Add Docker Compose configuration for Traefik and Redis services

.gitlab-ci.yml

@@ -2,7 +2,6 @@ stages:
   - Testing
   - build
 
-
 include:
   - component: $CI_SERVER_FQDN/shared/blueprints/golang-tests@v1.2.0
     rules:

docker-compose.yml

@@ -0,0 +1,50 @@
+volumes:
+  redis_data:
+
+services:
+  traefik:
+    image: traefik:latest
+    container_name: traefik
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock"
+    restart: always
+    command:
+      - "--providers.docker=true"
+      - "--providers.docker.exposedByDefault=false"
+      - "--entrypoints.web.address=:80"
+      - "--entrypoints.web-secure.address=:443"
+      - "--accesslog=true"
+      - "--entrypoints.web.http.redirections.entryPoint.to=web-secure"
+      - "--entrypoints.web.http.redirections.entryPoint.scheme=https"
+      - "--entrypoints.web.http.redirections.entrypoint.permanent=true"
+
+  redis:
+    image: redis:latest
+    container_name: redis
+    restart: always
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+    volumes:
+      - redis_data:/data
+
+  api:
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.api.entrypoints=web-secure"
+      - "traefik.http.routers.api.rule=Host(`localhost`) || Host(`127.0.0.1`)"
+      - "traefik.http.routers.api.tls=true"
+      - "traefik.http.services.api.loadbalancer.server.port=8080"
+    image: siteworxpro/top-wallpaper:v1.3.0
+    container_name: top-wallpaper
+    environment:
+      REDIS_URL: "redis"
+      CORS_ORIGINS: "https://localhost"
+    depends_on:
+      redis:
+        condition: service_healthy

http/handler.go

@@ -1,93 +1,25 @@
 package http
 
 import (
-	"context"
 	"github.com/labstack/echo/v4"
-	client "github.com/siteworxpro/top-wallpaper/reddit"
-	"github.com/siteworxpro/top-wallpaper/resize"
-	"io"
+	"github.com/siteworxpro/top-wallpaper/redis"
 	"net/http"
-	"time"
 )
 
 func Get(c echo.Context) error {
-	cc := c.(*CustomContext)
 
-	var latestImageVal string
-	var err error
-	if cc.redis != nil {
-		latestImage := cc.redis.Get(context.TODO(), "latestImage")
-		latestImageVal, err = latestImage.Result()
-	}
-
-	if err != nil || latestImageVal == "" {
-		c.Logger().Info("Fetching latest image")
-		latestImageVal, err = client.GetLatestImage(func(url string) (*http.Response, error) {
-			return http.Get(url)
-		})
-		if err != nil {
-			return c.String(http.StatusInternalServerError, "Error fetching latest image")
-		}
-
-		if cc.redis != nil {
-			cmd := cc.redis.Set(context.TODO(), "latestImage", latestImageVal, 600*time.Second)
-			if cmd.Err() != nil {
-				c.Logger().Warn("could not cache image")
-			}
-		}
-	} else {
-		c.Logger().Info("Image name fetched from cache")
-	}
-
-	var imageData string
-	if cc.redis != nil {
-		latestImageBin := cc.redis.Get(context.TODO(), "latestImage:bin:"+latestImageVal)
-		imageData = latestImageBin.Val()
-	}
-
-	if imageData != "" {
-		c.Logger().Info("Image data fetched from cache")
-
-		return c.Blob(http.StatusOK, "image/jpeg", []byte(imageData))
-	}
-
-	response, err := http.Get(latestImageVal)
+	rc, err := redis.NewRedis()
 	if err != nil {
-		return c.String(http.StatusInternalServerError, "Error fetching image")
+		return c.String(http.StatusInternalServerError, "Internal Server Error: "+err.Error())
 	}
 
