Make logging simple, log even exception that you forgot to catch. Make multiprocessing logging becomes a breeze
Project description
Logger_tt
Make configuring logging simpler and log even exceptions that you forgot to catch.
Even multiprocessing logging becomes a breeze.
Table of contents
Install
- From PYPI:
pip install logger_tt
- From Github: clone or download this repo then
python setup.py install
Overview:
In the most simple case, add the following code into your main python script of your project:
from logger_tt import setup_logging
setup_logging(full_context=1)
Then from any of your modules, you just need to get a logger
and start logging.
There are two ways that you could obtain a logger.
-
Conventional way: as you have always done it that way
from logging import getLogger logger = getLogger(__name__)
-
Convenient way: use a pre-made logger named
logger_tt
from this package.from logger_tt import logger
After that, you start logging as usual:
logger.debug('Module is initialized')
logger.info('Making connection ...')
# output
[2020-07-21 11:24:19] [__main__:5 DEBUG] Module is initialized
[2020-07-21 11:24:19] [__main__:6 INFO] Making connection ...
Both ways give you the same output except the line number, obviously.
The pre-made logger also has an advantage that it will automatically inject
threadName
and processName
to the output in case of multithreading or multiprocessing.
Both ways will provide your project with the following default log behaviors:
-
log file: Assume that your
working directory
isproject_root
, log.txt is stored at yourproject_root/logs/
folder.
If the log path doesn't exist, it will be created.
The log file is time rotated at midnight. A maximum of 15 dates of logs will be kept. This log file'slevel
isDEBUG
.
The log format is[%(asctime)s] [%(name)s:%(lineno)d %(levelname)s] %(message)s
,
where the time format is%Y-%m-%d %H:%M:%S
.
Example:[2020-05-09 00:31:33] [myproject.mymodule:26 DEBUG] Module is initialized
-
console: log records with level
INFO
and above will be printed tostdout
of the console.
The format for console log is simpler:[%(asctime)s] %(levelname)s: %(message)s
.
Example:[2020-05-09 00:31:34] INFO: Making connection ...
-
urllib3
logger: this ready-made logger is to silent unwanted messages fromrequests
library. -
suppressed logger:
exchangelib
. This sets logging level ofexchangelib
logger toWARNING
.
This is another way to silent unwanted messages from other module, read below for details. -
root
logger: if there is no logger initialized in your module, this logger will be used with the above behaviors. This logger is also used to log uncaught exception in your project. Example:raise RecursionError
# log.txt [2020-05-31 19:16:01] [root ERROR] Uncaught exception Traceback (most recent call last): File "D:/MyProject/Echelon/eyes.py", line 13, in <module> raise RecursionError => var_in = Customer(name='John', member_id=123456) => arg = (456, 789) => kwargs = {'my_kw': 'hello', 'another_kw': 'world'} RecursionError
-
context logging: When an exception occur, variables used in the line of error are also logged.
To log full local variables of current function scope, passfull_context=1
tosetup_logging
.
If you need the outer scope too, setfull_context
to2
,3
and so on...
Usage:
All configs are done through setup_logging
function:
setup_logging(config_path="", log_path="",
capture_print=False, strict=False, guess_level=False,
full_context=False,
suppress_level_below=logging.WARNING,
use_multiprocessing=False,
limit_line_length=1000,
analyze_raise_statement=False,
host="",
port=0,
)
This function also return a LogConfig
object.
Except config_path
, log_path
, use_multiprocessing
, host
and port
,
other parameters are attributes of this object and can be changed on the fly.
Except config_path
, log_path
, all other parameters can be defined in logger_tt
section in the config file
(see Sample config
chapter below).
Parameter with the same name passed in setup_logging
function will override the one in the config file.
1. Overwrite the default log path:
Instead of ./logs/logs.txt
, you can overwrite with your own as follows
setup_logging(log_path='new/path/to/your_log.txt')
If you have multiple handlers and want each of them log to different destinations,
you can pass in a dict of "handler_name": "log_path"
.
The handler names must match what is defined in the config file.
setup_logging(log_path={'error_file_handler': 'log/error.txt',
'info_file_handler': 'log/info_and_above.txt',
}
)
2. Provide your config file:
You can config your own logger and handler by providing either yaml
or json
config file as follows:
setup_logging(config_path='path/to/.yaml_or_.json')
Without providing a config file, the default config file with the above default log behavior is used.
You could copy log_conf.yaml
or log_conf.json
shipped with this package to start making your version.
Warning: To process .yaml
config file, you either need pyyaml
or ruamel.yaml
package installed.
3. Capture stdout:
If you have an old code base with a lot of print(msg)
or sys.stdout.write(msg)
and
don't have access or time to refactor them into something like logger.info(msg)
,
you can capture these msg
and log them to file, too.
