sombrero gains "Failure" model to record HTTP failures

kepi/sombrero_sendpub/migrations/0004_failure.py

@@ -0,0 +1,22 @@
+# Generated by Django 3.0.9 on 2020-10-18 22:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sombrero_sendpub', '0003_auto_20200730_2223'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Failure',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('url', models.URLField(max_length=256)),
+                ('status', models.IntegerField()),
+                ('found_at', models.DateTimeField(auto_now=True)),
+            ],
+        ),
+    ]

kepi/sombrero_sendpub/models.py

@@ -86,3 +86,28 @@ class WebfingerUser(models.Model):
 
     def __str__(self):
         return f'{self.username}@{self.hostname} -> {self.url}'
+
+class Failure(models.Model):
+
+    url = models.URLField(
+            max_length = 256,
+            )
+
+    status = models.IntegerField()
+
+    found_at = models.DateTimeField(
+            auto_now = True,
+            )
+
+    def save(self, *args, **kwargs):
+
+        if self.status//100 == 2:
+            raise ValueError(
+                    f"{self.url}: a result of {self.status} is "
+                    f"a success, not a failure!",
+                    )
+
+        super().save(*args, **kwargs)
+
+    def __str__(self):
+        return f'[{self.url} got {self.status}]'