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index b1d15f5b77d7569e771ddd5bc5ae8741ae5f229e..6dd7d1ade1ca98b952a4ce05a8b1a4f6bc21fa49 100644 (file)
--- a/src/include/core/store.h
+++ b/src/include/core/store.h
typedef struct sdb_store_matcher sdb_store_matcher_t;
#define SDB_STORE_MATCHER(obj) ((sdb_store_matcher_t *)(obj))
+/*
+ * A JSON formatter converts a stored object into the JSON format.
+ * See http://www.ietf.org/rfc/rfc4627.txt
+ */
+struct sdb_store_json_formatter;
+typedef struct sdb_store_json_formatter sdb_store_json_formatter_t;
+
/*
* Queryable fields of a stored object.
*/
: ((f) == SDB_FIELD_INTERVAL) ? "interval" \
: ((f) == SDB_FIELD_BACKEND) ? "backend" : "unknown")
+#define SDB_FIELD_TYPE(f) \
+ (((f) == SDB_FIELD_NAME) ? SDB_TYPE_STRING \
+ : ((f) == SDB_FIELD_LAST_UPDATE) ? SDB_TYPE_DATETIME \
+ : ((f) == SDB_FIELD_AGE) ? SDB_TYPE_DATETIME \
+ : ((f) == SDB_FIELD_INTERVAL) ? SDB_TYPE_DATETIME \
+ : ((f) == SDB_FIELD_BACKEND) ? (SDB_TYPE_ARRAY | SDB_TYPE_STRING) \
+ : -1)
+
/*
* sdb_store_clear:
* Clear the entire store and remove all stored objects.
sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
sdb_data_t *res, sdb_store_matcher_t *filter);
-/*
- * Conditionals may be used to lookup hosts from the store based on a
- * conditional expression.
- *
- * A conditional object inherits from sdb_object_t and, thus, may safely be
- * cast to a generic object.
- */
-struct sdb_store_cond;
-typedef struct sdb_store_cond sdb_store_cond_t;
-#define SDB_STORE_COND(obj) ((sdb_store_cond_t *)(obj))
-
-/*
- * sdb_store_attr_cond:
- * Creates a conditional based on attribute values. The value of stored
- * attributes is compared against the value the expression evaluates to. See
- * sdb_data_cmp for details about the comparison.
- */
-sdb_store_cond_t *
-sdb_store_attr_cond(const char *name, sdb_store_expr_t *expr);
-
-/*
- * sdb_store_obj_cond:
- * Creates a conditional based on queryable object fields. The respective
- * field of *any* object type is compared against the value the expression
- * evaluates to.
- */
-sdb_store_cond_t *
-sdb_store_obj_cond(int field, sdb_store_expr_t *expr);
-
-/*
- * sdb_store_name_matcher:
- * Creates a matcher matching by the specified object type's name. If 're' is
- * true, the specified name is treated as a POSIX extended regular expression.
- * Else, the exact name has to match (case-insensitive).
- */
-sdb_store_matcher_t *
-sdb_store_name_matcher(int type, const char *name, _Bool re);
-
-/*
- * sdb_store_attr_matcher:
- * Creates a matcher matching attributes based on their value. If 're' is
- * true, the specified name is treated as a POSIX extended regular expression.
- * Else, the exact name has to match (case-insensitive).
- */
-sdb_store_matcher_t *
-sdb_store_attr_matcher(const char *name, const char *value, _Bool re);
-
/*
* sdb_store_isnull_matcher:
* Creates a matcher matching NULL values.
sdb_store_isnnull_matcher(sdb_store_expr_t *expr);
/*
- * sdb_store_child_matcher:
- * Creates a matcher matching an object's children of the specified type. It
- * matches if *any* of those children match 'm'.
+ * sdb_store_any_matcher:
+ * Creates a matcher iterating over objects of the specified type. It matches
+ * if *any* of those objects match 'm'.
