1 files changed, 67 insertions, 0 deletions
diff --git a/internal/caching/cache_federationevents.go b/internal/caching/cache_federationevents.go
new file mode 100644
index 00000000..a48c11fd
--- /dev/null
+++ b/internal/caching/cache_federationevents.go
@@ -0,0 +1,67 @@
+package caching
+
+import (
+	"fmt"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const (
+	FederationEventCacheName       = "federation_event"
+	FederationEventCacheMaxEntries = 256
+	FederationEventCacheMutable    = true // to allow use of Unset only
+)
+
+// FederationSenderCache contains the subset of functions needed for
+// a federation event cache.
+type FederationSenderCache interface {
+	GetFederationSenderQueuedPDU(eventNID int64) (event *gomatrixserverlib.HeaderedEvent, ok bool)
+	StoreFederationSenderQueuedPDU(eventNID int64, event *gomatrixserverlib.HeaderedEvent)
+	EvictFederationSenderQueuedPDU(eventNID int64)
+
+	GetFederationSenderQueuedEDU(eventNID int64) (event *gomatrixserverlib.EDU, ok bool)
+	StoreFederationSenderQueuedEDU(eventNID int64, event *gomatrixserverlib.EDU)
+	EvictFederationSenderQueuedEDU(eventNID int64)
+}
+
+func (c Caches) GetFederationSenderQueuedPDU(eventNID int64) (*gomatrixserverlib.HeaderedEvent, bool) {
+	key := fmt.Sprintf("%d", eventNID)
+	val, found := c.FederationEvents.Get(key)
+	if found && val != nil {
+		if event, ok := val.(*gomatrixserverlib.HeaderedEvent); ok {
+			return event, true
+		}
+	}
+	return nil, false
+}
+
+func (c Caches) StoreFederationSenderQueuedPDU(eventNID int64, event *gomatrixserverlib.HeaderedEvent) {
+	key := fmt.Sprintf("%d", eventNID)
+	c.FederationEvents.Set(key, event)
+}
+
+func (c Caches) EvictFederationSenderQueuedPDU(eventNID int64) {
+	key := fmt.Sprintf("%d", eventNID)
+	c.FederationEvents.Unset(key)
+}
+
+func (c Caches) GetFederationSenderQueuedEDU(eventNID int64) (*gomatrixserverlib.EDU, bool) {
+	key := fmt.Sprintf("%d", eventNID)
+	val, found := c.FederationEvents.Get(key)
+	if found && val != nil {
+		if event, ok := val.(*gomatrixserverlib.EDU); ok {
+			return event, true
+		}
+	}
+	return nil, false
+}
+
+func (c Caches) StoreFederationSenderQueuedEDU(eventNID int64, event *gomatrixserverlib.EDU) {
+	key := fmt.Sprintf("%d", eventNID)
+	c.FederationEvents.Set(key, event)
+}
+
+func (c Caches) EvictFederationSenderQueuedEDU(eventNID int64) {
+	key := fmt.Sprintf("%d", eventNID)
+	c.FederationEvents.Unset(key)
+}