To capture only msg
that is printed out by print(msg)
, simply do as follows:
setup_logging(capture_print=True)
Example:
print('To be or not to be')
sys.stdout.write('That is the question')
# log.txt
[2020-05-09 11:42:08] [PrintCapture INFO] To be or not to be
Yes, That is the question
is not captured.
Some libraries may directly use sys.stdout.write
to draw on the screen (eg. progress bar) or do something quirk.
This kind of information is usually not useful for users. But when you do need it, you can capture it as follows:
setup_logging(capture_print=True, strict=True)
Example:
sys.stdout.write('The plane VJ-723 has been delayed')
sys.stdout.write('New departure time has not been scheduled')
# log.txt
[2020-05-09 11:42:08] [PrintCapture INFO] The plane VJ-723 has been delayed
[2020-05-09 11:42:08] [PrintCapture INFO] New departure time has not been scheduled
As you have seen, the log level of the captured message is INFO
.
What if the code base prints something like An error has occurred. Abort operation.
and you want to log it as Error
?
Just add guess_level=True
to setup_logging()
.
setup_logging(capture_print=True, guess_level=True)
Example:
print('An error has occurred. Abort operation.')
print('A critical error has occurred during making request to database')
# log.txt
[2020-05-09 11:42:08] [PrintCapture ERROR] An error has occurred. Abort operation.
[2020-05-09 11:42:08] [PrintCapture CRITICAL] A critical error has occurred during making request to database
Note: Capturing stdout ignores messages of blank line
.
That means messages like \n\n
or
(spaces) will not appear in the log.
But messages that contain blank line(s) and other characters will be fully logged.
For example, \nTo day is a beautiful day\n
will be logged as is.
4. Exception logging:
Consider the following error code snippet:
API_KEY = "asdjhfbhbsdf82340hsdf09u3ionf98230234ilsfd"
TIMEOUT = 60
class MyProfile:
def __init__(self, name):
self.my_boss = None
self.name = name
def my_faulty_func(my_var, *args, **kwargs):
new_var = 'local scope variable'
me = MyProfile('John Wick')
boss = MyProfile('Winston')
me.my_boss = boss
print(f'Information: {var} and {me.my_boss.name}'
' at {me.my_boss.location} with {API_KEY}')
if __name__ == '__main__':
cpu_no = 4
max_concurrent_processes = 3
my_faulty_func(max_concurrent_processes, 'ryzen 7', freq=3.4)
In our hypothetical code above,print
function will raise an exception.
This exception, by default, will not only be logged but also analyzed with objects that appeared in the line:
[2020-06-06 09:36:01] ERROR: Uncaught exception:
Traceback (most recent call last):
File "D:/MyProject/AutoBanking/main.py", line 31, in <module>
my_faulty_func(max_concurrent_processes, 'ryzen 7', freq=3.4)
|-> my_faulty_func = <function my_faulty_func at 0x0000023770C6A288>
|-> max_concurrent_processes = 3
File "D:/MyProject/AutoBanking/main.py", line 25, in my_faulty_func
print(f'Information: {var} and {me.my_boss.name}'
' at {me.my_boss.location} with {API_KEY}')
|-> me.my_boss.name = 'Winston'
|-> me.my_boss.location = '!!! Not Exists'
|-> (outer) API_KEY = 'asdjhfbhbsdf82340hsdf09u3ionf98230234ilsfd'
NameError: name 'var' is not defined
Note: look at the print(f'Information...
line,
logger-tt
print this error line different from normal python traceback!
With normal traceback, multi-line python statement has its only first line printed out.
With logger-tt
, a full statement is grabbed for you.
For each level in the stack, any object that appears in the error line is shown with its readable representation
.
This representation may not necessarily be __repr__
. The choice between __str__
and __repr__
are as follows:
__str__
:__str__
is present, and the object class's__repr__
is default with<class name at Address>
.__repr__
:__str__
is present, but the object class's__repr__
is anything else, such asClassName(var=value)
.
Also, when__str__
is missing, even if__repr__
is<class name at Address>
, it is used.
Currently, if an object doesn't exist and is directly accessed, as var
in this case, it will not be shown up.
But if it is attribute accessed with dot .
, as location
in me.my_boss.location
,
then its value is an explicit string '!!! Not Exists'
.
As you may have noticed, a variable API_KEY
has its name prefixed with outer
.
This tells you that the variable is defined in the outer scope, not local.
More often than not, only objects in the error line are not sufficient to diagnose what has happened.
