refactor: enhance Redis client initialization and context management

client/token.go

@@ -63,7 +63,12 @@ func getToken(configuration *Configuration) (*Token, error) {
 }
 
 func FromCache() *Token {
-	rdb := redis.NewRedis()
+	rdb, err := redis.NewRedis()
+
+	// Check if Redis connection was successful
+	if rdb == nil || err != nil {
+		return nil
+	}
 
 	token := Token{}
 
@@ -81,17 +86,18 @@ func FromCache() *Token {
 }
 
 func saveCache(token *Token) {
-	rdb := redis.NewRedis()
+	rdb, err := redis.NewRedis()
 
-	tokenJson, _ := json.Marshal(token)
-
-	expiresIn := time.Duration(int64(token.ExpiresIn) * 100000000)
-
-	cmd := rdb.Set("api.access_token", tokenJson, expiresIn)
-	result, err := cmd.Result()
-	if err != nil {
+	// no cache available
+	if rdb == nil || err != nil {
 		return
 	}
 
-	println(result)
+	tokenJson, _ := json.Marshal(token)
+
+	const nanosPerSecond = int64(time.Second)
+	expiresIn := time.Duration(int64(token.ExpiresIn) * nanosPerSecond)
+
+	cmd := rdb.Set("api.access_token", tokenJson, expiresIn)
+	_, _ = cmd.Result()
 }