colouring-montreal/etl/join_building_data/load_csv.py

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"""Join csv data to buildings
Example usage (replace URL with test/staging/localhost as necessary, API key with real key for
the appropriate site):
python load_csv.py \
https://colouring.london \
a0a00000-0a00-0aaa-a0a0-0000aaaa0000 \
data.csv
This script uses the HTTP API, and can process CSV files which identify buildings by id, TOID,
UPRN.
The process:
- assume first line of the CSV is a header, where column names are either
- building identifiers - one of:
- building_id
- toid
- uprn
- building data field names
- read through lines of CSV:
- use building id if provided
- else lookup by toid
- else lookup by uprn
- else locate building by representative point
- update building
TODO extend to allow latitude,longitude or easting,northing columns and lookup by location.
"""
import csv
import json
import os
import sys
import requests
def main(base_url, api_key, source_file):
"""Read from file, update buildings
"""
with open(source_file, 'r') as source:
reader = csv.DictReader(source)
for line in reader:
building_id = find_building(line, base_url)
if building_id is None:
continue
if 'sust_dec' in line and line['sust_dec'] == '':
del line['sust_dec']
response_code, response_data = update_building(building_id, line, api_key, base_url)
if response_code != 200:
print('ERROR', building_id, response_code, response_data)
else:
print('DEBUG', building_id, response_code, response_data)
def update_building(building_id, data, api_key, base_url):
"""Save data to a building
"""
r = requests.post(
"{}/api/buildings/{}.json".format(base_url, building_id),
params={'api_key': api_key},
json=data
)
return r.status_code, r.json()
def find_building(data, base_url):
if 'building_id' in data:
return data['building_id']
if 'toid' in data:
building_id = find_by_reference(base_url, 'toid', data['toid'])
if building_id is not None:
print("match_by_toid", data['toid'], building_id)
return building_id
if 'uprn' in data:
building_id = find_by_reference(base_url, 'uprn', data['uprn'])
if building_id is not None:
print("match_by_uprn", data['uprn'], building_id)
return building_id
print("no_match", data)
return None
def find_by_reference(base_url, ref_key, ref_id):
"""Find building_id by TOID or UPRN
"""
r = requests.get("{}/api/buildings/reference".format(base_url), params={
'key': ref_key,
'id': ref_id
})
buildings = r.json()
if buildings and 'error' not in buildings and len(buildings) == 1:
building_id = buildings[0]['building_id']
else:
building_id = None
return building_id
if __name__ == '__main__':
try:
url, api_key, filename = sys.argv[1], sys.argv[2], sys.argv[3]
except IndexError:
print(
"Usage: {} <URL> <api_key> ./path/to/data.csv".format(
os.path.basename(__file__)
))
exit()
main(url, api_key, filename)