complete todo-app with K8s deployment and configurations

Author: yashpal2104

.gitignore

@@ -0,0 +1,23 @@
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

.npmrc

@@ -0,0 +1 @@
+engine-strict=true

docker-compose.yml

@@ -0,0 +1,28 @@
+# Use version 3.8 of the Docker Compose file format
+version: '3.8'
+
+# Define the services (containers) for our application
+services:
+  # The Go backend service
+  backend:
+    build:
+      context: ./go-todo-backend  # The directory containing the backend's Dockerfile
+      dockerfile: Dockerfile
+    image: docker0y4sh/todo-backend:latest
+    ports:
+      # Map port 8080 on the host to port 8080 in the container
+      - "8080:8080"
+    restart: always
+
+  # The Svelte frontend service
+  frontend:
+    build:
+      context: ./go-todo-frontend # The directory containing the frontend's Dockerfile
+      dockerfile: Dockerfile
+    image: docker0y4sh/todo-frontend:latest
+    ports:
+      # Map port 5173 on the host to port 80 in the container (where Nginx is running)
+      - "5173:80"
+    depends_on:
+      - backend                 # This tells Docker to start the backend before the frontend
+    restart: always

go-todo-backend/Dockerfile

@@ -0,0 +1,37 @@
+# --- Stage 1: The Builder ---
+# Use the official Go image to build our application.
+# This image contains all the necessary compilers and tools.
+FROM golang:1.24-alpine AS builder
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the dependency files first. This leverages Docker's layer caching.
+# If these files don't change, Docker won't re-download dependencies.
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the rest of the source code
+COPY . .
+
+# Build the application.
+# CGO_ENABLED=0 creates a statically linked binary (no external dependencies).
+# -o /go-todo-app specifies the output path for the compiled binary.
+RUN CGO_ENABLED=0 GOOS=linux go build -o /go-todo-app ./main.go
+
+# --- Stage 2: The Final Image ---
+# Use a minimal base image like Alpine Linux.
+# This image is much smaller than the Go image, leading to a tiny final image.
+FROM alpine:latest
+
+# Set the working directory
+WORKDIR /root/
+
+# Copy ONLY the compiled binary from the 'builder' stage.
+COPY --from=builder /go-todo-app .
+
+# Expose port 8080 to the outside world.
+EXPOSE 8080
+
+# Command to run the application when the container starts.
+CMD ["./go-todo-app"]

go-todo-backend/go.mod

@@ -0,0 +1,37 @@
+module github.com/yashpal2104/go-todo-backend
+
+go 1.24.4
+
+require (
+	github.com/gin-contrib/cors v1.7.6
+	github.com/gin-gonic/gin v1.10.1
+)
+
+require (
+	github.com/bytedance/sonic v1.13.3 // indirect
+	github.com/bytedance/sonic/loader v0.2.4 // indirect
+	github.com/cloudwego/base64x v0.1.5 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.9 // indirect
+	github.com/gin-contrib/sse v1.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.26.0 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.11 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.3.0 // indirect
+	golang.org/x/arch v0.18.0 // indirect
+	golang.org/x/crypto v0.39.0 // indirect
+	golang.org/x/net v0.41.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.26.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go-todo-backend/go.sum

@@ -0,0 +1,92 @@
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go-todo-backend/main.go

