I'm trying to create multithreaded web server in python, but it only responds to one request at a time and I can't figure out why. Can you help me, please?
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
from SocketServer import ThreadingMixIn
from BaseHTTPServer import HTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
from time import sleep
class ThreadingServer(ThreadingMixIn, HTTPServer):
pass
class RequestHandler(SimpleHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.send_header('Content-type', 'text/plain')
sleep(5)
response = 'Slept for 5 seconds..'
self.send_header('Content-length', len(response))
self.end_headers()
self.wfile.write(response)
ThreadingServer(('', 8000), RequestHandler).serve_forever()
Check this post from Doug Hellmann's blog.
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
from SocketServer import ThreadingMixIn
import threading
class Handler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.end_headers()
message = threading.currentThread().getName()
self.wfile.write(message)
self.wfile.write('\n')
return
class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
"""Handle requests in a separate thread."""
if __name__ == '__main__':
server = ThreadedHTTPServer(('localhost', 8080), Handler)
print 'Starting server, use <Ctrl-C> to stop'
server.serve_forever()
I have developed a PIP Utility called ComplexHTTPServer that is a multi-threaded version of SimpleHTTPServer.
To install it, all you need to do is:
pip install ComplexHTTPServer
Using it is as simple as:
python -m ComplexHTTPServer [PORT]
(By default, the port is 8000.)
In python3, you can use the code below (https or http):
from http.server import HTTPServer, BaseHTTPRequestHandler
from socketserver import ThreadingMixIn
import threading
USE_HTTPS = True
class Handler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.end_headers()
self.wfile.write(b'Hello world\t' + threading.currentThread().getName().encode() + b'\t' + str(threading.active_count()).encode() + b'\n')
class ThreadingSimpleServer(ThreadingMixIn, HTTPServer):
pass
def run():
server = ThreadingSimpleServer(('0.0.0.0', 4444), Handler)
if USE_HTTPS:
import ssl
server.socket = ssl.wrap_socket(server.socket, keyfile='./key.pem', certfile='./cert.pem', server_side=True)
server.serve_forever()
if __name__ == '__main__':
run()
You will figure out this code will create a new thread to deal with every request.
Command below to generate self-sign certificate:
openssl req -x509 -newkey rsa:4096 -nodes -out cert.pem -keyout key.pem -days 365
If you are using Flask, this blog is great.
It's amazing how many votes these solutions that break streaming are getting. If streaming might be needed down the road, then ThreadingMixIn and gunicorn are no good because they just collect up the response and write it as a unit at the end (which actually does nothing if your stream is infinite).
Your basic approach of combining BaseHTTPServer with threads is fine. But the default BaseHTTPServer settings re-bind a new socket on every listener, which won't work in Linux if all the listeners are on the same port. Change those settings before the serve_forever() call. (Just like you have to set self.daemon = True on a thread to stop ctrl-C from being disabled.)
The following example launches 100 handler threads on the same port, with each handler started through BaseHTTPServer.
import time, threading, socket, SocketServer, BaseHTTPServer
class Handler(BaseHTTPServer.BaseHTTPRequestHandler):
def do_GET(self):
if self.path != '/':
self.send_error(404, "Object not found")
return
self.send_response(200)
self.send_header('Content-type', 'text/html; charset=utf-8')
self.end_headers()
# serve up an infinite stream
i = 0
while True:
self.wfile.write("%i " % i)
time.sleep(0.1)
i += 1
# Create ONE socket.
addr = ('', 8000)
sock = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(addr)
sock.listen(5)
# Launch 100 listener threads.
class Thread(threading.Thread):
def __init__(self, i):
threading.Thread.__init__(self)
self.i = i
self.daemon = True
self.start()
def run(self):
httpd = BaseHTTPServer.HTTPServer(addr, Handler, False)
