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extract.go
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extract.go
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/*
* Copyright 2018- The Pixie 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package yamls
import (
"archive/tar"
"errors"
"fmt"
"os"
"path"
)
// ExtractYAMLFormat represents the types of formats we can extract YAMLs to.
type ExtractYAMLFormat int
const (
// UnknownExtractYAMLFormat is an extraction format.
UnknownExtractYAMLFormat ExtractYAMLFormat = iota
// SingleFileExtractYAMLFormat extracts YAMLs to single file.
SingleFileExtractYAMLFormat
// MultiFileExtractYAMLFormat extract YAMLs into multiple files, according to type.
MultiFileExtractYAMLFormat
)
// YAMLFile is a YAML associated with a name.
type YAMLFile struct {
Name string
YAML string
}
// ConcatYAMLs concatenates two separate YAMLs.
func ConcatYAMLs(y1 string, y2 string) string {
return y1 + "---\n" + y2
}
// ExtractYAMLs writes the generated YAMLs to a tar at the given path in the given format.
func ExtractYAMLs(yamls []*YAMLFile, extractPath string, yamlDir string, format ExtractYAMLFormat) error {
writeYAML := func(w *tar.Writer, name string, contents string) error {
if err := w.WriteHeader(&tar.Header{Name: name, Size: int64(len(contents)), Mode: 0777}); err != nil {
return err
}
if _, err := w.Write([]byte(contents)); err != nil {
return err
}
return nil
}
filePath := path.Join(extractPath, "yamls.tar")
writer, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE, 0755)
if err != nil {
return fmt.Errorf("Failed trying to open extract_yaml path: %s", err)
}
defer writer.Close()
w := tar.NewWriter(writer)
switch format {
case MultiFileExtractYAMLFormat:
for i, y := range yamls {
err = writeYAML(w, fmt.Sprintf("./%s/%02d_%s.yaml", yamlDir, i, y.Name), yamls[i].YAML)
if err != nil {
return err
}
}
case SingleFileExtractYAMLFormat:
// Combine all YAMLs into a single file.
combinedYAML := ""
for _, y := range yamls {
combinedYAML = ConcatYAMLs(combinedYAML, y.YAML)
}
err = writeYAML(w, fmt.Sprintf("./%s/manifest.yaml", yamlDir), combinedYAML)
if err != nil {
return err
}
default:
return errors.New("Invalid extract YAML format")
}
if err = w.Close(); err != nil {
if err != nil {
return errors.New("Failed to write YAMLs")
}
}
return nil
}