You want to know what the inputs of the function were. You want to know what the intermediate
calculated results were. You want to know other objects that appeared during runtime,
not only local but also outer scope. In other words, you want to know the full context of what has happened.
logger-tt
is here with you:
setup_logging(full_context=2)
With the above hypothetical code snippet, the error log becomes the following:
[2020-06-06 10:35:21] ERROR: Uncaught exception:
Traceback (most recent call last):
File "D:/MyProject/AutoBanking/main.py", line 31, in <module>
my_faulty_func(max_concurrent_processes, 'ryzen 7', freq=3.4)
|-> my_faulty_func = <function my_faulty_func at 0x0000019E3599A288>
|-> max_concurrent_processes = 3
=> __name__ = '__main__'
=> __doc__ = None
=> __package__ = None
=> __loader__ = <_frozen_importlib_external.SourceFileLoader object at 0x0000019E35840E48>
=> __spec__ = None
=> __annotations__ = {}
=> __builtins__ = <module 'builtins' (built-in)>
=> __file__ = 'D:/MyProject/AutoBanking/main.py'
=> __cached__ = None
=> setup_logging = <function setup_logging at 0x0000019E35D111F8>
=> getLogger = <function getLogger at 0x0000019E35BC7C18>
=> logger = <Logger __main__ (DEBUG)>
=> API_KEY = 'asdjhfbhbsdf82340hsdf09u3ionf98230234ilsfd'
=> TIMEOUT = 60
=> MyProfile = <class '__main__.MyProfile'>
=> cpu_no = 4
File "D:/MyProject/AutoBanking/main.py", line 25, in my_faulty_func
print(f'Information: {var} and {me.my_boss.name} at {me.my_boss.location} with {API_KEY}')
|-> me.my_boss.name = 'Winston'
|-> me.my_boss.location = '!!! Not Exists'
|-> (outer) API_KEY = 'asdjhfbhbsdf82340hsdf09u3ionf98230234ilsfd'
=> my_var = 3
=> args = ('ryzen 7',)
=> kwargs = {'freq': 3.4}
=> new_var = 'local scope variable'
=> me = <__main__.MyProfile object at 0x0000019E35D3BA48>
=> boss = <__main__.MyProfile object at 0x0000019E35D3B9C8>
NameError: name 'var' is not defined
Additional objects that not appear in the error line are prefixed with =>
.
Note: from version 1.6, uncaught exception happened in child thread of a multithreading
program will also be caught by logger-tt
and logged normally.
If you are using python 3.8+, the new threading.excepthook
won't be called as the uncaught exception
has been handled by logger-tt
.
5. try-except
exception logging:
exception context
logging also applies for try-except
block.
This means that if you call logger.exception()
inside except
block,
you would have all variables' value at the line of exception. For example,
def my_faulty_func():
a = 10
b = 0
c = a/b
return c
def my_main():
try:
my_faulty_func()
except Exception as e:
logger.exception('some error has occured')
print('Clean up resource')
my_main()
Then the log will show up as follows:
[2020-06-12 21:37:00] ERROR: some error has occured
Traceback (most recent call last):
File "D:/MyProject/exception_log.py", line 19, in my_main
my_faulty_func()
|-> my_faulty_func = <function my_faulty_func at 0x000001875DD4B168>
File "D:/MyProject/exception_log.py", line 13, in my_faulty_func
c = a / b
|-> a = 10
|-> b = 0
ZeroDivisionError: division by zero
Clean up resource
Note: As in python's logging document,
logger.exception()
should only be called from an exception handler, eg. inside except
block.
You don't need to pass exception object
to logger.exception()
.
It already knows how to get a traceback internally.
This enable you to pass any string in as a hint or a short description of what may have happened.
Otherwise, passing exception object
, as logger.exception(e)
,
will cause the first line of error report to be the message of exception.
In the case of the above example, it would be come [2020-06-12 21:37:00] ERROR: division by zero
.
6. Silent unwanted loggers:
Third party modules also have loggers, and their messages are usually not related to your code. A bunch of unwanted messages may hide the one that come from your own module. To prevent that and also reduce log file size, we need to silent unwanted loggers.
By config file, there are two ways to silent a logger:
-
Create a new logger: in
logger
section of the config file, add a new logger whose name is the same with the one you want to silent. Set it level toWARNING
or above. If you addhandlers
, you should also setpropagate
tono
orFalse
. Otherwise, the same message may be logged multiple times. Ex:urllib3: level: WARNING handlers: [console, error_file_handler] propagate: no
Above setting only allow messages with level
WARNING
and above to be processed. Usually that is enough to silent most of unwanted messages. If you need to silent more messages, tryERROR
orCRITICAL
. -
Add logger's name to
suppress list
: Then a new logger with level default toWARNING
will be automatically created for you. Ex:suppress: [exchangelib, urllib3]
If you need to suppress at even higher level, use
suppress_level_below
insetup_logging
. For example suppress any message belowERROR
level that comes from loggers insuppress list
:setup_logging(suppress_level_below=logging.ERROR)
You could also suppress loggers directly by setup_logging
:
from logger_tt import setup_logging
setup_logging(suppress=['urllib3', 'exchangelib'])
7. Logging in multiprocessing:
This is archived by using multiprocessing queues or a socket server.
For linux, copy-on-write while forking carries over logger's information.
So multiprocess.Queue
is enough in this case.
For Windows, it is important that setup_logging()
must be call out side of if __name__ == '__main__':
guard block.