# Prevent the HTTP server from re-binding every handler.
# https://stackoverflow.com/questions/46210672/
httpd.socket = sock
httpd.server_bind = self.server_close = lambda self: None
httpd.serve_forever()
[Thread(i) for i in range(100)]
time.sleep(9e9)
A multithreaded https server in python3.7
from http.server import BaseHTTPRequestHandler, HTTPServer
from socketserver import ThreadingMixIn
import threading
import ssl
hostName = "localhost"
serverPort = 8080
class MyServer(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.send_header("Content-type", "text/html")
self.end_headers()
self.wfile.write(bytes("<html><head><title>https://pythonbasics.org</title></head>", "utf-8"))
self.wfile.write(bytes("<p>Request: %s</p>" % self.path, "utf-8"))
self.wfile.write(bytes("<p>Thread: %s</p>" % threading.currentThread().getName(), "utf-8"))
self.wfile.write(bytes("<p>Thread Count: %s</p>" % threading.active_count(), "utf-8"))
self.wfile.write(bytes("<body>", "utf-8"))
self.wfile.write(bytes("<p>This is an example web server.</p>", "utf-8"))
self.wfile.write(bytes("</body></html>", "utf-8"))
class ThreadingSimpleServer(ThreadingMixIn,HTTPServer):
pass
if __name__ == "__main__":
webServer = ThreadingSimpleServer((hostName, serverPort), MyServer)
webServer.socket = ssl.wrap_socket(webServer.socket, keyfile='./privkey.pem',certfile='./certificate.pem', server_side=True)
print("Server started http://%s:%s" % (hostName, serverPort))
try:
webServer.serve_forever()
except KeyboardInterrupt:
pass
webServer.server_close()
print("Server stopped.")
you can test it in a browser: https://localhost:8080
the running result is:
enter image description here
enter image description here
remind that you can generate your own keyfile and certificate use
$openssl req -newkey rsa:2048 -keyout privkey.pem -x509 -days 36500 -out certificate.pem
To learn details about creating self-signed certificate with openssl:https://www.devdungeon.com/content/creating-self-signed-ssl-certificates-openssl
Related
Is it possible to update a html site hosted with builtin modules of python? This is a minimal example from https://pythonbasics.org/webserver/ I have extended a meta-tag to refresh the side every second. This looks like a hack to me. Is there any possible solution to make this more clean? I would like to avoid ajax and other external libraries.
# Python 3 server example
from http.server import BaseHTTPRequestHandler, HTTPServer
import time
hostName = "localhost"
serverPort = 8080
class MyServer(BaseHTTPRequestHandler):
output = []
def do_GET(self):
self.send_response(200)
self.send_header("Content-type", "text/html")
self.end_headers()
self.wfile.write(bytes("<html><head><title>https://pythonbasics.org</title>\n", "utf-8"))
self.wfile.write(bytes('<meta http-equiv="refresh" content="1">\n</head>', "utf-8"))
self.wfile.write(bytes("<body>", "utf-8"))
self.wfile.write(bytes("<p>This is an example web server.</p>", "utf-8"))
for text in MyServer.output:
self.wfile.write(bytes(text, "utf-8"))
self.wfile.write(bytes("</body></html>", "utf-8"))
def log_message(self, format, *args):
return
def http_serve():
webServer = HTTPServer((hostName, serverPort), MyServer)
print("Server started http://%s:%s" % (hostName, serverPort))
try:
webServer.serve_forever()
except KeyboardInterrupt:
pass
webServer.server_close()
print("Server stopped.")
from threading import Thread
thread_http_serve = Thread(target=http_serve)
thread_http_serve.start()
from time import sleep
for i in range(100):
text = "<p>sample data: " + str(i) + "</p>\n"
MyServer.output.append(text)
sleep(1)
I´m using HTTPServer to listen for incoming POST requests and serving them. All is working fine with that.
I need to add some periodic tasks in the script (every X seconds: do something). As the HTTP server takes full command after
def run(server_class=HTTPServer, handler_class=S, port=9999):
server_address = (ethernetIP, port)
httpd = server_class(server_address, handler_class)
httpd.serve_forever()
I guess if there´s any way to include a check for time.time() as part of:
class S(BaseHTTPRequestHandler):
def _set_response(self):
self.send_response(200)
self.send_header('Content-type', 'text/html')
self.end_headers()
def do_GET(self):
self._set_response()
self.wfile.write("GET request for {}".format(self.path).encode('utf-8'))
def do_POST(self):
# my stuff here
Any ideas are welcome. Thanks!
Thanks to #rdas for pointing me to the separate thread solution. I tried schedule but it didn´t work with the HTTP server, because I can´t tell the script to run the pending jobs.
