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zerolog.py
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import os
import psutil
import multiprocessing
import threading
import datetime
import queue
import inspect
from atexit import register
import sys
default_except_hook = sys.excepthook
class Logger(object):
instance = None
lock = threading.Lock()
log_queue = None
run_stop = multiprocessing.Value('i', 0)
__log_proc = None
unflushed_write_cnt = 0
write_buf_cnt = 1000
def __init__(self):
pass
@staticmethod
def start_log(log_conf):
"""
:param log_conf:
log_file:文本日志文件名
log_db:sqlite数据库名
time_out:读queue超时时间（秒）
flush_before_exit:是否需要读完所有queue消息才退出，N为不需要
:return:
"""
if Logger.instance is None:
Logger.lock.acquire()
if Logger.instance is None:
# print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f') + '开始初始化日志单例')
Logger.instance = Logger()
Logger.log_queue = multiprocessing.Queue()
Logger.log('INFO', '开始初始化日志单例')
Logger.__log_proc = multiprocessing.Process(target=write_log, args=(Logger.run_stop, Logger.log_queue, log_conf))
Logger.__log_proc.start()
# 主进程结束的时候会调用子进程的join()，因此需要通知并等待日志子进程先退出。
register(Logger.instance.__stop_log)
def custom_except_hook(exc_type, exc_value, exc_traceback):
print('custom except hook called')
Logger.instance.__stop_log()
default_except_hook(exc_type, exc_value, exc_traceback)
sys.excepthook = custom_except_hook
else:
# print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f') + '日志单例已经初始化')
Logger.log('WARN', '日志单例已经初始化')
Logger.lock.release()
else:
# print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f') + '日志单例已经初始化')
Logger.log('WARN', '日志单例已经初始化')
return Logger.instance
@staticmethod
def log(level, message, log_func=True, log_thread=True, name=''):
log_time = datetime.datetime.now()
if log_thread:
cur_thread = threading.current_thread()
thread_name = '{name}[{id}]'.format(name=cur_thread.getName(), id=cur_thread.ident)
else:
thread_name = ''
if log_func:
# inspect.stack() is tooooo slow!!!!
# caller_frame_record = inspect.stack()[1]
# file_name = caller_frame_record[1]
# line_num = caller_frame_record[2]
# func_name = caller_frame_record[3]
# sys._getframe is faster than inspect.currentframe()
# caller_frame = inspect.currentframe().f_back
caller_frame = sys._getframe(1)
file_name = caller_frame.f_code.co_filename
line_num = caller_frame.f_lineno
func_name = caller_frame.f_code.co_name
else:
file_name = ''
line_num = ''
func_name = ''
Logger.log_queue.put((log_time, thread_name, file_name, line_num, func_name, level, message, name))
@staticmethod
def __stop_log():
Logger.run_stop.value = 1
Logger.__log_proc.join()
Logger.log_queue.cancel_join_thread()
def write_log(status, log_queue, log_conf):
pid = os.getpid()
ppid = os.getppid()
proc = psutil.Process(pid)
parent_proc_hash = hash(psutil.Process(ppid))
proc_name = '{name}[{pid}<=P{ppid}]'.format(name=psutil.Process(pid).name(), pid=pid, ppid=ppid)
# message = '{log_time} {proc_name} {msg}'.format(log_time=datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f'),
# proc_name=proc_name,
# msg='开始记录日志')
# Logger.log('INFO', message)
write_file = None
write_db = False
if log_conf.get('log_file'):
__log_file = log_conf.get('log_file')
log_dir = os.path.dirname(os.path.abspath(__log_file))
if not os.path.exists(log_dir):
os.mkdir(log_dir)
write_file = open(file=__log_file, mode='a', encoding='utf8')
line = _self_short_log('INFO', f'{proc_name} 开始记录日志')
write_file.write(line)
if log_conf.get('log_db'):
__log_db = log_conf.get('log_db')
write_db = True
# todo: 检查log_db中是否存在表结构
if log_conf.get('time_out'):
time_out = float(log_conf.get('time_out'))
else:
time_out = 1
flush_before_exit = True
if log_conf.get('flush_before_exit') == 'N':
flush_before_exit = False
while True:
try:
(log_time, thread_name, file_name, line_num, func_name, level, message, name) = log_queue.get(
block=True, timeout=time_out)
if write_file:
line = _to_line(log_time, thread_name, file_name, line_num, func_name, level, message, name)
try:
write_line_to_file(write_file, line)
except Exception as e:
print(e)
if write_db:
pass
except queue.Empty:
flush_line_to_file(write_file)
# print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f') + " queue no data")
# TODO: 主进程不会先于子进程结束，这里的检测代码无用？
if psutil.pid_exists(ppid):
parent_proc = psutil.Process(ppid)
if not parent_proc or hash(parent_proc) != parent_proc_hash:
# log_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')
# message = f'{log_time} {proc_name} 主进程[{ppid}]不存在(已重新分配)'
# print(message)
line = _self_short_log('INFO', f'{proc_name} 主进程[{ppid}]不存在(已重新分配)')
flush_line_to_file(write_file, line)
break
else:
# log_time = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')
# message = f'{log_time} {proc_name} 主进程[{ppid}]不存在'
# print(message)
line = _self_short_log('INFO', f'{proc_name} 主进程[{ppid}]不存在')
flush_line_to_file(write_file, line)
break
if status.value != 0:
if (not flush_before_exit) or log_queue.qsize() == 0:
line = _self_short_log('INFO', f'{proc_name} 状态变更为停止,未写入消息[{log_queue.qsize()}]')
flush_line_to_file(write_file, line)
break
if write_file:
line = _self_short_log('INFO', f'{proc_name} 退出记录日志')
flush_line_to_file(write_file, line)
write_file.close()
# message = '{log_time} {proc_name} {msg}'.format(log_time=datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f'),
# proc_name=proc_name,
# msg='退出记录日志')
# print(message)
def str_code_point(s):
return ''.join(['\\u{:0>4x}'.format(ord(c)) for c in s])
def env_to_str(env):
key_list = [key for key in env.keys()]
key_list.sort()
return '\n'.join(['[{key}]:[{value}]'.format(key=key, value=env.get(key)) for key in key_list])
def _to_line(log_time, thread_name, file_name, line_num, func_name, level, message, name):
line = '{log_time},{thread_name},{file_name},{func_name},{line_num},{level},{name},{message}\n'.format(
log_time=log_time.strftime('%Y-%m-%d %H:%M:%S.%f'),
thread_name=thread_name,
file_name=file_name,
func_name=func_name,
line_num=line_num,
name=name,
level=level,
message=message)
return line
def _self_short_log(level, msg):
log_time = datetime.datetime.now()
thread_name = ''
file_name = ''
line_num = ''
func_name = ''
name = ''
line = _to_line(log_time, thread_name, file_name, line_num, func_name, level, msg, name)
return line
def write_line_to_file(file, line):
file.write(line)
Logger.unflushed_write_cnt += 1
if Logger.unflushed_write_cnt >= Logger.write_buf_cnt:
file.flush()
Logger.unflushed_write_cnt = 0
def flush_line_to_file(file, line=None):
if line:
file.write(line)
file.flush()
Logger.unflushed_write_cnt = 0