-	if response.StatusCode != http.StatusOK {
-		return c.String(http.StatusInternalServerError, "Error fetching image")
+	val, err := rc.Get(redis.CacheKey)
+
+	if err != nil || val == "" {
+		return c.NoContent(http.StatusNoContent)
 	}
 
-	defer func(Body io.ReadCloser) {
-		_ = Body.Close()
-	}(response.Body)
-
-	imageDataBytes, err := io.ReadAll(response.Body)
-	if err != nil {
-		return c.String(http.StatusInternalServerError, "Error fetching image")
-	}
-
-	imageData = string(imageDataBytes)
-	resized, err := resize.Shrink(imageData, 1200, 70)
-
-	if err != nil {
-		return c.String(http.StatusInternalServerError, "Error resizing image")
-	}
-
-	go func(data string) {
-		if cc.redis == nil {
-			return
-		}
-
-		_, err = cc.redis.Set(context.TODO(), "latestImage:bin:"+latestImageVal, data, 600*time.Second).Result()
-		if err != nil {
-			c.Logger().Warn("could not cache image")
-		}
-	}(resized)
-
 	c.Response().Header().Set("Cache-Control", "public, max-age=600")
 
-	return c.Blob(http.StatusOK, "image/jpeg", []byte(resized))
+	return c.Blob(http.StatusOK, "image/jpeg", []byte(val))
 }

http/middleware.go

@@ -1,59 +0,0 @@
-package http
-
-import (
-	"context"
-	"fmt"
-	"github.com/labstack/echo/v4"
-	"github.com/redis/go-redis/v9"
-	"os"
-	"strconv"
-)
-
-type CustomContext struct {
-	echo.Context
-	redis *redis.Client
-}
-
-func GetCustomContext(next echo.HandlerFunc) echo.HandlerFunc {
-	return func(c echo.Context) error {
-		redisUrl := os.Getenv("REDIS_URL")
-		if redisUrl == "" {
-			c.Logger().Warn("REDIS_URL not set, skipping redis connection. Use REDIS_URL to cache the image")
-
-			return next(&CustomContext{c, nil})
-		}
-
-		redisPort := os.Getenv("REDIS_PORT")
-		if redisPort == "" {
-			redisPort = "6379"
-		}
-
-		redisDb := os.Getenv("REDIS_DB")
-		if redisDb == "" {
-			redisDb = "0"
-		}
-
-		redisDbInt, err := strconv.ParseInt(redisDb, 10, 64)
-		if err != nil {
-			c.Logger().Warn("REDIS_DB is not a valid integer, skipping redis connection. Use REDIS_DB to cache the image")
-
-			return next(&CustomContext{})
-		}
-
-		cc := &CustomContext{c, redis.NewClient(&redis.Options{
-			Addr:     fmt.Sprintf("%s:%s", redisUrl, redisPort),
-			Password: os.Getenv("REDIS_PASSWORD"),
-			DB:       int(redisDbInt),
-		})}
-
-		cmd := cc.redis.Ping(context.Background())
-
-		if cmd.Err() != nil {
-			c.Logger().Warn("could not connect to redis")
-
-			cc.redis = nil
-		}
-
-		return next(cc)
-	}
-}

main.go

@@ -1,10 +1,13 @@
 package main
 
 import (
+	"context"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
 	"github.com/labstack/gommon/log"
 	tphttp "github.com/siteworxpro/top-wallpaper/http"
+	"github.com/siteworxpro/top-wallpaper/reddit"
+	"github.com/siteworxpro/top-wallpaper/redis"
 	"net/http"
 	"os"
 	"strings"
@@ -12,12 +15,23 @@ import (
 
 func main() {
 
-	e := echo.New()
-	e.Logger.SetLevel(log.INFO)
+	ctx, fn := context.WithCancel(context.Background())
+	defer fn()
 
