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