~drizzle-trunk/drizzle/development

/*
 * Drizzle Client & Protocol Library
 *
 * Copyright (C) 2008 Eric Day (eday@oddments.org)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *     * The names of its contributors may not be used to endorse or
 * promote products derived from this software without specific prior
 * written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/**
 * @file
 * @brief Drizzle Declarations
 */

#ifndef __DRIZZLE_H
#define __DRIZZLE_H


#include <inttypes.h>
#include <sys/types.h>

#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
# include <Windows.h>
# include <winsock2.h>
# include <ws2tcpip.h>

typedef unsigned int in_port_t;
typedef long ssize_t;

# define snprintf _snprintf
# define inline __inline

struct sockaddr_un
{
  short int sun_family;
  char sun_path[108];
};

# define poll WSAPoll
//# define pollfd WSAPOLLFD

#if defined(__GNUC__)
# include <stdbool.h>
#else
typedef enum { false = 0, true = 1 } _Bool;
typedef _Bool bool;
#endif

#else
# if !defined(__cplusplus)
#  include <stdbool.h>
# endif
# include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>
# include <sys/un.h>
# include <netdb.h>
# include <poll.h>
#endif

#include <assert.h>
#include <errno.h>

#include <libdrizzle/visibility.h>
#include <libdrizzle/constants.h>
#include <libdrizzle/structs.h>
#include <libdrizzle/conn.h>
#include <libdrizzle/result.h>
#include <libdrizzle/column.h>

#ifdef  __cplusplus
extern "C" {
#endif

/**
 * @addtogroup drizzle Drizzle Declarations
 * @ingroup drizzle_client_interface
 * @ingroup drizzle_server_interface
 *
 * This is the core library structure that other structures (such as
 * connections) are created from.
 *
 * There is no locking within a single drizzle_st structure, so for threaded
 * applications you must either ensure isolation in the application or use
 * multiple drizzle_st structures (for example, one for each thread).
 * @{
 */

/**
 * Get library version string.
 *
 * @return Pointer to static buffer in library that holds the version string.
 */
DRIZZLE_API
const char *drizzle_version(void);

/**
 * Get bug report URL.
 *
 * @return Bug report URL string.
 */
DRIZZLE_API
const char *drizzle_bugreport(void);

/**
 * Get string with the name of the given verbose level.
 *
 * @param[in] verbose Verbose logging level.
 * @return String form of verbose level.
 */
DRIZZLE_API
const char *drizzle_verbose_name(drizzle_verbose_t verbose);

/**
 * Initialize a drizzle structure. Always check the return value even if passing
 * in a pre-allocated structure. Some other initialization may have failed.
 *
 * @param[in] drizzle Caller allocated structure, or NULL to allocate one.
 * @return On success, a pointer to the (possibly allocated) structure. On
 * failure this will be NULL.
 */
DRIZZLE_API
drizzle_st *drizzle_create(drizzle_st *drizzle);

/**
 * Clone a drizzle structure.
 *
 * @param[in] drizzle Caller allocated structure, or NULL to allocate one.
 * @param[in] from Drizzle structure to use as a source to clone from.
 * @return Same return as drizzle_create().
 */
DRIZZLE_API
drizzle_st *drizzle_clone(drizzle_st *drizzle, const drizzle_st *from);

/**
 * Free a drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 */
DRIZZLE_API
void drizzle_free(drizzle_st *drizzle);

/**
 * Return an error string for last error encountered.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Pointer to static buffer in library that holds an error string.
 */
DRIZZLE_API
const char *drizzle_error(const drizzle_st *drizzle);

/**
 * Value of errno in the case of a DRIZZLE_RETURN_ERRNO return value.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return An errno value as defined in your system errno.h file.
 */
DRIZZLE_API
int drizzle_errno(const drizzle_st *drizzle);

/**
 * Get server defined error code for the last result read.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return An error code given back in the server response.
 */
DRIZZLE_API
uint16_t drizzle_error_code(const drizzle_st *drizzle);

/**
 * Get SQL state code for the last result read.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return A SQLSTATE code given back in the server response.
 */
DRIZZLE_API
const char *drizzle_sqlstate(const drizzle_st *drizzle);

/**
 * Get options for a drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Options set for the drizzle structure.
 */
DRIZZLE_API
drizzle_options_t drizzle_options(const drizzle_st *drizzle);

/**
 * Set options for a drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] options Available options for drizzle structure to set.
 */
DRIZZLE_API
void drizzle_set_options(drizzle_st *drizzle, drizzle_options_t options);

/**
 * Add options for a drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] options Available options for drizzle structure to add.
 */
DRIZZLE_API
void drizzle_add_options(drizzle_st *drizzle, drizzle_options_t options);

