feat: add logging (#3)

Author: matthiashermsen

README.md

@@ -6,7 +6,7 @@ Quickly get started with a minimal Golang starter template!
 
 ## Features
 
-- Bare Golang application
+- Bare Golang application with logging ( pointing to the standard output )
 - Release management using [GoReleaser](https://goreleaser.com/)
 - Github container registry for [Docker](https://www.docker.com/)
 - Updates using [Dependabot](https://github.com/dependabot)

logging/debug.go

@@ -0,0 +1,5 @@
+package logging
+
+func Debug(message string, args ...any) {
+	logger.Debug(message, args...)
+}

logging/documentation.go

@@ -0,0 +1,2 @@
+// Package logging provides logging functionalities.
+package logging

logging/error.go

@@ -0,0 +1,5 @@
+package logging
+
+func Error(message string, args ...any) {
+	logger.Error(message, args...)
+}

logging/info.go

@@ -0,0 +1,5 @@
+package logging
+
+func Info(message string, args ...any) {
+	logger.Info(message, args...)
+}

logging/logging.go

@@ -0,0 +1,16 @@
+package logging
+
+import (
+	"log/slog"
+	"os"
+)
+
+var (
+	logger   *slog.Logger
+	logLevel = new(slog.LevelVar)
+)
+
+func init() {
+	logHandler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel})
+	logger = slog.New(logHandler)
+}

logging/set_level.go

@@ -0,0 +1,7 @@
+package logging
+
+import "log/slog"
+
+func SetLevel(level slog.Level) {
+	logLevel.Set(level)
+}

logging/warn.go

@@ -0,0 +1,5 @@
+package logging
+
+func Warn(message string, args ...any) {
+	logger.Warn(message, args...)
+}

main.go

@@ -4,8 +4,9 @@ import (
 	"fmt"
 
 	"github.com/matthiashermsen/go-starter/app"
+	"github.com/matthiashermsen/go-starter/logging"
 )
 
 func main() {
-	fmt.Printf("Current app version is: %s", app.Version)
+	logging.Info(fmt.Sprintf("Running on version %s", app.Version))
 }