287 lines
9.1 KiB
Python
287 lines
9.1 KiB
Python
##########################################################
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# This RNS example demonstrates how to set perform #
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# requests and receive responses over a link. #
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##########################################################
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import os
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import sys
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import time
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import random
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import argparse
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import RNS
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# Let's define an app name. We'll use this for all
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# destinations we create. Since this echo example
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# is part of a range of example utilities, we'll put
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# them all within the app namespace "example_utilities"
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APP_NAME = "example_utilities"
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##########################################################
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#### Server Part #########################################
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##########################################################
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# A reference to the latest client link that connected
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latest_client_link = None
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def random_text_generator(path, data, request_id, link_id, remote_identity, requested_at):
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RNS.log("Generating response to request "+RNS.prettyhexrep(request_id)+" on link "+RNS.prettyhexrep(link_id))
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texts = ["They looked up", "On each full moon", "Becky was upset", "I’ll stay away from it", "The pet shop stocks everything"]
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return texts[random.randint(0, len(texts)-1)]
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# This initialisation is executed when the users chooses
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# to run as a server
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def server(configpath):
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# We must first initialise Reticulum
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reticulum = RNS.Reticulum(configpath)
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# Randomly create a new identity for our link example
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server_identity = RNS.Identity()
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# We create a destination that clients can connect to. We
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# want clients to create links to this destination, so we
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# need to create a "single" destination type.
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server_destination = RNS.Destination(
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server_identity,
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RNS.Destination.IN,
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RNS.Destination.SINGLE,
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APP_NAME,
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"requestexample"
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)
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# We configure a function that will get called every time
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# a new client creates a link to this destination.
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server_destination.set_link_established_callback(client_connected)
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# We register a request handler for handling incoming
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# requests over any established links.
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server_destination.register_request_handler(
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"/random/text",
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response_generator = random_text_generator,
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allow = RNS.Destination.ALLOW_ALL
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)
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# Everything's ready!
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# Let's Wait for client requests or user input
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server_loop(server_destination)
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def server_loop(destination):
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# Let the user know that everything is ready
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RNS.log(
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"Request example "+
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RNS.prettyhexrep(destination.hash)+
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" running, waiting for a connection."
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)
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RNS.log("Hit enter to manually send an announce (Ctrl-C to quit)")
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# We enter a loop that runs until the users exits.
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# If the user hits enter, we will announce our server
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# destination on the network, which will let clients
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# know how to create messages directed towards it.
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while True:
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entered = input()
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destination.announce()
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RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
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# When a client establishes a link to our server
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# destination, this function will be called with
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# a reference to the link.
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def client_connected(link):
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global latest_client_link
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RNS.log("Client connected")
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link.set_link_closed_callback(client_disconnected)
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latest_client_link = link
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def client_disconnected(link):
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RNS.log("Client disconnected")
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##########################################################
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#### Client Part #########################################
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##########################################################
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# A reference to the server link
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server_link = None
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# This initialisation is executed when the users chooses
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# to run as a client
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def client(destination_hexhash, configpath):
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# We need a binary representation of the destination
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# hash that was entered on the command line
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try:
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dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
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if len(destination_hexhash) != dest_len:
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raise ValueError(
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"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
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)
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destination_hash = bytes.fromhex(destination_hexhash)
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except:
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RNS.log("Invalid destination entered. Check your input!\n")
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exit()
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# We must first initialise Reticulum
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reticulum = RNS.Reticulum(configpath)
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# Check if we know a path to the destination
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if not RNS.Transport.has_path(destination_hash):
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RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
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RNS.Transport.request_path(destination_hash)
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while not RNS.Transport.has_path(destination_hash):
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time.sleep(0.1)
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# Recall the server identity
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server_identity = RNS.Identity.recall(destination_hash)
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# Inform the user that we'll begin connecting
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RNS.log("Establishing link with server...")
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# When the server identity is known, we set
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# up a destination
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server_destination = RNS.Destination(
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server_identity,
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RNS.Destination.OUT,
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RNS.Destination.SINGLE,
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APP_NAME,
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"requestexample"
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)
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# And create a link
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link = RNS.Link(server_destination)
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# We'll set up functions to inform the
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# user when the link is established or closed
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link.set_link_established_callback(link_established)
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link.set_link_closed_callback(link_closed)
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# Everything is set up, so let's enter a loop
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# for the user to interact with the example
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client_loop()
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def client_loop():
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global server_link
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# Wait for the link to become active
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while not server_link:
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time.sleep(0.1)
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should_quit = False
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while not should_quit:
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try:
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print("> ", end=" ")
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text = input()
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# Check if we should quit the example
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if text == "quit" or text == "q" or text == "exit":
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should_quit = True
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server_link.teardown()
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else:
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server_link.request(
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"/random/text",
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data = None,
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response_callback = got_response,
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failed_callback = request_failed
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)
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except Exception as e:
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RNS.log("Error while sending request over the link: "+str(e))
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should_quit = True
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server_link.teardown()
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def got_response(request_receipt):
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request_id = request_receipt.request_id
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response = request_receipt.response
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RNS.log("Got response for request "+RNS.prettyhexrep(request_id)+": "+str(response))
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def request_received(request_receipt):
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RNS.log("The request "+RNS.prettyhexrep(request_receipt.request_id)+" was received by the remote peer.")
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def request_failed(request_receipt):
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RNS.log("The request "+RNS.prettyhexrep(request_receipt.request_id)+" failed.")
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# This function is called when a link
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# has been established with the server
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def link_established(link):
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# We store a reference to the link
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# instance for later use
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global server_link
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server_link = link
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# Inform the user that the server is
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# connected
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RNS.log("Link established with server, hit enter to perform a request, or type in \"quit\" to quit")
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# When a link is closed, we'll inform the
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# user, and exit the program
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def link_closed(link):
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if link.teardown_reason == RNS.Link.TIMEOUT:
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RNS.log("The link timed out, exiting now")
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elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
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RNS.log("The link was closed by the server, exiting now")
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else:
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RNS.log("Link closed, exiting now")
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RNS.Reticulum.exit_handler()
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time.sleep(1.5)
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os._exit(0)
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##########################################################
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#### Program Startup #####################################
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##########################################################
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# This part of the program runs at startup,
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# and parses input of from the user, and then
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# starts up the desired program mode.
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if __name__ == "__main__":
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try:
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parser = argparse.ArgumentParser(description="Simple request/response example")
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parser.add_argument(
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"-s",
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"--server",
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action="store_true",
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help="wait for incoming requests from clients"
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)
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parser.add_argument(
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"--config",
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action="store",
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default=None,
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help="path to alternative Reticulum config directory",
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type=str
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)
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parser.add_argument(
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"destination",
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nargs="?",
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default=None,
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help="hexadecimal hash of the server destination",
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type=str
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)
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args = parser.parse_args()
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if args.config:
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configarg = args.config
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else:
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configarg = None
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if args.server:
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server(configarg)
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else:
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if (args.destination == None):
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print("")
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parser.print_help()
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print("")
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else:
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client(args.destination, configarg)
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except KeyboardInterrupt:
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print("")
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exit() |