[core] Setup logger to be able to use logging in plugins

[Alxiice]

Description

• Adding prepareLogger and restoreLogger on the node, that can be used to setup and restore the root logger
• Update the LogManager to handle more than only the chunks
• Add trace log level to logging with an inferior level than debug (debug is 10 by default so trace would be 5 with this PR)
• Add new internal input "logLevel" to setup default logging level for the node

Now here's how we can use it

1. Using chunk.logger (previous way)

class TestNode(desc.Node):
    def processChunk(self, chunk):
        chunk.logManager.start(chunk.node.verboseLevel.value)
        chunk.logger.info   (f"Message with info    level ({chunk.logger})")
        chunk.logger.warning(f"Message with warning level ({chunk.logger})")
        chunk.logger.error  (f"Message with error   level ({chunk.logger})")
        chunk.logManager.end()

2. Using logging

import logging
logger = logging.getLogger("TestNode2")

def print_info():
    logger.info   (f"Message with info    level ({logger})")
    logger.warning(f"Message with warning level ({logger})")
    logger.error  (f"Message with error   level ({logger})")

class TestNode2(desc.Node):
    def processChunk(self, chunk):
        logger.setLevel(chunk.node.verboseLevel.value.upper())
        print_info()

[codecov]

Codecov Report

❌ Patch coverage is 92.36111% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.02%. Comparing base (e704e5b) to head (4e8bb22).
⚠️ Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
meshroom/core/node.py	86.79%	7 Missing ⚠️
meshroom/__init__.py	71.42%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2845      +/-   ##
===========================================
+ Coverage    77.79%   79.02%   +1.22%     
===========================================
  Files           50       51       +1     
  Lines         6725     6856     +131     
===========================================
+ Hits          5232     5418     +186     
+ Misses        1493     1438      -55     

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[fabiencastan]

I would like to simply it a bit more, like this:

import logging

def print_info():
    logging.info   (f"Message with info    level ({logger})")
    logging.warning(f"Message with warning level ({logger})")
    logging.error  (f"Message with error   level ({logger})")

class TestNode2(desc.Node):
    def processChunk(self, chunk):
        logging.getLogger().setLevel(chunk.node.verboseLevel.value.upper())
        print_info()

So if we call any 3rd party python code, the logging behavior will be correct.

And maybe in another PR, move the verbose param as a default param, so we can configure it by default.

[Alxiice]

@fabiencastan

So if we call any 3rd party python code, the logging behavior will be correct.

Actually I tested and with the code you provided it works already

And maybe in another PR, move the verbose param as a default param, so we can configure it by default.

You mean as an internalInput ?

[fabiencastan]

You mean as an internalInput ?

Yes

[Copilot]

Pull Request Overview

This PR introduces comprehensive logging infrastructure improvements to enable plugins to use Python's standard logging module alongside the existing chunk-based logging system. The main goal is to expand logging capabilities beyond just chunk processing to support broader node-level and plugin logging.

• Refactors the LogManager class to work with any logger and log file, not just chunks
• Adds a new trace logging level below debug for more granular debugging
• Introduces prepareLogger/restoreLogger methods on nodes for setting up root logger configuration
• Adds a new internal input parameter for configuring default node logging levels

Reviewed Changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/test_compute.py	Comprehensive test suite for the new logging functionality with chunked and non-chunked nodes
meshroom/core/nodeFactory.py	Prevents conflicts between user inputs and internal inputs by filtering duplicates
meshroom/core/node.py	Major refactoring of LogManager and addition of node-level logging methods
meshroom/core/desc/node.py	Adds new nodeDefaultLoglevel internal parameter for configuring logging levels
meshroom/init.py	Implements custom TRACE logging level and updates logging level mappings

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[cbentejac]

Everything works as expected, the requested changes are mostly cosmetic.

[cbentejac]

Is this necessary, since the internal input for the logger doesn't have (and isn't likely to ever have) the same name as an input parameter?

[Alxiice]

It shouldn't be necessary, but I still think this is better to have this protection, because having twice the same keyword arg in the call of Node(...) will always raise an error.