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output.go
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output.go
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// Copyright 2019 The Kanister 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.
package output
import (
"encoding/json"
"fmt"
"io"
"os"
"regexp"
"github.com/pkg/errors"
)
const (
PhaseOpString = "###Phase-output###:"
)
type Output struct {
Key string `json:"key"`
Value string `json:"value"`
}
func marshalOutput(key, value string) (string, error) {
out := &Output{
Key: key,
Value: value,
}
outString, err := json.Marshal(out)
if err != nil {
return "", errors.Wrap(err, "Failed to marshal key-value pair")
}
return string(outString), nil
}
// UnmarshalOutput unmarshals output json into Output struct
func UnmarshalOutput(opString []byte) (*Output, error) {
p := &Output{}
err := json.Unmarshal([]byte(opString), p)
return p, errors.Wrap(err, "Failed to unmarshal key-value pair")
}
// ValidateKey validates the key argument
func ValidateKey(key string) error {
// key should be non-empty
if key == "" {
return errors.New("Key should not be empty")
}
// key can contain only alpha numeric characters and underscore
valid := regexp.MustCompile("^[a-zA-Z0-9_]*$").MatchString
if !valid(key) {
return errors.New("Key should contain only alphanumeric characters and underscore")
}
return nil
}
// PrintOutput runs the `kando output` command
func PrintOutput(key, value string) error {
return fPrintOutput(os.Stdout, key, value)
}
// PrintOutputTo prints the output of the `kando output` command to w.
func PrintOutputTo(w io.Writer, key, value string) error {
return fPrintOutput(w, key, value)
}
func fPrintOutput(w io.Writer, key, value string) error {
outString, err := marshalOutput(key, value)
if err != nil {
return err
}
fmt.Fprintln(w, PhaseOpString, outString)
return nil
}