planner, executor: support SQL show pump/drainer status

executor/show.go

@@ -30,6 +30,10 @@ import (
 	"github.com/pingcap/parser/model"
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/parser/terror"
+	"github.com/pingcap/tidb-tools/pkg/etcd"
+	"github.com/pingcap/tidb-tools/pkg/utils"
+	"github.com/pingcap/tidb-tools/tidb-binlog/node"
+	"github.com/pingcap/tidb/config"
 	"github.com/pingcap/tidb/infoschema"
 	plannercore "github.com/pingcap/tidb/planner/core"
 	"github.com/pingcap/tidb/plugin"
@@ -44,6 +48,8 @@ import (
 	"github.com/pingcap/tidb/util/sqlexec"
 )
 
+var etcdDialTimeout = 5 * time.Second
+
 // ShowExec represents a show executor.
 type ShowExec struct {
 	baseExecutor
@@ -115,6 +121,8 @@ func (e *ShowExec) fetchAll() error {
 		return e.fetchShowCreateDatabase()
 	case ast.ShowDatabases:
 		return e.fetchShowDatabases()
+	case ast.ShowDrainerStatus:
+		return e.fetchShowPumpOrDrainerStatus(node.DrainerNode)
 	case ast.ShowEngines:
 		return e.fetchShowEngines()
 	case ast.ShowGrants:
@@ -123,6 +131,8 @@ func (e *ShowExec) fetchAll() error {
 		return e.fetchShowIndex()
 	case ast.ShowProcedureStatus:
 		return e.fetchShowProcedureStatus()
+	case ast.ShowPumpStatus:
+		return e.fetchShowPumpOrDrainerStatus(node.PumpNode)
 	case ast.ShowStatus:
 		return e.fetchShowStatus()
 	case ast.ShowTables:
@@ -996,6 +1006,43 @@ func (e *ShowExec) fetchShowWarnings(errOnly bool) error {
 	return nil
 }
 
+// fetchShowPumpOrDrainerStatus gets status of all pumps or drainers and fill them into e.rows.
+func (e *ShowExec) fetchShowPumpOrDrainerStatus(kind string) error {
+	registry, err := createRegistry(config.GetGlobalConfig().Path)
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	nodes, _, err := registry.Nodes(context.Background(), node.NodePrefix[kind])
+	if err != nil {
+		return errors.Trace(err)
+	}
+	err = registry.Close()
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	for _, n := range nodes {
+		e.appendRow([]interface{}{n.NodeID, n.Addr, n.State, n.MaxCommitTS, utils.TSOToRoughTime(n.UpdateTS).Format(types.TimeFormat)})
+	}
+
+	return nil
+}
+
+// createRegistry returns an ectd registry
+func createRegistry(urls string) (*node.EtcdRegistry, error) {
+	ectdEndpoints, err := utils.ParseHostPortAddr(urls)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+	cli, err := etcd.NewClientFromCfg(ectdEndpoints, etcdDialTimeout, node.DefaultRootPath, nil)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	return node.NewEtcdRegistry(cli, etcdDialTimeout), nil
+}
+
 func (e *ShowExec) getTable() (table.Table, error) {
 	if e.Table == nil {
 		return nil, errors.New("table not found")

planner/core/planbuilder.go

@@ -1750,6 +1750,9 @@ func buildShowSchema(s *ast.ShowStmt, isView bool) (schema *expression.Schema) {
 		names = []string{"View", "Create View", "character_set_client", "collation_connection"}
 	case ast.ShowCreateDatabase:
 		names = []string{"Database", "Create Database"}
+	case ast.ShowDrainerStatus:
+		names = []string{"NodeID", "Address", "State", "Max_Commit_Ts", "Update_Time"}
+		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeVarchar}
 	case ast.ShowGrants:
 		if s.User != nil {
 			names = []string{fmt.Sprintf("Grants for %s", s.User)}
@@ -1773,6 +1776,9 @@ func buildShowSchema(s *ast.ShowStmt, isView bool) (schema *expression.Schema) {
 		names = []string{"Id", "User", "Host", "db", "Command", "Time", "State", "Info"}
 		ftypes = []byte{mysql.TypeLonglong, mysql.TypeVarchar, mysql.TypeVarchar,
 			mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLong, mysql.TypeVarchar, mysql.TypeString}
+	case ast.ShowPumpStatus:
+		names = []string{"NodeID", "Address", "State", "Max_Commit_Ts", "Update_Time"}
+		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeLonglong, mysql.TypeVarchar}
 	case ast.ShowStatsMeta:
 		names = []string{"Db_name", "Table_name", "Partition_name", "Update_time", "Modify_count", "Row_count"}
 		ftypes = []byte{mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeVarchar, mysql.TypeDatetime, mysql.TypeLonglong, mysql.TypeLonglong}