feat(c-bindings): seenTTL

library/README.md

@@ -439,6 +439,9 @@ If a key is `undefined`, or `null`, a default value will be set.
   Default `10`
 - `iWantFollowupTimeSeconds`: Time to wait for a message requested through IWANT following an IHAVE advertisement.
   Default `3` seconds
+- `seenMessagesTTLSeconds`: configures when a previously seen message ID can be forgotten about.
+  Default `120` seconds
+
 
 ### `extern char* waku_new(char* jsonConfig)`
 

library/api.go

@@ -57,6 +57,7 @@ func main() {}
 //   - maxIHaveLength: max number of messages to include in an IHAVE message, also controls the max number of IHAVE ids we will accept and request with IWANT from a peer within a heartbeat. Default `5000`
 //   - maxIHaveMessages: max number of IHAVE messages to accept from a peer within a heartbeat. Default `10`
 //   - iWantFollowupTimeSeconds: Time to wait for a message requested through IWANT following an IHAVE advertisement. Default `3` seconds
+//   - seenMessagesTTLSeconds:  configures when a previously seen message ID can be forgotten about. Default `120` seconds
 //
 // - minPeersToPublish: The minimum number of peers required on a topic to allow broadcasting a message. Default `0`
 // - filter: Enable Filter. Default `false`

mobile/api.go

@@ -101,6 +101,8 @@ func NewNode(configJSON string) string {
 			pubsubOpt = append(pubsubOpt, pubsub.WithGossipSubParams(params))
 		}
 
+		pubsubOpt = append(pubsubOpt, pubsub.WithSeenMessagesTTL(GetSeenTTL(config)))
+
 		opts = append(opts, node.WithWakuRelayAndMinPeers(*config.MinPeersToPublish, pubsubOpt...))
 	}
 

mobile/config.go

@@ -185,6 +185,9 @@ type GossipSubParams struct {
 	// If the message is not received within this window, a broken promise is declared and
 	// the router may apply bahavioural penalties.
 	IWantFollowupTimeSeconds *int `json:"iWantFollowupTimeSeconds,omitempty"`
+
+	// configures when a previously seen message ID can be forgotten about
+	SeenMessagesTTLSeconds *int `json:"seenMessagesTTLSeconds"`
 }
 
 func getConfig(configJSON string) (wakuConfig, error) {
@@ -255,6 +258,14 @@ func getConfig(configJSON string) (wakuConfig, error) {
 	return config, nil
 }
 
+func GetSeenTTL(cfg wakuConfig) time.Duration {
+	if cfg.GossipSubParams == nil || *cfg.GossipSubParams.SeenMessagesTTLSeconds == 0 {
+		return pubsub.TimeCacheDuration
+	}
+
+	return time.Duration(*cfg.GossipSubParams.SeenMessagesTTLSeconds)
+}
+
 func GetGossipSubParams(cfg *GossipSubParams) pubsub.GossipSubParams {
 	params := pubsub.DefaultGossipSubParams()