Add ChangeTabletTags/ChangeTags RPCs

Signed-off-by: Tim Vaillancourt <[email protected]>

go/cmd/vtctldclient/cli/tablets.go

@@ -17,9 +17,11 @@ limitations under the License.
 package cli
 
 import (
-	"vitess.io/vitess/go/vt/topo/topoproto"
+	"fmt"
+	"strings"
 
 	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
+	"vitess.io/vitess/go/vt/topo/topoproto"
 )
 
 // TabletAliasesFromPosArgs takes a list of positional (non-flag) arguments and
@@ -38,3 +40,22 @@ func TabletAliasesFromPosArgs(args []string) ([]*topodatapb.TabletAlias, error)
 
 	return aliases, nil
 }
+
+// TabletTagsFromPosArgs takes a list of positional (non-flag) arguements and
+// converts them to a map of tablet tags.
+func TabletTagsFromPosArgs(args []string) (map[string]string, error) {
+	if len(args) == 0 {
+		return nil, fmt.Errorf("no tablet tags specified")
+	}
+
+	tags := make(map[string]string, len(args))
+	for _, kvPair := range args {
+		if !strings.Contains(kvPair, "=") {
+			return nil, fmt.Errorf("invalid tablet tag %q specified. tablet tags must be specified in key=value format", kvPair)
+		}
+		fields := strings.SplitN(kvPair, ":", 2)
+		tags[fields[0]] = fields[1]
+	}
+
+	return tags, nil
+}

go/cmd/vtctldclient/command/tablets.go

@@ -34,6 +34,17 @@ import (
 )
 
 var (
+	// ChangeTabletTags makes a ChangeTabletTags gRPC call to a vtctld.
+	ChangeTabletTags = &cobra.Command{
+		Use:   "ChangeTabletTags <alias> <tablet-tag> [ <tablet-tag> ... ]",
+		Short: "Changes the tablet tags for the specified tablet, if possible.",
+		Long: `Changes the tablet tags for the specified tablet, if possible.
+
+Tags must be specified as key=value pairs.`,
+		DisableFlagsInUseLine: true,
+		Args:                  cobra.MinimumNArgs(2),
+		RunE:                  commandChangeTabletTags,
+	}
 	// ChangeTabletType makes a ChangeTabletType gRPC call to a vtctld.
 	ChangeTabletType = &cobra.Command{
 		Use:   "ChangeTabletType [--dry-run] <alias> <tablet-type>",
@@ -212,6 +223,40 @@ Note that, in the SleepTablet implementation, the value should be positively-sig
 	}
 )
 
+var changeTabletTagsOptions = struct {
+	Replace bool
+}{}
+
+func commandChangeTabletTags(cmd *cobra.Command, args []string) error {
+	allArgs := cmd.Flags().Args()
+
+	alias, err := topoproto.ParseTabletAlias(allArgs[0])
+	if err != nil {
+		return err
+	}
+
+	tags, err := cli.TabletTagsFromPosArgs(allArgs[1:])
+	if err != nil {
+		return err
+	}
+
+	cli.FinishedParsing(cmd)
+
+	resp, err := client.ChangeTabletTags(commandCtx, &vtctldatapb.ChangeTabletTagsRequest{
+		TabletAlias: alias,
+		Tags:        tags,
+		Replace:     changeTabletTagsOptions.Replace,
+	})
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("- %v\n", resp.BeforeTags)
+	fmt.Printf("+ %v\n", resp.AfterTags)
+
+	return nil
+}
+
 var changeTabletTypeOptions = struct {
 	DryRun bool
 }{}
@@ -629,6 +674,9 @@ func commandStopReplication(cmd *cobra.Command, args []string) error {
 }
 
 func init() {
+	ChangeTabletTags.Flags().BoolVarP(&changeTabletTagsOptions.Replace, "replace", "r", false, "Replace all tablet tags with the tags provided. By default tags are merged/updated.")
+	Root.AddCommand(ChangeTabletTags)
+
 	ChangeTabletType.Flags().BoolVarP(&changeTabletTypeOptions.DryRun, "dry-run", "d", false, "Shows the proposed change without actually executing it.")
 	Root.AddCommand(ChangeTabletType)
 

go/flags/endtoend/vtctldclient.txt

@@ -18,6 +18,7 @@ Available Commands:
   ApplyVSchema                Applies the VTGate routing schema to the provided keyspace. Shows the result after application.
   Backup                      Uses the BackupStorage service on the given tablet to create and store a new backup.
   BackupShard                 Finds the most up-to-date REPLICA, RDONLY, or SPARE tablet in the given shard and uses the BackupStorage service on that tablet to create and store a new backup.
+  ChangeTabletTags            Changes the tablet tags for the specified tablet, if possible.
   ChangeTabletType            Changes the db type for the specified tablet, if possible.
   CheckThrottler              Issue a throttler check on the given tablet.
   CreateKeyspace              Creates the specified keyspace in the topology.