/*
 * Drizzle Client & Protocol Library
 *
 * Copyright (C) 2008 Eric Day (eday@oddments.org)
 * All rights reserved.
 *
 * Use and distribution licensed under the BSD license.  See
 * the COPYING.BSD file in the root source directory for full text.
 */

/**
 * @file
 * @brief Connection Declarations
 */

#ifndef __DRIZZLE_CONN_H
#define __DRIZZLE_CONN_H

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @addtogroup drizzle_con Connection Declarations
 * @ingroup drizzle_client_interface
 * @ingroup drizzle_server_interface
 * @{
 */

/**
 * Get file descriptor for connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return File descriptor of connection, or -1 if not active.
 */
DRIZZLE_API
int drizzle_con_fd(const drizzle_con_st *con);

/**
 * Use given file descriptor for connction.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] fd File descriptor for connection.
 * @return Standard drizzle return value.
 */
DRIZZLE_API
drizzle_return_t drizzle_con_set_fd(drizzle_con_st *con, int fd);

/**
 * Close a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 */
DRIZZLE_API
void drizzle_con_close(drizzle_con_st *con);

/**
 * Set events to be watched for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] events Bitfield of poll() events to watch.
 * @return Standard drizzle return value.
 */
DRIZZLE_API
drizzle_return_t drizzle_con_set_events(drizzle_con_st *con, short events);

/**
 * Set events that are ready for a connection. This is used with the external
 * event callbacks. See drizzle_set_event_watch_fn().
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] revents Bitfield of poll() events that were detected.
 * @return Standard drizzle return value.
 */
DRIZZLE_API
drizzle_return_t drizzle_con_set_revents(drizzle_con_st *con, short revents);

/**
 * Get the drizzle_st struct that the connection belongs to.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Drizzle object that this connection is part of.
 */
DRIZZLE_API
drizzle_st *drizzle_con_drizzle(const drizzle_con_st *con);

/**
 * Return an error string for last error encountered.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Pointer to static buffer in library that holds an error string.
 */
DRIZZLE_API
const char *drizzle_con_error(const drizzle_con_st *con);

/**
 * Value of errno in the case of a DRIZZLE_RETURN_ERRNO return value.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return An errno value as defined in your system errno.h file.
 */
DRIZZLE_API
int drizzle_con_errno(const drizzle_con_st *con);

/**
 * Get server defined error code for the last result read.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return An error code given back in the server response.
 */
DRIZZLE_API
uint16_t drizzle_con_error_code(const drizzle_con_st *con);

/**
 * Get SQL state code for the last result read.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return A SQLSTATE code given back in the server response.
 */
DRIZZLE_API
const char *drizzle_con_sqlstate(const drizzle_con_st *con);

/**
 * Get options for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Options set for the connection structure.
 */
DRIZZLE_API
drizzle_con_options_t drizzle_con_options(const drizzle_con_st *con);

/**
 * Set options for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] options Available options for connection structure to set.
 */
DRIZZLE_API
void drizzle_con_set_options(drizzle_con_st *con,
                             drizzle_con_options_t options);

/**
 * Add options for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] options Available options for connection structure to set.
 */
DRIZZLE_API
void drizzle_con_add_options(drizzle_con_st *con,
                             drizzle_con_options_t options);

/**
 * Remove options for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] options Available options for connection structure to remove.
 */
DRIZZLE_API
void drizzle_con_remove_options(drizzle_con_st *con,
                                drizzle_con_options_t options);

/**
 * Get TCP host for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Host this connection is configured for, or NULL if not set.
 */
DRIZZLE_API
const char *drizzle_con_host(const drizzle_con_st *con);

/**
 * Get TCP port for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Port this connection is configured for, 0 if not set.
 */
DRIZZLE_API
in_port_t drizzle_con_port(const drizzle_con_st *con);

/**
 * Set TCP host and port for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] host Host to use for this connection, NULL for default value.
 * @param[in] port Port to use for this connection, 0 for default value.
 */
DRIZZLE_API
void drizzle_con_set_tcp(drizzle_con_st *con, const char *host, in_port_t port);

/**
 * Get unix domain socket for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Unix domain socket set for this connection, NULL if not set.
 */
DRIZZLE_API
const char *drizzle_con_uds(const drizzle_con_st *con);

/**
 * Set unix domain socket for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] uds Unix domain socket to use for this connection, NULL for
 *  defailt value.
 */
DRIZZLE_API
void drizzle_con_set_uds(drizzle_con_st *con, const char *uds);

/**
 * Get username for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return User associated with this connection.
 */
DRIZZLE_API
const char *drizzle_con_user(const drizzle_con_st *con);

/**
 * Get password for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Password associated with this connection.
 */
DRIZZLE_API
const char *drizzle_con_password(const drizzle_con_st *con);

/**
 * Set username and password for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] user Username to use for this connection.
 * @param[in] password Password to use for this connection.
 */
DRIZZLE_API
void drizzle_con_set_auth(drizzle_con_st *con, const char *user,
                          const char *password);

/**
 * Get database for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Database associated with this connection.
 */
DRIZZLE_API
const char *drizzle_con_db(const drizzle_con_st *con);

/**
 * Set database for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] db Database to use with this connection.
 */
DRIZZLE_API
void drizzle_con_set_db(drizzle_con_st *con, const char *db);

/**
 * Get application context pointer for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Application context with this connection.
 */
DRIZZLE_API
void *drizzle_con_context(const drizzle_con_st *con);

/**
 * Set application context pointer for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] context Application context to use with this connection.
 */
DRIZZLE_API
void drizzle_con_set_context(drizzle_con_st *con, void *context);

/**
 * Set callback function when the context pointer should be freed.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @param[in] function Function to call to clean up connection context.
 */
DRIZZLE_API
void drizzle_con_set_context_free_fn(drizzle_con_st *con,
                                     drizzle_con_context_free_fn *function);

/**
 * Get protocol version for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Protocol version for connection.
 */
DRIZZLE_API
uint8_t drizzle_con_protocol_version(const drizzle_con_st *con);

/**
 * Get server version string for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Server version string for connection.
 */
DRIZZLE_API
const char *drizzle_con_server_version(const drizzle_con_st *con);

/**
 * Get server version number for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Server version number for connection.
 */
DRIZZLE_API
uint32_t drizzle_con_server_version_number(const drizzle_con_st *con);

/**
 * Get thread ID for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Thread ID for connection.
 */
DRIZZLE_API
uint32_t drizzle_con_thread_id(const drizzle_con_st *con);

/**
 * Get scramble buffer for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Scramble buffer for connection.
 */
DRIZZLE_API
const uint8_t *drizzle_con_scramble(const drizzle_con_st *con);

/**
 * Get capabilities for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Capabilities for connection.
 */
DRIZZLE_API
drizzle_capabilities_t drizzle_con_capabilities(const drizzle_con_st *con);

/**
 * Get character set for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Character set for connection.
 */
DRIZZLE_API
drizzle_charset_t drizzle_con_charset(const drizzle_con_st *con);

/**
 * Get status for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Status for connection.
 */
DRIZZLE_API
drizzle_con_status_t drizzle_con_status(const drizzle_con_st *con);

/**
 * Get max packet size for a connection.
 *
 * @param[in] con Connection structure previously initialized with
 *  drizzle_con_create(), drizzle_con_clone(), or related functions.
 * @return Max packet size for connection.
 */
DRIZZLE_API
uint32_t drizzle_con_max_packet_size(const drizzle_con_st *con);

/** @} */

#ifdef __cplusplus
}
#endif

#endif /* __DRIZZLE_CONN_H */