From 647bc578188ba0890de30d76c899c703b2d3fb35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Saillant?= <vjclearscreen@gmail.com>
Date: Mon, 15 Jun 2026 00:50:11 +0200
Subject: [PATCH] feat(tower): register server + delta push to box

---
 tower/lisael_server.py | 58 ++++++++++++++++++++++++++++++++++++++++++
 tower/test_delta.py    | 14 ++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 tower/lisael_server.py
 create mode 100644 tower/test_delta.py

diff --git a/tower/lisael_server.py b/tower/lisael_server.py
new file mode 100644
index 0000000..e86492f
--- /dev/null
+++ b/tower/lisael_server.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+"""Always-on: POST /register {id, have} -> push the staging delta to the box's
+file-server (:8080). The box IP is the request source address."""
+import json, os, urllib.request
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+
+STAGING = os.environ.get("LISAEL_STAGING", "/home/clems/lisael-content/podcasts")
+PORT     = int(os.environ.get("LISAEL_PORT", "9555"))
+BOX_PORT = int(os.environ.get("LISAEL_BOX_PORT", "8080"))
+
+def staging_files():
+    if not os.path.isdir(STAGING):
+        return []
+    return sorted(f for f in os.listdir(STAGING) if not f.startswith("."))
+
+def compute_delta(staging, have):
+    """Files the box is missing; manifest.json only when something else changed."""
+    haveset = set(have)
+    files = [f for f in staging if f != "manifest.json" and f not in haveset]
+    if files and "manifest.json" in staging:
+        files.append("manifest.json")
+    return files
+
+def push_file(ip, name):
+    data = open(os.path.join(STAGING, name), "rb").read()
+    url = f"http://{ip}:{BOX_PORT}/put?name=podcasts/{name}"
+    with urllib.request.urlopen(urllib.request.Request(url, data=data, method="POST"),
+                                timeout=40) as r:
+        return r.status
+
+class H(BaseHTTPRequestHandler):
+    def do_POST(self):
+        if self.path.split("?")[0] != "/register":
+            self.send_error(404); return
+        ip = self.client_address[0]
+        try:
+            n = int(self.headers.get("Content-Length", 0))
+            body = json.loads(self.rfile.read(n) or b"{}")
+        except Exception:
+            self.send_error(400); return
+        delta = compute_delta(staging_files(), body.get("have", []) or [])
+        print(f"register {ip} id={body.get('id')} have={len(body.get('have',[]) or [])} push={len(delta)}",
+              flush=True)
+        ok = 0
+        for f in delta:
+            try:
+                push_file(ip, f); ok += 1
+            except Exception as e:
+                print("push fail", f, e, flush=True)
+        self.send_response(200); self.send_header("Content-Type", "application/json"); self.end_headers()
+        self.wfile.write(json.dumps({"pushed": ok, "of": len(delta)}).encode())
+
+    def log_message(self, *a):
+        pass
+
+if __name__ == "__main__":
+    print(f"lisael-content on :{PORT} staging={STAGING}", flush=True)
+    ThreadingHTTPServer(("0.0.0.0", PORT), H).serve_forever()
diff --git a/tower/test_delta.py b/tower/test_delta.py
new file mode 100644
index 0000000..84963f4
--- /dev/null
+++ b/tower/test_delta.py
@@ -0,0 +1,14 @@
+from lisael_server import compute_delta
+
+def test_delta():
+    stg = ["oli_01.m4a", "oli.bin", "bestioles_01.mp3", "manifest.json"]
+    # empty box -> everything, manifest last
+    assert compute_delta(stg, []) == ["oli_01.m4a", "oli.bin", "bestioles_01.mp3", "manifest.json"]
+    # up-to-date box -> nothing (not even the manifest)
+    assert compute_delta(stg, ["oli_01.m4a", "oli.bin", "bestioles_01.mp3"]) == []
+    # box missing the cover -> .bin + manifest
+    assert compute_delta(stg, ["oli_01.m4a", "bestioles_01.mp3"]) == ["oli.bin", "manifest.json"]
+    print("OK")
+
+if __name__ == "__main__":
+    test_delta()