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syntax = "proto3";
package envoy.api.v2;
import "envoy/api/v2/core/base.proto";
import "google/protobuf/any.proto";
import "google/rpc/status.proto";
import "udpa/annotations/migrate.proto";
import "udpa/annotations/status.proto";
option java_package = "io.envoyproxy.envoy.api.v2";
option java_outer_classname = "DiscoveryProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/api/v2;apiv2";
option (udpa.annotations.file_migrate).move_to_package = "envoy.service.discovery.v3";
option (udpa.annotations.file_status).package_version_status = FROZEN;
// [#protodoc-title: Common discovery API components]
// A DiscoveryRequest requests a set of versioned resources of the same type for
// a given Envoy node on some API.
// [#next-free-field: 7]
message DiscoveryRequest {
// The version_info provided in the request messages will be the version_info
// received with the most recent successfully processed response or empty on
// the first request. It is expected that no new request is sent after a
// response is received until the Envoy instance is ready to ACK/NACK the new
// configuration. ACK/NACK takes place by returning the new API config version
// as applied or the previous API config version respectively. Each type_url
// (see below) has an independent version associated with it.
string version_info = 1;
// The node making the request.
core.Node node = 2;
// List of resources to subscribe to, e.g. list of cluster names or a route
// configuration name. If this is empty, all resources for the API are
// returned. LDS/CDS may have empty resource_names, which will cause all
// resources for the Envoy instance to be returned. The LDS and CDS responses
// will then imply a number of resources that need to be fetched via EDS/RDS,
// which will be explicitly enumerated in resource_names.
repeated string resource_names = 3;
// Type of the resource that is being requested, e.g.
// "type.googleapis.com/envoy.api.v2.ClusterLoadAssignment". This is implicit
// in requests made via singleton xDS APIs such as CDS, LDS, etc. but is
// required for ADS.
string type_url = 4;
// nonce corresponding to DiscoveryResponse being ACK/NACKed. See above
// discussion on version_info and the DiscoveryResponse nonce comment. This
// may be empty only if 1) this is a non-persistent-stream xDS such as HTTP,
// or 2) the client has not yet accepted an update in this xDS stream (unlike
// delta, where it is populated only for new explicit ACKs).
string response_nonce = 5;
// This is populated when the previous :ref:`DiscoveryResponse `
// failed to update configuration. The *message* field in *error_details* provides the Envoy
// internal exception related to the failure. It is only intended for consumption during manual
// debugging, the string provided is not guaranteed to be stable across Envoy versions.
google.rpc.Status error_detail = 6;
}
// [#next-free-field: 7]
message DiscoveryResponse {
// The version of the response data.
string version_info = 1;
// The response resources. These resources are typed and depend on the API being called.
repeated google.protobuf.Any resources = 2;
// [#not-implemented-hide:]
// Canary is used to support two Envoy command line flags:
//
// * --terminate-on-canary-transition-failure. When set, Envoy is able to
// terminate if it detects that configuration is stuck at canary. Consider
// this example sequence of updates:
// - Management server applies a canary config successfully.
// - Management server rolls back to a production config.
// - Envoy rejects the new production config.
// Since there is no sensible way to continue receiving configuration
// updates, Envoy will then terminate and apply production config from a
// clean slate.
// * --dry-run-canary. When set, a canary response will never be applied, only
// validated via a dry run.
bool canary = 3;
// Type URL for resources. Identifies the xDS API when muxing over ADS.
// Must be consistent with the type_url in the 'resources' repeated Any (if non-empty).
string type_url = 4;
// For gRPC based subscriptions, the nonce provides a way to explicitly ack a
// specific DiscoveryResponse in a following DiscoveryRequest. Additional
// messages may have been sent by Envoy to the management server for the
// previous version on the stream prior to this DiscoveryResponse, that were
// unprocessed at response send time. The nonce allows the management server
// to ignore any further DiscoveryRequests for the previous version until a
// DiscoveryRequest bearing the nonce. The nonce is optional and is not
// required for non-stream based xDS implementations.
string nonce = 5;
// [#not-implemented-hide:]
// The control plane instance that sent the response.
core.ControlPlane control_plane = 6;
}
// DeltaDiscoveryRequest and DeltaDiscoveryResponse are used in a new gRPC
// endpoint for Delta xDS.
//
// With Delta xDS, the DeltaDiscoveryResponses do not need to include a full
// snapshot of the tracked resources. Instead, DeltaDiscoveryResponses are a
// diff to the state of a xDS client.
// In Delta XDS there are per-resource versions, which allow tracking state at
// the resource granularity.
// An xDS Delta session is always in the context of a gRPC bidirectional
// stream. This allows the xDS server to keep track of the state of xDS clients
// connected to it.