+ */
+sdb_store_matcher_t *
+sdb_store_any_matcher(int type, sdb_store_matcher_t *m);
+
+/*
+ * sdb_store_all_matcher:
+ * Creates a matcher iterating over objects of the specified type. It matches
+ * if *all* of those objects match 'm'.
*/
sdb_store_matcher_t *
-sdb_store_child_matcher(int type, sdb_store_matcher_t *m);
+sdb_store_all_matcher(int type, sdb_store_matcher_t *m);
/*
* sdb_store_lt_matcher, sdb_store_le_matcher, sdb_store_eq_matcher,
* sdb_store_ge_matcher, sdb_store_gt_matcher:
- * Creates a matcher based on a conditional. The matcher matches objects for
- * which the conditional evaluates the object to compare less than, less or
- * equal, equal, greater or equal, or greater than the conditional's value
- * repsectively.
+ * Create conditional matchers comparing the values of two expressions. The
+ * matcher matches if the left expression compres less than, less or equal
+ * than, equal to, not equal to, greater or equal than, or greater than the
+ * right expression.
*/
sdb_store_matcher_t *
-sdb_store_lt_matcher(sdb_store_cond_t *cond);
+sdb_store_lt_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_le_matcher(sdb_store_cond_t *cond);
+sdb_store_le_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_eq_matcher(sdb_store_cond_t *cond);
+sdb_store_eq_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_ge_matcher(sdb_store_cond_t *cond);
-sdb_store_matcher_t *
-sdb_store_gt_matcher(sdb_store_cond_t *cond);
-
+sdb_store_ne_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_cmp_lt(sdb_store_expr_t *left, sdb_store_expr_t *right);
+sdb_store_ge_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_cmp_le(sdb_store_expr_t *left, sdb_store_expr_t *right);
-sdb_store_matcher_t *
-sdb_store_cmp_eq(sdb_store_expr_t *left, sdb_store_expr_t *right);
-sdb_store_matcher_t *
-sdb_store_cmp_ne(sdb_store_expr_t *left, sdb_store_expr_t *right);
-sdb_store_matcher_t *
-sdb_store_cmp_ge(sdb_store_expr_t *left, sdb_store_expr_t *right);
+sdb_store_gt_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
+
+/*
+ * sdb_store_in_matcher:
+ * Creates a matcher which matches if the right value evaluates to an array
+ * value and the left value is included in that array. See sdb_data_inarray
+ * for more details.
+ */
sdb_store_matcher_t *
-sdb_store_cmp_gt(sdb_store_expr_t *left, sdb_store_expr_t *right);
+sdb_store_in_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
/*
* sdb_store_regex_matcher:
sdb_store_matcher_op_cb
sdb_store_parse_matcher_op(const char *op);
+/*
+ * sdb_store_parse_object_type:
+ * Parse the type name of a stored object.
+ *
+ * Returns:
+ * - the object type on success
+ * - a negative value else
+ */
+int
+sdb_store_parse_object_type(const char *name);
+
/*
* sdb_store_parse_object_type_plural:
* Parse the type name (plural) of a stored object.
int
sdb_store_parse_field_name(const char *name);
-/*
- * sdb_store_matcher_parse_cmp:
- * Parse a simple compare expression (<obj_type>.<attr> <op> <expression>).
- *
- * Returns:
- * - a matcher object on success
- * - NULL else
- */
-sdb_store_matcher_t *
-sdb_store_matcher_parse_cmp(const char *obj_type, const char *attr,
- const char *op, sdb_store_expr_t *expr);
-
-/*
- * sdb_store_matcher_parse_field_cmp:
- * Parse a simple compare expression for queryable object fields (<field> <op>
- * <expression>).
