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client.py
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client.py
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"""async_client
Champlain College CSI-235, Spring 2018
Prof. Josh Auerbach
Bare bones example of asynchronously receiving
data from server and user input from stdin
Last modified by Alice Easter && Eric Cacciavillani on 4/26/18
"""
import json
import ssl
import struct
import time
import argparse
import asyncio
class AsyncClient(asyncio.Protocol):
def __init__(self):
self.__buffer = ""
self.is_logged_in = False
self.username = ""
self.data_len = 0
def connection_made(self, transport):
self.transport = transport
self.is_logged_in = False
# Client sends message
def send_message(self, data):
msg = b''
msg += struct.pack("!I", len(data))
msg += data
self.transport.write(msg)
# Handles the client reciving data
def data_received(self, data):
"""simply prints any data that is received"""
# Get data into usable format
if self.__buffer == '':
# Find first brace and offset the data by that
brace_index = data.find(b'{')
self.data_len = struct.unpack("!I", data[0:brace_index])[0]
data = data[brace_index:(self.data_len + brace_index)]
data = data.decode('ascii')
self.__buffer += data
# Buffer contains full message
if len(self.__buffer) == self.data_len:
# Extract to JSON object
data = json.loads(self.__buffer)
# Clear pre and post
self.__buffer = ''
self.data_len = 0
# Iterate through JSON keys
for key in data:
# Check json key value
if key == "USERNAME_ACCEPTED":
if data[key]:
self.is_logged_in = True
print('\nSuccessfully Logged In')
# ----
elif key == "INFO":
print(data[key])
print()
# ----
elif key == "USER_LIST":
print("USERS ONLINE:")
for user in data[key]:
if user["name"] is not '' and user["active"]:
print(user["name"])
print()
# ----
elif key == "MESSAGES":
for message in data[key]:
# Ensure message is designated for set user
if message[1] == "ALL" or message[1] == self.username:
# Convert time seconds to UTC time for prefix of recived message
time_prefix = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(message[2]))
# Main display for all given output from the server
if message[0] == self.username:
print("[{}] \033[36m{}\033[0m : {}".format(time_prefix,message[0],message[3]))
else:
print("[{}] \033[35m{}\033[0m : {}".format(time_prefix,message[0],message[3]))
elif key == "USERS_JOINED":
print("New User(s) Joined:")
for user in data[key]:
print(user)
print()
elif key == "USERS_LEFT":
print("User(s) Left:")
for user in data[key]:
print(user)
print()
# Encapsulates error and other servers' additional features
else:
# If we get something we aren't expecting, print it
print("UNEXPECTED RESP FROM SERVER" + key + ": " + data[key])
# When the client is disconnected from the server
def connection_lost(self, exc):
print('Connection to server lost')
print('(Press RET to exit)')
self.is_logged_in = False
loop.run_in_executor(None, input, "")
exit(0)
@asyncio.coroutine
def handle_user_input(loop, client):
"""reads from stdin in separate thread
if user inputs 'quit' stops the event loop
otherwise just echos user input
"""
# When new/unknown user joins
while not client.is_logged_in:
# Set up JSON login message with dictionary
login_data = {"USERNAME": ""}
# ---
message = yield from loop.run_in_executor(None, input, "> Enter your username: ")
if message == "/Quit":
loop.stop()
return
# Use username in login dictionary to convert
client.username = message
login_data["USERNAME"] = message
data_json = json.dumps(login_data)
data_bytes_json = data_json.encode('ascii')
# Send message to server
client.send_message(data_bytes_json)
# Give server one second delay to push data to it
yield from asyncio.sleep(1)
if not client.is_logged_in:
print("This user has already been signed into the current server session!!!")
# When user is known and logged into the server
while client.is_logged_in:
recip = "ALL"
message = yield from loop.run_in_executor(None, input, "> ")
# Checking for DM
if len(message) != 0 and message[0] == '@':
index = message.find(' ')
recip = message[1:index]
message = message[index + 1:]
# Checking for command
elif len(message) != 0 and message[0] == '/':
if message == '/Quit':
loop.stop()
return
elif message == '/Help':
print('Chatterbox: The Chat Client You Never Knew You Didn\'t Need')
print('---')
print('Commands:')
print('/Block <username> - blocks messages to and from the specified username')
print('/Blocked - display a list of all users whom the client has blocked')
print('/DisplayAllUsers - display all users whom have ever been active')
print('/DisplayUsers - dispaly all currently active users')
print('/Help - display all supported commands')
print('/Name - display current user\'s username')
print('/Unblock <username> - unblocks messages from the specified username. Note that if the unblocked user has blocked the current client, messages still cannot be sent between the two clients')
print('/Quit - quits the application')
print('')
continue
else:
recip = client.username
# Format message object to be encoded and JSONified
message = {"MESSAGES": [(client.username, recip, int(time.time()), message)]}
message = json.dumps(message)
message = message.encode('ascii')
client.send_message(message)
# Give server one second delay to push data to it
yield from asyncio.sleep(1)
return
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Example client')
parser.add_argument('host', help='IP or hostname')
parser.add_argument('-p', metavar='port', type=int, default=9000,
help='TCP port (default 9000)')
parser.add_argument('-ca', dest='cafile', metavar='cafile', type=str, default=None,
help='CA File')
args = parser.parse_args()
loop = asyncio.get_event_loop()
# we only need one client instance
client = AsyncClient()
# the lambda client serves as a factory that just returns
# the client instance we just created
purpose = ssl.Purpose.SERVER_AUTH
context = ssl.create_default_context(purpose, cafile=args.cafile)
server_name = args.host
if args.cafile is not None:
server_name = 'localhost'
coro = loop.create_connection(lambda: client, host=args.host, port=args.p, ssl=context, server_hostname=server_name)
loop.run_until_complete(coro)
# Start a task which reads from standard input
asyncio.async(handle_user_input(loop, client))
try:
loop.run_forever()
finally:
loop.close()