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Slave.cpp
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/* Copyright 2011 ZAO "Begun".
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 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 Lesser General Public License for more
* details.
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Slave.h"
#include "SlaveStats.h"
#include "Logging.h"
#include "nanomysql.h"
namespace slave
{
unsigned char *net_store_data(unsigned char *to, const unsigned char *from, unsigned int length)
{
to = net_store_length_fast(to,length);
::memcpy(to,from,length);
return to+length;
}
unsigned char *net_store_length_fast(unsigned char *pkg, unsigned int length)
{
unsigned char *packet=(unsigned char*) pkg;
if (length < 251)
{
*packet=(unsigned char) length;
return packet+1;
}
*packet++=252;
int2store(packet,(unsigned int) length);
return packet+2;
}
void Slave::init()
{
LOG_TRACE(log, "Initializing libslave...");
check_master_version();
check_master_binlog_format();
ext_state.loadMasterInfo( m_master_info.master_log_name, m_master_info.master_log_pos);
LOG_TRACE(log, "Libslave initialized OK");
}
void Slave::close_connection()
{
::shutdown(mysql.net.fd, SHUT_RDWR);
::close(mysql.net.fd);
}
void Slave::createDatabaseStructure_(table_order_t& tabs, RelayLogInfo& rli) const {
LOG_TRACE(log, "enter: createDatabaseStructure");
nanomysql::Connection conn(m_master_info.host.c_str(), m_master_info.user.c_str(),
m_master_info.password.c_str(), "", m_master_info.port);
const collate_map_t collate_map = readCollateMap(conn);
for (table_order_t::const_iterator it = tabs.begin(); it != tabs.end(); ++ it) {
LOG_INFO( log, "Creating database structure for: " << it->first << ", Creating table for: " << it->second );
createTable(rli, it->first, it->second, collate_map, conn);
}
LOG_TRACE(log, "exit: createDatabaseStructure");
}
void Slave::createTable(RelayLogInfo& rli,
const std::string& db_name, const std::string& tbl_name,
const collate_map_t& collate_map, nanomysql::Connection& conn) const {
LOG_TRACE(log, "enter: createTable " << db_name << " " << tbl_name);
nanomysql::Connection::result_t res;
conn.query("SHOW FULL COLUMNS FROM " + tbl_name + " IN " + db_name);
conn.store(res);
boost::shared_ptr<Table> table(new Table(db_name, tbl_name));
LOG_DEBUG(log, "Created new Table object: database:" << db_name << " table: " << tbl_name );
for (nanomysql::Connection::result_t::const_iterator i = res.begin(); i != res.end(); ++i) {
//row.at(0) - field name
//row.at(1) - field type
//row.at(2) - collation
//row.at(3) - can be null
std::map<std::string,nanomysql::field>::const_iterator z = i->find("Field");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): DESCRIBE query did not return 'Field'");
std::string name = z->second.data;
z = i->find("Type");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): DESCRIBE query did not return 'Type'");
std::string type = z->second.data;
z = i->find("Null");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): DESCRIBE query did not return 'Null'");
std::string extract_field;
// Extract field type
for (size_t tmpi = 0; tmpi < type.size(); ++tmpi) {
if (!((type[tmpi] >= 'a' && type[tmpi] <= 'z') ||
(type[tmpi] >= 'A' && type[tmpi] <= 'Z'))) {
extract_field = type.substr(0, tmpi);
break;
}
if (tmpi == type.size()-1) {
extract_field = type;
break;
}
}
if (extract_field.empty())
throw std::runtime_error("Slave::create_table(): Regexp error, type not found");
collate_info ci;
if ("varchar" == extract_field || "char" == extract_field)
{
z = i->find("Collation");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): DESCRIBE query did not return 'Collation' for field '" + name + "'");
const std::string collate = z->second.data;
collate_map_t::const_iterator it = collate_map.find(collate);
if (collate_map.end() == it)
throw std::runtime_error("Slave::create_table(): cannot find collate '" + collate + "' from field "
+ name + " type " + type + " in collate info map");
ci = it->second;
LOG_DEBUG(log, "Created column: name-type: " << name << " - " << type
<< " Field type: " << extract_field << " Collation: " << ci.name);
}
else
LOG_DEBUG(log, "Created column: name-type: " << name << " - " << type
<< " Field type: " << extract_field );
PtrField field;
if (extract_field == "int")
field = PtrField(new Field_long(name, type));
else if (extract_field == "double")
