[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, 38 insertions, 0 deletions

diff --git a/internal/gtsmodel/tombstone.go b/internal/gtsmodel/tombstone.go
new file mode 100644
index 000000000..62a8d2601
--- /dev/null
+++ b/internal/gtsmodel/tombstone.go
@@ -0,0 +1,38 @@
+/*
+   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 gtsmodel contains types used *internally* by GoToSocial and added/removed/selected from the database.
+// These types should never be serialized and/or sent out via public APIs, as they contain sensitive information.
+// The annotation used on these structs is for handling them via the bun-db ORM.
+// See here for more info on bun model annotations: https://bun.uptrace.dev/guide/models.html
+package gtsmodel
+
+import (
+	"time"
+)
+
+// Tombstone represents either a remote fediverse account, object, activity etc which has been deleted.
+// It's useful in cases where a remote account has been deleted, and we don't want to keep trying to process
+// subsequent activities from that account, or deletes which target it.
+type Tombstone struct {
+	ID        string    `validate:"required,ulid" bun:"type:CHAR(26),pk,nullzero,notnull,unique"`        // id of this item in the database
+	CreatedAt time.Time `validate:"-" bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // when was item created
+	UpdatedAt time.Time `validate:"-" bun:"type:timestamptz,nullzero,notnull,default:current_timestamp"` // when was item last updated
+	Domain    string    `validate:"omitempty,fqdn" bun:",nullzero,notnull"`                              // Domain of the Object/Actor.
+	URI       string    `validate:"required,url" bun:",nullzero,notnull,unique"`                         // ActivityPub URI for this Object/Actor.
+}