[chore] move caches to a separate State{} structure (#1078)

* move caches to a separate State{} structure

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

* fix call to log.Panic not using formatted call

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

* move caches to use interfaces, to make switchouts easier in future

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

* fix rebase issue

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

* improve code comment

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

* fix further issues after rebase

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

* heh

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

* add missing license text

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

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

1 files changed, 36 insertions, 0 deletions

diff --git a/internal/cache/util.go b/internal/cache/util.go
new file mode 100644
index 000000000..56be27e05
--- /dev/null
+++ b/internal/cache/util.go
@@ -0,0 +1,36 @@
+/*
+   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 cache
+
+import "github.com/superseriousbusiness/gotosocial/internal/log"
+
+// nocopy when embedded will signal linter to
+// error on pass-by-value of parent struct.
+type nocopy struct{}
+
+func (*nocopy) Lock() {}
+
+func (*nocopy) Unlock() {}
+
+// tryUntil will attempt to call 'do' for 'count' attempts, before panicking with 'msg'.
+func tryUntil(msg string, count int, do func() bool) {
+	for i := 0; i < count && !do(); i++ {
+	}
+	log.Panicf("failed %s after %d tries", msg, count)
+}