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/*
* Copyright 2020 Intel Corporation, Inc
*
* 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 utils
import (
"archive/tar"
"compress/gzip"
"strings"
"io"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
pkgerrors "github.com/pkg/errors"
yaml "gopkg.in/yaml.v3"
)
// ListYamlStruct is applied when the kind is list
type ListYamlStruct struct {
APIVersion string `yaml:"apiVersion,omitempty"`
Kind string `yaml:"kind,omitempty"`
items []YamlStruct `yaml:"items,omitempty"`
}
// YamlStruct represents normal parameters in a manifest file.
// Over the course of time, Pls add more parameters as and when you require.
type YamlStruct struct {
APIVersion string `yaml:"apiVersion,omitempty"`
Kind string `yaml:"kind,omitempty"`
Metadata struct {
Name string `yaml:"name,omitempty"`
Namespace string `yaml:"namespace,omitempty"`
Labels struct {
RouterDeisIoRoutable string `yaml:"router.deis.io/routable,omitempty"`
} `yaml:"labels"`
Annotations struct {
RouterDeisIoDomains string `yaml:"router.deis.io/domains,omitempty"`
} `yaml:"annotations,omitempty"`
} `yaml:"metadata,omitempty"`
Spec struct {
Type string `yaml:"type,omitempty"`
Selector struct {
App string `yaml:"app,omitempty"`
} `yaml:"selector,omitempty"`
Ports []struct {
Name string `yaml:"name,omitempty"`
Port int `yaml:"port,omitempty"`
NodePort int `yaml:"nodePort,omitempty"`
} `yaml:"ports"`
} `yaml:"spec"`
}
func (y YamlStruct) isValid() bool {
if y.APIVersion == "" {
log.Printf("apiVersion is missing in manifest file")
return false
}
if y.Kind == "" {
log.Printf("kind is missing in manifest file")
return false
}
if y.Metadata.Name == "" {
log.Printf("metadata.name is missing in manifest file")
return false
}
return true
}
// ExtractYamlParameters is a method which takes in the abolute path of a manifest file
// and returns a struct accordingly
func ExtractYamlParameters(f string) (YamlStruct, error) {
filename, _ := filepath.Abs(f)
yamlFile, err := ioutil.ReadFile(filename)
var yamlStruct YamlStruct
err = yaml.Unmarshal(yamlFile, &yamlStruct)
if err != nil {
return YamlStruct{}, pkgerrors.New("Cant unmarshal yaml file ..")
}
/* This is a special case handling when the kind is "List".
When the kind is list and the metadata name is empty.
We set the metadata name as the file name. For eg:
if filename is "/tmp/helm-tmpl-240995533/prometheus/templates/serviceaccount.yaml-0".
We set metadata name as "serviceaccount.yaml-0"
Usually when the kind is list, the list might contains a list of
*/
if yamlStruct.Kind == "List" && yamlStruct.Metadata.Name == "" {
li := strings.LastIndex(filename, "/")
fn := string(filename[li+1:])
yamlStruct.Metadata.Name = fn
log.Printf("Setting the metadata name as :: %s", fn)
}
if yamlStruct.isValid() {
log.Printf("YAML parameters for file ::%s \n %v", f, yamlStruct)
return yamlStruct, nil
}
log.Printf("YAML file ::%s has errors", f)
return YamlStruct{}, pkgerrors.Errorf("Cant extract parameters from yaml file :: %s", filename)
}
//ExtractTarBall provides functionality to extract a tar.gz file
//into a temporary location for later use.
//It returns the path to the new location
func ExtractTarBall(r io.Reader) (string, error) {
//Check if it is a valid gz
gzf, err := gzip.NewReader(r)
if err != nil {
return "", pkgerrors.Wrap(err, "Invalid gzip format")
}
//Check if it is a valid tar file
//Unfortunately this can only be done by inspecting all the tar contents
tarR := tar.NewReader(gzf)
first := true
outDir, _ := ioutil.TempDir("", "k8s-ext-")
for true {
header, err := tarR.Next()
if err == io.EOF {
//Check if we have just a gzip file without a tar archive inside
if first {
return "", pkgerrors.New("Empty or non-existant Tar file found")
}
//End of archive
break
}
if err != nil {
return "", pkgerrors.Wrap(err, "Error reading tar file")
}
target := filepath.Join(outDir, header.Name)
switch header.Typeflag {
case tar.TypeDir:
if _, err := os.Stat(target); err != nil {
// Using 755 read, write, execute for owner
// groups and others get read and execute permissions
// on the folder.
if err := os.MkdirAll(target, 0755); err != nil {
return "", pkgerrors.Wrap(err, "Creating directory")
}
}
case tar.TypeReg:
if target == outDir { // Handle '.' substituted to '' entry
continue
}
err = EnsureDirectory(target)
if err != nil {
return "", pkgerrors.Wrap(err, "Creating Directory")
}
f, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode))
if err != nil {
return "", pkgerrors.Wrap(err, "Creating file")
}
// copy over contents
if _, err := io.Copy(f, tarR); err != nil {
return "", pkgerrors.Wrap(err, "Copying file content")
}
// close for each file instead of a defer for all
// at the end of the function
f.Close()
}
first = false
}
return outDir, nil
}
//EnsureDirectory makes sure that the directories specified in the path exist
//If not, it will create them, if possible.
func EnsureDirectory(f string) error {
base := path.Dir(f)
_, err := os.Stat(base)
if err != nil && !os.IsNotExist(err) {
return err
}
return os.MkdirAll(base, 0755)
}
// func main() {
// filename := "./test.yaml"
// yamlStruct, err := ExtractYamlParameters(filename)
// if err!=nil {
// log.Print(err)
// }
// fmt.Printf("%s+%s", yamlStruct.Metadata.Name, yamlStruct.Kind)
// fmt.Printf("%v", yamlStruct)
// }
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