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package app
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"gopkg.in/yaml.v2"
"github.com/google/renameio"
)
const (
// Store the node ID and address.
infoFile = "info.yaml"
// The node store file.
storeFile = "cluster.yaml"
// This is a "flag" file to signal when a brand new node needs to join
// the cluster. In case the node doesn't successfully make it to join
// the cluster first time it's started, it will re-try the next time.
joinFile = "join"
)
// Return true if the given file exists in the given directory.
func fileExists(dir, file string) (bool, error) {
path := filepath.Join(dir, file)
if _, err := os.Stat(path); err != nil {
if !os.IsNotExist(err) {
return false, fmt.Errorf("check if %s exists: %w", file, err)
}
return false, nil
}
return true, nil
}
// Write a file in the given directory.
func fileWrite(dir, file string, data []byte) error {
path := filepath.Join(dir, file)
if err := renameio.WriteFile(path, data, 0600); err != nil {
return fmt.Errorf("write %s: %w", file, err)
}
return nil
}
// Marshal the given object as YAML into the given file.
func fileMarshal(dir, file string, object interface{}) error {
data, err := yaml.Marshal(object)
if err != nil {
return fmt.Errorf("marshall %s: %w", file, err)
}
if err := fileWrite(dir, file, data); err != nil {
return err
}
return nil
}
// Unmarshal the given YAML file into the given object.
func fileUnmarshal(dir, file string, object interface{}) error {
path := filepath.Join(dir, file)
data, err := ioutil.ReadFile(path)
if err != nil {
return fmt.Errorf("read %s: %w", file, err)
}
if err := yaml.Unmarshal(data, object); err != nil {
return fmt.Errorf("unmarshall %s: %w", file, err)
}
return nil
}
// Remove a file in the given directory.
func fileRemove(dir, file string) error {
return os.Remove(filepath.Join(dir, file))
}
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