Python HTTP server shared object for many requests

Question

I have a simple HTTP server

import http.server
import socketserver
import os
import threading
import time

from queue import Queue


PORT = 8005

class MyHttpRequestHandler(http.server.SimpleHTTPRequestHandler):
    def __init__(self, *args, directory=None, **kwargs):
        self.active_threads = []        
        super().__init__(*args, directory=None, **kwargs)

    def do_GET(self):
        person_ids = self.path[1:].split(',')
        print("Handle request", person_ids)
        print(f"active_threads_id, {id(self.active_threads)}")
        

# Create an object of the above class
handler_object = MyHttpRequestHandler
my_server = socketserver.TCPServer(("", PORT), handler_object)
# Star the server
my_server.serve_forever()

I want to have self.active_threads = [] as shared (single) object for all requests. But output shows that each request has it's own object. See output of the program

Handle request ['qwert2', 'qwert3']
active_threads_id, 140470238782272
Handle request ['qwert2', 'qwert3']
active_threads_id, 140470238809984
Handle request ['qwert2', 'qwert3']
active_threads_id, 140470238809280
Handle request ['qwert2', 'qwert3']
active_threads_id, 140470238782272

I want output like below:

Handle request ['qwert2', 'qwert3']
active_threads_id, 140470238782272 # the same id
Handle request ['qwert2', 'qwert3']
active_threads_id, 140470238782272 # the same id

Booboo · Accepted Answer · 2021-07-11 11:20:38Z

1

You can make active_threads a class attribute:

class MyHttpRequestHandler(http.server.SimpleHTTPRequestHandler):
    active_threads = []

    def __init__(self, *args, directory=None, **kwargs):
        super().__init__(*args, directory=None, **kwargs)

    def do_GET(self):
        person_ids = self.path[1:].split(',')
        print("Handle request", person_ids)
        print(f"active_threads_id, {id(self.active_threads)}")

Prints:

Handle request ['a', 'b']
active_threads_id, 1680095513280
Handle request ['a', 'b']
active_threads_id, 1680095513280
Handle request ['a', 'b']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
Handle request ['c', 'd']
active_threads_id, 1680095513280
. . . etc.

answered Jul 11, 2021 at 11:20

Booboo

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1 Comment

swor Over a year ago

Thank you for this solution

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