feat: add a health endpoint and upgrade Dockerfile and Compose

- Upgrade Golang version in Dockerfile from 1.19.5-alpine3.17 to 1.23-alpine
- Add health check endpoint "/health" in server.go

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19.5-alpine3.17 AS builder
+FROM golang:1.23-alpine AS builder
 WORKDIR /build
 EXPOSE 8081
 COPY go.mod go.sum ./

docker-compose.yml → compose.yml

@@ -1,5 +1,3 @@
-version: "3.9"
-
 services:
   api:
     container_name: go-api
@@ -9,29 +7,38 @@ services:
     image: go-api
     ports:
       - 8080:8080
+    env_file:
+      - .env.example
     environment:
       - MONGO_URI=mongodb://db:27017
-      - MONGO_DB=opensource
-      - MONGO_COLLECTION=contributors
-      - PORT=8080
-      - BASIC_AUTH_USERNAME=opensource
-      - BASIC_AUTH_PASSWORD=greensquare
-    depends_on:
-      - db  
     networks:
       - go-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+    depends_on:
+      db:
+        condition: service_healthy
 
   db:
     container_name: go-mongodb
-    image: mongo:6.0
+    image: mongo:7.0.0
     volumes:  
       - dbdata:/data/db
     networks:
       - go-network
+    healthcheck:
+      test: ["CMD", "pgrep", "mongod"]
+      interval: 10s
+      timeout: 10s
+      retries: 5
+      start_period: 40s
 
 volumes:
   dbdata:
 
 networks:
   go-network:
-    driver: bridge
+    driver: bridge

handler/handler.go

@@ -26,3 +26,11 @@ func PlaygroundHandler() gin.HandlerFunc {
 		h.ServeHTTP(c.Writer, c.Request)
 	}
 }
+
+func HealthCheckHandler() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.JSON(200, gin.H{
+			"message": "healthy",
+		})
+	}
+}

server.go

@@ -14,6 +14,7 @@ func main() {
 
 	router.Use(middleware.BasicAuth())
 	router.GET("/", handler.PlaygroundHandler())
+	router.GET("/health", handler.HealthCheckHandler())
 	router.POST("/query", handler.GraphqlHandler())
 
 	log.Fatal(router.Run())