slowtiles module

This adds a module to keep trak of slow to generate tiles
The tileserver can get the list and pregenerate them

Author: Akasch

requirements.txt

@@ -0,0 +1,3 @@
+django
+mercantile
+geojson

tileservermapping/slowtiles/admin.py

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+from django.contrib import admin
+
+# Register your models here.
+from .models import SlowTiles
+
+admin.site.register(SlowTiles)

tileservermapping/slowtiles/migrations/0001_initial.py

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+# Generated by Django 2.2.1 on 2020-02-09 20:16
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('mapping', '0006_auto_20181226_1555'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SlowTiles',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('z', models.IntegerField()),
+                ('x', models.IntegerField()),
+                ('y', models.IntegerField()),
+                ('count', models.IntegerField(default=1)),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('updated', models.DateTimeField(auto_now=True)),
+                ('server', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='mapping.Server')),
+            ],
+            options={
+                'unique_together': {('z', 'x', 'y')},
+            },
+        ),
+    ]

tileservermapping/slowtiles/migrations/__init__.py

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+from django.db import models, transaction
+from tileservermapping.mapping.models import Server
+
+
+class SlowTiles(models.Model):
+    z = models.IntegerField(null=False)
+    x = models.IntegerField(null=False)
+    y = models.IntegerField(null=False)
+
+    server = models.ForeignKey(Server, on_delete=models.CASCADE)
+
+    count = models.IntegerField(default=1)
+    created = models.DateTimeField(auto_now_add=True)
+    updated = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        unique_together = ['z', 'x', 'y']
+        
+    def __str__(self):
+        return "<SlowTile: {}/{}/{} c: {}>".format(self.z, self.x, self.y, self.count)
+
+    @staticmethod
+    def insert(z, x, y):
+        """
+        inserts a tile z/x/y into the slow tile list, or increase the counter on an existing tile
+        :return: the current counter on this tile, or -1 if no tile server is responsible
+        """
+        server = Server.get_server(z, x, y)
+        if server == Server.objects.get(z=0, x=0, y=0):
+            # we can not do anything on the external instance
+            return -1
+        with transaction.atomic():
+            try:
+                tile = SlowTiles.objects.get(z=z, x=x, y=y)
+                tile.count += 1
+            except models.ObjectDoesNotExist:
+                tile = SlowTiles(z=z, x=x, y=y, server=server)
+            tile.save()
+        return tile.count

tileservermapping/slowtiles/models.py

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+from django.urls import path
+from .views import insert_tile, get_server_list
+
+urlpatterns = [
+    path('add/<int:z>/<int:x>/<int:y>', insert_tile, name="insert_tile"),
+    path('server_list/<int:z>/<int:x>/<int:y>', get_server_list, name="server_list")
+]

tileservermapping/slowtiles/urls.py

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+from django.http import HttpResponse
+
+from tileservermapping.mapping.models import Server
+from tileservermapping.slowtiles.models import SlowTiles
+
+
+def insert_tile(request, z, x, y):
+    tile_count = SlowTiles.insert(z, x, y)
+    if tile_count < 0:
+        return HttpResponse("No server responsible", content_type='text', status=404)
+    return HttpResponse("Added: {}/{}/{} Count: {}".format(z, x, y, tile_count), content_type='text')
+
+
+def get_server_list(request, z, x, y):
+    server = Server.get_server(z, x, y)
+    tiles = SlowTiles.objects.filter(server=server, count__gte=5)
+    answer = ""
+    for tile in tiles:
+        answer += "{}/{}/{}\n".format(tile.z, tile.x, tile.y)
+    return HttpResponse(answer, content_type='text')

tileservermapping/slowtiles/views.py

@@ -20,4 +20,5 @@
 urlpatterns = [
     path('admin/', admin.site.urls),
     url(r'^mappings/', include('tileservermapping.mapping.urls')),
+    path('slow_tiles/', include('tileservermapping.slowtiles.urls')),
 ]