Simple Go HTTP server with graceful signal handling

Signed-off-by: Mel <einebeere@gmail.com>

4 files changed, 80 insertions, 5 deletions

diff --git a/application/pkg/specimen/handler.go b/application/pkg/specimen/handler.go
new file mode 100644
index 0000000..05a56ec
--- /dev/null
+++ b/application/pkg/specimen/handler.go
@@ -0,0 +1,19 @@
+package specimen
+
+import (
+	"log/slog"
+	"net/http"
+)
+
+type requestHandler struct {
+	logger *slog.Logger
+}
+
+func newRequestHandler(logger *slog.Logger) *requestHandler {
+	return &requestHandler{logger: logger}
+}
+
+func (h *requestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	h.logger.Info("received a request!", slog.String("method", r.Method), slog.String("url", r.URL.String()))
+	w.WriteHeader(http.StatusOK)
+}
diff --git a/application/pkg/specimen/server.go b/application/pkg/specimen/server.go
new file mode 100644
index 0000000..cccf6e2
--- /dev/null
+++ b/application/pkg/specimen/server.go
@@ -0,0 +1,54 @@
+package specimen
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"time"
+)
+
+const port = 4444
+
+type Server struct {
+	logger  *slog.Logger
+	server  *http.Server
+	handler *requestHandler
+}
+
+func NewServer(logger *slog.Logger) *Server {
+	handler := newRequestHandler(logger)
+
+	return &Server{
+		logger: logger,
+		server: &http.Server{
+			Addr:         fmt.Sprintf(":%d", port),
+			Handler:      handler,
+			ReadTimeout:  10 * time.Second,
+			WriteTimeout: 10 * time.Second,
+		},
+	}
+}
+
+func (s *Server) Start(ctx context.Context) {
+	s.logger.Info("listening for incoming connections...")
+	err := s.server.ListenAndServe()
+
+	switch err {
+	case http.ErrServerClosed:
+		s.logger.Info("listening has been successfully stopped.")
+	default:
+		s.logger.Error("failed to start the http server.", slog.Any("error", err))
+	}
+}
+
+func (s *Server) Shutdown(shutdownCtx context.Context) error {
+	s.logger.Info("shutting down the http server...")
+	if err := s.server.Shutdown(shutdownCtx); err != nil {
+		s.logger.Error("failed to shutdown the server :(", slog.Any("error", err))
+		return err
+	}
+
+	s.logger.Info("http server has been shutdown!")
+	return nil
+}
diff --git a/application/pkg/specimen/specimen.go b/application/pkg/specimen/specimen.go
deleted file mode 100644
index 3e11364..0000000
--- a/application/pkg/specimen/specimen.go
+++ /dev/null
@@ -1,5 +0,0 @@
-package specimen
-
-func ASimpleMessage() string {
-	return "hi! everything is still working!! :)"
-}
diff --git a/application/pkg/util/slog.go b/application/pkg/util/slog.go
new file mode 100644
index 0000000..ebae96f
--- /dev/null
+++ b/application/pkg/util/slog.go
@@ -0,0 +1,7 @@
+package util
+
+import "log/slog"
+
+func SlogErr(err error) slog.Attr {
+	return slog.Any("error", err)
+}