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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()
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