RunasSudo/virtual-metro
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Implement caching

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This commit is contained in:
RunasSudo 2019-01-11 21:20:58 +11:00
parent 6804506e84
commit 4cca5f231f
Signed by: RunasSudo
GPG Key ID: 7234E476BF21C61A
1 changed files with 19 additions and 8 deletions
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23
virtual_metro/__init__.py
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@ -10,21 +10,35 @@ import hmac
import json import json
import pytz import pytz
from binascii import hexlify from binascii import hexlify
from datetime import datetime from datetime import datetime, timedelta
from urllib.parse import urlencode from urllib.parse import urlencode
from urllib.request import Request, urlopen from urllib.request import Request, urlopen
request_cache = {}
def do_request(endpoint, args=None): def do_request(endpoint, args=None):
url = endpoint + '?devid=' + config.PTV_USER_ID url = endpoint + '?devid=' + config.PTV_USER_ID
if args: if args:
url += '&' + urlencode(args) url += '&' + urlencode(args)
# Check cache
timenow = pytz.utc.localize(datetime.utcnow()).astimezone(timezone)
cachexp = timenow - timedelta(seconds=60)
if url in request_cache:
if request_cache[url][0] >= cachexp:
# Use cached response
return request_cache[url][1]
# Generate signature # Generate signature
signature = hexlify(hmac.digest(config.PTV_API_KEY.encode('ascii'), url.encode('ascii'), 'sha1')).decode('ascii') signature = hexlify(hmac.digest(config.PTV_API_KEY.encode('ascii'), url.encode('ascii'), 'sha1')).decode('ascii')
req = Request('https://timetableapi.ptv.vic.gov.au' + url + '&signature=' + signature, headers={'User-Agent': 'virtual-metro/0.1'}) req = Request('https://timetableapi.ptv.vic.gov.au' + url + '&signature=' + signature, headers={'User-Agent': 'virtual-metro/0.1'})
resp = urlopen(req) resp = urlopen(req)
return json.load(resp) data = json.load(resp)
# Cache the response
request_cache[url] = (timenow, data)
return data
def parse_date(dtstring): def parse_date(dtstring):
return pytz.utc.localize(datetime.strptime(dtstring, '%Y-%m-%dT%H:%M:%SZ')).astimezone(timezone) return pytz.utc.localize(datetime.strptime(dtstring, '%Y-%m-%dT%H:%M:%SZ')).astimezone(timezone)
@ -48,7 +62,6 @@ def stop_to_name(stop, route_id):
name = 'South Kensington' name = 'South Kensington'
return name return name
route_stops = {} # Cache lookup
def parse_departure(departure, departures, timenow): def parse_departure(departure, departures, timenow):
result = {} result = {}
result['dest'] = departures['runs'][str(departure['run_id'])]['destination_name'] result['dest'] = departures['runs'][str(departure['run_id'])]['destination_name']
@ -65,13 +78,11 @@ def parse_departure(departure, departures, timenow):
pattern_stops = [(x['stop_id'], stop_to_name(pattern['stops'][str(x['stop_id'])], departure['route_id']), False) for x in pattern['departures']] pattern_stops = [(x['stop_id'], stop_to_name(pattern['stops'][str(x['stop_id'])], departure['route_id']), False) for x in pattern['departures']]
# Get all stops on route # Get all stops on route
if (departure['route_id'], departure['direction_id']) not in route_stops:
stops = do_request('/v3/stops/route/{}/route_type/{}'.format(departure['route_id'], ROUTE_TYPE), {'direction_id': departure['direction_id']}) stops = do_request('/v3/stops/route/{}/route_type/{}'.format(departure['route_id'], ROUTE_TYPE), {'direction_id': departure['direction_id']})
stops['stops'].sort(key=lambda x: x['stop_sequence']) stops['stops'].sort(key=lambda x: x['stop_sequence'])
route_stops[(departure['route_id'], departure['direction_id'])] = stops['stops']
route_stops_dir = [] route_stops_dir = []
for stop in route_stops[(departure['route_id'], departure['direction_id'])]: for stop in stops['stops']:
# Cut off at Flinders Street # Cut off at Flinders Street
route_stops_dir.append(stop) route_stops_dir.append(stop)
if stop_to_name(stop, departure['route_id']) == 'Flinders Street': if stop_to_name(stop, departure['route_id']) == 'Flinders Street':