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run_server.py
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run_server.py
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import flask
import sys
import json
import pymysql
import pymysql.cursors
import utils
#
# CONFIG
#
# create an app
app = flask.Flask(__name__)
# read all the default arguments
if "--help" in sys.argv[1:]:
print(
"""Reads in SBB CSV files and imports them into an SQL database.
Usage: {} [HOST [USER [DATABASE [PASSWORD]]]]
""".format(
sys.argv[0]
)
)
sys.exit(1)
# read all of the arguments
host = utils.read_or_ask(1, "SQL Hostname>")
username = utils.read_or_ask(2, "Username for {}>".format(host))
database = utils.read_or_ask(3, "Database Name>")
password = utils.read_or_ask(4, "Password for {} ({}@{})>".format(database, username, host), True)
# connect to the db
db = pymysql.connect(
host=host, user=username, password=password, db=database, charset="utf8mb4", cursorclass=pymysql.cursors.DictCursor
)
#
# ROUTES
#
@app.route("/", methods=["GET"])
def index() -> str:
"""Renders the homepage."""
return flask.render_template("index.html")
@app.route("/style.css", methods=["GET"])
def style() -> str:
"""Renders the stylesheet."""
return flask.render_template("style.css")
@app.route("/stop.json", methods=["GET"])
def stop() -> str:
"""Renders status information for a stop."""
# Check that we have an 'id' parameter
sid = flask.request.args.get("id")
if sid is None:
return stop_error("Missing required parameter 'id'. ")
# Make sure it is an int.
try:
sid = str(int(sid))
except:
return stop_error("Invalid value for parameter id. ")
# Make a request for things.
QUERY_ALL = "SELECT COUNT(*) FROM SbbData WHERE stop_id={}".format(sid)
QUERY_LATE = "SELECT COUNT(*), AVG(TIME_TO_SEC(dep_time) - TIME_TO_SEC(dep_est)) FROM SbbData WHERE stop_id={} AND ((arr_time != arr_est) OR (dep_time != dep_est) OR trip_canc OR train_skip)".format(
sid
)
QUERY_DELAYS = "SELECT TIME_TO_SEC(dep_time), TIME_TO_SEC(dep_time) - TIME_TO_SEC(dep_est) FROM SbbData WHERE stop_id={} AND ((arr_time != arr_est) OR (dep_time != dep_est) OR trip_canc OR train_skip)".format(
sid
)
with db.cursor() as cursor:
cursor.execute(QUERY_ALL)
count_all = cursor.fetchone()
with db.cursor() as cursor:
cursor.execute(QUERY_LATE)
count_late = cursor.fetchone()
with db.cursor() as cursor:
cursor.execute(QUERY_DELAYS)
count_delays = cursor.fetchall()
count_delays = [["time", "delay"]] + list(
filter(
lambda q: q[1] != None and q[1] < 500 and q[1] > 0,
map(
lambda r: [r["TIME_TO_SEC(dep_time)"], r["TIME_TO_SEC(dep_time) - TIME_TO_SEC(dep_est)"]], count_delays
),
)
)
# render the result.
return flask.render_template(
"stop/stop.json",
id=sid,
all=count_all["COUNT(*)"],
late=count_late["COUNT(*)"],
delay=count_late["AVG(TIME_TO_SEC(dep_time) - TIME_TO_SEC(dep_est))"],
delays=json.dumps(count_delays),
)
def stop_error(message: str):
"""Renders an error request for the /stop.json route.
:param message: Error message to show.
"""
return flask.render_template("stop/error.json", message=message)
#
# RUNNING
#
if __name__ == "__main__":
app.run()