ecs-logging-python

Please note that this is library is in a beta version and backwards-incompatible changes might be introduced in future releases. While we strive to comply to semver, we can not guarantee to avoid breaking changes in minor releases.

Check out the Elastic Common Schema (ECS) reference for more information.

The library currently implements ECS 1.5, after a 1.x version is released we will be following (ECS.major).(ECS.minor).(package minor) as our versioning scheme.

Installation

$ python -m pip install ecs-logging

Getting Started

ecs-logging-python has formatters for the standard library logging module and the structlog package.

Standard Library logging Module

import logging
import ecs_logging

# Get the Logger
logger = logging.getLogger("app")
logger.setLevel(logging.DEBUG)

# Add an ECS formatter to the Handler
handler = logging.StreamHandler()
handler.setFormatter(ecs_logging.StdlibFormatter())
logger.addHandler(handler)

# Emit a log!
logger.debug("Example message!", extra={"http.request.method": "get"})

{
    "@timestamp": "2020-03-20T18:11:37.895Z",
    "ecs": {
        "version": "1.5.0"
    },
    "http": {
      "request": {
        "method": "get"
      }
    },
    "log": {
        "level": "debug",
        "logger": "app",
        "origin": {
            "file": {
                "line": 14,
                "name": "test.py"
            },
            "function": "func"
        },
        "original": "Example message!"
    },
    "message": "Example message!"
}

Excluding Fields

You can exclude fields from being collected by using the exclude_fields option in the StdlibFormatter constructor:

from ecs_logging import StdlibFormatter

formatter = StdlibFormatter(
    exclude_fields=[
        # You can specify individual fields to ignore:
        "log.original",
        # or you can also use prefixes to ignore
        # whole categories of fields:
        "process",
        "log.origin",
    ]
)

Limiting Stack Traces

The StdlibLogger automatically gathers exc_info into ECS error.* fields. If you'd like to control the number of stack frames that are included in error.stack_trace you can use the stack_trace_limit parameter (by default all frames are collected):

from ecs_logging import StdlibFormatter

formatter = StdlibFormatter(
    # Only collects 3 stack frames
    stack_trace_limit=3,
)
formatter = StdlibFormatter(
    # Disable stack trace collection
    stack_trace_limit=0,
)

Structlog Example

import structlog
import ecs_logging

# Configure Structlog
structlog.configure(
    processors=[ecs_logging.StructlogFormatter()],
    wrapper_class=structlog.BoundLogger,
    context_class=dict,
    logger_factory=structlog.PrintLoggerFactory(),
)

# Get the Logger
logger = structlog.get_logger("app")

# Add additional context
logger = logger.bind(**{
    "http": {
        "version": "2",
        "request": {
            "method": "get",
            "bytes": 1337,
        },
    },
    "url": {
        "domain": "example.com",
        "path": "/",
        "port": 443,
        "scheme": "https",
        "registered_domain": "example.com",
        "top_level_domain": "com",
        "original": "https://example.com",
    }
})

# Emit a log!
logger.debug("Example message!")

{
  "@timestamp": "2020-03-26T13:08:11.728Z",
  "ecs": {
    "version": "1.5.0"
  },
  "http": {
    "request": {
      "bytes": 1337,
      "method": "get"
    },
    "version": "2"
  },
  "log": {
    "level": "debug"
  },
  "message": "Example message!",
  "url": {
    "domain": "example.com",
    "original": "https://example.com",
    "path": "/",
    "port": 443,
    "registered_domain": "example.com",
    "scheme": "https",
    "top_level_domain": "com"
  }
}

Elastic APM Log Correlation

ecs-logging-python supports automatically collecting ECS tracing fields from the Elastic APM Python agent in order to correlate logs to spans, transactions and traces in Elastic APM.

License

Apache-2.0