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Reticulum/Examples/Filetransfer.py
Pavol Rusnak ecd5460e7f
remove dangling spaces
2024-10-07 10:52:43 +02:00

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Python
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##########################################################
# This RNS example demonstrates a simple filetransfer #
# server and client program. The server will serve a #
# directory of files, and the clients can list and #
# download files from the server. #
# #
# Please note that using RNS Resources for large file #
# transfers is not recommended, since compression, #
# encryption and hashmap sequencing can take a long time #
# on systems with slow CPUs, which will probably result #
# in the client timing out before the resource sender #
# can complete preparing the resource. #
# #
# If you need to transfer large files, use the Bundle #
# class instead, which will automatically slice the data #
# into chunks suitable for packing as a Resource. #
##########################################################
import os
import sys
import time
import threading
import argparse
import RNS
import RNS.vendor.umsgpack as umsgpack
# Let's define an app name. We'll use this for all
# destinations we create. Since this echo 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'll also define a default timeout, in seconds
APP_TIMEOUT = 45.0
##########################################################
#### Server Part #########################################
##########################################################
serve_path = None
# This initialisation is executed when the users chooses
# to run as a server
def server(configpath, path):
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Randomly create a new identity for our file server
server_identity = RNS.Identity()
global serve_path
serve_path = path
# We create a destination that clients can connect to. We
# want clients to create links to this destination, so we
# need to create a "single" destination type.
server_destination = RNS.Destination(
server_identity,
RNS.Destination.IN,
RNS.Destination.SINGLE,
APP_NAME,
"filetransfer",
"server"
)
# We configure a function that will get called every time
# a new client creates a link to this destination.
server_destination.set_link_established_callback(client_connected)
# Everything's ready!
# Let's Wait for client requests or user input
announceLoop(server_destination)
def announceLoop(destination):
# Let the user know that everything is ready
RNS.log(f"File server {RNS.prettyhexrep(destination.hash)} running")
RNS.log("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()
destination.announce()
RNS.log(f"Sent announce from {RNS.prettyhexrep(destination.hash)}")
# Here's a convenience function for listing all files
# in our served directory
def list_files():
# We add all entries from the directory that are
# actual files, and does not start with "."
global serve_path
return [file for file in os.listdir(serve_path) if os.path.isfile(os.path.join(serve_path, file)) and file[:1] != "."]
# When a client establishes a link to our server
# destination, this function will be called with
# a reference to the link. We then send the client
# a list of files hosted on the server.
def client_connected(link):
# Check if the served directory still exists
if os.path.isdir(serve_path):
RNS.log("Client connected, sending file list...")
link.set_link_closed_callback(client_disconnected)
# We pack a list of files for sending in a packet
data = umsgpack.packb(list_files())
# Check the size of the packed data
if len(data) <= RNS.Link.MDU:
# If it fits in one packet, we will just
# send it as a single packet over the link.
list_packet = RNS.Packet(link, data)
list_receipt = list_packet.send()
list_receipt.set_timeout(APP_TIMEOUT)
list_receipt.set_delivery_callback(list_delivered)
list_receipt.set_timeout_callback(list_timeout)
else:
RNS.log("Too many files in served directory!", RNS.LOG_ERROR)
RNS.log("You should implement a function to split the filelist over multiple packets.", RNS.LOG_ERROR)
RNS.log("Hint: The client already supports it :)", RNS.LOG_ERROR)
# After this, we're just going to keep the link
# open until the client requests a file. We'll
# configure a function that get's called when
# the client sends a packet with a file request.
link.set_packet_callback(client_request)
else:
RNS.log("Client connected, but served path no longer exists!", RNS.LOG_ERROR)
link.teardown()
def client_disconnected(link):
RNS.log("Client disconnected")
def client_request(message, packet):
global serve_path
try:
filename = message.decode("utf-8")
except Exception as e:
filename = None
if filename in list_files():
try:
# If we have the requested file, we'll
# read it and pack it as a resource
RNS.log(f"Client requested \"{filename}\"")
file = open(os.path.join(serve_path, filename), "rb")
file_resource = RNS.Resource(
file,
packet.link,
callback=resource_sending_concluded
)
file_resource.filename = filename
except Exception as e:
# If somethign went wrong, we close
# the link
RNS.log(f"Error while reading file \"{filename}\"", RNS.LOG_ERROR)
packet.link.teardown()
raise e
else:
# If we don't have it, we close the link
RNS.log("Client requested an unknown file")
packet.link.teardown()
# This function is called on the server when a
# resource transfer concludes.
def resource_sending_concluded(resource):
if hasattr(resource, "filename"):
name = resource.filename
else:
name = "resource"
if resource.status == RNS.Resource.COMPLETE:
RNS.log(f"Done sending \"{name}\" to client")
elif resource.status == RNS.Resource.FAILED:
RNS.log(f"Sending \"{name}\" to client failed")
def list_delivered(receipt):
RNS.log("The file list was received by the client")
def list_timeout(receipt):
RNS.log("Sending list to client timed out, closing this link")
link = receipt.destination
link.teardown()
##########################################################
#### Client Part #########################################
##########################################################
# We store a global list of files available on the server
server_files = []
# A reference to the server link
server_link = None
# And a reference to the current download
current_download = None
current_filename = None
# Variables to store download statistics
download_started = 0
download_finished = 0
download_time = 0
transfer_size = 0
file_size = 0
# This initialisation is executed when the users chooses
# to run as a client
def client(destination_hexhash, configpath):
# We need a binary representation of the destination
# hash that was entered on the command line
try:
dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
if len(destination_hexhash) != dest_len:
raise ValueError(
f"Destination length is invalid, must be {dest_len} hexadecimal characters ({dest_len // 2} bytes)."
