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visitor.go
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visitor.go
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/*
* Copyright (c) 2017, MegaEase
* 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: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 command
import (
"bufio"
"fmt"
"io"
"os"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/util/yaml"
)
// YAMLVisitor walk through multiple YAML documents
type YAMLVisitor interface {
Visit(func(yamlDoc []byte) error) error
Close()
}
type yamlVisitor struct {
reader io.Reader
}
// Visit implements YAMLVisitor
func (v *yamlVisitor) Visit(fn func(yamlDoc []byte) error) error {
r := yaml.NewYAMLReader(bufio.NewReader(v.reader))
for {
data, err := r.Read()
if len(data) == 0 {
if err == io.EOF {
return nil
}
if err != nil {
return err
}
continue
}
if err = fn(data); err != nil {
return err
}
}
}
// Close closes the yamlVisitor
func (v *yamlVisitor) Close() {
if closer, ok := v.reader.(io.Closer); ok {
closer.Close()
}
}
type spec struct {
Kind string
Name string
doc string
}
// SpecVisitor walk through multiple specs
type SpecVisitor interface {
Visit(func(*spec) error) error
Close()
}
type specVisitor struct {
v YAMLVisitor
}
// Visit implements SpecVisitor
func (v *specVisitor) Visit(fn func(*spec) error) error {
var specs []spec
err := v.v.Visit(func(yamlDoc []byte) error {
s := spec{}
doc := string(yamlDoc)
err := yaml.Unmarshal(yamlDoc, &s)
if err != nil {
return fmt.Errorf("error parsing %s: %v", doc, err)
}
if s.Name == "" {
return fmt.Errorf("name is empty: %s", doc)
}
if s.Kind == "" {
return fmt.Errorf("kind is empty: %s", doc)
}
s.doc = doc
specs = append(specs, s)
return nil
})
if err != nil {
ExitWithError(err)
}
for _, s := range specs {
fn(&s)
}
return nil
}
// Close closes the specVisitor
func (v *specVisitor) Close() {
v.v.Close()
}
func buildYAMLVisitor(yamlFile string, cmd *cobra.Command) YAMLVisitor {
var r io.ReadCloser
if yamlFile == "" {
r = io.NopCloser(os.Stdin)
} else if f, err := os.Open(yamlFile); err != nil {
ExitWithErrorf("%s failed: %v", cmd.Short, err)
} else {
r = f
}
return &yamlVisitor{reader: r}
}
func buildSpecVisitor(yamlFile string, cmd *cobra.Command) SpecVisitor {
v := buildYAMLVisitor(yamlFile, cmd)
return &specVisitor{v: v}
}