#!/usr/bin/env python3
"""Minimal compact-peer HTTP tracker for the Phase 4 integration test."""
from http.server import BaseHTTPRequestHandler, HTTPServer
import socket
import struct
import sys

peer_port = int(sys.argv[1])
body = (
    b"d8:intervali1800e5:peers6:"
    + socket.inet_aton("127.0.0.1")
    + struct.pack("!H", peer_port)
    + b"e"
)


class Tracker(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header("Content-Type", "text/plain")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        self.wfile.write(body)

    def log_message(self, fmt, *args):
        print("REQUEST " + (fmt % args), flush=True)


server = HTTPServer(("127.0.0.1", 0), Tracker)
print("PORT %d" % server.server_port, flush=True)
server.serve_forever()