Add renderer test cases

In the future, I would like to improve the way we handle some of the
rendering, so the first step is to ensure we have some proper test cases
to check for when rendering changes.

Most of this is updates for test cases, but also add a minor new route
as part of a future cleanup of the public api routes.

promgen/fixtures/testcases.yaml

@@ -57,3 +57,9 @@
     service: 1
     shard: 1
     farm: 1
+- model: promgen.exporter
+  pk: 1
+  fields:
+    project: 1
+    job: node
+    port: 9100

promgen/rest.py

@@ -32,6 +32,13 @@ def rules(self, request):
             headers={"Content-Disposition": "attachment; filename=alert.rule.yml"},
         )
 
+    @action(detail=False, methods=["get"], renderer_classes=[renderers.renderers.JSONRenderer])
+    def targets(self, request):
+        return HttpResponse(
+            prometheus.render_config(),
+            content_type="application/json",
+        )
+
 
 class ShardViewSet(viewsets.ModelViewSet):
     queryset = models.Shard.objects.all()

promgen/templates/promgen/navbar.html

@@ -36,7 +36,7 @@
                         <li><a href="{% url 'api:api-root' %}">API</a></li>
                         <li><a href="{% url 'config-targets' %}">Export Targets</a></li>
                         <li><a href="{% url 'api:all-rules' %}">Export Rules</a></li>
-                        <li><a href="{% url 'config-urls' %}">Export URL</a></li>
+                        <li><a href="{% url 'api:all-targets' %}">Export URL</a></li>
                     </ul>
                 </li>
                 {% include 'promgen/help_menu.inc.html' %}

promgen/tests/examples/export.rule.yml

@@ -0,0 +1,11 @@
+groups:
+  - name: promgen.example.com
+    rules:
+      - alert: example-rule
+        annotations:
+          rule: http://promgen.example.com/rule/1
+          summary: Example rule summary
+        expr: up==1
+        for: 1s
+        labels:
+          severity: high

promgen/tests/examples/export.targets.json

@@ -0,0 +1,16 @@
+[
+    {
+      "labels": {
+        "__farm_source": "promgen",
+        "__scheme__": "http",
+        "__shard": "test-shard",
+        "farm": "test-farm",
+        "job": "node",
+        "project": "test-project",
+        "service": "test-service"
+      },
+      "targets": [
+        "example.com:9100"
+      ]
+    }
+  ]

promgen/tests/test_cli.py

@@ -22,15 +22,15 @@ def test_register_job(self, mock_signal):
         management.call_command("register-job", "test-project", "example", 1234)
 
         # Ensure the jobs we expect exist
-        self.assertCount(models.Exporter, 1)
+        self.assertCount(models.Exporter, 2, "Import a new exporter")
 
         # Registering the same job again shouldn't change our count
         management.call_command("register-job", "test-project", "example", 1234)
-        self.assertCount(models.Exporter, 1)
+        self.assertCount(models.Exporter, 2, "Import additional exporter")
 
         # But registering a new one will
         management.call_command("register-job", "test-project", "example", 4321)
-        self.assertCount(models.Exporter, 2)
+        self.assertCount(models.Exporter, 3, 'Import additional exporter')
 
     @mock.patch("promgen.signals._trigger_write_config")
     def test_register_host(self, mock_signal):

promgen/tests/test_renderers.py

@@ -0,0 +1,25 @@
+# Copyright (c) 2024 LINE Corporation
+# These sources are released under the terms of the MIT license: see LICENSE
+
+from django.urls import reverse
+from yaml import safe_load
+
+from promgen import tests
+
+
+class RendererTests(tests.PromgenTest):
+    fixtures = ["testcases.yaml", "extras.yaml"]
+
+    def test_global_rule(self):
+        expected = tests.Data("examples", "export.rule.yml").yaml()
+        response = self.client.get(reverse("api:all-rules"))
+        self.assertEqual(response.status_code, 200)
+        # The test client does not have a shortcut to decode yaml
+        data = safe_load(response.content)
+        self.assertEqual(data, expected)
+
+    def test_global_targets(self):
+        expected = tests.Data("examples", "export.targets.json").json()
+        response = self.client.get(reverse("api:all-targets"))
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.json(), expected)

promgen/tests/test_routes.py

@@ -30,7 +30,7 @@ def test_import(self, mock_write, mock_reload):
         self.assertRoute(response, views.Import, 302, "Redirect to imported object")
         self.assertCount(models.Service, 3, "Import one service (Fixture has two services)")
         self.assertCount(models.Project, 4, "Import two projects")
-        self.assertCount(models.Exporter, 2, "Import two exporters")
+        self.assertCount(models.Exporter, 3, "Import two more exporters")
         self.assertCount(models.Host, 3, "Import three hosts")
 
     @override_settings(PROMGEN=TEST_SETTINGS)
@@ -50,7 +50,7 @@ def test_replace(self, mock_write, mock_reload):
 
         self.assertCount(models.Service, 3, "Import one service (Fixture has two services)")
         self.assertCount(models.Project, 4, "Import two projects (Fixture has 2 projectsa)")
-        self.assertCount(models.Exporter, 2, "Import two exporters")
+        self.assertCount(models.Exporter, 3, "Import two more exporters")
         self.assertCount(
             models.Farm, 4, "Original two farms and one new farm (fixture has one farm)"
         )