refine app listen address message

pywebio/platform/aiohttp.py

@@ -11,7 +11,7 @@ from aiohttp import web
 
 from .remote_access import start_remote_access_service
 from .tornado import open_webbrowser_on_server_started
-from .utils import make_applications, render_page, cdn_validation, deserialize_binary_event
+from .utils import make_applications, render_page, cdn_validation, deserialize_binary_event, print_listen_address
 from ..session import CoroutineBasedSession, ThreadBasedSession, register_session_implement_for_target, Session
 from ..session.base import get_session_info_from_headers
 from ..utils import get_free_port, STATIC_PATH, iscoroutinefunction, isgeneratorfunction
@@ -205,7 +205,7 @@ def start_server(applications, port=0, host='', debug=False,
     if debug:
         logging.getLogger("asyncio").setLevel(logging.DEBUG)
 
-    print('Listen on %s:%s' % (host, port))
+    print_listen_address(host, port)
 
     if remote_access:
         start_remote_access_service(local_port=port)

pywebio/platform/path_deploy.py

@@ -12,7 +12,7 @@ from . import utils
 from .httpbased import HttpHandler
 from .tornado import webio_handler, set_ioloop
 from .tornado_http import TornadoHttpContext
-from .utils import cdn_validation, make_applications
+from .utils import cdn_validation, make_applications, print_listen_address
 from ..session import register_session_implement, CoroutineBasedSession, ThreadBasedSession, Session
 from ..utils import get_free_port, STATIC_PATH, parse_file_size
 
@@ -209,7 +209,7 @@ def _path_deploy(base, port=0, host='', static_dir=None, cdn=True, max_payload_s
         handlers.append((r"/_pywebio_static/(.*)", StaticFileHandler, {"path": STATIC_PATH}))
     handlers.append((r"/.*", RequestHandler))
 
-    print('Listen on %s:%s' % (host or '0.0.0.0', port))
+    print_listen_address(host, port)
 
     set_ioloop(tornado.ioloop.IOLoop.current())  # to enable bokeh app
     app = tornado.web.Application(handlers=handlers, **tornado_app_settings)

pywebio/platform/tornado.py

@@ -18,7 +18,7 @@ from tornado.websocket import WebSocketHandler
 
 from . import utils
 from .remote_access import start_remote_access_service
-from .utils import make_applications, render_page, cdn_validation, deserialize_binary_event
+from .utils import make_applications, render_page, cdn_validation, deserialize_binary_event, print_listen_address
 from ..session import CoroutineBasedSession, ThreadBasedSession, ScriptModeSession, \
     register_session_implement_for_target, Session
 from ..session.base import get_session_info_from_headers
@@ -361,7 +361,7 @@ def start_server(applications, port=0, host='',
     _, port = _setup_server(webio_handler=handler, port=port, host=host, static_dir=static_dir,
                             max_buffer_size=max_payload_size, **tornado_app_settings)
 
-    print('Listen on %s:%s' % (host or '0.0.0.0', port))
+    print_listen_address(host, port)
 
     if auto_open_webbrowser:
         tornado.ioloop.IOLoop.current().spawn_callback(open_webbrowser_on_server_started, host or 'localhost', port)

pywebio/platform/tornado_http.py

@@ -9,7 +9,7 @@ from . import utils
 from ..session import Session
 from .httpbased import HttpContext, HttpHandler
 from .tornado import set_ioloop, _setup_server, open_webbrowser_on_server_started
-from .utils import cdn_validation
+from .utils import cdn_validation, print_listen_address
 from ..utils import parse_file_size
 
 logger = logging.getLogger(__name__)
@@ -157,7 +157,7 @@ def start_server(applications, port=8080, host='',
     _, port = _setup_server(webio_handler=handler, port=port, host=host, static_dir=static_dir,
                             max_buffer_size=parse_file_size(max_payload_size), **tornado_app_settings)
 
-    print('Listen on %s:%s' % (host or '0.0.0.0', port))
+    print_listen_address(host, port)
     if auto_open_webbrowser:
         tornado.ioloop.IOLoop.current().spawn_callback(open_webbrowser_on_server_started, host or 'localhost', port)
 

pywebio/platform/utils.py

@@ -1,14 +1,15 @@
 import fnmatch
 import json
+import socket
 import urllib.parse
 from collections import defaultdict
 from collections import namedtuple
 from collections.abc import Mapping, Sequence
+from functools import lru_cache
 from functools import partial
 from os import path, environ
 
 from tornado import template
-from functools import lru_cache
 
 from ..__version__ import __version__ as version
 from ..exceptions import PyWebIOWarning
@@ -275,6 +276,48 @@ def deserialize_binary_event(data: bytes):
     return event
 
 
+def get_interface_ip(family: socket.AddressFamily) -> str:
+    """Get the IP address of an external interface. Used when binding to
+    0.0.0.0 or :: to show a more useful URL.
+
+    Copy from https://github.com/pallets/werkzeug/blob/df7492ab66aaced5eea964a58309caaadb1e8903/src/werkzeug/serving.py
+    Under BSD-3-Clause License
+    """
+    # arbitrary private address
+    host = "fd31:f903:5ab5:1::1" if family == socket.AF_INET6 else "10.253.155.219"
+
+    with socket.socket(family, socket.SOCK_DGRAM) as s:
+        try:
+            s.connect((host, 58162))
+        except OSError:
+            return "::1" if family == socket.AF_INET6 else "127.0.0.1"
+
+        return s.getsockname()[0]  # type: ignore
+
+
+def print_listen_address(host, port):
+    if not host:
+        host = '0.0.0.0'
+
+    all_address = False
+    if host == "0.0.0.0":
+        all_address = True
+        host = get_interface_ip(socket.AF_INET)
+    elif host == "::":
+        all_address = True
+        host = get_interface_ip(socket.AF_INET6)
+
+    if ':' in host:  # ipv6
+        host = '[%s]' % host
+
+    if all_address:
+        print('Running on all addresses.')
+        print('Use http://%s:%s/ to access the application' % (host, port))
+    else:
+        print('Running on http://%s:%s/' % (host, port))
+
+
+
 def seo(title, description=None, app=None):
     """Set the SEO information of the PyWebIO application (web page information provided when indexed by search engines)