@@ -0,0 +1,140 @@
+// go-todo-backend/main.go
+
+package main
+
+import (
+	"net/http"
+	"strconv"
+	"sync"
+
+	"github.com/gin-contrib/cors"
+	"github.com/gin-gonic/gin"
+)
+
+// Task represents the structure of our task/note object.
+type Task struct {
+	ID        int    `json:"id"`
+	Title     string `json:"title"`
+	Completed bool   `json:"completed"`
+}
+
+// --- In-Memory "Database" ---
+// For this simple example, we'll store tasks in memory.
+// In a real application, we would use a database like PostgreSQL or SQLite.
+var (
+	tasks      = make(map[int]Task)
+	nextTaskID = 1
+	lock       = sync.Mutex{} // A mutex to handle concurrent requests safely
+)
+
+func main() {
+	// Initialize Gin router
+	router := gin.Default()
+
+	// --- CORS Middleware ---
+	// This is crucial for allowing the frontend (running on a different port)
+	// to communicate with this backend.
+	config := cors.DefaultConfig()
+	config.AllowOrigins = []string{"http://localhost:5173"} // The default Svelte dev server port
+	config.AllowMethods = []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}
+	router.Use(cors.New(config))
+
+	// --- API Routes ---
+	api := router.Group("/api")
+	{
+		api.GET("/tasks", getTasks)
+		api.POST("/tasks", addTask)
+		api.PUT("/tasks/:id", updateTask)
+		api.DELETE("/tasks/:id", deleteTask)
+	}
+	
+	// Pre-populate with some data for demonstration
+	tasks[nextTaskID] = Task{ID: nextTaskID, Title: "Learn Go & Gin", Completed: true}
+	nextTaskID++
+	tasks[nextTaskID] = Task{ID: nextTaskID, Title: "Build a Svelte Frontend", Completed: false}
+	nextTaskID++
+
+	// Start the server
+	router.Run("0.0.0.0:8080") // Listen and serve on http://localhost:8080
+}
+
+// --- Route Handlers ---
+
+// getTasks responds with the list of all tasks as JSON.
+func getTasks(c *gin.Context) {
+	lock.Lock()
+	defer lock.Unlock()
+
+	// Convert map to slice for consistent JSON output
+	taskList := make([]Task, 0, len(tasks))
+	for _, task := range tasks {
+		taskList = append(taskList, task)
+	}
+
+	c.JSON(http.StatusOK, taskList)
+}
+
+// addTask adds a new task from the JSON received in the request body.
+func addTask(c *gin.Context) {
+	var newTask Task
+
+	// Bind the received JSON to the newTask struct
+	if err := c.ShouldBindJSON(&newTask); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	lock.Lock()
+	defer lock.Unlock()
+
+	newTask.ID = nextTaskID
+	newTask.Completed = false // New tasks are always incomplete
+	tasks[newTask.ID] = newTask
+	nextTaskID++
+
+	c.JSON(http.StatusCreated, newTask)
+}
+
+// updateTask updates an existing task's status (e.g., toggles 'completed').
+func updateTask(c *gin.Context) {
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid ID"})
+		return
+	}
+
+	var updatedTask Task
+	if err := c.ShouldBindJSON(&updatedTask); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	lock.Lock()
+	defer lock.Unlock()
+
+	if _, ok := tasks[id]; ok {
+		tasks[id] = updatedTask // Replace the whole task
+		c.JSON(http.StatusOK, updatedTask)
+	} else {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Task not found"})
+	}
+}
+
+// deleteTask removes a task by its ID.
+func deleteTask(c *gin.Context) {
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid ID"})
+		return
+	}
+
+	lock.Lock()
+	defer lock.Unlock()
+
+	if _, ok := tasks[id]; ok {
+		delete(tasks, id)
+		c.Status(http.StatusNoContent) // Success, no content to return
+	} else {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Task not found"})
+	}
+}

go-todo-frontend/Dockerfile

@@ -0,0 +1,22 @@
+# --- Stage 1: The Builder ---
+FROM node:20-alpine as builder
+
+# Set the working directory
+WORKDIR /app
+
+# Copy package.json and package-lock.json for dependency installation
+COPY package*.json ./
+RUN npm install
+
+# Copy the rest of the application source code
+COPY . .
+
+# Run the build script defined in package.json
+RUN npm run build
+
+# --- Stage 2: The Final Image ---
+FROM nginx:stable-alpine
+COPY --from=builder /app/build /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]