from contextlib import contextmanager import logging import requests from retrying import retry import subprocess import yaml from time import sleep from constants import METRICS_PORT, MAX_RETRIES, BACKOFF_SECS LOGGER = logging.getLogger(__name__) def write_config(directory, config): config_path = directory / "config.yml" with open(config_path, 'w') as outfile: yaml.dump(config, outfile) return config_path def start_cloudflared(directory, config, cfd_args=["run"], cfd_pre_args=["tunnel"], new_process=False, allow_input=False, capture_output=True, root=False): config_path = write_config(directory, config.full_config) cmd = cloudflared_cmd(config, config_path, cfd_args, cfd_pre_args, root) if new_process: return run_cloudflared_background(cmd, allow_input, capture_output) # By setting check=True, it will raise an exception if the process exits with non-zero exit code return subprocess.run(cmd, check=True, capture_output=capture_output) def cloudflared_cmd(config, config_path, cfd_args, cfd_pre_args, root): cmd = [] if root: cmd += ["sudo"] cmd += [config.cloudflared_binary] cmd += cfd_pre_args cmd += ["--config", config_path] cmd += cfd_args LOGGER.info(f"Run cmd {cmd} with config {config}") return cmd @contextmanager def run_cloudflared_background(cmd, allow_input, capture_output): output = subprocess.PIPE if capture_output else subprocess.DEVNULL stdin = subprocess.PIPE if allow_input else None try: cfd = subprocess.Popen(cmd, stdin=stdin, stdout=output, stderr=output) yield cfd finally: cfd.terminate() if capture_output: LOGGER.info( f"cloudflared log: {cfd.stderr.read()}") @retry(stop_max_attempt_number=MAX_RETRIES, wait_fixed=BACKOFF_SECS * 1000) def wait_tunnel_ready(tunnel_url=None, require_min_connections=1): metrics_url = f'http://localhost:{METRICS_PORT}/ready' with requests.Session() as s: resp = send_request(s, metrics_url, True) assert resp.json()[ "readyConnections"] >= require_min_connections, f"Ready endpoint returned {resp.json()} but we expect at least {require_min_connections} connections" if tunnel_url is not None: send_request(s, tunnel_url, True) @retry(stop_max_attempt_number=MAX_RETRIES * BACKOFF_SECS, wait_fixed=1000) def check_tunnel_not_connected(): url = f'http://localhost:{METRICS_PORT}/ready' try: resp = requests.get(url, timeout=1) assert resp.status_code == 503, f"Expect {url} returns 503, got {resp.status_code}" # cloudflared might already terminate except requests.exceptions.ConnectionError as e: LOGGER.warning(f"Failed to connect to {url}, error: {e}") # In some cases we don't need to check response status, such as when sending batch requests to generate logs def send_requests(url, count, require_ok=True): errors = 0 with requests.Session() as s: for _ in range(count): resp = send_request(s, url, require_ok) if resp is None: errors += 1 sleep(0.01) if errors > 0: LOGGER.warning( f"{errors} out of {count} requests to {url} return non-200 status") @retry(stop_max_attempt_number=MAX_RETRIES, wait_fixed=BACKOFF_SECS * 1000) def send_request(session, url, require_ok): resp = session.get(url, timeout=BACKOFF_SECS) if require_ok: assert resp.status_code == 200, f"{url} returned {resp}" return resp if resp.status_code == 200 else None