Eagerly delete anonymous tempfiles

internal/lsif_transformer/parser/cache.go

@@ -21,6 +21,10 @@ func newCache(tempDir, filename string, data interface{}) (*cache, error) {
 		return nil, err
 	}
 
+	if err := os.Remove(f.Name()); err != nil {
+		return nil, err
+	}
+
 	return &cache{file: f, chunkSize: int64(binary.Size(data))}, nil
 }
 
@@ -41,10 +45,7 @@ func (c *cache) Entry(id Id, data interface{}) error {
 }
 
 func (c *cache) Close() error {
-	return combineErrors(
-		c.file.Close(),
-		os.Remove(c.file.Name()),
-	)
+	return c.file.Close()
 }
 
 func (c *cache) setOffset(id Id) error {

internal/lsif_transformer/parser/hovers.go

@@ -42,6 +42,10 @@ func NewHovers(tempDir string) (*Hovers, error) {
 		return nil, err
 	}
 
+	if err := os.Remove(file.Name()); err != nil {
+		return nil, err
+	}
+
 	offsets, err := newCache(tempDir, "hovers-indexes", Offset{})
 	if err != nil {
 		return nil, err
@@ -91,7 +95,6 @@ func (h *Hovers) For(refId Id) json.RawMessage {
 func (h *Hovers) Close() error {
 	return combineErrors(
 		h.File.Close(),
-		os.Remove(h.File.Name()),
 		h.Offsets.Close(),
 	)
 }

internal/lsif_transformer/parser/parser.go

@@ -68,21 +68,28 @@ func openZipReader(reader io.Reader, tempDir string) (io.Reader, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer os.Remove(tempFile.Name())
 
-	if _, err := io.Copy(tempFile, reader); err != nil {
+	if err := os.Remove(tempFile.Name()); err != nil {
 		return nil, err
 	}
 
-	zr, err := zip.OpenReader(tempFile.Name())
+	size, err := io.Copy(tempFile, reader)
 	if err != nil {
 		return nil, err
 	}
 
-	f := zr.File[0]
-	if f == nil {
-		return nil, errors.New("invalid zip file")
+	if _, err := tempFile.Seek(0, io.SeekStart); err != nil {
+		return nil, err
+	}
+
+	zr, err := zip.NewReader(tempFile, size)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(zr.File) == 0 {
+		return nil, errors.New("empty zip file")
 	}
 
-	return f.Open()
+	return zr.File[0].Open()
 }