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geocoder.py
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geocoder.py
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#!/usr/bin/python
import os
import re
import orjson
from bottle import Bottle, HTTPResponse, request, response, static_file
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.sql import text
from caddy.utils import env
dot_env = os.path.join(os.getcwd(), ".env")
if os.path.exists(dot_env):
from dotenv import load_dotenv
load_dotenv()
app = application = Bottle()
# Database connection - create a DB engine and a scoped session for queries.
# https://docs.sqlalchemy.org/en/20/orm/contextual.html#unitofwork-contextual
database_url = env("DATABASE_URL").replace("postgis", "postgresql+psycopg")
db_engine = create_engine(database_url)
Session = sessionmaker(bind=db_engine, autoflush=True)
# Regex patterns
LON_LAT_PATTERN = re.compile(r"(?P<lon>-?[0-9]+.[0-9]+),\s*(?P<lat>-?[0-9]+.[0-9]+)")
ALPHANUM_PATTERN = re.compile(r"[^A-Za-z0-9\s]+")
@app.route("/")
def index():
return static_file("index.html", root="caddy/templates")
@app.route("/favicon.ico")
def favicon():
return static_file("favicon.ico", root="caddy/static")
@app.route("/livez")
def liveness():
return "OK"
@app.route("/readyz")
def readiness():
try:
with Session.begin() as session:
session.execute(text("SELECT 1")).fetchone()
return "OK"
except:
return HTTPResponse(status=500, body="Error")
@app.route("/api/<object_id>")
def detail(object_id):
# Validate `object_id`: this value needs be castable as an integer, even though we use it as a string.
try:
int(object_id)
except ValueError:
response.status = 400
return "Bad request"
response.content_type = "application/json"
sql = text("""SELECT object_id, address_nice, owner, ST_AsText(centroid), ST_AsText(envelope), ST_AsText(boundary), data
FROM shack_address
WHERE object_id = :object_id""")
sql = sql.bindparams(object_id=object_id)
with Session.begin() as session:
result = session.execute(sql).fetchone()
if result:
return orjson.dumps(
{
"object_id": result[0],
"address": result[1],
"owner": result[2],
"centroid": result[3],
"envelope": result[4],
"boundary": result[5],
"data": result[6],
}
)
else:
return "{}"
@app.route("/api/geocode")
def geocode():
q = request.query.q or ""
point = request.query.point or ""
if not q and not point:
response.status = 400
return "Bad request"
# Point intersection query
if point: # Must be in the format lon,lat
m = LON_LAT_PATTERN.match(point)
if m:
lon, lat = m.groups()
# Validate `lon` and `lat` by casting them to float values.
try:
lon, lat = float(lon), float(lat)
except ValueError:
return "{}"
ewkt = f"SRID=4326;POINT({lon} {lat})"
sql = text("""SELECT object_id, address_nice, owner, ST_AsText(centroid), ST_AsText(envelope), ST_AsText(boundary), data
FROM shack_address
WHERE ST_Intersects(boundary, ST_GeomFromEWKT(:ewkt))""")
sql = sql.bindparams(ewkt=ewkt)
with Session.begin() as session:
result = session.execute(sql).fetchone()
# Serialise and return any query result.
response.content_type = "application/json"
if result:
return orjson.dumps(
{
"object_id": result[0],
"address": result[1],
"owner": result[2],
"centroid": result[3],
"envelope": result[4],
"boundary": result[5],
"data": result[6],
}
)
else:
return "{}"
else:
response.status = 400
return "Bad request"
# Address query
# Sanitise the input query: remove any non-alphanumeric/whitespace characters.
q = re.sub(ALPHANUM_PATTERN, "", q)
words = q.split() # Split words on whitespace.
tsquery = "&".join(words)
# Default to return a maximum of five results, allow override via `limit`.
if request.query.limit:
try:
limit = int(request.query.limit)
except ValueError:
response.status = 400
return "Bad request"
else:
limit = 5
sql = text("""SELECT address_nice, owner, ST_X(centroid), ST_Y(centroid), object_id
FROM shack_address
WHERE tsv @@ to_tsquery(:tsquery)
LIMIT :limit""")
sql = sql.bindparams(tsquery=tsquery, limit=limit)
with Session.begin() as session:
result = session.execute(sql).fetchall()
# Serialise and return any query results.
response.content_type = "application/json"
if result:
j = []
for i in result:
j.append(
{
"address": i[0],
"owner": i[1],
"lon": i[2],
"lat": i[3],
"pin": i[4],
}
)
return orjson.dumps(j)
else:
return "[]"
if __name__ == "__main__":
from bottle import run
run(application, host="0.0.0.0", port=env("PORT", 8080))