#!/usr/bin/env python3
"""Pipeline Lab server — serves notebook UI on :3500, proxies API to sidecar :3200."""
import http.server
import json
import urllib.request
import urllib.error
PORT = 3500
SIDECAR = "http://localhost:3200"
class LabHandler(http.server.BaseHTTPRequestHandler):
def log_message(self, fmt, *args):
pass # quiet
def do_GET(self):
if self.path == "/" or self.path == "":
self._serve_ui()
elif self.path.startswith("/lab/"):
self._proxy("GET")
else:
self.send_error(404)
def do_POST(self):
if self.path.startswith("/lab/"):
self._proxy("POST")
else:
self.send_error(404)
def do_DELETE(self):
if self.path.startswith("/lab/"):
self._proxy("DELETE")
else:
self.send_error(404)
def _proxy(self, method):
"""Proxy request to sidecar."""
url = SIDECAR + self.path
body = None
if method in ("POST", "PUT"):
length = int(self.headers.get("Content-Length", 0))
body = self.rfile.read(length) if length else None
req = urllib.request.Request(url, data=body, method=method)
req.add_header("Content-Type", self.headers.get("Content-Type", "application/json"))
try:
with urllib.request.urlopen(req, timeout=120) as resp:
data = resp.read()
self.send_response(resp.status)
self.send_header("Content-Type", resp.headers.get("Content-Type", "application/json"))
self.send_header("Access-Control-Allow-Origin", "*")
self.end_headers()
self.wfile.write(data)
except urllib.error.HTTPError as e:
self.send_response(e.code)
self.send_header("Content-Type", "application/json")
self.end_headers()
self.wfile.write(e.read())
except Exception as e:
self.send_response(502)
self.send_header("Content-Type", "application/json")
self.end_headers()
self.wfile.write(json.dumps({"error": str(e)}).encode())
def _serve_ui(self):
self.send_response(200)
self.send_header("Content-Type", "text/html; charset=utf-8")
self.end_headers()
self.wfile.write(HTML.encode())
HTML = r"""
Pipeline Lab — Lakehouse
Pipeline Lab // Lakehouse
Embedding-based screening vs LLM classification — iterative experimentation
Exemplars: 0
Categories: 0
Pipelines: 0
Sidecar: ...
"""
if __name__ == "__main__":
print(f"Pipeline Lab running on http://0.0.0.0:{PORT}")
server = http.server.HTTPServer(("0.0.0.0", PORT), LabHandler)
server.serve_forever()