daily export three graphs with values from last three days

.gitignore

@@ -12,4 +12,5 @@ postgres.env
 *.ttf
 
 # dynamic files
-**/dyn/*.json
+**/dyn/*.json
+**/dyn/

backend/flask/app/graph.py

@@ -49,6 +49,47 @@ def create_current(config):
     print(message)
 
 
+def rebuild_3days(config):
+    """ wrapper to recreate all three days of graphs """
+    now = datetime.now()
+    # get axis
+    x_1, y_1, plt_title_1, x_ticks_1 = get_axis(1, now, config)
+    x_2, y_2, plt_title_2, x_ticks_2 = get_axis(2, now, config)
+    x_3, y_3, plt_title_3, x_ticks_3 = get_axis(3, now, config)
+    # set max
+    y_max = max(y_1.append(y_2).append(y_3)) + 50
+    # write plot
+    write_plt(x_1, y_1, plt_title_1, x_ticks_1, 'day-1', y_max)
+    write_plt(x_2, y_2, plt_title_2, x_ticks_2, 'day-2', y_max)
+    write_plt(x_3, y_3, plt_title_3, x_ticks_3, 'day-3', y_max)
+    print('recreaded last three days plt')
+
+
+def get_axis(day, now, config):
+    """ recreate plot for single days """
+    day_delta = now.date() - timedelta(days = day)
+    day_from = int(day_delta.strftime('%s'))
+    day_until = int(day_delta.strftime('%s')) + 60 * 60 * 24
+    # make the SELECT
+    conn, cur = db_connect(config)
+    cur.execute(
+        f'SELECT epoch_time, aqi_value FROM aqi \
+        WHERE epoch_time > {day_from} \
+        AND epoch_time < {day_until} \
+        ORDER BY epoch_time DESC LIMIT 720;'
+    )
+    rows = cur.fetchall()
+    db_close(conn, cur)
+    # title
+    time_stamp = day_delta.strftime('%Y-%m-%d')
+    plt_title = f'AQI values from: {time_stamp}'
+    # build plt
+    x_ticks = np.arange(0, 97, step=8)
+    sample_rate = '15min'
+    x, y = build_plt(rows, sample_rate)
+    return x, y, plt_title, x_ticks
+
+
 def build_plt(rows, sample_rate):
     """ parse rows returns axis"""
     # build x y
@@ -71,10 +112,11 @@ def build_plt(rows, sample_rate):
     return x, y
 
 
-def write_plt(x, y, plt_title, x_ticks, file_name):
+def write_plt(x, y, plt_title, x_ticks, file_name, y_max=''):
     """ save plot to file """
     # calc ticks
-    y_max = np.ceil(y.max()/50)*50 + 50
+    if not y_max:
+        y_max = np.ceil(y.max()/50)*50 + 50
     # setup plot
     plt.style.use('seaborn')
     plt.plot(x, y, color='#313131',)

backend/flask/app/views.py

@@ -38,6 +38,7 @@ auth = HTTPBasicAuth()
 config = get_config()
 weather.handle_weather(config)
 graph.create_current(config)
+graph.rebuild_3days(config)
 # build username / pw dict for basic auth
 USER_DATA = {}
 USER_DATA[config['authUsername']] = config['authPassword']
@@ -51,6 +52,9 @@ scheduler.add_job(
 scheduler.add_job(
     graph.create_current, args=[config], trigger="cron", minute='*/5', name='current_graph'
 )
+scheduler.add_job(
+    graph.rebuild_3days, args=[config], trigger="cron", day='*', hour='1', minute='3', name='3_days'
+)
 scheduler.start()