debuglog

Minimal Go logging library with zero runtime cost (when disabled).

Zero runtime cost? How?

Go build tags and compiler optimizations.

All functions in this package are wrapped in an if enabled condition, where enabled is a const defined in build-tag-dependent files. If the build tag is not set, the compiler will optimize out the entire block of code, leaving no trace of it in the final binary:

$ go test -tags debuglog -bench .
goos: linux
goarch: amd64
pkg: github.com/paskozdilar/debuglog
cpu: 13th Gen Intel(R) Core(TM) i7-13800H
BenchmarkDebugLog-20            49902048                24.34 ns/op           32 B/op          1 allocs/op
BenchmarkNoDebugLog-20          1000000000               0.1356 ns/op          0 B/op          0 allocs/op
PASS
ok      github.com/paskozdilar/debuglog 1.394s

$ go test -bench .
goos: linux
goarch: amd64
pkg: github.com/paskozdilar/debuglog
cpu: 13th Gen Intel(R) Core(TM) i7-13800H
BenchmarkDebugLog-20            1000000000               0.1326 ns/op          0 B/op          0 allocs/op
BenchmarkNoDebugLog-20          1000000000               0.1315 ns/op          0 B/op          0 allocs/op
PASS
ok      github.com/paskozdilar/debuglog 0.302s

Usage

Write logging code as usual:

package main

import (
    "github.com/paskozdilar/debuglog"
)

func main() {
    debuglog.Print("Hello, world!")
    debuglog.Printf("Hello, %s!", "world")
    debuglog.Println("Hello,", "world!")
}

To enable it, add Go build tag debuglog to your commands:

go run -tags debuglog main.go
go build -tags debuglog main.go
go test -tags debuglog

To disable it, remove the build tag:

go run main.go
go build main.go
go test