1
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
4
* Copyright (C) 2008 Sun Microsystems
6
* This program is free software; you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation; version 2 of the License.
10
* This program is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
* GNU General Public License for more details.
15
* You should have received a copy of the GNU General Public License
16
* along with this program; if not, write to the Free Software
17
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20
#ifndef DRIZZLE_SERVER_LOG_H
21
#define DRIZZLE_SERVER_LOG_H
25
class Format_description_log_event;
28
Transaction Coordinator log - a base abstract class
29
for two different implementations
34
int using_heuristic_recover();
38
virtual int open(const char *opt_name)=0;
39
virtual void close()=0;
40
virtual int log_xid(THD *thd, my_xid xid)=0;
41
virtual void unlog(ulong cookie, my_xid xid)=0;
44
class TC_LOG_DUMMY: public TC_LOG // use it to disable the logging
48
int open(const char *opt_name __attribute__((unused)))
51
int log_xid(THD *thd __attribute__((unused)),
52
my_xid xid __attribute__((unused))) { return 1; }
53
void unlog(ulong cookie __attribute__((unused)),
54
my_xid xid __attribute__((unused))) { }
58
class TC_LOG_MMAP: public TC_LOG
60
public: // only to keep Sun Forte on sol9x86 happy
62
POOL, // page is in pool
63
ERROR, // last sync failed
64
DIRTY // new xids added since last sync
68
typedef struct st_page {
69
struct st_page *next; // page a linked in a fifo queue
70
my_xid *start, *end; // usable area of a page
71
my_xid *ptr; // next xid will be written here
72
int size, free; // max and current number of free xid slots on the page
73
int waiters; // number of waiters on condition
74
PAGE_STATE state; // see above
75
pthread_mutex_t lock; // to access page data or control structure
76
pthread_cond_t cond; // to wait for a sync
79
char logname[FN_REFLEN];
82
uint32_t npages, inited;
84
struct st_page *pages, *syncing, *active, *pool, *pool_last;
86
note that, e.g. LOCK_active is only used to protect
87
'active' pointer, to protect the content of the active page
88
one has to use active->lock.
89
Same for LOCK_pool and LOCK_sync
91
pthread_mutex_t LOCK_active, LOCK_pool, LOCK_sync;
92
pthread_cond_t COND_pool, COND_active;
95
TC_LOG_MMAP(): inited(0) {}
96
int open(const char *opt_name);
98
int log_xid(THD *thd, my_xid xid);
99
void unlog(ulong cookie, my_xid xid);
103
void get_active_from_pool();
108
#define TC_LOG_MMAP TC_LOG_DUMMY
111
extern TC_LOG *tc_log;
112
extern TC_LOG_MMAP tc_log_mmap;
113
extern TC_LOG_DUMMY tc_log_dummy;
115
/* log info errors */
116
#define LOG_INFO_EOF -1
117
#define LOG_INFO_IO -2
118
#define LOG_INFO_INVALID -3
119
#define LOG_INFO_SEEK -4
120
#define LOG_INFO_MEM -6
121
#define LOG_INFO_FATAL -7
122
#define LOG_INFO_IN_USE -8
123
#define LOG_INFO_EMFILE -9
126
/* bitmap to SQL_LOG::close() */
127
#define LOG_CLOSE_INDEX 1
128
#define LOG_CLOSE_TO_BE_OPENED 2
129
#define LOG_CLOSE_STOP_EVENT 4
131
class Relay_log_info;
133
typedef struct st_log_info
135
char log_file_name[FN_REFLEN];
136
my_off_t index_file_offset, index_file_start_offset;
138
bool fatal; // if the purge happens to give us a negative offset
139
pthread_mutex_t lock;
141
: index_file_offset(0), index_file_start_offset(0),
144
log_file_name[0] = '\0';
145
pthread_mutex_init(&lock, MY_MUTEX_INIT_FAST);
147
~st_log_info() { pthread_mutex_destroy(&lock);}
151
Currently we have only 3 kinds of logging functions: old-fashioned
152
logs, stdout and csv logging routines.
