102 lines
2.9 KiB
Go
102 lines
2.9 KiB
Go
|
// Copyright 2017 Google Inc. All Rights Reserved.
|
||
|
|
//
|
||
|
|
// 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 compiler
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"os/exec"
|
||
|
|
|
||
|
|
"strings"
|
||
|
|
|
||
|
|
"errors"
|
||
|
|
|
||
|
|
"github.com/golang/protobuf/proto"
|
||
|
|
"github.com/golang/protobuf/ptypes/any"
|
||
|
|
ext_plugin "github.com/googleapis/gnostic/extensions"
|
||
|
|
yaml "gopkg.in/yaml.v2"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ExtensionHandler describes a binary that is called by the compiler to handle specification extensions.
|
||
|
|
type ExtensionHandler struct {
|
||
|
|
Name string
|
||
|
|
}
|
||
|
|
|
||
|
|
// HandleExtension calls a binary extension handler.
|
||
|
|
func HandleExtension(context *Context, in interface{}, extensionName string) (bool, *any.Any, error) {
|
||
|
|
handled := false
|
||
|
|
var errFromPlugin error
|
||
|
|
var outFromPlugin *any.Any
|
||
|
|
|
||
|
|
if context != nil && context.ExtensionHandlers != nil && len(*(context.ExtensionHandlers)) != 0 {
|
||
|
|
for _, customAnyProtoGenerator := range *(context.ExtensionHandlers) {
|
||
|
|
outFromPlugin, errFromPlugin = customAnyProtoGenerator.handle(in, extensionName)
|
||
|
|
if outFromPlugin == nil {
|
||
|
|
continue
|
||
|
|
} else {
|
||
|
|
handled = true
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return handled, outFromPlugin, errFromPlugin
|
||
|
|
}
|
||
|
|
|
||
|
|
func (extensionHandlers *ExtensionHandler) handle(in interface{}, extensionName string) (*any.Any, error) {
|
||
|
|
if extensionHandlers.Name != "" {
|
||
|
|
binary, _ := yaml.Marshal(in)
|
||
|
|
|
||
|
|
request := &ext_plugin.ExtensionHandlerRequest{}
|
||
|
|
|
||
|
|
version := &ext_plugin.Version{}
|
||
|
|
version.Major = 0
|
||
|
|
version.Minor = 1
|
||
|
|
version.Patch = 0
|
||
|
|
request.CompilerVersion = version
|
||
|
|
|
||
|
|
request.Wrapper = &ext_plugin.Wrapper{}
|
||
|
|
|
||
|
|
request.Wrapper.Version = "v2"
|
||
|
|
request.Wrapper.Yaml = string(binary)
|
||
|
|
request.Wrapper.ExtensionName = extensionName
|
||
|
|
|
||
|
|
requestBytes, _ := proto.Marshal(request)
|
||
|
|
cmd := exec.Command(extensionHandlers.Name)
|
||
|
|
cmd.Stdin = bytes.NewReader(requestBytes)
|
||
|
|
output, err := cmd.Output()
|
||
|
|
|
||
|
|
if err != nil {
|
||
|
|
fmt.Printf("Error: %+v\n", err)
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
response := &ext_plugin.ExtensionHandlerResponse{}
|
||
|
|
err = proto.Unmarshal(output, response)
|
||
|
|
if err != nil {
|
||
|
|
fmt.Printf("Error: %+v\n", err)
|
||
|
|
fmt.Printf("%s\n", string(output))
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if !response.Handled {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
if len(response.Error) != 0 {
|
||
|
|
message := fmt.Sprintf("Errors when parsing: %+v for field %s by vendor extension handler %s. Details %+v", in, extensionName, extensionHandlers.Name, strings.Join(response.Error, ","))
|
||
|
|
return nil, errors.New(message)
|
||
|
|
}
|
||
|
|
return response.Value, nil
|
||
|
|
}
|
||
|
|
return nil, nil
|
||
|
|
}
|