101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package compiler
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import (
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"bytes"
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"fmt"
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"os/exec"
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"strings"
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"errors"
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"github.com/golang/protobuf/proto"
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"github.com/golang/protobuf/ptypes/any"
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ext_plugin "github.com/googleapis/gnostic/extensions"
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yaml "gopkg.in/yaml.v2"
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)
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// ExtensionHandler describes a binary that is called by the compiler to handle specification extensions.
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type ExtensionHandler struct {
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Name string
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}
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// HandleExtension calls a binary extension handler.
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func HandleExtension(context *Context, in interface{}, extensionName string) (bool, *any.Any, error) {
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handled := false
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var errFromPlugin error
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var outFromPlugin *any.Any
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if context != nil && context.ExtensionHandlers != nil && len(*(context.ExtensionHandlers)) != 0 {
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for _, customAnyProtoGenerator := range *(context.ExtensionHandlers) {
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outFromPlugin, errFromPlugin = customAnyProtoGenerator.handle(in, extensionName)
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if outFromPlugin == nil {
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continue
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} else {
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handled = true
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break
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}
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}
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}
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return handled, outFromPlugin, errFromPlugin
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}
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func (extensionHandlers *ExtensionHandler) handle(in interface{}, extensionName string) (*any.Any, error) {
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if extensionHandlers.Name != "" {
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binary, _ := yaml.Marshal(in)
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request := &ext_plugin.ExtensionHandlerRequest{}
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version := &ext_plugin.Version{}
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version.Major = 0
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version.Minor = 1
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version.Patch = 0
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request.CompilerVersion = version
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request.Wrapper = &ext_plugin.Wrapper{}
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request.Wrapper.Version = "v2"
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request.Wrapper.Yaml = string(binary)
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request.Wrapper.ExtensionName = extensionName
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requestBytes, _ := proto.Marshal(request)
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cmd := exec.Command(extensionHandlers.Name)
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cmd.Stdin = bytes.NewReader(requestBytes)
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output, err := cmd.Output()
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if err != nil {
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fmt.Printf("Error: %+v\n", err)
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return nil, err
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}
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response := &ext_plugin.ExtensionHandlerResponse{}
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err = proto.Unmarshal(output, response)
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if err != nil {
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fmt.Printf("Error: %+v\n", err)
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fmt.Printf("%s\n", string(output))
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return nil, err
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}
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if !response.Handled {
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return nil, nil
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}
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if len(response.Error) != 0 {
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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, ","))
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return nil, errors.New(message)
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}
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return response.Value, nil
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}
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return nil, nil
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}
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