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package cluster
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"strings"
fs "github.com/hack-pad/hackpadfs"
)
// OpenFile opens a file on the cluster's config directory with the specified flags
func (m *Cluster) OpenFile(name string, flags int, args ...any) (fs.File, error) {
if len(args) > 0 {
name = fmt.Sprintf(name, args...)
}
return fs.OpenFile(m.dir, name, flags, 0644)
}
// CreateTruncFile creates or truncates a file on the cluster's config directory
func (m *Cluster) CreateTruncFile(name string, args ...any) (io.WriteCloser, error) {
return m.openWriter(name, os.O_CREATE|os.O_TRUNC, args...)
}
// CreateFile creates a file on the cluster's config directory
func (m *Cluster) CreateFile(name string, args ...any) (io.WriteCloser, error) {
return m.openWriter(name, os.O_CREATE, args...)
}
func (m *Cluster) openWriter(name string, flags int, args ...any) (io.WriteCloser, error) {
f, err := m.OpenFile(name, os.O_WRONLY|flags, args...)
if err != nil {
return nil, err
}
if f, ok := f.(io.WriteCloser); ok {
return f, nil
}
panic("unreachable")
}
// RemoveFile deletes a file from the cluster's config directory
func (m *Cluster) RemoveFile(name string, args ...any) error {
if len(args) > 0 {
name = fmt.Sprintf(name, args...)
}
err := fs.Remove(m.dir, name)
switch {
case os.IsNotExist(err):
return nil
default:
return err
}
}
// ReadFile reads a file from the cluster's config directory
func (m *Cluster) ReadFile(name string, args ...any) ([]byte, error) {
if len(args) > 0 {
name = fmt.Sprintf(name, args...)
}
return fs.ReadFile(m.dir, name)
}
// ReadLines reads a file from the cluster's config directory,
// split by lines, trimmed, and accepting `#` to comment lines out.
func (m *Cluster) ReadLines(name string, args ...any) ([]string, error) {
var out []string
data, err := m.ReadFile(name, args...)
if err != nil {
return nil, err
}
sc := bufio.NewScanner(bytes.NewReader(data))
for sc.Scan() {
s := strings.TrimSpace(sc.Text())
switch {
case s == "", strings.HasPrefix(s, "#"):
// ignore
default:
// accepted
out = append(out, s)
}
}
return out, nil
}
// WriteStringFile writes the given content to a file on the machine's config directory
func (m *Cluster) WriteStringFile(value string, name string, args ...any) error {
f, err := m.CreateTruncFile(name, args...)
if err != nil {
return err
}
defer f.Close()
buf := bytes.NewBufferString(value)
_, err = buf.WriteTo(f)
return err
}
// MkdirAll creates directories relative to the cluster's config directory
func (m *Cluster) MkdirAll(name string, args ...any) error {
if len(args) > 0 {
name = fmt.Sprintf(name, args...)
}
return fs.MkdirAll(m.dir, name, 0755)
}