Add a 'free' version to track deletion of tiered object content (#12470)

cmd/tier-mem-journal.go

@@ -0,0 +1,56 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/minio/minio/internal/logger"
+)
+
+type tierMemJournal struct {
+	entries chan jentry
+}
+
+func newTierMemJoural(nevents int) *tierMemJournal {
+	return &tierMemJournal{
+		entries: make(chan jentry, nevents),
+	}
+}
+
+func (j *tierMemJournal) processEntries(ctx context.Context) {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case entry := <-j.entries:
+			logger.LogIf(ctx, deleteObjectFromRemoteTier(ctx, entry.ObjName, entry.VersionID, entry.TierName))
+		}
+	}
+}
+
+func (j *tierMemJournal) AddEntry(je jentry) error {
+	select {
+	case j.entries <- je:
+	default:
+		return fmt.Errorf("failed to remove tiered content at %s with version %s from tier %s, will be retried later.",
+			je.ObjName, je.VersionID, je.TierName)
+	}
+	return nil
+}