syntax = "proto3";

package envoy.config.core.v4alpha;

import "envoy/config/core/v4alpha/config_source.proto";

import "google/protobuf/any.proto";

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

option java_package = "io.envoyproxy.envoy.config.core.v4alpha";
option java_outer_classname = "ExtensionProto";
option java_multiple_files = true;
option (udpa.annotations.file_status).package_version_status = NEXT_MAJOR_VERSION_CANDIDATE;

// [#protodoc-title: Extension configuration]

// Message type for extension configuration.
// [#next-major-version: revisit all existing typed_config that doesn't use this wrapper.].
message TypedExtensionConfig {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.core.v3.TypedExtensionConfig";

  // The name of an extension. This is not used to select the extension, instead
  // it serves the role of an opaque identifier.
  string name = 1 [(validate.rules).string = {min_len: 1}];

  // The typed config for the extension. The type URL will be used to identify
  // the extension. In the case that the type URL is *udpa.type.v1.TypedStruct*,
  // the inner type URL of *TypedStruct* will be utilized. See the
  // :ref:`extension configuration overview
  // <config_overview_extension_configuration>` for further details.
  google.protobuf.Any typed_config = 2 [(validate.rules).any = {required: true}];
}

// Configuration source specifier for a late-bound extension configuration. The
// parent resource is warmed until all the initial extension configurations are
// received, unless the flag to apply the default configuration is set.
// Subsequent extension updates are atomic on a per-worker basis. Once an
// extension configuration is applied to a request or a connection, it remains
// constant for the duration of processing. If the initial delivery of the
// extension configuration fails, due to a timeout for example, the optional
// default configuration is applied. Without a default configuration, the
// extension is disabled, until an extension configuration is received. The
// behavior of a disabled extension depends on the context. For example, a
// filter chain with a disabled extension filter rejects all incoming streams.
message ExtensionConfigSource {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.config.core.v3.ExtensionConfigSource";

  ConfigSource config_source = 1 [(validate.rules).any = {required: true}];

  // Optional default configuration to use as the initial configuration if
  // there is a failure to receive the initial extension configuration or if
  // `apply_default_config_without_warming` flag is set.
  google.protobuf.Any default_config = 2;

  // Use the default config as the initial configuration without warming and
  // waiting for the first discovery response. Requires the default configuration
  // to be supplied.
  bool apply_default_config_without_warming = 3;

  // A set of permitted extension type URLs. Extension configuration updates are rejected
  // if they do not match any type URL in the set.
  repeated string type_urls = 4 [(validate.rules).repeated = {min_items: 1}];
}