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February 8, 2018 18:28
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load_station_data.py
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#!/usr/bin/env python3 | |
import codecs | |
import csv | |
import urllib.request | |
import json | |
import redis | |
import sys | |
from urllib.error import URLError | |
rental_flags = { | |
'KEY': 1, | |
'CREDITCARD':2, | |
'PAYPASS': 4, | |
'APPLEPAY': 8, | |
'ANDROIDPAY': 16, | |
'TRANSITCARD':32, | |
'ACCOUNTNUMBER': 64, | |
'PHONE': 128, | |
} | |
station_data_size = [] | |
def encode_rental_methods(method_list): | |
"Encodes the rental method list as an integer" | |
code = 0x00 | |
for method in method_list: | |
code |= rental_flags.get(method, 0) | |
return code | |
def decode_rental_methods(code): | |
rental_methods = [] | |
for method, flag in rental_flags.items(): | |
if code & flag == flag: | |
rental_methods.append(method) | |
return sorted(rental_methods, key=lambda x: rental_flags[x]) | |
def station_status_feed_url(main_feed): | |
"Find the station status feed url from the main feed results" | |
subfeed_urls = main_feed['data']['en']['feeds'] | |
for subfeed in subfeed_urls: | |
if subfeed['name'] == 'station_information': | |
return subfeed['url'] | |
return None | |
def system_information_feed_url(main_feed): | |
subfeed_urls = main_feed['data']['en']['feeds'] | |
for subfeed in subfeed_urls: | |
if subfeed['name'] == 'system_information': | |
return subfeed['url'] | |
return None | |
def fetch_url(url): | |
"Fetches a gbfs feed url and parses the feed into JSON objects" | |
try: | |
with urllib.request.urlopen(url) as resp: | |
if resp.status != 200: | |
raise Exception("Failed to load url: {} status = {}".format(url, resp.status)) | |
raw_feed = resp.read() | |
feed = json.loads(raw_feed) | |
return feed | |
except URLError as urlerr: | |
print("Failed to load url: {} ({})".format(url, str(urlerr))) | |
return None | |
def fetch_csv(csvurl): | |
"Fetches the list of known GBFS feeds from master csv list" | |
with urllib.request.urlopen(csvurl) as resp: | |
if resp.status != 200: | |
raise Exception("Failed to load url {} status = {}".format(csvurl, resp.status)) | |
feedlist = [] | |
gbfs_csv_reader = csv.DictReader(codecs.iterdecode(resp, 'utf-8')) | |
for row in gbfs_csv_reader: | |
feedlist.append((row['Name'], row['Location'], row['Auto-Discovery URL'])) | |
return feedlist | |
def load_system_info(r, system_info_url): | |
"Loads the system information feed and returns the system id" | |
system_info_feed = fetch_url(system_info_url) | |
system_id = system_info_feed['data']['system_id'] | |
key = "{}:system_info".format(system_id) | |
r.hmset(key, system_info_feed['data']) | |
return system_id | |
def load_station_info(r, system_id, station_info_url): | |
"Takes the station info url and parses the results into JSON objects" | |
# parse feed into JSON | |
info_feed = fetch_url(station_info_url) | |
# fetch station data | |
updated_at = info_feed['last_updated'] | |
stations = info_feed['data']['stations'] | |
# check for the existence of stations, some feeds don't have them | |
if not stations: | |
return | |
# define keys for data load | |
global_station_loc_key = "global:stations:location" | |
station_set_key = "{}:stations".format(system_id) | |
station_loc_key = "{}:stations:location".format(system_id) | |
staging_key_station_set = "staging:{}:stations".format(system_id) | |
# get the current set of stations for the system | |
current_stations = r.smembers(station_set_key) | |
#print(current_stations) | |
# iteratively load stations into staging keys | |
for station in stations: | |
# encode rental methods for storage (optional field) | |
if 'rental_methods' in station.keys(): | |
station['rental_methods'] = encode_rental_methods(station['rental_methods']) | |
station['updated_at'] = updated_at | |
station_key = "{}:station:{}".format(system_id, station['station_id']) | |
# build a txn to update the station data | |
p = r.pipeline(transaction=True) | |
p.delete(station_key) | |
p.hmset(station_key, station) | |
p.sadd(station_set_key, station_key) | |
p.execute_command("GEOADD", global_station_loc_key, station['lon'], station['lat'], station_key) | |
p.execute_command("GEOADD", station_loc_key, station['lon'], station['lat'], station_key) | |
p.execute() | |
# remove station from list of old stations | |
current_stations.discard(station_key) | |
# remove any of the old stations | |
for station in current_stations: | |
station_key = "{}:station:{}".format(system_id, station) | |
p = r.pipeline(transaction=True) | |
p.delete(station) | |
p.srem(station_key, station) | |
p.zrem(global_station_loc_key, station_key) | |
p.zrem(station_loc_key, station_key) | |
p.execute() | |
def process_feed(r, feed_url): | |
"Processes the mail feed and loads data into Redis" | |
feed = fetch_url(feed_url) | |
if feed is None: | |
raise Exception("Unable to load discovery feed: " + feed_url) | |
system_info_url = system_information_feed_url(feed) | |
if system_info_url is None: | |
raise Exception("Unable to find system information feed") | |
station_info_url = station_status_feed_url(feed) | |
if station_info_url is None: | |
raise Exception("Unable to find station information feed") | |
system_id = load_system_info(r, system_info_url) | |
r.sadd("geobike:systems", system_id) | |
load_station_info(r, system_id, station_info_url) | |
# notify intersted clients that fresh data was loaded | |
r.publish("geobike:station_changed", system_id) | |
def process_feed_list(r, master_csv): | |
"Parse the master csv file of known GBFS feeds" | |
for name, location, feed_url in fetch_csv(master_csv): | |
print("Processing feed for {} in {}".format(name, location)) | |
try: | |
process_feed(r, feed_url) | |
except Exception as e: | |
print(e) | |
if __name__ == '__main__': | |
# provide your redis configuration infromation here | |
cfg = { 'host': 'localhost', | |
'port': 6379, | |
'password': None, | |
'ssl': False | |
} | |
master_feed_list = "https://raw.githubusercontent.com/tague/gbfs/master/systems.csv" | |
r = redis.StrictRedis(**cfg, decode_responses=True) | |
process_feed_list(r, master_feed_list) | |
sys.exit(0) |
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