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| """ | |
| A Simple server used to show altair graphics from a prompt or script. | |
| This is adapted from the mpld3 package; see | |
| https://github.com/mpld3/mpld3/blob/master/mpld3/_server.py | |
| """ | |
| import sys | |
| import threading | |
| import webbrowser | |
| import socket | |
| from http import server | |
| from io import BytesIO as IO | |
| import itertools | |
| import random | |
| JUPYTER_WARNING = """ | |
| Note: if you're in the Jupyter notebook, Chart.serve() is not the best | |
| way to view plots. Consider using Chart.display(). | |
| You must interrupt the kernel to cancel this command. | |
| """ | |
| # Mock server used for testing | |
| class MockRequest: | |
| def makefile(self, *args, **kwargs): | |
| return IO(b"GET /") | |
| def sendall(self, response): | |
| pass | |
| class MockServer: | |
| def __init__(self, ip_port, Handler): | |
| Handler(MockRequest(), ip_port[0], self) | |
| def serve_forever(self): | |
| pass | |
| def server_close(self): | |
| pass | |
| def generate_handler(html, files=None): | |
| if files is None: | |
| files = {} | |
| class MyHandler(server.BaseHTTPRequestHandler): | |
| def do_GET(self): | |
| """Respond to a GET request.""" | |
| if self.path == "/": | |
| self.send_response(200) | |
| self.send_header("Content-type", "text/html") | |
| self.end_headers() | |
| self.wfile.write(html.encode()) | |
| elif self.path in files: | |
| content_type, content = files[self.path] | |
| self.send_response(200) | |
| self.send_header("Content-type", content_type) | |
| self.end_headers() | |
| self.wfile.write(content.encode()) | |
| else: | |
| self.send_error(404) | |
| return MyHandler | |
| def find_open_port(ip, port, n=50): | |
| """Find an open port near the specified port""" | |
| ports = itertools.chain( | |
| (port + i for i in range(n)), (port + random.randint(-2 * n, 2 * n)) | |
| ) | |
| for port in ports: | |
| s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
| result = s.connect_ex((ip, port)) | |
| s.close() | |
| if result != 0: | |
| return port | |
| raise ValueError("no open ports found") | |
| def serve( | |
| html, | |
| ip="127.0.0.1", | |
| port=8888, | |
| n_retries=50, | |
| files=None, | |
| jupyter_warning=True, | |
| open_browser=True, | |
| http_server=None, | |
| ): | |
| """Start a server serving the given HTML, and (optionally) open a browser | |
| Parameters | |
| ---------- | |
| html : string | |
| HTML to serve | |
| ip : string (default = '127.0.0.1') | |
| ip address at which the HTML will be served. | |
| port : int (default = 8888) | |
| the port at which to serve the HTML | |
| n_retries : int (default = 50) | |
| the number of nearby ports to search if the specified port is in use. | |
| files : dictionary (optional) | |
| dictionary of extra content to serve | |
| jupyter_warning : bool (optional) | |
| if True (default), then print a warning if this is used within Jupyter | |
| open_browser : bool (optional) | |
| if True (default), then open a web browser to the given HTML | |
| http_server : class (optional) | |
| optionally specify an HTTPServer class to use for showing the | |
| figure. The default is Python's basic HTTPServer. | |
| """ | |
| port = find_open_port(ip, port, n_retries) | |
| Handler = generate_handler(html, files) | |
| if http_server is None: | |
| srvr = server.HTTPServer((ip, port), Handler) | |
| else: | |
| srvr = http_server((ip, port), Handler) | |
| if jupyter_warning: | |
| try: | |
| __IPYTHON__ # noqa | |
| except NameError: | |
| pass | |
| else: | |
| print(JUPYTER_WARNING) | |
| # Start the server | |
| print("Serving to http://{}:{}/ [Ctrl-C to exit]".format(ip, port)) | |
| sys.stdout.flush() | |
| if open_browser: | |
| # Use a thread to open a web browser pointing to the server | |
| def b(): | |
| return webbrowser.open("http://{}:{}".format(ip, port)) | |
| threading.Thread(target=b).start() | |
| try: | |
| srvr.serve_forever() | |
| except (KeyboardInterrupt, SystemExit): | |
| print("\nstopping Server...") | |
| srvr.server_close() | |