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aif-ng
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logging added to config parser.

This commit is contained in:
brent s. 2019-12-19 17:00:16 -05:00
parent b4c9caefbd
commit 4418348e78
1 changed files with 52 additions and 8 deletions
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60
aif/config/parser.py
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@ -20,6 +20,7 @@ class Config(object):
self.xsd = None
self.defaultsParser = None
self.obj = None
_logger.debug('Instantiated {0}.'.format(type(self).__name__))

def main(self, validate = True, populate_defaults = True):
self.fetch()
@ -41,51 +42,68 @@ class Config(object):
raw_xsd = None
base_url = None
if xsdpath:
_logger.debug('XSD path specified.')
orig_xsdpath = xsdpath
xsdpath = os.path.abspath(os.path.expanduser(xsdpath))
_logger.debug('Transformed XSD path: {0} => {1}'.format(orig_xsdpath, xsdpath))
if not os.path.isfile(xsdpath):
raise ValueError(('An explicit XSD path was specified but '
'does not exist on the local filesystem'))
_logger.error('The specified XSD path {0} does not exist on the local filesystem.'.format(xsdpath))
raise ValueError('Specified XSD path does not exist')
with open(xsdpath, 'rb') as fh:
raw_xsd = fh.read()
base_url = os.path.split(xsdpath)[0]
else:
_logger.debug('No XSD path specified; getting it from the configuration file.')
xsi = self.xml.nsmap.get('xsi', 'http://www.w3.org/2001/XMLSchema-instance')
_logger.debug('xsi: {0}'.format(xsi))
schemaLocation = '{{{0}}}schemaLocation'.format(xsi)
schemaURL = self.xml.attrib.get(schemaLocation,
'https://schema.xml.r00t2.io/projects/aif.xsd')
_logger.debug('Detected schema map: {0}'.format(schemaURL))
split_url = schemaURL.split()
if len(split_url) == 2: # a properly defined schemaLocation
schemaURL = split_url[1]
else:
schemaURL = split_url[0] # a LAZY schemaLocation
_logger.info('Detected schema location: {0}'.format(schemaURL))
if schemaURL.startswith('file://'):
schemaURL = re.sub(r'^file://', r'', schemaURL)
_logger.debug('Fetching local file {0}'.format(schemaURL))
with open(schemaURL, 'rb') as fh:
raw_xsd = fh.read()
base_url = os.path.dirname(schemaURL)
else:
_logger.debug('Fetching remote file: {0}'.format(schemaURL))
req = requests.get(schemaURL)
if not req.ok:
# TODO: logging!
_logger.error('Unable to fetch XSD.')
raise RuntimeError('Could not download XSD')
raw_xsd = req.content
base_url = os.path.split(req.url)[0] # This makes me feel dirty.
_logger.debug('Loaded XSD at {0} ({1} bytes).'.format(xsdpath, len(raw_xsd)))
_logger.debug('Parsed XML base URL: {0}'.format(base_url))
self.xsd = etree.XMLSchema(etree.XML(raw_xsd, base_url = base_url))
_logger.info('Rendered XSD.')
return(None)

def parseRaw(self, parser = None):
# self.xml = etree.parse(self.raw, parser = parser)
self.xml = etree.fromstring(self.raw, parser = parser)
# self.namespaced_xml = etree.parse(self.raw, parser = parser)
_logger.debug('Generated xml.')
self.namespaced_xml = etree.fromstring(self.raw, parser = parser)
_logger.debug('Generated namespaced xml.')
self.tree = self.xml.getroottree()
_logger.debug('Generated tree.')
self.namespaced_tree = self.namespaced_xml.getroottree()
_logger.debug('Generated namespaced tree.')
self.tree.xinclude()
_logger.debug('Parsed XInclude for tree.')
self.namespaced_tree.xinclude()
_logger.debug('Parsed XInclude for namespaced tree.')
self.stripNS()
return(None)

def populateDefaults(self):
_logger.info('Populating missing values with defaults from XSD.')
if not self.xsd:
self.getXSD()
if not self.defaultsParser:
@ -95,6 +113,7 @@ class Config(object):

def pythonize(self, stripped = True, obj = 'tree'):
# https://bugs.launchpad.net/lxml/+bug/1850221
_logger.debug('Pythonizing to native objects')
strobj = self.toString(stripped = stripped, obj = obj)
self.obj = objectify.fromstring(strobj)
objectify.annotate(self.obj)
@ -102,38 +121,49 @@ class Config(object):
return(None)

def removeDefaults(self):
_logger.info('Removing default values from missing values.')
self.parseRaw()
return(None)