154
#define MAX_LOG_HANDLERS_NUM 3
156
/* log event handler flags */
161
class Rows_log_event;
163
enum enum_log_type { LOG_UNKNOWN, LOG_NORMAL, LOG_BIN };
164
enum enum_log_state { LOG_OPENED, LOG_CLOSED, LOG_TO_BE_OPENED };
167
TODO use mmap instead of IO_CACHE for binlog
168
(mmap+fsync is two times faster than write+fsync)
175
void init_pthread_objects();
177
bool open(const char *log_name,
178
enum_log_type log_type,
179
const char *new_name,
180
enum cache_type io_cache_type_arg);
181
void init(enum_log_type log_type_arg,
182
enum cache_type io_cache_type_arg);
183
void close(uint32_t exiting);
184
inline bool is_open() { return log_state != LOG_CLOSED; }
185
const char *generate_name(const char *log_name, const char *suffix,
186
bool strip_ext, char *buff);
187
int generate_new_name(char *new_name, const char *log_name);
189
/* LOCK_log is inited by init_pthread_objects() */
190
pthread_mutex_t LOCK_log;
192
char log_file_name[FN_REFLEN];
193
char time_buff[20], db[NAME_LEN + 1];
194
bool write_error, inited;
196
enum_log_type log_type;
197
volatile enum_log_state log_state;
198
enum cache_type io_cache_type;
199
friend class Log_event;
202
class DRIZZLE_BIN_LOG: public TC_LOG, private DRIZZLE_LOG
205
/* LOCK_log and LOCK_index are inited by init_pthread_objects() */
206
pthread_mutex_t LOCK_index;
207
pthread_mutex_t LOCK_prep_xids;
208
pthread_cond_t COND_prep_xids;
209
pthread_cond_t update_cond;
210
uint64_t bytes_written;
212
char index_file_name[FN_REFLEN];
214
The max size before rotation (usable only if log_type == LOG_BIN: binary
215
logs and relay logs).
216
For a binlog, max_size should be max_binlog_size.
217
For a relay log, it should be max_relay_log_size if this is non-zero,
218
max_binlog_size otherwise.
219
max_size is set in init(), and dynamically changed (when one does SET
220
GLOBAL MAX_BINLOG_SIZE|MAX_RELAY_LOG_SIZE) by fix_max_binlog_size and
221
fix_max_relay_log_size).
224
long prepared_xids; /* for tc log - number of xids to remember */
225
// current file sequence number for load data infile binary logging
227
uint32_t open_count; // For replication
229
bool need_start_event;
231
no_auto_events means we don't want any of these automatic events :
232
Start/Rotate/Stop. That is, in 4.x when we rotate a relay log, we don't
233
want a Rotate_log event to be written to the relay log. When we start a
234
relay log etc. So in 4.x this is 1 for relay logs, 0 for binlogs.
235
In 5.0 it's 0 for relay logs too!
239
uint64_t m_table_map_version;
241
int write_to_file(IO_CACHE *cache);
243
This is used to start writing to a new log file. The difference from
244
new_file() is locking. new_file_without_locking() does not acquire
247
void new_file_without_locking();
248
void new_file_impl(bool need_lock);
251
DRIZZLE_LOG::generate_name;
252
DRIZZLE_LOG::is_open;
254
These describe the log's format. This is used only for relay logs.
255
_for_exec is used by the SQL thread, _for_queue by the I/O thread. It's
256
necessary to have 2 distinct objects, because the I/O thread may be reading
257
events in a different format from what the SQL thread is reading (consider
258
the case of a master which has been upgraded from 5.0 to 5.1 without doing
259
RESET MASTER, or from 4.x to 5.0).
261
Format_description_log_event *description_event_for_exec,
262
*description_event_for_queue;
266
note that there's no destructor ~DRIZZLE_BIN_LOG() !
267
The reason is that we don't want it to be automatically called
268
on exit() - but only during the correct shutdown process
271
int open(const char *opt_name);
273
int log_xid(THD *thd, my_xid xid);
274
void unlog(ulong cookie, my_xid xid);
275
int recover(IO_CACHE *log, Format_description_log_event *fdle);
276
bool is_table_mapped(Table *table) const
278
return table->s->table_map_version == table_map_version();
281
uint64_t table_map_version() const { return m_table_map_version; }
282
void update_table_map_version() { ++m_table_map_version; }
284
int flush_and_set_pending_rows_event(THD *thd, Rows_log_event* event);
286
void reset_bytes_written()
290
void harvest_bytes_written(uint64_t* counter)
292
(*counter)+=bytes_written;
296
void set_max_size(ulong max_size_arg);
297
void signal_update();
298
void wait_for_update_relay_log(THD* thd);
299
int wait_for_update_bin_log(THD* thd, const struct timespec * timeout);
300
void set_need_start_event() { need_start_event = 1; }
301
void init(bool no_auto_events_arg, ulong max_size);
302
void init_pthread_objects();
304
bool open(const char *log_name,
305
enum_log_type log_type,
306
const char *new_name,
307
