Vendor dependencies with dep

vendor/github.com/ncw/swift/dlo.go

@@ -0,0 +1,136 @@
+package swift
+
+import (
+	"os"
+)
+
+// DynamicLargeObjectCreateFile represents an open static large object
+type DynamicLargeObjectCreateFile struct {
+	largeObjectCreateFile
+}
+
+// DynamicLargeObjectCreateFile creates a dynamic large object
+// returning an object which satisfies io.Writer, io.Seeker, io.Closer
+// and io.ReaderFrom.  The flags are as passes to the
+// largeObjectCreate method.
+func (c *Connection) DynamicLargeObjectCreateFile(opts *LargeObjectOpts) (LargeObjectFile, error) {
+	lo, err := c.largeObjectCreate(opts)
+	if err != nil {
+		return nil, err
+	}
+
+	return withBuffer(opts, &DynamicLargeObjectCreateFile{
+		largeObjectCreateFile: *lo,
+	}), nil
+}
+
+// DynamicLargeObjectCreate creates or truncates an existing dynamic
+// large object returning a writeable object.  This sets opts.Flags to
+// an appropriate value before calling DynamicLargeObjectCreateFile
+func (c *Connection) DynamicLargeObjectCreate(opts *LargeObjectOpts) (LargeObjectFile, error) {
+	opts.Flags = os.O_TRUNC | os.O_CREATE
+	return c.DynamicLargeObjectCreateFile(opts)
+}
+
+// DynamicLargeObjectDelete deletes a dynamic large object and all of its segments.
+func (c *Connection) DynamicLargeObjectDelete(container string, path string) error {
+	return c.LargeObjectDelete(container, path)
+}
+
+// DynamicLargeObjectMove moves a dynamic large object from srcContainer, srcObjectName to dstContainer, dstObjectName
+func (c *Connection) DynamicLargeObjectMove(srcContainer string, srcObjectName string, dstContainer string, dstObjectName string) error {
+	info, headers, err := c.Object(dstContainer, srcObjectName)
+	if err != nil {
+		return err
+	}
+
+	segmentContainer, segmentPath := parseFullPath(headers["X-Object-Manifest"])
+	if err := c.createDLOManifest(dstContainer, dstObjectName, segmentContainer+"/"+segmentPath, info.ContentType); err != nil {
+		return err
+	}
+
+	if err := c.ObjectDelete(srcContainer, srcObjectName); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// createDLOManifest creates a dynamic large object manifest
+func (c *Connection) createDLOManifest(container string, objectName string, prefix string, contentType string) error {
+	headers := make(Headers)
+	headers["X-Object-Manifest"] = prefix
+	manifest, err := c.ObjectCreate(container, objectName, false, "", contentType, headers)
+	if err != nil {
+		return err
+	}
+
+	if err := manifest.Close(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Close satisfies the io.Closer interface
+func (file *DynamicLargeObjectCreateFile) Close() error {
+	return file.Flush()
+}
+
+func (file *DynamicLargeObjectCreateFile) Flush() error {
+	err := file.conn.createDLOManifest(file.container, file.objectName, file.segmentContainer+"/"+file.prefix, file.contentType)
+	if err != nil {
+		return err
+	}
+	return file.conn.waitForSegmentsToShowUp(file.container, file.objectName, file.Size())
+}
+
+func (c *Connection) getAllDLOSegments(segmentContainer, segmentPath string) ([]Object, error) {
+	//a simple container listing works 99.9% of the time
+	segments, err := c.ObjectsAll(segmentContainer, &ObjectsOpts{Prefix: segmentPath})
+	if err != nil {
+		return nil, err
+	}
+
+	hasObjectName := make(map[string]struct{})
+	for _, segment := range segments {
+		hasObjectName[segment.Name] = struct{}{}
+	}
+
+	//The container listing might be outdated (i.e. not contain all existing
+	//segment objects yet) because of temporary inconsistency (Swift is only
+	//eventually consistent!). Check its completeness.
+	segmentNumber := 0
+	for {
+		segmentNumber++
+		segmentName := getSegment(segmentPath, segmentNumber)
+		if _, seen := hasObjectName[segmentName]; seen {
+			continue
+		}
+
+		//This segment is missing in the container listing. Use a more reliable
+		//request to check its existence. (HEAD requests on segments are
+		//guaranteed to return the correct metadata, except for the pathological
+		//case of an outage of large parts of the Swift cluster or its network,
+		//since every segment is only written once.)
+		segment, _, err := c.Object(segmentContainer, segmentName)
+		switch err {
+		case nil:
+			//found new segment -> add it in the correct position and keep
+			//going, more might be missing
+			if segmentNumber <= len(segments) {
+				segments = append(segments[:segmentNumber], segments[segmentNumber-1:]...)
+				segments[segmentNumber-1] = segment
+			} else {
+				segments = append(segments, segment)
+			}
+			continue
+		case ObjectNotFound:
+			//This segment is missing. Since we upload segments sequentially,
+			//there won't be any more segments after it.
+			return segments, nil
+		default:
+			return nil, err //unexpected error
+		}
+	}
+}