index cbe4c2ab233481208e32c815c2923b064be1c3b6..c4478fb327116774114f07ac0e21515b811ecef0 100644 (file)
#ifndef SDB_FRONTEND_CONNECTION_H
#define SDB_FRONTEND_CONNECTION_H 1
+#include "frontend/proto.h"
+#include "utils/llist.h"
#include "utils/strbuf.h"
#include <inttypes.h>
extern "C" {
#endif
-/* status codes returned to a client */
-typedef enum {
- CONNECTION_OK = 0,
- CONNECTION_ERROR
-} sdb_conn_status_t;
-
-/* accepted commands / state of the connection */
-typedef enum {
- /* connection handling */
- CONNECTION_IDLE = 0,
- CONNECTION_PING,
- CONNECTION_STARTUP,
-
- /* querying */
- CONNECTION_LIST,
-} sdb_conn_state_t;
-
typedef struct sdb_conn sdb_conn_t;
+/*
+ * sdb_conn_node_t represents an interface for the result of parsing a command
+ * string. The first field of an actual implementation of the interface is a
+ * sdb_conn_state_t in order to fascilitate casting to and from the interface
+ * type to the implementation type.
+ */
+typedef struct {
+ sdb_object_t super;
+ sdb_conn_state_t cmd;
+} sdb_conn_node_t;
+#define SDB_CONN_NODE(obj) ((sdb_conn_node_t *)(obj))
+
/*
* sdb_connection_accpet:
* Accept a new connection on the specified file-descriptor 'fd' and return a
int
sdb_connection_ping(sdb_conn_t *conn);
+/*
+ * sdb_fe_parse:
+ * Parse the query text specified in 'query' and return a list of parse trees
+ * (for each command) to be executed by sdb_fe_exec. The list has to be freed
+ * by the caller.
+ *
+ * Returns:
+ * - an sdb_llist_t object of sdb_conn_node_t on success
+ * - NULL in case of an error
+ */
+sdb_llist_t *
+sdb_fe_parse(const char *query);
+
+/*
+ * sdb_fe_exec:
+ * Execute the command identified by 'node'.
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_fe_exec(sdb_conn_node_t *node);
+
/*
* session handling
*/
/*
- * sdb_session_start:
+ * sdb_fe_session_start:
* Start a new user session on the specified connection.
*
* Returns:
* - a negative value else
*/
int
-sdb_session_start(sdb_conn_t *conn);
+sdb_fe_session_start(sdb_conn_t *conn);
/*
* store access