Add NG-UI Charm

[osm/devops.git] / installers / charm / ng-ui / src / charm.py

diff --git a/installers/charm/ng-ui/src/charm.py b/installers/charm/ng-ui/src/charm.py
new file mode 100755 (executable)
index 0000000..23d3161
--- /dev/null
+++ b/installers/charm/ng-ui/src/charm.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+#   Copyright 2020 Canonical Ltd.
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+import sys
+import logging
+
+sys.path.append("lib")
+
+from ops.charm import CharmBase
+from ops.framework import StoredState, Object
+from ops.main import main
+from ops.model import (
+    ActiveStatus,
+    MaintenanceStatus,
+)
+
+from glob import glob
+from pathlib import Path
+from string import Template
+
+logger = logging.getLogger(__name__)
+
+
+class NGUICharm(CharmBase):
+    state = StoredState()
+
+    def __init__(self, framework, key):
+        super().__init__(framework, key)
+        self.state.set_default(spec=None)
+
+        # Observe Charm related events
+        self.framework.observe(self.on.config_changed, self.on_config_changed)
+        self.framework.observe(self.on.start, self.on_start)
+        self.framework.observe(self.on.upgrade_charm, self.on_upgrade_charm)
+        # self.framework.observe(
+        #     self.on.nbi_relation_joined, self.on_nbi_relation_joined
+        # )
+
+    def _apply_spec(self):
+        # Only apply the spec if this unit is a leader.
+        if not self.framework.model.unit.is_leader():
+            return
+        new_spec = self.make_pod_spec()
+        if new_spec == self.state.spec:
+            return
+        self.framework.model.pod.set_spec(new_spec)
+        self.state.spec = new_spec
+
+    def make_pod_spec(self):
+        config = self.framework.model.config
+
+        ports = [
+            {"name": "port", "containerPort": config["port"], "protocol": "TCP",},
+        ]
+
+        kubernetes = {
+            "readinessProbe": {
+                "tcpSocket": {"port": config["port"]},
+                "timeoutSeconds": 5,
+                "periodSeconds": 5,
+                "initialDelaySeconds": 10,
+            },
+            "livenessProbe": {
+                "tcpSocket": {"port": config["port"]},
+                "timeoutSeconds": 5,
+                "initialDelaySeconds": 45,
+            },
+        }
+        config_spec = {
+            "port": config["port"],
+            "server_name": config["server_name"],
+            "client_max_body_size": config["client_max_body_size"],
+            "nbi_hostname": config["nbi_hostname"],
+            "nbi_port": config["nbi_port"],
+        }
+
+        files = [
+            {
+                "name": "configuration",
+                "mountPath": "/etc/nginx/sites-available/",
+                "files": {
+                    Path(filename)
+                    .name: Template(Path(filename).read_text())
+                    .substitute(config_spec)
+                    for filename in glob("files/*")
+                },
+            },
+        ]
+        logger.debug(files)
+        spec = {
+            "version": 2,
+            "containers": [
+                {
+                    "name": self.framework.model.app.name,
+                    "image": "{}".format(config["image"]),
+                    "ports": ports,
+                    "kubernetes": kubernetes,
+                    "files": files,
+                }
+            ],
+        }
+
+        return spec
+
+    def on_config_changed(self, event):
+        """Handle changes in configuration"""
+        unit = self.model.unit
+        unit.status = MaintenanceStatus("Applying new pod spec")
+        self._apply_spec()
+        unit.status = ActiveStatus("Ready")
+
+    def on_start(self, event):
+        """Called when the charm is being installed"""
+        unit = self.model.unit
+        unit.status = MaintenanceStatus("Applying pod spec")
+        self._apply_spec()
+        unit.status = ActiveStatus("Ready")
+
+    def on_upgrade_charm(self, event):
+        """Upgrade the charm."""
+        unit = self.model.unit
+        unit.status = MaintenanceStatus("Upgrading charm")
+        self.on_start(event)
+
+    # def on_nbi_relation_joined(self, event):
+    #     unit = self.model.unit
+    #     if not unit.is_leader():
+    #         return
+    #     config = self.framework.model.config
+    #     unit = MaintenanceStatus("Sending connection data")
+
+    #     unit = ActiveStatus("Ready")
+
+
+if __name__ == "__main__":
+    main(NGUICharm)