Rusty Logger

Simple, opinionated and fast python logging. Rusty-Logger is a thin python wrapper for Rust's tracing library that provides a mostly drop-in replacement for python's default logging.

Table of contents

• Supported configuration
• Constraints
• Additional metadata
• Code examples
• Additional examples
• Performance
• Contributing

Supported Configuration

Arg	Description	Default
stdout	Log to stdout	True
stderr	Log to stderr	False
level	Level to log	INFO
app_env	Application environment (APP_ENV env var)	development
lock_guard	Whether to lock logger to current context	False
thread_id	Whether to display the thread id	False
color	Whether to enable ansi coloring of logs for standard logger	False
time_format	Custom time format for logger	[year]-[month]-[day]T[hour repr:24]:[minute]:[second]::[subsecond digits:4]
json_config	JsonConig	None
json_config.flatten	Whether to flatten any passed fields	True
file_config	LogFileConfig	None
file_config.filename	Filename for log	log/logs.log
file_config.rotate	File rotation specification. daily, hourly, minutely or never	never

Constraints

Time is currently limited to UTC; however, you can customize time format to your liking using the time_format arg. Please refer to (time docs)[https://time-rs.github.io/book/api/format-description.html] for formatting guidelines. In addition, because Rusty-Logger calls Rust directly, it's not currently possible to pull the specific line number where logging takes place unless python is directly used (if you're even interested in this feature 😄). If you'd like to see this feature implemented, and you want to contribute, please refer to the contributing guide.

In addition, Rusty-Logger is a mostly drop-in replacement, meaning that you may need to make some minor changes to your existing code. For example, Rusty-Logger does not support current python lazy formatting (e.g. logger.info("Number: %s", 10)). Instead, Rusty-Logger uses Rust's default bracket ({}) formatting.

# This is not supported
logger.info("Number: %s", 10)

# This is supported
logger.info("Number: {}", 10)

Show Me The Code!

Basic Usage

from rusty_logger import Logger

logger = Logger.get_logger(__file__)
logger.info("Loggy McLogface")

output

2023-10-18T00:11:43::3194  INFO Loggy McLogface app_env="development" name="your_file.py"

JSON

from rusty_logger import Logger, LogConfig, JsonConfig

logger = Logger.get_logger(__file__, LogConfig(json_config=JsonConfig()))
logger.info("Loggy McLogface logs")

output

{"timestamp":"2023-10-18T00:10:59::9732","level":"INFO","message":"Loggy McLogface logs","app_env":"development","name":"your_file.py"}

Log to file

from rusty_logger import Logger, LogConfig, JsonConfig, LogLevel, LogFileConfig

logger = Logger.get_logger(
    name=__file__,
    config=LogConfig(
        stdout=False,
        level=LogLevel.WARN,
        json_config=JsonConfig(),
        file_config=LogFileConfig(filename="logs/test.log"),
    ),
)
logger.warning("Loggy McLogface logs logs")

output from log/test.log

{"timestamp":"2023-10-18T00:10:10::9364","level":"WARN","message":"Loggy McLogface logs logs","app_env":"development","name":"your_file.py"}

Record multiple places at once

from rusty_logger import Logger, LogConfig, JsonConfig, LogMetadata, LogLevel, LogFileConfig

logger = Logger.get_logger(
    __file__,
    LogConfig(
        stdout=True,
        level=LogLevel.ERROR,
        json_config=JsonConfig(),
        file_config=LogFileConfig(filename="logs/test.log")
    ),
)
logger.error("Loggy McLogface logs logs that are logs")

output

{"timestamp":"2023-10-18T00:09:32::4053","level":"ERROR","message":"Loggy McLogface logs logs that are logs","app_env":"development","name":"your_file.py"}

Additional examples

For additional examples, please see the examples directory which contains timed example of vanilla logger vs Rusty-Logger, python-json-logger vs Rusty-Logger as well as a multi-worker API example.

Performance

Why would we do this when python logging is fine? Because we wanted something faster 😄. From our own benchmarks, Rusty-Logger tends to be ~4x faster than vanilla python logging and ~8x faster than vanilla JSON logging. And while speed may not be mission critical for a few thousands logs, it can be for millions, which many companies deal with on a daily basis. Time is money and compute, and we want to save you both 💰 💻.

Contributing

While Rusty-Logger is production ready out of the box, it is still in it's infancy and is ripe for additional contributions. If you'd like to contribute, please see the contributing guide.

Thank You!!! ❤️ ❤️ ❤️