svgui/pyjs/jsonrpc/django/jsonrpc.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 25 Aug 2017 11:22:08 +0300
changeset 1789 492e2cd6157e
parent 1783 3311eea28d56
child 1850 614396cbffbf
permissions -rw-r--r--
fix problem when Beremiz is running without matiec installed

set matiec settings only once on first use of ProjectController class and give
user-friendly message on compilation about missing matiec
installation.


Traceback (most recent call last):
File "Beremiz.py", line 197, in <module>
beremiz.Start()
File "Beremiz.py", line 192, in Start
self.CreateApplication()
File "Beremiz.py", line 130, in CreateApplication
self.BackgroundInitialization()
File "Beremiz.py", line 137, in BackgroundInitialization
self.ImportModules()
File "Beremiz.py", line 176, in ImportModules
import BeremizIDE
File
"BeremizIDE.py", line 76, in <module>
from ProjectController import ProjectController, GetAddMenuItems,
MATIEC_ERROR_MODEL, ITEM_CONFNODE
File
"ProjectController.py", line 177, in <module>
iec2c_cfg = Iec2CSettings()
File
"ProjectController.py", line 101, in __init__
self.ieclib_c_path = self.findLibCPath()
File
"ProjectController.py", line 135, in findLibCPath
os.path.join(self.ieclib_path, "C"),
File "/usr/lib/python2.7/posixpath.py", line 70, in join
elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'
# jsonrpc.py
#   original code: http://trac.pyworks.org/pyjamas/wiki/DjangoWithPyJamas
#   also from: http://www.pimentech.fr/technologies/outils
from datetime import date
import datetime
import sys

from django.utils import simplejson
from django.http import HttpResponse
from django import forms
from django.core.serializers import serialize


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'),


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 'describe_errors' in command:
            field_names = command['describe_errors']
            return describe_fields_errors(f.fields, field_names)

        elif 'describe' in command:
            field_names = command['describe']
            return describe_fields(f.fields, field_names)

        elif 'save' in command:
            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 'html' in command:
            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'),


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