LogDNA Logrus and Logrus Mate library

This library allows logging to LogDNA from Logrus, optionally configuring everything using Logrus Mate.

This works for me, but is currently a work in progress.

Configuration

Check out the example/ subdirectory for a simple example.

You can create hook manually, New method or using Logrus Mate. For HOCON configuration provider (the default), add a hook like this:

your-logger {
    ...
    hooks {
        logdna {
            api-key = "your-ingestion-key-here"
            app = "myapp"
            json = true
        }
        ...
    }
    ...
}

The supported options are:

• api-key: ingestion key, mandatory
• hostname: hostname override, if not specified will use os.Hostname()
• mac: host MAC address, not sent if empty, no autodetection for now
• ip: host IP address, ditto
• app: app identifier, for LogDNA to filter
• env: environment identifier, for LogDNA to filter
• size: buffer size, in entries, defaults to 4096
• flush: flush interval, defaults to 10 seconds
• qsize: buffered channel size
• drop: whenever hook's allowed to drop messages (if buffer's full etc). Logging will block if this is false and there are size+qsize entries waiting to be sent.
• json: how to send structured log fields. Will format line as JSON if set to true (using "message" key for log message), or pass fields as meta if not.
• text-format: whenever to also include structured logging data in the message. Default to false, enabling will append key-value pairs to the message texts, so they'll be immediately visible.
• url allows to override the ignestion endpoint URL (e.g. for testing)

With New method and Config struct you have a little more flexibility, as you can specify any MessageFormatter rather than just text-format.

Limitations

As the logging is asynchronous, error handling is limited. If drop is set to true, you can lose messages on outages. If drop is false, program may panic at shutdown, or buffer size may grow past the size limit.

Also, to give the hooks chance flush before the program exits, don't forget to add defer logrus.Exit(0) to your main.

Suggestions (and pull requests) are welcomed.