syntax = "proto3";

package envoy.type.v3;

import "google/protobuf/duration.proto";
import "google/protobuf/wrappers.proto";

import "udpa/annotations/status.proto";
import "udpa/annotations/versioning.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.type.v3";
option java_outer_classname = "TokenBucketProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/type/v3;typev3";
option (udpa.annotations.file_status).package_version_status = ACTIVE;

// [#protodoc-title: Token bucket]

// Configures a token bucket, typically used for rate limiting.
message TokenBucket {
  option (udpa.annotations.versioning).previous_message_type = "envoy.type.TokenBucket";

  // The maximum tokens that the bucket can hold. This is also the number of tokens that the bucket
  // initially contains. A value of 0 means the bucket will always be empty and all requests will
  // be rate limited (i.e., always reject).
  uint32 max_tokens = 1 [(validate.rules).uint32 = {gte: 0}];

  // The number of tokens added to the bucket during each fill interval. If not specified, defaults
  // to a single token.
  google.protobuf.UInt32Value tokens_per_fill = 2 [(validate.rules).uint32 = {gt: 0}];

  // The fill interval that tokens are added to the bucket. During each fill interval
  // ``tokens_per_fill`` are added to the bucket. The bucket will never contain more than
  // ``max_tokens`` tokens.
  google.protobuf.Duration fill_interval = 3 [(validate.rules).duration = {
    required: true
    gt {}
  }];
}
