philiprehberger-struct-log 0.2.1

Structured JSON logging with automatic context propagation.

philiprehberger-struct-log

Structured JSON logging with automatic context propagation.

Installation

pip install philiprehberger-struct-log

Usage

Basic logging

from philiprehberger_struct_log import get_logger

logger = get_logger("myapp")
logger.info("Server started", extra={"port": 8080})
# {"timestamp": "2026-03-21T12:00:00+00:00", "level": "INFO", "message": "Server started", "logger": "myapp", "port": 8080}

Context propagation

from philiprehberger_struct_log import get_logger, bind_context, clear_context

logger = get_logger("myapp")

bind_context(request_id="abc-123", user="alice")
logger.info("Processing request")
# {"timestamp": "...", "level": "INFO", "message": "Processing request", "logger": "myapp", "request_id": "abc-123", "user": "alice"}

clear_context()

Scoped context

Use log_context as a context manager for nested scoped context. On exit, the previous context is automatically restored.

from philiprehberger_struct_log import get_logger, log_context

logger = get_logger("myapp")

with log_context(request_id="abc"):
    logger.info("handling")  # includes request_id
    with log_context(user_id="123"):
        logger.info("auth")  # includes request_id AND user_id
    logger.info("done")  # only request_id

Inspecting context

from philiprehberger_struct_log import bind_context, get_context

bind_context(service="api", env="production")
ctx = get_context()
# {"service": "api", "env": "production"}

API

Name	Description
get_logger(name)	Get or create a logger with a StructHandler attached. Level is set to DEBUG.
bind_context(**kwargs)	Store key-value pairs in thread-local context. Included in every log entry on the current thread.
clear_context()	Clear all bound context for the current thread.
get_context()	Return a copy of the current thread-local context as a dict.
log_context(**kwargs)	Context manager that merges kwargs into context on enter and restores previous context on exit. Supports nesting.
StructHandler(stream=None)	Logging handler that formats records as JSON lines. Defaults to stderr.

JSON output fields

Field	Description
timestamp	ISO 8601 UTC timestamp
level	Log level name (DEBUG, INFO, WARNING, ERROR, CRITICAL)
message	Formatted log message
logger	Logger name

Bound context fields and any extra={} kwargs passed to the log call are merged into the top-level JSON object.

Development

pip install -e .
python -m pytest tests/ -v

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License

MIT