March 2021

一. 客户端代码


# 命名为client.py
import socket
import sys
import time

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Connect the socket to the port where the server is listening
# 注意修改适配目标主机的ip地址和监听端口
server_address = ('172.0.0.1', 20000)
#print('connecting to {} port {}'.format(*server_address))
sock.connect(server_address)

try:

    # Send data
    message = str(round(time.time()*1e6))
    message = bytes(message, 'utf8')
    #print('sending {!r}'.format(message))
    sock.sendall(message)

    # Look for the response
    amount_received = 0
    amount_expected = len(message)

    while amount_received < amount_expected:
        data = sock.recv(32)
        amount_received += len(data)
        str_data = data.decode('utf8')
        #print(str_data)
        index = str_data.index('|')
        timestamp = str_data[:index]
        latency  = str_data[index+1:]
        now = round(time.time()*1e6)
        diff = int(now)-int(timestamp)
        #print('Receive latency {0} peer latency:{1}'.format(diff, latency))
        y1 = int(diff)
        x1 = int(latency)
        a = (x1-y1)*1.0/2
        b = -(y1+x1)*1.0/2
        print('Current machine clock - Target machine clock = {0} ns Network latency = {1} ns'.format(b,a))
finally:
    sock.close()

# 命名为client.py

import socket

import sys

import time

# Create a TCP/IP socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Connect the socket to the port where the server is listening

# 注意修改适配目标主机的ip地址和监听端口

server_address = ('172.0.0.1', 20000)

#print('connecting to {} port {}'.format(*server_address))

sock.connect(server_address)

try:

# Send data

message = str(round(time.time()*1e6))

message = bytes(message, 'utf8')

#print('sending {!r}'.format(message))

sock.sendall(message)

# Look for the response

amount_received = 0

amount_expected = len(message)

while amount_received < amount_expected:

data = sock.recv(32)

amount_received += len(data)

str_data = data.decode('utf8')

#print(str_data)

index = str_data.index('|')

timestamp = str_data[:index]

latency = str_data[index+1:]

now = round(time.time()*1e6)

diff = int(now)-int(timestamp)

#print('Receive latency {0} peer latency:{1}'.format(diff, latency))

y1 = int(diff)

x1 = int(latency)

a = (x1-y1)*1.0/2

b = -(y1+x1)*1.0/2

print('Current machine clock - Target machine clock = {0} ns Network latency = {1} ns'.format(b,a))

finally:

sock.close()

二....

March 2021

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