Rework SQLite database handling to make the script more efficient
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parent
6773227ae1
commit
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159
velib.py
159
velib.py
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@ -1,11 +1,17 @@
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#!/usr/bin/env python3
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import datetime
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import json
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import logging
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import os
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import pybikes
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import sqlite3
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import time
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level = logging.WARNING
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if os.environ.get('DEBUG', False):
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level = logging.DEBUG
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logging.basicConfig(level=level)
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def db_init(db_name=None):
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"""
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@ -13,6 +19,7 @@ def db_init(db_name=None):
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Returns a new connection.
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"""
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logging.info('Initialize DB...')
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now = datetime.datetime.now()
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if db_name is None:
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db_name = "week_%s.db" % now.strftime("%V")
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@ -48,10 +55,10 @@ def db_init(db_name=None):
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"timestamp INTEGER, " +
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"event TEXT, " +
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"FOREIGN KEY(station_id) REFERENCES stations(id) ON DELETE CASCADE)")
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c.execute("CREATE INDEX IF NOT EXISTS stationstats_station_id ON stationsstats (station_id)");
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c.execute("CREATE INDEX IF NOT EXISTS stationsstats_updated ON stationsstats (updated)");
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c.execute("CREATE INDEX IF NOT EXISTS stationsevents_station_id ON stationsevents (station_id)");
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c.execute("CREATE INDEX IF NOT EXISTS stationsevents_timestamp ON stationsevents (timestamp)");
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c.execute("CREATE INDEX IF NOT EXISTS stationstats_station_id ON stationsstats (station_id)")
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c.execute("CREATE INDEX IF NOT EXISTS stationsstats_updated ON stationsstats (updated)")
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c.execute("CREATE INDEX IF NOT EXISTS stationsevents_station_id ON stationsevents (station_id)")
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c.execute("CREATE INDEX IF NOT EXISTS stationsevents_timestamp ON stationsevents (timestamp)")
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conn.commit()
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return conn
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@ -62,17 +69,35 @@ def update_stations(conn):
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:param conn: Database connection.
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"""
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logging.info('Get all stations from database...')
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c = conn.cursor()
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database_stations = {i[0]: i
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for i in
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c.execute("SELECT id, name, address, latitude, longitude, banking, bonus, bike_stands FROM stations").fetchall()}
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database_stations = {
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i[0]: i
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for i in c.execute(
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"SELECT id, name, address, latitude, longitude, banking, bonus, bike_stands FROM stations"
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).fetchall()
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}
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logging.info('Get updated Velib stations from the API...')
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velib = pybikes.get("velib")
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velib.update()
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for station in velib.stations:
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fetched_stations = {
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station.extra['uid']: station
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for station in velib.stations
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if 'uid' in station.extra
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}
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# List of SQL queries to perform for
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events = [] # events happening on stations (temporary closure etc)
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stations_update = [] # Update of stations (such as new stands number)
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new_stations = [] # New stations to add to the list
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stats = [] # Current stats of the station
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logging.info('Processing fetched stations...')
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for uid, station in fetched_stations.items():
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try:
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# Get old station entry if it exists
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old_station = database_stations[station.extra["uid"]]
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old_station = database_stations[uid]
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# Diff the two stations
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event = []
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if station.name != old_station[1]:
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@ -87,60 +112,86 @@ def update_stations(conn):
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event.append({"key": "longitude",
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"old_value": old_station[4],
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"new_value": station.longitude})
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if station.extra["banking"] != old_station[5]:
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if (
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"banking" in station.extra
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and station.extra["banking"] != old_station[5]
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):
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event.append({"key": "banking",
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"old_value": old_station[5],
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"new_value": station.extra["banking"]})
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if station.extra["slots"] != old_station[7]:
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if (
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"slots" in station.extra
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and station.extra["slots"] != old_station[7]
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):
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event.append({"key": "bike_stands",
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"old_value": old_station[7],
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"new_value": station.extra["slots"]})
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# If diff was found
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if len(event) > 0:
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# Update
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c.execute("UPDATE " +
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"stations " +
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"SET name=?, latitude=?, longitude=?, " +
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"banking=?, bike_stands=? WHERE id=?",
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(station.name,
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station.latitude,
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station.longitude,
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station.extra["banking"],
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station.extra["slots"],
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station.extra["uid"]))
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# And insert event in the table
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c.execute("INSERT INTO " +
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"stationsevents(station_id, timestamp, event) " +
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"VALUES(?, ?, ?)",
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(station.extra["uid"],
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int(time.time()),
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json.dumps(event)))
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stations_update.append(
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(station.name,
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station.latitude,
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station.longitude,
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station.extra["banking"],
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station.extra["slots"],
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uid)
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)
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events.append(
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(uid, int(time.time()), json.dumps(event))
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)
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except KeyError:
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c.execute("INSERT INTO " +
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"stations(id, name, address, latitude, longitude, banking, bonus, bike_stands) " +
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"VALUES(?, ?, ?, ?, ?, ?, ?, ?)",
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(station.extra["uid"],
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station.name,
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"", # Not available
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station.latitude,
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station.longitude,
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station.extra["banking"],
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False, # Not available
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station.extra["slots"]))
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except TypeError:
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conn.rollback()
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return
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# Add the station to the database
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new_stations.append(
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(uid,
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station.name,
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"", # Not available
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station.latitude,
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station.longitude,
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station.extra["banking"],
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False, # Not available
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station.extra["slots"])
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)
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stats.append(
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(uid,
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station.bikes - station.extra["ebikes"],
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station.extra["ebikes"],
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station.free,
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station.extra["status"],
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int(time.time())) # Not available, using current timestamp
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)
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c.execute("INSERT INTO " +
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"stationsstats(station_id, available_bikes, available_ebikes, free_stands, status, updated) " +
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"VALUES(?, ?, ?, ?, ?, ?)",
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(station.extra["uid"],
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station.bikes - station.extra["ebikes"],
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station.extra["ebikes"],
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station.free,
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station.extra["status"],
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int(time.time()))) # Not available, using current timestamp
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conn.commit()
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# Update stations
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logging.info('Updating stations in db...')
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c.executemany(
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"UPDATE stations SET name=?, latitude=?, longitude=?, " +
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"banking=?, bike_stands=? WHERE id=?",
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stations_update
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)
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# Insert events in the table
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logging.info('Storing stations events in db...')
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c.executemany(
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"INSERT INTO stationsevents(station_id, timestamp, event) " +
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"VALUES(?, ?, ?)",
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events
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)
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# Add the station to the database
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logging.info('Storing new stations in db...')
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c.executemany(
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"INSERT INTO " +
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"stations(id, name, address, latitude, longitude, banking, bonus, bike_stands) " +
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"VALUES(?, ?, ?, ?, ?, ?, ?, ?)",
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new_stations
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)
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# Insert the current state in the db
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logging.info('Storing current stations stats in db...')
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c.executemany(
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"INSERT INTO " +
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"stationsstats(station_id, available_bikes, available_ebikes, free_stands, status, updated) " +
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"VALUES(?, ?, ?, ?, ?, ?)",
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stats
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)
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conn.commit()
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def main():
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