[PBM-1187] add --wait option to pbm config --force-resync (#883)

Author: defbin

cmd/pbm/config.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"reflect"
 	"strings"
+	"time"
 
 	"go.mongodb.org/mongo-driver/mongo"
 	"gopkg.in/yaml.v2"
@@ -17,8 +18,11 @@ import (
 	"github.com/percona/percona-backup-mongodb/sdk"
 )
 
+const resyncWaitDuration = 30 * time.Second
+
 type configOpts struct {
 	rsync bool
+	wait  bool
 	list  bool
 	file  string
 	set   map[string]string
@@ -75,11 +79,27 @@ func runConfig(ctx context.Context, conn connect.Client, pbmSDK sdk.Client, c *c
 		}
 		return confKV{c.key, fmt.Sprint(k)}, nil
 	case c.rsync:
-
-		if _, err := pbmSDK.SyncFromStorage(ctx); err != nil {
+		cid, err := pbmSDK.SyncFromStorage(ctx)
+		if err != nil {
 			return nil, errors.Wrap(err, "resync")
 		}
-		return outMsg{"Storage resync started"}, nil
+
+		if !c.wait {
+			return outMsg{"Storage resync started"}, nil
+		}
+
+		ctx, cancel := context.WithTimeout(ctx, resyncWaitDuration)
+		defer cancel()
+
+		err = sdk.WaitForResync(ctx, pbmSDK, cid)
+		if err != nil {
+			if errors.Is(err, context.DeadlineExceeded) {
+				err = errors.New("timeout")
+			}
+			return nil, errors.Wrapf(err, "waiting for resync [opid %q]", cid)
+		}
+
+		return outMsg{"Storage resync finished"}, nil
 	case len(c.file) > 0:
 		var buf []byte
 		var err error

cmd/pbm/main.go

@@ -96,6 +96,9 @@ func main() {
 		StringMapVar(&cfg.set)
 	configCmd.Arg("key", "Show the value of a specified key").
 		StringVar(&cfg.key)
+	configCmd.Flag("wait", "Wait for finish").
+		Short('w').
+		BoolVar(&cfg.wait)
 
 	backupCmd := pbmCmd.Command("backup", "Make backup")
 	backup := backupOpts{}

internal/log/history.go

@@ -214,6 +214,10 @@ func Follow(
 			e.ObjID, _ = cur.Current.Lookup("_id").ObjectIDOK()
 			outC <- e
 		}
+
+		if err := cur.Err(); err != nil {
+			errC <- err
+		}
 	}()
 
 	return outC, errC

sdk/util.go

@@ -2,12 +2,14 @@ package sdk
 
 import (
 	"context"
-	"errors"
 
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo"
 
+	"github.com/percona/percona-backup-mongodb/internal/ctrl"
 	"github.com/percona/percona-backup-mongodb/internal/defs"
+	"github.com/percona/percona-backup-mongodb/internal/errors"
+	"github.com/percona/percona-backup-mongodb/internal/log"
 	"github.com/percona/percona-backup-mongodb/internal/topo"
 )
 
@@ -28,3 +30,29 @@ func GetClusterTime(ctx context.Context, m *mongo.Client) (Timestamp, error) {
 
 	return info.ClusterTime.ClusterTime, nil
 }
+
+func WaitForResync(ctx context.Context, c Client, cid CommandID) error {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	r := &log.LogRequest{
+		LogKeys: log.LogKeys{
+			Event:    string(ctrl.CmdResync),
+			OPID:     string(cid),
+			Severity: log.Info,
+		},
+	}
+
+	outC, errC := log.Follow(ctx, c.(*clientImpl).conn.LogCollection(), r, false)
+
+	for {
+		select {
+		case entry := <-outC:
+			if entry != nil && entry.Msg == "succeed" {
+				return nil
+			}
+		case err := <-errC:
+			return err
+		}
+	}
+}