field = PtrField(new Field_double(name, type));
else if (extract_field == "float")
field = PtrField(new Field_float(name, type));
else if (extract_field == "timestamp")
field = PtrField(new Field_timestamp(name, type));
else if (extract_field == "datetime")
field = PtrField(new Field_datetime(name, type));
else if (extract_field == "date")
field = PtrField(new Field_date(name, type));
else if (extract_field == "year")
field = PtrField(new Field_year(name, type));
else if (extract_field == "time")
field = PtrField(new Field_time(name, type));
else if (extract_field == "enum")
field = PtrField(new Field_enum(name, type));
else if (extract_field == "set")
field = PtrField(new Field_set(name, type));
else if (extract_field == "varchar")
field = PtrField(new Field_varstring(name, type, ci));
else if (extract_field == "char")
field = PtrField(new Field_varstring(name, type, ci));
else if (extract_field == "tinyint")
field = PtrField(new Field_tiny(name, type));
else if (extract_field == "smallint")
field = PtrField(new Field_short(name, type));
else if (extract_field == "mediumint")
field = PtrField(new Field_medium(name, type));
else if (extract_field == "bigint")
field = PtrField(new Field_longlong(name, type));
else if (extract_field == "text")
field = PtrField(new Field_blob(name, type));
else if (extract_field == "tinytext")
field = PtrField(new Field_tinyblob(name, type));
else if (extract_field == "mediumtext")
field = PtrField(new Field_mediumblob(name, type));
else if (extract_field == "longtext")
field = PtrField(new Field_longblob(name, type));
else if (extract_field == "blob")
field = PtrField(new Field_blob(name, type));
else if (extract_field == "tinyblob")
field = PtrField(new Field_tinyblob(name, type));
else if (extract_field == "mediumblob")
field = PtrField(new Field_mediumblob(name, type));
else if (extract_field == "longblob")
field = PtrField(new Field_longblob(name, type));
else {
LOG_ERROR(log, "createTable: class name don't exist: " << extract_field );
throw std::runtime_error("class name does not exist: " + extract_field);
}
table->fields.push_back(field);
}
rli.setTable(tbl_name, db_name, table);
}
struct raii_mysql_connector {
MYSQL* mysql;
MasterInfo& m_master_info;
ExtStateIface &ext_state;
raii_mysql_connector(MYSQL* m, MasterInfo& mmi, ExtStateIface &state) : mysql(m), m_master_info(mmi), ext_state(state) {
connect(false);
}
~raii_mysql_connector() {
end_server(mysql);
mysql_close(mysql);
}
void connect(bool reconnect) {
LOG_TRACE(log, "enter: connect_to_master");
ext_state.setConnecting();
if (reconnect) {
end_server(mysql);
mysql_close(mysql);
}
if (!(mysql_init(mysql))) {
throw std::runtime_error("Slave::reconnect() : mysql_init() : could not initialize mysql structure");
}
unsigned int timeout = 60;
mysql_options(mysql, MYSQL_OPT_CONNECT_TIMEOUT, &timeout); //(const char*) slave_net_timeout.c_str());
/* Timeout for reads from server (works only for TCP/IP connections, and only for Windows prior to MySQL 4.1.22).
* You can this option so that a lost connection can be detected earlier than the TCP/IP
* Close_Wait_Timeout value of 10 minutes. Added in 4.1.1.
*/
mysql_options(mysql, MYSQL_OPT_READ_TIMEOUT, &timeout); //(const char*) slave_net_timeout.c_str());
bool was_error = false;
while (mysql_real_connect(mysql,
m_master_info.host.c_str(),
m_master_info.user.c_str(),
m_master_info.password.c_str(), 0, m_master_info.port, 0, 0)
== 0) {
ext_state.setConnecting();
if(!was_error) {
LOG_ERROR(log, "Couldn't connect to mysql master " << m_master_info.host << ":" << m_master_info.port);
was_error = true;
}
LOG_TRACE(log, "try connect to master");
LOG_TRACE(log, "connect_retry = " << m_master_info.connect_retry << ", reconnect = " << reconnect);
//
::sleep(m_master_info.connect_retry);
}
if(was_error)
LOG_INFO(log, "Successfully connected to " << m_master_info.host << ":" << m_master_info.port);
mysql->reconnect = 1;
LOG_TRACE(log, "exit: connect_to_master");
}
};
void Slave::get_remote_binlog( const boost::function< bool() >& _interruptFlag) {
try {
int count_packet = 0;
generateSlaveId();
// Moved to Slave member
// MYSQL mysql;
raii_mysql_connector __conn(&mysql, m_master_info, ext_state);
//connect_to_master(false, &mysql);
register_slave_on_master(&mysql);
connected:
// Ïîëó÷èì ïîçèöèþ áèíëîãà, ñîõðàí¸ííóþ â ext_state ðàíåå, èëè çàãðóçèì å¸
// èç persistent õðàíèëèùà. false â ñëó÷àå, åñëè íå óäàëîñü ïîëó÷èòü ïîçèöèþ.
