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package cfg
import (
"context"
"fmt"
"os"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
)
// DataDir manages the blog's data directory.
type DataDir struct {
Path string
deleteOnClose bool
}
// Init initializes the data directory, creating the directory named at path if
// it doesn't exist.
//
// If Path is not set, then a temporary directory will be created and its path
// set to the Path field. This directory will be removed when Close is called.
func (d *DataDir) Init() error {
if d.Path == "" {
d.deleteOnClose = true
var err error
if d.Path, err = os.MkdirTemp("", "mediocre-blog-data-*"); err != nil {
return fmt.Errorf("creating temporary directory: %w", err)
}
return nil
}
if err := os.MkdirAll(d.Path, 0700); err != nil {
return fmt.Errorf(
"creating directory (and parents) of %q: %w",
d.Path,
err,
)
}
return nil
}
// SetupCfg implement the cfg.Cfger interface.
func (d *DataDir) SetupCfg(cfg *Cfg) {
cfg.StringVar(&d.Path, "data-dir", "", "Directory to use for persistent storage. If unset a temp directory will be created, and will be deleted when the process exits.")
cfg.OnInit(func(ctx context.Context) error {
return d.Init()
})
}
// Annotate implements mctx.Annotator interface.
func (d *DataDir) Annotate(a mctx.Annotations) {
a["dataDirPath"] = d.Path
}
// Close cleans up any temporary state created by DataDir.
func (d *DataDir) Close() error {
if !d.deleteOnClose {
return nil
}
if err := os.RemoveAll(d.Path); err != nil {
return fmt.Errorf("removing temp dir %q: %w", d.Path, err)
}
return nil
}
|
