X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Fcore%2Fstore_expr.c;h=c96b3396876940e487353b9bc7169c17e0bf3f82;hp=a0047a1f12e1fa8498ef0ed5255373478f98a070;hb=b54d9fff4bc9e70efe83123403a4c9f935efb74e;hpb=9935ca9e91f79b4f5ee6e9a7f94912b7992e8858

diff --git a/src/core/store_expr.c b/src/core/store_expr.c
index a0047a1..c96b339 100644
--- a/src/core/store_expr.c
+++ b/src/core/store_expr.c
@@ -39,6 +39,7 @@
 #include "core/object.h"
 
 #include <assert.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -46,15 +47,33 @@
  * private data types
  */
 
+/* iterate through either a list of child nodes or arrays */
+struct sdb_memstore_expr_iter {
+	sdb_memstore_obj_t *obj;
+	sdb_memstore_expr_t *expr;
+
+	sdb_avltree_iter_t *tree;
+
+	sdb_data_t array;
+	size_t array_idx;
+	bool free_array;
+
+	sdb_memstore_matcher_t *filter;
+};
+
+/*
+ * private types
+ */
+
 static int
 expr_init(sdb_object_t *obj, va_list ap)
 {
 	int type = va_arg(ap, int);
-	sdb_store_expr_t *left  = va_arg(ap, sdb_store_expr_t *);
-	sdb_store_expr_t *right = va_arg(ap, sdb_store_expr_t *);
+	sdb_memstore_expr_t *left  = va_arg(ap, sdb_memstore_expr_t *);
+	sdb_memstore_expr_t *right = va_arg(ap, sdb_memstore_expr_t *);
 	const sdb_data_t *value = va_arg(ap, const sdb_data_t *);
 
-	sdb_store_expr_t *expr = SDB_STORE_EXPR(obj);
+	sdb_memstore_expr_t *expr = SDB_MEMSTORE_EXPR(obj);
 
 	if (type <= 0) {
 		if (! value)
@@ -86,7 +105,7 @@ expr_init(sdb_object_t *obj, va_list ap)
 static void
 expr_destroy(sdb_object_t *obj)
 {
-	sdb_store_expr_t *expr = SDB_STORE_EXPR(obj);
+	sdb_memstore_expr_t *expr = SDB_MEMSTORE_EXPR(obj);
 	sdb_object_deref(SDB_OBJ(expr->left));
 	sdb_object_deref(SDB_OBJ(expr->right));
 
@@ -95,7 +114,7 @@ expr_destroy(sdb_object_t *obj)
 } /* expr_destroy */
 
 static sdb_type_t expr_type = {
-	/* size = */ sizeof(sdb_store_expr_t),
+	/* size = */ sizeof(sdb_memstore_expr_t),
 	/* init = */ expr_init,
 	/* destroy = */ expr_destroy,
 };
@@ -104,17 +123,17 @@ static sdb_type_t expr_type = {
  * public API
  */
 
-sdb_store_expr_t *
-sdb_store_expr_create(int op, sdb_store_expr_t *left, sdb_store_expr_t *right)
+sdb_memstore_expr_t *
+sdb_memstore_expr_create(int op, sdb_memstore_expr_t *left, sdb_memstore_expr_t *right)
 {
 	sdb_data_t value = SDB_DATA_INIT;
-	sdb_store_expr_t *e;
+	sdb_memstore_expr_t *e;
 
 	if ((op < 0) || (SDB_DATA_CONCAT < op) || (! left) || (! right))
 		return NULL;
 
 	if (left->type || right->type) {
-		e = SDB_STORE_EXPR(sdb_object_create("store-expr", expr_type,
+		e = SDB_MEMSTORE_EXPR(sdb_object_create("store-expr", expr_type,
 					op, left, right, NULL));
 		e->data_type = sdb_data_expr_type(op, left->type, right->type);
 		return e;
@@ -123,76 +142,76 @@ sdb_store_expr_create(int op, sdb_store_expr_t *left, sdb_store_expr_t *right)
 
 	if (sdb_data_expr_eval(op, &left->data, &right->data, &value))
 		return NULL;
-	e = SDB_STORE_EXPR(sdb_object_create("store-constvalue", expr_type,
+	e = SDB_MEMSTORE_EXPR(sdb_object_create("store-constvalue", expr_type,
 				0, NULL, NULL, &value));
 	e->data_type = value.type;
 	return e;
-} /* sdb_store_expr_create */
+} /* sdb_memstore_expr_create */
 
