Show a pretty progressbar when uploading and downloading an image.

Add a new module that contain generic wrapper for file and iterator, which
are used to wrap image to upload and the request body iterator in upload and
download cases repectively, to show and advance a pretty progress bar when this
laters are consumed, The progress bar is triggered by adding a --progress command
line argument to commands: image-create, image-download or image-update.

Change-Id: I2ba42fd0c58f4fa087adb568ec3f08246cae3759
bug fix: LP#1112309
blueprint: progressbar-when-uploading

glanceclient/v1/shell.py

@@ -25,6 +25,7 @@ else:
 
 from glanceclient import exc
 from glanceclient.common import utils
+from glanceclient.common import progressbar
 from glanceclient.openstack.common import strutils
 import glanceclient.v1.images
 
@@ -165,10 +166,14 @@ def do_image_show(gc, args):
                 'If this is not specified the image data will be '
                 'written to stdout.')
 @utils.arg('image', metavar='<IMAGE>', help='Name or ID of image to download.')
+@utils.arg('--progress', action='store_true', default=False,
+           help='Show download progress bar.')
 def do_image_download(gc, args):
     """Download a specific image."""
     image = utils.find_resource(gc.images, args.image)
     body = image.data()
+    if args.progress:
+        body = progressbar.VerboseIteratorWrapper(body, len(body))
     utils.save_image(body, args.file)
 
 
@@ -219,6 +224,8 @@ def do_image_download(gc, args):
                  "May be used multiple times."))
 @utils.arg('--human-readable', action='store_true', default=False,
            help='Print image size in a human-friendly format.')
+@utils.arg('--progress', action='store_true', default=False,
+           help='Show upload progress bar.')
 def do_image_create(gc, args):
     """Create a new image."""
     # Filter out None values
@@ -241,6 +248,12 @@ def do_image_create(gc, args):
 
     _set_data_field(fields, args)
 
+    if args.progress:
+        filesize = utils.get_file_size(fields['data'])
+        fields['data'] = progressbar.VerboseFileWrapper(
+            fields['data'], filesize
+        )
+
     image = gc.images.create(**fields)
     _image_show(image, args.human_readable)
 
@@ -287,6 +300,8 @@ def do_image_create(gc, args):
                  "those properties not referenced are preserved."))
 @utils.arg('--human-readable', action='store_true', default=False,
            help='Print image size in a human-friendly format.')
+@utils.arg('--progress', action='store_true', default=False,
+           help='Show upload progress bar.')
 def do_image_update(gc, args):
     """Update a specific image."""
     # Filter out None values
@@ -311,6 +326,12 @@ def do_image_update(gc, args):
     if image.status == 'queued':
         _set_data_field(fields, args)
 
+        if args.progress:
+            filesize = utils.get_file_size(fields['data'])
+            fields['data'] = progressbar.VerboseFileWrapper(
+                fields['data'], filesize
+            )
+
     image = gc.images.update(image, purge_props=args.purge_props, **fields)
     _image_show(image, args.human_readable)