--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/py_ext/modules/svgui/pyjs/jsonrpc/django/jsonrpc.py Tue May 08 17:08:45 2012 +0200
@@ -0,0 +1,226 @@
+# jsonrpc.py
+# original code: http://trac.pyworks.org/pyjamas/wiki/DjangoWithPyJamas
+# also from: http://www.pimentech.fr/technologies/outils
+from django.utils import simplejson
+from django.http import HttpResponse
+import sys
+
+from pyjs.jsonrpc import JSONRPCServiceBase
+# JSONRPCService and jsonremote are used in combination to drastically
+# simplify the provision of JSONRPC services. use as follows:
+#
+# jsonservice = JSONRPCService()
+#
+# @jsonremote(jsonservice)
+# def test(request, echo_param):
+# return "echoing the param back: %s" % echo_param
+#
+# dump jsonservice into urlpatterns:
+# (r'^service1/$', 'djangoapp.views.jsonservice'),
+
+class JSONRPCService(JSONRPCServiceBase):
+
+ def __call__(self, request, extra=None):
+ return self.process(request.raw_post_data)
+
+def jsonremote(service):
+ """Make JSONRPCService a decorator so that you can write :
+
+ from jsonrpc import JSONRPCService
+ chatservice = JSONRPCService()
+
+ @jsonremote(chatservice)
+ def login(request, user_name):
+ (...)
+ """
+ def remotify(func):
+ if isinstance(service, JSONRPCService):
+ service.add_method(func.__name__, func)
+ else:
+ emsg = 'Service "%s" not found' % str(service.__name__)
+ raise NotImplementedError, emsg
+ return func
+ return remotify
+
+
+# FormProcessor provides a mechanism for turning Django Forms into JSONRPC
+# Services. If you have an existing Django app which makes prevalent
+# use of Django Forms it will save you rewriting the app.
+# use as follows. in djangoapp/views.py :
+#
+# class SimpleForm(forms.Form):
+# testfield = forms.CharField(max_length=100)
+#
+# class SimpleForm2(forms.Form):
+# testfield = forms.CharField(max_length=20)
+#
+# processor = FormProcessor({'processsimpleform': SimpleForm,
+# 'processsimpleform2': SimpleForm2})
+#
+# this will result in a JSONRPC service being created with two
+# RPC functions. dump "processor" into urlpatterns to make it
+# part of the app:
+# (r'^formsservice/$', 'djangoapp.views.processor'),
+
+from django import forms
+
+def builderrors(form):
+ d = {}
+ for error in form.errors.keys():
+ if error not in d:
+ d[error] = []
+ for errorval in form.errors[error]:
+ d[error].append(unicode(errorval))
+ return d
+
+
+# contains the list of arguments in each field
+field_names = {
+ 'CharField': ['max_length', 'min_length'],
+ 'IntegerField': ['max_value', 'min_value'],
+ 'FloatField': ['max_value', 'min_value'],
+ 'DecimalField': ['max_value', 'min_value', 'max_digits', 'decimal_places'],
+ 'DateField': ['input_formats'],
+ 'DateTimeField': ['input_formats'],
+ 'TimeField': ['input_formats'],
+ 'RegexField': ['max_length', 'min_length'], # sadly we can't get the expr
+ 'EmailField': ['max_length', 'min_length'],
+ 'URLField': ['max_length', 'min_length', 'verify_exists', 'user_agent'],
+ 'ChoiceField': ['choices'],
+ 'FilePathField': ['path', 'match', 'recursive', 'choices'],
+ 'IPAddressField': ['max_length', 'min_length'],
+ }
+
+def describe_field_errors(field):
+ res = {}
+ field_type = field.__class__.__name__
+ msgs = {}
+ for n, m in field.error_messages.items():
+ msgs[n] = unicode(m)
+ res['error_messages'] = msgs
+ if field_type in ['ComboField', 'MultiValueField', 'SplitDateTimeField']:
+ res['fields'] = map(describe_field, field.fields)
+ return res
+
