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generate_config_crd_types.go
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generate_config_crd_types.go
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// Copyright 2018 Istio Authors
//
// 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.
// Tool to generate pilot/pkg/config/kube/types.go
// Example run command:
// go run pilot/tools/generate_config_crd_types.go --template pilot/tools/types.go.tmpl --output pilot/pkg/config/kube/crd/types.go
package main
import (
"bytes"
"flag"
"fmt"
"go/format"
"io/ioutil"
"log"
"text/template"
"istio.io/istio/pilot/pkg/config/kube/crd"
"istio.io/istio/pilot/pkg/model"
)
// ConfigData is data sturct to feed to types.go template.
type ConfigData struct {
IstioKind string
CrdKind string
}
// MakeConfigData prepare data for code generation for the given schema.
func MakeConfigData(schema model.ProtoSchema) ConfigData {
out := ConfigData{
IstioKind: crd.KabobCaseToCamelCase(schema.Type),
CrdKind: crd.KabobCaseToCamelCase(schema.Type),
}
// Tweak to match current naming.
// TODO(xiaolanz): change to meet the new naming convention.
if schema.Group == "authentication" {
out.IstioKind = crd.KabobCaseToCamelCase(schema.Group + "-" + schema.Type)
}
log.Printf("Generating Istio type %s for %s.%s CRD\n", out.IstioKind, out.CrdKind, schema.Group)
return out
}
func main() {
templateFile := flag.String("template", "pilot/tools/types.go.tmpl", "Template file")
outputFile := flag.String("output", "", "Output file. Leave blank to go to stdout")
flag.Parse()
tmpl := template.Must(template.ParseFiles(*templateFile))
// Prepare to generate types for mock schema and all schema listed in model.IstioConfigTypes
typeList := []ConfigData{
MakeConfigData(model.MockConfig),
}
for _, schema := range model.IstioConfigTypes {
typeList = append(typeList, MakeConfigData(schema))
}
var buffer bytes.Buffer
if err := tmpl.Execute(&buffer, typeList); err != nil {
log.Fatal(err)
}
// Format source code.
out, err := format.Source(buffer.Bytes())
if err != nil {
log.Fatal(err)
}
// Output
if outputFile == nil || *outputFile == "" {
fmt.Println(string(out))
} else {
if err := ioutil.WriteFile(*outputFile, out, 0644); err != nil {
panic(err)
}
}
}