forked from github/multus-cni
ac21a96804
gomodule is still in progress to migrate for now, hence multus team decide to keep vendor directory to support build without gomodule.
102 lines
2.9 KiB
Go
102 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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