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mariadb_rpl.c
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mariadb_rpl.c
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/************************************************************************************
Copyright (C) 2018,2022 MariaDB Corporation AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not see <http://www.gnu.org/licenses>
or write to the Free Software Foundation, Inc.,
51 Franklin St., Fifth Floor, Boston, MA 02110, USA
*************************************************************************************/
#include <ma_global.h>
#include <ma_sys.h>
#include <ma_common.h>
#include <mysql.h>
#include <errmsg.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <zlib.h>
#include <ma_decimal.h>
#include <mariadb_rpl.h>
#ifdef WIN32
#include <malloc.h>
#undef alloca
#define alloca _malloca
#endif
#define RPL_EVENT_HEADER_SIZE 19
#define RPL_ERR_POS(r) (r)->filename_length, (r)->filename, (r)->start_position
#define RPL_CHECK_NULL_POS(position, end)\
{\
uchar *tmp= (position);\
while (*tmp && tmp < (end))\
tmp++;\
if (tmp > (end))\
goto malformed_packet;\
}
#define RPL_CHECK_POS(position, end, bytes)\
if ((end)-(position) < (ssize_t)(bytes))\
goto malformed_packet;
#define RPL_CHECK_FIELD_LENGTH(position, end)\
{\
RPL_CHECK_POS((position), (end), 1);\
RPL_CHECK_POS((position), (end), net_field_size((position)));\
}
#define RPL_CHECK_POST_HEADER_LEN(position, end, type)\
if (rpl->post_header_len[(type) - 1])\
{\
RPL_CHECK_POS((position), (end), rpl->post_header_len[(type)-1])\
}
static inline uint64_t uintNkorr(uint8_t len, u_char *p)
{
switch (len) {
case 1:
return *p;
case 2:
return uint2korr(p);
case 3:
return uint3korr(p);
case 4:
return uint4korr(p);
case 8:
return uint8korr(p);
default:
return 0;
}
}
static inline int net_field_size(uchar *p)
{
if (*p <= 251)
return 1;
if (*p == 252)
return 3;
if (*p == 253)
return 4;
return 9;
}
static inline int rpl_bit_size(uint32_t x)
{
int bits= 1;
while (x >>= 1)
bits++;
return bits;
}
static inline int rpl_byte_size(uint32_t x)
{
int bits= rpl_bit_size(x);
return (bits + 7) / 8;
}
void rpl_set_error(MARIADB_RPL *rpl,
unsigned int error_nr,
const char *format,
...)
{
va_list ap;
const char *errmsg;
return;
if (!format)
{
if (error_nr >= CR_MIN_ERROR && error_nr <= CR_MYSQL_LAST_ERROR)
errmsg= ER(error_nr);
else if (error_nr >= CER_MIN_ERROR && error_nr <= CR_MARIADB_LAST_ERROR)
errmsg= CER(error_nr);
else
errmsg= ER(CR_UNKNOWN_ERROR);
}
rpl->error_no= error_nr;
va_start(ap, format);
vsnprintf(rpl->error_msg, MYSQL_ERRMSG_SIZE - 1,
format ? format : errmsg, ap);
va_end(ap);
/* For backward compatibility we also need to set a connection
error, if we read from primary instead of file */
if (rpl->mysql)
{
my_set_error(rpl->mysql, error_nr, SQLSTATE_UNKNOWN, rpl->error_msg);
}
}
const char * STDCALL mariadb_rpl_error(MARIADB_RPL *rpl)
{
return rpl->error_msg;
}
uint32_t STDCALL mariadb_rpl_errno(MARIADB_RPL *rpl)
{
return rpl->error_no;
}
uint8_t rpl_parse_opt_metadata(MARIADB_RPL_EVENT *event, const uchar *buffer, size_t length)
