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syntax = "proto3";
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package envoy.api.v2;
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import "envoy/api/v2/core/base.proto";
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import "google/protobuf/any.proto";
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import "google/rpc/status.proto";
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import "udpa/annotations/migrate.proto";
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option java_package = "io.envoyproxy.envoy.api.v2";
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option java_outer_classname = "DiscoveryProto";
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option java_multiple_files = true;
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option (udpa.annotations.file_migrate).move_to_package = "envoy.service.discovery.v3alpha";
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// [#protodoc-title: Common discovery API components]
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// A DiscoveryRequest requests a set of versioned resources of the same type for
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// a given Envoy node on some API.
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// [#next-free-field: 7]
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message DiscoveryRequest {
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// The version_info provided in the request messages will be the version_info
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// received with the most recent successfully processed response or empty on
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// the first request. It is expected that no new request is sent after a
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// response is received until the Envoy instance is ready to ACK/NACK the new
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// configuration. ACK/NACK takes place by returning the new API config version
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// as applied or the previous API config version respectively. Each type_url
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// (see below) has an independent version associated with it.
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string version_info = 1;
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// The node making the request.
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core.Node node = 2;
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// List of resources to subscribe to, e.g. list of cluster names or a route
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// configuration name. If this is empty, all resources for the API are
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// returned. LDS/CDS may have empty resource_names, which will cause all
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// resources for the Envoy instance to be returned. The LDS and CDS responses
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// will then imply a number of resources that need to be fetched via EDS/RDS,
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// which will be explicitly enumerated in resource_names.
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repeated string resource_names = 3;
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// Type of the resource that is being requested, e.g.
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// "type.googleapis.com/envoy.api.v2.ClusterLoadAssignment". This is implicit
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// in requests made via singleton xDS APIs such as CDS, LDS, etc. but is
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// required for ADS.
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string type_url = 4;
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// nonce corresponding to DiscoveryResponse being ACK/NACKed. See above
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// discussion on version_info and the DiscoveryResponse nonce comment. This
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// may be empty only if 1) this is a non-persistent-stream xDS such as HTTP,
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// or 2) the client has not yet accepted an update in this xDS stream (unlike
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// delta, where it is populated only for new explicit ACKs).
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string response_nonce = 5;
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// This is populated when the previous :ref:`DiscoveryResponse <envoy_api_msg_DiscoveryResponse>`
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// failed to update configuration. The *message* field in *error_details* provides the Envoy
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// internal exception related to the failure. It is only intended for consumption during manual
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// debugging, the string provided is not guaranteed to be stable across Envoy versions.
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google.rpc.Status error_detail = 6;
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}
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// [#next-free-field: 7]
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message DiscoveryResponse {
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// The version of the response data.
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string version_info = 1;
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// The response resources. These resources are typed and depend on the API being called.
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repeated google.protobuf.Any resources = 2;
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// [#not-implemented-hide:]
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// Canary is used to support two Envoy command line flags:
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//
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// * --terminate-on-canary-transition-failure. When set, Envoy is able to
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// terminate if it detects that configuration is stuck at canary. Consider
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// this example sequence of updates:
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// - Management server applies a canary config successfully.
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// - Management server rolls back to a production config.
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// - Envoy rejects the new production config.
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// Since there is no sensible way to continue receiving configuration
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// updates, Envoy will then terminate and apply production config from a
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// clean slate.
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// * --dry-run-canary. When set, a canary response will never be applied, only
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// validated via a dry run.
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bool canary = 3;
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// Type URL for resources. Identifies the xDS API when muxing over ADS.
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// Must be consistent with the type_url in the 'resources' repeated Any (if non-empty).
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string type_url = 4;
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// For gRPC based subscriptions, the nonce provides a way to explicitly ack a
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// specific DiscoveryResponse in a following DiscoveryRequest. Additional
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// messages may have been sent by Envoy to the management server for the
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// previous version on the stream prior to this DiscoveryResponse, that were
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// unprocessed at response send time. The nonce allows the management server
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// to ignore any further DiscoveryRequests for the previous version until a
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// DiscoveryRequest bearing the nonce. The nonce is optional and is not
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// required for non-stream based xDS implementations.
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string nonce = 5;
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// [#not-implemented-hide:]
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// The control plane instance that sent the response.
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core.ControlPlane control_plane = 6;
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}
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// DeltaDiscoveryRequest and DeltaDiscoveryResponse are used in a new gRPC
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// endpoint for Delta xDS.
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//
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// With Delta xDS, the DeltaDiscoveryResponses do not need to include a full
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// snapshot of the tracked resources. Instead, DeltaDiscoveryResponses are a
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// diff to the state of a xDS client.
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// In Delta XDS there are per-resource versions, which allow tracking state at
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// the resource granularity.
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// An xDS Delta session is always in the context of a gRPC bidirectional
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// stream. This allows the xDS server to keep track of the state of xDS clients
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// connected to it.
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//
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// In Delta xDS the nonce field is required and used to pair
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// DeltaDiscoveryResponse to a DeltaDiscoveryRequest ACK or NACK.
