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log_event.h
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2000-11-17
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
(at your option) any later version.
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_EVENT_H
#define _LOG_EVENT_H
#if defined(__GNUC__) && !defined(MYSQL_CLIENT)
#pragma interface /* gcc class implementation */
#endif
#define LOG_READ_EOF -1
#define LOG_READ_BOGUS -2
#define LOG_READ_IO -3
#define LOG_READ_MEM -5
#define LOG_READ_TRUNC -6
#define LOG_EVENT_OFFSET 4
#define BINLOG_VERSION 1
#define LOG_EVENT_HEADER_LEN 13
#define QUERY_HEADER_LEN (sizeof(uint32) + sizeof(uint32) + \
sizeof(uchar) + sizeof(uint16))
#define LOAD_HEADER_LEN (sizeof(uint32) + sizeof(uint32) + \
+ sizeof(uint32) + 2 + sizeof(uint32))
#define EVENT_LEN_OFFSET 9
#define EVENT_TYPE_OFFSET 4
#define MAX_EVENT_LEN 4*1024*1024
#define QUERY_EVENT_OVERHEAD (LOG_EVENT_HEADER_LEN+QUERY_HEADER_LEN)
#define ROTATE_EVENT_OVERHEAD LOG_EVENT_HEADER_LEN
#define LOAD_EVENT_OVERHEAD (LOG_EVENT_HEADER_LEN+LOAD_HEADER_LEN+sizeof(sql_ex_info))
#define BINLOG_MAGIC "\xfe\x62\x69\x6e"
enum Log_event_type { START_EVENT = 1, QUERY_EVENT =2,
STOP_EVENT=3, ROTATE_EVENT = 4, INTVAR_EVENT=5,
LOAD_EVENT=6};
enum Int_event_type { INVALID_INT_EVENT = 0, LAST_INSERT_ID_EVENT = 1, INSERT_ID_EVENT = 2
};
#ifndef MYSQL_CLIENT
class String;
#endif
extern uint32 server_id;
class Log_event
{
public:
time_t when;
ulong exec_time;
int valid_exec_time; // if false, the exec time setting is bogus
uint32 server_id;
int write(IO_CACHE* file);
int write_header(IO_CACHE* file);
virtual int write_data(IO_CACHE* file __attribute__((unused))) { return 0; }
virtual Log_event_type get_type_code() = 0;
Log_event(time_t when_arg, ulong exec_time_arg = 0,
int valid_exec_time_arg = 0, uint32 server_id = 0): when(when_arg),
exec_time(exec_time_arg), valid_exec_time(valid_exec_time_arg)
{
if(!server_id) this->server_id = ::server_id;
else this->server_id = server_id;
}
Log_event(const char* buf): valid_exec_time(0)
{
when = uint4korr(buf);
server_id = uint4korr(buf + 5);
}
virtual ~Log_event() {}
virtual int get_data_size() { return 0;}
virtual void print(FILE* file, bool short_form = 0) = 0;
void print_timestamp(FILE* file, time_t *ts = 0);
void print_header(FILE* file);
// if mutex is 0, the read will proceed without mutex
static Log_event* read_log_event(IO_CACHE* file, pthread_mutex_t* log_lock);
static Log_event* read_log_event(const char* buf, int event_len);
#ifndef MYSQL_CLIENT
static int read_log_event(IO_CACHE* file, String* packet,
pthread_mutex_t* log_lock);
#endif
};
class Query_log_event: public Log_event
{
protected:
char* data_buf;
public:
const char* query;
const char* db;
uint32 q_len; // if we already know the length of the query string
// we pass it here, so we would not have to call strlen()
// otherwise, set it to 0, in which case, we compute it with strlen()
uint32 db_len;
uint16 error_code;
int thread_id;
#if !defined(MYSQL_CLIENT)
THD* thd;
Query_log_event(THD* thd_arg, const char* query_arg):
Log_event(thd_arg->start_time,0,0,thd_arg->server_id), data_buf(0),
query(query_arg), db(thd_arg->db), q_len(thd_arg->query_length),
error_code(thd_arg->net.last_errno),
thread_id(thd_arg->thread_id), thd(thd_arg)
{
time_t end_time;
time(&end_time);
