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syntax = "proto3";

package envoy.api.v3alpha.core;

option java_outer_classname = "ConfigSourceProto";
option java_multiple_files = true;
option java_package = "io.envoyproxy.envoy.api.v3alpha.core";

import "envoy/api/v3alpha/core/grpc_service.proto";

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

import "validate/validate.proto";

// [#protodoc-title: Configuration sources]

// API configuration source. This identifies the API type and cluster that Envoy
// will use to fetch an xDS API.
message ApiConfigSource {
  // APIs may be fetched via either REST or gRPC.
  enum ApiType {
    // Ideally this would be 'reserved 0' but one can't reserve the default
    // value. Instead we throw an exception if this is ever used.
    UNSUPPORTED_REST_LEGACY = 0 [deprecated = true];
    // REST-JSON v2 API. The `canonical JSON encoding
    // `_ for
    // the v2 protos is used.
    REST = 1;
    // gRPC v2 API.
    GRPC = 2;
    // Using the delta xDS gRPC service, i.e. DeltaDiscovery{Request,Response}
    // rather than Discovery{Request,Response}. Rather than sending Envoy the entire state
    // with every update, the xDS server only sends what has changed since the last update.
    //
    // DELTA_GRPC is not yet entirely implemented! Initially, only CDS is available.
    // Do not use for other xDSes. TODO(fredlas) update/remove this warning when appropriate.
    DELTA_GRPC = 3;
  }
  ApiType api_type = 1 [(validate.rules).enum.defined_only = true];
  // Cluster names should be used only with REST. If > 1
  // cluster is defined, clusters will be cycled through if any kind of failure
  // occurs.
  //
  // .. note::
  //
  //  The cluster with name ``cluster_name`` must be statically defined and its
  //  type must not be ``EDS``.
  repeated string cluster_names = 2;

  // Multiple gRPC services be provided for GRPC. If > 1 cluster is defined,
  // services will be cycled through if any kind of failure occurs.
  repeated GrpcService grpc_services = 4;

  // For REST APIs, the delay between successive polls.
  google.protobuf.Duration refresh_delay = 3;

  // For REST APIs, the request timeout. If not set, a default value of 1s will be used.
  google.protobuf.Duration request_timeout = 5 [(validate.rules).duration.gt.seconds = 0];

  // For GRPC APIs, the rate limit settings. If present, discovery requests made by Envoy will be
  // rate limited.
  RateLimitSettings rate_limit_settings = 6;

  // Skip the node identifier in subsequent discovery requests for streaming gRPC config types.
  bool set_node_on_first_message_only = 7;
}

// Aggregated Discovery Service (ADS) options. This is currently empty, but when
// set in :ref:`ConfigSource ` can be used to
// specify that ADS is to be used.
message AggregatedConfigSource {
}

// Rate Limit settings to be applied for discovery requests made by Envoy.
message RateLimitSettings {
  // Maximum number of tokens to be used for rate limiting discovery request calls. If not set, a
  // default value of 100 will be used.
  google.protobuf.UInt32Value max_tokens = 1;

  // Rate at which tokens will be filled per second. If not set, a default fill rate of 10 tokens
  // per second will be used.
  google.protobuf.DoubleValue fill_rate = 2 [(validate.rules).double.gt = 0.0];
}

// Configuration for :ref:`listeners `, :ref:`clusters
// `, :ref:`routes
// `, :ref:`endpoints
// ` etc. may either be sourced from the
// filesystem or from an xDS API source. Filesystem configs are watched with
// inotify for updates.
message ConfigSource {
  oneof config_source_specifier {
    option (validate.required) = true;
    // Path on the filesystem to source and watch for configuration updates.
    //
    // .. note::
    //
    //  The path to the source must exist at config load time.
    //
    // .. note::
    //
    //   Envoy will only watch the file path for *moves.* This is because in general only moves
    //   are atomic. The same method of swapping files as is demonstrated in the
    //   :ref:`runtime documentation ` can be used here also.
    string path = 1;
    // API configuration source.
    ApiConfigSource api_config_source = 2;
    // When set, ADS will be used to fetch resources. The ADS API configuration
    // source in the bootstrap configuration is used.
    AggregatedConfigSource ads = 3;
  }

  // When this timeout is specified, Envoy will wait no longer than the specified time for first
  // config response on this xDS subscription during the :ref:`initialization process
  // `. After reaching the timeout, Envoy will move to the next
  // initialization phase, even if the first config is not delivered yet. The timer is activated
  // when the xDS API subscription starts, and is disarmed on first config update or on error. 0
  // means no timeout - Envoy will wait indefinitely for the first xDS config (unless another
  // timeout applies). The default is 15s.
  google.protobuf.Duration initial_fetch_timeout = 4;
}