323 lines
10 KiB
Python
323 lines
10 KiB
Python
##########################################################
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# This RNS example demonstrates how to set up a link to #
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# a destination, and pass binary data over it using a #
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# channel buffer. #
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##########################################################
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from __future__ import annotations
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import os
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import sys
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import time
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import argparse
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from datetime import datetime
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import RNS
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from RNS.vendor import umsgpack
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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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# A reference to the latest buffer object
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latest_buffer = None
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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 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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"bufferexample"
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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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# 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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"Link buffer 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, latest_buffer
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latest_client_link = link
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RNS.log("Client connected")
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link.set_link_closed_callback(client_disconnected)
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# If a new connection is received, the old reader
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# needs to be disconnected.
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if latest_buffer:
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latest_buffer.close()
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# Create buffer objects.
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# The stream_id parameter to these functions is
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# a bit like a file descriptor, except that it
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# is unique to the *receiver*.
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#
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# In this example, both the reader and the writer
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# use stream_id = 0, but there are actually two
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# separate unidirectional streams flowing in
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# opposite directions.
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#
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channel = link.get_channel()
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latest_buffer = RNS.Buffer.create_bidirectional_buffer(0, 0, channel, server_buffer_ready)
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def client_disconnected(link):
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RNS.log("Client disconnected")
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def server_buffer_ready(ready_bytes: int):
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"""
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Callback from buffer when buffer has data available
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:param ready_bytes: The number of bytes ready to read
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"""
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global latest_buffer
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data = latest_buffer.read(ready_bytes)
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data = data.decode("utf-8")
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RNS.log("Received data over the buffer: " + data)
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reply_message = "I received \""+data+"\" over the buffer"
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reply_message = reply_message.encode("utf-8")
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latest_buffer.write(reply_message)
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latest_buffer.flush()
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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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# A reference to the buffer object, needed to share the
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# object from the link connected callback to the client
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# loop.
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buffer = 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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"bufferexample"
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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 also 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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# Otherwise, encode the text and write it to the buffer.
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text = text.encode("utf-8")
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buffer.write(text)
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# Flush the buffer to force the data to be sent.
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buffer.flush()
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except Exception as e:
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RNS.log("Error while sending data over the link buffer: "+str(e))
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should_quit = True
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server_link.teardown()
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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, buffer
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server_link = link
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# Create buffer, see server_client_connected() for
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# more detail about setting up the buffer.
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channel = link.get_channel()
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buffer = RNS.Buffer.create_bidirectional_buffer(0, 0, channel, client_buffer_ready)
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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, enter some text to send, or \"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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# When the buffer has new data, read it and write it to the terminal.
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def client_buffer_ready(ready_bytes: int):
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global buffer
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data = buffer.read(ready_bytes)
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RNS.log("Received data over the link buffer: " + data.decode("utf-8"))
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print("> ", end=" ")
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sys.stdout.flush()
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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 buffer 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 link 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() |