index a2163bce9841d479557ad5f8c4f93bdf69ba4af5..ad90da3b48a3edb0aa28dfde3dfa85aa8b6483fd 100644 (file)
#define SDB_FRONTEND_CONNECTION_H 1
#include "frontend/proto.h"
+#include "core/store.h"
+#include "utils/llist.h"
#include "utils/strbuf.h"
+#include "utils/proto.h"
#include <inttypes.h>
extern "C" {
#endif
+/*
+ * sdb_conn_t represents an open connection from a client. It inherits from
+ * sdb_object_t and may safely be cast to a generic object.
+ */
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_conn_setup_cb is a callback function used to setup a connection. For
+ * example, it may be used to initialize session information.
+ */
+typedef int (*sdb_conn_setup_cb)(sdb_conn_t *, void *);
+
+/*
+ * sdb_connection_enable_logging:
+ * Enable logging of connection-related messages to the current client
+ * connection. After this function has been called all log messages
+ * originating from the thread handling the current client connection will
+ * also be sent to the client.
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_connection_enable_logging(void);
+
/*
* sdb_connection_accpet:
* Accept a new connection on the specified file-descriptor 'fd' and return a
- * newly allocated connection object.
+ * newly allocated connection object. If specified, the setup callback is used
+ * to setup the newly created connection. It will receive the connection
+ * object and the specified user data as its arguments.
*
* Returns:
* - 0 on success
* - a negative value else
*/
sdb_conn_t *
-sdb_connection_accept(int fd);
+sdb_connection_accept(int fd, sdb_conn_setup_cb setup, void *user_data);
/*
* sdb_connection_close:
- * Close a open connection and deallocate any memory. The connection object is
- * no longer valid after calling this function.
+ * Close an open connection. Any subsequent reads from the connection will
+ * fail. Use sdb_object_deref to free the memory used by the object.
*/
void
sdb_connection_close(sdb_conn_t *conn);
/*
- * sdb_connection_read:
- * Read from an open connection until reading would block.
+ * sdb_connection_handle:
+ * Read from an open connection until reading would block and handle all
+ * incoming commands.
*
* Returns:
* - the number of bytes read (0 on EOF)
* - a negative value on error
*/
ssize_t
-sdb_connection_read(sdb_conn_t *conn);
+sdb_connection_handle(sdb_conn_t *conn);
/*
* sdb_connection_send:
int
sdb_connection_ping(sdb_conn_t *conn);
+/*
+ * sdb_connection_server_version:
+ * Send back the backend server version to the connected client.
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_connection_server_version(sdb_conn_t *conn);
+
/*
* session handling
*/
*/
/*
- * sdb_fe_list:
- * Send a complete listing of the store, serialized as JSON, to the client.
+ * sdb_fe_query, sdb_fe_fetch, sdb_fe_list, sdb_fe_lookup, sdb_fe_store:
+ * Handle the SDB_CONNECTION_QUERY, SDB_CONNECTION_FETCH, SDB_CONNECTION_LIST,
+ * SDB_CONNECTION_LOOKUP, and SDB_CONNECTION_STORE commands respectively. It
+ * is expected that the current command has been initialized already.
*
* Returns:
* - 0 on success
* - a negative value else
*/
int
+sdb_fe_query(sdb_conn_t *conn);
+int
+sdb_fe_fetch(sdb_conn_t *conn);
+int
sdb_fe_list(sdb_conn_t *conn);
+int
+sdb_fe_lookup(sdb_conn_t *conn);
+int
+sdb_fe_store(sdb_conn_t *conn);
+
+/*
+ * sdb_fe_store_host, sdb_fe_store_service, sdb_fe_store_metric,
+ * sdb_fe_store_attribute:
+ * Execute the 'STORE' command for the respective object type.
+ *
+ * Returns:
+ * - 0 on success
+ * - a negative value else
+ */
+int
+sdb_fe_store_host(sdb_conn_t *conn, const sdb_proto_host_t *host);
+int
+sdb_fe_store_service(sdb_conn_t *conn, const sdb_proto_service_t *svc);
+int
+sdb_fe_store_metric(sdb_conn_t *conn, const sdb_proto_metric_t *metric);
+int
+sdb_fe_store_attribute(sdb_conn_t *conn, const sdb_proto_attribute_t *attr);
#ifdef __cplusplus
} /* extern "C" */