Python 套接字服务器，限制接收数据

Question

When trying to send a file with sockets from one device on my.network to another it is throttling the data to 2760 bytes and not receiving the whole file on the server side

Here is the code of my server on my raspberry pi:

import socket
import os

host = "my_ip"
port = "my_port"

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host, port))
s.listen()

def send(mess):
    con.send(bytes(mess, "utf-8"))

def receive():
    global message
    message = con.recv(22000).decode('utf-8')

while True:
    try:
        con, address = s.accept()
        print(f"Connection to {address} made successfully")
        receive()
        if message == "quit":
            break
        else:
            send("received")
            print(len(message))
            with open("file.py", 'w', encoding='utf-8')as a:
                a.write(message)
            os.system("python3 file.py")
    except:
        pass

And here is the code of my client on another device

with open('file.py', 'r', encoding = 'utf-8')as f:
    python_file = f.read()

print(len(python_file))
#returns 20940
import socket

host = "my_ip"
port = my_port

def send(mess):
    s.send(bytes(mess, 'utf-8'))
    
def receive():
    message = s.recv(1024).decode('utf-8')
    print(message)
    
while True:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    send_it = input("Send File?[y/n]: ")
    if send_it == "y":
        try:
            s.connect((host, port))
            send(python_file)
            recieve()
        except:
            pass
    if send_it == "quit":
        try:
            s.connect((host, port))
            send(send_it)
            recieve()
        except:
            pass
    else:
        pass

When i take off the try loop it doesn't give any errors or reason as to why im only receiving part (2760 bytes) of the file. Also it will randomly(rarely) send more than 2760 bytes or it will sometimes send all the bytes. Its pretty consistently only sending 2760 bytes though.

Answer 1

Maybe you want to use sendall() instead of send() . Basically sendall() guarantees that all data will be sent unless an exception is raised and it's a python feature that is offered by other high level languages as well.

In order to receive all bytes sent, it's a good idea to do that using a loop:

data = bytearray(1)
# loop until there is no more data to receive.
while data:
   data = socket.recv(1024) # Receive 1024 bytes at a time.

There is a well explained answer on what the difference between send() and sendall() is in python here .