{
const uchar *pos= buffer, *end= buffer + length;
struct st_mariadb_rpl_table_map_event *tm_event= (struct st_mariadb_rpl_table_map_event *)&event->event;
if (event->event_type != TABLE_MAP_EVENT)
return 1;
while (pos < end)
{
uint8_t meta_type= *pos++;
uint32_t len;
RPL_CHECK_FIELD_LENGTH((uchar *)pos, end);
len= net_field_length((uchar **)&pos);
RPL_CHECK_POS(pos, end,len);
switch(meta_type)
{
case SIGNEDNESS:
tm_event->signed_indicator= (uchar *)pos;
pos+= len;
break;
case DEFAULT_CHARSET:
tm_event->default_charset= *pos;
pos+= len;
break;
case COLUMN_CHARSET:
tm_event->column_charsets.data= pos;
tm_event->column_charsets.length= len;
pos+= len;
break;
case COLUMN_NAME:
tm_event->column_names.data= pos;
tm_event->column_names.length= len;
pos+= len;
break;
case SIMPLE_PRIMARY_KEY:
tm_event->simple_primary_keys.data= pos;
tm_event->simple_primary_keys.length= len;
pos+= len;
break;
case PRIMARY_KEY_WITH_PREFIX:
tm_event->prefixed_primary_keys.data= pos;
tm_event->prefixed_primary_keys.length= len;
pos+= len;
break;
case GEOMETRY_TYPE:
{
tm_event->geometry_types.data= pos;
tm_event->geometry_types.length= len;
pos+= len;
break;
}
/* Default character set used by all columns */
case ENUM_AND_SET_DEFAULT_CHARSET:
tm_event->enum_set_default_charset= *pos;
pos+= len;
break;
case ENUM_AND_SET_COLUMN_CHARSET:
tm_event->enum_set_column_charsets.data= pos;
tm_event->enum_set_column_charsets.length= len;
pos+= len;
break;
case SET_STR_VALUE:
tm_event->set_values.data= pos;
tm_event->set_values.length= len;
pos+= len;
break;
case ENUM_STR_VALUE:
tm_event->enum_values.data= pos;
tm_event->enum_values.length= len;
pos+= len;
break;
default:
rpl_set_error(event->rpl, CR_BINLOG_ERROR, 0, RPL_ERR_POS(event->rpl), "Unknown/unsupported event type");
pos+= len;
break;
}
}
return 0;
malformed_packet:
return 1;
}
static void *ma_calloc_root(void *memroot, size_t len)
{
void *p;
if ((p= ma_alloc_root(memroot, len)))
memset(p, 0, len);
return p;
}
static void rpl_set_string_and_len(MARIADB_STRING *s,
unsigned char *buffer,
size_t len)
{
if (!buffer || !len)
{
s->length= 0;
return;
}
s->str= (char *)buffer;
s->length= len;
}
static uint8_t rpl_alloc_set_string_and_len(MARIADB_RPL_EVENT *event,
MARIADB_STRING *s,
void *buffer,
size_t len)
{
if (!buffer || !len)
{
s->length= 0;
return 0;
}
if (!(s->str = (char *)ma_alloc_root(&event->memroot, len)))
return 1;
memcpy(s->str, buffer, len);
s->length= len;
return 0;
}
static uint8_t rpl_metadata_size(enum enum_field_types field_type)
{
switch (field_type) {
case MYSQL_TYPE_DOUBLE:
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_DATETIME2:
case MYSQL_TYPE_TIMESTAMP2:
case MYSQL_TYPE_TIME2:
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
return 1;
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_SET:
case MYSQL_TYPE_NEWDECIMAL:
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_BIT:
return 2;
default:
return 0;
}
}
static uint8_t ma_rpl_get_second_part(MYSQL_TIME *tm, uchar *ptr, uchar *metadata)
{
switch(metadata[0])
{
case 0:
