Add OSM charms

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

diff --git a/installers/charm/ro-k8s/reactive/ro.py b/installers/charm/ro-k8s/reactive/ro.py
new file mode 100644 (file)
index 0000000..afd7f45
--- /dev/null
+++ b/installers/charm/ro-k8s/reactive/ro.py
@@ -0,0 +1,124 @@
+# 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.layer.caas_base import pod_spec_set
+from charms.reactive import endpoint_from_flag
+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
+from charms.osm.k8s import get_service_ip
+
+
+@hook("upgrade-charm")
+@when("leadership.is_leader")
+def upgrade():
+    clear_flag("ro-k8s.configured")
+
+
+@when("config.changed")
+@when("leadership.is_leader")
+def restart():
+    clear_flag("ro-k8s.configured")
+
+
+@when_not("mysql.available")
+@when_not("ro-k8s.configured")
+def waiting_for_mysql():
+    layer.status.waiting("Waiting for mysql to be ready")
+
+
+@when("mysql.available")
+@when_not("ro-k8s.configured")
+@when("leadership.is_leader")
+def configure():
+    layer.status.maintenance("Configuring ro container")
+    try:
+        mysql = endpoint_from_flag("mysql.available")
+
+        spec = make_pod_spec(
+            mysql.host(),
+            mysql.port(),
+            mysql.user(),
+            mysql.password(),
+            mysql.root_password(),
+        )
+
+        log("set pod spec:\n{}".format(spec))
+        pod_spec_set(spec)
+        layer.status.active("creating container")
+        set_flag("ro-k8s.configured")
+    except Exception as e:
+        layer.status.blocked("k8s spec failed to deploy: {}".format(e))
+
+
+@when("ro-k8s.configured")
+def set_ro_active():
+    layer.status.active("ready")
+
+
+@when("ro-k8s.configured", "ro.joined")
+def send_config():
+    layer.status.maintenance("Sending RO configuration")
+    try:
+        ro = endpoint_from_flag("ro.joined")
+        if ro:
+            service_ip = get_service_ip("ro")
+            if service_ip:
+                ro.send_connection(
+                    service_ip, get_ro_port(),
+                )
+                clear_flag("ro.joined")
+    except Exception as e:
+        log("Fail sending RO configuration: {}".format(e))
+
+
+def make_pod_spec(
+    mysql_host, mysql_port, mysql_user, mysql_password, mysql_root_password
+):
+    """Make pod specification for Kubernetes
+
+    Args:
+        mysql_name (str): RO DB name
+        mysql_host (str): RO DB host
+        mysql_port (int): RO DB port
+        mysql_user (str): RO DB user
+        mysql_password (str): RO DB password
+    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"),
+        "mysql_host": mysql_host,
+        "mysql_port": mysql_port,
+        "mysql_user": mysql_user,
+        "mysql_password": mysql_password,
+        "mysql_root_password": mysql_root_password,
+    }
+    data.update(cfg)
+
+    return pod_spec_template % data
+
+
+def get_ro_port():
+    """Returns RO port"""
+    cfg = config()
+    return cfg.get("advertised-port")