@ -0,0 +1,23 @@
|
||||
# Generated by Django 5.0.1 on 2024-01-09 10:38
|
||||
|
||||
from django.db import migrations, models
|
||||
|
||||
|
||||
class Migration(migrations.Migration):
|
||||
|
||||
dependencies = [
|
||||
('konova', '0014_resubmission'),
|
||||
]
|
||||
|
||||
operations = [
|
||||
migrations.AddField(
|
||||
model_name='geometry',
|
||||
name='parcel_update_end',
|
||||
field=models.DateTimeField(blank=True, db_comment='When the last parcel calculation finished', help_text='When the last parcel calculation finished', null=True),
|
||||
),
|
||||
migrations.AddField(
|
||||
model_name='geometry',
|
||||
name='parcel_update_start',
|
||||
field=models.DateTimeField(blank=True, db_comment='When the last parcel calculation started', help_text='When the last parcel calculation started', null=True),
|
||||
),
|
||||
]
|
||||
@ -0,0 +1,17 @@
|
||||
# Generated by Django 5.0.1 on 2024-02-16 07:34
|
||||
|
||||
from django.db import migrations
|
||||
|
||||
|
||||
class Migration(migrations.Migration):
|
||||
|
||||
dependencies = [
|
||||
('konova', '0015_geometry_parcel_calculation_end_and_more'),
|
||||
]
|
||||
|
||||
operations = [
|
||||
migrations.RemoveField(
|
||||
model_name='parcelintersection',
|
||||
name='calculated_on',
|
||||
),
|
||||
]
|
||||
@ -1,189 +0,0 @@
|
||||
"""
|
||||
Author: Michel Peltriaux
|
||||
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
|
||||
Contact: michel.peltriaux@sgdnord.rlp.de
|
||||
Created on: 17.12.21
|
||||
|
||||
"""
|
||||
import json
|
||||
from abc import abstractmethod
|
||||
from json import JSONDecodeError
|
||||
from time import sleep
|
||||
|
||||
import requests
|
||||
from django.contrib.gis.db.models.functions import AsGML, MakeValid
|
||||
from django.db.models import Func, F
|
||||
from requests.auth import HTTPDigestAuth
|
||||
|
||||
from konova.settings import PARCEL_WFS_USER, PARCEL_WFS_PW, PROXIES
|
||||
|
||||
|
||||
class AbstractWFSFetcher:
|
||||
""" Base class for fetching WFS data
|
||||
|
||||
"""
|
||||
# base_url represents not the capabilities url but the parameter-free base url
|
||||
base_url = None
|
||||
version = None
|
||||
auth_user = None
|
||||
auth_pw = None
|
||||
auth_digest_obj = None
|
||||
|
||||
class Meta:
|
||||
abstract = True
|
||||
|
||||
def __init__(self, base_url: str, version: str = "1.1.0", auth_user: str = None, auth_pw: str = None, *args, **kwargs):
|
||||
self.base_url = base_url
|
||||
self.version = version
|
||||
self.auth_pw = auth_pw
|
||||
self.auth_user = auth_user
|
||||
|
||||
self._create_auth_obj()
|
||||
|
||||
def _create_auth_obj(self):
|
||||
if self.auth_pw is not None and self.auth_user is not None:
|
||||
self.auth_digest_obj = HTTPDigestAuth(
|
||||
self.auth_user,
|
||||
self.auth_pw
|
||||
)
|
||||
|
||||
@abstractmethod
|
||||
def get_features(self, feature_identifier: str, filter_str: str):
|
||||
raise NotImplementedError
|
||||
|
||||
|
||||
class ParcelWFSFetcher(AbstractWFSFetcher):
|
||||
""" Fetches features from a special parcel WFS
|
||||
|
||||
"""
|
||||
geometry_id = None
|
||||
geometry_property_name = None
|
||||
count = 100
|
||||
|
||||
def __init__(self, geometry_id: str, geometry_property_name: str = "msGeometry", *args, **kwargs):
|
||||
super().__init__(
|
||||
version="2.0.0",
|
||||
base_url="https://www.geoportal.rlp.de/registry/wfs/519",
|
||||
auth_user=PARCEL_WFS_USER,
|
||||
auth_pw=PARCEL_WFS_PW,
|
||||
*args,
|
||||
**kwargs
|
||||
)
|
||||
self.geometry_id = geometry_id
|
||||
self.geometry_property_name = geometry_property_name
|
||||
|
||||
def _create_spatial_filter(self,
|
||||
geometry_operation: str):
|
||||
""" Creates a xml spatial filter according to the WFS filter specification
|
||||
|
||||
The geometry needs to be shrinked by a very small factor (-0.01) before a GML can be created for intersection
|
||||
checking. Otherwise perfect parcel outline placement on top of a neighbouring parcel would result in an
|
||||
intersection hit, despite the fact they do not truly intersect just because their vertices match.