tm->second_part= 0;
return 0;
case 1:
case 2:
tm->second_part= (uint32_t)ptr[0] * 10000;
return 1;
case 3:
case 4:
tm->second_part= myisam_sint2korr(ptr) * 100;
return 2;
case 5:
case 6:
tm->second_part= myisam_sint3korr(ptr);
return 3;
default:
return 0;
}
}
MARIADB_RPL_ROW * STDCALL
mariadb_rpl_extract_rows(MARIADB_RPL *rpl,
MARIADB_RPL_EVENT *tm_event,
MARIADB_RPL_EVENT *row_event)
{
uchar *start, *pos, *end;
MARIADB_RPL_ROW *f_row= NULL, *p_row= NULL, *c_row= NULL;
uint32_t column_count;
if (!rpl || !tm_event || !row_event)
return NULL;
if (tm_event->event_type != TABLE_MAP_EVENT || !(IS_ROW_EVENT(row_event)))
{
rpl_set_error(rpl, CR_BINLOG_ERROR, 0, RPL_ERR_POS(rpl), "Event with wrong event type passed.");
return NULL;
}
if (row_event->event.rows.table_id != tm_event->event.table_map.table_id)
{
rpl_set_error(rpl, CR_BINLOG_ERROR, 0, RPL_ERR_POS(rpl), "table_id in table_map event differs.");
return NULL;
}
if (!row_event->event.rows.row_data_size ||
!row_event->event.rows.row_data)
{
rpl_set_error(rpl, CR_BINLOG_ERROR, 0, "Row event has no data.");
return NULL;
}
column_count= tm_event->event.table_map.column_count;
start= pos = row_event->event.rows.row_data;
end= start + row_event->event.rows.row_data_size;
while (pos < end)
{
uchar *n_bitmap;
uchar *metadata= (uchar *)tm_event->event.table_map.metadata.str;
if (!(c_row = (MARIADB_RPL_ROW *)ma_calloc_root(&row_event->memroot, sizeof(MARIADB_RPL_ROW))) ||
!(c_row->columns= (MARIADB_RPL_VALUE *)ma_calloc_root(&row_event->memroot,
sizeof(MARIADB_RPL_VALUE) * column_count)))
{
rpl_set_error(rpl, CR_OUT_OF_MEMORY, 0);
return NULL;
}
if (!f_row)
f_row= c_row;
if (p_row)
p_row->next= c_row;
c_row->column_count= column_count;
n_bitmap= pos;
pos+= (column_count + 7) / 8;
for (uint32_t i= 0; i < column_count; i++)
{
MARIADB_RPL_VALUE *column= &c_row->columns[i];
column->field_type= (uchar)tm_event->event.table_map.column_types.str[i];
/* enum, set and string types are stored as string - first metadata
byte contains real_type, second byte contains the length */
if (column->field_type == MYSQL_TYPE_STRING)
{
if (metadata[0] == MYSQL_TYPE_ENUM || metadata[0] == MYSQL_TYPE_SET)
column->field_type = metadata[0];
}
if ((n_bitmap[i / 8] >> (i % 8)) & 1)
{
column->is_null= 1;
metadata+= rpl_metadata_size(column->field_type);
continue;
}
if (column->field_type == MYSQL_TYPE_BLOB)
{
switch(metadata[0])
{
case 1:
column->field_type= MYSQL_TYPE_TINY_BLOB;
break;
case 3:
column->field_type= MYSQL_TYPE_MEDIUM_BLOB;
break;
case 4:
column->field_type= MYSQL_TYPE_LONG_BLOB;
break;
default:
break;
}
}
switch (column->field_type) {
case MYSQL_TYPE_TINY:
column->val.ll= sint1korr(pos);
column->val.ull= uint1korr(pos);
pos++;
break;
case MYSQL_TYPE_YEAR:
column->val.ull= uint1korr(pos++) + 1900;
break;
case MYSQL_TYPE_SHORT:
column->val.ll= sint2korr(pos);
column->val.ull= uint2korr(pos);
pos+= 2;
break;
case MYSQL_TYPE_INT24:
column->val.ll= sint3korr(pos);
column->val.ull= uint3korr(pos);
pos+= 3;
break;
case MYSQL_TYPE_LONG:
column->val.ll= sint4korr(pos);
column->val.ull= uint4korr(pos);
