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// 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 rest provides an implementation of REST-JSON part of XDS server
package rest
import (
"context"
"errors"
discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
"github.com/envoyproxy/go-control-plane/pkg/cache/v3"
)
type Server interface {
Fetch(context.Context, *discovery.DiscoveryRequest) (*discovery.DiscoveryResponse, error)
}
type Callbacks interface {
// OnFetchRequest is called for each Fetch request. Returning an error will end processing of the
// request and respond with an error.
OnFetchRequest(context.Context, *discovery.DiscoveryRequest) error
// OnFetchResponse is called immediately prior to sending a response.
OnFetchResponse(*discovery.DiscoveryRequest, *discovery.DiscoveryResponse)
}
func NewServer(config cache.ConfigFetcher, callbacks Callbacks) Server {
return &server{cache: config, callbacks: callbacks}
}
type server struct {
cache cache.ConfigFetcher
callbacks Callbacks
}
func (s *server) Fetch(ctx context.Context, req *discovery.DiscoveryRequest) (*discovery.DiscoveryResponse, error) {
if s.callbacks != nil {
if err := s.callbacks.OnFetchRequest(ctx, req); err != nil {
return nil, err
}
}
resp, err := s.cache.Fetch(ctx, req)
if err != nil {
return nil, err
}
if resp == nil {
return nil, errors.New("missing response")
}
out, err := resp.GetDiscoveryResponse()
if s.callbacks != nil {
s.callbacks.OnFetchResponse(req, out)
}
return out, err
}
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