Add diagrams test

catch-all/07_diagrams_as_code/07_web_onpremise.py

@@ -0,0 +1,39 @@
+#! /usr/bin/env python
+
+from diagrams import Cluster, Diagram
+from diagrams.onprem.analytics import Spark
+from diagrams.onprem.compute import Server
+from diagrams.onprem.database import PostgreSQL
+from diagrams.onprem.inmemory import Redis
+from diagrams.onprem.aggregator import Fluentd
+from diagrams.onprem.monitoring import Grafana, Prometheus
+from diagrams.onprem.network import Nginx
+from diagrams.onprem.queue import Kafka
+
+with Diagram("Advanced Web Service with On-Premise", show=False):
+    ingress = Nginx("ingress")
+
+    metrics = Prometheus("metric")
+    metrics << Grafana("monitoring")
+
+    with Cluster("Service Cluster"):
+        grpcsvc = [
+            Server("grpc1"),
+            Server("grpc2"),
+            Server("grpc3")
+        ]
+
+    with Cluster("Sessions HA"):
+        primary = Redis("session")
+        primary - Redis("replica") << metrics
+        grpcsvc >> primary
+
+    with Cluster("Database HA"):
+        primary = PostgreSQL("users")
+        primary - PostgreSQL("replica") << metrics
+        grpcsvc >> primary
+
+    aggregator = Fluentd("logging")
+    aggregator >> Kafka("stream") >> Spark("analytics")
+
+    ingress >> grpcsvc >> aggregator