+	rc, err := redis.NewRedis()
+
+	if err != nil {
+		log.Error("Could not initialize Redis client: ", err)
+		os.Exit(1)
+	}
+
+	e := echo.New()
+	e.AcquireContext().Set("redisClient", rc)
+	e.Logger.SetOutput(os.Stdout)
+
+	e.Logger.SetLevel(log.INFO)
 	e.HideBanner = true
 
-	e.Use(tphttp.GetCustomContext)
 	e.Use(middleware.Logger())
 	e.Use(middleware.RequestID())
 	e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
@@ -34,12 +48,16 @@ func main() {
 	e.GET(path, tphttp.Get)
 
 	e.Logger.Info("Starting server at path " + path)
-	// start the server
 
 	port := os.Getenv("PORT")
 	if port == "" {
 		port = "8080"
 	}
 
+	ctx = redis.WithContext(ctx, rc)
+	ctx = context.WithValue(ctx, "logger", e.Logger)
+
+	go reddit.Fetch(ctx)
+
 	e.Logger.Fatal(e.Start(":" + port))
 }

reddit/fetcher.go

@@ -0,0 +1,132 @@
+package reddit
+
+import (
+	"context"
+	"github.com/labstack/echo/v4"
+	"github.com/siteworxpro/top-wallpaper/redis"
+	"github.com/siteworxpro/top-wallpaper/resize"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func Fetch(ctx context.Context) {
+	const defaultImageSize = 1600
+	const minImageSize = 100
+
+	rc, err := redis.FromContext(ctx)
+	if err != nil {
+		panic("Redis client not found in context: " + err.Error())
+	}
+
+	l := ctx.Value("logger").(echo.Logger)
+
+	var size int
+	if sizeS, ok := os.LookupEnv("MAX_SIZE"); ok {
+		size, err = strconv.Atoi(sizeS)
+		if err != nil {
+			size = defaultImageSize
+		}
+	} else {
+		size = defaultImageSize
+	}
+
+	if size < minImageSize {
+		size = defaultImageSize
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+
+			l.Info("Stopping Reddit fetcher...")
+			_ = rc.Close()
+
+			return
+		default:
+
+			val, err := rc.Get(redis.CacheKey)
+			if val != "" {
+				l.Info("Reddit image fetched from cache...")
+
+				break
+			}
+
+			l.Info("Fetching latest image from Reddit...")
+
+			latestImageVal, err := GetLatestImage(func(u string) (*http.Response, error) {
+
+				request := &http.Request{
+					Method: http.MethodGet,
+					Header: http.Header{
+						"User-Agent": []string{"Mozilla/5.0 (compatible; RedditBot/1.0; +https://www.reddit.com/wiki/redditauth)"},
+					},
+					URL: &url.URL{
+						Scheme: "https",
+						Host:   "www.reddit.com",
+						Path:   strings.TrimPrefix(u, "https://www.reddit.com"),
+					},
+				}
+
+				httpClient := &http.Client{
+					Timeout: 10 * time.Second,
+				}
+
+				response, err := httpClient.Do(request)
+
+				if err != nil {
+					l.Error("Error fetching image from Reddit: ", err)
+					return nil, err
+				}
+
+				if response.StatusCode != http.StatusOK {
+					l.Error("Error fetching image from Reddit: ", response.Status)
+					return nil, &echo.HTTPError{
+						Code:    response.StatusCode,
+						Message: "Error fetching image from Reddit",
+					}
+				}
+
+				return response, nil
+			})
+
+			response, err := http.Get(latestImageVal)
+			if err != nil {
+				l.Error("Error fetching image from Reddit: ", err)
+
+				break
+			}
+
+			if response.StatusCode != http.StatusOK {
+				l.Error("Error fetching image from Reddit: ", response.Status)
+
+				break
+			}
+
+			imageDataBytes, err := io.ReadAll(response.Body)
+			if err != nil {
+				l.Error("Error reading image data: ", err)
+				_ = response.Body.Close()
+				break
+			}
+
+			_ = response.Body.Close()
+
+			imageData := string(imageDataBytes)
+			resized, err := resize.Shrink(imageData, uint(size), 70)
+
+			err = rc.Set(redis.CacheKey, resized, 10*time.Minute)
+			if err != nil {
+				l.Warn("could not cache image")
+			}
+
+			l.Info("Reddit image fetched and resized successfully, cached for 10 minutes.")
+		}
+
+		time.Sleep(10 * time.Minute)
+	}
+}

