Created
July 7, 2017 21:51
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Trying to understand logging in Python with structlog...
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| # Two main things I can't figure out: | |
| # 1. How do I get the name of each function to prefix its log entry? | |
| # e.g., INFO:testmodule:outsideFun:{msg} instead of just INFO:testmodule:{msg} | |
| # 2. How do I get bound values to persist through subsequent functions? | |
| # e.g., user:matt.parker and outsideArg:foo should appear in both | |
| # outsideFun and insideFun log messages | |
| import logging | |
| import structlog | |
| import testmodule | |
| # Set up the log | |
| logging.basicConfig(level = logging.DEBUG) | |
| structlog.configure( | |
| processors = [structlog.stdlib.filter_by_level, | |
| structlog.processors.format_exc_info, | |
| structlog.processors.TimeStamper(fmt = 'iso'), | |
| structlog.processors.JSONRenderer()], | |
| context_class = dict, | |
| logger_factory = structlog.stdlib.LoggerFactory(), | |
| wrapper_class = structlog.stdlib.BoundLogger, | |
| cache_logger_on_first_use = True | |
| ) | |
| logger = structlog.get_logger() | |
| # Bind a key-value that should appear in all output | |
| logger = logger.bind(user = "matt.parker") | |
| # Run the function | |
| testmodule.outsideFun() |
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| import structlog | |
| module_logger = structlog.get_logger() | |
| def insideFun(insideArg = "bar"): | |
| logger = structlog.get_logger() | |
| logger = logger.bind(insideArg = insideArg) | |
| logger.info("Inside function has begun.") | |
| print insideArg | |
| logger.info("Inside function complete.") | |
| def outsideFun(outsideArg = "foo"): | |
| logger = structlog.get_logger() | |
| logger = logger.bind(outsideArg = outsideArg) | |
| logger.info("Starting the outside function...") | |
| insideFun() | |
| logger.info("Outside function complete.") | |
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