if( !ext_state.getMasterInfo(
m_master_info.master_log_name,
m_master_info.master_log_pos) ) {
// Åñëè ñîõðàí¸ííîé ðàíåå ïîçèöèè áèíëîãà íåò,
// ïîëó÷àåì ïîñëåäíþþ âåðñèþ áèíëîãà è ñìåùåíèå
std::pair<std::string,unsigned int> row = getLastBinlog();
m_master_info.master_log_name = row.first;
m_master_info.master_log_pos = row.second;
ext_state.setMasterLogNamePos(m_master_info.master_log_name, m_master_info.master_log_pos);
ext_state.saveMasterInfo();
}
LOG_INFO(log, "Starting from binlog_name:binlog_pos : " << m_master_info.master_log_name
<< ":" << m_master_info.master_log_pos );
request_dump(m_master_info.master_log_name, m_master_info.master_log_pos, &mysql);
while (!_interruptFlag()) {
try {
LOG_TRACE(log, "-- reading event --");
unsigned long len = read_event(&mysql);
ext_state.setStateProcessing(true);
count_packet++;
LOG_TRACE(log, "Got event with length: " << len << " Packet number: " << count_packet );
// end of data
if (len == packet_error || len == packet_end_data) {
uint mysql_error_number = mysql_errno(&mysql);
switch(mysql_error_number) {
case ER_NET_PACKET_TOO_LARGE:
LOG_ERROR(log, "Myslave: Log entry on master is longer than max_allowed_packet on "
"slave. If the entry is correct, restart the server with a higher value of "
"max_allowed_packet. max_allowed_packet=" << mysql_error(&mysql) );
break;
case ER_MASTER_FATAL_ERROR_READING_BINLOG: // Îøèáêà -- íåèçâåñòíûé áèíëîã-ôàéë.
LOG_ERROR(log, "Myslave: fatal error reading binlog. " << mysql_error(&mysql) );
break;
case 2013: // Îáðàáîòêà îøèáêè 'Lost connection to MySQL'
LOG_WARNING(log, "Myslave: Error from MySQL: " << mysql_error(&mysql) );
break;
default:
LOG_ERROR(log, "Myslave: Error reading packet from server: " << mysql_error(&mysql)
<< "; mysql_error: " << mysql_errno(&mysql));
break;
}
__conn.connect(true);
goto connected;
} // len == packet_error
// Ok event
if (len == packet_end_data) {
continue;
}
slave::Basic_event_info event;
if (!slave::read_log_event((const char*) mysql.net.read_pos + 1,
len - 1,
event)) {
LOG_TRACE(log, "Skipping unknown event.");
continue;
}
//
LOG_TRACE(log, "Event log position: " << event.log_pos );
if (event.log_pos != 0) {
m_master_info.master_log_pos = event.log_pos;
ext_state.setLastEventTimePos(event.when, event.log_pos);
}
LOG_TRACE(log, "seconds_behind_master: " << (::time(NULL) - event.when) );
// MySQL5.1.23 binlogs can be read only starting from a XID_EVENT
// MySQL5.1.23 ev->log_pos -- the binlog offset
if (event.type == XID_EVENT) {
ext_state.setMasterLogNamePos(m_master_info.master_log_name, m_master_info.master_log_pos);
LOG_TRACE(log, "Got XID event. Using binlog name:pos: "
<< m_master_info.master_log_name << ":" << m_master_info.master_log_pos);
if (m_xid_callback)
m_xid_callback(event.server_id);
} else if (event.type == ROTATE_EVENT) {
slave::Rotate_event_info rei(event.buf, event.event_len);
/*
* new_log_ident - new binlog name
* pos - position of the starting event
*/
LOG_INFO(log, "Got rotate event.");
/* WTF
*/
if (event.when == 0) {
//LOG_TRACE(log, "ROTATE_FAKE");
}
m_master_info.master_log_name = rei.new_log_ident;
m_master_info.master_log_pos = rei.pos; // this will always be equal to 4
ext_state.setMasterLogNamePos(m_master_info.master_log_name, m_master_info.master_log_pos);
LOG_TRACE(log, "ROTATE_EVENT processed OK.");
}
if (process_event(event, m_rli, m_master_info.master_log_pos)) {
LOG_TRACE(log, "Error in processing event.");
}
} catch (const std::exception& _ex ) {
LOG_ERROR(log, "Met exception in get_remote_binlog cycle. Message: " << _ex.what() );
usleep(1000*1000);
continue;
}
} //while
LOG_WARNING(log, "Binlog monitor was stopped. Binlog events are not listened.");
deregister_slave_on_master(&mysql);
} catch (const std::exception & e) {
std::string msg = "[";
msg += ext_state.getMasterLogName();
msg += " : ";
