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route_config_resource_type.go
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/
route_config_resource_type.go
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/*
*
* Copyright 2022 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package xdsresource
import (
"google.golang.org/grpc/internal/pretty"
"google.golang.org/grpc/xds/internal/xdsclient/xdsresource/version"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
)
const (
// RouteConfigTypeName represents the transport agnostic name for the
// route config resource.
RouteConfigTypeName = "RouteConfigResource"
)
var (
// Compile time interface checks.
_ Type = routeConfigResourceType{}
// Singleton instantiation of the resource type implementation.
routeConfigType = routeConfigResourceType{
resourceTypeState: resourceTypeState{
typeURL: version.V3RouteConfigURL,
typeName: "RouteConfigResource",
allResourcesRequiredInSotW: false,
},
}
)
// routeConfigResourceType provides the resource-type specific functionality for
// a RouteConfiguration resource.
//
// Implements the Type interface.
type routeConfigResourceType struct {
resourceTypeState
}
// Decode deserializes and validates an xDS resource serialized inside the
// provided `Any` proto, as received from the xDS management server.
func (routeConfigResourceType) Decode(opts *DecodeOptions, resource *anypb.Any) (*DecodeResult, error) {
name, rc, err := unmarshalRouteConfigResource(resource)
switch {
case name == "":
// Name is unset only when protobuf deserialization fails.
return nil, err
case err != nil:
// Protobuf deserialization succeeded, but resource validation failed.
return &DecodeResult{Name: name, Resource: &RouteConfigResourceData{Resource: RouteConfigUpdate{}}}, err
}
return &DecodeResult{Name: name, Resource: &RouteConfigResourceData{Resource: rc}}, nil
}
// RouteConfigResourceData wraps the configuration of a RouteConfiguration
// resource as received from the management server.
//
// Implements the ResourceData interface.
type RouteConfigResourceData struct {
ResourceData
// TODO: We have always stored update structs by value. See if this can be
// switched to a pointer?
Resource RouteConfigUpdate
}
// Equal returns true if other is equal to r.
func (r *RouteConfigResourceData) Equal(other ResourceData) bool {
if r == nil && other == nil {
return true
}
if (r == nil) != (other == nil) {
return false
}
return proto.Equal(r.Resource.Raw, other.Raw())
}
// ToJSON returns a JSON string representation of the resource data.
func (r *RouteConfigResourceData) ToJSON() string {
return pretty.ToJSON(r.Resource)
}
// Raw returns the underlying raw protobuf form of the route configuration
// resource.
func (r *RouteConfigResourceData) Raw() *anypb.Any {
return r.Resource.Raw
}
// RouteConfigWatcher wraps the callbacks to be invoked for different
// events corresponding to the route configuration resource being watched.
type RouteConfigWatcher interface {
// OnUpdate is invoked to report an update for the resource being watched.
OnUpdate(*RouteConfigResourceData)
// OnError is invoked under different error conditions including but not
// limited to the following:
// - authority mentioned in the resource is not found
// - resource name parsing error
// - resource deserialization error
// - resource validation error
// - ADS stream failure
// - connection failure
OnError(error)
// OnResourceDoesNotExist is invoked for a specific error condition where
// the requested resource is not found on the xDS management server.
OnResourceDoesNotExist()
}
type delegatingRouteConfigWatcher struct {
watcher RouteConfigWatcher
}
func (d *delegatingRouteConfigWatcher) OnUpdate(data ResourceData) {
rc := data.(*RouteConfigResourceData)
d.watcher.OnUpdate(rc)
}
func (d *delegatingRouteConfigWatcher) OnError(err error) {
d.watcher.OnError(err)
}
func (d *delegatingRouteConfigWatcher) OnResourceDoesNotExist() {
d.watcher.OnResourceDoesNotExist()
}
// WatchRouteConfig uses xDS to discover the configuration associated with the
// provided route configuration resource name.
func WatchRouteConfig(p Producer, name string, w RouteConfigWatcher) (cancel func()) {
delegator := &delegatingRouteConfigWatcher{watcher: w}
return p.WatchResource(routeConfigType, name, delegator)
}