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

4 files changed, 99 insertions, 0 deletions

diff --git a/internal/cache/cache.go b/internal/cache/cache.go
index 1d2d0533b..eb3744cfe 100644
--- a/internal/cache/cache.go
+++ b/internal/cache/cache.go
@@ -18,8 +18,28 @@
 
 package cache
 
+import (
+	"time"
+
+	"github.com/ReneKroon/ttlcache"
+)
+
 // Cache defines an in-memory cache that is safe to be wiped when the application is restarted
 type Cache interface {
 	Store(k string, v interface{}) error
 	Fetch(k string) (interface{}, error)
 }
+
+type cache struct {
+	c *ttlcache.Cache
+}
+
+// New returns a new in-memory cache.
+func New() Cache {
+	c := ttlcache.NewCache()
+	c.SetTTL(30 * time.Second)
+	cache := &cache{
+		c: c,
+	}
+	return cache
+}
diff --git a/internal/cache/error.go b/internal/cache/error.go
new file mode 100644
index 000000000..3f32aa7ce
--- /dev/null
+++ b/internal/cache/error.go
@@ -0,0 +1,27 @@
+/*
+   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 cache
+
+import "errors"
+
+// Error models an error returned by the in-memory cache.
+type Error error
+
+// ErrNotFound means that a value for the requested key was not found in the cache.
+var ErrNotFound = errors.New("value not found in cache")
diff --git a/internal/cache/fetch.go b/internal/cache/fetch.go
new file mode 100644
index 000000000..c107b9b26
--- /dev/null
+++ b/internal/cache/fetch.go
@@ -0,0 +1,28 @@
+/*
+   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 cache
+
+func (c *cache) Fetch(k string) (interface{}, error) {
+	i, stored := c.c.Get(k)
+	if !stored {
+		return nil, ErrNotFound
+	}
+
+	return i, nil
+}
diff --git a/internal/cache/store.go b/internal/cache/store.go
new file mode 100644
index 000000000..6b4024476
--- /dev/null
+++ b/internal/cache/store.go
@@ -0,0 +1,24 @@
+/*
+   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 cache
+
+func (c *cache) Store(k string, v interface{}) error {
+	c.c.Set(k, v)
+	return nil
+}