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resolver.go
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resolver.go
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// Copyright 2020-2023 Buf Technologies, Inc.
//
// 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 bufcurl
import (
"fmt"
"strings"
"sync"
"github.com/xiaoyawei/buf/private/bufpkg/bufimage"
"google.golang.org/protobuf/reflect/protodesc"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/dynamicpb"
)
// ResolveMethodDescriptor uses the given resolver to find a descriptor for
// the requested service and method. The service name must be fully-qualified.
func ResolveMethodDescriptor(res Resolver, service, method string) (protoreflect.MethodDescriptor, error) {
descriptor, err := res.FindDescriptorByName(protoreflect.FullName(service))
if err == protoregistry.NotFound {
return nil, fmt.Errorf("failed to find service named %q in schema", service)
} else if err != nil {
return nil, err
}
serviceDescriptor, ok := descriptor.(protoreflect.ServiceDescriptor)
if !ok {
return nil, fmt.Errorf("URL indicates service name %q, but that name is a %s", service, DescriptorKind(descriptor))
}
methodDescriptor := serviceDescriptor.Methods().ByName(protoreflect.Name(method))
if methodDescriptor == nil {
return nil, fmt.Errorf("URL indicates method name %q, but service %q contains no such method", method, service)
}
return methodDescriptor, nil
}
// NewImageResolver returns a Resolver that uses the given image to resolve
// symbols and extensions.
func NewImageResolver(image bufimage.Image) (Resolver, error) {
files, err := protodesc.NewFiles(&descriptorpb.FileDescriptorSet{
File: bufimage.ImageToFileDescriptorProtos(image),
})
if err != nil {
return nil, err
}
return &imageResolver{
files: files,
}, nil
}
type imageResolver struct {
files *protoregistry.Files
initExts sync.Once
exts *protoregistry.Types
}
func (i *imageResolver) FindDescriptorByName(name protoreflect.FullName) (protoreflect.Descriptor, error) {
return i.files.FindDescriptorByName(name)
}
func (i *imageResolver) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
d, err := i.files.FindDescriptorByName(message)
if err != nil {
return nil, err
}
md, ok := d.(protoreflect.MessageDescriptor)
if !ok {
return nil, fmt.Errorf("element %s is a %s, not a message", message, DescriptorKind(d))
}
return dynamicpb.NewMessageType(md), nil
}
func (i *imageResolver) FindMessageByURL(url string) (protoreflect.MessageType, error) {
pos := strings.LastIndexByte(url, '/')
typeName := url[pos+1:]
return i.FindMessageByName(protoreflect.FullName(typeName))
}
func (i *imageResolver) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
d, err := i.files.FindDescriptorByName(field)
if err != nil {
return nil, err
}
fd, ok := d.(protoreflect.FieldDescriptor)
if !ok || !fd.IsExtension() {
return nil, fmt.Errorf("element %s is a %s, not an extension", field, DescriptorKind(d))
}
return dynamicpb.NewExtensionType(fd), nil
}
func (i *imageResolver) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
// Most usages won't need to resolve extensions. So instead of proactively
// indexing them, we defer that work until it's actually needed.
i.initExts.Do(i.doInitExts)
return i.exts.FindExtensionByNumber(message, field)
}
func (i *imageResolver) doInitExts() {
var types protoregistry.Types
i.files.RangeFiles(func(fd protoreflect.FileDescriptor) bool {
registerExtensions(&types, fd)
return true
})
i.exts = &types
}
type extensionContainer interface {
Messages() protoreflect.MessageDescriptors
Extensions() protoreflect.ExtensionDescriptors
}
func registerExtensions(reg *protoregistry.Types, descriptor extensionContainer) {
exts := descriptor.Extensions()
for i := 0; i < exts.Len(); i++ {
extType := dynamicpb.NewExtensionType(exts.Get(i))
_ = reg.RegisterExtension(extType)
}
msgs := descriptor.Messages()
for i := 0; i < msgs.Len(); i++ {
registerExtensions(reg, msgs.Get(i))
}
}
// DescriptorKind returns a succinct description of the type of the given descriptor.
func DescriptorKind(d protoreflect.Descriptor) string {
switch d := d.(type) {
case protoreflect.FileDescriptor:
return "file"
case protoreflect.MessageDescriptor:
return "message"
case protoreflect.FieldDescriptor:
if d.IsExtension() {
return "extension"
}
return "field"
case protoreflect.OneofDescriptor:
return "oneof"
case protoreflect.EnumDescriptor:
return "enum"
case protoreflect.EnumValueDescriptor:
return "enum value"
case protoreflect.ServiceDescriptor:
return "service"
case protoreflect.MethodDescriptor:
return "method"
default:
return fmt.Sprintf("%T", d)
}
}