resource.go

// Copyright 2020 Envoyproxy 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 main

import (
	"strconv"

	endpoint "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
	"github.com/envoyproxy/go-control-plane/pkg/cache/types"
	"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
	"github.com/envoyproxy/go-control-plane/pkg/resource/v3"
)

type EdsResource struct {
	ClusterName     string
	WebServer       *HttpServer
	NodeId          string
	SnapshotVersion int
}

func (er *EdsResource) makeEndpoint() *endpoint.ClusterLoadAssignment {
	return &endpoint.ClusterLoadAssignment{
		ClusterName: er.ClusterName,
		Endpoints: []*endpoint.LocalityLbEndpoints{{
			LbEndpoints: er.WebServer.GetEndpoints(),
		}},
	}
}

func (er *EdsResource) GenerateSnapshot() cache.Snapshot {
	snap, _ := cache.NewSnapshot(strconv.Itoa(er.SnapshotVersion),
		map[resource.Type][]types.Resource{
			resource.EndpointType: {er.makeEndpoint()},
		},
	)
	er.SnapshotVersion++
	return snap
}