Move a lot of stuff + tidy stuff (#37)

Lots of renaming and moving stuff, some bug fixes, more lenient parsing of notifications and home timeline.

internal/processing/instance.go

@@ -0,0 +1,41 @@
+/*
+   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 processing
+
+import (
+	"fmt"
+
+	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (p *processor) InstanceGet(domain string) (*apimodel.Instance, ErrorWithCode) {
+	i := &gtsmodel.Instance{}
+	if err := p.db.GetWhere([]db.Where{{Key: "domain", Value: domain}}, i); err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("db error fetching instance %s: %s", p.config.Host, err))
+	}
+
+	ai, err := p.tc.InstanceToMasto(i)
+	if err != nil {
+		return nil, NewErrorInternalError(fmt.Errorf("error converting instance to api representation: %s", err))
+	}
+
+	return ai, nil
+}