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client.py
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client.py
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import socket
import threading
import platform
import mimetypes
import os
import sys
import time
from pathlib import Path
class MyException(Exception):
pass
class Client(object):
def __init__(self, serverhost='localhost', V='P2P-CI/1.0', DIR='rfc'):
self.SERVER_HOST = serverhost
self.SERVER_PORT = 7734
self.V = V
self.DIR = 'rfc' # file directory
Path(self.DIR).mkdir(exist_ok=True)
self.UPLOAD_PORT = None
self.shareable = True
def start(self):
# connect to server
print('Connecting to the server %s:%s' %
(self.SERVER_HOST, self.SERVER_PORT))
self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
self.server.connect((self.SERVER_HOST, self.SERVER_PORT))
except Exception:
print('Server Not Available.')
return
print('Connected')
# upload
uploader_process = threading.Thread(target=self.init_upload)
uploader_process.start()
while self.UPLOAD_PORT is None:
# wait until upload port is initialized
pass
print('Listening on the upload port %s' % self.UPLOAD_PORT)
# interactive shell
self.cli()
def cli(self):
command_dict = {'1': self.add,
'2': self.lookup,
'3': self.listall,
'4': self.pre_download,
'5': self.shutdown}
while True:
try:
req = input('\n1: Add, 2: Look Up, 3: List All, 4: Download, 5: Shut Down\nEnter your request: ')
command_dict.setdefault(req, self.invalid_input)()
except MyException as e:
print(e)
except Exception:
print('System Error.')
except BaseException:
self.shutdown()
def init_upload(self):
# listen upload port
self.uploader = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.uploader.bind(('', 0))
self.UPLOAD_PORT = self.uploader.getsockname()[1]
self.uploader.listen(5)
while self.shareable:
requester, addr = self.uploader.accept()
handler = threading.Thread(
target=self.handle_upload, args=(requester, addr))
handler.start()
self.uploader.close()
def handle_upload(self, soc, addr):
header = soc.recv(1024).decode().splitlines()
try:
version = header[0].split()[-1]
num = header[0].split()[-2]
method = header[0].split()[0]
path = '%s/rfc%s.txt' % (self.DIR, num)
if version != self.V:
soc.sendall(str.encode(
self.V + ' 505 P2P-CI Version Not Supported\n'))
elif not Path(path).is_file():
soc.sendall(str.encode(self.V + ' 404 Not Found\n'))
elif method == 'GET':
header = self.V + ' 200 OK\n'
header += 'Data: %s\n' % (time.strftime(
"%a, %d %b %Y %H:%M:%S GMT", time.gmtime()))
header += 'OS: %s\n' % (platform.platform())
header += 'Last-Modified: %s\n' % (time.strftime(
"%a, %d %b %Y %H:%M:%S GMT", time.gmtime(os.path.getmtime(path))))
header += 'Content-Length: %s\n' % (os.path.getsize(path))
header += 'Content-Type: %s\n' % (
mimetypes.MimeTypes().guess_type(path)[0])
soc.sendall(header.encode())
# Uploading
try:
print('\nUploading...')
send_length = 0
with open(path, 'r') as file:
to_send = file.read(1024)
while to_send:
send_length += len(to_send.encode())
soc.sendall(to_send.encode())
to_send = file.read(1024)
except Exception:
raise MyException('Uploading Failed')
# total_length = int(os.path.getsize(path))
# print('send: %s | total: %s' % (send_length, total_length))
# if send_length < total_length:
# raise MyException('Uploading Failed')
print('Uploading Completed.')
# Restore CLI
print(
'\n1: Add, 2: Look Up, 3: List All, 4: Download\nEnter your request: ')
else:
raise MyException('Bad Request.')
except Exception:
soc.sendall(str.encode(self.V + ' 400 Bad Request\n'))
finally:
soc.close()
def add(self, num=None, title=None):
if not num:
num = input('Enter the RFC number: ')
if not num.isdigit():
raise MyException('Invalid Input.')
title = input('Enter the RFC title: ')
file = Path('%s/rfc%s.txt' % (self.DIR, num))
print(file)
if not file.is_file():
raise MyException('File Not Exit!')