pos+= 4;
break;
case MYSQL_TYPE_LONGLONG:
column->val.ll= sint8korr(pos);
column->val.ull= uint8korr(pos);
pos+= 8;
break;
case MYSQL_TYPE_NEWDECIMAL:
{
uint8_t precision= *metadata++;
uint8_t scale= *metadata++;
uint32_t bin_size;
decimal dec;
char str[200];
char buf[100];
int s_len= sizeof(str) - 1;
dec.buf= (void *)buf;
dec.len= sizeof(buf) / sizeof(decimal_digit);
bin_size= decimal_bin_size(precision, scale);
bin2decimal((char *)pos, &dec, precision, scale);
decimal2string(&dec, str, &s_len);
pos+= bin_size;
if (rpl_alloc_set_string_and_len(row_event, &column->val.str, str, s_len))
goto mem_error;
break;
}
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
{
uint8_t flen= *metadata++;
if (flen == 4)
{
float4get(column->val.f, pos);
}
if (flen == 8)
{
float8get(column->val.d, pos);
}
pos+= flen;
break;
}
case MYSQL_TYPE_BIT:
{
uint8_t num_bits= (metadata[0] & 0xFF) + metadata[1] * 8;
uint8_t b_len= (num_bits + 7) / 8;
metadata+= 2;
if (rpl_alloc_set_string_and_len(row_event, &column->val.str, pos, b_len))
goto mem_error;
pos+= b_len;
break;
}
case MYSQL_TYPE_TIMESTAMP:
{
column->val.ull= uint4korr(pos);
pos+= 4;
break;
}
case MYSQL_TYPE_TIMESTAMP2:
{
char tmp[20];
uint32_t p1= uint4korr(pos);
uint8_t f_len= *metadata++;
uint32_t p2;
pos+= 4;
p2= (uint32_t)uintNkorr(f_len, pos);
pos+= f_len;
sprintf(tmp, "%d.%d", p1, p2);
if (rpl_alloc_set_string_and_len(row_event, &column->val.str, tmp, strlen(tmp)))
goto mem_error;
break;
}
case MYSQL_TYPE_DATE:
{
MYSQL_TIME *tm= &column->val.tm;
uint32_t d_val= uint3korr(pos);
pos+= 3;
tm->year= (int)(d_val / (16 * 32));
tm->month= (int)(d_val / 32 % 16);
tm->day= d_val % 32;
tm->time_type= MYSQL_TIMESTAMP_DATE;
break;
}
case MYSQL_TYPE_TIME2:
{
MYSQL_TIME *tm= &column->val.tm;
int64_t t_val= myisam_uint3korr(pos) - 0x800000LL;
if ((tm->neg = t_val < 0))
t_val= -t_val;
pos+= 3;
tm->hour= (t_val >> 12) % (1 << 10);
tm->minute= (t_val >> 6) % (1 << 6);
tm->second= t_val % (1 << 6);
pos+= ma_rpl_get_second_part(tm, pos, metadata);
metadata++;
tm->time_type= MYSQL_TIMESTAMP_TIME;
column->field_type= MYSQL_TYPE_TIME;
break;
}
case MYSQL_TYPE_DATETIME2:
{
MYSQL_TIME *tm= &column->val.tm;
uint64_t dt_val= mi_uint5korr(pos) - 0x8000000000LL,
date_part, time_part;
pos+= 5;
date_part= dt_val >> 17;
time_part= dt_val % (1 << 17);
tm->day= (unsigned int)date_part % (1 << 5);
tm->month= (unsigned int)(date_part >> 5) % 13;
tm->year= (unsigned int)(date_part >> 5) / 13;
tm->second= time_part % (1 << 6);
tm->minute= (time_part >> 6) % (1 << 6);
tm->hour= (uint32_t)(time_part >> 12);
tm->time_type= MYSQL_TIMESTAMP_DATETIME;
column->field_type= MYSQL_TYPE_DATETIME;
pos+= ma_rpl_get_second_part(tm, pos, metadata);
metadata++;
break;
}
case MYSQL_TYPE_STRING:
{
uint8_t s_len= metadata[2];
metadata+= 2;
if (rpl_alloc_set_string_and_len(row_event, &column->val.str, pos, s_len))
goto mem_error;
pos+= s_len;
break;
}
case MYSQL_TYPE_ENUM:
{
uint8_t e_len= metadata[2];
metadata+= 2;
column->val.ull= uintNkorr(e_len, pos);
pos+= e_len;
break;
}
case MYSQL_TYPE_SET:
{