-sdb_store_expr_t *
-sdb_store_expr_typed(int typ, sdb_store_expr_t *expr)
+sdb_memstore_expr_t *
+sdb_memstore_expr_typed(int typ, sdb_memstore_expr_t *expr)
 {
 	sdb_data_t value = { SDB_TYPE_INTEGER, { .integer = typ } };
-	sdb_store_expr_t *e;
+	sdb_memstore_expr_t *e;
 
 	if ((typ < SDB_HOST) || (SDB_ATTRIBUTE < typ))
 		return NULL;
 
-	e = SDB_STORE_EXPR(sdb_object_create("store-typedexpr", expr_type,
+	e = SDB_MEMSTORE_EXPR(sdb_object_create("store-typedexpr", expr_type,
 				TYPED_EXPR, expr, NULL, &value));
 	e->data_type = expr->data_type;
 	return e;
-} /* sdb_store_expr_typed */
+} /* sdb_memstore_expr_typed */
 
-sdb_store_expr_t *
-sdb_store_expr_fieldvalue(int field)
+sdb_memstore_expr_t *
+sdb_memstore_expr_fieldvalue(int field)
 {
 	sdb_data_t value = { SDB_TYPE_INTEGER, { .integer = field } };
-	sdb_store_expr_t *e;
+	sdb_memstore_expr_t *e;
 
-	if ((field < SDB_FIELD_NAME) || (SDB_FIELD_BACKEND < field))
+	if ((field < SDB_FIELD_NAME) || (SDB_FIELD_TIMESERIES < field))
 		return NULL;
-	e = SDB_STORE_EXPR(sdb_object_create("store-fieldvalue", expr_type,
+	e = SDB_MEMSTORE_EXPR(sdb_object_create("store-fieldvalue", expr_type,
 				FIELD_VALUE, NULL, NULL, &value));
 	e->data_type = SDB_FIELD_TYPE(field);
 	return e;
-} /* sdb_store_expr_fieldvalue */
+} /* sdb_memstore_expr_fieldvalue */
 
-sdb_store_expr_t *
-sdb_store_expr_attrvalue(const char *name)
+sdb_memstore_expr_t *
+sdb_memstore_expr_attrvalue(const char *name)
 {
 	sdb_data_t value = { SDB_TYPE_STRING, { .string = NULL} };
-	sdb_store_expr_t *expr;
+	sdb_memstore_expr_t *expr;
 
 	value.data.string = strdup(name);
 	if (! value.data.string)
 		return NULL;
 
-	expr = SDB_STORE_EXPR(sdb_object_create("store-attrvalue", expr_type,
+	expr = SDB_MEMSTORE_EXPR(sdb_object_create("store-attrvalue", expr_type,
 				ATTR_VALUE, NULL, NULL, &value));
 	if (! expr)
 		free(value.data.string);
 	expr->data_type = -1;
 	return expr;
-} /* sdb_store_expr_attrvalue */
+} /* sdb_memstore_expr_attrvalue */
 
-sdb_store_expr_t *
-sdb_store_expr_constvalue(const sdb_data_t *value)
+sdb_memstore_expr_t *
+sdb_memstore_expr_constvalue(const sdb_data_t *value)
 {
 	sdb_data_t data = SDB_DATA_INIT;
-	sdb_store_expr_t *e;
+	sdb_memstore_expr_t *e;
 
 	if (sdb_data_copy(&data, value))
 		return NULL;
-	e = SDB_STORE_EXPR(sdb_object_create("store-constvalue", expr_type,
+	e = SDB_MEMSTORE_EXPR(sdb_object_create("store-constvalue", expr_type,
 				0, NULL, NULL, &data));
 	e->data_type = data.type;
 	return e;
-} /* sdb_store_expr_constvalue */
+} /* sdb_memstore_expr_constvalue */
 
 int
-sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
-		sdb_data_t *res, sdb_store_matcher_t *filter)
+sdb_memstore_expr_eval(sdb_memstore_expr_t *expr, sdb_memstore_obj_t *obj,
+		sdb_data_t *res, sdb_memstore_matcher_t *filter)
 {
 	sdb_data_t v1 = SDB_DATA_INIT, v2 = SDB_DATA_INIT;
 	int status = 0;
@@ -200,15 +219,15 @@ sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
 	if ((! expr) || (! res))
 		return -1;
 