msg = 'ADD RFC %s %s\n' % (num, self.V)
msg += 'Host: %s\n' % socket.gethostname()
msg += 'Post: %s\n' % self.UPLOAD_PORT
msg += 'Title: %s\n' % title
self.server.sendall(msg.encode())
res = self.server.recv(1024).decode()
print('Recieve response: \n%s' % res)
def lookup(self):
num = input('Enter the RFC number: ')
title = input('Enter the RFC title(optional): ')
msg = 'LOOKUP RFC %s %s\n' % (num, self.V)
msg += 'Host: %s\n' % socket.gethostname()
msg += 'Post: %s\n' % self.UPLOAD_PORT
msg += 'Title: %s\n' % title
self.server.sendall(msg.encode())
res = self.server.recv(1024).decode()
print('Recieve response: \n%s' % res)
def listall(self):
l1 = 'LIST ALL %s\n' % self.V
l2 = 'Host: %s\n' % socket.gethostname()
l3 = 'Post: %s\n' % self.UPLOAD_PORT
msg = l1 + l2 + l3
self.server.sendall(msg.encode())
res = self.server.recv(1024).decode()
print('Recieve response: \n%s' % res)
def pre_download(self):
num = input('Enter the RFC number: ')
msg = 'LOOKUP RFC %s %s\n' % (num, self.V)
msg += 'Host: %s\n' % socket.gethostname()
msg += 'Post: %s\n' % self.UPLOAD_PORT
msg += 'Title: Unkown\n'
self.server.sendall(msg.encode())
lines = self.server.recv(1024).decode().splitlines()
if lines[0].split()[1] == '200':
# Choose a peer
print('Available peers: ')
for i, line in enumerate(lines[1:]):
line = line.split()
print('%s: %s:%s' % (i + 1, line[-2], line[-1]))
try:
idx = int(input('Choose one peer to download: '))
title = lines[idx].rsplit(None, 2)[0].split(None, 2)[-1]
peer_host = lines[idx].split()[-2]
peer_port = int(lines[idx].split()[-1])
except Exception:
raise MyException('Invalid Input.')
# exclude self
if((peer_host, peer_port) == (socket.gethostname(), self.UPLOAD_PORT)):
raise MyException('Do not choose yourself.')
# send get request
self.download(num, title, peer_host, peer_port)
elif lines[0].split()[1] == '400':
raise MyException('Invalid Input.')
elif lines[0].split()[1] == '404':
raise MyException('File Not Available.')
elif lines[0].split()[1] == '500':
raise MyException('Version Not Supported.')
def download(self, num, title, peer_host, peer_port):
try:
# make connnection
soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# connect_ex return errors
if soc.connect_ex((peer_host, peer_port)):
# print('Try Local Network...')
# if soc.connect_ex(('localhost', peer_port)):
raise MyException('Peer Not Available')
# make request
msg = 'GET RFC %s %s\n' % (num, self.V)
msg += 'Host: %s\n' % socket.gethostname()
msg += 'OS: %s\n' % platform.platform()
soc.sendall(msg.encode())
# Downloading
header = soc.recv(1024).decode()
print('Recieve response header: \n%s' % header)
header = header.splitlines()
if header[0].split()[-2] == '200':
path = '%s/rfc%s.txt' % (self.DIR, num)
print('Downloading...')
try:
with open(path, 'w') as file:
content = soc.recv(1024)
while content:
file.write(content.decode())
content = soc.recv(1024)
except Exception:
raise MyException('Downloading Failed')
total_length = int(header[4].split()[1])
# print('write: %s | total: %s' % (os.path.getsize(path), total_length))
if os.path.getsize(path) < total_length:
raise MyException('Downloading Failed')
print('Downloading Completed.')
# Share file, send ADD request
print('Sending ADD request to share...')
if self.shareable:
self.add(num, title)
elif header[0].split()[1] == '400':
raise MyException('Invalid Input.')
elif header[0].split()[1] == '404':
raise MyException('File Not Available.')
elif header[0].split()[1] == '500':
raise MyException('Version Not Supported.')
finally:
soc.close()
# Restore CLI
# print('\n1: Add, 2: Look Up, 3: List All, 4: Download\nEnter your request: ')
def invalid_input(self):
raise MyException('Invalid Input.')
def shutdown(self):
print('\nShutting Down...')
self.server.close()
try:
sys.exit(0)
except SystemExit:
os._exit(0)
if __name__ == '__main__':
if len(sys.argv) == 2:
client = Client(sys.argv[1])
else:
client = Client()
client.start()