)
destination_hash = bytes.fromhex(destination_hexhash)
except:
RNS.log("Invalid destination entered. Check your input!\n")
exit()
# We must first initialise Reticulum
reticulum = RNS.Reticulum(configpath)
# Check if we know a path to the destination
if not RNS.Transport.has_path(destination_hash):
RNS.log("Destination is not yet known. Requesting path and waiting for announce to arrive...")
RNS.Transport.request_path(destination_hash)
while not RNS.Transport.has_path(destination_hash):
time.sleep(0.1)
# Recall the server identity
server_identity = RNS.Identity.recall(destination_hash)
# Inform the user that we'll begin connecting
RNS.log("Establishing link with server...")
# When the server identity is known, we set
# up a destination
server_destination = RNS.Destination(
server_identity,
RNS.Destination.OUT,
RNS.Destination.SINGLE,
APP_NAME,
"filetransfer",
"server"
)
# We also want to automatically prove incoming packets
server_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
# And create a link
link = RNS.Link(server_destination)
# We expect any normal data packets on the link
# to contain a list of served files, so we set
# a callback accordingly
link.set_packet_callback(filelist_received)
# We'll also set up functions to inform the
# user when the link is established or closed
link.set_link_established_callback(link_established)
link.set_link_closed_callback(link_closed)
# And set the link to automatically begin
# downloading advertised resources
link.set_resource_strategy(RNS.Link.ACCEPT_ALL)
link.set_resource_started_callback(download_began)
link.set_resource_concluded_callback(download_concluded)
menu()
# Requests the specified file from the server
def download(filename):
global server_link, menu_mode, current_filename, transfer_size, download_started
current_filename = filename
download_started = 0
transfer_size = 0
# We just create a packet containing the
# requested filename, and send it down the
# link. We also specify we don't need a
# packet receipt.
request_packet = RNS.Packet(server_link, filename.encode("utf-8"), create_receipt=False)
request_packet.send()
print("")
print(f"Requested \"{filename}\" from server, waiting for download to begin...")
menu_mode = "download_started"
# This function runs a simple menu for the user
# to select which files to download, or quit
menu_mode = None
def menu():
global server_files, server_link
# Wait until we have a filelist
while len(server_files) == 0:
time.sleep(0.1)
RNS.log("Ready!")
time.sleep(0.5)
global menu_mode
menu_mode = "main"
should_quit = False
while (not should_quit):
print_menu()
while not menu_mode == "main":
# Wait
time.sleep(0.25)
user_input = input()
if user_input == "q" or user_input == "quit" or user_input == "exit":
should_quit = True
print("")
else:
if user_input in server_files:
download(user_input)
else:
try:
if 0 <= int(user_input) < len(server_files):
download(server_files[int(user_input)])
except:
pass
if should_quit:
server_link.teardown()
# Prints out menus or screens for the
# various states of the client program.
# It's simple and quite uninteresting.
# I won't go into detail here. Just
# strings basically.
def print_menu():
global menu_mode, download_time, download_started, download_finished, transfer_size, file_size
if menu_mode == "main":
clear_screen()
print_filelist()
print("")
print("Select a file to download by entering name or number, or q to quit")
print(("> "), end=' ')
elif menu_mode == "download_started":
download_began = time.time()
while menu_mode == "download_started":
time.sleep(0.1)
if time.time() > download_began+APP_TIMEOUT:
print("The download timed out")
time.sleep(1)
server_link.teardown()
if menu_mode == "downloading":
print("Download started")
print("")
while menu_mode == "downloading":
global current_download
percent = round(current_download.get_progress() * 100.0, 1)
print(f'\rProgress: {percent} % ', end=' ')
sys.stdout.flush()
time.sleep(0.1)
if menu_mode == "save_error":
print(("\rProgress: 100.0 %"), end=' ')
sys.stdout.flush()
print("")
print("Could not write downloaded file to disk")
current_download.status = RNS.Resource.FAILED
menu_mode = "download_concluded"
if menu_mode == "download_concluded":
if current_download.status == RNS.Resource.COMPLETE:
print(("\rProgress: 100.0 %"), end=' ')
sys.stdout.flush()
# Print statistics
hours, rem = divmod(download_time, 3600)
minutes, seconds = divmod(rem, 60)
timestring = f"{int(hours):0>2}:{int(minutes):0>2}:{seconds:05.2f}"
print("")
print("")
print("--- Statistics -----")
print(f"\tTime taken : {timestring}")
print(f"\tFile size : {size_str(file_size)}")
print(f"\tData transferred : {size_str(transfer_size)}")
print(f"\tEffective rate : {size_str(file_size / download_time, suffix='b')}/s")
print(f"\tTransfer rate : {size_str(transfer_size / download_time, suffix='b')}/s")
print("")
print("The download completed! Press enter to return to the menu.")
