[英]send multiple packets of data using python socket programming
所以现在我有一个服务器和客户端脚本。 我正在尝试将文件从客户端上传到服务器。 但是,客户端中文件的数据将被 HEADER 大小剪切掉。 如何在同一个发送命令下将多个数据包发送到服务器?
服务器.py:
import socket
import threading
HEADER=2048
PORT=5050
SERVER=socket.gethostbyname(socket.gethostname())
ADDR=(SERVER,PORT)
FORMAT='utf-8'
DISCONNECT_MESSAGE='!DISCONNECT'
SEPARATOR='<SEPERATE>'
server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server.bind(ADDR)
def handle_client(conn,addr):
print(f'[NEW CONNECTION] {addr} connected.')
connected=True
while connected:
data=conn.recv(HEADER).decode(FORMAT)
if data==DISCONNECT_MESSAGE:
connected=False
else:
data=data.split(SEPARATOR)
file=open(data[0],'w')
file.write(data[1])
print('file received')
conn.send('file received'.encode(FORMAT))
conn.close()
print(f'[DISCONNECT] {addr} disconnected')
def start():
server.listen()
print(f'[LISTENING] Server is listening on {SERVER}')
while True:
conn,addr=server.accept()
thread=threading.Thread(target=handle_client,args=(conn,addr))
thread.start()
print(f'[ACTIVE CONNECTIONS] {threading.activeCount()-1}')
print("[STARTING] server is starting...")
start()
客户端.py:
import socket
HEADER=2048
PORT=5050
FORMAT='utf-8'
DISCONNECT_MESSAGE='!DISCONNECT'
SEPARATOR='<SEPERATE>'
SERVER=socket.gethostbyname(socket.gethostname())
ADDR=(SERVER,PORT)
client=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect(ADDR)
def send(msg):
message=msg.encode(FORMAT)
client.send(message)
print(client.recv(HEADER).decode(FORMAT))
file=open('question_pool.csv','r')
data=file.read()
send(f'question_pool.csv{SEPARATOR}{data}')
file.close()
send(DISCONNECT_MESSAGE)
简而言之,您想要发送大于HEADER
大小的任何文件的多个块。 将文件拆分为小于HEADER
大小的块,并单独发送每个块。 然后,当所有块都设置好后,发送一条消息,说明整个文件已发送,以便服务器可以保存它。
这是我用于上述解决方案的代码:
server.py
:
import socket
import threading
HEADER = 2048
PORT = 5050
SERVER = socket.gethostbyname(socket.gethostname())
ADDR = (SERVER, PORT)
FORMAT = 'utf-8'
DISCONNECT_MESSAGE = '!DISCONNECT'
SEPARATOR = '<SEPERATE>'
FILE_FINISHED_SENDING = '<!FILE_SENT!>'
server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server.bind(ADDR)
def handle_client(conn, addr):
print(f'[NEW CONNECTION] {addr} connected.')
connected = True
current_file = None
while connected:
data = conn.recv(HEADER).decode(FORMAT)
if data == DISCONNECT_MESSAGE:
connected = False
elif data == FILE_FINISHED_SENDING:
current_file.close()
current_file = None
conn.send(b'file received.')
else:
data = data.split(SEPARATOR)
if len(data) == 2 and data[1] == '':
# The name of the file was sent, more will follow.
current_file = open(data[0], 'w')
conn.send(b'filename recieved')
else:
# File data was send, so write it to the current file
current_file.write(data[1])
print('chunk of file recv''d')
conn.send(b'chunk received')
conn.close()
print(f'[DISCONNECT] {addr} disconnected')
def start():
server.listen()
print(f'[LISTENING] Server is listening on {SERVER}')
while True:
conn, addr = server.accept()
thread = threading.Thread(target=handle_client, args=(conn,addr))
thread.start()
print(f'[ACTIVE CONNECTIONS] {threading.activeCount()-1}')
print("[STARTING] server is starting...")
start()
client.py
:
import socket
from pathlib import Path
HEADER = 2048
PORT = 5050
FORMAT = 'utf-8'
DISCONNECT_MESSAGE = '!DISCONNECT'
SEPARATOR = '<SEPERATE>'
FILE_FINISHED_SENDING = '<!FILE_SENT!>'
SERVER = socket.gethostbyname(socket.gethostname())
ADDR = (SERVER, PORT)
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect(ADDR)
def chunker(string: str, size: int):
return (string[pos:pos + size] for pos in range(0, len(string), size))
def send(msg):
message = msg.encode(FORMAT)
client.send(message)
print(client.recv(HEADER).decode(FORMAT))
def send_file(filepath: str):
with open(filepath, 'r', encoding=FORMAT) as f:
data = f.read()
first_bits = f'{Path(filepath).name}{SEPARATOR}' # Easy way of getting just a file's name from its path
send(first_bits) # Send the filename to the server
for chunk in chunker(data, HEADER-48): # Leave a safe buffer
# Send each chunk of the file
send(f"{SEPARATOR}{chunk}")
# Tell the server that's all for this file.
# Now it can close the file object.
send(FILE_FINISHED_SENDING)
send_file("/path/to/file.html")
send(DISCONNECT_MESSAGE)
SEPARATOR
、 FILE_FINISHED_SENDING
和DISCONNECT_MESSAGE
不会出现在您发送的文件中。 否则事情可能会变得不稳定。.mp3
。
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