From 3453fc346ad4531e071bcae209aa8e36967a799f Mon Sep 17 00:00:00 2001
From: Jan Fuhrer <janfuhrer@mailbox.org>
Date: Wed, 8 May 2024 09:51:06 +0200
Subject: [PATCH] feat: add health endpoint

---
 pkg/http/health.go      | 13 +++++++++++++
 pkg/http/health_test.go | 33 +++++++++++++++++++++++++++++++++
 pkg/http/server.go      |  1 +
 3 files changed, 47 insertions(+)
 create mode 100644 pkg/http/health.go
 create mode 100644 pkg/http/health_test.go

diff --git a/pkg/http/health.go b/pkg/http/health.go
new file mode 100644
index 0000000..26cb13e
--- /dev/null
+++ b/pkg/http/health.go
@@ -0,0 +1,13 @@
+package http
+
+import (
+	"net/http"
+)
+
+func (s *Server) healthHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	if _, err := w.Write([]byte(`{"status": "OK"}`)); err != nil {
+		http.Error(w, "Failed to write response", http.StatusInternalServerError)
+	}
+}
diff --git a/pkg/http/health_test.go b/pkg/http/health_test.go
new file mode 100644
index 0000000..8c16005
--- /dev/null
+++ b/pkg/http/health_test.go
@@ -0,0 +1,33 @@
+//go:build unit
+
+package http
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"go.uber.org/zap/zaptest"
+)
+
+func TestHealthHandler(t *testing.T) {
+	logger := zaptest.NewLogger(t)
+	config := &Config{
+		Host: "localhost",
+		Port: "8080",
+	}
+
+	server, _ := NewServer(config, logger)
+	server.registerHandlers()
+
+	req := httptest.NewRequest("GET", "/health", nil)
+	req.Header.Set("User-Agent", "Mozilla/5.0")
+	w := httptest.NewRecorder()
+	server.router.ServeHTTP(w, req)
+
+	resp := w.Result()
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("Expected status code %d, got %d", http.StatusOK, resp.StatusCode)
+		t.Errorf("Response body: %s", w.Body.String())
+	}
+}
diff --git a/pkg/http/server.go b/pkg/http/server.go
index c0a7f4a..eb942da 100644
--- a/pkg/http/server.go
+++ b/pkg/http/server.go
@@ -37,6 +37,7 @@ func NewServer(config *Config, logger *zap.Logger) (*Server, error) {
 
 func (s *Server) registerHandlers() {
 	s.router.HandleFunc("/", s.indexHandler).HeadersRegexp("User-Agent", "^Mozilla.*").Methods("GET")
+	s.router.HandleFunc("/health", s.healthHandler).Methods("GET")
 }
 
 func (s *Server) registerMiddlewares() {