/**
 * Remove options for a drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] options Available options for drizzle structure to remove.
 */
DRIZZLE_API
void drizzle_remove_options(drizzle_st *drizzle, drizzle_options_t options);

/**
 * Get application context pointer.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Application context that was previously set, or NULL.
 */
DRIZZLE_API
void *drizzle_context(const drizzle_st *drizzle);

/**
 * Set application context pointer.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] context Application context to set.
 */
DRIZZLE_API
void drizzle_set_context(drizzle_st *drizzle, void *context);

/**
 * Set function to call when the drizzle structure is being cleaned up so
 * the application can clean up the context pointer.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] function Function to call to clean up drizzle context.
 */
DRIZZLE_API
void drizzle_set_context_free_fn(drizzle_st *drizzle,
                                 drizzle_context_free_fn *function);

/**
 * Get current socket I/O activity timeout value.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Timeout in milliseconds to wait for I/O activity. A negative value
 *  means an infinite timeout.
 */
DRIZZLE_API
int drizzle_timeout(const drizzle_st *drizzle);

/**
 * Set socket I/O activity timeout for connections in a Drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] timeout Milliseconds to wait for I/O activity. A negative value
 *  means an infinite timeout.
 */
DRIZZLE_API
void drizzle_set_timeout(drizzle_st *drizzle, int timeout);

/**
 * Get current verbosity threshold for logging messages.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Current verbosity threshold.
 */
DRIZZLE_API
drizzle_verbose_t drizzle_verbose(const drizzle_st *drizzle);

/**
 * Set verbosity threshold for logging messages. If this is set above
 * DRIZZLE_VERBOSE_NEVER and the drizzle_set_log_fn() callback is set to NULL,
 * messages are printed to STDOUT.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] verbose Verbosity threshold of what to log.
 */
DRIZZLE_API
void drizzle_set_verbose(drizzle_st *drizzle, drizzle_verbose_t verbose);

/**
 * Set logging function for a drizzle structure. This function is only called
 * for log messages that are above the verbosity threshold set with
 * drizzle_set_verbose().
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] function Function to call when there is a logging message.
 * @param[in] context Argument to pass into the callback function.
 */
DRIZZLE_API
void drizzle_set_log_fn(drizzle_st *drizzle, drizzle_log_fn *function,
                        void *context);

/**
 * Set a custom I/O event watcher function for a drizzle structure. Used to
 * integrate libdrizzle with a custom event loop. The callback will be invoked
 * to register or deregister interest in events for a connection. When the
 * events are triggered, drizzle_con_set_revents() should be called to
 * indicate which events are ready. The event loop should stop waiting for
 * these events, as libdrizzle will call the callback again if it is still
 * interested. To resume processing, the libdrizzle function that returned
 * DRIZZLE_RETURN_IO_WAIT should be called again. See drizzle_event_watch_fn().
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] function Function to call when there is an I/O event.
 * @param[in] context Argument to pass into the callback function.
 */
DRIZZLE_API
void drizzle_set_event_watch_fn(drizzle_st *drizzle,
                                drizzle_event_watch_fn *function,
                                void *context);

/**
 * Initialize a connection structure. Always check the return value even if
 * passing in a pre-allocated structure. Some other initialization may have
 * failed.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] con Caller allocated structure, or NULL to allocate one.
 * @return On success, a pointer to the (possibly allocated) structure. On
 *  failure this will be NULL.
 */
DRIZZLE_API
drizzle_con_st *drizzle_con_create(drizzle_st *drizzle, drizzle_con_st *con);

/**
 * Clone a connection structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @param[in] con Caller allocated structure, or NULL to allocate one.
 * @param[in] from Connection structure to use as a source to clone from.
 * @return Same return as drizzle_con_create().
 */
DRIZZLE_API
drizzle_con_st *drizzle_con_clone(drizzle_st *drizzle, drizzle_con_st *con,
                                  const drizzle_con_st *from);

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

/**
 * Free all connections in a drizzle structure.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 */
DRIZZLE_API
void drizzle_con_free_all(drizzle_st *drizzle);

/**
 * Wait for I/O on connections.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Standard drizzle return value.
 */
DRIZZLE_API
drizzle_return_t drizzle_con_wait(drizzle_st *drizzle);

/**
 * Get next connection that is ready for I/O.
 *
 * @param[in] drizzle Drizzle structure previously initialized with
 *  drizzle_create() or drizzle_clone().
 * @return Connection that is ready for I/O, or NULL if there are none.
 */
DRIZZLE_API
drizzle_con_st *drizzle_con_ready(drizzle_st *drizzle);

/** @} */

#ifdef  __cplusplus
}
#endif

#endif /* __DRIZZLE_H */