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/* Copyright (c) 2008 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "semisync_slave.h"
char rpl_semi_sync_slave_enabled;
char rpl_semi_sync_slave_status= 0;
unsigned long rpl_semi_sync_slave_trace_level;
int ReplSemiSyncSlave::initObject()
{
int result= 0;
const char *kWho = "ReplSemiSyncSlave::initObject";
if (init_done_)
{
fprintf(stderr, "%s called twice\n", kWho);
return 1;
}
init_done_ = true;
/* References to the parameter works after set_options(). */
setSlaveEnabled(rpl_semi_sync_slave_enabled);
setTraceLevel(rpl_semi_sync_slave_trace_level);
return result;
}
int ReplSemiSyncSlave::slaveReadSyncHeader(const char *header,
unsigned long total_len,
bool *need_reply,
const char **payload,
unsigned long *payload_len)
{
const char *kWho = "ReplSemiSyncSlave::slaveReadSyncHeader";
int read_res = 0;
function_enter(kWho);
if ((unsigned char)(header[0]) == kPacketMagicNum)
{
*need_reply = (header[1] & kPacketFlagSync);
*payload_len = total_len - 2;
*payload = header + 2;
if (trace_level_ & kTraceDetail)
sql_print_information("%s: reply - %d", kWho, *need_reply);
}
else
{
sql_print_error("Missing magic number for semi-sync packet, packet "
"len: %lu", total_len);
read_res = -1;
}
return function_exit(kWho, read_res);
}
int ReplSemiSyncSlave::slaveStart(Binlog_relay_IO_param *param)
{
bool semi_sync= getSlaveEnabled();
sql_print_information("Slave I/O thread: Start %s replication to\
master '%s@%s:%d' in log '%s' at position %lu",
semi_sync ? "semi-sync" : "asynchronous",
param->user, param->host, param->port,
param->master_log_name[0] ? param->master_log_name : "FIRST",
(unsigned long)param->master_log_pos);
if (semi_sync && !rpl_semi_sync_slave_status)
rpl_semi_sync_slave_status= 1;
return 0;
}
int ReplSemiSyncSlave::slaveStop(Binlog_relay_IO_param *param)
{
if (rpl_semi_sync_slave_status)
rpl_semi_sync_slave_status= 0;
if (mysql_reply)
mysql_close(mysql_reply);
mysql_reply= 0;
return 0;
}
int ReplSemiSyncSlave::slaveReply(MYSQL *mysql,
const char *binlog_filename,
my_off_t binlog_filepos)
{
const char *kWho = "ReplSemiSyncSlave::slaveReply";
NET *net= &mysql->net;
uchar reply_buffer[REPLY_MAGIC_NUM_LEN
+ REPLY_BINLOG_POS_LEN
+ REPLY_BINLOG_NAME_LEN];
int reply_res, name_len = strlen(binlog_filename);
function_enter(kWho);
/* Prepare the buffer of the reply. */
reply_buffer[REPLY_MAGIC_NUM_OFFSET] = kPacketMagicNum;
int8store(reply_buffer + REPLY_BINLOG_POS_OFFSET, binlog_filepos);
memcpy(reply_buffer + REPLY_BINLOG_NAME_OFFSET,
binlog_filename,
name_len + 1 /* including trailing '\0' */);
if (trace_level_ & kTraceDetail)
sql_print_information("%s: reply (%s, %lu)", kWho,
binlog_filename, (ulong)binlog_filepos);
net_clear(net, 0);
/* Send the reply. */
reply_res = my_net_write(net, reply_buffer,
name_len + REPLY_BINLOG_NAME_OFFSET);
if (!reply_res)
{
reply_res = net_flush(net);
if (reply_res)
sql_print_error("Semi-sync slave net_flush() reply failed");
}
else
{
sql_print_error("Semi-sync slave send reply failed: %s (%d)",
net->last_error, net->last_errno);
}
return function_exit(kWho, reply_res);
}
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