First version not working, unsafe library

go.mod

@@ -3,3 +3,9 @@ module github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin
 go 1.17
 
 require github.com/leprosus/golang-ttl-map v1.1.7
+
+require (
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/go-redis/redis/v9 v9.0.0-rc.1 // indirect
+)

go.sum

@@ -1,2 +1,8 @@
+github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
+github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/go-redis/redis/v9 v9.0.0-rc.1 h1:/+bS+yeUnanqAbuD3QwlejzQZ+4eqgfUtFTG4b+QnXs=
+github.com/go-redis/redis/v9 v9.0.0-rc.1/go.mod h1:8et+z03j0l8N+DvsVnclzjf3Dl/pFHgRk+2Ct1qw66A=
 github.com/leprosus/golang-ttl-map v1.1.7 h1:cF4AAFDDnJTFSV+/42sKLhmMluvLdRlCGS2UaifH6UM=
 github.com/leprosus/golang-ttl-map v1.1.7/go.mod h1:4QWHJPeVBbrkhOhXdhCv9IEiyj/YzkO04/iexy4vSe0=

pkg/cache/cache.go

@@ -1,17 +1,20 @@
 package cache
 
 import (
+	"context"
 	"fmt"
 
 	ttl_map "github.com/leprosus/golang-ttl-map"
 
 	logger "github.com/maxlerebourg/crowdsec-bouncer-traefik-plugin/pkg/logger"
 )
+
 const (
-	cacheBannedValue        = "t"
-	cacheNoBannedValue      = "f"
+	cacheBannedValue   = "t"
+	cacheNoBannedValue = "f"
 )
 
+var ctx = context.Background()
 var cache = ttl_map.New()
 
 // Get Decision check in the cache if the IP has the banned / not banned value.
@@ -25,6 +28,33 @@ func GetDecision(clientIP string) (bool, error) {
 	return false, fmt.Errorf("no cache data")
 }
 
+func getDecisionLocalCache(clientIP string) (bool, error) {
+	banned, isCached := cache.Get(clientIP)
+	bannedString, isValid := banned.(string)
+	if isCached && isValid && len(bannedString) > 0 {
+		return bannedString == cacheBannedValue, nil
+	}
+	return false, fmt.Errorf("no cache data")
+}
+
+func getDecisionRedisCache(clientIP string) (bool, error) {
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "", // no password set
+		DB:       0,  // use default DB
+	})
+	banned, err := rdb.Get(ctx, "key").Result()
+	if err != nil {
+		panic(err)
+	}
+	banned, isCached := cache.Get(clientIP)
+	bannedString, isValid := banned.(string)
+	if isCached && isValid && len(bannedString) > 0 {
+		return bannedString == cacheBannedValue, nil
+	}
+	return false, fmt.Errorf("no cache data")
+}
+
 func SetDecision(clientIP string, isBanned bool, duration int64) {
 	if isBanned {
 		logger.Debug(fmt.Sprintf("%v banned", clientIP))

vendor/modules.txt

@@ -1,3 +1,9 @@
+# github.com/cespare/xxhash/v2 v2.1.2
+## explicit; go 1.11
+# github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f
+## explicit
+# github.com/go-redis/redis/v9 v9.0.0-rc.1
+## explicit; go 1.17
 # github.com/leprosus/golang-ttl-map v1.1.7
 ## explicit; go 1.15
 github.com/leprosus/golang-ttl-map