exec_time = (ulong) (end_time - thd->start_time);
valid_exec_time = 1;
db_len = (db) ? (uint32) strlen(db) : 0;
}
#endif
Query_log_event(IO_CACHE* file, time_t when, uint32 server_id);
Query_log_event(const char* buf, int event_len);
~Query_log_event()
{
if (data_buf)
{
my_free((gptr) data_buf, MYF(0));
}
}
Log_event_type get_type_code() { return QUERY_EVENT; }
int write(IO_CACHE* file);
int write_data(IO_CACHE* file); // returns 0 on success, -1 on error
int get_data_size()
{
return q_len + db_len + 2 +
sizeof(uint32) // thread_id
+ sizeof(uint32) // exec_time
+ sizeof(uint16) // error_code
;
}
void print(FILE* file, bool short_form = 0);
};
#define DUMPFILE_FLAG 0x1
#define OPT_ENCLOSED_FLAG 0x2
#define REPLACE_FLAG 0x4
#define IGNORE_FLAG 0x8
#define FIELD_TERM_EMPTY 0x1
#define ENCLOSED_EMPTY 0x2
#define LINE_TERM_EMPTY 0x4
#define LINE_START_EMPTY 0x8
#define ESCAPED_EMPTY 0x10
struct sql_ex_info
{
char field_term;
char enclosed;
char line_term;
char line_start;
char escaped;
char opt_flags; // flags for the options
char empty_flags; // flags to indicate which of the terminating charact
} ;
class Load_log_event: public Log_event
{
protected:
char* data_buf;
void copy_log_event(const char *buf, ulong data_len);
public:
int thread_id;
uint32 table_name_len;
uint32 db_len;
uint32 fname_len;
uint32 num_fields;
const char* fields;
const uchar* field_lens;
uint32 field_block_len;
const char* table_name;
const char* db;
const char* fname;
uint32 skip_lines;
sql_ex_info sql_ex;
#if !defined(MYSQL_CLIENT)
THD* thd;
String field_lens_buf;
String fields_buf;
Load_log_event(THD* thd, sql_exchange* ex, const char* table_name,
List<Item>& fields, enum enum_duplicates handle_dup ):
Log_event(thd->start_time),data_buf(0),thread_id(thd->thread_id),
num_fields(0),fields(0),field_lens(0),field_block_len(0),
table_name(table_name),
db(thd->db),
fname(ex->file_name),
thd(thd)
{
time_t end_time;
time(&end_time);
exec_time = (ulong) (end_time - thd->start_time);
valid_exec_time = 1;
db_len = (db) ? (uint32) strlen(db) : 0;
table_name_len = (table_name) ? (uint32) strlen(table_name) : 0;
fname_len = (fname) ? (uint) strlen(fname) : 0;
sql_ex.field_term = (*ex->field_term)[0];
sql_ex.enclosed = (*ex->enclosed)[0];
sql_ex.line_term = (*ex->line_term)[0];
sql_ex.line_start = (*ex->line_start)[0];
sql_ex.escaped = (*ex->escaped)[0];
sql_ex.opt_flags = 0;
if(ex->dumpfile)
sql_ex.opt_flags |= DUMPFILE_FLAG;
if(ex->opt_enclosed)
sql_ex.opt_flags |= OPT_ENCLOSED_FLAG;
sql_ex.empty_flags = 0;
switch(handle_dup)
{
case DUP_IGNORE: sql_ex.opt_flags |= IGNORE_FLAG; break;
case DUP_REPLACE: sql_ex.opt_flags |= REPLACE_FLAG; break;
case DUP_ERROR: break;
}
if(!ex->field_term->length())
sql_ex.empty_flags |= FIELD_TERM_EMPTY;
if(!ex->enclosed->length())
sql_ex.empty_flags |= ENCLOSED_EMPTY;
if(!ex->line_term->length())
sql_ex.empty_flags |= LINE_TERM_EMPTY;
if(!ex->line_start->length())
sql_ex.empty_flags |= LINE_START_EMPTY;
if(!ex->escaped->length())
sql_ex.empty_flags |= ESCAPED_EMPTY;
skip_lines = ex->skip_lines;
List_iterator<Item> li(fields);
field_lens_buf.length(0);
fields_buf.length(0);
Item* item;
while((item = li++))
{
num_fields++;
uchar len = (uchar) strlen(item->name);
field_block_len += len + 1;
fields_buf.append(item->name, len + 1);
field_lens_buf.append((char*)&len, 1);
}
field_lens = (const uchar*)field_lens_buf.ptr();
