
+	return m;
 } /* sdb_store_attr_matcher */
 
+sdb_store_matcher_t *
+sdb_store_lt_matcher(sdb_store_cond_t *cond)
+{
+	return M(sdb_object_create("lt-matcher", cond_type,
+				MATCHER_LT, cond));
+} /* sdb_store_lt_matcher */
+
+sdb_store_matcher_t *
+sdb_store_le_matcher(sdb_store_cond_t *cond)
+{
+	return M(sdb_object_create("le-matcher", cond_type,
+				MATCHER_LE, cond));
+} /* sdb_store_le_matcher */
+
+sdb_store_matcher_t *
+sdb_store_eq_matcher(sdb_store_cond_t *cond)
+{
+	return M(sdb_object_create("eq-matcher", cond_type,
+				MATCHER_EQ, cond));
+} /* sdb_store_eq_matcher */
+
+sdb_store_matcher_t *
+sdb_store_ge_matcher(sdb_store_cond_t *cond)
+{
+	return M(sdb_object_create("ge-matcher", cond_type,
+				MATCHER_GE, cond));
+} /* sdb_store_ge_matcher */
+
+sdb_store_matcher_t *
+sdb_store_gt_matcher(sdb_store_cond_t *cond)
+{
+	return M(sdb_object_create("gt-matcher", cond_type,
+				MATCHER_GT, cond));
+} /* sdb_store_gt_matcher */
+
+/*
+ * TODO: Rename sdb_store_cmp_* to sdb_store_* once the old code is unused and
+ * has been removed.
+ */
+
+sdb_store_matcher_t *
+sdb_store_cmp_lt(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("lt-matcher", cmp_type,
+				MATCHER_CMP_LT, left, right));
+} /* sdb_store_cmp_lt */
+
+sdb_store_matcher_t *
+sdb_store_cmp_le(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("le-matcher", cmp_type,
+				MATCHER_CMP_LE, left, right));
+} /* sdb_store_cmp_le */
+
+sdb_store_matcher_t *
+sdb_store_cmp_eq(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("eq-matcher", cmp_type,
+				MATCHER_CMP_EQ, left, right));
+} /* sdb_store_cmp_eq */
+
+sdb_store_matcher_t *
+sdb_store_cmp_ge(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("ge-matcher", cmp_type,
+				MATCHER_CMP_GE, left, right));
+} /* sdb_store_cmp_ge */
+
+sdb_store_matcher_t *
+sdb_store_cmp_gt(sdb_store_expr_t *left, sdb_store_expr_t *right)
+{
+	return M(sdb_object_create("gt-matcher", cmp_type,
+				MATCHER_CMP_GT, left, right));
+} /* sdb_store_cmp_gt */
+
+sdb_store_matcher_t *
+sdb_store_isnull_matcher(const char *attr_name)
+{
+	return M(sdb_object_create("isnull-matcher", isnull_type,
+				MATCHER_ISNULL, attr_name));
+} /* sdb_store_isnull_matcher */
+
+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 */
+
+static int
+parse_cond_op(const char *op,
+		sdb_store_matcher_t *(**matcher)(sdb_store_cond_t *), _Bool *inv)
+{
+	*inv = 0;
+	if (! strcasecmp(op, "<"))
+		*matcher = sdb_store_lt_matcher;
+	else if (! strcasecmp(op, "<="))
+		*matcher = sdb_store_le_matcher;
+	else if (! strcasecmp(op, "="))
+		*matcher = sdb_store_eq_matcher;
+	else if (! strcasecmp(op, ">="))
+		*matcher = sdb_store_ge_matcher;
+	else if (! strcasecmp(op, ">"))
+		*matcher = sdb_store_gt_matcher;
+	else if (! strcasecmp(op, "!=")) {
+		*matcher = sdb_store_eq_matcher;
+		*inv = 1;
+	}
+	else
+		return -1;
+	return 0;
+} /* parse_cond_op */
+
+static sdb_store_matcher_t *
+parse_attr_cmp(const char *attr, const char *op, sdb_store_expr_t *expr)
+{
+	sdb_store_matcher_t *(*matcher)(sdb_store_cond_t *) = NULL;
+	sdb_store_matcher_t *m;
+	sdb_store_cond_t *cond;
+	_Bool inv = 0;
+
+	if (! attr)
+		return NULL;
+
+	if (! strcasecmp(op, "IS")) {
+		if (! expr)
+			return sdb_store_isnull_matcher(attr);
+		else
+			return NULL;
+	}
+	else if (! expr)
+		return NULL;
+	else if (parse_cond_op(op, &matcher, &inv))
+		return NULL;
+
+	cond = sdb_store_attr_cond(attr, expr);
+	if (! cond)
+		return NULL;
+
+	m = matcher(cond);
+	/* pass ownership to 'm' or destroy in case of an error */
+	sdb_object_deref(SDB_OBJ(cond));
+	return maybe_inv_matcher(m, inv);
+} /* parse_attr_cmp */
+
 sdb_store_matcher_t *
 sdb_store_matcher_parse_cmp(const char *obj_type, const char *attr,
-		const char *op, const char *value)
+		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;
 