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// Optionally, a response message level system_version_info is present for
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// debugging purposes only.
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//
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// DeltaDiscoveryRequest plays two independent roles. Any DeltaDiscoveryRequest
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// can be either or both of: [1] informing the server of what resources the
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// client has gained/lost interest in (using resource_names_subscribe and
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// resource_names_unsubscribe), or [2] (N)ACKing an earlier resource update from
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// the server (using response_nonce, with presence of error_detail making it a NACK).
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// Additionally, the first message (for a given type_url) of a reconnected gRPC stream
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// has a third role: informing the server of the resources (and their versions)
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// that the client already possesses, using the initial_resource_versions field.
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//
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// As with state-of-the-world, when multiple resource types are multiplexed (ADS),
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// all requests/acknowledgments/updates are logically walled off by type_url:
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// a Cluster ACK exists in a completely separate world from a prior Route NACK.
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// In particular, initial_resource_versions being sent at the "start" of every
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// gRPC stream actually entails a message for each type_url, each with its own
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// initial_resource_versions.
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// [#next-free-field: 8]
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message DeltaDiscoveryRequest {
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// The node making the request.
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core.Node node = 1;
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// Type of the resource that is being requested, e.g.
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// "type.googleapis.com/envoy.api.v2.ClusterLoadAssignment".
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string type_url = 2;
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// DeltaDiscoveryRequests allow the client to add or remove individual
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// resources to the set of tracked resources in the context of a stream.
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// All resource names in the resource_names_subscribe list are added to the
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// set of tracked resources and all resource names in the resource_names_unsubscribe
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// list are removed from the set of tracked resources.
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//
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// *Unlike* state-of-the-world xDS, an empty resource_names_subscribe or
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// resource_names_unsubscribe list simply means that no resources are to be
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// added or removed to the resource list.
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// *Like* state-of-the-world xDS, the server must send updates for all tracked
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// resources, but can also send updates for resources the client has not subscribed to.
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//
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// NOTE: the server must respond with all resources listed in resource_names_subscribe,
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// even if it believes the client has the most recent version of them. The reason:
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// the client may have dropped them, but then regained interest before it had a chance
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// to send the unsubscribe message. See DeltaSubscriptionStateTest.RemoveThenAdd.
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//
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// These two fields can be set in any DeltaDiscoveryRequest, including ACKs
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// and initial_resource_versions.
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//
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// A list of Resource names to add to the list of tracked resources.
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repeated string resource_names_subscribe = 3;
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// A list of Resource names to remove from the list of tracked resources.
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repeated string resource_names_unsubscribe = 4;
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// Informs the server of the versions of the resources the xDS client knows of, to enable the
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// client to continue the same logical xDS session even in the face of gRPC stream reconnection.
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// It will not be populated: [1] in the very first stream of a session, since the client will
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// not yet have any resources, [2] in any message after the first in a stream (for a given
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// type_url), since the server will already be correctly tracking the client's state.
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// (In ADS, the first message *of each type_url* of a reconnected stream populates this map.)
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// The map's keys are names of xDS resources known to the xDS client.
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// The map's values are opaque resource versions.
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map<string, string> initial_resource_versions = 5;
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// When the DeltaDiscoveryRequest is a ACK or NACK message in response
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// to a previous DeltaDiscoveryResponse, the response_nonce must be the
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// nonce in the DeltaDiscoveryResponse.
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// Otherwise (unlike in DiscoveryRequest) response_nonce must be omitted.
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string response_nonce = 6;
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// This is populated when the previous :ref:`DiscoveryResponse <envoy_api_msg_DiscoveryResponse>`
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// failed to update configuration. The *message* field in *error_details*
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// provides the Envoy internal exception related to the failure.
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google.rpc.Status error_detail = 7;
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}
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// [#next-free-field: 7]
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message DeltaDiscoveryResponse {
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// The version of the response data (used for debugging).
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string system_version_info = 1;
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// The response resources. These are typed resources, whose types must match
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// the type_url field.
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repeated Resource resources = 2;
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// field id 3 IS available!
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// Type URL for resources. Identifies the xDS API when muxing over ADS.
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// Must be consistent with the type_url in the Any within 'resources' if 'resources' is non-empty.
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string type_url = 4;
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// Resources names of resources that have be deleted and to be removed from the xDS Client.
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// Removed resources for missing resources can be ignored.
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repeated string removed_resources = 6;
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// The nonce provides a way for DeltaDiscoveryRequests to uniquely
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// reference a DeltaDiscoveryResponse when (N)ACKing. The nonce is required.
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string nonce = 5;
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}
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message Resource {
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// The resource's name, to distinguish it from others of the same type of resource.
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string name = 3;
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// The aliases are a list of other names that this resource can go by.
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repeated string aliases = 4;
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// The resource level version. It allows xDS to track the state of individual
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// resources.
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string version = 1;
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// The resource being tracked.
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google.protobuf.Any resource = 2;
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}
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