Add configs for rate limit

pkg/config/config.go

@@ -91,9 +91,10 @@ type SslOptions struct {
 
 // declare RateLimitConfig
 type RateLimitOptions struct {
-	RequestsPerSecond int
-	BurstSize         int
-	CleanupInterval   config.Duration
+	Enabled           bool            `json:"enabled"`
+	RequestsPerSecond int             `json:"requestsPerSecond"`
+	BurstSize         int             `json:"burstSize"`
+	CleanupInterval   config.Duration `json:"cleanupInterval"`
 }
 
 var defaultServerConfig = &ServerConfig{

plugins/rate_limit.go

@@ -27,7 +27,7 @@ type Limiter struct {
 // define a function named Allow that takes userID and returns RateLimitError
 // the function check if the user is in the map, if not, create a new accessRecords for the user
 // then it check if the user can access the resource, if not, return RateLimitError
-func (l *Limiter) Allow(userID string) RateLimitError {
+func (l *Limiter) Allow(userID string) error {
 	l.mutex.Lock()
 	defer l.mutex.Unlock()
 	if _, ok := l.accessPerUser[userID]; !ok {