uint8_t e_len= metadata[2];
metadata+= 2;
column->val.ull= uintNkorr(e_len, pos);
pos+= e_len;
break;
}
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_GEOMETRY:
{
uint8_t h_len= *metadata++;
uint64_t b_len= uintNkorr(h_len, pos);
pos+= h_len;
if (rpl_alloc_set_string_and_len(row_event, &column->val.str, pos, (size_t)b_len))
goto mem_error;
pos+= b_len;
break;
}
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_VAR_STRING:
{
uint32_t s_len= uint2korr(metadata);
uint8_t byte_len= rpl_byte_size(s_len);
metadata+= 2;
s_len= (uint32_t)uintNkorr(byte_len, pos);
pos+= byte_len;
if (rpl_alloc_set_string_and_len(row_event, &column->val.str, pos, s_len))
goto mem_error;
pos+= s_len;
break;
}
case MYSQL_TYPE_TIME:
{
MYSQL_TIME *tm= &column->val.tm;
uint64_t t= uint8korr(pos);
pos+= 8;
tm->hour= (unsigned int)(t/100)/100;
tm->minute= (unsigned int)(t/100) % 100;
tm->second= (unsigned int)t % 100;
tm->time_type= MYSQL_TIMESTAMP_TIME;
break;
}
case MYSQL_TYPE_DATETIME:
{
MYSQL_TIME *tm= &column->val.tm;
uint64_t t= uint8korr(pos);
uint32_t d_val= (uint32_t)t / 1000000,
t_val= (uint32_t)t % 1000000;
pos+= 8;
tm->year= (unsigned int)(d_val / 100) / 100;
tm->month= (unsigned int)(d_val / 100) % 100;
tm->day= (unsigned int)d_val % 100;
tm->hour= (t_val/100)/100;
tm->minute= (t_val/100) % 100;
tm->second= t_val % 100;
tm->time_type= MYSQL_TIMESTAMP_DATETIME;
break;
}
default:
break;
}
}
p_row= c_row;
}
return f_row;
mem_error:
rpl_set_error(rpl, CR_OUT_OF_MEMORY, 0);
return NULL;
}
MARIADB_RPL * STDCALL mariadb_rpl_init_ex(MYSQL *mysql, unsigned int version)
{
MARIADB_RPL *rpl;
if (version < MARIADB_RPL_REQUIRED_VERSION ||
version > MARIADB_RPL_VERSION)
{
if (mysql)
my_set_error(mysql, CR_VERSION_MISMATCH, SQLSTATE_UNKNOWN, 0, version,
MARIADB_RPL_VERSION, MARIADB_RPL_REQUIRED_VERSION);
return 0;
}
if (!(rpl= (MARIADB_RPL *)calloc(1, sizeof(MARIADB_RPL))))
{
SET_CLIENT_ERROR(mysql, CR_OUT_OF_MEMORY, SQLSTATE_UNKNOWN, 0);
return 0;
}
rpl->version= version;
if ((rpl->mysql= mysql))
{
MYSQL_RES *result;
if (!mysql_query(mysql, "select @@binlog_checksum"))
{
if ((result= mysql_store_result(mysql)))
{
MYSQL_ROW row= mysql_fetch_row(result);
if (!strcmp(row[0], "CRC32"))
{
rpl->artificial_checksum= 1;
}
mysql_free_result(result);
}
}
}
/* recommended way to set replica host and port is via rpl_optionsv(), however if
hostname and port was set via mysql_optionsv, we set it here to rpl */
if (rpl->mysql && rpl->mysql->options.extension && rpl->mysql->options.extension->rpl_host)
{
mariadb_rpl_optionsv(rpl, MARIADB_RPL_HOST, rpl->mysql->options.extension->rpl_host);
mariadb_rpl_optionsv(rpl, MARIADB_RPL_PORT, rpl->mysql->options.extension->rpl_port);
}
return rpl;
}
void STDCALL mariadb_free_rpl_event(MARIADB_RPL_EVENT *event)
{
if (event)
{
ma_free_root(&event->memroot, MYF(0));
free(event);
}
}
int STDCALL mariadb_rpl_open(MARIADB_RPL *rpl)
{
unsigned char *ptr, *buf;
if (!rpl)
return 1;
/* COM_BINLOG_DUMP:
Ofs Len Data
0 1 COM_BINLOG_DUMP
1 4 position
5 2 flags
7 4 server id
11 * filename
* = filename length
*/
rpl_clear_error(rpl);
