38c67ee588
When a acceptable zoom level is reached, the frontend is going to query the DB for the eligibility data associated to the region the user is viewing. When requesting too much data, the frontend gets pretty slow. In order to prevent that, we require a minimal zoom level before triggering the actual request.
78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
from flask import Flask, request, render_template
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from typing import TypedDict
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import configparser
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import sqlite3
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import os
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class Config(TypedDict):
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dbPath: str
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def parseConfig() -> Config:
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cfg_path = os.environ.get("CONFIG", "/etc/ipe-ftth-elig/conf.ini")
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cfg = configparser.ConfigParser()
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with open(cfg_path, "r") as f:
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cfg.read_file(f)
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return {'dbPath':cfg.get("DB","path")}
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app = Flask(__name__)
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cfg:Config = parseConfig()
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@app.route("/", methods=["GET"])
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def getMap():
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return render_template("map.html")
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@app.route("/eligdata", methods=["GET"])
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def getEligData():
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args = request.args
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valid_args = True
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processed_args = {}
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for k in ['swx', 'swy', 'nex', 'ney']:
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valid_args = valid_args and k in args
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if valid_args:
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try:
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processed_args[k] = float(args[k])
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except ValueError:
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valid_args = False
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if valid_args:
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cur = cursorWithSpatialite()
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# Let's first see how big is the area we're about to query.
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# If it's too big, abort the request to prevent a server DOS.
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cur.execute('''
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SELECT Area(BuildMBR(:swx,:swy,:nex,:ney,4326))
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''',processed_args)
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req_area = cur.fetchone()[0]
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if req_area <= 0.08:
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cur.execute('''
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SELECT
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X(ImmeubleGeoPoint),
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Y(ImmeubleGeoPoint),
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IdentifiantImmeuble,
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EtatImmeuble,
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NumeroVoieImmeuble,
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TypeVoieImmeuble,
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NomVoieImmeuble
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FROM ipe
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WHERE ROWID IN (
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SELECT ROWID FROM SpatialIndex
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WHERE f_table_name = 'ipe' AND
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search_frame = BuildMBR(:swx, :swy, :nex, :ney, 4326))
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''',processed_args)
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buildings = [ {
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'x':b[0], 'y':b[1], 'idImm':b[2],
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'etatImm':b[3], 'numVoieImm': b[4],
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'typeVoieImm': b[5], 'nomVoieImm': b[6]
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} for b in cur.fetchall()]
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return { "buildings": buildings}
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else:
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return "The requested area is too wide, please reduce it", 400
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else:
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return "Invalid bounding box coordinates", 400
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def cursorWithSpatialite():
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db = sqlite3.connect(cfg['dbPath'])
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cur = db.cursor()
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db.enable_load_extension(True)
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cur.execute('SELECT load_extension("mod_spatialite")')
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return cur
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