refactor: migrate dlcache to struct

internal/dl/dl.go

@@ -14,7 +14,7 @@
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
+ */
 
 // Пакет dl содержит абстракции для загрузки файлов и каталогов
 // из различных источников.
@@ -39,6 +39,7 @@ import (
 	"golang.org/x/crypto/blake2b"
 	"golang.org/x/crypto/blake2s"
 	"golang.org/x/exp/slices"
+	"plemya-x.ru/alr/internal/config"
 	"plemya-x.ru/alr/internal/dlcache"
 	"plemya-x.ru/alr/pkg/loggerctx"
 )
@@ -142,6 +143,9 @@ type UpdatingDownloader interface {
 // Функция Download загружает файл или каталог с использованием указанных параметров
 func Download(ctx context.Context, opts Options) (err error) {
 	log := loggerctx.From(ctx)
+	cfg := config.GetInstance(ctx)
+	dc := dlcache.New(cfg)
+
 	normalized, err := normalizeURL(opts.URL)
 	if err != nil {
 		return err
@@ -156,7 +160,7 @@ func Download(ctx context.Context, opts Options) (err error) {
 	}
 
 	var t Type
-	cacheDir, ok := dlcache.Get(ctx, opts.URL)
+	cacheDir, ok := dc.Get(ctx, opts.URL)
 	if ok {
 		var updated bool
 		if d, ok := d.(UpdatingDownloader); ok {
@@ -203,7 +207,7 @@ func Download(ctx context.Context, opts Options) (err error) {
 
 	log.Info("Downloading source").Str("source", opts.Name).Str("downloader", d.Name()).Send()
 
-	cacheDir, err = dlcache.New(ctx, opts.URL)
+	cacheDir, err = dc.New(ctx, opts.URL)
 	if err != nil {
 		return err
 	}
@@ -299,8 +303,6 @@ func linkDir(src, dest string) error {
 			return nil
 		}
 
-
-
 		rel, err := filepath.Rel(src, path)
 		if err != nil {
 			return err

internal/dlcache/dlcache.go

@@ -20,29 +20,41 @@ package dlcache
 
 import (
 	"context"
-	"crypto/sha1"
-	"encoding/hex"
-	"io"
 	"os"
 	"path/filepath"
 
 	"plemya-x.ru/alr/internal/config"
 )
 
-// BasePath returns the base path of the download cache
-func BasePath(ctx context.Context) string {
-	return filepath.Join(config.GetPaths(ctx).CacheDir, "dl")
+type Config interface {
+	GetPaths(ctx context.Context) *config.Paths
+}
+
+type DownloadCache struct {
+	cfg Config
+}
+
+func New(cfg Config) *DownloadCache {
+	return &DownloadCache{
+		cfg,
+	}
+}
+
+func (dc *DownloadCache) BasePath(ctx context.Context) string {
+	return filepath.Join(
+		dc.cfg.GetPaths(ctx).CacheDir, "dl",
+	)
 }
 
 // New creates a new directory with the given ID in the cache.
 // If a directory with the same ID already exists,
 // it will be deleted before creating a new one.
-func New(ctx context.Context, id string) (string, error) {
+func (dc *DownloadCache) New(ctx context.Context, id string) (string, error) {
 	h, err := hashID(id)
 	if err != nil {
 		return "", err
 	}
-	itemPath := filepath.Join(BasePath(ctx), h)
+	itemPath := filepath.Join(dc.BasePath(ctx), h)
 
 	fi, err := os.Stat(itemPath)
 	if err == nil || (fi != nil && !fi.IsDir()) {
@@ -65,12 +77,12 @@ func New(ctx context.Context, id string) (string, error) {
 // returns the directory and true. If it
 // does not exist, it returns an empty string
 // and false.
-func Get(ctx context.Context, id string) (string, bool) {
+func (dc *DownloadCache) Get(ctx context.Context, id string) (string, bool) {
 	h, err := hashID(id)
 	if err != nil {
 		return "", false
 	}
-	itemPath := filepath.Join(BasePath(ctx), h)
+	itemPath := filepath.Join(dc.BasePath(ctx), h)
 
 	_, err = os.Stat(itemPath)
 	if err != nil {
@@ -79,15 +91,3 @@ func Get(ctx context.Context, id string) (string, bool) {
 
 	return itemPath, true
 }
-
-// hashID hashes the input ID with SHA1
-// and returns the hex string of the hashed
-// ID.
-func hashID(id string) (string, error) {
-	h := sha1.New()
-	_, err := io.WriteString(h, id)
-	if err != nil {
-		return "", err
-	}
-	return hex.EncodeToString(h.Sum(nil)), nil
-}

internal/dlcache/dlcache_test.go

@@ -39,14 +39,49 @@ func init() {
 	config.GetPaths(context.Background()).RepoDir = dir
 }
 
+type TestALRConfig struct {
+	CacheDir string
+}
+
+func (c *TestALRConfig) GetPaths(ctx context.Context) *config.Paths {
+	return &config.Paths{
+		CacheDir: c.CacheDir,
+	}
+}
+
+func prepare(t *testing.T) *TestALRConfig {
+	t.Helper()
+
+	dir, err := os.MkdirTemp("/tmp", "alr-dlcache-test.*")
+	if err != nil {
+		panic(err)
+	}
+
+	return &TestALRConfig{
+		CacheDir: dir,
+	}
+}
+
+func cleanup(t *testing.T, cfg *TestALRConfig) {
+	t.Helper()
+	os.Remove(cfg.CacheDir)
+}
+
 func TestNew(t *testing.T) {
+	cfg := prepare(t)
+	defer cleanup(t, cfg)
+
+	dc := dlcache.New(cfg)
+
+	ctx := context.Background()
+
 	const id = "https://example.com"
-	dir, err := dlcache.New(id)
+	dir, err := dc.New(ctx, id)
 	if err != nil {
 		t.Errorf("Expected no error, got %s", err)
 	}
 
-	exp := filepath.Join(dlcache.BasePath(), sha1sum(id))
+	exp := filepath.Join(dc.BasePath(ctx), sha1sum(id))
 	if dir != exp {
 		t.Errorf("Expected %s, got %s", exp, dir)
 	}
@@ -60,7 +95,7 @@ func TestNew(t *testing.T) {
 		t.Errorf("Expected cache item to be a directory")
 	}
 
-	dir2, ok := dlcache.Get(id)
+	dir2, ok := dc.Get(ctx, id)
 	if !ok {
 		t.Errorf("Expected Get() to return valid value")
 	}

internal/dlcache/utils.go

@@ -0,0 +1,16 @@
+package dlcache
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"io"
+)
+
+func hashID(id string) (string, error) {
+	h := sha1.New()
+	_, err := io.WriteString(h, id)
+	if err != nil {
+		return "", err
+	}
+	return hex.EncodeToString(h.Sum(nil)), nil
+}