show where a user seeked from

frontend/lib/chat.mjs

@@ -200,10 +200,22 @@ export const logEventToChat = (event) => {
     }
     case "SetTime": {
       const messageContent = document.createElement("span");
-      messageContent.appendChild(document.createTextNode("set the time to "));
+      if (event.data.from != undefined) {
+        messageContent.appendChild(
+          document.createTextNode("set the time from ")
+        );
 
         messageContent.appendChild(
-        document.createTextNode(formatTime(event.data))
+          document.createTextNode(formatTime(event.data.from))
+        );
+
+        messageContent.appendChild(document.createTextNode(" to "));
+      } else {
+        messageContent.appendChild(document.createTextNode("set the time to "));
+      }
+
+      messageContent.appendChild(
+        document.createTextNode(formatTime(event.data.to))
       );
 
       printChatMessage("set-time", event.user, event.colour, messageContent);

frontend/lib/watch-session.mjs

@@ -137,7 +137,9 @@ const setupOutgoingEvents = (video, socket) => {
     socket.send(
       JSON.stringify({
         op: "SetTime",
-        data: currentVideoTime(),
+        data: {
+          to: currentVideoTime(),
+        },
       })
     );
   });

src/events.rs

@@ -3,13 +3,20 @@ use serde::{Deserialize, Serialize};
 #[derive(Clone, Serialize, Deserialize)]
 #[serde(tag = "op", content = "data")]
 pub enum WatchEventData {
-    SetPlaying { playing: bool, time: u64 },
-    SetTime(u64),
+    SetPlaying {
+        playing: bool,
+        time: u64,
+    },
+    SetTime {
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        from: Option<u64>,
+        to: u64,
+    },
 
     UserJoin,
     UserLeave,
     ChatMessage(String),
-    Ping(String)
+    Ping(String),
 }
 
 #[derive(Clone, Serialize, Deserialize)]

src/viewer_connection.rs

@@ -84,11 +84,18 @@ pub async fn ws_subscribe(session_uuid: Uuid, nickname: String, colour: String,
             None => continue,
         };
 
-        handle_watch_event_data(
-            session_uuid,
-            &mut get_session(session_uuid).unwrap(),
-            event.clone(),
-        );
+        let session = &mut get_session(session_uuid).unwrap();
+
+        // server side event modification where neccessary
+        let event: WatchEventData = match event {
+            WatchEventData::SetTime { from: _, to } => WatchEventData::SetTime {
+                from: Some(session.get_time_ms()),
+                to: to,
+            },
+            _ => event,
+        };
+
+        handle_watch_event_data(session_uuid, session, event.clone());
 
         ws_publish(
             session_uuid,

src/watch_session.rs

@@ -85,8 +85,8 @@ pub fn handle_watch_event_data(
             watch_session.set_playing(playing, time);
         }
 
-        WatchEventData::SetTime(time) => {
-            watch_session.set_time_ms(time);
+        WatchEventData::SetTime { from: _, to } => {
+            watch_session.set_time_ms(to);
         }
 
         _ => {}