mpeltriaux
4c7c667bdb
* adds proper fetching of GDAL Exceptions in case of further problems in the future
71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
"""
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Author: Michel Peltriaux
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Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
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Contact: ksp-servicestelle@sgdnord.rlp.de
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Created on: 14.12.22
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"""
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import json
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from json import JSONDecodeError
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import requests
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from django.contrib.gis import gdal
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from konova.sub_settings import schneider_settings
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from konova.sub_settings.lanis_settings import DEFAULT_SRID
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from konova.sub_settings.proxy_settings import PROXIES
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class ParcelFetcher:
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base_url = schneider_settings.base_url
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auth_header = schneider_settings.auth_header
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auth_header_token = schneider_settings.auth_header_token
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geometry = None
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geojson = None
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results = None
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def __init__(self, geometry):
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if geometry is None:
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raise AssertionError("Geometry must not be none")
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self.geometry = geometry
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# Reduce size of geometry to avoid "intersections" because of exact border matching
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buffer_threshold = 0.001
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geom = geometry.geom.buffer(-buffer_threshold)
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if geom.area < buffer_threshold:
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# Fallback for malicious geometries which are way too small and would disappear on negative buffering
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geom = geometry.geom
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try:
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geom.transform(DEFAULT_SRID)
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except gdal.GDALException as e:
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raise ValueError(f"{str(e)}\nCould not transform geometry (id: {geometry.id}) to {DEFAULT_SRID}:\n {geom.geojson}")
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self.geojson = geom.ewkt
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self.results = []
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def get_parcels(self, url: str = None):
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post_url = url
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if post_url is None:
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post_url = f"{self.base_url}/parcel/intersect/"
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response = requests.post(
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url=post_url,
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proxies=PROXIES,
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data=self.geojson,
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headers={
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self.auth_header: self.auth_header_token
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}
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)
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try:
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content = json.loads(response.content.decode("utf-8"))
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except JSONDecodeError:
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content = {}
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_next = content.get("next", None)
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fetched_parcels = content.get("results", [])
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self.results += fetched_parcels
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if _next:
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self.get_parcels(_next)
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return self.results |