|
||||
|
||||
Args:
|
||||
geometry_operation (str): One of the WFS supported spatial filter operations (according to capabilities)
|
||||
|
||||
Returns:
|
||||
spatial_filter (str): The spatial filter element
|
||||
"""
|
||||
from konova.models import Geometry
|
||||
|
||||
geom = Geometry.objects.filter(
|
||||
id=self.geometry_id
|
||||
).annotate(
|
||||
smaller=Func(F('geom'), -0.001, function="ST_Buffer") # same as geometry.geom_small_buffered but for QuerySet
|
||||
).annotate(
|
||||
gml=AsGML(MakeValid('smaller'))
|
||||
).first()
|
||||
geom_gml = geom.gml
|
||||
spatial_filter = f"<Filter><{geometry_operation}><PropertyName>{self.geometry_property_name}</PropertyName>{geom_gml}</{geometry_operation}></Filter>"
|
||||
return spatial_filter
|
||||
|
||||
def _create_post_data(self,
|
||||
geometry_operation: str,
|
||||
typenames: str = None,
|
||||
start_index: int = 0,
|
||||
):
|
||||
""" Creates a POST body content for fetching features
|
||||
|
||||
Args:
|
||||
geometry_operation (str): One of the WFS supported spatial filter operations (according to capabilities)
|
||||
|
||||
Returns:
|
||||
_filter (str): A proper xml WFS filter
|
||||
"""
|
||||
start_index = str(start_index)
|
||||
spatial_filter = self._create_spatial_filter(
|
||||
geometry_operation
|
||||
)
|
||||
_filter = f'<wfs:GetFeature service="WFS" version="{self.version}" xmlns:wfs="http://www.opengis.net/wfs/2.0" xmlns:fes="http://www.opengis.net/fes/2.0" xmlns:myns="http://www.someserver.com/myns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs/2.0 http://schemas.opengis.net/wfs/2.0.0/wfs.xsd" count="{self.count}" startindex="{start_index}" outputFormat="application/json; subtype=geojson"><wfs:Query typeNames="{typenames}">{spatial_filter}</wfs:Query></wfs:GetFeature>'
|
||||
return _filter
|
||||
|
||||
def get_features(self,
|
||||
typenames: str,
|
||||
spatial_operator: str = "Intersects",
|
||||
filter_srid: str = None,
|
||||
start_index: int = 0,
|
||||
rerun_on_exception: bool = True
|
||||
):
|
||||
""" Fetches features from the WFS using POST
|
||||
|
||||
POST is required since GET has a character limit around 4000. Having a larger filter would result in errors,
|
||||
which do not occur in case of POST.
|
||||
|
||||
Args:
|
||||
typenames (str): References to parameter 'typenames' in a WFS GetFeature request
|
||||
spatial_operator (str): Defines the spatial operation for filtering
|
||||
filter_srid (str): Defines the spatial reference system, the geometry shall be transformed into for filtering
|
||||
start_index (str): References to parameter 'startindex' in a
|
||||
|
||||
Returns:
|
||||
features (list): A list of returned features
|
||||
"""
|
||||
found_features = []
|
||||
while start_index is not None:
|
||||
post_body = self._create_post_data(
|
||||
spatial_operator,
|
||||
typenames,
|
||||
start_index
|
||||
)
|
||||
response = requests.post(
|
||||
url=self.base_url,
|
||||
data=post_body,
|
||||
auth=self.auth_digest_obj,
|
||||
proxies=PROXIES,
|
||||
)
|
||||
|
||||
content = response.content.decode("utf-8")
|
||||
try:
|
||||
# Check if collection is an exception and does not contain the requested data
|
||||
content = json.loads(content)
|
||||
except JSONDecodeError as e:
|
||||
if rerun_on_exception:
|
||||
# Wait a second before another try
|
||||
sleep(1)
|
||||
self.get_features(
|
||||
typenames,
|
||||
spatial_operator,
|
||||
filter_srid,
|
||||
start_index,
|
||||
rerun_on_exception=False
|
||||
)
|
||||
else:
|
||||
e.msg += content
|
||||
raise e
|
||||
fetched_features = content.get(
|
||||
"features",
|
||||
{},
|
||||
)
|
||||
|
||||
found_features += fetched_features
|
||||
|
||||
if len(fetched_features) < self.count:
|
||||
# The response was not 'full', so we got everything to fetch
|
||||
start_index = None
|
||||
else:
|
||||
# If a 'full' response returned, there might be more to fetch. Increase the start_index!
|
||||
start_index += self.count
|
||||
|
||||
return found_features
|
||||
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Reference in New Issue