msg += ext_state.getMasterLogPos();
msg += "] ";
msg += e.what();
throw std::runtime_error(msg);
} catch (...) {
std::string msg = "[";
msg += ext_state.getMasterLogName();
msg += " : ";
msg += ext_state.getMasterLogPos();
msg += "] ";
msg += "Unknown exception";
throw std::runtime_error(msg);
}
}
std::map<std::string,std::string> Slave::getRowType(const std::string& db_name,
const std::set<std::string>& tbl_names) const {
nanomysql::Connection conn(m_master_info.host.c_str(), m_master_info.user.c_str(),
m_master_info.password.c_str(), "", m_master_info.port);
nanomysql::Connection::result_t res;
conn.query("SHOW TABLE STATUS FROM " + db_name);
conn.store(res);
std::map<std::string,std::string> ret;
for (nanomysql::Connection::result_t::const_iterator i = res.begin(); i != res.end(); ++i) {
if (i->size() <= 3) {
LOG_ERROR(log, "WARNING: Broken SHOW TABLE STATUS FROM " << db_name);
continue;
}
//row[0] - the table name
//row[3] - row_format
std::map<std::string,nanomysql::field>::const_iterator z = i->find("Name");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): SHOW TABLE STATUS query did not return 'Name'");
std::string name = z->second.data;
z = i->find("Row_format");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): SHOW TABLE STATUS query did not return 'Row_format'");
std::string format = z->second.data;
if (tbl_names.count(name) != 0) {
ret[name] = format;
LOG_DEBUG(log, name << " row_type = " << format);
}
}
return ret;
}
void Slave::register_slave_on_master(MYSQL* mysql) {
uchar buf[1024], *pos= buf;
unsigned int report_host_len=0, report_user_len=0, report_password_len=0;
const char * report_host = "0.0.0.0";
const char* report_user = "begun_slave";
const char* report_password = "begun_slave";
unsigned int report_port = 0;
unsigned long rpl_recovery_rank = 0;
report_host_len= strlen(report_host);
report_user_len= strlen(report_user);
report_password_len= strlen(report_password);
LOG_DEBUG(log, "Register slave on master: m_server_id = " << m_server_id);
int4store(pos, m_server_id);
pos+= 4;
pos= net_store_data(pos, (uchar*)report_host, report_host_len);
pos= net_store_data(pos, (uchar*)report_user, report_user_len);
pos= net_store_data(pos, (uchar*)report_password, report_password_len);
int2store(pos, (unsigned short) report_port);
pos+= 2;
int4store(pos, rpl_recovery_rank);
pos+= 4;
/* The master will fill in master_id */
int4store(pos, 0);
pos+= 4;
if (simple_command(mysql, COM_REGISTER_SLAVE, buf, (size_t) (pos-buf), 0)) {
LOG_ERROR(log, "Unable to register slave.");
throw std::runtime_error("Slave::register_slave_on_master(): Error registring on slave: " +
std::string(mysql_error(mysql)));
}
LOG_TRACE(log, "Success registering slave on master");
}
void Slave::deregister_slave_on_master(MYSQL* mysql) {
LOG_DEBUG(log, "Deregistering slave on master: m_server_id = " << m_server_id << "...");
// Last '1' means 'no checking', otherwise command can hang
simple_command(mysql, COM_QUIT, 0, 0, 1);
}
void Slave::check_master_version() {
nanomysql::Connection conn(m_master_info.host.c_str(), m_master_info.user.c_str(),
m_master_info.password.c_str(), "", m_master_info.port);
nanomysql::Connection::result_t res;
conn.query("SELECT VERSION()");
conn.store(res);
if (res.size() == 1 && res[0].size() == 1) {
std::string tmp = res[0].begin()->second.data;
bool ok = true;
const char* v = tmp.data();
for (int i = 0; i < 3; ++i) {
char* e;
int z = ::strtoul(v, &e, 10);
/* Mysql version >= 5.1.23 */
if ((z >= 5 && i == 0) ||
(z >= 1 && i == 1) ||
(z >= 23 && i == 2)) {
//
} else {
ok = false;
break;
}
if (*e == '\0' || e == v)
break;
v = e+1;
}
/* */
if (ok) {
return;
}
throw std::runtime_error("Slave::check_master_version(): got invalid version: " + tmp);
}
throw std::runtime_error("Slave::check_master_version(): could not SELECT VERSION()");
