Add support '--progress' option for 'image create'

openstack-client doesn’t support the upload progress bar.

This patch shows progressbar when create image
if you added '--progress' option like a python-glanceclient.

like this.
[=============================>] 100%
+------------------+---------------------------+
| Field            | Value                     |
+------------------+---------------------------+
| container_format | bare                      |
| created_at       | 2020-09-06T20:44:40Z      |
...

How to use
Add the'--progress' option on the 'openstack image create' command.

Code was written by referring to 'python-glanceclient' project
on stable/ussuri branch

Change-Id: Ic3035b49da10b6555066eee607a14a5b73797c00
task: 40003
story: 2007777

3 files changed, 156 insertions, 0 deletions

diff --git a/openstackclient/common/progressbar.py b/openstackclient/common/progressbar.py
new file mode 100644
index 00000000..ef767a9c
--- /dev/null
+++ b/openstackclient/common/progressbar.py
@@ -0,0 +1,67 @@
+# Copyright 2013 OpenStack Foundation
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import sys
+
+
+class _ProgressBarBase(object):
+    """A progress bar provider for a wrapped obect.
+
+    Base abstract class used by specific class wrapper to show
+    a progress bar when the wrapped object are consumed.
+
+    :param wrapped: Object to wrap that hold data to be consumed.
+    :param totalsize: The total size of the data in the wrapped object.
+
+    :note: The progress will be displayed only if sys.stdout is a tty.
+    """
+
+    def __init__(self, wrapped, totalsize):
+        self._wrapped = wrapped
+        self._totalsize = float(totalsize)
+        self._show_progress = sys.stdout.isatty() and self._totalsize != 0
+        self._percent = 0
+
+    def _display_progress_bar(self, size_read):
+        if self._show_progress:
+            self._percent += size_read / self._totalsize
+            # Output something like this: [==========>             ] 49%
+            sys.stdout.write('\r[{0:<30}] {1:.0%}'.format(
+                '=' * int(round(self._percent * 29)) + '>', self._percent
+            ))
+            sys.stdout.flush()
+
+    def __getattr__(self, attr):
+        # Forward other attribute access to the wrapped object.
+        return getattr(self._wrapped, attr)
+
+
+class VerboseFileWrapper(_ProgressBarBase):
+    """A file wrapper with a progress bar.
+
+    The file wrapper shows and advances a progress bar whenever the
+    wrapped file's read method is called.
+    """
+
+    def read(self, *args, **kwargs):
+        data = self._wrapped.read(*args, **kwargs)
+        if data:
+            self._display_progress_bar(len(data))
+        else:
+            if self._show_progress:
+                # Break to a new line from the progress bar for incoming
+                # output.
+                sys.stdout.write('\n')
+        return data
diff --git a/openstackclient/image/v2/image.py b/openstackclient/image/v2/image.py
index fa7f4be5..71779293 100644
--- a/openstackclient/image/v2/image.py
+++ b/openstackclient/image/v2/image.py
@@ -30,6 +30,7 @@ from osc_lib.command import command
 from osc_lib import exceptions
 from osc_lib import utils
 
+from openstackclient.common import progressbar
 from openstackclient.common import sdk_utils
 from openstackclient.i18n import _
 from openstackclient.identity import common
@@ -256,6 +257,12 @@ class CreateImage(command.ShowOne):
                    "(only meaningful with --volume)"),
         )
         parser.add_argument(
+            "--progress",
+            action="store_true",
+            default=False,
+            help=_("Show upload progress bar."),
+        )
+        parser.add_argument(
             '--sign-key-path',
             metavar="<sign-key-path>",
             default=[],
@@ -412,6 +419,11 @@ class CreateImage(command.ShowOne):
         if fp is None and parsed_args.file:
             LOG.warning(_("Failed to get an image file."))
             return {}, {}
+        if fp is not None and parsed_args.progress:
+            filesize = os.path.getsize(fname)
+            if filesize is not None:
+                kwargs['validate_checksum'] = False
+                kwargs['data'] = progressbar.VerboseFileWrapper(fp, filesize)
         elif fname:
             kwargs['filename'] = fname
         elif fp:
diff --git a/openstackclient/tests/unit/common/test_progressbar.py b/openstackclient/tests/unit/common/test_progressbar.py
new file mode 100644
index 00000000..7bc0b6ba
--- /dev/null
+++ b/openstackclient/tests/unit/common/test_progressbar.py
@@ -0,0 +1,77 @@
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+#
+
+import sys
+
+import six
+
+from openstackclient.common import progressbar
+from openstackclient.tests.unit import utils
+
+
+class TestProgressBarWrapper(utils.TestCase):
+
+    def test_iter_file_display_progress_bar(self):
+        size = 98304
+        file_obj = six.StringIO('X' * size)
+        saved_stdout = sys.stdout
+        try:
+            sys.stdout = output = FakeTTYStdout()
+            file_obj = progressbar.VerboseFileWrapper(file_obj, size)
+            chunksize = 1024
+            chunk = file_obj.read(chunksize)
+            while chunk:
+                chunk = file_obj.read(chunksize)
+            self.assertEqual(
+                '[%s>] 100%%\n' % ('=' * 29),
+                output.getvalue()
+            )
+        finally:
+            sys.stdout = saved_stdout
+
+    def test_iter_file_no_tty(self):
+        size = 98304
+        file_obj = six.StringIO('X' * size)
+        saved_stdout = sys.stdout
+        try:
+            sys.stdout = output = FakeNoTTYStdout()
+            file_obj = progressbar.VerboseFileWrapper(file_obj, size)
+            chunksize = 1024
+            chunk = file_obj.read(chunksize)
+            while chunk:
+                chunk = file_obj.read(chunksize)
+            # If stdout is not a tty progress bar should do nothing.
+            self.assertEqual('', output.getvalue())
+        finally:
+            sys.stdout = saved_stdout
+
+
+class FakeTTYStdout(six.StringIO):
+    """A Fake stdout that try to emulate a TTY device as much as possible."""
+
+    def isatty(self):
+        return True
+
+    def write(self, data):
+        # When a CR (carriage return) is found reset file.
+        if data.startswith('\r'):
+            self.seek(0)
+            data = data[1:]
+        return six.StringIO.write(self, data)
+
+
+class FakeNoTTYStdout(FakeTTYStdout):
+    """A Fake stdout that is not a TTY device."""
+
+    def isatty(self):
+        return False