enum cache_type io_cache_type_arg,
308
bool no_auto_events_arg, ulong max_size,
310
bool open_index_file(const char *index_file_name_arg,
311
const char *log_name);
312
/* Use this to start writing a new log file */
315
bool write(Log_event* event_info); // binary log write
316
bool write(THD *thd, IO_CACHE *cache, Log_event *commit_event);
318
int write_cache(IO_CACHE *cache, bool lock_log, bool flush_and_sync);
320
void start_union_events(THD *thd, query_id_t query_id_param);
321
void stop_union_events(THD *thd);
322
bool is_query_in_union(THD *thd, query_id_t query_id_param);
326
invoked as appendv(buf1,len1,buf2,len2,...,bufn,lenn,0)
328
bool appendv(const char* buf,uint32_t len,...);
329
bool append(Log_event* ev);
331
void make_log_name(char* buf, const char* log_ident);
332
bool is_active(const char* log_file_name);
333
int update_log_index(LOG_INFO* linfo, bool need_update_threads);
334
void rotate_and_purge(uint32_t flags);
335
bool flush_and_sync();
336
int purge_logs(const char *to_log, bool included,
337
bool need_mutex, bool need_update_threads,
338
uint64_t *decrease_log_space);
339
int purge_logs_before_date(time_t purge_time);
340
int purge_first_log(Relay_log_info* rli, bool included);
341
bool reset_logs(THD* thd);
342
void close(uint32_t exiting);
344
// iterating through the log index file
345
int find_log_pos(LOG_INFO* linfo, const char* log_name,
347
int find_next_log(LOG_INFO* linfo, bool need_mutex);
348
int get_current_log(LOG_INFO* linfo);
349
int raw_get_current_log(LOG_INFO* linfo);
350
uint32_t next_file_id();
351
inline char* get_index_fname() { return index_file_name;}
352
inline char* get_log_fname() { return log_file_name; }
353
inline char* get_name() { return name; }
354
inline pthread_mutex_t* get_log_lock() { return &LOCK_log; }
355
inline IO_CACHE* get_log_file() { return &log_file; }
357
inline void lock_index() { pthread_mutex_lock(&LOCK_index);}
358
inline void unlock_index() { pthread_mutex_unlock(&LOCK_index);}
359
inline IO_CACHE *get_index_file() { return &index_file;}
360
inline uint32_t get_open_count() { return open_count; }
363
class Log_event_handler
366
Log_event_handler() {}
367
virtual bool init()= 0;
368
virtual void cleanup()= 0;
370
virtual bool log_error(enum loglevel level, const char *format,
372
virtual ~Log_event_handler() {}
376
/* Class which manages slow, general and error log event handlers */
379
rw_lock_t LOCK_logger;
380
/* flag to check whether logger mutex is initialized */
383
/* NULL-terminated arrays of log handlers */
384
Log_event_handler *error_log_handler_list[MAX_LOG_HANDLERS_NUM + 1];
390
void lock_shared() { rw_rdlock(&LOCK_logger); }
391
void lock_exclusive() { rw_wrlock(&LOCK_logger); }
392
void unlock() { rw_unlock(&LOCK_logger); }
393
bool log_command(THD *thd, enum enum_server_command command);
396
We want to initialize all log mutexes as soon as possible,
397
but we cannot do it in constructor, as safe_mutex relies on
398
initialization, performed by MY_INIT(). This why this is done in
402
bool flush_logs(THD *thd);
403
/* Perform basic logger cleanup. this will leave e.g. error log open. */
405
/* Free memory. Nothing could be logged after this function is called */
407
bool error_log_print(enum loglevel level, const char *format,
409
/* we use this function to setup all enabled log event handlers */
410
int set_handlers(uint32_t error_log_printer);
411
void init_error_log(uint32_t error_log_printer);
414
enum enum_binlog_format {
416
statement-based except for cases where only row-based can work (UUID()
419
BINLOG_FORMAT_MIXED= 0,
420
BINLOG_FORMAT_STMT= 1, // statement-based
421
BINLOG_FORMAT_ROW= 2, // row_based
423
This value is last, after the end of binlog_format_typelib: it has no
424
corresponding cell in this typelib. We use this value to be able to know if
425
the user has explicitely specified a binlog format at startup or not.
427
BINLOG_FORMAT_UNSPEC= 3
429
extern TYPELIB binlog_format_typelib;
431
int vprint_msg_to_log(enum loglevel level, const char *format, va_list args);
432
void sql_print_error(const char *format, ...) __attribute__((format(printf, 1, 2)));
433
void sql_print_warning(const char *format, ...) __attribute__((format(printf, 1, 2)));
434
void sql_print_information(const char *format, ...)
435
__attribute__((format(printf, 1, 2)));
436
typedef void (*sql_print_message_func)(const char *format, ...)
437
__attribute__((format(printf, 1, 2)));
438
extern sql_print_message_func sql_print_message_handlers[];
440
int error_log_print(enum loglevel level, const char *format,
443
#endif /* DRIZZLE_SERVER_LOG_H */