github.com/apex/log @v1.9.0

Package log implements a simple structured logging API inspired by Logrus, designed with centralization in mind. Read more on Medium.

Handlers

• apexlogs – handler for Apex Logs
• cli – human-friendly CLI output
• discard – discards all logs
• es – Elasticsearch handler
• graylog – Graylog handler
• json – JSON output handler
• kinesis – AWS Kinesis handler
• level – level filter handler
• logfmt – logfmt plain-text formatter
• memory – in-memory handler for tests
• multi – fan-out to multiple handlers
• papertrail – Papertrail handler
• text – human-friendly colored output
• delta – outputs the delta between log calls and spinner

Example

Example using the Apex Logs handler.

package main

import (
    "errors"
    "time"

    "github.com/apex/log"
)

func main() {
    ctx := log.WithFields(log.Fields{
        "file": "something.png",
        "type": "image/png",
        "user": "tobi",
    })

    for range time.Tick(time.Millisecond * 200) {
        ctx.Info("upload")
        ctx.Info("upload complete")
        ctx.Warn("upload retry")
        ctx.WithError(errors.New("unauthorized")).Error("upload failed")
        ctx.Errorf("failed to upload %s", "img.png")
    }
}