- *
- * Returns:
- * - a matcher object on success
- * - NULL else
- */
-sdb_store_matcher_t *
-sdb_store_matcher_parse_field_cmp(const char *name, const char *op,
- sdb_store_expr_t *expr);
-
/*
* sdb_store_dis_matcher:
* Creates a matcher matching the disjunction (logical OR) of two matchers.
sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
sdb_store_matcher_t *filter);
-/*
- * sdb_store_matcher_tostring:
- * Format a matcher object as string. This is meant for logging or debugging
- * purposes.
- */
-char *
-sdb_store_matcher_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen);
-
/*
* sdb_store_lookup_cb:
* Lookup callback. It is called for each matching object when looking up data
- * in the store. The lookup aborts if the callback returns non-zero.
+ * in the store passing on the lookup filter and the specified user-data. The
+ * lookup aborts early if the callback returns non-zero.
*/
-typedef int (*sdb_store_lookup_cb)(sdb_store_obj_t *obj, void *user_data);
+typedef int (*sdb_store_lookup_cb)(sdb_store_obj_t *obj,
+ sdb_store_matcher_t *filter, void *user_data);
/*
* sdb_store_scan:
- * Look up objects in the store. The specified callback function is called for
- * each object in the store matching 'm'. The function performs a full scan of
- * all hosts stored in the database. If specified, the filter will be used to
- * preselect objects for further evaluation. See the description of
- * 'sdb_store_matcher_matches' for details.
+ * Look up objects of the specified type in the store. The specified callback
+ * function is called for each object in the store matching 'm'. The function
+ * performs a full scan of all objects stored in the database. If specified,
+ * the filter will be used to preselect objects for further evaluation. See
+ * the description of 'sdb_store_matcher_matches' for details.
*
* Returns:
* - 0 on success
* - a negative value else
*/
int
-sdb_store_scan(sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
+sdb_store_scan(int type, sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
sdb_store_lookup_cb cb, void *user_data);
/*
sdb_store_matcher_t *filter, int flags);
/*
- * sdb_store_iter_cb:
- * Store iterator callback. Iteration stops if the callback returns non-zero.
+ * sdb_store_json_formatter:
+ * Create a JSON formatter writing to the specified buffer.
+ */
+sdb_store_json_formatter_t *
+sdb_store_json_formatter(sdb_strbuf_t *buf);
+
+/*
+ * sdb_store_json_emit:
+ * Serialize a single object to JSON adding it to the string buffer associated
+ * with the formatter object. The serialized object will not include
+ * attributes or any child objects. Instead, call the function again for each
+ * of those objects. All attributes have to be emitted before any other
+ * children types. Use sdb_store_json_emit_full() to emit a full (filtered)
+ * object.
+ *
+ * Note that the output might not be valid JSON before calling
+ * sdb_store_json_finish().
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
*/
-typedef int (*sdb_store_iter_cb)(sdb_store_obj_t *obj, void *user_data);
+int
+sdb_store_json_emit(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj);
/*
- * sdb_store_iterate:
- * Iterate the entire store, calling the specified callback for each object.
- * The user_data pointer is passed on to each call of the callback.
+ * sdb_store_json_emit_full:
+ * Serialize a single object including it's attributes and all children to
+ * JSON, adding it to the string buffer associated with the formatter object.
+ * The filter, if specified, is applied to each attribute and child object.
+ * Only matching objects will be included in the output.
+ *
+ * Note that the output might not be valid JSON before calling
+ * sdb_store_json_finish().
*
* Returns:
* - 0 on success
* - a negative value else
*/
int
-sdb_store_iterate(sdb_store_iter_cb cb, void *user_data);
+sdb_store_json_emit_full(sdb_store_json_formatter_t *f, sdb_store_obj_t *obj,
+ sdb_store_matcher_t *filter);
+
+/*
+ * sdb_store_json_finish:
+ * Finish the JSON output. This function has to be called once after emiting
+ * all objects.
+ */
+int
+sdb_store_json_finish(sdb_store_json_formatter_t *f);
#ifdef __cplusplus
} /* extern "C" */