-	if (filter && obj && (! sdb_store_matcher_matches(filter, obj, NULL)))
+	if (filter && obj && (! sdb_memstore_matcher_matches(filter, obj, NULL)))
 		obj = NULL; /* this object does not exist */
 
 	if (! expr->type)
 		return sdb_data_copy(res, &expr->data);
 	else if (expr->type == FIELD_VALUE)
-		return sdb_store_get_field(obj, (int)expr->data.data.integer, res);
+		return sdb_memstore_get_field(obj, (int)expr->data.data.integer, res);
 	else if (expr->type == ATTR_VALUE) {
-		status = sdb_store_get_attr(obj, expr->data.data.string, res, filter);
+		status = sdb_memstore_get_attr(obj, expr->data.data.string, res, filter);
 		if ((status < 0) && obj) {
 			/* attribute does not exist => NULL */
 			status = 0;
@@ -227,12 +246,12 @@ sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
 				return -1;
 			obj = obj->parent;
 		}
-		return sdb_store_expr_eval(expr->left, obj, res, filter);
+		return sdb_memstore_expr_eval(expr->left, obj, res, filter);
 	}
 
-	if (sdb_store_expr_eval(expr->left, obj, &v1, filter))
+	if (sdb_memstore_expr_eval(expr->left, obj, &v1, filter))
 		return -1;
-	if (sdb_store_expr_eval(expr->right, obj, &v2, filter)) {
+	if (sdb_memstore_expr_eval(expr->right, obj, &v2, filter)) {
 		sdb_data_free_datum(&v1);
 		return -1;
 	}
@@ -242,7 +261,203 @@ sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
 	sdb_data_free_datum(&v1);
 	sdb_data_free_datum(&v2);
 	return status;
-} /* sdb_store_expr_eval */
+} /* sdb_memstore_expr_eval */
+
+sdb_memstore_expr_iter_t *
+sdb_memstore_expr_iter(sdb_memstore_expr_t *expr, sdb_memstore_obj_t *obj,
+		sdb_memstore_matcher_t *filter)
+{
+	sdb_memstore_expr_iter_t *iter;
+	sdb_avltree_iter_t *tree = NULL;
+	sdb_data_t array = SDB_DATA_INIT;
+	bool free_array = 0;
+
+	if (! expr)
+		return NULL;
+
+	while (expr->type == TYPED_EXPR) {
+		int type = (int)expr->data.data.integer;
+
+		if (obj->type == type) {
+			/* self reference */
+		}
+		else if ((type == SDB_HOST)
+				&& ((obj->type == SDB_SERVICE)
+					|| (obj->type == SDB_METRIC))) {
+			/* reference to parent host */
+			obj = obj->parent;
+		}
+		else
+			break;
+		expr = expr->left;
+	}
+
+	if (expr->type == TYPED_EXPR) {
+		if (! obj)
+			return NULL;
+		if (obj->type == SDB_HOST) {
+			if (expr->data.data.integer == SDB_SERVICE)
+				tree = sdb_avltree_get_iter(HOST(obj)->services);
+			else if (expr->data.data.integer == SDB_METRIC)
+				tree = sdb_avltree_get_iter(HOST(obj)->metrics);
+			else if (expr->data.data.integer == SDB_ATTRIBUTE)
+				tree = sdb_avltree_get_iter(HOST(obj)->attributes);
+		}
+		else if (obj->type == SDB_SERVICE) {
+			if (expr->data.data.integer == SDB_ATTRIBUTE)
+				tree = sdb_avltree_get_iter(SVC(obj)->attributes);
+		}
+		else if (obj->type == SDB_METRIC) {
+			if (expr->data.data.integer == SDB_ATTRIBUTE)
+				tree = sdb_avltree_get_iter(METRIC(obj)->attributes);
+		}
+	}
+	else if (expr->type == FIELD_VALUE) {
+		if (! obj)
+			return NULL;
+		if (expr->data.data.integer == SDB_FIELD_BACKEND) {
+			/* while scanning the store, we hold a read lock, so it's safe to
+			 * access the data without copying */
+			array.type = SDB_TYPE_ARRAY | SDB_TYPE_STRING;
+			array.data.array.length = obj->backends_num;
+			array.data.array.values = obj->backends;
+		}
+	}
+	else if (! expr->type) {
+		if (expr->data.type & SDB_TYPE_ARRAY)
+			array = expr->data;
+	}
+	else {
+		sdb_data_t value = SDB_DATA_INIT;
+		if (sdb_memstore_expr_eval(expr, obj, &value, filter))
+			return NULL;
+		if (! (value.type & SDB_TYPE_ARRAY)) {
+			sdb_data_free_datum(&value);
+			return NULL;
+		}
+		array = value;
+		free_array = 1;
+	}
+
+	if ((! tree) && (array.type == SDB_TYPE_NULL))
+		return NULL;
+
+	iter = calloc(1, sizeof(*iter));
+	if (! iter) {
+		if (free_array)
+			sdb_data_free_datum(&array);
+		return NULL;
+	}
+
+	sdb_object_ref(SDB_OBJ(obj));
+	sdb_object_ref(SDB_OBJ(expr));
+	sdb_object_ref(SDB_OBJ(filter));
+
+	iter->obj = obj;
+	iter->expr = expr;
+	iter->tree = tree;
+	iter->array = array;
+	iter->free_array = free_array;
+	iter->filter = filter;
+	return iter;
+} /* sdb_memstore_expr_iter */
+
+void
+sdb_memstore_expr_iter_destroy(sdb_memstore_expr_iter_t *iter)
+{
+	sdb_data_t null = SDB_DATA_INIT;
+
+	if (! iter)
+		return;
+
+	if (iter->tree)
+		sdb_avltree_iter_destroy(iter->tree);
+	iter->tree = NULL;
+
+	if (iter->free_array)
+		sdb_data_free_datum(&iter->array);
+	iter->array = null;
+	iter->array_idx = 0;
+
+	sdb_object_deref(SDB_OBJ(iter->obj));
+	sdb_object_deref(SDB_OBJ(iter->expr));
+	sdb_object_deref(SDB_OBJ(iter->filter));
+	free(iter);
+} /* sdb_memstore_expr_iter_destroy */
+
+bool
+sdb_memstore_expr_iter_has_next(sdb_memstore_expr_iter_t *iter)
+{
+	if (! iter)
+		return 0;
+
+	if (iter->tree) {
+		/* this function may be called before get_next,
+		 * so we'll have to apply filters here as well */
+		if (iter->filter) {
+			sdb_memstore_obj_t *child;
+			while ((child = STORE_OBJ(sdb_avltree_iter_peek_next(iter->tree)))) {
+				if (sdb_memstore_matcher_matches(iter->filter, child, NULL))
+					break;
+				(void)sdb_avltree_iter_get_next(iter->tree);
+			}
+		}
+
+		return sdb_avltree_iter_has_next(iter->tree);
+	}
+
+	return iter->array_idx < iter->array.data.array.length;
+} /* sdb_memstore_expr_iter_has_next */
+
+sdb_data_t
+sdb_memstore_expr_iter_get_next(sdb_memstore_expr_iter_t *iter)
+{
+	sdb_data_t null = SDB_DATA_INIT;
+	sdb_data_t ret = SDB_DATA_INIT;
+	sdb_data_t tmp = SDB_DATA_INIT;
+
+	if (! iter)
+		return null;
+
+	if (iter->tree) {
+		sdb_memstore_obj_t *child;
+
+		while (42) {
+			child = STORE_OBJ(sdb_avltree_iter_get_next(iter->tree));
+			if (! child)
+				break;
+			if (iter->filter
+					&& (! sdb_memstore_matcher_matches(iter->filter, child, NULL)))
+				continue;
+
+			if (sdb_memstore_expr_eval(iter->expr, child, &ret, iter->filter))
+				return null;
+			break;
+		}
+
+		/* Skip over any filtered objects */
+		if (iter->filter) {
+			while ((child = STORE_OBJ(sdb_avltree_iter_peek_next(iter->tree)))) {
+				if (sdb_memstore_matcher_matches(iter->filter, child, NULL))
+					break;
+				(void)sdb_avltree_iter_get_next(iter->tree);
+			}
+		}
+
+		return ret;
+	}
+
+	if (iter->array_idx >= iter->array.data.array.length)
+		return null;
+
+	++iter->array_idx;
+	if (sdb_data_array_get(&iter->array, iter->array_idx - 1, &ret))
+		return null;
+	if (sdb_data_copy(&tmp, &ret))
+		return null;
+	ret = tmp;
+	return ret;
+} /* sdb_memstore_expr_iter_get_next */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */