~drizzle-trunk/drizzle/development

/* Copyright (C) 2005 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#ifndef LOG_H

#define LOG_H

class Relay_log_info;

class Format_description_log_event;

/*

  Transaction Coordinator log - a base abstract class

  for two different implementations

*/

class TC_LOG

{

  public:

  int using_heuristic_recover();

  TC_LOG() {}

  virtual ~TC_LOG() {}

  virtual int open(const char *opt_name)=0;

  virtual void close()=0;

  virtual int log_xid(THD *thd, my_xid xid)=0;

  virtual void unlog(ulong cookie, my_xid xid)=0;

};

class TC_LOG_DUMMY: public TC_LOG // use it to disable the logging

{

public:

  TC_LOG_DUMMY() {}

  int open(const char *opt_name __attribute__((__unused__)))

  { return 0; }

  void close(void)                          { }

  int log_xid(THD *thd __attribute__((__unused__)),

              my_xid xid __attribute__((__unused__)))         { return 1; }

  void unlog(ulong cookie __attribute__((__unused__)),

             my_xid xid __attribute__((__unused__)))  { }

};

#ifdef HAVE_MMAP

class TC_LOG_MMAP: public TC_LOG

{

  public:                // only to keep Sun Forte on sol9x86 happy

  typedef enum {

    POOL,                 // page is in pool

    ERROR,                // last sync failed

    DIRTY                 // new xids added since last sync

  } PAGE_STATE;

  private:

  typedef struct st_page {

    struct st_page *next; // page a linked in a fifo queue

    my_xid *start, *end;  // usable area of a page

    my_xid *ptr;          // next xid will be written here

    int size, free;       // max and current number of free xid slots on the page

    int waiters;          // number of waiters on condition

    PAGE_STATE state;     // see above

    pthread_mutex_t lock; // to access page data or control structure

    pthread_cond_t  cond; // to wait for a sync

  } PAGE;

  char logname[FN_REFLEN];

  File fd;

  my_off_t file_length;

  uint npages, inited;

  uchar *data;

  struct st_page *pages, *syncing, *active, *pool, *pool_last;

  /*

    note that, e.g. LOCK_active is only used to protect

    'active' pointer, to protect the content of the active page

    one has to use active->lock.

    Same for LOCK_pool and LOCK_sync

  */

  pthread_mutex_t LOCK_active, LOCK_pool, LOCK_sync;

  pthread_cond_t COND_pool, COND_active;

  public:

  TC_LOG_MMAP(): inited(0) {}

  int open(const char *opt_name);

  void close();

  int log_xid(THD *thd, my_xid xid);

  void unlog(ulong cookie, my_xid xid);

  int recover();

  private:

  void get_active_from_pool();

  int sync();

  int overflow();

};

#else

#define TC_LOG_MMAP TC_LOG_DUMMY

#endif

extern TC_LOG *tc_log;

extern TC_LOG_MMAP tc_log_mmap;

extern TC_LOG_DUMMY tc_log_dummy;

/* log info errors */

#define LOG_INFO_EOF -1

#define LOG_INFO_IO  -2

#define LOG_INFO_INVALID -3

#define LOG_INFO_SEEK -4

#define LOG_INFO_MEM -6

#define LOG_INFO_FATAL -7

#define LOG_INFO_IN_USE -8

#define LOG_INFO_EMFILE -9

/* bitmap to SQL_LOG::close() */

#define LOG_CLOSE_INDEX		1

#define LOG_CLOSE_TO_BE_OPENED	2

#define LOG_CLOSE_STOP_EVENT	4

class Relay_log_info;

typedef struct st_log_info

{

  char log_file_name[FN_REFLEN];

  my_off_t index_file_offset, index_file_start_offset;

  my_off_t pos;

  bool fatal; // if the purge happens to give us a negative offset

  pthread_mutex_t lock;

  st_log_info()

    : index_file_offset(0), index_file_start_offset(0),

      pos(0), fatal(0)

    {

      log_file_name[0] = '\0';

      pthread_mutex_init(&lock, MY_MUTEX_INIT_FAST);

    }

  ~st_log_info() { pthread_mutex_destroy(&lock);}

} LOG_INFO;

/*

  Currently we have only 3 kinds of logging functions: old-fashioned

  logs, stdout and csv logging routines.

*/

#define MAX_LOG_HANDLERS_NUM 3

/* log event handler flags */

#define LOG_NONE       1

#define LOG_FILE       2

#define LOG_TABLE      4

class Log_event;

class Rows_log_event;

enum enum_log_type { LOG_UNKNOWN, LOG_NORMAL, LOG_BIN };

enum enum_log_state { LOG_OPENED, LOG_CLOSED, LOG_TO_BE_OPENED };

/*

  TODO use mmap instead of IO_CACHE for binlog

  (mmap+fsync is two times faster than write+fsync)

*/

class MYSQL_LOG

{

public:

  MYSQL_LOG();

  void init_pthread_objects();

  void cleanup();

  bool open(const char *log_name,

            enum_log_type log_type,

            const char *new_name,

            enum cache_type io_cache_type_arg);

  void init(enum_log_type log_type_arg,

            enum cache_type io_cache_type_arg);

  void close(uint exiting);

  inline bool is_open() { return log_state != LOG_CLOSED; }

  const char *generate_name(const char *log_name, const char *suffix,

                            bool strip_ext, char *buff);

  int generate_new_name(char *new_name, const char *log_name);

 protected:

  /* LOCK_log is inited by init_pthread_objects() */

  pthread_mutex_t LOCK_log;

  char *name;

  char log_file_name[FN_REFLEN];

  char time_buff[20], db[NAME_LEN + 1];

  bool write_error, inited;

  IO_CACHE log_file;

  enum_log_type log_type;

  volatile enum_log_state log_state;

  enum cache_type io_cache_type;

  friend class Log_event;

};

class MYSQL_QUERY_LOG: public MYSQL_LOG

{

public:

  MYSQL_QUERY_LOG() : last_time(0) {}

  void reopen_file();

  bool write(time_t event_time, const char *user_host,

             uint user_host_len, int thread_id,

             const char *command_type, uint command_type_len,

             const char *sql_text, uint sql_text_len);

  bool write(THD *thd, time_t current_time, time_t query_start_arg,

             const char *user_host, uint user_host_len,

             uint64_t query_utime, uint64_t lock_utime, bool is_command,

             const char *sql_text, uint sql_text_len);

  bool open_slow_log(const char *log_name)

  {

    char buf[FN_REFLEN];

    return open(generate_name(log_name, "-slow.log", 0, buf), LOG_NORMAL, 0,

                WRITE_CACHE);

  }

  bool open_query_log(const char *log_name)

  {

    char buf[FN_REFLEN];

    return open(generate_name(log_name, ".log", 0, buf), LOG_NORMAL, 0,

                WRITE_CACHE);

  }

private:

  time_t last_time;

};

class MYSQL_BIN_LOG: public TC_LOG, private MYSQL_LOG

{

 private:

  /* LOCK_log and LOCK_index are inited by init_pthread_objects() */

  pthread_mutex_t LOCK_index;

  pthread_mutex_t LOCK_prep_xids;

  pthread_cond_t  COND_prep_xids;

  pthread_cond_t update_cond;

  uint64_t bytes_written;

  IO_CACHE index_file;

  char index_file_name[FN_REFLEN];

  /*

     The max size before rotation (usable only if log_type == LOG_BIN: binary

     logs and relay logs).

     For a binlog, max_size should be max_binlog_size.

     For a relay log, it should be max_relay_log_size if this is non-zero,

     max_binlog_size otherwise.

     max_size is set in init(), and dynamically changed (when one does SET

     GLOBAL MAX_BINLOG_SIZE|MAX_RELAY_LOG_SIZE) by fix_max_binlog_size and

     fix_max_relay_log_size).

  */

  ulong max_size;

  long prepared_xids; /* for tc log - number of xids to remember */

  // current file sequence number for load data infile binary logging

  uint file_id;

  uint open_count;				// For replication

  int readers_count;

  bool need_start_event;

  /*

    no_auto_events means we don't want any of these automatic events :

    Start/Rotate/Stop. That is, in 4.x when we rotate a relay log, we don't

    want a Rotate_log event to be written to the relay log. When we start a

    relay log etc. So in 4.x this is 1 for relay logs, 0 for binlogs.

    In 5.0 it's 0 for relay logs too!

  */

  bool no_auto_events;

  uint64_t m_table_map_version;

  int write_to_file(IO_CACHE *cache);

  /*

    This is used to start writing to a new log file. The difference from

    new_file() is locking. new_file_without_locking() does not acquire

    LOCK_log.

  */

  void new_file_without_locking();

  void new_file_impl(bool need_lock);

public:

  MYSQL_LOG::generate_name;

  MYSQL_LOG::is_open;

  /*

    These describe the log's format. This is used only for relay logs.

    _for_exec is used by the SQL thread, _for_queue by the I/O thread. It's

    necessary to have 2 distinct objects, because the I/O thread may be reading

    events in a different format from what the SQL thread is reading (consider

    the case of a master which has been upgraded from 5.0 to 5.1 without doing

    RESET MASTER, or from 4.x to 5.0).

  */

  Format_description_log_event *description_event_for_exec,

    *description_event_for_queue;

  MYSQL_BIN_LOG();

  /*

    note that there's no destructor ~MYSQL_BIN_LOG() !

    The reason is that we don't want it to be automatically called

    on exit() - but only during the correct shutdown process

  */

  int open(const char *opt_name);

  void close();

  int log_xid(THD *thd, my_xid xid);

  void unlog(ulong cookie, my_xid xid);

  int recover(IO_CACHE *log, Format_description_log_event *fdle);

#if !defined(MYSQL_CLIENT)

  bool is_table_mapped(TABLE *table) const

  {

    return table->s->table_map_version == table_map_version();

  }

  uint64_t table_map_version() const { return m_table_map_version; }

  void update_table_map_version() { ++m_table_map_version; }

  int flush_and_set_pending_rows_event(THD *thd, Rows_log_event* event);

#endif /* !defined(MYSQL_CLIENT) */

  void reset_bytes_written()

  {

    bytes_written = 0;

  }

  void harvest_bytes_written(uint64_t* counter)

  {

    (*counter)+=bytes_written;

    bytes_written=0;

    return;

  }

  void set_max_size(ulong max_size_arg);

  void signal_update();

  void wait_for_update_relay_log(THD* thd);

  int  wait_for_update_bin_log(THD* thd, const struct timespec * timeout);

  void set_need_start_event() { need_start_event = 1; }

  void init(bool no_auto_events_arg, ulong max_size);

  void init_pthread_objects();

  void cleanup();

  bool open(const char *log_name,

            enum_log_type log_type,

            const char *new_name,

	    enum cache_type io_cache_type_arg,

	    bool no_auto_events_arg, ulong max_size,

            bool null_created);

  bool open_index_file(const char *index_file_name_arg,

                       const char *log_name);

  /* Use this to start writing a new log file */

  void new_file();

  bool write(Log_event* event_info); // binary log write

  bool write(THD *thd, IO_CACHE *cache, Log_event *commit_event);

  int  write_cache(IO_CACHE *cache, bool lock_log, bool flush_and_sync);

  void start_union_events(THD *thd, query_id_t query_id_param);

  void stop_union_events(THD *thd);

  bool is_query_in_union(THD *thd, query_id_t query_id_param);

  /*

    v stands for vector

    invoked as appendv(buf1,len1,buf2,len2,...,bufn,lenn,0)

  */

  bool appendv(const char* buf,uint len,...);

  bool append(Log_event* ev);

  void make_log_name(char* buf, const char* log_ident);

  bool is_active(const char* log_file_name);

  int update_log_index(LOG_INFO* linfo, bool need_update_threads);

  void rotate_and_purge(uint flags);

  bool flush_and_sync();

  int purge_logs(const char *to_log, bool included,

                 bool need_mutex, bool need_update_threads,

                 uint64_t *decrease_log_space);

  int purge_logs_before_date(time_t purge_time);

  int purge_first_log(Relay_log_info* rli, bool included);

  bool reset_logs(THD* thd);

  void close(uint exiting);

  // iterating through the log index file

  int find_log_pos(LOG_INFO* linfo, const char* log_name,

		   bool need_mutex);

  int find_next_log(LOG_INFO* linfo, bool need_mutex);

  int get_current_log(LOG_INFO* linfo);

  int raw_get_current_log(LOG_INFO* linfo);

  uint next_file_id();

  inline char* get_index_fname() { return index_file_name;}

  inline char* get_log_fname() { return log_file_name; }

  inline char* get_name() { return name; }

  inline pthread_mutex_t* get_log_lock() { return &LOCK_log; }

  inline IO_CACHE* get_log_file() { return &log_file; }

  inline void lock_index() { pthread_mutex_lock(&LOCK_index);}

  inline void unlock_index() { pthread_mutex_unlock(&LOCK_index);}

  inline IO_CACHE *get_index_file() { return &index_file;}

  inline uint32_t get_open_count() { return open_count; }

};

class Log_event_handler

{

public:

  Log_event_handler() {}

  virtual bool init()= 0;

  virtual void cleanup()= 0;

  virtual bool log_slow(THD *thd, time_t current_time,

                        time_t query_start_arg, const char *user_host,

                        uint user_host_len, uint64_t query_utime,

                        uint64_t lock_utime, bool is_command,

                        const char *sql_text, uint sql_text_len)= 0;

  virtual bool log_error(enum loglevel level, const char *format,

                         va_list args)= 0;

  virtual bool log_general(THD *thd, time_t event_time, const char *user_host,

                           uint user_host_len, int thread_id,

                           const char *command_type, uint command_type_len,

                           const char *sql_text, uint sql_text_len,

                           CHARSET_INFO *client_cs)= 0;

  virtual ~Log_event_handler() {}

};