-	/* TODO: support other operators */
+	/* XXX: this code sucks! */
 	if (! strcasecmp(op, "=")) {
 		/* nothing to do */
 	}
@@ -504,27 +1173,62 @@ sdb_store_matcher_parse_cmp(const char *obj_type, const char *attr,
 		inv = 1;
 		re = 1;
 	}
+	else if (type == SDB_ATTRIBUTE)
+		return parse_attr_cmp(attr, op, expr);
 	else
 		return NULL;
 
-	if (! strcasecmp(attr, "name"))
-		m = sdb_store_name_matcher(type, value, re);
-	else if (type == SDB_ATTRIBUTE)
-		m = sdb_store_attr_matcher(attr, value, re);
-
-	if (! m)
+	if (! expr)
 		return NULL;
 
-	if (inv) {
-		sdb_store_matcher_t *tmp;
-		tmp = sdb_store_inv_matcher(m);
-		/* pass ownership to the inverse matcher */
-		sdb_object_deref(SDB_OBJ(m));
-		m = tmp;
+	if (sdb_store_expr_eval(expr, /* obj */ NULL, &value, /* filter */ NULL)
+			|| (value.type != SDB_TYPE_STRING)) {
+		sdb_data_free_datum(&value);
+		if (type != SDB_ATTRIBUTE)
+			return NULL;
+		return parse_attr_cmp(attr, op, expr);
 	}
-	return m;
+
+	if (! attr)
+		m = sdb_store_name_matcher(type, value.data.string, re);
+	else if (type == SDB_ATTRIBUTE)
+		m = sdb_store_attr_matcher(attr, 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_matcher_parse_field_cmp(const char *name, const char *op,
+		sdb_store_expr_t *expr)
+{
+	sdb_store_matcher_t *(*matcher)(sdb_store_cond_t *) = NULL;
+	sdb_store_matcher_t *m;
+	sdb_store_cond_t *cond;
+	_Bool inv = 0;
+
+	int field;
+
+	if (! expr)
+		return NULL;
+
+	field = sdb_store_parse_field_name(name);
+	if (field < 0)
+		return NULL;
+
+	if (parse_cond_op(op, &matcher, &inv))
+		return NULL;
+	cond = sdb_store_obj_cond(field, expr);
+	if (! cond)
+		return NULL;
+
+	assert(matcher);
+	m = matcher(cond);
+	/* pass ownership to 'm' or destroy in case of an error */
+	sdb_object_deref(SDB_OBJ(cond));
+	return maybe_inv_matcher(m, inv);
+} /* sdb_store_matcher_parse_field_cmp */
+
 sdb_store_matcher_t *
 sdb_store_dis_matcher(sdb_store_matcher_t *left, sdb_store_matcher_t *right)
 {
@@ -546,8 +1250,12 @@ sdb_store_inv_matcher(sdb_store_matcher_t *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 1;
@@ -555,7 +1263,7 @@ sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_base_t *obj)
 	if ((m->type < 0) || ((size_t)m->type >= SDB_STATIC_ARRAY_LEN(matchers)))
 		return 0;
 
-	return matchers[m->type](m, obj);
+	return matchers[m->type](m, obj, filter);
 } /* sdb_store_matcher_matches */
 
 char *
@@ -571,15 +1279,15 @@ sdb_store_matcher_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen)
 } /* sdb_store_matcher_tostring */
 
 int
-sdb_store_lookup(sdb_store_matcher_t *m, sdb_store_lookup_cb cb,
-		void *user_data)
+sdb_store_scan(sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
+		sdb_store_lookup_cb cb, void *user_data)
 {
-	lookup_iter_data_t data = { m, cb, user_data };
+	scan_iter_data_t data = { m, filter, cb, user_data };
 
 	if (! cb)
 		return -1;
-	return sdb_store_iterate(lookup_iter, &data);
-} /* sdb_store_lookup */
+	return sdb_store_iterate(scan_iter, &data);
+} /* sdb_store_scan */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */