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Various cleanups

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This commit is contained in:
Tom Christie 2011-01-12 12:34:57 +00:00
parent 42825e44e1
commit 5557dfb54c
3 changed files with 93 additions and 82 deletions
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35
src/rest/emitters.py
View File

@ -4,12 +4,8 @@ import json
from utils import dict2xml from utils import dict2xml
class BaseEmitter(object): class BaseEmitter(object):
def __init__(self, resource, request, status, headers, form): def __init__(self, resource):
self.request = request
self.resource = resource self.resource = resource
self.status = status
self.headers = headers
self.form = form
def emit(self, output): def emit(self, output):
return output return output
@ -18,28 +14,43 @@ class TemplatedEmitter(BaseEmitter):
template = None template = None
def emit(self, output): def emit(self, output):
if output is None:
content = ''
else:
content = json.dumps(output, indent=4, sort_keys=True) content = json.dumps(output, indent=4, sort_keys=True)
template = loader.get_template(self.template) template = loader.get_template(self.template)
context = RequestContext(self.request, { context = RequestContext(self.resource.request, {
'content': content, 'content': content,
'status': self.status, 'status': self.resource.resp_status,
'reason': STATUS_CODE_TEXT.get(self.status, ''), 'reason': STATUS_CODE_TEXT.get(self.resource.resp_status, ''),
'headers': self.headers, 'headers': self.resource.resp_headers,
'resource_name': self.resource.__class__.__name__, 'resource_name': self.resource.__class__.__name__,
'resource_doc': self.resource.__doc__, 'resource_doc': self.resource.__doc__,
'create_form': self.form, 'create_form': self.resource.form,
'update_form': self.form, 'update_form': self.resource.form,
'request': self.request, 'request': self.resource.request,
'resource': self.resource, 'resource': self.resource,
}) })
# Munge DELETE Response code to allow us to return content
if self.resource.resp_status == 204:
self.resource.resp_status = 200
return template.render(context) return template.render(context)
class JSONEmitter(BaseEmitter): class JSONEmitter(BaseEmitter):
def emit(self, output): def emit(self, output):
if output is None:
# Treat None as no message body, rather than serializing
return ''
return json.dumps(output) return json.dumps(output)
class XMLEmitter(BaseEmitter): class XMLEmitter(BaseEmitter):
def emit(self, output): def emit(self, output):
if output is None:
# Treat None as no message body, rather than serializing
return ''
return dict2xml(output) return dict2xml(output)
class HTMLEmitter(TemplatedEmitter): class HTMLEmitter(TemplatedEmitter):

23
src/rest/parsers.py
View File

@ -1,9 +1,8 @@
import json import json
class BaseParser(object): class BaseParser(object):
def __init__(self, resource, request): def __init__(self, resource):
self.resource = resource self.resource = resource
self.request = request
def parse(self, input): def parse(self, input):
return {} return {}
@ -20,9 +19,9 @@ class FormParser(BaseParser):
"""The default parser for form data. """The default parser for form data.
Return a dict containing a single value for each non-reserved parameter Return a dict containing a single value for each non-reserved parameter
""" """
def __init__(self, resource, request): def __init__(self, resource):
if request.method == 'PUT': if resource.request.method == 'PUT':
# Fix from piston to force Django to give PUT requests the same # Fix from piston to force Django to give PUT requests the same
# form processing that POST requests get... # form processing that POST requests get...
# #
@ -36,22 +35,22 @@ class FormParser(BaseParser):
# the first time _load_post_and_files is called (both by wsgi.py and # the first time _load_post_and_files is called (both by wsgi.py and
# modpython.py). If it's set, the request has to be 'reset' to redo # modpython.py). If it's set, the request has to be 'reset' to redo
# the query value parsing in POST mode. # the query value parsing in POST mode.
if hasattr(request, '_post'): if hasattr(resource.request, '_post'):
del request._post del request._post
del request._files del request._files
try: try:
request.method = "POST" resource.request.method = "POST"
request._load_post_and_files() resource.request._load_post_and_files()
request.method = "PUT" resource.request.method = "PUT"
except AttributeError: except AttributeError:
request.META['REQUEST_METHOD'] = 'POST' resource.request.META['REQUEST_METHOD'] = 'POST'
request._load_post_and_files() resource.request._load_post_and_files()
request.META['REQUEST_METHOD'] = 'PUT' resource.request.META['REQUEST_METHOD'] = 'PUT'
# #
self.data = {} self.data = {}
for (key, val) in request.POST.items(): for (key, val) in resource.request.POST.items():
if key not in resource.RESERVED_PARAMS: if key not in resource.RESERVED_PARAMS:
self.data[key] = val self.data[key] = val

109
src/rest/resource.py
View File

@ -57,7 +57,7 @@ class Resource(object):
"""Make the class callable so it can be used as a Django view.""" """Make the class callable so it can be used as a Django view."""
self = object.__new__(cls) self = object.__new__(cls)
self.__init__() self.__init__()
self._request = request self.request = request
try: try:
return self._handle_request(request, *args, **kwargs) return self._handle_request(request, *args, **kwargs)
except: except:
@ -76,7 +76,7 @@ class Resource(object):
TODO: Add SITEMAP option. TODO: Add SITEMAP option.
Provided for convienience.""" Provided for convienience."""
return self._request.build_absolute_uri(reverse(view, *args, **kwargs)) return self.request.build_absolute_uri(reverse(view, *args, **kwargs))
def make_absolute(self, uri): def make_absolute(self, uri):
@ -84,7 +84,7 @@ class Resource(object):
TODO: Add SITEMAP option. TODO: Add SITEMAP option.
Provided for convienience.""" Provided for convienience."""
return self._request.build_absolute_uri(uri) return self.request.build_absolute_uri(uri)
def read(self, headers={}, *args, **kwargs): def read(self, headers={}, *args, **kwargs):
@ -137,36 +137,41 @@ class Resource(object):
def determine_form(self, input_data=None, return_data=None): def determine_form(self, data=None, is_response=False):
"""Optionally return a Django Form instance, which may be used for validation """Optionally return a Django Form instance, which may be used for validation
and/or rendered by an HTML/XHTML emitter. and/or rendered by an HTML/XHTML emitter.
The input_data or return_data arguments can be used to bind the form either to the deserialized input, If data is not None the form will be bound to data. is_response indicates if data should be
or to a return object. treated as the input data (bind to client input) or the response data (bind to an existing object).
""" """
if self.form: if self.form:
if input_data: if data:
return self.form(input_data) return self.form(data)
elif return_data:
return self.form(return_data)
else: else:
return self.form() return self.form()
return None return None
def cleanup_request(self, data, form=None): def cleanup_request(self, data):
"""Perform any resource-specific data deserialization and/or validation """Perform any resource-specific data deserialization and/or validation
after the initial HTTP content-type deserialization has taken place. after the initial HTTP content-type deserialization has taken place.
Optionally this may use a Django Form which will have been bound to the data, By default this uses form validation to filter the basic input into the required types."""
rather than using the data directly. if self.form is None:
"""
return data return data
if not self.form.is_valid():
details = dict((key, map(unicode, val)) for (key, val) in self.form.errors.iteritems())
raise ResourceException(STATUS_400_BAD_REQUEST, {'detail': details})
return self.form.cleaned_data
def cleanup_response(self, data): def cleanup_response(self, data):
"""Perform any resource-specific data filtering prior to the standard HTTP """Perform any resource-specific data filtering prior to the standard HTTP
content-type serialization.""" content-type serialization.
Eg filter complex objects that cannot be serialized by json/xml/etc into basic objects that can."""
return data return data
@ -247,53 +252,57 @@ class Resource(object):
4. cleanup the response data 4. cleanup the response data
5. serialize response data into response content, using standard HTTP content negotiation 5. serialize response data into response content, using standard HTTP content negotiation
""" """
method = self.determine_method(request)
emitter = None emitter = None
form = None
# We make these attributes to allow for a certain amount of munging,
# eg The HTML emitter needs to render this information
self.method = self.determine_method(request)
self.form = None
self.resp_status = None
self.resp_content = None
self.resp_headers = {}
try: try:
# Before we attempt anything else determine what format to emit our response data with. # Before we attempt anything else determine what format to emit our response data with.
mimetype, emitter = self.determine_emitter(request) mimetype, emitter = self.determine_emitter(request)
# Ensure the requested operation is permitted on this resource # Ensure the requested operation is permitted on this resource
self.check_method_allowed(method) self.check_method_allowed(self.method)
# Get the appropriate create/read/update/delete function # Get the appropriate create/read/update/delete function
func = getattr(self, self.CALLMAP.get(method, '')) func = getattr(self, self.CALLMAP.get(self.method, ''))
# Either generate the response data, deserializing and validating any request data # Either generate the response data, deserializing and validating any request data
if method in ('PUT', 'POST'): if self.method in ('PUT', 'POST'):
