import sources from develop/0.1.0

go/pkg/infrastructure/app/factory.go

@@ -0,0 +1,50 @@
+package app
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/gorilla/mux"
+	"gitlab.com/tpeetz-kontor/kontor-go/pkg/infrastructure/config"
+	"go.uber.org/zap"
+)
+
+// Application is our general purpose Application struct
+type Application struct {
+	Server *http.Server
+	Router *mux.Router
+	Logger *zap.Logger
+	Config *config.Config
+}
+
+// Run will run the Application server
+func (app *Application) Run() {
+	app.Logger.Info("App started...")
+	err := app.Server.ListenAndServe()
+
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+// WaitForShutdown is a graceful way to handle server shutdown events
+func WaitForShutdown(application *Application) {
+	// Create a channel to listen for OS signals
+	interruptChan := make(chan os.Signal, 1)
+	signal.Notify(interruptChan, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
+
+	// Block until we receive a signal to our channel
+	<-interruptChan
+
+	application.Logger.Info("Received shutdown signal, gracefully terminating")
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+	application.Server.Shutdown(ctx)
+	os.Exit(0)
+}

go/pkg/infrastructure/config/factory.go

@@ -0,0 +1,48 @@
+package config
+
+import "os"
+
+// AppConfig is the Application configuration struct
+type AppConfig struct {
+	Name    string
+	Version string
+	Token   string
+}
+
+// HTTPConfig is the Application HTTP configuration
+type HTTPConfig struct {
+	Content string
+	Problem string
+	Port    string
+}
+
+// Config is the Configuration struct
+type Config struct {
+	App  AppConfig
+	HTTP HTTPConfig
+}
+
+// New returns a new Config Struct
+func New() *Config {
+	return &Config{
+		App: AppConfig{
+			Name:    env("APP_NAME", "Kontor"),
+			Version: env("APP_VERSION", "v1.0"),
+			Token:   env("APP_TOKEN", ""),
+		},
+		HTTP: HTTPConfig{
+			Content: env("HTTP_CONTENT_TYPE", "application/json"),
+			Problem: env("HTTP_PROBLEM", "application/problem+json"),
+			Port:    env("HTTP_PORT", ":8086"),
+		},
+	}
+}
+
+// env is a simple helper function to read an environment variable or return a default value
+func env(key string, defaultValue string) string {
+	if value, exists := os.LookupEnv(key); exists {
+		return value
+	}
+
+	return defaultValue
+}

go/pkg/infrastructure/kernel/app.go

@@ -0,0 +1,91 @@
+package kernel
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/google/uuid"
+	gohandlers "github.com/gorilla/handlers"
+	"github.com/gorilla/mux"
+	"gitlab.com/tpeetz-kontor/kontor-go/pkg/infrastructure/app"
+	"gitlab.com/tpeetz-kontor/kontor-go/pkg/infrastructure/config"
+	"go.uber.org/zap"
+)
+
+// Boot the Application
+func Boot() *app.Application {
+	// Configuration
+	config := bootConfig()
+
+	// Router
+	router := bootRouter()
+
+	// CORS
+	corsHandler := gohandlers.CORS(gohandlers.AllowedOrigins([]string{"*"}))
+
+	// Logger
+	logger := bootLogger()
+	defer logger.Sync() // flushes buffer, if any
+
+	// Create and return and Application
+	return &app.Application{
+		Server: &http.Server{
+			Addr:         config.HTTP.Port,
+			Handler:      corsHandler(requestIDMiddleware(router)),
+			IdleTimeout:  120 * time.Second,
+			ReadTimeout:  1 * time.Second,
+			WriteTimeout: 1 * time.Second,
+		},
+		Router: router,
+		Logger: logger,
+		Config: config,
+	}
+}
+
+func bootConfig() *config.Config {
+	return config.New()
+}
+
+func bootRouter() *mux.Router {
+	return mux.NewRouter()
+}
+
+func bootLogger() *zap.Logger {
+	logger, logError := zap.NewProduction()
+	if logError != nil {
+		panic(logError)
+	}
+
+	return logger
+}
+
+// ContextKey is used for context.Context value. The value requires a key that is not primitive type.
+type ContextKey string
+
+// ContextKeyRequestID is the ContextKey for RequestID
+const ContextKeyRequestID ContextKey = "requestID"
+
+func requestIDMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+		ctx := r.Context()
+
+		id := uuid.New()
+
+		ctx = context.WithValue(ctx, ContextKeyRequestID, id.String())
+
+		r = r.WithContext(ctx)
+
+		bootLogger().Debug("Incoming request",
+			zap.String("method", r.Method),
+			zap.String("uri", r.RequestURI),
+			zap.String("addr", r.RemoteAddr), zap.String("id", id.String()),
+		)
+
+		next.ServeHTTP(w, r)
+
+		bootLogger().Debug("Finished handling http req. %s",
+			zap.String("id", id.String()))
+	})
+}

go/pkg/infrastructure/response/response.go

@@ -0,0 +1,20 @@
+package response
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// Response is a generic HTTP Response Struct
+type Response struct {
+	Data string `json:"data"`
+}
+
+// Send a HTTP Response
+func Send(responseWriter http.ResponseWriter, code int, payload interface{}, contentType string) {
+	response, _ := json.Marshal(payload)
+
+	responseWriter.Header().Set("Content-Type", contentType)
+	responseWriter.WriteHeader(code)
+	responseWriter.Write(response)
+}