Because child processes run from scratch and re-import __main__
, by re-executing setup_logging()
,
logger SocketHandler
can be setup automatically.
This also means that the same config can work with both multiprocessing.Process
and multiprocessing.Pool
magically without user doing anything special.
Below is a minimal example:
import time
from random import randint
from multiprocessing import Process
from logger_tt import setup_logging, logger
setup_logging(use_multiprocessing=True) # for Windows, this line must be outside of guard block
def worker(arg):
logger.info(f'child process {arg}: started')
time.sleep(randint(1,10)) # imitate time consuming process
logger.info(f'child process {arg}: stopped')
if __name__ == '__main__':
all_processes = []
logger.info('Parent process is ready to spawn child')
for i in range(3):
p = Process(target=worker, args=(i,))
all_processes.append(p)
p.daemon = True
p.start()
for p in all_processes:
p.join()
The content of log.txt
should be similar to below:
[2020-10-28 20:39:14] [root:129 DEBUG] _________________New log started__________________
[2020-10-28 20:39:17] [root:130 DEBUG] Log config file: D:\my_project\log_config.json
[2020-10-28 20:39:17] [root:131 DEBUG] Logging server started!
[2020-10-28 20:39:22] [__main__:28 INFO] Parent process is ready to spawn child
[2020-10-28 20:39:22] [__mp_main__:16 INFO] Process-3 child process 2: started
[2020-10-28 20:39:22] [__mp_main__:16 INFO] Process-2 child process 1: started
[2020-10-28 20:39:22] [__mp_main__:16 INFO] Process-1 child process 0: started
[2020-10-28 20:39:23] [__mp_main__:18 INFO] Process-2 child process 1: stopped
[2020-10-28 20:39:23] [__mp_main__:18 INFO] Process-3 child process 2: stopped
[2020-10-28 20:39:24] [__mp_main__:18 INFO] Process-1 child process 0: stopped
Note: Under linux, to use queueHandler
, you must pass use_multiprocessing="fork"
to setup_logging
.
Other options True
, spawn
, forkserver
will use socketHandler
by default.
This is to prevent you set_start_method
as spawn
under linux and thus queueHandler
won't work.
Socket Address: socketHandler
will use tcp localhost
and port 9020
by default.
In the rare cases where you run multiple multiprocessing applications with logger_tt
,
the Address already in use
error will be raised. In such cases, you have to set the address manually.
setup_logging(host='localhost', port=6789)
You can omit the host
if you use "localhost"
.
You can also set this in the log config file for each application.
8. Temporary disable logging:
Some block of code contain critical information, such as password processing, that should not be logged.
You can disable logging for that block with a logging_disabled
context:
from logger_tt import logging_disabled, getLogger
logger = getLogger(__name__)
logger.debug('Begin a secret process')
with logging_disabled():
logger.info('This will not appear in any log')
logger.debug('Finish')
9. Limit traceback line's length:
Sometimes the variable on the exception line can hold enormous amount of data, such as content of some huge json file or html. In this case, printing out the whole content of the variable is quite point less and hinders debugging process as it hides away exception line.
So we should limit the character to be printed out in each line of the traceback. And we can do it as simple as follow:
setup_logging(limit_line_length=1000)
The default limit is 1000 characters. All left characters will be replaced with ...
.
limit_line_length=0
means no limit at all, prints the content of variable as is.
Note: if you input a float
, it will be round down to nearest int
.
A negative input is treated as inputting 0
.
For demonstration purpose, the example below will limit to 100
characters:
from logger_tt import setup_logging
setup_logging(limit_line_length=100)
def will_fail():
loren_ipsum = "On the other hand, we denounce with righteous indignation and dislike men who are so beguiled and " \
"demoralized by the charms of pleasure of the moment, so blinded by desire, that they cannot " \
"foresee the pain and trouble that are bound to ensue; and equal blame belongs to those who fail in " \
"their duty through weakness of will, which is the same as saying through shrinking from toil and " \
"pain. These cases are perfectly simple and easy to distinguish. In a free hour, when our power of " \
"choice is untrammelled and when nothing prevents our being able to do what we like best, " \
"every pleasure is to be welcomed and every pain avoided. But in certain circumstances and owing to " \
"the claims of duty or the obligations of business it will frequently occur that pleasures have to " \
"be repudiated and annoyances accepted. The wise man therefore always holds in these matters to " \
"this principle of selection: he rejects pleasures to secure other greater pleasures, or else he " \
"endures pains to avoid worse pains. "
print(f'Below is the {random} text used as a standard to test font: \n{loren_ipsum}')
if __name__ == '__main__':
will_fail()
It will output the follow traceback. Pay attention to the loren_ipsum
variable.