/* if replica was specified, we will register replica via
COM_REGISTER_SLAVE */
if (rpl->host)
{
/* Protocol:
Ofs Len Data
0 1 COM_REGISTER_SLAVE
1 4 server id
5 1 replica host name length
6 <n> replica host name
1 user name length
<n> user name
1 password length
<n> password
2 replica port
4 replication rank (unused)
4 source server id (unused)
*/
unsigned char *p, buffer[1024];
size_t len= MIN(strlen(rpl->host), 255);
p= buffer;
int4store(p, rpl->server_id);
p+= 4;
*p++= (unsigned char)len;
memcpy(p, rpl->host, len);
p+= len;
/* Don't send user, password, rank and server_id */
*p++= 0;
*p++= 0;
int2store(p, rpl->port);
p+= 2;
int4store(p, 0);
p+= 4;
int4store(p, 0);
p+= 4;
if (ma_simple_command(rpl->mysql, COM_REGISTER_SLAVE, (const char *)buffer, p - buffer, 0, 0))
{
rpl_set_error(rpl, mysql_errno(rpl->mysql), 0, NULL, 0);
return 1;
}
}
if (rpl->mysql)
{
uint32_t replica_id= rpl->server_id;
ptr= buf= (unsigned char *)alloca(rpl->filename_length + 11);
if (!ptr)
{
rpl_set_error(rpl, CR_OUT_OF_MEMORY, 0);
}
if (rpl->is_semi_sync)
{
if (mysql_query(rpl->mysql, "SET @rpl_semi_sync_slave=1"))
{
rpl_set_error(rpl, mysql_errno(rpl->mysql), 0, mysql_error(rpl->mysql));
return 1;
}
}
else {
MYSQL_RES* result;
MYSQL_ROW row;
if (mysql_query(rpl->mysql, "SELECT @rpl_semi_sync_slave=1"))
{
rpl_set_error(rpl, mysql_errno(rpl->mysql), 0, mysql_error(rpl->mysql));
return 1;
}
if ((result = mysql_store_result(rpl->mysql)))
{
if ((row = mysql_fetch_row(result)))
rpl->is_semi_sync = (row[0] != NULL && row[0][0] == '1');
mysql_free_result(result);
}
}
int4store(ptr, (unsigned int)rpl->start_position);
ptr+= 4;
int2store(ptr, rpl->flags);
ptr+= 2;
if ((rpl->flags & MARIADB_RPL_BINLOG_DUMP_NON_BLOCK) && !replica_id)
replica_id= 1;
int4store(ptr, replica_id);
ptr+= 4;
memcpy(ptr, rpl->filename, rpl->filename_length);
ptr+= rpl->filename_length;
return (ma_simple_command(rpl->mysql, COM_BINLOG_DUMP, (const char *)buf, ptr - buf, 1, 0));
} else
{
char *buf[RPL_BINLOG_MAGIC_SIZE];
MYSQL mysql;
/* Semi sync doesn't work when processing files */
rpl->is_semi_sync = 0;
if (rpl->fp)
ma_close(rpl->fp);
if (!(rpl->fp= ma_open((const char *)rpl->filename, "r", &mysql)))
{
rpl_set_error(rpl, CR_FILE_NOT_FOUND, 0, rpl->filename, errno);
return errno;
}
if (ma_read(buf, 1, RPL_BINLOG_MAGIC_SIZE, rpl->fp) != 4)
{
rpl_set_error(rpl, CR_FILE_READ, 0, rpl->filename, errno);
return errno;
}
/* check if it is a valid binlog file */
if (memcmp(buf, RPL_BINLOG_MAGIC, RPL_BINLOG_MAGIC_SIZE) != 0)
{
rpl_set_error(rpl, CR_BINLOG_INVALID_FILE, 0, rpl->filename, errno);
return errno;
}
return 0;
}
}
static int ma_set_rpl_filename(MARIADB_RPL *rpl, const unsigned char *filename, size_t len)
{
if (!rpl)
return 1;
free(rpl->filename);
if (!(rpl->filename= (char *)malloc(len)))
return 1;
memcpy(rpl->filename, filename, len);
rpl->filename_length= (uint32_t)len;
return 0;
}
/*
* Returns compression info:
* Ofs Len
* 0 1 header:
* ofs & 0x07 >> 4: algorithm, always 0=zlib
* ofs & 0x07: header size
* 1 header size uncompressed length in MyISAM format.
