core: Handle connection close for contacts

core/contact.go

@@ -191,3 +191,30 @@ func (c *Contact) shouldReplaceConnection(conn *protocol.OpenConnection) bool {
 	}
 	return false
 }
+
+func (c *Contact) OnConnectionClosed(conn *protocol.OpenConnection) {
+	c.mutex.Lock()
+
+	if c.connection != conn {
+		c.mutex.Unlock()
+		return
+	}
+
+	c.connection = nil
+	c.status = ricochet.Contact_OFFLINE
+
+	config := c.core.Config.OpenWrite()
+	c.data.LastConnected = time.Now().Format(time.RFC3339)
+	config.Contacts[strconv.Itoa(c.id)] = c.data
+	config.Save()
+
+	c.mutex.Unlock()
+
+	event := ricochet.ContactEvent{
+		Type: ricochet.ContactEvent_UPDATE,
+		Subject: &ricochet.ContactEvent_Contact{
+			Contact: c.Data(),
+		},
+	}
+	c.events.Publish(event)
+}

core/protocol.go

@@ -61,6 +61,16 @@ func (handler *protocolHandler) OnConnect(oc *protocol.OpenConnection) {
 	}
 }
 
+func (handler *protocolHandler) OnDisconnect(oc *protocol.OpenConnection) {
+	log.Printf("protocol: OnDisconnect: %v", oc)
+	if oc.OtherHostname != "" {
+		contact := handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + oc.OtherHostname)
+		if contact != nil {
+			contact.OnConnectionClosed(oc)
+		}
+	}
+}
+
 // Authentication Management
 func (handler *protocolHandler) OnAuthenticationRequest(oc *protocol.OpenConnection, channelID int32, clientCookie [16]byte) {
 	log.Printf("protocol: OnAuthenticationRequest")