redis/client.go

@@ -0,0 +1,118 @@
+package redis
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"github.com/redis/go-redis/v9"
+	"os"
+	"strconv"
+	"time"
+)
+
+type contextKey string
+
+const redisKey contextKey = "redisClient"
+
+const CacheKey = "top-wallpaper:latestImage"
+
+type Cache interface {
+	Get(key string) (string, error)
+	Set(key string, value string, expiration int64) error
+	Close() error
+}
+
+type Redis struct {
+	client *redis.Client
+}
+
+func NewRedis() (*Redis, error) {
+
+	redisUrl := os.Getenv("REDIS_URL")
+	if redisUrl == "" {
+		return nil, errors.New("REDIS_URL not set, cannot initialize Redis client")
+	}
+
+	redisPort := os.Getenv("REDIS_PORT")
+	if redisPort == "" {
+		redisPort = "6379"
+	}
+
+	redisDb := os.Getenv("REDIS_DB")
+	if redisDb == "" {
+		redisDb = "0"
+	}
+
+	redisDbInt, err := strconv.ParseInt(redisDb, 10, 64)
+	if err != nil {
+		return nil, errors.New("REDIS_DB is not a valid integer, cannot initialize Redis client")
+	}
+
+	rc := redis.NewClient(&redis.Options{
+		Addr:     fmt.Sprintf("%s:%s", redisUrl, redisPort),
+		Password: os.Getenv("REDIS_PASSWORD"),
+		DB:       int(redisDbInt),
+	})
+
+	cmd := rc.Ping(context.Background())
+
+	if cmd.Err() != nil {
+		return nil, fmt.Errorf("could not connect to Redis: %v", cmd.Err())
+	}
+	if cmd.Val() != "PONG" {
+		return nil, fmt.Errorf("unexpected response from Redis: %s", cmd.Val())
+	}
+
+	return &Redis{
+		client: rc,
+	}, nil
+}
+
+func (r *Redis) Get(key string) (string, error) {
+	cmd := r.client.Get(context.Background(), key)
+	if cmd.Err() != nil {
+		if errors.Is(cmd.Err(), redis.Nil) {
+			return "", nil // Key does not exist
+		}
+		return "", fmt.Errorf("could not get value for key %s: %v", key, cmd.Err())
+	}
+	return cmd.Val(), nil
+}
+
+func (r *Redis) Set(key string, value string, expiration time.Duration) error {
+	cmd := r.client.Set(context.Background(), key, value, expiration)
+	if cmd.Err() != nil {
+		return fmt.Errorf("could not set value for key %s: %v", key, cmd.Err())
+	}
+	if cmd.Val() != "OK" {
+		return fmt.Errorf("unexpected response from Redis when setting key %s: %s", key, cmd.Val())
+	}
+
+	return nil
+}
+
+func (r *Redis) Close() error {
+	if r.client == nil {
+		return nil
+	}
+	err := r.client.Close()
+	if err != nil {
+		return fmt.Errorf("could not close Redis client: %v", err)
+	}
+	return nil
+}
+
+func WithContext(ctx context.Context, r *Redis) context.Context {
+	return context.WithValue(ctx, redisKey, r)
+}
+
+func FromContext(ctx context.Context) (*Redis, error) {
+	r, ok := ctx.Value(redisKey).(*Redis)
+	if !ok {
+		return nil, errors.New("no Redis client found in context")
+	}
+	if r == nil {
+		return nil, errors.New("redis client is nil")
+	}
+	return r, nil
+}