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New file structure--everything in own file

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* needed for CMS performance (can now save just an item, not whole tree)
* remove split_to_file methods
* simplified AttrMap logic
* write each descriptor to a separate file
* detect format on import and adjust appropriately.
* update tests
This commit is contained in:
Victor Shnayder
2012-08-03 14:51:19 -04:00
committed by Calen Pennington
parent ca177570fa
commit d09e2261f3
5 changed files with 93 additions and 108 deletions
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5
common/lib/xmodule/xmodule/capa_module.py
View File

@@ -572,8 +572,3 @@ class CapaDescriptor(RawDescriptor):
'problems/' + path[8:],
path[8:],
]
@classmethod
def split_to_file(cls, xml_object):
'''Problems always written in their own files'''
return True

8
common/lib/xmodule/xmodule/html_module.py
View File

@@ -109,17 +109,11 @@ class HtmlDescriptor(XmlDescriptor, EditingDescriptor):
# add more info and re-raise
raise Exception(msg), None, sys.exc_info()[2]
@classmethod
def split_to_file(cls, xml_object):
'''Never include inline html'''
return True
# TODO (vshnayder): make export put things in the right places.
def definition_to_xml(self, resource_fs):
'''If the contents are valid xml, write them to filename.xml. Otherwise,
write just the <html filename=""> tag to filename.xml, and the html
write just <html filename="" [meta-attrs="..."]> to filename.xml, and the html
string to filename.html.
'''
try:

13
common/lib/xmodule/xmodule/seq_module.py
View File

@@ -122,16 +122,3 @@ class SequenceDescriptor(MakoModuleDescriptor, XmlDescriptor):
etree.fromstring(child.export_to_xml(resource_fs)))
return xml_object
@classmethod
def split_to_file(cls, xml_object):
# Note: if we end up needing subclasses, can port this logic there.
yes = ('chapter',)
no = ('course',)
if xml_object.tag in yes:
return True
elif xml_object.tag in no:
return False
# otherwise maybe--delegate to superclass.
return XmlDescriptor.split_to_file(xml_object)

9
common/lib/xmodule/xmodule/tests/test_import.py
View File

@@ -134,7 +134,8 @@ class ImportTestCase(unittest.TestCase):
resource_fs = MemoryFS()
exported_xml = descriptor.export_to_xml(resource_fs)
print "Exported xml:", exported_xml
root = etree.fromstring(exported_xml)
chapter_tag = root[0]
self.assertEqual(chapter_tag.tag, 'chapter')
self.assertFalse('graceperiod' in chapter_tag.attrib)
# hardcode path to child
with resource_fs.open('chapter/ch.xml') as f:
chapter_xml = etree.fromstring(f.read())
self.assertEqual(chapter_xml.tag, 'chapter')
self.assertFalse('graceperiod' in chapter_xml.attrib)