print("")
input()
else:
print("")
print("The download failed! Press enter to return to the menu.")
input()
current_download = None
menu_mode = "main"
print_menu()
# This function prints out a list of files
# on the connected server.
def print_filelist():
global server_files
print("Files on server:")
for index,file in enumerate(server_files):
print(f"\t({index})\t{file}")
def filelist_received(filelist_data, packet):
global server_files, menu_mode
try:
# Unpack the list and extend our
# local list of available files
filelist = umsgpack.unpackb(filelist_data)
for file in filelist:
if not file in server_files:
server_files.append(file)
# If the menu is already visible,
# we'll update it with what was
# just received
if menu_mode == "main":
print_menu()
except:
RNS.log("Invalid file list data received, closing link")
packet.link.teardown()
# This function is called when a link
# has been established with the server
def link_established(link):
# We store a reference to the link
# instance for later use
global server_link
server_link = link
# Inform the user that the server is
# connected
RNS.log("Link established with server")
RNS.log("Waiting for filelist...")
# And set up a small job to check for
# a potential timeout in receiving the
# file list
thread = threading.Thread(target=filelist_timeout_job, daemon=True)
thread.start()
# This job just sleeps for the specified
# time, and then checks if the file list
# was received. If not, the program will
# exit.
def filelist_timeout_job():
time.sleep(APP_TIMEOUT)
global server_files
if len(server_files) == 0:
RNS.log("Timed out waiting for filelist, exiting")
os._exit(0)
# When a link is closed, we'll inform the
# user, and exit the program
def link_closed(link):
if link.teardown_reason == RNS.Link.TIMEOUT:
RNS.log("The link timed out, exiting now")
elif link.teardown_reason == RNS.Link.DESTINATION_CLOSED:
RNS.log("The link was closed by the server, exiting now")
else:
RNS.log("Link closed, exiting now")
RNS.Reticulum.exit_handler()
time.sleep(1.5)
os._exit(0)
# When RNS detects that the download has
# started, we'll update our menu state
# so the user can be shown a progress of
# the download.
def download_began(resource):
global menu_mode, current_download, download_started, transfer_size, file_size
current_download = resource
if download_started == 0:
download_started = time.time()
transfer_size += resource.size
file_size = resource.total_size
menu_mode = "downloading"
# When the download concludes, successfully
# or not, we'll update our menu state and
# inform the user about how it all went.
def download_concluded(resource):
global menu_mode, current_filename, download_started, download_finished, download_time
download_finished = time.time()
download_time = download_finished - download_started
saved_filename = current_filename
if resource.status == RNS.Resource.COMPLETE:
counter = 0
while os.path.isfile(saved_filename):
counter += 1
saved_filename = f"{current_filename}.{counter}"
try:
file = open(saved_filename, "wb")
file.write(resource.data.read())
file.close()
menu_mode = "download_concluded"
except:
menu_mode = "save_error"
else:
menu_mode = "download_concluded"
# A convenience function for printing a human-
# readable file size
def size_str(num, suffix='B'):
units = ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']
last_unit = 'Yi'
if suffix == 'b':
num *= 8
units = ['','K','M','G','T','P','E','Z']
last_unit = 'Y'
for unit in units:
if abs(num) < 1024.0:
return f"{num:3.2f} {unit}{suffix}"
num /= 1024.0
return f"{num:.2f} {last_unit}{suffix}"
# A convenience function for clearing the screen
def clear_screen():
os.system('cls' if os.name=='nt' else 'clear')
##########################################################
#### Program Startup #####################################
##########################################################
# This part of the program runs at startup,
# and parses input of from the user, and then
# starts up the desired program mode.
if __name__ == "__main__":
try:
parser = argparse.ArgumentParser(
description="Simple file transfer server and client utility"
)
parser.add_argument(
"-s",
"--serve",
action="store",
metavar="dir",
help="serve a directory of files to clients"
)
parser.add_argument(
"--config",
action="store",
default=None,
help="path to alternative Reticulum config directory",
type=str
)
parser.add_argument(
"destination",
nargs="?",
default=None,
help="hexadecimal hash of the server destination",
type=str
)
args = parser.parse_args()
if args.config:
configarg = args.config
else:
configarg = None
if args.serve:
if os.path.isdir(args.serve):
server(configarg, args.serve)
else:
RNS.log("The specified directory does not exist")
else:
if (args.destination == None):
print("")
parser.print_help()
print("")
else:
client(args.destination, configarg)
except KeyboardInterrupt:
print("")
exit()
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