Python写的服务监控程序实例

# ./configure --prefix=/usr/local/python27
# make
# make install

# ./configure
# make
# make install

#!/usr/bin/python 
#-*- coding: UTF-8 -*- 
# cheungmine 
# stdin、stdout和stderr分别表示子程序的标准输入、标准输出和标准错误。 
#  
# 可选的值有: 
#   subprocess.PIPE - 表示需要创建一个新的管道. 
#   一个有效的文件描述符（其实是个正整数） 
#   一个文件对象 
#   None - 不会做任何重定向工作，子进程的文件描述符会继承父进程的. 
#  
# stderr的值还可以是STDOUT, 表示子进程的标准错误也输出到标准输出. 
#  
# subprocess.PIPE 
# 一个可以被用于Popen的stdin、stdout和stderr 3个参数的特输值，表示需要创建一个新的管道. 
#  
# subprocess.STDOUT 
# 一个可以被用于Popen的stderr参数的特输值，表示子程序的标准错误汇合到标准输出. 
################################################################################ 
import os 
import sys 
import getopt 
 
import time 
import datetime 
 
import codecs 
 
import optparse 
import ConfigParser 
 
import signal 
import subprocess 
import select 
 
# logging 
# require python2.6.6 and later 
import logging   
from logging.handlers import RotatingFileHandler 
 
## log settings: SHOULD BE CONFIGURED BY config 
LOG_PATH_FILE = "./my_service_mgr.log" 
LOG_MODE = 'a' 
LOG_MAX_SIZE = 4*1024*1024 # 4M per file 
LOG_MAX_FILES = 4          # 4 Files: my_service_mgr.log.1, printmy_service_mgrlog.2, ...   
LOG_LEVEL = logging.DEBUG   
 
LOG_FORMAT = "%(asctime)s %(levelname)-10s[%(filename)s:%(lineno)d(%(funcName)s)] %(message)s"   
 
handler = RotatingFileHandler(LOG_PATH_FILE, LOG_MODE, LOG_MAX_SIZE, LOG_MAX_FILES) 
formatter = logging.Formatter(LOG_FORMAT) 
handler.setFormatter(formatter) 
 
Logger = logging.getLogger() 
Logger.setLevel(LOG_LEVEL) 
Logger.addHandler(handler)  
 
# color output 
# 
pid = os.getpid()  
 
def print_error(s): 
    print '\033[31m[%d: ERROR] %s\033[31;m' % (pid, s) 
 
def print_info(s): 
    print '\033[32m[%d: INFO] %s\033[32;m' % (pid, s) 
 
def print_warning(s): 
    print '\033[33m[%d: WARNING] %s\033[33;m' % (pid, s) 
 
 
def start_child_proc(command, merged): 
    try: 
        if command is None: 
            raise OSError, "Invalid command" 
 
        child = None 
 
        if merged is True: 
            # merge stdout and stderr 
            child = subprocess.Popen(command, 
                stderr=subprocess.STDOUT, # 表示子进程的标准错误也输出到标准输出 
                stdout=subprocess.PIPE    # 表示需要创建一个新的管道 
            ) 
        else: 
            # DO NOT merge stdout and stderr 
            child = subprocess.Popen(command, 
                stderr=subprocess.PIPE, 
                stdout=subprocess.PIPE) 
 
        return child 
 
    except subprocess.CalledProcessError: 
        pass # handle errors in the called executable 
    except OSError: 
        pass # executable not found 
 
    raise OSError, "Failed to run command!" 
 
 
def run_forever(command): 
    print_info("start child process with command: " + ' '.join(command)) 
    Logger.info("start child process with command: " + ' '.join(command)) 
 
    merged = False 
    child = start_child_proc(command, merged) 
 
    line = '' 
    errln = '' 
 
    failover = 0 
 
    while True: 
        while child.poll() != None: 
            failover = failover + 1 
            print_warning("child process shutdown with return code: " + str(child.returncode))            
            Logger.critical("child process shutdown with return code: " + str(child.returncode)) 
 
            print_warning("restart child process again, times=%d" % failover) 
            Logger.info("restart child process again, times=%d" % failover) 
            child = start_child_proc(command, merged) 
 
        # read child process stdout and log it 
        ch = child.stdout.read(1) 
        if ch != '' and ch != '\n': 
            line += ch 
        if ch == '\n': 
            print_info(line) 
            line = '' 
 
        if merged is not True: 
            # read child process stderr and log it 
            ch = child.stderr.read(1) 
            if ch != '' and ch != '\n': 
                errln += ch 
            if ch == '\n': 
                Logger.info(errln) 
                print_error(errln) 
                errln = '' 
 
    Logger.exception("!!!should never run to this!!!")   
 
 
if __name__ == "__main__": 
    run_forever(["python", "./testpipe.py"]) 

#!/usr/bin/python 
#-*- coding: UTF-8 -*- 
# cheungmine 
# 模拟一个woker进程,10秒挂掉 
import os 
import sys 
 
import time 
import random 
 
cnt = 10 
 
while cnt >= 0: 
    time.sleep(0.5) 
    sys.stdout.write("OUT: %s\n" % str(random.randint(1, 100000))) 
    sys.stdout.flush() 
 
    time.sleep(0.5) 
    sys.stderr.write("ERR: %s\n" % str(random.randint(1, 100000))) 
    sys.stderr.flush() 
 
    #print str(cnt) 
    #sys.stdout.flush() 
    cnt = cnt - 1 
 
sys.exit(-1) 

$ python service_mgr.py

> start pythonw service_mgr.py

run_forever(["python", "testpipe.py"])