Sirupsen/logrus

External

• https://github.com/sirupsen/logrus

Internal

• Go Open Source Packages
• Go Logging

Overview

Logrus is in maintenance-mode. From the author: I believe Logrus' biggest contribution is to have played a part in today's widespread use of structured logging in Golang. There doesn't seem to be a reason to do a major, breaking iteration into Logrus V2, since the fantastic Go community has built those independently. Many fantastic alternatives have sprung up. Logrus would look like those, had it been re-designed with what we know about structured logging in Go today. Check out, for example, Zerolog, Zap, and Apex.

Idioms

Constant String Logging

One field:

if err != nil {
    logger.WithError(err).WithField("field1", value1).Error("Constant string error message")
}

Multiple fields:

if err != nil {
    logger.WithError(err).WithFields(logrus.Fields{
        "field1":   value1,
        "field2":   value2
    }).Error("Constant string error message")
}