Basic volume support (#622)

app/deploy/k8s/cluster_info.py

@@ -18,6 +18,7 @@ from typing import Any, List, Set
 
 from app.opts import opts
 from app.util import get_yaml
+from app.deploy.k8s.helpers import named_volumes_from_pod_files, volume_mounts_for_service, volumes_for_pod_files
 
 
 class ClusterInfo:
@@ -47,6 +48,28 @@ class ClusterInfo:
         if opts.o.debug:
             print(f"image_set: {self.image_set}")
 
+    def get_pvcs(self):
+        result = []
+        volumes = named_volumes_from_pod_files(self.parsed_pod_yaml_map)
+        if opts.o.debug:
+            print(f"Volumes: {volumes}")
+        for volume_name in volumes:
+            spec = client.V1PersistentVolumeClaimSpec(
+                storage_class_name="standard",
+                access_modes=["ReadWriteOnce"],
+                resources=client.V1ResourceRequirements(
+                    requests={"storage": "2Gi"}
+                )
+            )
+            pvc = client.V1PersistentVolumeClaim(
+                metadata=client.V1ObjectMeta(name=volume_name,
+                                             labels={"volume-label": volume_name}),
+                spec=spec,
+            )
+            result.append(pvc)
+        return result
+
+    # to suit the deployment, and also annotate the container specs to point at said volumes
     def get_deployment(self):
         containers = []
         for pod_name in self.parsed_pod_yaml_map:
@@ -56,19 +79,22 @@ class ClusterInfo:
                 container_name = service_name
                 service_info = services[service_name]
                 image = service_info["image"]
+                volume_mounts = volume_mounts_for_service(self.parsed_pod_yaml_map, service_name)
                 container = client.V1Container(
                     name=container_name,
                     image=image,
                     ports=[client.V1ContainerPort(container_port=80)],
+                    volume_mounts=volume_mounts,
                     resources=client.V1ResourceRequirements(
                         requests={"cpu": "100m", "memory": "200Mi"},
                         limits={"cpu": "500m", "memory": "500Mi"},
                     ),
                 )
                 containers.append(container)
+        volumes = volumes_for_pod_files(self.parsed_pod_yaml_map)
         template = client.V1PodTemplateSpec(
             metadata=client.V1ObjectMeta(labels={"app": self.app_name}),
-            spec=client.V1PodSpec(containers=containers),
+            spec=client.V1PodSpec(containers=containers, volumes=volumes),
         )
         spec = client.V1DeploymentSpec(
             replicas=1, template=template, selector={

app/deploy/k8s/deploy_k8s.py

@@ -26,6 +26,7 @@ class K8sDeployer(Deployer):
     name: str = "k8s"
     core_api: client.CoreV1Api
     apps_api: client.AppsV1Api
+    k8s_namespace: str = "default"
     kind_cluster_name: str
     cluster_info : ClusterInfo
 
@@ -49,17 +50,27 @@ class K8sDeployer(Deployer):
         self.connect_api()
         # Ensure the referenced containers are copied into kind
         load_images_into_kind(self.kind_cluster_name, self.cluster_info.image_set)
+        # Figure out the PVCs for this deployment
+        pvcs = self.cluster_info.get_pvcs()
+        for pvc in pvcs:
+            if opts.o.debug:
+                print(f"Sending this: {pvc}")
+            pvc_resp = self.core_api.create_namespaced_persistent_volume_claim(body=pvc, namespace=self.k8s_namespace)
+            if opts.o.debug:
+                print("PVCs created:")
+                print(f"{pvc_resp}")
         # Process compose files into a Deployment
         deployment = self.cluster_info.get_deployment()
         # Create the k8s objects
-        resp = self.apps_api.create_namespaced_deployment(
-            body=deployment, namespace="default"
-        )
-
         if opts.o.debug:
-            print("Deployment created.\n")
+            print(f"Sending this: {deployment}")
-            print(f"{resp.metadata.namespace} {resp.metadata.name} \
+        deployment_resp = self.apps_api.create_namespaced_deployment(
-                  {resp.metadata.generation} {resp.spec.template.spec.containers[0].image}")
+            body=deployment, namespace=self.k8s_namespace
+        )
+        if opts.o.debug:
+            print("Deployment created:")
+            print(f"{deployment_resp.metadata.namespace} {deployment_resp.metadata.name} \
+                  {deployment_resp.metadata.generation} {deployment_resp.spec.template.spec.containers[0].image}")
 
     def down(self, timeout, volumes):
         # Delete the k8s objects

app/deploy/k8s/helpers.py

@@ -55,3 +55,50 @@ def pods_in_deployment(core_api: client.CoreV1Api, deployment_name: str):
 def log_stream_from_string(s: str):
     # Note response has to be UTF-8 encoded because the caller expects to decode it
     yield ("ignore", s.encode())
+
+
+def named_volumes_from_pod_files(parsed_pod_files):
+    # Parse the compose files looking for named volumes
+    named_volumes = []
+    for pod in parsed_pod_files:
+        parsed_pod_file = parsed_pod_files[pod]
+        if "volumes" in parsed_pod_file:
+            volumes = parsed_pod_file["volumes"]
+            for volume in volumes.keys():
+                # Volume definition looks like:
+                # 'laconicd-data': None
+                named_volumes.append(volume)
+    return named_volumes
+
+
+def volume_mounts_for_service(parsed_pod_files, service):
+    result = []
+    # Find the service
+    for pod in parsed_pod_files:
+        parsed_pod_file = parsed_pod_files[pod]
+        if "services" in parsed_pod_file:
+            services = parsed_pod_file["services"]
+            for service_name in services:
+                if service_name == service:
+                    service_obj = services[service_name]
+                    if "volumes" in service_obj:
+                        volumes = service_obj["volumes"]
+                        for mount_string in volumes:
+                            # Looks like: test-data:/data
+                            (volume_name, mount_path) = mount_string.split(":")
+                            volume_device = client.V1VolumeMount(mount_path=mount_path, name=volume_name)
+                            result.append(volume_device)
+    return result
+
+
+def volumes_for_pod_files(parsed_pod_files):
+    result = []
+    for pod in parsed_pod_files:
+        parsed_pod_file = parsed_pod_files[pod]
+        if "volumes" in parsed_pod_file:
+            volumes = parsed_pod_file["volumes"]
+            for volume_name in volumes.keys():
+                claim = client.V1PersistentVolumeClaimVolumeSource(claim_name=volume_name)
+                volume = client.V1Volume(name=volume_name, persistent_volume_claim=claim)
+                result.append(volume)
+    return result