From 7246016b8bee686e4cf37484abafbb9814588a12 Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Fri, 23 May 2025 14:23:52 -0500
Subject: [PATCH] example nat

---
 examples/nat.js        | 29 +++++++++++++++++++++++++++++
 examples/nat_client.js | 22 ++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 examples/nat.js
 create mode 100644 examples/nat_client.js

diff --git a/examples/nat.js b/examples/nat.js
new file mode 100644
index 00000000..a8779321
--- /dev/null
+++ b/examples/nat.js
@@ -0,0 +1,29 @@
+// NAT Punchthrough Server
+// This server helps two chess clients find each other through NAT
+// The server coordinates the punchthrough by having both clients
+// connect to each other simultaneously
+
+var json = use('json');
+var waiting_client = null;
+var match_id = 0;
+
+$_.portal(e => {
+  console.log("NAT server: received connection request");
+  
+  if (!is_actor(e.actor))
+    send(e, {reason: "Must provide the actor you want to connect."});
+
+  if (waiting_client) {
+    console.log(`sending out messages! to ${json.encode(e.actor)} and ${json.encode(waiting_client.actor)}`)
+    send(waiting_client, e.actor)
+    send(e, waiting_client.actor)
+    
+    waiting_client = undefined
+    
+    return
+  }
+  
+  waiting_client = e
+  
+  console.log(`actor ${json.encode(e.actor)} is waiting ...`)
+}, 4000);
diff --git a/examples/nat_client.js b/examples/nat_client.js
new file mode 100644
index 00000000..00434e5c
--- /dev/null
+++ b/examples/nat_client.js
@@ -0,0 +1,22 @@
+console.log(`nat client starting`)
+
+$_.contact((actor, reason) => {
+  if (actor) {
+    console.log(`trying to message ${json.encode(actor)}`)
+    send(actor, {type:"greet"})
+  } else {
+    console.log(json.encode(reason))
+  }
+}, {
+  address: "108.210.60.32",  // NAT server's public IP
+  port: 4000,
+  actor: $_
+})
+
+$_.receiver(e => {
+  switch(e.type) {
+    case 'greet':
+      console.log(`hello!`)
+      break
+  }
+})
\ No newline at end of file