multiversion.go

// Copyright 2019 Google LLC
//
// 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
//
//     https://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 crd

import (
	"fmt"
	"go/build"
	"io/ioutil"
	"log"
	"path/filepath"

	"github.com/spf13/afero"
)

type MultiVersionOptions struct {
	// InputPackage is the path of the input package that contains source files.
	InputPackage string
	// Types is a list of target types.
	Types []string

	// fs is provided FS. We can use afero.NewMemFs() for testing.
	fs afero.Fs
}

type MultiVersionGenerator struct {
	MultiVersionOptions
	WriterOptions
}

func (op *MultiVersionGenerator) Generate() {
	if len(op.InputPackage) == 0 || len(op.OutputPath) == 0 {
		log.Panic("Both input path and output paths need to be set")
	}

	if op.fs == nil {
		op.fs = afero.NewOsFs()
	}

	op.crdSpecs = op.parse()

	op.write(true, op.Types)
}

func listDirs(path string) ([]string, error) {
	pkg, err := build.Import(path, "", 0)
	if err != nil {
		return nil, err
	}
	infos, err := ioutil.ReadDir(pkg.Dir)
	if err != nil {
		return nil, err
	}
	var dirs []string
	for _, info := range infos {
		if info.IsDir() {
			dirs = append(dirs, info.Name())
		}
	}
	return dirs, nil
}

func (op *MultiVersionOptions) parse() crdSpecByKind {
	startingPointMap := make(map[string]bool)
	for i := range op.Types {
		startingPointMap[op.Types[i]] = true
	}

	dirs, err := listDirs(op.InputPackage)
	if err != nil {
		panic(err)
	}
	fmt.Println(dirs)

	crdSpecs := crdSpecByKind{}
	for _, dir := range dirs {
		singleVer := SingleVersionOptions{
			Types:        op.Types,
			InputPackage: filepath.Join(op.InputPackage, dir),
			Flatten:      false,
			fs:           op.fs,
		}
		_, crdSingleVersionSpecs := singleVer.parse()
		// merge crd versions
		err = mergeCRDVersions(crdSpecs, crdSingleVersionSpecs)
		if err != nil {
			panic(err)
		}
	}

	return crdSpecs
}