Make it possible to actually use redis for caching through the config flags

server/startup.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"github.com/OrlovEvgeny/go-mcache"
+	"github.com/redis/go-redis/v9"
 	"net"
 	"net/http"
 	"os"
@@ -71,16 +72,33 @@ func Serve(ctx *cli.Context) error {
 	}
 	defer closeFn()
 
+	// keyCache stores the parsed certificate objects (Redis is no advantage here)
 	keyCache := mcache.New()
-	challengeCache := cache.NewInMemoryCache()
-	// canonicalDomainCache stores canonical domains
-	canonicalDomainCache := cache.NewInMemoryCache()
-	// dnsLookupCache stores DNS lookups for custom domains
+	// dnsLookupCache stores DNS lookups for custom domains (Redis is no advantage here)
 	dnsLookupCache := mcache.New()
+
+	var redisErr error = nil
+	createCache := func() cache.ICache {
+		if cfg.RedisURL != "" {
+			opts, err := redis.ParseURL(cfg.RedisURL)
+			if err != nil {
+				redisErr = err
+			}
+			return cache.NewRedisCache(opts)
+		}
+		return cache.NewInMemoryCache()
+	}
+	// challengeCache stores the certificate challenges
+	challengeCache := createCache()
+	// canonicalDomainCache stores canonical domains
+	canonicalDomainCache := createCache()
 	// redirectsCache stores redirects in _redirects files
-	redirectsCache := cache.NewInMemoryCache()
+	redirectsCache := createCache()
 	// clientResponseCache stores responses from the Gitea server
-	clientResponseCache := cache.NewInMemoryCache()
+	clientResponseCache := createCache()
+	if redisErr != nil {
+		return redisErr
+	}
 
 	giteaClient, err := gitea.NewClient(cfg.Gitea, clientResponseCache)
 	if err != nil {