Reticulum/Examples/Announce.py

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##########################################################
# This RNS example demonstrates setting up announce #
# callbacks, which will let an application receive a #
# notification when an announce relevant for it arrives #
##########################################################
import argparse
import random
import RNS
# Let's define an app name. We'll use this for all
# destinations we create. Since this basic example
# is part of a range of example utilities, we'll put
# them all within the app namespace "example_utilities"
APP_NAME = "example_utilities"
# We initialise two lists of strings to use as app_data
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fruits = ["Peach", "Quince", "Date", "Tangerine", "Pomelo", "Carambola", "Grape"]
noble_gases = ["Helium", "Neon", "Argon", "Krypton", "Xenon", "Radon", "Oganesson"]
# This initialisation is executed when the program is started
def program_setup(configpath):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our example
identity = RNS.Identity()
# Using the identity we just created, we create two destinations
# in the "example_utilities.announcesample" application space.
#
# Destinations are endpoints in Reticulum, that can be addressed
# and communicated with. Destinations can also announce their
# existence, which will let the network know they are reachable
# and autoomatically create paths to them, from anywhere else
# in the network.
destination_1 = RNS.Destination(
identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"announcesample",
"fruits"
)
destination_2 = RNS.Destination(
identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"announcesample",
"noble_gases"
)
# We configure the destinations to automatically prove all
# packets adressed to it. By doing this, RNS will automatically
# generate a proof for each incoming packet and transmit it
# back to the sender of that packet. This will let anyone that
# tries to communicate with the destination know whether their
# communication was received correctly.
destination_1.set_proof_strategy(RNS.Destination.PROVE_ALL)
destination_2.set_proof_strategy(RNS.Destination.PROVE_ALL)
# We create an announce handler and configure it to only ask for
# announces from "example_utilities.announcesample.fruits".
# Try changing the filter and see what happens.
announce_handler = ExampleAnnounceHandler(
aspect_filter="example_utilities.announcesample.fruits"
)
# We register the announce handler with Reticulum
RNS.Transport.register_announce_handler(announce_handler)
# Everything's ready!
# Let's hand over control to the announce loop
announceLoop(destination_1, destination_2)
def announceLoop(destination_1, destination_2):
# Let the user know that everything is ready
RNS.log("Announce example running, hit enter to manually send an announce (Ctrl-C to quit)")
# We enter a loop that runs until the users exits.
# If the user hits enter, we will announce our server
# destination on the network, which will let clients
# know how to create messages directed towards it.
while True:
entered = input()
# Randomly select a fruit
fruit = fruits[random.randint(0,len(fruits)-1)]
# Send the announce including the app data
destination_1.announce(app_data=fruit.encode("utf-8"))
RNS.log(
"Sent announce from "+
RNS.prettyhexrep(destination_1.hash)+
" ("+destination_1.name+")"
)
# Randomly select a noble gas
noble_gas = noble_gases[random.randint(0,len(noble_gases)-1)]
# Send the announce including the app data
destination_2.announce(app_data=noble_gas.encode("utf-8"))
RNS.log(
"Sent announce from "+
RNS.prettyhexrep(destination_2.hash)+
" ("+destination_2.name+")"
)
# We will need to define an announce handler class that
# Reticulum can message when an announce arrives.
class ExampleAnnounceHandler:
# The initialisation method takes the optional
# aspect_filter argument. If aspect_filter is set to
# None, all announces will be passed to the instance.
# If only some announces are wanted, it can be set to
# an aspect string.
def __init__(self, aspect_filter=None):
self.aspect_filter = aspect_filter
# This method will be called by Reticulums Transport
# system when an announce arrives that matches the
# configured aspect filter. Filters must be specific,
# and cannot use wildcards.
def received_announce(self, destination_hash, announced_identity, app_data):
RNS.log(
"Received an announce from "+
RNS.prettyhexrep(destination_hash)
)
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if app_data:
RNS.log(
"The announce contained the following app data: "+
app_data.decode("utf-8")
)
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program gets run at startup,
# and parses input from the user, and then starts
# the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(
description="Reticulum example that demonstrates announces and announce handlers"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
program_setup(configarg)
except KeyboardInterrupt:
print("")
exit()