Notifications (#34)

Notifications working for:

* Mentions
* Faves
* New follow requests
* New followers

internal/federation/federatingdb/db.go

@@ -0,0 +1,59 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 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 federatingdb
+
+import (
+	"context"
+	"sync"
+
+	"github.com/go-fed/activity/pub"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/typeutils"
+)
+
+// DB wraps the pub.Database interface with a couple of custom functions for GoToSocial.
+type DB interface {
+	pub.Database
+	Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error
+	Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error
+}
+
+// FederatingDB uses the underlying DB interface to implement the go-fed pub.Database interface.
+// It doesn't care what the underlying implementation of the DB interface is, as long as it works.
+type federatingDB struct {
+	locks         *sync.Map
+	db            db.DB
+	config        *config.Config
+	log           *logrus.Logger
+	typeConverter typeutils.TypeConverter
+}
+
+// New returns a DB interface using the given database, config, and logger.
+func New(db db.DB, config *config.Config, log *logrus.Logger) DB {
+	return &federatingDB{
+		locks:         new(sync.Map),
+		db:            db,
+		config:        config,
+		log:           log,
+		typeConverter: typeutils.NewConverter(config, db),
+	}
+}