#!/usr/bin/python2.7
#coding=utf-8
import socket
import os
import sys
import Constants
from io import BytesIO as StringIO
def socket_server():
f = StringIO()
server_address = Constants.SOCKET_FILE
# Make sure the socket does not already exist
try:
os.unlink(server_address)
except OSError:
if os.path.exists(server_address):
raise
# Create a UDS socket
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
# Bind the socket to the address
print('starting up on {}'.format(server_address))
sock.bind(server_address)
# Listen for incoming connections
sock.listen(1)
while True:
# Wait for a connection
print('waiting for a connection')
connection, client_address = sock.accept()
try:
print('connection from', client_address)
# Receive the data in small chunks and retransmit it
while True:
data = connection.recv(16)
print('received {!r}'.format(data))
if data:
print('sending data back to the client')
if data == "get":
connection.sendall(read_from_memory(f))
else:
write_into_memory(f,data)
else:
print('no data from', client_address)
break
finally:
# Clean up the connection
connection.close()
def write_into_memory(string_io,info):
"""
状态的写入分别包含:
nodeId int // 1 | 2
redisState int // 0: unknown, 1: master, 2: slave, [3, ]: down
remoteOpState int // 0: unknown, 1: active
masterId int // 1 | 2, master node ID
:return:
"""
string_io.write(info)
return
def read_from_memory(string_io):
return string_io.read()
if __name__ == "__main__":
# do the UNIX double-fork magic, see Stevens' "Advanced
# Programming in the UNIX Environment" for details (ISBN 0201563177)
try:
pid = os.fork()
if pid > 0:
# exit first parent
sys.exit(0)
except OSError, e:
print >>sys.stderr, "fork #1 failed: %d (%s)" % (e.errno, e.strerror)
sys.exit(1)
# decouple from parent environment
os.chdir("/")
os.setsid()
os.umask(0)
# do second fork
try:
pid = os.fork()
if pid > 0:
# exit from second parent, print eventual PID before
print "Daemon PID %d" % pid
sys.exit(0)
except OSError, e:
print >>sys.stderr, "fork #2 failed: %d (%s)" % (e.errno, e.strerror)
sys.exit(1)
# start the daemon main loop
socket_server()
python实现守护进程的方法
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