[chore] Move initial MediaRemotePrune to cmd.server function (#536)

* move initial prune up to the server start function

* don't do initial prune when starting media manager

* add admin/mediaremoteprune in processor

internal/processing/admin/admin.go

@@ -41,6 +41,7 @@ type Processor interface {
 	DomainBlockDelete(ctx context.Context, account *gtsmodel.Account, id string) (*apimodel.DomainBlock, gtserror.WithCode)
 	AccountAction(ctx context.Context, account *gtsmodel.Account, form *apimodel.AdminAccountActionRequest) gtserror.WithCode
 	EmojiCreate(ctx context.Context, account *gtsmodel.Account, user *gtsmodel.User, form *apimodel.EmojiCreateRequest) (*apimodel.Emoji, gtserror.WithCode)
+	MediaRemotePrune(ctx context.Context, mediaRemoteCacheDays int) gtserror.WithCode
 }
 
 type processor struct {

internal/processing/admin/mediaremoteprune.go

@@ -0,0 +1,45 @@
+/*
+   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 admin
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) MediaRemotePrune(ctx context.Context, mediaRemoteCacheDays int) gtserror.WithCode {
+	if mediaRemoteCacheDays < 0 {
+		err := fmt.Errorf("invalid value for mediaRemoteCacheDays prune: value was %d, cannot be less than 0", mediaRemoteCacheDays)
+		return gtserror.NewErrorBadRequest(err, err.Error())
+	}
+
+	go func() {
+		pruned, err := p.mediaManager.PruneRemote(ctx, mediaRemoteCacheDays)
+		if err != nil {
+			logrus.Errorf("MediaRemotePrune: error pruning: %s", err)
+		} else {
+			logrus.Infof("MediaRemotePrune: pruned %d entries", pruned)
+		}
+	}()
+
+	return nil
+}