[2021-06-19 17:40:39] ERROR: Uncaught exception:
Traceback (most recent call last):
File "D:\my_project\long_line.py", line 21, in <module>
will_fail()
File "D:\my_project\long_line.py", line 18, in will_fail
print(f'Below is the {random} text used as a standard to test font: \n{loren_ipsum}')
|-> loren_ipsum = 'On the other hand, we denounce with righteous indignation and dislike men wh... (922 characters more)
NameError: name 'random' is not defined
10. Analyze raise
exception line:
If the code explicitly raise
an exception, in most cases,
the variables on the line are substituted and printed out at the end of traceback.
With logger-tt
analyzing the raise
statement, these variables are printed again too.
[2021-06-19 18:15:01] ERROR: Uncaught exception:
Traceback (most recent call last):
File "D:\my_project\module.py", line 9, in <module>
raise RuntimeError(f'Too much laughing with a={a} and b={b}')
|-> a = 'haha'
|-> b = 'hihi'
RuntimeError: Too much laughing with a=haha and b=hihi
The duplication is unnecessary, so from version 1.6.1
, raise
exception line will not be analyzed as default.
This resulted in a much cleaner log:
[2021-06-19 18:15:30] ERROR: Uncaught exception:
Traceback (most recent call last):
File "D:\my_project\module.py", line 9, in <module>
raise RuntimeError(f'Too much laughing with a={a} and b={b}')
RuntimeError: Too much laughing with a=haha and b=hihi
If the raise
exception line in turn, raise another exception, and you want to analyze it,
you could turn it back on as below:
setup_logging(analyze_raise_statement=True)
11. StreamHandler with buffer:
This handler is mainly to solve the problem of outputting a tremendous amount of logs to GUI applications in real-time.
GUI applications use threading to display content while listening for user input (button click, key pressing, mouse scroll). But since cpython actually running only one thread at a time due to the GIL (global interpreter lock), processing to display a tremendous amount of logs to the GUI widget will lock a thread for quite a long time. During this time, no user input will be handled and the app seems unresponsive.
The answer to this problem is to cache the log and output them at once after some interval or a number of cached lines reached a threshold.
This significantly reduces the overhead on the widget side and makes the app responsive.
The solution is implemented in the new StreamHandlerWithBuffer
which is inside logger_tt.handlers
.
There are 2 steps to use this handler.
-
config the handler in the
log_config
file.handlers: buffer_stream_handler: class: logger_tt.handlers.StreamHandlerWithBuffer level: DEBUG formatter: brief stream: ext://sys.stdout buffer_time: 0.5 buffer_lines: 0 debug: False root: level: DEBUG handlers: [console, error_file_handler, buffer_stream_handler]
Its parameters look exactly like the
console
handler except the last 3 ones.buffer_time
: the cache time interval in seconds before it flush the log outbuffer_line
: the number of line to cache before it flush the log outdebug
: log the time that it flush the log out or not
For
buffer_line
, to avoid the last lines of log not printed out as the number of line is below threshold, you should setbuffer_time
to a certain number too.Then, you need to add this handler to the
root
logger'shandlers
list. -
replace the
stream
: you need to replace thestdout
with your GUI widget stream. You cannot do this in the config file since your widget is only appear during runtime. You have to do this in the code.config = setup_logging(config_path='log_config.json') config.replace_handler_stream(index=HANDLER_INDEX, stream=WIDGET_STREAM)
Setup your logging as usual with your config file, then call
replace_handler_stream
to replace the with your widget's stream.index
: the index of the handler, in the root logger'handlers
list, that you want to replace the streamstream
: the stream that you want to put into this handler.
Below is the example with PySimpleGUI v4.57.0
with the above config.
import time
from threading import Thread
import PySimpleGUI as sg
from logger_tt import setup_logging, logger
stop_flag = False
# GUI config
sg.theme('DarkAmber')
layout = [
[[sg.Button("Show Log", key="-show_log-"),
sg.Button("stop", key="-stop-", button_color='red')],
sg.Multiline(size=(80, 30), font='Courier 10', key='log', autoscroll=True)]
]
window = sg.Window('Logging tool', layout, finalize=True)
# logging config
config = setup_logging(config_path='log_config.json')
config.replace_handler_stream(index=2, stream=window["log"])
def my_func():
"""long running task in the background"""
while not stop_flag:
for i in range(1000):
logger.warning(f" {i} Function is empty")
time.sleep(1)
while True:
event, values = window.read()
if event == sg.WINDOW_CLOSED:
break
if event == "-show_log-":
logger.info(__name__)
Thread(target=my_func).start()
if event == "-stop-":
stop_flag = True
logger.info(f"stop button pressed")
window.close()
You could set index=0
to use the normal StreamHandler
and
see the difference while clicking the stop
button for yourself.
12. Telegram Handler:
This handler enables you to send log messages directly to telegram users or groups.
For telegram groups, you can specify a certain topic
to send to, too.
This handler uses web API, so there is no third-party dependency.
