Database updates (#144)

* start moving some database stuff around

* continue moving db stuff around

* more fiddling

* more updates

* and some more

* and yet more

* i broke SOMETHING but what, it's a mystery

* tidy up

* vendor ttlcache

* use ttlcache

* fix up some tests

* rename some stuff

* little reminder

* some more updates

1 files changed, 36 insertions, 0 deletions

diff --git a/internal/db/instance.go b/internal/db/instance.go
new file mode 100644
index 000000000..1f7c83e4f
--- /dev/null
+++ b/internal/db/instance.go
@@ -0,0 +1,36 @@
+/*
+   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 db
+
+import "github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+
+// Instance contains functions for instance-level actions (counting instance users etc.).
+type Instance interface {
+	// CountInstanceUsers returns the number of known accounts registered with the given domain.
+	CountInstanceUsers(domain string) (int, Error)
+
+	// CountInstanceStatuses returns the number of known statuses posted from the given domain.
+	CountInstanceStatuses(domain string) (int, Error)
+
+	// CountInstanceDomains returns the number of known instances known that the given domain federates with.
+	CountInstanceDomains(domain string) (int, Error)
+
+	// GetInstanceAccounts returns a slice of accounts from the given instance, arranged by ID.
+	GetInstanceAccounts(domain string, maxID string, limit int) ([]*gtsmodel.Account, Error)
+}