// InitAgent initializes the agent within vttablet.
func InitAgent(
tabletAlias topo.TabletAlias,
dbcfgs dbconfigs.DBConfigs,
mycnf *mysqlctl.Mycnf,
dbConfigsFile, dbCredentialsFile string,
port, securePort int,
mycnfFile, overridesFile string) (err error) {
schemaOverrides := loadSchemaOverrides(overridesFile)
topoServer := topo.GetServer()
// Start the binlog server service, disabled at start.
binlogServer = mysqlctl.NewBinlogServer(mycnf)
mysqlctl.RegisterBinlogServerService(binlogServer)
// Start the binlog player services, not playing at start.
binlogPlayerMap = NewBinlogPlayerMap(topoServer, &dbcfgs.Dba)
RegisterBinlogPlayerMap(binlogPlayerMap)
// Compute the bind addresses
bindAddr := fmt.Sprintf(":%v", port)
secureAddr := ""
if securePort != 0 {
secureAddr = fmt.Sprintf(":%v", securePort)
}
exportedType := expvar.NewString("tablet-type")
// Action agent listens to changes in zookeeper and makes
// modifications to this tablet.
agent, err = tm.NewActionAgent(topoServer, tabletAlias, mycnfFile, dbConfigsFile, dbCredentialsFile)
if err != nil {
return err
}
agent.AddChangeCallback(func(oldTablet, newTablet topo.Tablet) {
if newTablet.IsServingType() {
if dbcfgs.App.Dbname == "" {
dbcfgs.App.Dbname = newTablet.DbName()
}
dbcfgs.App.KeyRange = newTablet.KeyRange
dbcfgs.App.Keyspace = newTablet.Keyspace
dbcfgs.App.Shard = newTablet.Shard
// Transitioning from replica to master, first disconnect
// existing connections. "false" indicateds that clients must
// re-resolve their endpoint before reconnecting.
if newTablet.Type == topo.TYPE_MASTER && oldTablet.Type != topo.TYPE_MASTER {
ts.DisallowQueries(false)
}
qrs := ts.LoadCustomRules()
if dbcfgs.App.KeyRange.IsPartial() {
qr := ts.NewQueryRule("enforce keyspace_id range", "keyspace_id_not_in_range", ts.QR_FAIL_QUERY)
qr.AddPlanCond(sqlparser.PLAN_INSERT_PK)
err = qr.AddBindVarCond("keyspace_id", true, true, ts.QR_NOTIN, dbcfgs.App.KeyRange)
if err != nil {
log.Warningf("Unable to add keyspace rule: %v", err)
} else {
qrs.Add(qr)
}
}
ts.AllowQueries(dbcfgs.App, schemaOverrides, qrs)
mysqlctl.EnableUpdateStreamService(string(newTablet.Type), dbcfgs)
if newTablet.Type != topo.TYPE_MASTER {
ts.StartRowCacheInvalidation()
}
} else {
ts.DisallowQueries(false)
ts.StopRowCacheInvalidation()
mysqlctl.DisableUpdateStreamService()
}
exportedType.Set(string(newTablet.Type))
// BinlogServer is only enabled for replicas
if newTablet.Type == topo.TYPE_REPLICA {
if !mysqlctl.IsBinlogServerEnabled(binlogServer) {
mysqlctl.EnableBinlogServerService(binlogServer, dbcfgs.App.Dbname)
}
} else {
if mysqlctl.IsBinlogServerEnabled(binlogServer) {
mysqlctl.DisableBinlogServerService(binlogServer)
}
}
// See if we need to start or stop any binlog player
if newTablet.Type == topo.TYPE_MASTER {
binlogPlayerMap.RefreshMap(newTablet)
} else {
binlogPlayerMap.StopAllPlayers()
}
})
mysqld := mysqlctl.NewMysqld(mycnf, dbcfgs.Dba, dbcfgs.Repl)
if err := agent.Start(bindAddr, secureAddr, mysqld.Addr()); err != nil {
return err
}
// register the RPC services from the agent
agent.RegisterQueryService(mysqld)
return nil
}
func initAgent(tabletAlias topo.TabletAlias, dbcfgs dbconfigs.DBConfigs, mycnf *mysqlctl.Mycnf, dbConfigsFile, dbCredentialsFile string) error {
topoServer := topo.GetServer()
umgmt.AddCloseCallback(func() {
topo.CloseServers()
})
bindAddr := fmt.Sprintf(":%v", *port)
secureAddr := ""
if *securePort != 0 {
secureAddr = fmt.Sprintf(":%v", *securePort)
}
// Action agent listens to changes in zookeeper and makes
// modifications to this tablet.
agent, err := tm.NewActionAgent(topoServer, tabletAlias, *mycnfFile, dbConfigsFile, dbCredentialsFile)
if err != nil {
return err
}
agent.AddChangeCallback(func(oldTablet, newTablet topo.Tablet) {
if newTablet.IsServingType() {
if dbcfgs.App.Dbname == "" {
dbcfgs.App.Dbname = newTablet.DbName()
}
dbcfgs.App.KeyRange = newTablet.KeyRange
dbcfgs.App.Keyspace = newTablet.Keyspace
dbcfgs.App.Shard = newTablet.Shard
// Transitioning from replica to master, first disconnect
// existing connections. "false" indicateds that clients must
// re-resolve their endpoint before reconnecting.
if newTablet.Type == topo.TYPE_MASTER && oldTablet.Type != topo.TYPE_MASTER {
ts.DisallowQueries(false)
}
qrs := loadCustomRules()
if dbcfgs.App.KeyRange.IsPartial() {
qr := ts.NewQueryRule("enforce keyspace_id range", "keyspace_id_not_in_range", ts.QR_FAIL_QUERY)
qr.AddPlanCond(sqlparser.PLAN_INSERT_PK)
err = qr.AddBindVarCond("keyspace_id", true, true, ts.QR_NOTIN, dbcfgs.App.KeyRange)
if err != nil {
relog.Warning("Unable to add keyspace rule: %v", err)
} else {
qrs.Add(qr)
}
}
ts.AllowQueries(dbcfgs.App, schemaOverrides, qrs)
mysqlctl.EnableUpdateStreamService(string(newTablet.Type), dbcfgs)
if newTablet.Type != topo.TYPE_MASTER {
ts.StartRowCacheInvalidation()
}
} else {
ts.DisallowQueries(false)
mysqlctl.DisableUpdateStreamService()
if newTablet.Type != topo.TYPE_MASTER {
ts.StopRowCacheInvalidation()
}
}
})
mysqld := mysqlctl.NewMysqld(mycnf, dbcfgs.Dba, dbcfgs.Repl)
if err := agent.Start(bindAddr, secureAddr, mysqld.Addr()); err != nil {
return err
}
umgmt.AddCloseCallback(func() {
agent.Stop()
})
// register the RPC services from the agent
agent.RegisterQueryService(mysqld)
return nil
}