File transfer example
This commit is contained in:
Mark Qvist
parent
d69f3c2c34
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##########################################################
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# This RNS example demonstrates a simple filetransfer #
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# server and client program. The server will serve a #
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# directory of files, and the clients can list and #
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# download files from the server. #
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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 threading
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import argparse
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import RNS
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import RNS.vendor.umsgpack as 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_utilitites"
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# We'll also define a default timeout, in seconds
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APP_TIMEOUT = 5.0
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##########################################################
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#### Server Part #########################################
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##########################################################
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serve_path = 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, path):
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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 file server
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server_identity = RNS.Identity()
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global serve_path
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serve_path = path
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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(server_identity, RNS.Destination.IN, RNS.Destination.SINGLE, APP_NAME, "filetransfer", "server")
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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.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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announceLoop(server_destination)
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def announceLoop(destination):
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# Let the user know that everything is ready
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RNS.log("File server "+RNS.prettyhexrep(destination.hash)+" running, 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 = raw_input()
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destination.announce()
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RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
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# Here's a convenience function for listing all files
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# in our served directory
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def list_files():
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# We add all entries from the directory that are
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# actual files, and does not start with "."
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global serve_path
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return [file for file in os.listdir(serve_path) if os.path.isfile(os.path.join(serve_path, file)) and file[:1] != "."]
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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. We then send the client
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# a list of files hosted on the server.
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def client_connected(link):
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# Check if the served directory still exists
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if os.path.isdir(serve_path):
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RNS.log("Client connected, sending file list...")
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# We pack a list of files for sending in a packet
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data = umsgpack.packb(list_files())
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# Check the size of the packed data
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if len(data) <= RNS.Resource.SDU:
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# If it fits in one packet, we will just
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# send it as a single packet over the link.
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list_packet = RNS.Packet(link, data)
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list_receipt = list_packet.send()
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list_receipt.set_timeout(APP_TIMEOUT)
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list_receipt.delivery_callback(list_delivered)
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list_receipt.timeout_callback(list_timeout)
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else:
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RNS.log("Too many files in served directory!", RNS.LOG_ERROR)
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RNS.log("You should implement a function to split the filelist over multiple packets.", RNS.LOG_ERROR)
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RNS.log("Hint: The client already supports it :)", RNS.LOG_ERROR)
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# After this, we're just going to keep the link
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# open until the client requests a file. We'll
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# configure a function that get's called when
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# the client sends a packet with a file request.
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link.packet_callback(client_request)
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else:
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RNS.log("Client connected, but served path no longer exists!", RNS.LOG_ERROR)
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link.teardown()
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def client_request(message, packet):
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global serve_path
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if message in list_files():
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try:
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# If we have the requested file, we'll
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# read it and packe it as a resource
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RNS.log("Client requested \""+message+"\"")
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file = open(os.path.join(serve_path, message), "r")
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file_resource = RNS.Resource(file.read(), packet.link, callback=resource_sending_concluded)
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file_resource.filename = message
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except:
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# If somethign went wrong, we close
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# the link
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RNS.log("Error while reading file \""+message+"\"", RNS.LOG_ERROR)
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packet.link.teardown()
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else:
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# If we don't have it, we close the link
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RNS.log("Client requested an unknown file")
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packet.link.teardown()
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# This function is called on the server when a
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# resource transfer concludes.
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def resource_sending_concluded(resource):
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if resource.status == RNS.Resource.COMPLETE:
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RNS.log("Done sending \""+resource.filename+"\" to client")
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elif resource.status == RNS.Resource.FAILED:
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RNS.log("Sending \""+resource.filename+"\" to client failed")
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def list_delivered(receipt):
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RNS.log("The file list was received by the client")
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def list_timeout(receipt):
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RNS.log("Sending list to client timed out, closing this link")
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link = receipt.destination
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link.teardown()
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##########################################################
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#### Client Part #########################################
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##########################################################
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# We store a global list of files available on the server
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server_files = []
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# A reference to the server link
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server_link = None
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# And a reference to the current download
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current_download = None
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current_filename = 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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if len(destination_hexhash) != 20:
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raise ValueError("Destination length is invalid, must be 20 hexadecimal characters (10 bytes)")
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destination_hash = destination_hexhash.decode("hex")
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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 already know the destination
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server_identity = RNS.Identity.recall(destination_hash)
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# If not, we'll have to wait until an announce arrives
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if server_identity == None:
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RNS.log("Destination is not yet known, waiting for an announce to arrive... (Ctrl-C to cancel)")
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while (server_identity == None):
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time.sleep(0.1)
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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(server_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "filetransfer", "server")
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# We also want to automatically prove incoming packets
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server_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
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# And create a link
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link = RNS.Link(server_destination)
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# We expect any normal data packets on the link
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# to contain a list of served files, so we set
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# a callback accordingly
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link.packet_callback(filelist_received)
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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.link_established_callback(link_established)
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link.link_closed_callback(link_closed)
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# And set the link to automatically begin
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# downloading advertised resources
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link.set_resource_strategy(RNS.Link.ACCEPT_ALL)
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link.resource_started_callback(download_began)
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link.resource_concluded_callback(download_concluded)
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menu()
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# Requests the specified file from the server
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def download(filename):
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global server_link, menu_mode, current_filename
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current_filename = filename
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# We just create a packet containing the
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# requested filename, and send it down the
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# link.
