Add ingress to the charm

src/charm.py

@@ -8,6 +8,11 @@ import logging
 import time
 
 import ops
+from charms.traefik_k8s.v2.ingress import (
+    IngressPerAppReadyEvent,
+    IngressPerAppRequirer,
+    IngressPerAppRevokedEvent,
+)
 
 # A standalone module for workload-specific logic (no charming concerns):
 import charmed_server
@@ -24,6 +29,16 @@ class CharmedServerCharm(ops.CharmBase):
         framework.observe(self.on.start, self._on_start)
         framework.observe(self.on.config_changed, self._on_config_changed)
 
+        self.ingress = IngressPerAppRequirer(self, port=80)
+        framework.observe(self.ingress.on.ready, self._on_ingress_ready)
+        framework.observe(self.ingress.on.revoked, self._on_ingress_revoked)
+
+    def _on_ingress_ready(self, event: IngressPerAppReadyEvent):
+        logger.info("This app's ingress URL: %s", event.url)
+
+    def _on_ingress_revoked(self, event: IngressPerAppRevokedEvent):
+        logger.info("This app no longer has ingress")
+
     def _on_install(self, event: ops.InstallEvent):
         """Install the workload on the machine."""
         charmed_server.install()