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// Copyright 2018 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 server
import (
"errors"
"fmt"
"io"
"net/http"
"path"
"google.golang.org/protobuf/encoding/protojson"
discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
"github.com/envoyproxy/go-control-plane/pkg/cache/types"
"github.com/envoyproxy/go-control-plane/pkg/resource/v3"
)
// HTTPGateway is a custom implementation of [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway)
// specialized to Envoy xDS API.
type HTTPGateway struct {
// Server is the underlying gRPC server
Server Server
}
func (h *HTTPGateway) ServeHTTP(req *http.Request) ([]byte, int, error) {
p := path.Clean(req.URL.Path)
typeURL := ""
switch p {
case resource.FetchEndpoints:
typeURL = resource.EndpointType
case resource.FetchClusters:
typeURL = resource.ClusterType
case resource.FetchListeners:
typeURL = resource.ListenerType
case resource.FetchRoutes:
typeURL = resource.RouteType
case resource.FetchScopedRoutes:
typeURL = resource.ScopedRouteType
case resource.FetchSecrets:
typeURL = resource.SecretType
case resource.FetchRuntimes:
typeURL = resource.RuntimeType
case resource.FetchExtensionConfigs:
typeURL = resource.ExtensionConfigType
default:
return nil, http.StatusNotFound, fmt.Errorf("no endpoint")
}
if req.Body == nil {
return nil, http.StatusBadRequest, fmt.Errorf("empty body")
}
body, err := io.ReadAll(req.Body)
if err != nil {
return nil, http.StatusBadRequest, fmt.Errorf("cannot read body")
}
// parse as JSON
out := &discovery.DiscoveryRequest{}
err = protojson.Unmarshal(body, out)
if err != nil {
return nil, http.StatusBadRequest, fmt.Errorf("cannot parse JSON body: " + err.Error())
}
out.TypeUrl = typeURL
// fetch results
res, err := h.Server.Fetch(req.Context(), out)
if err != nil {
// SkipFetchErrors will return a 304 which will signify to the envoy client that
// it is already at the latest version; all other errors will 500 with a message.
var skip *types.SkipFetchError
if ok := errors.As(err, &skip); ok {
return nil, http.StatusNotModified, nil
}
return nil, http.StatusInternalServerError, fmt.Errorf("fetch error: " + err.Error())
}
b, err := protojson.MarshalOptions{UseProtoNames: true}.Marshal(res)
if err != nil {
return nil, http.StatusInternalServerError, fmt.Errorf("marshal error: " + err.Error())
}
return b, http.StatusOK, nil
}
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