86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
// Copyright 2017 Google LLC. 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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"github.com/golang/protobuf/proto"
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"github.com/golang/protobuf/ptypes/any"
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extensions "github.com/googleapis/gnostic/extensions"
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yaml "gopkg.in/yaml.v3"
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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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// CallExtension calls a binary extension handler.
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func CallExtension(context *Context, in *yaml.Node, extensionName string) (handled bool, response *any.Any, err error) {
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if context == nil || context.ExtensionHandlers == nil {
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return false, nil, nil
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}
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handled = false
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for _, handler := range *(context.ExtensionHandlers) {
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response, err = handler.handle(in, extensionName)
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if response == 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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return handled, response, err
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}
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func (extensionHandlers *ExtensionHandler) handle(in *yaml.Node, extensionName string) (*any.Any, error) {
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if extensionHandlers.Name != "" {
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yamlData, _ := yaml.Marshal(in)
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request := &extensions.ExtensionHandlerRequest{
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CompilerVersion: &extensions.Version{
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Major: 0,
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Minor: 1,
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Patch: 0,
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},
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Wrapper: &extensions.Wrapper{
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Version: "unknown", // TODO: set this to the type/version of spec being parsed.
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Yaml: string(yamlData),
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ExtensionName: extensionName,
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},
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}
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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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return nil, err
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}
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response := &extensions.ExtensionHandlerResponse{}
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err = proto.Unmarshal(output, response)
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if err != nil || !response.Handled {
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return nil, err
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}
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if len(response.Errors) != 0 {
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return nil, fmt.Errorf("Errors when parsing: %+v for field %s by vendor extension handler %s. Details %+v", in, extensionName, extensionHandlers.Name, strings.Join(response.Errors, ","))
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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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