/* type of the log table */

#define QUERY_LOG_SLOW 1

#define QUERY_LOG_GENERAL 2

class Log_to_file_event_handler: public Log_event_handler

{

  MYSQL_QUERY_LOG mysql_log;

  MYSQL_QUERY_LOG mysql_slow_log;

  bool is_initialized;

public:

  Log_to_file_event_handler(): is_initialized(false)

  {}

  virtual bool init();

  virtual void cleanup();

  virtual bool log_slow(THD *thd, time_t current_time,

                        time_t query_start_arg, const char *user_host,

                        uint user_host_len, uint64_t query_utime,

                        uint64_t lock_utime, bool is_command,

                        const char *sql_text, uint sql_text_len);

  virtual bool log_error(enum loglevel level, const char *format,

                         va_list args);

  virtual bool log_general(THD *thd, time_t event_time, const char *user_host,

                           uint user_host_len, int thread_id,

                           const char *command_type, uint command_type_len,

                           const char *sql_text, uint sql_text_len,

                           CHARSET_INFO *client_cs);

  void flush();

  void init_pthread_objects();

  MYSQL_QUERY_LOG *get_mysql_slow_log() { return &mysql_slow_log; }

  MYSQL_QUERY_LOG *get_mysql_log() { return &mysql_log; }

};

/* Class which manages slow, general and error log event handlers */

class LOGGER

{

  rw_lock_t LOCK_logger;

  /* flag to check whether logger mutex is initialized */

  uint inited;

  /* available log handlers */

  Log_to_file_event_handler *file_log_handler;

  /* NULL-terminated arrays of log handlers */

  Log_event_handler *error_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];

  Log_event_handler *slow_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];

  Log_event_handler *general_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];

public:

  LOGGER() : inited(0), file_log_handler(NULL)

  {}

  void lock_shared() { rw_rdlock(&LOCK_logger); }

  void lock_exclusive() { rw_wrlock(&LOCK_logger); }

  void unlock() { rw_unlock(&LOCK_logger); }

  bool log_command(THD *thd, enum enum_server_command command);

  /*

    We want to initialize all log mutexes as soon as possible,

    but we cannot do it in constructor, as safe_mutex relies on

    initialization, performed by MY_INIT(). This why this is done in

    this function.

  */

  void init_base();

  bool flush_logs(THD *thd);

  /* Perform basic logger cleanup. this will leave e.g. error log open. */

  void cleanup_base();

  /* Free memory. Nothing could be logged after this function is called */

  void cleanup_end();

  bool error_log_print(enum loglevel level, const char *format,

                      va_list args);

  bool slow_log_print(THD *thd, const char *query, uint query_length,

                      uint64_t current_utime);

  bool general_log_print(THD *thd,enum enum_server_command command,

                         const char *format, va_list args);

  bool general_log_write(THD *thd, enum enum_server_command command,

                         const char *query, uint query_length);

  /* we use this function to setup all enabled log event handlers */

  int set_handlers(uint error_log_printer,

                   uint slow_log_printer,

                   uint general_log_printer);

  void init_error_log(uint error_log_printer);

  void init_slow_log(uint slow_log_printer);

  void init_general_log(uint general_log_printer);

  void deactivate_log_handler(THD* thd, uint log_type);

  bool activate_log_handler(THD* thd, uint log_type);

  MYSQL_QUERY_LOG *get_slow_log_file_handler()

  { 

    if (file_log_handler)

      return file_log_handler->get_mysql_slow_log();

    return NULL;

  }

  MYSQL_QUERY_LOG *get_log_file_handler()

  { 

    if (file_log_handler)

      return file_log_handler->get_mysql_log();

    return NULL;

  }

};

enum enum_binlog_format {

  /*

    statement-based except for cases where only row-based can work (UUID()

    etc):

  */

  BINLOG_FORMAT_MIXED= 0,

  BINLOG_FORMAT_STMT= 1, // statement-based

  BINLOG_FORMAT_ROW= 2, // row_based

/*

  This value is last, after the end of binlog_format_typelib: it has no

  corresponding cell in this typelib. We use this value to be able to know if

  the user has explicitely specified a binlog format at startup or not.

*/

  BINLOG_FORMAT_UNSPEC= 3

};

extern TYPELIB binlog_format_typelib;

#endif /* LOG_H */