make large badge number human readable

Signed-off-by: Julien Flawinne <jf.satnogs at protonmail dot com>

db/base/utils.py

@@ -1,7 +1,9 @@
 """Miscellaneous functions for SatNOGS DB"""
 import binascii
 import logging
+import math
 from datetime import datetime, timedelta
+from decimal import Decimal
 
 from django.conf import settings
 from django.core.cache import cache
@@ -318,3 +320,25 @@ def cache_statistics():
                                    latest_payload=Max('timestamp')) \
                          .order_by('-count')
     cache.set('stats_observers', observers, 60 * 60 * 2)
+
+
+def remove_exponent(converted_number):
+    """Remove exponent."""
+    return converted_number.quantize(
+        Decimal(1)
+    ) if converted_number == converted_number.to_integral() else converted_number.normalize()
+
+
+def millify(number, precision=0):
+    """Humanize number."""
+    millnames = ['', 'k', 'M', 'B', 'T', 'P', 'E', 'Z', 'Y']
+    number = float(number)
+    millidx = max(
+        0,
+        min(
+            len(millnames) - 1, int(math.floor(0 if number == 0 else math.log10(abs(number)) / 3))
+        )
+    )
+    result = '{:.{precision}f}'.format(number / 10**(3 * millidx), precision=precision)
+    result = remove_exponent(Decimal(result))
+    return '{0}{dx}'.format(result, dx=millnames[millidx])

db/base/views.py

@@ -26,7 +26,7 @@ from db.base.models import SERVICE_TYPE, TRANSMITTER_STATUS, \
     TRANSMITTER_TYPE, DemodData, Mode, Satellite, Transmitter, \
     TransmitterEntry, TransmitterSuggestion
 from db.base.tasks import export_frames
-from db.base.utils import cache_statistics
+from db.base.utils import cache_statistics, millify
 
 LOGGER = logging.getLogger('db')
 
@@ -183,7 +183,8 @@ def satellite(request, norad):
             'latest_frame': latest_frame,
             'frame_count': frame_count,
             'mapbox_token': settings.MAPBOX_TOKEN,
-            'recent_observers': recent_observers
+            'recent_observers': recent_observers,
+            'badge_telemetry_count': millify(satellite_obj.telemetry_data_count)
         }
     )
 

db/templates/base/satellite.html

@@ -56,7 +56,7 @@
         aria-selected="false">
         <i class="nav-icon fas fa-chart-bar"></i>
         {% if satellite.telemetry_data_count %}
-        <span class="badge badge-satnogs-primary navbar-badge">{{ satellite.telemetry_data_count }}</span>
+        <span class="badge badge-satnogs-primary navbar-badge">{{ badge_telemetry_count }}</span>
         {% endif %}
         <p class="d-none d-lg-inline-block">Data</p>
       </a>