def _external_file_download_callback(progress_text, directory, filename, cache, data):
"""
*Private*. Callback function used in :func:`external_file` when a file
is downloaded with :func:`httputils.download_file`.
:param progress_text: The text to display on the progress bar.
:param directory: The directory passed to :func:`external_file`.
:param filename: The filename passed to :func:`external_file`.
:param cache: A dictionary that contains cached information, eventually
from a previous download.
:param data: The data passed from :func:`httputils.download_file`.
"""
is_spinning = data['size'] is None
# Before the download starts but the request is already made, we can
# check if the file already exists.
if data['downloaded'] == 0:
logger.progress_begin(progress_text, is_spinning)
elif data['completed']:
logger.progress_end()
elif is_spinning:
# TODO: Convert bytes to human readable
logger.progress_update(None, data['downloaded'])
elif not is_spinning:
# TODO: Convert bytes to human readable
logger.progress_update(data['downloaded'] / data['size'], data['downloaded'])
def progress(index, count, filename):
if index == -1:
logger.progress_begin("Unpacking {} ...".format(path.basename(archive)))
logger.progress_update(0.0, 'Reading index...')
return
progress = index / float(count)
if index == 0:
logger.progress_end()
logger.progress_begin(None, False)
elif index == (count - 1):
logger.progress_end()
else:
logger.progress_update(progress, '{} / {}'.format(index, count))
def external_file(*urls, filename = None, directory = None,
copy_file_url = False, name = None):
"""
Downloads a file from the first valid URL and saves it into *directory*
under the specified *filename*.
:param urls: One or more URLs. Supports ``http://``, ``https://``,
``ftp://`` and ``file://`. Note that if a ``file://`` URL is
specified, the file is not copied to the output filename unless
*copy_file_url* is True.
:param filename: The output filename of the downloaded file. Defaults
to the filename of the downloaded file.
:param directory: The directory to save the file to. If *filename*
is a relative path, it will be joined with this directory. Defaults
to a path in the build directory.
:param copy_file_url: If True, ``file://`` URLs will be copied instead
of used as-is.
:param name: The name of the loader action. This name is used to store
information in the :attr:`Session.cache` so we can re-use existing
downloaded data. :func:`~craftr.defaults.gtn` will be used to
retrieve the default value for this parameter.
:return: The path to the downloaded file.
"""
name = gtn(name)
if not directory and not filename:
directory = buildlocal('data')
cache = get_loader_cache(name)
# TODO: expand variables of the current module.
target_filename = None
exceptions = []
for url in urls:
if url == cache.get('download_url'):
existing_file = cache.get('download_file')
if existing_file and path.isfile(existing_file):
return existing_file
progress_info = 'Downloading {} ...'.format(url)
if url.startswith('file://'):
source_file = url[7:]
if path.isfile(source_file):
if not copy_file_url:
return source_file
if not filename:
filename = path.basename(source_file)
# TODO: Use httputils.download_file() for this as well?
logger.progress_begin(progress_info)
path.makedirs(directory)
target_filename = path.join(directory, filename)
with open(source_file, 'rb') as sfp:
with open(target_filename, 'wb') as dfp:
for bytes_copied, size in pyutils.copyfileobj(sfp, dfp):
logger.progress_update(float(bytes_copied) / size)
logger.progress_end()
# TODO: Copy file permissions
break
else:
exceptions.append(FileNotFoundError(url))
else:
progress = lambda data: _external_file_download_callback(
progress_info, directory, filename, cache, data)
try:
target_filename, reused = httputils.download_file(
url, filename = filename, directory = directory, on_exists = 'skip',
progress = progress)
except (httputils.URLError, httputils.HTTPError) as exc:
exceptions.append(exc)
else:
break
finally:
logger.progress_end()
if target_filename:
cache['download_url'] = url
cache['download_file'] = target_filename
return target_filename
raise NoExternalFileMatch(name, urls, exceptions)