To set up this handler, you need the following information:
- Your bot
token
: if you don't have one, create a new bot with https://t.me/botfather. - Destination
unique_id
: achat_id
(user id or group id) and optionallymessage_thread_id
of a topic in that group. You can chat with or add @RawDataBot to your group to get these ids. - Log level to be sent: above a level or only a specific level.
From here you have 2 options, put the token
and unique_id
directly in the config file or in the environment.
If you specify both ways, if the data exists in the environment variables,
it will replace the one specified in the config file. The default environment variable names are:
- token:
TELEGRAM_BOT_LOG_TOKEN
- unique_ids:
TELEGRAM_BOT_LOG_DEST
These above names are specified in env_token_key
and env_unique_ids_key
in the default config file.
You may edit them to suit your environment.
For the values, unique_ids
accepts the format [name:]chat_id[@message_thread_id]
,
multiple values must be separated by a semicolon (space after a semicolon will be ignored).
Which means the following examples are possible:
- a single chat_id:
123456789
(user id) or-987654321
(group id) - a specified topic within a group:
-987654321@2
- multiple values:
123456789; 102345678; -987654321@2; -987654322@4
- multiple values with names:
Alex:123456789; Bob:102345678; support:-987654321@2; admin:-987654322@4
After having all needed information, the next step is configuring the handler and adding it into the root
logger.
handlers:
telegram_handler:
class: logger_tt.handlers.TelegramHandler
level: NOTICE
formatter: brief
debug: False
token: ""
unique_ids: ""
env_token_key: "TELEGRAM_BOT_LOG_TOKEN",
env_unique_ids_key: "TELEGRAM_BOT_LOG_DEST"
root:
level: DEBUG
handlers: [console, error_file_handler, telegram_handler]
Sending too many messages within a second will lead to HTTP 429
error.
Even though it will resend later, you can avoid the error from the beginning by
adding the param grouping_interval: 1
to the configuration above.
By doing that, all log messages whose timestamp are in the same second will be sent as one telegram message.
From here, it should already work.
If you need certain messages to go to a certain people/group, besides adding a new handler,
you can add a filter that adds the dest_name
attribute to the log record
.
def telegram_filter(record):
if 'over threshold' in record.msg:
record.dest_name = 'support'
elif 'unauthorized' in record.msg:
record.dest_name = 'admin'
elif 'Alex' in record.msg:
record.dest_name = 'Alex'
else:
pass
# return False will discard this record
return True
log_config = setup_logging()
log_config.set_context_injector(telegram_filter)
logger.warning(f'Memory usage is over threshold')
logger.error(f'This deleting action is unauthorized')
logger.notice(f"Alex's files are ready to be collected")
dest_name
should be only one name that has been registered in unique_ids
.
If the name is not registered, the log record is simply ignored totally.
If you want to send to multiple people, create a telegram group for them and registered the group name.
Sample config:
Below are default config files that used by logger-tt
. You can copy and modify them as needed.
1. Yaml format:
log_config.yaml:
# This is an example of config file
# In case of no config provided, log_config.json file will be loaded
# If you need a yaml file, install pyyaml or ruamel.yaml package and copy this file
version: 1
disable_existing_loggers: False
formatters:
simple:
format: "[%(asctime)s] [%(name)s:%(lineno)d %(levelname)s] %(message)s"
datefmt: "%Y-%m-%d %H:%M:%S"
brief:
format: "[%(asctime)s] %(levelname)s: %(message)s"
datefmt: "%Y-%m-%d %H:%M:%S"
handlers:
console:
class: logging.StreamHandler
level: INFO
formatter: brief
stream: ext://sys.stdout
error_file_handler:
class: logging.handlers.TimedRotatingFileHandler
level: DEBUG
formatter: simple
filename: logs/log.txt
backupCount: 15
encoding: utf8
when: midnight
buffer_stream_handler:
class: logger_tt.handlers.StreamHandlerWithBuffer
level: DEBUG
formatter: brief
stream: ext://sys.stdout
buffer_time: 0.5
buffer_lines: 0
debug: False
telegram_handler:
class: logger_tt.handlers.TelegramHandler
level: NOTICE
formatter: brief
debug: False
token: "your bot token here or set the below env key to fetch from environ for better security"
unique_ids: "semicolon separated of [name:]chat_id[@message_thread_id]"
env_token_key: "TELEGRAM_BOT_LOG_TOKEN"
env_unique_ids_key: "TELEGRAM_BOT_LOG_DEST"
loggers:
urllib3:
level: WARNING
handlers: [console, error_file_handler]
propagate: no
root:
level: DEBUG
handlers: [console, error_file_handler]