parser = self.determine_parser(request) parser = self.determine_parser(request)
data = parser(self, request).parse(request.raw_post_data) data = parser(self).parse(request.raw_post_data)
form = self.determine_form(input_data=data) self.form = self.determine_form(data)
data = self.cleanup_request(data, form) data = self.cleanup_request(data)
(status, ret, headers) = func(data, request.META, *args, **kwargs) (self.resp_status, ret, self.resp_headers) = func(data, request.META, *args, **kwargs)
else: else:
(status, ret, headers) = func(request.META, *args, **kwargs) (self.resp_status, ret, self.resp_headers) = func(request.META, *args, **kwargs)
form = self.determine_form(return_data=ret) self.form = self.determine_form(ret, is_response=True)
except ResourceException, exc: except ResourceException, exc:
(status, ret, headers) = (exc.status, exc.content, exc.headers) (self.resp_status, ret, self.resp_headers) = (exc.status, exc.content, exc.headers)
# Use a default emitter if request failed without being able to determine an acceptable emitter
if emitter is None: if emitter is None:
mimetype, emitter = self.emitters[0] mimetype, emitter = self.emitters[0]
if self.form is None:
self.form = self.determine_form()
# Create an unbound form if one has not yet been created
if form is None:
form = self.determine_form()
# Always add the allow header # Always add the allow header
headers['Allow'] = ', '.join([self.REVERSE_CALLMAP[operation] for operation in self.allowed_operations]) self.resp_headers['Allow'] = ', '.join([self.REVERSE_CALLMAP[operation] for operation in self.allowed_operations])
# Serialize the response content # Serialize the response content
ret = self.cleanup_response(ret) ret = self.cleanup_response(ret)
content = emitter(self, request, status, headers, form).emit(ret) content = emitter(self).emit(ret)
# Build the HTTP Response # Build the HTTP Response
resp = HttpResponse(content, mimetype=mimetype, status=status) resp = HttpResponse(content, mimetype=mimetype, status=self.resp_status)
for (key, val) in headers.items(): for (key, val) in self.resp_headers.items():
resp[key] = val resp[key] = val
return resp return resp
@ -313,10 +322,10 @@ class ModelResource(Resource):
fields = None fields = None
form_fields = None form_fields = None
def determine_form(self, input_data=None, return_data=None): def determine_form(self, data=None, is_response=False):
"""Return a form that may be used in validation and/or rendering an html emitter""" """Return a form that may be used in validation and/or rendering an html emitter"""
if self.form: if self.form:
return self.form return super(self.__class__, self).determine_form(data, is_response=is_response)
elif self.model: elif self.model:
class NewModelForm(ModelForm): class NewModelForm(ModelForm):
@ -324,26 +333,17 @@ class ModelResource(Resource):
model = self.model model = self.model
fields = self.form_fields if self.form_fields else None #self.fields fields = self.form_fields if self.form_fields else None #self.fields
if input_data: if data and not is_response:
return NewModelForm(input_data) return NewModelForm(data)
elif return_data: elif data and is_response:
return NewModelForm(instance=return_data) return NewModelForm(instance=data)
else: else:
return NewModelForm() return NewModelForm()
else: else:
return None return None
def cleanup_request(self, data, form=None):
"""Filter data into form-cleaned data, performing validation and type coercion."""
if form is None:
return data
if not form.is_valid():
details = dict((key, map(unicode, val)) for (key, val) in form.errors.iteritems())
raise ResourceException(STATUS_400_BAD_REQUEST, {'detail': details})
return form.cleaned_data
def cleanup_response(self, data): def cleanup_response(self, data):
""" """
@ -614,7 +614,7 @@ class ModelResource(Resource):
try: try:
instance = self.model.objects.get(**kwargs) instance = self.model.objects.get(**kwargs)
except self.model.DoesNotExist: except self.model.DoesNotExist:
return (404, '', {}) return (404, None, {})
return (200, instance, {}) return (200, instance, {})
@ -633,13 +633,14 @@ class ModelResource(Resource):
def delete(self, headers={}, *args, **kwargs): def delete(self, headers={}, *args, **kwargs):
instance = self.model.objects.get(**kwargs) instance = self.model.objects.get(**kwargs)
instance.delete() instance.delete()
return (204, '', {}) return (204, None, {})
class QueryModelResource(ModelResource): class QueryModelResource(ModelResource):
allowed_methods = ('read',) allowed_methods = ('read',)
def determine_form(self, input_data=None, return_data=None): def determine_form(self, data=None, is_response=False):
return None return None
def read(self, headers={}, *args, **kwargs): def read(self, headers={}, *args, **kwargs):