fix: added Debugf

Author: trakhimenok

memcache4dalgo/get.go

@@ -12,6 +12,9 @@ func getRecord(ctx context.Context, record dal.Record, get func(ctx context.Cont
 	var item *memcache.Item
 	if item, err = memcache.Get(ctx, key); err == nil {
 		if err = json.Unmarshal(item.Value, record.Data()); err == nil {
+			if Debugf != nil {
+				Debugf(ctx, "memcache4dalgo.getRecord: hit %s", key)
+			}
 			return
 		}
 	}

memcache4dalgo/get_multi.go

@@ -19,6 +19,9 @@ func getMultiRecords(ctx context.Context, records []dal.Record, getMulti func(co
 		for key, item := range items {
 			if err = json.Unmarshal(item.Value, recordsByKey[key].Data()); err == nil {
 				delete(recordsByKey, key)
+				if Debugf != nil {
+					Debugf(ctx, "memcache4dalgo.getMultiRecords: hit %s", key)
+				}
 			}
 		}
 	}

memcache4dalgo/logging.go

@@ -0,0 +1,5 @@
+package memcache4dalgo
+
+import "context"
+
+var Debugf func(ctx context.Context, format string, args ...interface{}) = nil

memcache4dalgo/transaction.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"github.com/dal-go/dalgo/dal"
 	"google.golang.org/appengine/memcache"
+	"strings"
 )
 
 type transaction struct {
@@ -69,6 +70,9 @@ func (t transaction) UpdateMulti(ctx context.Context, keys []*dal.Key, updates [
 func deleteCached(ctx context.Context, key *dal.Key) {
 	mk := key.String()
 	_ = memcache.Delete(ctx, mk)
+	if Debugf != nil {
+		Debugf(ctx, "memcache4dalgo.deleteCached: %s", mk)
+	}
 }
 
 func deleteCachedByKeys(ctx context.Context, keys []*dal.Key) {
@@ -77,6 +81,9 @@ func deleteCachedByKeys(ctx context.Context, keys []*dal.Key) {
 		mks[i] = k.String()
 	}
 	_ = memcache.DeleteMulti(ctx, mks)
+	if Debugf != nil {
+		Debugf(ctx, "memcache4dalgo.deleteCachedByKeys: %v", strings.Join(mks, ", "))
+	}
 }
 
 func deleteCached4records(ctx context.Context, records []dal.Record) {