Integration with a SQL database, human-readable output of departures

monitor.py

@@ -6,6 +6,23 @@ from pprint import pprint, pformat
 import datetime
 import pause
 import sys
+import mysql.connector
+
+TABLE = """
+CREATE TABLE IF NOT EXISTS vrr (
+line_code varchar(9) not null,
+direction_code varchar(1) not null,
+station_id int not null,
+orig_datetime datetime not null,
+status enum('on_time', 'early', 'late', 'cancelled', 'no_data') not null,
+delay_value int default null,
+primary key (line_code, direction_code, station_id, orig_datetime));
+"""
+
+# CONFIGURATION
+USE_MODES = []
+USE_STATION_ID = 20021002
+USE_LINES = []
 
 
 class MOT:
@@ -30,16 +47,8 @@ lines_filter = [
 ]
 
 
-def t(s: str) -> str:
-    """
-    Encode a string to be used as a station identifier.
-    :param s: a string to encode
-    :return: the encoded string
-    """
-    return s.replace(' ', '+')
-
-
-def make_request_data(station_id: int, result_count: int = 8, modes: List = MOT.ALL_MODES, lines: List[str] = ALL_LINES) -> dict:
+def make_request_data(station_id: int, result_count: int = 8, modes: List = MOT.ALL_MODES,
+                      lines: List[str] = ALL_LINES) -> dict:
     """
     Prepare a request data dictionary to put into get_data()
     :param station_id: an EFA station ID
@@ -81,7 +90,7 @@ def make_request_data(station_id: int, result_count: int = 8, modes: List = MOT.
     if lines is ALL_LINES:
         request_data['useAllLines'] = 1
     else:
-        lines_dictarr = [{'data': t(v)} for v in lines]
+        lines_dictarr = [{'data': v.replace(' ', '+')} for v in lines]
         request_data['linesFilter'] = json.dumps(lines_dictarr)
         request_data['useAllLines'] = 0
 
@@ -116,9 +125,12 @@ def is_early(trip: dict) -> bool:
     return False
 
 
-# Pretty-print the reply data.
-"""print("Data:")
-pprint(reply_data)"""
+def is_on_time(trip: dict) -> bool:
+    return int(trip['delay']) == 0
+
+
+def has_realtime(trip: dict) -> bool:
+    return trip['delay'] != ''
 
 
 def fixup_data(d: dict) -> dict:
@@ -129,13 +141,20 @@ def fixup_data(d: dict) -> dict:
 
 
 def print_trip(trip: dict) -> None:
-    trip_part = "The {}:{} {} (???:{}: :{}) service to {} ".format(trip['orgHour'], trip['orgMinute'], trip['lineNumber'], trip['lineCode'], trip['directionCode'], trip['direction'])
+    trip_part = "The {}:{} {} (???:{}: :{}) service to {} ".format(trip['orgHour'], trip['orgMinute'],
+                                                                   trip['lineNumber'], trip['lineCode'],
+                                                                   trip['directionCode'], trip['direction'])
+    if has_realtime(trip):
         if is_cancelled(trip):
             print(trip_part + "is cancelled.")
         elif is_late(trip):
             print(trip_part + "is {} minutes late.".format(trip['delay']))
         elif is_early(trip):
             print(trip_part + "is {} minutes early.".format(-trip['delay']))
+        elif is_on_time(trip):
+            print(trip_part + "is on time.")
+    else:
+        print(trip_part + "has no real-time data.")
 
 
 def get_next_refresh(data: dict):
@@ -153,31 +172,74 @@ def get_next_refresh(data: dict):
     return (datetime.datetime.now() + datetime.timedelta(seconds=60)).timestamp()
 
 
-def update():
+def _make_delay_value_for_sql(value: str or int or None) -> int or None:
+    if value == '':
+        value = None
+    else:
+        value = int(value)
+    return value
+
+
+def _make_status_value_for_sql(trip: dict) -> str:
+    if not has_realtime(trip):
+        status = 'no_data'
+    else:
+        if is_late(trip):
+            status = 'late'
+        elif is_cancelled(trip):
+            status = 'cancelled'
+        elif is_early(trip):
+            status = 'early'
+        elif is_on_time(trip):
+            status = 'on_time'
+        else:
+            raise ValueError("unknown delay value")
+    return status
+
+
+def update(station_id: int):
     reply_data = get_data(
         make_request_data(
-            20021002,
+            station_id,
             8,
             lines=lines_filter
         )
     )
-    reply_data = fixup_data(reply_data)
     for trip in reply_data['departureData']:
         print_trip(trip)
     return reply_data
 
 
-def wait():
-    data = update()
+def wait(cxn: mysql.connector.MySQLConnection, station_id: int):
+    lines_filter = [
+        'rbg:70070: :H',  # U70 -> Düsseldorf Hbf
+        'rbg:70070: :R',  # U70 -> Krefeld Rheinstr
+        'rbg:70076: :H',  # U76 -> Düsseldorf Hbf
+        'rbg:70076: :R',  # U76 -> Krefeld Rheinstr
+    ]
+    cur = cxn.cursor()
     while True:
+        data = update(station_id)
+        for t in data['departureData']:
+            cur.execute('REPLACE INTO vrr '
+                        '(line_code, direction_code, station_id, orig_datetime, status, delay_value)'
+                        ' VALUES (%s, %s, %s, '
+                        'from_unixtime(%s), %s, %s)',
+                        (t['lineCode'], t['directionCode'], station_id,
+                         t['orgFullTime'], _make_status_value_for_sql(t), _make_delay_value_for_sql(t['delay'])
+                        ))
+        cxn.commit()
         next_refresh = get_next_refresh(data)
         print("Sleeping until " + datetime.datetime.fromtimestamp(next_refresh).isoformat(), file=sys.stderr)
         pause.until(next_refresh)
-        data = update()
 
 
 def main():
-    wait()
+    cxn = mysql.connector.connect(user='vrr', password='vrr', host='127.0.0.1', database='vrr')
+    cursor = cxn.cursor()
+    cursor.execute(TABLE)
+
+    wait(cxn, USE_STATION_ID)
 
 
 main()

requirements.txt

@@ -1,2 +1,3 @@
 requests
 pause
+mysql-connector-python