*/
static uint32_t get_compression_info(const unsigned char *buf,
uint8_t *algorithm,
uint8_t *header_size)
{
uint8_t alg, header;
uint32 len= 0;
if (!algorithm)
algorithm= &alg;
if (!header_size)
header_size= &header;
*header_size= 0;
*algorithm= 0;
if (!buf)
return len;
if ((buf[0] & 0xe0) != 0x80)
return len;
*header_size= buf[0] & 0x07;
*algorithm = (buf[0] & 0x07) >> 4;
buf++;
/* Attention: we can't use uint*korr, here, we need myisam macros since
length is stored in high byte first order
*/
switch(*header_size) {
case 1:
len= *buf;
break;
case 2:
len= myisam_uint2korr(buf);
break;
case 3:
len= myisam_uint3korr(buf);
break;
case 4:
len= myisam_uint4korr(buf);
break;
default:
len= 0;
break;
}
*header_size += 1;
return len;
}
static uint8_t mariadb_rpl_send_semisync_ack(MARIADB_RPL* rpl, MARIADB_RPL_EVENT* event)
{
size_t buf_size = 0;
uchar* buf;
if (!rpl)
return 1;
if (!event)
{
rpl_set_error(rpl, CR_BINLOG_SEMI_SYNC_ERROR, 0, "Invalid event");
return 1;
}
if (!rpl->is_semi_sync)
{
rpl_set_error(rpl, CR_BINLOG_SEMI_SYNC_ERROR, 0, "semi synchronous replication is not enabled");
return 1;
}
if (!event->is_semi_sync || !event->semi_sync_flags != SEMI_SYNC_ACK_REQ)
{
rpl_set_error(rpl, CR_BINLOG_SEMI_SYNC_ERROR, 0, "This event doesn't require to send semi synchronous acknoledgement");
return 1;
}
buf_size = rpl->filename_length + 9;
buf = alloca(buf_size);
buf[0] = SEMI_SYNC_INDICATOR;
int8store(buf + 1, event->next_event_pos);
memcpy(buf + 9, rpl->filename, rpl->filename_length);
ma_net_clear(&rpl->mysql->net);
if (ma_net_write(&rpl->mysql->net, buf, buf_size) ||
(ma_net_flush(&rpl->mysql->net)))
{
rpl_set_error(rpl, CR_CONNECTION_ERROR, 0);
return 1;
}
return 0;
}
MARIADB_RPL_EVENT * STDCALL mariadb_rpl_fetch(MARIADB_RPL *rpl, MARIADB_RPL_EVENT *event)
{
unsigned char *ev= 0;
unsigned char *checksum_start= 0;
unsigned char *ev_start= 0;
unsigned char *ev_end= 0;
size_t len= 0;
MARIADB_RPL_EVENT *rpl_event= 0;
if (!rpl || (!rpl->mysql && !rpl->fp))
return 0;