logger_tt:
suppress: ["exchangelib"]
suppress_level_below: "WARNING"
capture_print: False
strict: False
guess_level: False
full_context: 0
use_multiprocessing: False
limit_line_length: 1000
analyze_raise_statement: False
default_logger_formats:
normal: ["%(name)s", "%(filename)s"]
thread: ["%(message)s", "%(threadName)s %(message)s"]
multiprocess: ["%(message)s", "%(processName)s %(message)s"]
both: ["%(message)s", "%(processName)s %(threadName)s %(message)s"]
2. Json format:
log_config.json:
{
"version": 1,
"disable_existing_loggers": false,
"formatters": {
"simple": {
"format": "[%(asctime)s] [%(name)s:%(lineno)d %(levelname)s] %(message)s",
"datefmt": "%Y-%m-%d %H:%M:%S"
},
"brief": {
"format": "[%(asctime)s] %(levelname)s: %(message)s",
"datefmt": "%Y-%m-%d %H:%M:%S"
}
},
"handlers": {
"console": {
"class": "logging.StreamHandler",
"level": "INFO",
"formatter": "brief",
"stream": "ext://sys.stdout"
},
"error_file_handler": {
"class": "logging.handlers.TimedRotatingFileHandler",
"level": "DEBUG",
"formatter": "simple",
"filename": "logs/log.txt",
"backupCount": 15,
"encoding": "utf8",
"when": "midnight"
},
"buffer_stream_handler": {
"class": "logger_tt.handlers.StreamHandlerWithBuffer",
"level": "INFO",
"formatter": "simple",
"stream": "ext://sys.stdout",
"buffer_time": 0.5,
"buffer_lines": 0,
"debug": false
},
"telegram_handler": {
"class": "logger_tt.handlers.TelegramHandler",
"level": "NOTICE",
"formatter": "brief",
"debug": false,
"token": "your bot token here or set the below env key to fetch from environ for better security",
"unique_ids": "semicolon separated of [name:]chat_id[@message_thread_id]",
"env_token_key": "TELEGRAM_BOT_LOG_TOKEN",
"env_unique_ids_key": "TELEGRAM_BOT_LOG_DEST"
}
},
"loggers": {
"urllib3": {
"level": "ERROR",
"handlers": ["console", "error_file_handler"],
"propagate": false
}
},
"root": {
"level": "DEBUG",
"handlers": ["console", "error_file_handler"]
},
"logger_tt": {
"suppress": ["exchangelib"],
"suppress_level_below": "WARNING",
"capture_print": false,
"strict": false,
"guess_level": false,
"full_context": 0,
"use_multiprocessing": false,
"limit_line_length": 1000,
"analyze_raise_statement": false,
"default_logger_formats": {
"normal": ["%(name)s", "%(filename)s"],
"thread": ["%(message)s", "%(threadName)s %(message)s"],
"multiprocess": ["%(message)s", "%(processName)s %(message)s"],
"both": ["%(message)s", "%(processName)s %(threadName)s %(message)s"]
}
}
}
Changelog
1.7.3:
- Usability:
- Not to import custom handlers (StreamHandlerWithBuffer, TelegramHandler, etc) if they are not used in any logger.
- TelegramHandler:
- Better network error handling.
- Added
grouping_interval
to group many log messages that are within the samex
seconds interval into one before sending. This reduces the number of time it sends messages to Telegram server and helps to avoid 429 error.
1.7.2:
- Fixed: TelegramHandler crashed instead of ignoring the unregistered
unique_id
1.7.1
- Fixed: exception raised while handling another exception is now shown correctly (thank ZeroRin).
- New functionality:
- Added
TelegramHandler
. Now you can send logs directly to telegram users/groups. - Support Python 3.11
Fine-grained error locations
in tracebacks.
- Added
- Usability:
- Added level NOTICE = INFO + 5. You can do
logger.notice("your message")
. - Add set/remove
context injector
methods. You can add additional information to the log record before it is actually handled. Refer to theTelegramHandler
for a usage sample. - You can now set different log paths for different handlers by passing a dict to
setup_logging
(thank ZeroRin).
- Added level NOTICE = INFO + 5. You can do
1.7.0
-
Fixed:
- multiprocessing: log file rollover fails as child process keep opening the file.
- multiprocessing: if the log path is set by a variable with time, child process creates a new redundant log path.
-
New functionality: Added
StreamHandlerWithBuffer
. Buffer the log output by time or by line number. GUI app could use this handler to keep the app responsive while having a tremendous log output. -
Usability: In multiprocessing logging, users can set the log server address themselves through
setup_logging
or log config file.
1.6.1
-
Added
limit_line_length
parameter: log only maximumn
characters for each traceback line. This prevents dumping the whole huge content of the variable into the log.n=1000
by default. -
Added
analyze_raise_statement
parameter:logger-tt
no longer analyze theraise
statement by default. This avoids logging value of variables on theraise
statement two time, especially when the content of these variables are huge.
