jpictl/pkg/cluster/cluster_file.go

package cluster

import (
	"fmt"
	"io"
	"os"

	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")
}

// 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)
}