Add support for persisting webapp data

stack_orchestrator/data/compose/docker-compose-webapp-template-persistent.yml

@@ -0,0 +1,13 @@
+services:
+  webapp:
+    image: cerc/webapp-container:local
+    restart: always
+    environment:
+      CERC_SCRIPT_DEBUG: ${CERC_SCRIPT_DEBUG}
+    ports:
+      - "80"
+    volumes:
+      - app-data:/data
+
+volumes:
+  app-data:

stack_orchestrator/data/stacks/webapp-template-persistent/stack.yml

@@ -0,0 +1,7 @@
+version: "1.0"
+name: webapp-template-persistent
+description: "Same as webapp-template stack, but with persistent data"
+containers:
+  - cerc/webapp-template-container
+pods:
+  - webapp-template-persistent

stack_orchestrator/deploy/webapp/deploy_webapp.py

@@ -25,9 +25,9 @@ from stack_orchestrator.deploy.deploy import create_deploy_context
 from stack_orchestrator.deploy.deploy_types import DeployCommandContext
 
 
-def _fixup_container_tag(deployment_dir: str, image: str):
+def _fixup_container_tag(deployment_dir: str, pod_name: str, image: str):
     deployment_dir_path = Path(deployment_dir)
-    compose_file = deployment_dir_path.joinpath("compose", "docker-compose-webapp-template.yml")
+    compose_file = deployment_dir_path.joinpath("compose", pod_name)
     # replace "cerc/webapp-container:local" in the file with our image tag
     with open(compose_file) as rfile:
         contents = rfile.read()
@@ -54,7 +54,7 @@ def _fixup_url_spec(spec_file_name: str, url: str):
         wfile.write(contents)
 
 
-def create_deployment(ctx, deployment_dir, image, url, kube_config, image_registry, env_file):
+def create_deployment(ctx, deployment_dir, image, url, kube_config, image_registry, env_file, persist_data=False):
     # Do the equivalent of:
     # 1. laconic-so --stack webapp-template deploy --deploy-to k8s init --output webapp-spec.yml
     #   --config (eqivalent of the contents of my-config.env)
@@ -70,6 +70,10 @@ def create_deployment(ctx, deployment_dir, image, url, kube_config, image_regist
     spec_file_name = tf.name
     # Specify the webapp template stack
     stack = "webapp-template"
+    pod_file_name = "docker-compose-webapp-template.yml"
+    if persist_data:
+        stack = "webapp-template-persistent"
+        pod_file_name = "docker-compose-webapp-template-persistent.yml"
     # TODO: support env file
     deploy_command_context: DeployCommandContext = create_deploy_context(
         global_options2(ctx), None, stack, None, None, None, env_file, "k8s"
@@ -95,7 +99,7 @@ def create_deployment(ctx, deployment_dir, image, url, kube_config, image_regist
         None
     )
     # Fix up the container tag inside the deployment compose file
-    _fixup_container_tag(deployment_dir, image)
+    _fixup_container_tag(deployment_dir, pod_file_name, image)
     os.remove(spec_file_name)
 
 

stack_orchestrator/deploy/webapp/deploy_webapp_from_registry.py

@@ -137,10 +137,14 @@ def process_app_deployment_request(
             env.update(app_deployment_request.attributes.config.env)
 
     env_filename = None
+    persist_data = False
     if env:
         env_filename = tempfile.mktemp()
         with open(env_filename, "w") as file:
             for k, v in env.items():
+                if k == "__PERSISTENT_VOLUME__":
+                    persist_data = True if v == "true" else False
+                    continue
                 file.write("%s=%s\n" % (k, shlex.quote(str(v))))
 
     # 5. determine new or existing deployment
@@ -180,6 +184,7 @@ def process_app_deployment_request(
             kube_config,
             image_registry,
             env_filename,
+            persist_data
         )
     elif env_filename:
         shutil.copyfile(env_filename, deployment_config_file)