Add OSM charms

[osm/devops.git] / installers / charm / pol-k8s / reactive / pol_k8s.py

diff --git a/installers/charm/pol-k8s/reactive/pol_k8s.py b/installers/charm/pol-k8s/reactive/pol_k8s.py
new file mode 100644 (file)
index 0000000..c31a323
--- /dev/null
+++ b/installers/charm/pol-k8s/reactive/pol_k8s.py
@@ -0,0 +1,101 @@
+# 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.
+from charms.reactive import endpoint_from_flag
+from charms.layer.caas_base import pod_spec_set
+from charms.reactive import when, when_not, hook
+from charms.reactive.flags import set_flag, clear_flag
+from charmhelpers.core.hookenv import log, metadata, config
+from charms import layer
+
+
+@hook("upgrade-charm")
+@when("leadership.is_leader")
+def upgrade():
+    clear_flag("pol-k8s.configured")
+
+
+@when("config.changed")
+@when("leadership.is_leader")
+def restart():
+    clear_flag("pol-k8s.configured")
+
+
+@when_not("kafka.ready")
+@when_not("pol-k8s.configured")
+def waiting_for_kafka():
+    layer.status.waiting("Waiting for kafka to be ready")
+
+
+@when_not("mongo.ready")
+@when_not("pol-k8s.configured")
+def waiting_for_mongo():
+    layer.status.waiting("Waiting for mongo to be ready")
+
+
+@when("kafka.ready", "mongo.ready")
+@when_not("pol-k8s.configured")
+@when("leadership.is_leader")
+def configure():
+    layer.status.maintenance("Configuring pol container")
+    try:
+        kafka = endpoint_from_flag("kafka.ready")
+        mongo = endpoint_from_flag("mongo.ready")
+
+        if kafka and mongo:
+            kafka_units = kafka.kafkas()
+            kafka_unit = kafka_units[0]
+
+            mongo_uri = mongo.connection_string()
+            log("Mongo URI: {}".format(mongo_uri))
+
+            if mongo_uri and kafka_unit["host"]:
+                spec = make_pod_spec(kafka_unit["host"], kafka_unit["port"], mongo_uri)
+
+                log("set pod spec:\n{}".format(spec))
+                pod_spec_set(spec)
+                set_flag("pol-k8s.configured")
+    except Exception as e:
+        layer.status.blocked("k8s spec failed to deploy: {}".format(e))
+
+
+@when("pol-k8s.configured")
+def set_pol_active():
+    layer.status.active("ready")
+
+
+def make_pod_spec(kafka_host, kafka_port, mongo_uri):
+    """Make pod specification for Kubernetes
+
+    Args:
+        kafka_host (str): Kafka hostname or IP
+        kafka_port (int): Kafka port
+        mongo_host (str): Mongo URI
+    Returns:
+        pod_spec: Pod specification for Kubernetes
+    """
+
+    with open("reactive/spec_template.yaml") as spec_file:
+        pod_spec_template = spec_file.read()
+
+    md = metadata()
+    cfg = config()
+    data = {
+        "name": md.get("name"),
+        "docker_image": cfg.get("image"),
+        "kafka_host": kafka_host,
+        "kafka_port": kafka_port,
+        "mongo_uri": mongo_uri,
+    }
+    data.update(cfg)
+    return pod_spec_template % data