1.6.0
-
Fixed: If an exception happened on the multiline statement, py3.6 and py3.7 return the last line while py3.9 returns the first line. Plus the
tokenize
module's behavior has changed, so it made grabbing the all the lines of the statement inconsistent and sometime buggy. Nowlogger-tt
only grabs maximum of 10 lines and grabs more accurately, more consistent between different python version. -
Added support for
ruamel.yaml
package. If you already have it installed, you don't need to installpyyaml
to useconfig.yaml
file -
New feature: Uncaught exception happened in child thread of multi-threading program will also be logged. For python 3.8+,
threading.excepthook
will not run as the exception is already caught bylogger-tt
.
1.5.2
Improved the pre-made logger named logger_tt
-
logger_tt
now can detect the qualified__name__
of the module that calls it. Instead offilename
, output log line will have the__name__
as regular logger.For example:
[2020-07-21 11:24:19] [my_module.py:5 DEBUG] Module is initialized [2020-07-21 11:24:19] [sub_module.py:15 DEBUG] Entering sub module
Now becomes
[2020-07-21 11:24:19] [__main__:5 DEBUG] Module is initialized [2020-07-21 11:24:19] [my_module.submodule:15 DEBUG] Entering sub module
-
Suppressing loggers also works with log records output by
logger_tt
by using the qualified__name__
too. For example, suppressingmy_module.submodule
will telllogger_tt
not to output the second line.This is much better than suppressing
logger_tt
if you use this same logger in other modules too. -
You now can define fields of log record for
logger_tt
in the log config file too. Just looks fordefault_logger_formats
section. It works by replacing the field in the formatters that are used by any handler of the root logger.
Pre-existing loggers:
Before this version, if you import submodules before importing logger_tt
and
there are loggers in submodules, these loggers do not inspect exception when you call logger.exception()
.
That is because there class was different from the loggers created after importing logger_tt
.
Now all loggers have the same new class regardless the point of importing logger_tt
.
setup_logging(): This function should only be called once. Add a warning if it is called more than one time.
1.5.1
- Use
socketHandler
as default for multiprocessing. Under linux, to usequeueHandler
, user must passuse_multiprocessing="fork"
tosetup_logging
- Expose
logging_disabled
function to user:from logger_tt import logging_disabled
. Then this function can be used as a context withwith
statement. - For convenient, user can import a pre-made
logger
fromlogger_tt
to use right away in sub modules. The built-ingetLogger
function can be imported fromlogger_tt
, too. - Added line number to a default
simple
log record formatter in the config file. - Most parameters of
setup_logging()
function can be specified in the config file, too. If the same parameter is specified in bothsetup_logging()
function and in the config file, the parameter passed insetup_logging()
will be used.
1.5.0
- Logging is off-loaded to another thread and uses Queue to communicate. This allow critical thread can do there job why time-consuming logging can be done later or in parallel.
- Support for multiprocessing logging. For linux, a multiprocessing queue is used. For Windows and macOS, a socket server is used instead.
setup_logging
now return aLogConfig
object. You can set/change parameters of this object instead of passing arguments directly tosetup_logging
.
Onlyconfig_path
,log_path
anduse_multiprocessing
argument must be set withsetup_logging
.
Behaviors changed:
full_context
is now anint
that indicate the depth level from the bottom, where surrounding variables should be parsed.- Turned off parsing full context for
raise
exception since many exception names are enough to understand the problem. log_config
file: movesuppress
section intologger_tt
section. Future settings will also be put into this section for the sake of managing. If you need to hanging the logging framework, you just need to delete this section and move on.
1.4.2
To prevent exception during logging, the following actions have been applied:
- Catch exception while parsing for object's value (property of a class)
- Catch exception while evaluating
__repr__
and__str__
of object - Disable logging while inspecting objects' value and representation
- Disable logging after an uncaught exception is logged.
Because the interpreter is shutting down, objects get deleted.
Logging put inside magic function
__del__
will raise error.
1.4.1
- Fix
print_capture
ignoringprint()
line in global scope due to lackingcode_context
frame - If
__str__
of an object has multiple lines, also indent the second line and so on accordingly. - If there is an exception during getting object's representation,
return
!!! Attribute error
instead ofError in sys.excepthook
1.4.0
- Add an extra field
suppress
in config file. Any logger's name appeared in this list will have its messages suppressed.
1.3.2
- change extended ascii dash
─
to normal dash-
so that it is displayed consistently in different encoding
1.3.1
- change extended ascii vertical bar
├
to normal bar|
so that it is displayed consistently in different encoding
1.3.0
- Exception analyzing now fetch full multi-line python statement.
This means that variables lie at seconds and below of the same statement can also be seen
without the need of
full_context=True
.
1.2.1
- Extend logging context to
logger.exception()
as well. Now you can dotry-except
a block of code and still have a full context at error line.
1.2.0
- Add logging context for uncaught exception. Now automatically log variables surrounding the error line, too.
- Add test cases for logging exception
1.1.1
- Fixed typos and grammar
- Add config file sample to README
- using full name
log_config.json
instead oflog_conf.json
, the same for yaml file - add test cases for
capture print
1.1.0
- Add
capture print
functionality withguess level
for the message.
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