Add support for on_ddl flag

Signed-off-by: Jacques Grove <aquarapid@gmail.com>

vreplgen/vreplgen.go

@@ -23,6 +23,7 @@ package main
 
 import (
 	"bytes"
+	"flag"
 	"fmt"
 	"os"
 	"strings"
@@ -31,24 +32,35 @@ import (
 	binlogdatapb "vitess.io/vitess/go/vt/proto/binlogdata"
 )
 
+var onDdl string
+
+func init() {
+	flag.StringVar(&onDdl, "on_ddl", "ignore", "Set on_ddl value for replication stream - ignore, stop, exec, exec_ignore")
+	flag.Parse()
+}
+
 func main() {
+	argOffset := 0
+	if (len(os.Args) > 1 && strings.HasPrefix(os.Args[1], "-")) {
+		argOffset = 2
+	}
+
+	if (len(os.Args) < (7+argOffset)) {
+		fmt.Println("Usage: /vreplgen [-on_ddl (ignore|stop|exec|exec_ignore)] <tablet_id> <src_keyspace> <src_shard> <dest_keyspace> <dest_table1> 'filter1' [<dest_table2> 'filter2']...")
+		os.Exit(1)
+	}
+
 	vtctl := os.Getenv("VTCTLCLIENT")
 	if (vtctl == "") {
 	  vtctl = "vtctlclient -server localhost:15999"
 	}
-	// TODO: DDL ignore or not
-	if (len(os.Args) < 7) {
-		fmt.Println("Usage: /vreplgen <tablet_id> <src_keyspace> <src_shard> <dest_keyspace> <dest_table1> 'filter1' [<dest_table2> 'filter2']...")
-		os.Exit(1)
-	}
-	tabletID := os.Args[1]
-	sourceKeyspace := os.Args[2]
-	sourceShard := os.Args[3]
-	destKeyspace := os.Args[4]
+	tabletID := os.Args[1+argOffset]
+	sourceKeyspace := os.Args[2+argOffset]
+	sourceShard := os.Args[3+argOffset]
+	destKeyspace := os.Args[4+argOffset]
 	destDbName := "vt_" + destKeyspace
-	listSize := (len(os.Args) - 5)/2
-	rules := make([]*binlogdatapb.Rule, listSize)
-	for i := 5; i < len(os.Args); i = i+2 {
+	var rules []*binlogdatapb.Rule
+	for i := 5+argOffset; i < len(os.Args); i = i+2 {
 		destTable := os.Args[i]
 		destFilter := os.Args[i+1]
 		rule := new(binlogdatapb.Rule)
@@ -59,11 +71,24 @@ func main() {
 	filter := &binlogdatapb.Filter{
 		Rules: rules,
 	}
+
+	var onDdlAction binlogdatapb.OnDDLAction
+	switch onDdl {
+	case "ignore":
+		onDdlAction = binlogdatapb.OnDDLAction_IGNORE
+	case "stop":
+		onDdlAction = binlogdatapb.OnDDLAction_STOP
+	case "exec":
+		onDdlAction = binlogdatapb.OnDDLAction_EXEC
+	case "exec_ignore":
+		onDdlAction = binlogdatapb.OnDDLAction_EXEC_IGNORE
+	}
+
 	bls := &binlogdatapb.BinlogSource{
 		Keyspace: sourceKeyspace,
 		Shard:    sourceShard,
 		Filter:   filter,
-		OnDdl:    binlogdatapb.OnDDLAction_IGNORE,
+		OnDdl:    onDdlAction,
 	}
 	val := sqltypes.NewVarBinary(fmt.Sprintf("%v", bls))
 	var sqlEscaped bytes.Buffer