+def describe_fields_errors(fields, field_names):
+ res = {}
+ if not field_names:
+ field_names = fields.keys()
+ for name in field_names:
+ field = fields[name]
+ res[name] = describe_field_errors(field)
+ return res
+
+def describe_field(field):
+ res = {}
+ field_type = field.__class__.__name__
+ for fname in field_names.get(field_type, []) + \
+ ['help_text', 'label', 'initial', 'required']:
+ res[fname] = getattr(field, fname)
+ if field_type in ['ComboField', 'MultiValueField', 'SplitDateTimeField']:
+ res['fields'] = map(describe_field, field.fields)
+ return res
+
+def describe_fields(fields, field_names):
+ res = {}
+ if not field_names:
+ field_names = fields.keys()
+ for name in field_names:
+ field = fields[name]
+ res[name] = describe_field(field)
+ return res
+
+class FormProcessor(JSONRPCService):
+ def __init__(self, forms, _formcls=None):
+
+ if _formcls is None:
+ JSONRPCService.__init__(self)
+ for k in forms.keys():
+ s = FormProcessor({}, forms[k])
+ self.add_method(k, s.__process)
+ else:
+ JSONRPCService.__init__(self, forms)
+ self.formcls = _formcls
+
+ def __process(self, request, params, command=None):
+
+ f = self.formcls(params)
+
+ if command is None: # just validate
+ if not f.is_valid():
+ return {'success':False, 'errors': builderrors(f)}
+ return {'success':True}
+
+ elif command.has_key('describe_errors'):
+ field_names = command['describe_errors']
+ return describe_fields_errors(f.fields, field_names)
+
+ elif command.has_key('describe'):
+ field_names = command['describe']
+ return describe_fields(f.fields, field_names)
+
+ elif command.has_key('save'):
+ if not f.is_valid():
+ return {'success':False, 'errors': builderrors(f)}
+ instance = f.save() # XXX: if you want more, over-ride save.
+ return {'success': True, 'instance': json_convert(instance) }
+
+ elif command.has_key('html'):
+ return {'success': True, 'html': f.as_table()}
+
+ return "unrecognised command"
+
+
+
+
+# The following is incredibly convenient for saving vast amounts of
+# coding, avoiding doing silly things like this:
+# jsonresult = {'field1': djangoobject.field1,
+# 'field2': djangoobject.date.strftime('%Y.%M'),
+# ..... }
+#
+# The date/time flatten function is there because JSONRPC doesn't
+# support date/time objects or formats, so conversion to a string
+# is the most logical choice. pyjamas, being python, can easily
+# be used to parse the string result at the other end.
+#
+# use as follows:
+#
+# jsonservice = JSONRPCService()
+#
+# @jsonremote(jsonservice)
+# def list_some_model(request, start=0, count=10):
+# l = SomeDjangoModelClass.objects.filter()
+# res = json_convert(l[start:end])
+#
+# @jsonremote(jsonservice)
+# def list_another_model(request, start=0, count=10):
+# l = AnotherDjangoModelClass.objects.filter()
+# res = json_convert(l[start:end])
+#
+# dump jsonservice into urlpatterns to make the two RPC functions,
+# list_some_model and list_another_model part of the django app:
+# (r'^service1/$', 'djangoapp.views.jsonservice'),
+
+from django.core.serializers import serialize
+import datetime
+from datetime import date
+
+def dict_datetimeflatten(item):
+ d = {}
+ for k, v in item.items():
+ k = str(k)
+ if isinstance(v, datetime.date):
+ d[k] = str(v)
+ elif isinstance(v, dict):
+ d[k] = dict_datetimeflatten(v)
+ else:
+ d[k] = v
+ return d
+
+def json_convert(l, fields=None):
+ res = []
+ for item in serialize('python', l, fields=fields):
+ res.append(dict_datetimeflatten(item))
+ return res
+