}
void Slave::check_master_binlog_format() {
nanomysql::Connection conn(m_master_info.host.c_str(), m_master_info.user.c_str(),
m_master_info.password.c_str(), "", m_master_info.port);
nanomysql::Connection::result_t res;
conn.query("SHOW GLOBAL VARIABLES LIKE 'binlog_format'");
conn.store(res);
if (res.size() == 1 && res[0].size() == 2) {
std::map<std::string,nanomysql::field>::const_iterator z = res[0].find("Value");
if (z == res[0].end())
throw std::runtime_error("Slave::create_table(): SHOW GLOBAL VARIABLES query did not return 'Value'");
std::string tmp = z->second.data;
if (tmp == "ROW") {
return;
} else {
throw std::runtime_error("Slave::check_binlog_format(): got invalid binlog format: " + tmp);
}
}
throw std::runtime_error("Slave::check_binlog_format(): Could not SHOW GLOBAL VARIABLES LIKE 'binlog_format'");
}
// This will check if a QUERY_EVENT holds an "ALTER TABLE ..." string.
namespace
{
static bool checkAlterQuery(const std::string& str)
{
//RegularExpression regexp("^\\s*ALTER\\s+TABLE)", RegularExpression::RE_CASELESS);
enum {
SP0, _A0, _L0, _T0, _E0, _R, SP1, _T1, _A1, _B, _L1, _E1
} state = SP0;
for (std::string::const_iterator i = str.begin(); i != str.end(); ++i) {
if (state == SP0 && (*i == ' ' || *i == '\t' || *i == '\r' || *i == '\n')) {
} else if (state == SP0 && (*i == 'a' || *i == 'A')) {
state = _A0;
} else if (state == _A0 && (*i == 'l' || *i == 'L')) {
state = _L0;
} else if (state == _L0 && (*i == 't' || *i == 'T')) {
state = _T0;
} else if (state == _T0 && (*i == 'e' || *i == 'E')) {
state = _E0;
} else if (state == _E0 && (*i == 'r' || *i == 'R')) {
state = _R;
} else if (state == _R && (*i == ' ' || *i == '\t' || *i == '\r' || *i == '\n')) {
state = SP1;
} else if (state == SP1 && (*i == ' ' || *i == '\t' || *i == '\r' || *i == '\n')) {
} else if (state == SP1 && (*i == 't' || *i == 'T')) {
state = _T1;
} else if (state == _T1 && (*i == 'a' || *i == 'A')) {
state = _A1;
} else if (state == _A1 && (*i == 'b' || *i == 'B')) {
state = _B;
} else if (state == _B && (*i == 'l' || *i == 'L')) {
state = _L1;
} else if (state == _L1 && (*i == 'e' || *i == 'E')) {
state = _E1;
} else if (state == _E1) {
return true;
} else {
return false;
}
}
return false;
}
bool checkCreateQuery(const std::string& str)
{
if (0 == ::strncasecmp("create table ", str.c_str(), 13))
return true;
return false;
}
bool checkDropTableQuery(const std::string& str)
{
if (0 == ::strncasecmp("drop table ", str.c_str(), 11))
{
return true;
}
return false;
}
}
int Slave::process_event(const slave::Basic_event_info& bei, RelayLogInfo &m_rli, unsigned long long pos)
{
if (bei.when < 0 &&
bei.type != FORMAT_DESCRIPTION_EVENT)
return 0;
switch (bei.type) {
case QUERY_EVENT:
{
// Check for an ALTER TABLE
slave::Query_event_info qei(bei.buf, bei.event_len);
LOG_TRACE(log, "Received QUERY_EVENT: " << qei.query);
if (checkAlterQuery(qei.query) || checkCreateQuery(qei.query) || checkDropTableQuery(qei.query)) {
LOG_DEBUG(log, "Rebuilding database structure.");
createDatabaseStructure();
}
break;
}
case TABLE_MAP_EVENT:
{
LOG_TRACE(log, "Got TABLE_MAP_EVENT.");
slave::Table_map_event_info tmi(bei.buf, bei.event_len);
m_rli.setTableName(tmi.m_table_id, tmi.m_tblnam, tmi.m_dbnam);
break;
}
case WRITE_ROWS_EVENT:
case UPDATE_ROWS_EVENT:
case DELETE_ROWS_EVENT:
{
LOG_TRACE(log, "Got " << (bei.type == WRITE_ROWS_EVENT ? "WRITE" :
bei.type == DELETE_ROWS_EVENT ? "DELETE" :
"UPDATE") << "_ROWS_EVENT");
Row_event_info roi(bei.buf, bei.event_len, (bei.type == UPDATE_ROWS_EVENT));
apply_row_event(m_rli, bei, roi, ext_state);
break;
}
default:
break;
}
return 0;
}
void Slave::request_dump(const std::string& logname, unsigned long start_position, MYSQL* mysql) {
uchar buf[128];
/*
COM_BINLOG_DUMP accepts only 4 bytes for the position, so we are forced to
cast to uint32.
