[feature] Read + Write tombstones for deleted Actors (#1005)

* [feature] Read + Write tombstones for deleted Actors

* copyTombstone

* update to use resultcache instead of old ttl cache

Signed-off-by: kim <grufwub@gmail.com>

* update go-cache library to fix result cache capacity / ordering bugs

Signed-off-by: kim <grufwub@gmail.com>

* bump go-cache/v3 to v3.1.6 to fix bugs

Signed-off-by: kim <grufwub@gmail.com>

* switch on status code

* better explain ErrGone reasoning

Signed-off-by: kim <grufwub@gmail.com>
Co-authored-by: kim <grufwub@gmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/internal/db/tombstone.go b/internal/db/tombstone.go
new file mode 100644
index 000000000..e99632cb7
--- /dev/null
+++ b/internal/db/tombstone.go
@@ -0,0 +1,40 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   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 db
+
+import (
+	"context"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+// Tombstone contains functionality for storing + retrieving tombstones for remote AP Activities + Objects.
+type Tombstone interface {
+	// GetTombstoneByURI attempts to fetch a tombstone by the given URI.
+	GetTombstoneByURI(ctx context.Context, uri string) (*gtsmodel.Tombstone, Error)
+
+	// TombstoneExistsWithURI returns true if a tombstone with the given URI exists.
+	TombstoneExistsWithURI(ctx context.Context, uri string) (bool, Error)
+
+	// PutTombstone creates a new tombstone in the database.
+	PutTombstone(ctx context.Context, tombstone *gtsmodel.Tombstone) Error
+
+	// DeleteTombstone deletes a tombstone with the given ID.
+	DeleteTombstone(ctx context.Context, id string) Error
+}