From b0644c3a17dfd1a55f4ed5f4f91fcc84e74359ed Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Fri, 21 Feb 2020 19:28:00 +0100
Subject: Basic backlogging

---
 appservice/account.go | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'appservice')

diff --git a/appservice/account.go b/appservice/account.go
index 3791ee3..e2f2ee9 100644
--- a/appservice/account.go
+++ b/appservice/account.go
@@ -230,7 +230,7 @@ func (a *Account) eventInternal(event *Event) error {
 		err = mx.RoomInvite(mx_room_id, mx_user_id)
 		if err != nil {
 			if strings.Contains(err.Error(), "already in the room") {
-				err = nil
+				return nil
 			}
 			return err
 		}
@@ -260,6 +260,16 @@ func (a *Account) eventInternal(event *Event) error {
 			}
 		}
 
+		if event.Id != "" {
+			cache_key := fmt.Sprintf("%s/event_seen/%s/%s",
+				a.Protocol, mx_room_id, event.Id)
+			if !dbCacheTestAndSet(cache_key, "yes") {
+				// false: cache key was not modified, meaning we
+				// already saw the event
+				return nil
+			}
+		}
+
 		typ := "m.text"
 		if event.Type == EVENT_ACTION {
 			typ = "m.emote"
-- 
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