I tried with threading, running my periodic task as deamon.. and it worked! Here´s the code structure:
import time
import threading
from http.server import BaseHTTPRequestHandler, HTTPServer
polTime = 60 # how often we touch the file
polFile = "myfile.abc"
# this is the deamon thread
def polUpdate():
while True:
thisSecond = int(time.time())
if thisSecond % polTime == 0: # every X seconds
f = open(polFile,"w")
f.close() # touch and close
time.sleep(1) # avoid loopbacks
return "should never come this way"
# here´s the http server starter
def run(server_class=HTTPServer, handler_class=S, port=9999):
server_address = (ethernetIP, port)
httpd = server_class(server_address, handler_class)
try:
httpd.serve_forever()
except KeyboardInterrupt:
pass
httpd.server_close()
sys.exit(1)
# init the thread as deamon
d = threading.Thread(target=polUpdate, name='Daemon')
d.setDaemon(True)
d.start()
# runs the HTTP server
run(port=conf_port)
The HTTP server doesn´t block the thread, so it works great.
By the way, I´m using the file 'touching' as proof of life for the process.
I am using a python script to do my webserver using the BaseHTTPServer module. I would like to only accept requests from a specific range of IPs. How do I do that?
EDIT:
I've added an code example below. How do I use the X-Forwarded-For instead of self.client_address?
import time
import sys
import threading
from BaseHTTPServer import BaseHTTPRequestHandler,HTTPServer
from SocketServer import ThreadingMixIn
import urlparse
import json
from uuid import uuid4
from datetime import datetime
PORT_NUMBER = 8080
class myHandler(BaseHTTPRequestHandler):
def do_GET(self):
query_id = uuid4()
query = urlparse.parse_qs(urlparse.urlparse(self.path).query)
if not "q" in query or len(query["q"][0])==0:
self.send_error(404,'Query not found in %s' % self.path)
return
text = query["q"][0]
client_ip = self.client_address[0]
print("QUERY FROM {}: {}".format(client_ip, text))
class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
"""Handle requests in a separate thread."""
def main(_):
if not FLAGS.server:
print('please specify server host:port')
return
try:
server = ThreadedHTTPServer(('', PORT_NUMBER), myHandler)
print('Started httpserver on port %d' % PORT_NUMBER)
server.serve_forever()
except KeyboardInterrupt:
print('^C received, shutting down the web server')
server.socket.close()
I am trying to create multi threaded web server in python, but the requests are handled one by one. After searching few hours, I found this link but the approved answer seems to be incorrect as the request over there is also handled one by one.
Here is the code:
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
from SocketServer import ThreadingMixIn
import threading
from time import sleep
class Handler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.end_headers()
sleep(5)
message = threading.currentThread().getName()
self.wfile.write(message)
self.wfile.write('\n')
return
class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
"""Handle requests in a separate thread."""
if __name__ == '__main__':
server = ThreadedHTTPServer(('localhost', 8080), Handler)
print 'Starting server, use <Ctrl-C> to stop'
server.serve_forever()
I added "sleep(5)" for 5 second delay to handle the request. After that I send multiple requests but all the requests are handled one by one and each request took 5 seconds. I am unable to find the reason. Help me.
The key requirement here is to be able to have a 5-second delay between the send_response and the data returned. That means you need streaming; you can't use ThreadingMixIn, gunicorn, or any other such hack.
You need something like this:
import time, socket, threading
sock = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
port = 8000
sock.bind((host, port))
sock.listen(1)
HTTP = "HTTP/1.1 200 OK\nContent-Type: text/html; charset=UTF-8\n\n"
class Listener(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.daemon = True # stop Python from biting ctrl-C
self.start()
def run(self):
conn, addr = sock.accept()
conn.send(HTTP)
# serve up an infinite stream
i = 0
while True:
conn.send("%i " % i)
time.sleep(0.1)
i += 1
[Listener() for i in range(100)]
time.sleep(9e9)
I am using BaseHTTPServer to serve a simple variable, the problem is that the rest after server.serve_forever() is not executing.
It does not seem that BaseHTTPServer is forking?
How can i get around this problem?
The variable (http output) BaseHTTPServer is serving is continiously updated by the other part of the script.
Here is a pastebin: http://pastebin.com/v4xEuHBs
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
import SocketServer
import os
def main():
try:
startserver(self)
def startserver(self):
newpid = os.fork()
if newpid == 0:
server = HTTPServer(('',8080), ThreadingHTTPServer)
server.serve_forever()
class ThreadingHTTPServer(SocketServer.ThreadingMixIn,BaseHTTPRequestHandler):
def do_GET(self):
self.loop = loop
self.send_response(200)
self.send_header('Content-type','text/html')
self.end_headers()
self.wfile.write('hello, world')
return