57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
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package ui
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import (
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"io"
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"os"
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"opslag.de/schobers/zntg"
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)
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var _ Resources = &CopyResources{}
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// CopyResources copies and opens resources to a temporary directory.
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type CopyResources struct {
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Source Resources
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copy *zntg.Dir
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}
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// NewCopyResource creates a proxy that copied resources first to disk.
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func NewCopyResource(prefix string, source Resources) (*CopyResources, error) {
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copy, err := zntg.NewTempDir(prefix)
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if nil != err {
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return nil, err
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}
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return &CopyResources{source, copy}, nil
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}
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// FetchResource copies the file from the source to disk and returns the path to it.
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func (r *CopyResources) FetchResource(name string) (string, error) {
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path := r.copy.FilePath(name)
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if !zntg.FileExists(path) {
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src, err := r.Source.OpenResource(name)
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if err != nil {
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return "", err
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}
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defer src.Close()
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err = r.copy.Write(name, src)
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if nil != err {
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return "", err
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}
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}
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return path, nil
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}
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// OpenResource opens the (copied) resource on disk.
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func (r *CopyResources) OpenResource(name string) (io.ReadCloser, error) {
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path := r.copy.FilePath(name)
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src, err := os.Open(path)
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return src, err
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}
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// Destroy destroy the copy of the resources.
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func (r *CopyResources) Destroy() error {
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return r.copy.Destroy()
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}
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