def stripNS(self, obj = None):
_logger.debug('Stripping namespace.')
# https://stackoverflow.com/questions/30232031/how-can-i-strip-namespaces-out-of-an-lxml-tree/30233635#30233635
xpathq = "descendant-or-self::*[namespace-uri()!='']"
if not obj:
_logger.debug('No XML object selected; using instance\'s xml and tree.')
for x in (self.tree, self.xml):
for e in x.xpath(xpathq):
e.tag = etree.QName(e).localname
elif isinstance(obj, (etree._Element, etree._ElementTree)):
_logger.debug('XML object provided: {0}'.format(etree.tostring(obj)))
obj = copy.deepcopy(obj)
for e in obj.xpath(xpathq):
e.tag = etree.QName(e).localname
return(obj)
else:
_logger.error('A non-XML object was provided.')
raise ValueError('Did not know how to parse obj parameter')
return(None)

def toString(self, stripped = False, obj = None):
if isinstance(obj, (etree._Element, etree._ElementTree)):
_logger.debug('Converting an XML object to a string')
if stripped:
_logger.debug('Stripping before stringifying.')
obj = self.stripNS(obj)
elif obj in ('tree', None):
if not stripped:
_logger.debug('Converting the instance\'s namespaced tree to a string.')
obj = self.namespaced_tree
else:
_logger.debug('Converting the instance\'s stripped tree to a string.')
obj = self.tree
elif obj == 'xml':
if not stripped:
_logger.debug('Converting instance\'s namespaced XML to a string')
obj = self.namespaced_xml
else:
_logger.debug('Converting instance\'s stripped XML to a string')
obj = self.xml
else:
raise ValueError(('obj parameter must be "tree", "xml", or of type '
@ -145,11 +175,13 @@ class Config(object):
pretty_print = True,
with_tail = True,
inclusive_ns_prefixes = True)
_logger.debug('Rendered string output successfully.')
return(strxml)

def validate(self):
if not self.xsd:
self.getXSD()
_logger.debug('Checking validation against namespaced tree.')
self.xsd.assertValid(self.namespaced_tree)
return(None)

@ -161,11 +193,15 @@ class LocalFile(Config):
self.source = path

def fetch(self):
self.source = os.path.realpath(self.source)
orig_src = self.source
self.source = os.path.abspath(os.path.expanduser(self.source))
_logger.debug('Canonized path: {0} => {1}'.format(orig_src, self.source))
if not os.path.isfile(self.source):
raise ValueError('{0} does not exist'.format(self.source))
_logger.error('Config at {0} not found.'.format(self.source))
raise ValueError('Config file does not exist'.format(self.source))
with open(self.source, 'rb') as fh:
self.raw = fh.read()
_logger.debug('Fetched configuration ({0} bytes).'.format(len(self.raw)))
return(None)


@ -178,8 +214,10 @@ class RemoteFile(Config):
def fetch(self):
r = requests.get(self.source)
if not r.ok():
_logger.error('Could not fetch {0}'.format(self.source))
raise RuntimeError('Could not download XML')
self.raw = r.content
_logger.debug('Fetched configuration ({0} bytes).'.format(len(self.raw)))
return(None)


@ -191,6 +229,7 @@ class ConfigStr(Config):

def fetch(self):
self.raw = self.source.encode('utf-8')
_logger.debug('Raw configuration (str) passed in ({0} bytes); converted to bytes.'.format(len(self.raw)))
return(None)


@ -202,6 +241,7 @@ class ConfigBin(Config):

def fetch(self):
self.raw = self.source
_logger.debug('Raw configuration (binary) passed in ({0} bytes); converted to bytes.'.format(len(self.raw)))
return(None)


@ -217,14 +257,18 @@ def getConfig(cfg_ref, validate = True, populate_defaults = True, xsd_path = Non
try:
if pattern.search(cfg_ref):
cfgobj = configClass(cfg_ref, xsd_path = xsd_path)
_logger.info('Config detected as {0}.'.format(configtype))
break
except TypeError:
ptrn = re.compile(detector['raw'][0].pattern.encode('utf-8'))
if not ptrn.search(cfg_ref):
raise ValueError('Received junk data for cfg_ref')
_logger.error('Could not detect which configuration type was passed.')
raise ValueError('Unespected/unparseable cfg_ref.')
else:
_logger.info('Config detected as ConfigBin.')
cfgobj = ConfigBin(cfg_ref, xsd_path = xsd_path)
break
if cfgobj:
_logger.info('Parsing configuration.')
cfgobj.main(validate = validate, populate_defaults = populate_defaults)
return(cfgobj)