logging

A small logging package with env + programmatic configuration.

Levels

• DEBUG / INFO / WARN / ERROR
• Default is INFO (DEBUG is hidden)
• GOLOG_LOG_LEVEL=DEBUG shows all logs.

Output

GOLOG_OUTPUT supports: stdout, stderr, file, combined with +.

Examples:

• export GOLOG_OUTPUT="stderr"
• export GOLOG_OUTPUT="stderr+file"
• export GOLOG_FILE="/path/to/app.log"

Special rule:

• If you set only GOLOG_FILE (and do NOT set GOLOG_OUTPUT), logs go to file only (not stderr).

Format

• export GOLOG_LOG_FMT="text" -> text logs
• default -> json

Usage

import "github.com/Brian44913/logging"

func main() {
    logging.SetLogLevel("DEBUG")
    logging.SetLogFmt("json")
    logging.SetLogFile("/tmp/app.log")
    logging.SetOutput("stderr+file")

    name := "Jack"
    age := 18
    err := fmt.Errorf("boom")

    logging.Info("msg", "name", name, "age", age, err)

    a := `{"a":"b"}`
    logging.Info("This is test information.", a)
}