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request_packet = RNS.Packet(server_link, filename)
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request_packet.send()
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print("")
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print("Requested \""+filename+"\" from server, waiting for download to begin...")
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menu_mode = "download_started"
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# This function runs a simple menu for the user
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# to select which files to download, or quit
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menu_mode = None
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def menu():
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global server_files
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# Wait until we have a filelist
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while len(server_files) == 0:
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time.sleep(0.1)
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RNS.log("Ready!")
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time.sleep(0.5)
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global menu_mode
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menu_mode = "main"
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should_quit = False
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while (not should_quit):
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print_menu()
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while not menu_mode == "main":
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# Wait
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time.sleep(0.25)
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user_input = raw_input()
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if user_input == "q" or user_input == "quit" or user_input == "exit":
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should_quit = True
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print("")
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else:
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if user_input in server_files:
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download(user_input)
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else:
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try:
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if 0 <= int(user_input) < len(server_files):
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download(server_files[int(user_input)])
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except:
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pass
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# Prints out menus or screens for the
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# various states of the client program.
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# It's simple and quite uninteresting.
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# I won't go into detail here. Just
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# strings basically.
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def print_menu():
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global menu_mode
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if menu_mode == "main":
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clear_screen()
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print_filelist()
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print("")
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print("Select a file to download by entering name or number, or q to quit")
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print("> "),
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elif menu_mode == "download_started":
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download_began = time.time()
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while menu_mode == "download_started":
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time.sleep(0.1)
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if time.time() > download_began+APP_TIMEOUT:
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print("The download timed out")
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time.sleep(1)
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menu_mode = "main"
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print_menu()
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if menu_mode == "downloading":
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print("Download started")
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print("")
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while menu_mode == "downloading":
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global current_download
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percent = round(current_download.progress() * 100.0, 1)
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print("\rProgress: "+str(percent)+" % "),
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sys.stdout.flush()
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time.sleep(0.1)
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if menu_mode == "save_error":
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print("\rProgress: 100.0 %"),
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sys.stdout.flush()
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print("")
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print("Could not write downloaded file to disk")
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current_download.status = RNS.Resource.FAILED
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menu_mode = "download_concluded"
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if menu_mode == "download_concluded":
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if current_download.status == RNS.Resource.COMPLETE:
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print("\rProgress: 100.0 %"),
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sys.stdout.flush()
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print("")
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print("The download completed!")
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else:
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print("")
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print("The download failed!")
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time.sleep(1)
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current_download = None
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menu_mode = "main"
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print_menu()
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# This function prints out a list of files
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# on the connected server.
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def print_filelist():
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global server_files
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print("Files on server:")
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for index,file in enumerate(server_files):
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print("\t("+str(index)+")\t"+file)
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def filelist_received(filelist_data, packet):
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global server_files, menu_mode
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try:
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# Unpack the list and extend our
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# local list of available files
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filelist = umsgpack.unpackb(filelist_data)
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for file in filelist:
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if not file in server_files:
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server_files.append(file)
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# If the menu is already visible,
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# we'll update it with what was
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# just received
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if menu_mode == "main":
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print_menu()
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except:
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RNS.log("Invalid file list data received, closing link")
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packet.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
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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")
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RNS.log("Waiting for filelist...")
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# And set up a small job to check for
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# a potential timeout in receiving the
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# file list
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thread = threading.Thread(target=filelist_timeout_job)
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thread.setDaemon(True)
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thread.start()
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# This job just sleeps for the specified
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# time, and then checks if the file list
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# was received. If not, the program will
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# exit.
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def filelist_timeout_job():
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time.sleep(APP_TIMEOUT)
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global server_files
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if len(server_files) == 0:
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RNS.log("Timed out waiting for filelist, exiting")
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os._exit(0)
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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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os._exit(0)
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# When RNS detects that the download has
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# started, we'll update our menu state
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# so the user can be shown a progress of
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# the download.
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def download_began(resource):
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global menu_mode, current_download
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current_download = resource
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menu_mode = "downloading"
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# When the download concludes, successfully
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# or not, we'll update our menu state and
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# inform the user about how it all went.
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def download_concluded(resource):
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global menu_mode, current_filename
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saved_filename = current_filename
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counter = 0
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while os.path.isfile(saved_filename):
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counter += 1
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saved_filename = current_filename+"."+str(counter)
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try:
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file = open(saved_filename, "w")
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file.write(resource.data)
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file.close()
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menu_mode = "download_concluded"
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except:
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menu_mode = "save_error"
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# A convenience function for clearing the screen
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def clear_screen():
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os.system('cls' if os.name=='nt' else 'clear')
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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 file transfer server and client utility")
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parser.add_argument("-s", "--serve", action="store", metavar="dir", help="serve a directory of files to clients")
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parser.add_argument("--config", action="store", default=None, help="path to alternative Reticulum config directory", type=str)
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parser.add_argument("destination", nargs="?", default=None, help="hexadecimal hash of the server destination", type=str)
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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.serve:
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if os.path.isdir(args.serve):
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server(configarg, args.serve)
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else:
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RNS.log("The specified directory does not exist")
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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()
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