def get_extension(environ):
'''Extract the data format extension from request parameters and check that they are supported'''
req = Request(environ)
form = req.params
if form.has_key('data-format') and form['data-format'] in load_responses().keys():
return form['data-format']
else:
return None
def setUp(self):
"""Load all available responses.
At least the DDS, DAS, DODS, HTML, ASC and version responses should be
loaded, since they are included in Pydap. Other third-party responses
may also be present.
"""
self.responses = load_responses()
def setUp(self):
"""Load all available responses.
At least the DDS, DAS, DODS, HTML, ASC and version responses should be
loaded, since they are included in pydap. Other third-party responses
may also be present.
"""
self.responses = load_responses()
class BaseHandler(object):
"""
Base class for Pydap handlers.
Handlers are WSGI applications that parse the client request and build the
corresponding dataset. The dataset is passed to proper Response (DDS, DAS,
etc.)
"""
# load all available responses
responses = load_responses()
def __init__(self, dataset=None):
self.dataset = dataset
self.additional_headers = []
def __call__(self, environ, start_response):
req = Request(environ)
path, response = req.path.rsplit('.', 1)
if response == 'das':
req.query_string = ''
projection, selection = parse_ce(req.query_string)
try:
# build the dataset and pass it to the proper response, returning a
# WSGI app
dataset = self.parse(projection, selection)
app = self.responses[response](dataset)
app.close = self.close
# now build a Response and set additional headers
res = req.get_response(app)
for key, value in self.additional_headers:
res.headers.add(key, value)
return res(environ, start_response)
except HTTPException, exc:
# HTTP exceptions are used to redirect the user
return exc(environ, start_response)
except:
class BaseHandler(object):
"""Base class for Pydap handlers.
Handlers are WSGI applications that parse the client request and build the
corresponding dataset. The dataset is passed to proper Response (DDS, DAS,
etc.)
"""
# load all available responses
responses = load_responses()
def __init__(self, dataset=None):
self.dataset = dataset
self.additional_headers = []
def __call__(self, environ, start_response):
req = Request(environ)
path, response = req.path.rsplit('.', 1)
if response == 'das':
req.query_string = ''
projection, selection = parse_ce(req.query_string)
buffer_size = environ.get('pydap.buffer_size', BUFFER_SIZE)
try:
# build the dataset and pass it to the proper response, returning a
# WSGI app
dataset = self.parse(projection, selection, buffer_size)
app = self.responses[response](dataset)
app.close = self.close
# now build a Response and set additional headers
res = req.get_response(app)
for key, value in self.additional_headers:
res.headers.add(key, value)
# CORS for Javascript requests
if response in CORS_RESPONSES:
res.headers.add('Access-Control-Allow-Origin', '*')
res.headers.add('Access-Control-Allow-Headers',
'Origin, X-Requested-With, Content-Type')
return res(environ, start_response)
except:
# should the exception be catched?
if environ.get('x-wsgiorg.throw_errors'):
raise
else:
res = ErrorResponse(info=sys.exc_info())
return res(environ, start_response)
def parse(self, projection, selection, buffer_size=BUFFER_SIZE):
"""Parse the constraint expression, returning a new dataset."""
if self.dataset is None:
raise NotImplementedError(
"Subclasses must define a ``dataset`` attribute pointing to a"
"``DatasetType`` object.")
# make a copy of the dataset, so we can filter sequences inplace
dataset = copy.copy(self.dataset)
# apply the selection to the dataset, inplace
apply_selection(selection, dataset)
# wrap data in Arrayterator, to optimize projection/selection
dataset = wrap_arrayterator(dataset, buffer_size)
# fix projection
if projection:
projection = fix_shorthand(projection, dataset)
else:
projection = [[(key, ())] for key in dataset.keys()]
dataset = apply_projection(projection, dataset)
return dataset
def close(self):
"""Optional method for closing the dataset."""
pass