mvcc: support structured logging in compact restore

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

mvcc/kvstore.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"encoding/binary"
 	"errors"
+	"fmt"
 	"hash/crc32"
 	"math"
 	"sync"
@@ -330,7 +331,17 @@ func (s *store) restore() error {
 	_, finishedCompactBytes := tx.UnsafeRange(metaBucketName, finishedCompactKeyName, nil, 0)
 	if len(finishedCompactBytes) != 0 {
 		s.compactMainRev = bytesToRev(finishedCompactBytes[0]).main
-		plog.Printf("restore compact to %d", s.compactMainRev)
+
+		if s.lg != nil {
+			s.lg.Info(
+				"restored last compact revision",
+				zap.String("meta-bucket-name", string(metaBucketName)),
+				zap.String("meta-bucket-name-key", string(finishedCompactKeyName)),
+				zap.Int64("restored-compact-revision", s.compactMainRev),
+			)
+		} else {
+			plog.Printf("restore compact to %d", s.compactMainRev)
+		}
 	}
 	_, scheduledCompactBytes := tx.UnsafeRange(metaBucketName, scheduledCompactKeyName, nil, 0)
 	scheduledCompact := int64(0)
@@ -377,15 +388,33 @@ func (s *store) restore() error {
 		}
 		err := s.le.Attach(lid, []lease.LeaseItem{{Key: key}})
 		if err != nil {
-			plog.Errorf("unexpected Attach error: %v", err)
+			if s.lg != nil {
+				s.lg.Warn(
+					"failed to attach a lease",
+					zap.String("lease-id", fmt.Sprintf("%016x", lid)),
+					zap.Error(err),
+				)
+			} else {
+				plog.Errorf("unexpected Attach error: %v", err)
+			}
 		}
 	}
 
 	tx.Unlock()
 
 	if scheduledCompact != 0 {
 		s.Compact(scheduledCompact)
-		plog.Printf("resume scheduled compaction at %d", scheduledCompact)
+
+		if s.lg != nil {
+			s.lg.Info(
+				"resume scheduled compaction",
+				zap.String("meta-bucket-name", string(metaBucketName)),
+				zap.String("meta-bucket-name-key", string(scheduledCompactKeyName)),
+				zap.Int64("scheduled-compact-revision", scheduledCompact),
+			)
+		} else {
+			plog.Printf("resume scheduled compaction at %d", scheduledCompact)
+		}
 	}
 
 	return nil