fix pull 0 bytes on completed layer

server/images.go

@@ -445,13 +445,14 @@ func CreateLayer(f io.ReadSeeker) (*LayerReader, error) {
 	return layer, nil
 }
 
-func PushModel(name, username, password string, fn func(status, digest string, Total, Completed int, Percent float64)) error {
+func PushModel(name, username, password string, fn func(api.ProgressResponse)) error {
 	mp := ParseModelPath(name)
 
-	fn("retrieving manifest", "", 0, 0, 0)
+	fn(api.ProgressResponse{Status: "retrieving manifest"})
+
 	manifest, err := GetManifest(mp)
 	if err != nil {
-		fn("couldn't retrieve manifest", "", 0, 0, 0)
+		fn(api.ProgressResponse{Status: "couldn't retrieve manifest"})
 		return err
 	}
 
@@ -473,11 +474,21 @@ func PushModel(name, username, password string, fn func(status, digest string, T
 
 		if exists {
 			completed += layer.Size
-			fn("using existing layer", layer.Digest, total, completed, float64(completed)/float64(total))
+			fn(api.ProgressResponse{
+				Status:    "using existing layer",
+				Digest:    layer.Digest,
+				Total:     total,
+				Completed: completed,
+			})
 			continue
 		}
 
-		fn("starting upload", layer.Digest, total, completed, float64(completed)/float64(total))
+		fn(api.ProgressResponse{
+			Status:    "starting upload",
+			Digest:    layer.Digest,
+			Total:     total,
+			Completed: completed,
+		})
 
 		location, err := startUpload(mp, username, password)
 		if err != nil {
@@ -491,10 +502,19 @@ func PushModel(name, username, password string, fn func(status, digest string, T
 			return err
 		}
 		completed += layer.Size
-		fn("upload complete", layer.Digest, total, completed, float64(completed)/float64(total))
+		fn(api.ProgressResponse{
+			Status:    "upload complete",
+			Digest:    layer.Digest,
+			Total:     total,
+			Completed: completed,
+		})
 	}
 
-	fn("pushing manifest", "", total, completed, float64(completed/total))
+	fn(api.ProgressResponse{
+		Status:    "pushing manifest",
+		Total:     total,
+		Completed: completed,
+	})
 	url := fmt.Sprintf("%s://%s/v2/%s/manifests/%s", mp.ProtocolScheme, mp.Registry, mp.GetNamespaceRepository(), mp.Tag)
 	headers := map[string]string{
 		"Content-Type": "application/vnd.docker.distribution.manifest.v2+json",
@@ -517,15 +537,19 @@ func PushModel(name, username, password string, fn func(status, digest string, T
 		return fmt.Errorf("registry responded with code %d: %v", resp.StatusCode, string(body))
 	}
 
-	fn("success", "", total, completed, 1.0)
+	fn(api.ProgressResponse{
+		Status:    "success",
+		Total:     total,
+		Completed: completed,
+	})
 
 	return nil
 }
 
-func PullModel(name, username, password string, fn func(status, digest string, Total, Completed int, Percent float64)) error {
+func PullModel(name, username, password string, fn func(api.ProgressResponse)) error {
 	mp := ParseModelPath(name)
 
-	fn("pulling manifest", "", 0, 0, 0)
+	fn(api.ProgressResponse{Status: "pulling manifest"})
 
 	manifest, err := pullModelManifest(mp, username, password)
 	if err != nil {
@@ -543,16 +567,15 @@ func PullModel(name, username, password string, fn func(status, digest string, T
 	total += manifest.Config.Size
 
 	for _, layer := range layers {
-		fn("starting download", layer.Digest, total, completed, float64(completed)/float64(total))
 		if err := downloadBlob(mp, layer.Digest, username, password, fn); err != nil {
-			fn(fmt.Sprintf("error downloading: %v", err), layer.Digest, 0, 0, 0)
+			fn(api.ProgressResponse{Status: fmt.Sprintf("error downloading: %v", err), Digest: layer.Digest})
 			return err
 		}
+
 		completed += layer.Size
-		fn("download complete", layer.Digest, total, completed, float64(completed)/float64(total))
 	}
 
-	fn("writing manifest", "", total, completed, 1.0)
+	fn(api.ProgressResponse{Status: "writing manifest"})
 
 	manifestJSON, err := json.Marshal(manifest)
 	if err != nil {
@@ -570,7 +593,7 @@ func PullModel(name, username, password string, fn func(status, digest string, T
 		return err
 	}
 
-	fn("success", "", total, completed, 1.0)
+	fn(api.ProgressResponse{Status: "success"})
 
 	return nil
 }
@@ -722,16 +745,20 @@ func uploadBlob(location string, layer *Layer, username string, password string)
 	return nil
 }
 
-func downloadBlob(mp ModelPath, digest string, username, password string, fn func(status, digest string, Total, Completed int, Percent float64)) error {
+func downloadBlob(mp ModelPath, digest string, username, password string, fn func(api.ProgressResponse)) error {
 	fp, err := GetBlobsPath(digest)
 	if err != nil {
 		return err
 	}
 
-	_, err = os.Stat(fp)
-	if !os.IsNotExist(err) {
+	if fi, _ := os.Stat(fp); fi != nil {
 		// we already have the file, so return
-		log.Printf("already have %s\n", digest)
+		fn(api.ProgressResponse{
+			Digest:    digest,
+			Total:     int(fi.Size()),
+			Completed: int(fi.Size()),
+		})
+
 		return nil
 	}
 
@@ -780,10 +807,21 @@ func downloadBlob(mp ModelPath, digest string, username, password string, fn fun
 	total := remaining + completed
 
 	for {
-		fn(fmt.Sprintf("Downloading %s", digest), digest, int(total), int(completed), float64(completed)/float64(total))
+		fn(api.ProgressResponse{
+			Status:    fmt.Sprintf("downloading %s", digest),
+			Digest:    digest,
+			Total:     int(total),
+			Completed: int(completed),
+		})
+
 		if completed >= total {
 			if err := os.Rename(fp+"-partial", fp); err != nil {
-				fn(fmt.Sprintf("error renaming file: %v", err), digest, int(total), int(completed), 1)
+				fn(api.ProgressResponse{
+					Status:    fmt.Sprintf("error renaming file: %v", err),
+					Digest:    digest,
+					Total:     int(total),
+					Completed: int(completed),
+				})
 				return err
 			}