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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// File utilities.
// Author: bratseth
package util
import (
"bytes"
"encoding/json"
"errors"
"io"
"os"
"path/filepath"
"strings"
)
// Returns true if the given path exists
func PathExists(path string) bool {
info, err := os.Stat(path)
return !errors.Is(err, os.ErrNotExist) && info != nil
}
// Returns true if the given path points to an existing directory
func IsDirectory(path string) bool {
info, err := os.Stat(path)
return !errors.Is(err, os.ErrNotExist) && info != nil && info.IsDir()
}
// Returns true if the given path points to an existing file
func IsRegularFile(path string) bool {
info, err := os.Stat(path)
return !errors.Is(err, os.ErrNotExist) && info != nil && info.Mode().IsRegular()
}
// Returns true if the given path points to an executable
func IsExecutableFile(path string) bool {
info, err := os.Stat(path)
return !errors.Is(err, os.ErrNotExist) &&
info != nil &&
info.Mode().IsRegular() &&
((int(info.Mode()) & 0111) == 0111)
}
// Returns the content of a reader as a string
func ReaderToString(reader io.Reader) string {
var buffer strings.Builder
io.Copy(&buffer, reader)
return buffer.String()
}
// Returns the content of a reader as a byte array
func ReaderToBytes(reader io.Reader) []byte {
var buffer bytes.Buffer
buffer.ReadFrom(reader)
return buffer.Bytes()
}
// Returns the contents of reader as indented JSON
func ReaderToJSON(reader io.Reader) string {
bodyBytes, _ := io.ReadAll(reader)
var prettyJSON bytes.Buffer
parseError := json.Indent(&prettyJSON, bodyBytes, "", " ")
if parseError != nil { // Not JSON: Print plainly
return string(bodyBytes)
}
return prettyJSON.String()
}
// AtomicWriteFile atomically writes data to filename.
func AtomicWriteFile(filename string, data []byte) error {
dir := filepath.Dir(filename)
tmpFile, err := os.CreateTemp(dir, "vespa")
if err != nil {
return err
}
defer os.Remove(tmpFile.Name())
if _, err := tmpFile.Write(data); err != nil {
return err
}
if err := tmpFile.Close(); err != nil {
return err
}
return os.Rename(tmpFile.Name(), filename)
}
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