Multiplayer client relay bridge and match lobby menu: WebSocket bridge, match lobby page, order relay, confirmed turns, checksums, chat, abort/resume

src/netplay.rs

@@ -14,6 +14,7 @@ pub const STEPS_PER_TURN: usize = 5;
 pub struct Netplay {
     pub turn: u32, // turns applied so far
     pub desync: bool, // a peer reported a different world
+    pub last_sum: u32, // last turn whose checksum was sent
 }
 
 const FNV_OFFSET: u64 = 0xcbf2_9ce4_8422_2325;
@@ -59,6 +60,11 @@ impl Game {
         self.netplay.is_some()
     }
 
+    // the relay ended a match, or the player leaves it: the world stops being a turn-based match
+    pub fn end_match(&mut self) {
+        self.netplay = None;
+    }
+
     // what the local master ordered since the last turn: these go to the server
     pub fn take_orders(&mut self) -> Vec<Command> {
         std::mem::take(&mut self.pending)
@@ -98,6 +104,27 @@ impl Game {
         false
     }
 
+    pub fn checksum_due(&mut self) -> Option<u32> {
+        let turn = match &self.netplay {
+            Some(np) => np.turn,
+            None => return None,
+        };
+        if turn < 10 {
+            return None;
+        }
+        let due = match &self.netplay {
+            Some(np) => turn.saturating_sub(np.last_sum) >= 10,
+            None => false,
+        };
+        if !due {
+            return None;
+        }
+        if let Some(np) = self.netplay.as_mut() {
+            np.last_sum = turn;
+        }
+        Some(turn)
+    }
+
     // the part of the world every client of a match has to agree on: the map, the creatures, the
     // economy of every master, the wave and the random state. Fog, particles and the camera are
     // local and stay out of it.