Minimal logging setup with utilities to represent interpreter stacks.
Project description
Yogger
Yogger provides a minimal logging setup with utilities to represent interpreter stacks.
Supports
requests.Request
andrequests.Response
objects if the Requests package is installed.
Example of common usage:
import logging
import yogger
logger = logging.getLogger(__name__)
def main():
yogger.install()
yogger.configure(__name__, verbosity=2, dump_locals=True)
with yogger.dump_on_exception():
# Code goes here
if __name__ == "__main__":
main()
Requirements:
Yogger requires Python 3.9 or higher, is platform independent, and has no outside dependencies.
Issue reporting
If you discover an issue with Yogger, please report it at https://github.com/Phosmic/yogger/issues.
License
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.
Installing
Most stable version from PyPi:
python3 -m pip install yogger
Development version from GitHub:
git clone git+https://github.com/Phosmic/yogger.git
cd yogger
python3 -m pip install -e .
Usage
Import packages and instantiate a logger:
import logging
import yogger
logger = logging.getLogger(__name__)
Install the logger class and configure with your package name:
Place at the start of the top-level function.
def main():
yogger.install()
yogger.configure(__name__)
# Code goes here
Output
Example of logger output:
[ 2023-01-17 10:16:09.0918 INFO my_package ] Something we want to log.
[ 2023-01-17 10:16:09.0918 DEBUG my_package ] Something we want to log.
[ 2023-01-17 10:16:09.0918 WARNING my_package ] Something we want to log.
[ 2023-01-17 10:16:09.0918 ERROR my_package ] Something we want to log.`
[ 2023-01-17 10:16:09.0918 CRITICAL my_package ] Something we want to log.
Note: Support for rich text has not yet been added for Windows platforms.
Support for dumping the stack
Traces and exceptions
Using the dump_on_exception
context manager dumps the exception and trace if an exception is raised:
with yogger.dump_on_exception(
# Uncomment to override
# dump_path="./stack_dump.txt",
):
raise SomeException
This is nearly equivalent to:
import inspect
try:
raise SomeException
except Exception as e:
trace = inspect.trace()
if len(trace) > 1:
with open("./stack_dump.txt", mode="a", encoding="utf-8") as f:
yogger.dump(f, trace[1:], e=e, package_name="my_package")
Stacks
Setting dump_locals=True
when running yogger.configure
dumps a representation of the caller's stack upon logging with a level of warning or higher.
To manually dump the stack, something like this would suffice:
import inspect
stack = inspect.stack()
if len(stack) > 2:
with open("./example.log", mode="w", encoding="utf-8") as fp:
yogger.dump(fp, stack[2:][::-1])
If you simply want the string representation, use the yogger.dumps
function:
stack = inspect.stack()
if len(stack) > 2:
trace_repr = yogger.dumps(stack[2:][::-1])
Output
Example of dictionary representation in dump:
example = {
"user_id": 123456790,
"profile": {
"name": "John Doe",
"birthdate": datetime.date(2000, 1, 1),
"weight_kg": 86.18,
},
"video_ids": [123, 456, 789],
}
example = <builtins.dict>
example['user_id'] = 123456790
example['profile'] = <builtins.dict>
example['profile']['name'] = 'John Doe'
example['profile']['birthdate'] = datetime.date(2000, 1, 1)
example['profile']['weight_kg'] = 86.18
example['video_ids'] = [123, 456, 789]
Similarly for a dataclass:
@dataclasses.dataclass
class Example:
user_id: int
profile: dict[str, str | float | datetime.date]
video_ids: list[int]
example = <my_package.Example>
example.user_id = 'user_id' = example.user_id = 123456790
example.profile = 'profile' = example.profile = <builtins.dict>
example.profile['name'] = 'John Doe'
example.profile['birthdate'] = datetime.date(2000, 1, 1)
example.profile['weight_kg'] = 86.18
example.video_ids = 'video_ids' = example.video_ids = [123, 456, 789]
Library
About the package_name
parameter
The package_name
parameter gives Yogger an idea of what belongs to your application. This name is used to identify which frames to dump in the stack. So it’s important what you provide there. If you are using a single module, __name__
is always the correct value. If you are using a package, it’s usually recommended to hardcode the name of your package there.
For example, if your application is defined in "my_package/app.py", you should create it with one of the two versions below:
yogger.configure("my_package")
yogger.configure(__name__.split(".")[0])
Why is that? The application will work even with __name__
, thanks to how resources are looked up. However, it will make debugging more painful. Yogger makes assumptions based on the import name of your application. If the import name is not properly set up, that debugging information may be lost.
yogger.install
Function to install the logger class and instantiate the global logger.
Function Signature |
---|
install() |
Parameters |
---|
Empty |
yogger.configure
Function to prepare for logging.
Function Signature |
---|
configure(package_name, *, verbosity=0, dump_locals=False, dump_path=None, remove_handlers=True) |
Parameters | |
---|---|
package_name(str) | Name of the package to dump from the stack. |
verbosity(int) | Level of verbosity (0-2) for log messages. |
dump_locals(bool) | Dump the caller's stack when logging with a level of warning or higher. |
dump_path(str | bytes | os.PathLike | None) | Custom path to use when dumping with dump_on_exception or when dump_locals=True , otherwise use a temporary path if None. |
remove_handlers(bool) | Remove existing logging handlers before adding the new stream handler. |
yogger.dump_on_exception
Context manager to dump a representation of the exception and trace stack to file if an exception is raised.
Function Signature |
---|
dump_on_exception(dump_path=None) |
Parameters | |
---|---|
dump_path(str | bytes | os.PathLike | None) | Override the file path to use for the dump. |
yogger.dump
Function to write the representation of an interpreter stack using a file object.
Function Signature |
---|
dump(fp, stack, *, e=None, package_name=None) |
Parameters | |
---|---|
fp(io.TextIOBase | io.BytesIO) | File object to use for writing. |
stack(list[inspect.FrameInfo]) | Stack of frames to dump. |
e(Exception | None) | Exception that was raised. |
package_name(str | None) | Name of the package to dump from the stack, otherwise non-exclusive if set to None. |
yogger.dumps
Function to create a string representation of an interpreter stack.
Function Signature |
---|
dumps(stack, *, e=None, package_name=None) |
Parameters | |
---|---|
stack(list[inspect.FrameInfo]) | Stack of frames to represent. |
e(Exception | None) | Exception that was raised. |
package_name(str | None) | Name of the package to dump from the stack, otherwise non-exclusive if set to None. |
yogger.pformat
Function to create a string representation of a variable's name and value.
Function Signature |
---|
pformat(name, value) |
Parameters | |
---|---|
name(str) | Name of the variable to represent. |
value(str) | Value to represent. |
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