this->fields = fields_buf.ptr();
}
void set_fields(List<Item> &fields);
#endif
Load_log_event(IO_CACHE * file, time_t when, uint32 server_id);
Load_log_event(const char* buf, int event_len);
~Load_log_event()
{
if (data_buf)
{
my_free((gptr) data_buf, MYF(0));
}
}
Log_event_type get_type_code() { return LOAD_EVENT; }
int write_data(IO_CACHE* file); // returns 0 on success, -1 on error
int get_data_size()
{
return table_name_len + 2 + db_len + 2 + fname_len
+ sizeof(thread_id) // thread_id
+ sizeof(exec_time) // exec_time
+ sizeof(skip_lines)
+ sizeof(field_block_len)
+ sizeof(sql_ex) + field_block_len + num_fields*sizeof(uchar) ;
;
}
void print(FILE* file, bool short_form = 0);
};
extern char server_version[50];
class Start_log_event: public Log_event
{
public:
uint32 created;
uint16 binlog_version;
char server_version[50];
Start_log_event() :Log_event(time(NULL)),binlog_version(BINLOG_VERSION)
{
created = (uint32) when;
memcpy(server_version, ::server_version, sizeof(server_version));
}
Start_log_event(IO_CACHE* file, time_t when_arg, uint32 server_id) :
Log_event(when_arg, 0, 0, server_id)
{
char buf[sizeof(server_version) + 2 + 4 + 4];
if (my_b_read(file, (byte*) buf, sizeof(buf)))
return;
binlog_version = uint2korr(buf+4);
memcpy(server_version, buf + 6, sizeof(server_version));
created = uint4korr(buf + 6 + sizeof(server_version));
}
Start_log_event(const char* buf);
~Start_log_event() {}
Log_event_type get_type_code() { return START_EVENT;}
int write_data(IO_CACHE* file);
int get_data_size()
{
// sizeof(binlog_version) + sizeof(server_version) sizeof(created)
return 2 + sizeof(server_version) + 4;
}
void print(FILE* file, bool short_form = 0);
};
class Intvar_log_event: public Log_event
{
public:
ulonglong val;
uchar type;
Intvar_log_event(uchar type_arg, ulonglong val_arg)
:Log_event(time(NULL)),val(val_arg),type(type_arg)
{}
Intvar_log_event(IO_CACHE* file, time_t when, uint32 server_id);
Intvar_log_event(const char* buf);
~Intvar_log_event() {}
Log_event_type get_type_code() { return INTVAR_EVENT;}
int get_data_size() { return sizeof(type) + sizeof(val);}
int write_data(IO_CACHE* file);
void print(FILE* file, bool short_form = 0);
};
class Stop_log_event: public Log_event
{
public:
Stop_log_event() :Log_event(time(NULL))
{}
Stop_log_event(IO_CACHE* file, time_t when_arg, uint32 server_id):
Log_event(when_arg,0,0,server_id)
{
byte skip[4];
my_b_read(file, skip, sizeof(skip)); // skip the event length
}
Stop_log_event(const char* buf):Log_event(buf)
{
}
~Stop_log_event() {}
Log_event_type get_type_code() { return STOP_EVENT;}
void print(FILE* file, bool short_form = 0);
};
class Rotate_log_event: public Log_event
{
public:
const char* new_log_ident;
uchar ident_len;
bool alloced;
Rotate_log_event(const char* new_log_ident_arg, uint ident_len_arg = 0) :
Log_event(time(NULL)),
new_log_ident(new_log_ident_arg),
ident_len(ident_len_arg ? ident_len_arg : (uint) strlen(new_log_ident_arg)),
alloced(0)
{}
Rotate_log_event(IO_CACHE* file, time_t when, uint32 server_id) ;
Rotate_log_event(const char* buf, int event_len);
~Rotate_log_event()
{
if (alloced)
my_free((gptr) new_log_ident, MYF(0));
}
Log_event_type get_type_code() { return ROTATE_EVENT;}
int get_data_size() { return ident_len;}
int write_data(IO_CACHE* file);
void print(FILE* file, bool short_form = 0);
};
#endif