/
descriptor.go
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/
descriptor.go
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// Copyright 2016 The LUCI 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 (
"context"
"fmt"
"strings"
"github.com/TriggerMail/luci-go/common/proto/google/descutil"
"github.com/golang/protobuf/protoc-gen-go/descriptor"
"github.com/TriggerMail/luci-go/grpc/discovery"
"github.com/TriggerMail/luci-go/grpc/prpc"
)
type serverDescription struct {
*discovery.DescribeResponse
}
func loadDescription(c context.Context, client *prpc.Client) (*serverDescription, error) {
dc := discovery.NewDiscoveryPRPCClient(client)
res, err := dc.Describe(c, &discovery.Void{})
if err != nil {
return nil, fmt.Errorf("could not load server description: %s", err)
}
return &serverDescription{res}, nil
}
// resolveInputMessage resolves input message type of a method.
func (d *serverDescription) resolveInputMessage(service, method string) (*descriptor.DescriptorProto, error) {
_, obj, _ := descutil.Resolve(d.Description, service)
serviceDesc, ok := obj.(*descriptor.ServiceDescriptorProto)
if !ok {
return nil, fmt.Errorf("service %q not found", service)
}
mi := descutil.FindMethodForService(serviceDesc, method)
if mi == -1 {
return nil, fmt.Errorf("method %q in service %q not found", method, service)
}
msgName := serviceDesc.Method[mi].GetInputType()
msgName = strings.TrimPrefix(msgName, ".")
return d.resolveMessage(msgName)
}
func (d *serverDescription) resolveMessage(name string) (*descriptor.DescriptorProto, error) {
_, obj, _ := descutil.Resolve(d.Description, name)
msg, ok := obj.(*descriptor.DescriptorProto)
if !ok {
return nil, fmt.Errorf("message %q not found", name)
}
return msg, nil
}