//
// In Delta xDS the nonce field is required and used to pair
// DeltaDiscoveryResponse to a DeltaDiscoveryRequest ACK or NACK.
// Optionally, a response message level system_version_info is present for
// debugging purposes only.
//
// DeltaDiscoveryRequest plays two independent roles. Any DeltaDiscoveryRequest
// can be either or both of: [1] informing the server of what resources the
// client has gained/lost interest in (using resource_names_subscribe and
// resource_names_unsubscribe), or [2] (N)ACKing an earlier resource update from
// the server (using response_nonce, with presence of error_detail making it a NACK).
// Additionally, the first message (for a given type_url) of a reconnected gRPC stream
// has a third role: informing the server of the resources (and their versions)
// that the client already possesses, using the initial_resource_versions field.
//
// As with state-of-the-world, when multiple resource types are multiplexed (ADS),
// all requests/acknowledgments/updates are logically walled off by type_url:
// a Cluster ACK exists in a completely separate world from a prior Route NACK.
// In particular, initial_resource_versions being sent at the "start" of every
// gRPC stream actually entails a message for each type_url, each with its own
// initial_resource_versions.
// [#next-free-field: 8]
message DeltaDiscoveryRequest {
// The node making the request.
core.Node node = 1;
// Type of the resource that is being requested, e.g.
// "type.googleapis.com/envoy.api.v2.ClusterLoadAssignment".
string type_url = 2;
// DeltaDiscoveryRequests allow the client to add or remove individual
// resources to the set of tracked resources in the context of a stream.
// All resource names in the resource_names_subscribe list are added to the
// set of tracked resources and all resource names in the resource_names_unsubscribe
// list are removed from the set of tracked resources.
//
// *Unlike* state-of-the-world xDS, an empty resource_names_subscribe or
// resource_names_unsubscribe list simply means that no resources are to be
// added or removed to the resource list.
// *Like* state-of-the-world xDS, the server must send updates for all tracked
// resources, but can also send updates for resources the client has not subscribed to.
//
// NOTE: the server must respond with all resources listed in resource_names_subscribe,
// even if it believes the client has the most recent version of them. The reason:
// the client may have dropped them, but then regained interest before it had a chance
// to send the unsubscribe message. See DeltaSubscriptionStateTest.RemoveThenAdd.
//
// These two fields can be set in any DeltaDiscoveryRequest, including ACKs
// and initial_resource_versions.
//
// A list of Resource names to add to the list of tracked resources.
repeated string resource_names_subscribe = 3;
// A list of Resource names to remove from the list of tracked resources.
repeated string resource_names_unsubscribe = 4;
// Informs the server of the versions of the resources the xDS client knows of, to enable the
// client to continue the same logical xDS session even in the face of gRPC stream reconnection.
// It will not be populated: [1] in the very first stream of a session, since the client will
// not yet have any resources, [2] in any message after the first in a stream (for a given
// type_url), since the server will already be correctly tracking the client's state.
// (In ADS, the first message *of each type_url* of a reconnected stream populates this map.)
// The map's keys are names of xDS resources known to the xDS client.
// The map's values are opaque resource versions.
map initial_resource_versions = 5;
// When the DeltaDiscoveryRequest is a ACK or NACK message in response
// to a previous DeltaDiscoveryResponse, the response_nonce must be the
// nonce in the DeltaDiscoveryResponse.
// Otherwise (unlike in DiscoveryRequest) response_nonce must be omitted.
string response_nonce = 6;
// This is populated when the previous :ref:`DiscoveryResponse `
// failed to update configuration. The *message* field in *error_details*
// provides the Envoy internal exception related to the failure.
google.rpc.Status error_detail = 7;
}
// [#next-free-field: 7]
message DeltaDiscoveryResponse {
// The version of the response data (used for debugging).
string system_version_info = 1;
// The response resources. These are typed resources, whose types must match
// the type_url field.
repeated Resource resources = 2;
// field id 3 IS available!
// Type URL for resources. Identifies the xDS API when muxing over ADS.
// Must be consistent with the type_url in the Any within 'resources' if 'resources' is non-empty.
string type_url = 4;
// Resources names of resources that have be deleted and to be removed from the xDS Client.
// Removed resources for missing resources can be ignored.
repeated string removed_resources = 6;
// The nonce provides a way for DeltaDiscoveryRequests to uniquely
// reference a DeltaDiscoveryResponse when (N)ACKing. The nonce is required.
string nonce = 5;
}
message Resource {
// The resource's name, to distinguish it from others of the same type of resource.
string name = 3;
// The aliases are a list of other names that this resource can go by.
repeated string aliases = 4;
// The resource level version. It allows xDS to track the state of individual
// resources.
string version = 1;
// The resource being tracked.
google.protobuf.Any resource = 2;
}
