[英]Running an echo server as a daemon process for testing in python
我想自動測試儀器並編寫了一個小服務器程序來模擬儀器,除非它收到特殊命令“*IDN?”,否則它將發送回命令。 當我直接在自己的腳本中運行回顯服務器,然后單獨運行客戶端腳本時,一切正常,並且我得到了預期的結果。 現在我想直接從測試腳本運行服務器。 所以我想我會使用多處理來啟動它。 但問題似乎是當服務器套接字到達 s.accept() 行時,它只是在那里等待並且永遠不會返回。 那么,如果我不能在與測試功能相同的代碼中運行此服務器,我該如何完成自動化測試呢?
import socket
import multiprocessing as mp
import time,sys
HOST = '127.0.0.1' # Standard loopback interface address (localhost),
PORT = 65432 # Port to listen on (non-privileged ports are > 1023),
FTP_PORT = 63217 # Port for ftp testing, change to 21 for device
def handle_connection(conn,addr):
with conn:
conn.send('Connected by', addr)
print("Got connection")
data = conn.recv(1024)
if not data:
return 'Nodata'
elif (data == b'*IDN?\n'):
print('SONY/TEK,AWG520,0,SCPI:95.0 OS:3.0 USR:4.0\n')
conn.sendall(b'SONY/TEK,AWG520,0,SCPI:95.0 OS:3.0 USR:4.0\n')
return 'IDN'
else:
conn.sendall(data)
return 'Data'
def echo_server(c_conn,host=HOST,port=PORT):
# this server simulates the AWG command protocol, simply echoing the command back except for IDN?
p = mp.current_process()
print('Starting echo server:', p.name, p.pid)
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((host, port))
s.listen()
try:
while True:
print("Waiting for connection...")
c_conn.send('waiting for connection...')
conn, addr = s.accept()
handle_connection(conn,addr)
c_conn.send('serving client...')
finally:
conn.close()
c_conn.send('done')
time.sleep(2)
print('Exiting echo server:', p.name, p.pid)
sys.stdout.flush()
def test_echo_server():
print("entering client part")
with socket.socket(socket.AF_INET,socket.SOCK_STREAM) as mysock:
mysock.connect((HOST,PORT))
mysock.sendall('test\n'.encode())
data = mysock.recv(1024)
print('received:',repr(data))
if __name__ == '__main__':
parent_conn, child_conn = mp.Pipe()
echo_demon = mp.Process(name='echo', target=echo_server(child_conn, ))
echo_demon.daemon = True
echo_demon.start()
time.sleep(1)
echo_demon.join(1)
test_echo_server()
if parent_conn.poll(1):
print(parent_conn.recv())
else:
print('Waiting for echo server')
我設法使用我在 Romano、Baka 和 Phillips 的“Python 入門”一書中找到的一些代碼片段解決了我自己的問題。 這是服務器的代碼:
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((HOST, PORT))
s.listen()
try:
while True:
print("Waiting for connection...")
client, addr = s.accept()
with client:
data = client.recv(1024)
if not data:
break
elif (data == b'*IDN?\n'):
client.sendall(b'SONY/TEK,AWG520,0,SCPI:95.0 OS:3.0 USR:4.0\n')
else:
client.sendall(data)
finally:
time.sleep(1)
print('Exiting echo server:')
這是在單獨的進程中運行此服務器的測試文件的代碼,以及一些簡單的測試:
@pytest.fixture(scope="session")
def awgserver():
print("loading server")
p = subprocess.Popen(["python3", "server.py"])
time.sleep(1)
yield p
p.terminate()
@pytest.fixture
def clientsocket(request):
print("entering client part")
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as mysock:
mysock.connect((HOST, PORT))
yield mysock
mysock.close()
@pytest.mark.run_this
def test_echo(awgserver, clientsocket):
clientsocket.send(b"*IDN?\n")
#assert clientsocket.recv(1024) == b"SONY/TEK,AWG520,0,SCPI:95.0 OS:3.0 USR:4.0\n"
assert clientsocket.recv(10) == b"TEK" # deliberately make test fail
@pytest.mark.run_this
def test_echo2(awgserver, clientsocket):
clientsocket.send(b"def")
assert clientsocket.recv(3) == b"def"
將 HOST 設置為環回 IP,將 PORT 設置為 > 1024
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