*/
//
//start_position = 4;
int binlog_flags = 0;
int4store(buf, (uint32)start_position);
int2store(buf + BIN_LOG_HEADER_SIZE, binlog_flags);
uint logname_len = logname.size();
int4store(buf + 6, m_server_id);
memcpy(buf + 10, logname.data(), logname_len);
if (simple_command(mysql, COM_BINLOG_DUMP, buf, logname_len + 10, 1)) {
LOG_ERROR(log, "Error sending COM_BINLOG_DUMP");
throw std::runtime_error("Error in sending COM_BINLOG_DUMP");
}
}
ulong Slave::read_event(MYSQL* mysql)
{
ulong len;
ext_state.setStateProcessing(false);
len = cli_safe_read(mysql);
if (len == packet_error) {
LOG_ERROR(log, "Myslave:Error reading packet from server: " << mysql_error(mysql)
<< "; mysql_error: " << mysql_errno(mysql));
return packet_error;
}
// check for end-of-data
if (len < 8 && mysql->net.read_pos[0] == 254) {
LOG_ERROR(log, "read_event(): end of data\n");
return packet_end_data;
}
return len;
}
void Slave::generateSlaveId()
{
std::set<unsigned int> server_ids;
nanomysql::Connection conn(m_master_info.host.c_str(), m_master_info.user.c_str(),
m_master_info.password.c_str(), "", m_master_info.port);
nanomysql::Connection::result_t res;
conn.query("SHOW SLAVE HOSTS");
conn.store(res);
for (nanomysql::Connection::result_t::const_iterator i = res.begin(); i != res.end(); ++i) {
//row[0] - server_id
std::map<std::string,nanomysql::field>::const_iterator z = i->find("Server_id");
if (z == i->end())
throw std::runtime_error("Slave::create_table(): SHOW SLAVE HOSTS query did not return 'Server_id'");
server_ids.insert(::strtoul(z->second.data.c_str(), NULL, 10));
}
unsigned int serveroid = ::time(NULL);
serveroid ^= (::getpid() << 16);
while (1) {
if (serveroid < 0) serveroid = -serveroid;
if (server_ids.count(serveroid) != 0) {
serveroid++;
} else {
break;
}
}
m_server_id = serveroid;
LOG_DEBUG(log, "Generated m_server_id = " << m_server_id);
}
std::pair<std::string,unsigned int> Slave::getLastBinlog()
{
nanomysql::Connection conn(m_master_info.host.c_str(), m_master_info.user.c_str(),
m_master_info.password.c_str(), "", m_master_info.port);
nanomysql::Connection::result_t res;
conn.query("SHOW MASTER STATUS");
conn.store(res);
if (res.size() == 1 && res[0].size() == 4) {
std::map<std::string,nanomysql::field>::const_iterator z = res[0].find("File");
if (z == res[0].end())
throw std::runtime_error("Slave::create_table(): SHOW SLAVE HOSTS query did not return 'File'");
std::string file = z->second.data;
z = res[0].find("Position");
if (z == res[0].end())
throw std::runtime_error("Slave::create_table(): SHOW SLAVE HOSTS query did not return 'Position'");
std::string pos = z->second.data;
return std::make_pair(file, ::strtoul(pos.c_str(), NULL, 10));
}
throw std::runtime_error("Slave::getLastBinLog(): Could not SHOW MASTER STATUS");
}