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// Copyright 2017 Google LLC. 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 gnostic_extension_v1
import (
"io/ioutil"
"log"
"os"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
)
type extensionHandler func(name string, yamlInput string) (bool, proto.Message, error)
// Main implements the main program of an extension handler.
func Main(handler extensionHandler) {
// unpack the request
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Println("File error:", err.Error())
os.Exit(1)
}
if len(data) == 0 {
log.Println("No input data.")
os.Exit(1)
}
request := &ExtensionHandlerRequest{}
err = proto.Unmarshal(data, request)
if err != nil {
log.Println("Input error:", err.Error())
os.Exit(1)
}
// call the handler
handled, output, err := handler(request.Wrapper.ExtensionName, request.Wrapper.Yaml)
// respond with the output of the handler
response := &ExtensionHandlerResponse{
Handled: false, // default assumption
Errors: make([]string, 0),
}
if err != nil {
response.Errors = append(response.Errors, err.Error())
} else if handled {
response.Handled = true
response.Value, err = anypb.New(output)
if err != nil {
response.Errors = append(response.Errors, err.Error())
}
}
responseBytes, _ := proto.Marshal(response)
os.Stdout.Write(responseBytes)
}
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