166
common/lib/xmodule/xmodule/xml_module.py
View File

@@ -11,22 +11,21 @@ import sys
log = logging.getLogger(__name__)
_AttrMapBase = namedtuple('_AttrMap', 'metadata_key to_metadata from_metadata')
_AttrMapBase = namedtuple('_AttrMap', 'from_xml to_xml')
class AttrMap(_AttrMapBase):
"""
A class that specifies a metadata_key, and two functions:
A class that specifies two functions:
to_metadata: convert value from the xml representation into
from_xml: convert value from the xml representation into
an internal python representation
from_metadata: convert the internal python representation into
to_xml: convert the internal python representation into
the value to store in the xml.
"""
def __new__(_cls, metadata_key,
to_metadata=lambda x: x,
from_metadata=lambda x: x):
return _AttrMapBase.__new__(_cls, metadata_key, to_metadata, from_metadata)
def __new__(_cls, from_xml=lambda x: x,
to_xml=lambda x: x):
return _AttrMapBase.__new__(_cls, from_xml, to_xml)
class XmlDescriptor(XModuleDescriptor):
@@ -39,6 +38,9 @@ class XmlDescriptor(XModuleDescriptor):
# The attributes will be removed from the definition xml passed
# to definition_from_xml, and from the xml returned by definition_to_xml
# Note -- url_name isn't in this list because it's handled specially on
# import and export.
metadata_attributes = ('format', 'graceperiod', 'showanswer', 'rerandomize',
'start', 'due', 'graded', 'display_name', 'url_name', 'hide_from_toc',
'ispublic', # if True, then course is listed for all users; see
@@ -50,8 +52,7 @@ class XmlDescriptor(XModuleDescriptor):
# to import and export them
xml_attribute_map = {
# type conversion: want True/False in python, "true"/"false" in xml
'graded': AttrMap('graded',
lambda val: val == 'true',
'graded': AttrMap(lambda val: val == 'true',
lambda val: str(val).lower()),
}
@@ -101,6 +102,24 @@ class XmlDescriptor(XModuleDescriptor):
"""
return etree.parse(file_object).getroot()
@classmethod
def load_file(cls, filepath, fs, location):
'''
Open the specified file in fs, and call cls.file_to_xml on it,
returning the lxml object.
Add details and reraise on error.
'''
try:
with fs.open(filepath) as file:
return cls.file_to_xml(file)
except Exception as err:
# Add info about where we are, but keep the traceback
msg = 'Unable to load file contents at path %s for item %s: %s ' % (
filepath, location.url(), str(err))
raise Exception, msg, sys.exc_info()[2]
@classmethod
def load_definition(cls, xml_object, system, location):
'''Load a descriptor definition from the specified xml_object.
@@ -128,14 +147,7 @@ class XmlDescriptor(XModuleDescriptor):
filepath = candidate
break
try:
with system.resources_fs.open(filepath) as file:
definition_xml = cls.file_to_xml(file)
except Exception:
msg = 'Unable to load file contents at path %s for item %s' % (
filepath, location.url())
# Add info about where we are, but keep the traceback
raise Exception, msg, sys.exc_info()[2]
definition_xml = cls.load_file(filepath, system.resources_fs, location)
cls.clean_metadata_from_xml(definition_xml)
definition = cls.definition_from_xml(definition_xml, system)
@@ -146,6 +158,24 @@ class XmlDescriptor(XModuleDescriptor):
return definition
@classmethod
def load_metadata(cls, xml_object):
"""
Read the metadata attributes from this xml_object.
Returns a dictionary {key: value}.
"""
metadata = {}
for attr in cls.metadata_attributes:
val = xml_object.get(attr)
if val is not None:
# VS[compat]. Remove after all key translations done
attr = cls._translate(attr)
attr_map = cls.xml_attribute_map.get(attr, AttrMap())
metadata[attr] = attr_map.from_xml(val)
return metadata
@classmethod
def from_xml(cls, xml_data, system, org=None, course=None):
@@ -161,25 +191,20 @@ class XmlDescriptor(XModuleDescriptor):
"""
xml_object = etree.fromstring(xml_data)
# VS[compat] -- just have the url_name lookup once translation is done
slug = xml_object.get('url_name', xml_object.get('slug'))
location = Location('i4x', org, course, xml_object.tag, slug)
url_name = xml_object.get('url_name', xml_object.get('slug'))
location = Location('i4x', org, course, xml_object.tag, url_name)
def load_metadata():
metadata = {}
for attr in cls.metadata_attributes:
val = xml_object.get(attr)
if val is not None:
# VS[compat]. Remove after all key translations done
attr = cls._translate(attr)
# VS[compat] -- detect new-style each-in-a-file mode
if len(xml_object.attrib.keys()) == 1 and len(xml_object) == 0:
# new style: this is just a pointer.
# read the actual defition file--named using url_name
filepath = cls._format_filepath(xml_object.tag, url_name)
definition_xml = cls.load_file(filepath, system.resources_fs, location)
else:
definition_xml = xml_object
attr_map = cls.xml_attribute_map.get(attr, AttrMap(attr))
metadata[attr_map.metadata_key] = attr_map.to_metadata(val)
return metadata
definition = cls.load_definition(xml_object, system, location)
metadata = load_metadata()
# VS[compat] -- just have the url_name lookup once translation is done
slug = xml_object.get('url_name', xml_object.get('slug'))
definition = cls.load_definition(definition_xml, system, location)
metadata = cls.load_metadata(definition_xml)
return cls(
system,
definition,
@@ -193,20 +218,6 @@ class XmlDescriptor(XModuleDescriptor):
name=name,
ext=cls.filename_extension)
@classmethod
def split_to_file(cls, xml_object):
'''
Decide whether to write this object to a separate file or not.
xml_object: an xml definition of an instance of cls.
This default implementation will split if this has more than 7
descendant tags.
Can be overridden by subclasses.
'''
return len(list(xml_object.iter())) > 7
def export_to_xml(self, resource_fs):
"""
Returns an xml string representing this module, and all modules
@@ -227,42 +238,39 @@ class XmlDescriptor(XModuleDescriptor):
xml_object = self.definition_to_xml(resource_fs)
self.__class__.clean_metadata_from_xml(xml_object)
# Set the tag first, so it's right if writing to a file
# Set the tag so we get the file path right
xml_object.tag = self.category
# Write it to a file if necessary
if self.split_to_file(xml_object):
# Put this object in its own file
filepath = self.__class__._format_filepath(self.category, self.url_name)
resource_fs.makedir(os.path.dirname(filepath), allow_recreate=True)
with resource_fs.open(filepath, 'w') as file:
file.write(etree.tostring(xml_object, pretty_print=True))
# ...and remove all of its children here
for child in xml_object:
xml_object.remove(child)
# also need to remove the text of this object.
xml_object.text = ''
# and the tail for good measure...
xml_object.tail = ''
def val_for_xml(attr):
"""Get the value for this attribute that we want to store.
(Possible format conversion through an AttrMap).
"""
attr_map = self.xml_attribute_map.get(attr, AttrMap())
return attr_map.to_xml(self.own_metadata[attr])
xml_object.set('filename', self.url_name)
# Add the metadata
xml_object.set('url_name', self.url_name)
for attr in self.metadata_attributes:
attr_map = self.xml_attribute_map.get(attr, AttrMap(attr))
metadata_key = attr_map.metadata_key
if (metadata_key not in self.metadata or
metadata_key in self._inherited_metadata):
# Add the non-inherited metadata
for attr in self.own_metadata:
if attr not in self.metadata_attributes:
log.warning("Unexpected metadata '{attr}' on element '{url}'."
" Not exporting.".format(attr=attr,
url=self.location.url()))
continue
val = attr_map.from_metadata(self.metadata[metadata_key])
xml_object.set(attr, val)
xml_object.set(attr, val_for_xml(attr))
# Now we just have to make it beautiful
return etree.tostring(xml_object, pretty_print=True)
# Write the actual contents to a file
filepath = self.__class__._format_filepath(self.category, self.url_name)
resource_fs.makedir(os.path.dirname(filepath), allow_recreate=True)
with resource_fs.open(filepath, 'w') as file:
file.write(etree.tostring(xml_object, pretty_print=True))
# And return just a pointer with the category and filename.
record_object = etree.Element(self.category)
record_object.set('url_name', self.url_name)
return etree.tostring(record_object, pretty_print=True)
def definition_to_xml(self, resource_fs):
"""