Switch to Kubernetes Watch API
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continuous-integration/drone Build is passing
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@ -32,13 +32,16 @@ spec:
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containers:
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- name: camdetect
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image: harbor.k-space.ee/k-space/camera-motion-detect:latest
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ports:
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- containerPort: 5000
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name: "http"
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resources:
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requests:
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memory: "64Mi"
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cpu: "250m"
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cpu: "200m"
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limits:
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memory: "128Mi"
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cpu: "500m"
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cpu: "1"
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securityContext:
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readOnlyRootFilesystem: true
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runAsNonRoot: true
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@ -1,100 +1,135 @@
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import asyncio
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import os
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import yaml
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from base64 import b64decode
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from kubernetes_asyncio.client.api_client import ApiClient
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from kubernetes_asyncio import client, config
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from kubernetes_asyncio import client, config, watch
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from os import path
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from time import time
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from urllib.parse import urlparse
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NAMESPACE = os.environ["MY_POD_NAMESPACE"]
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LABEL_MANAGED_BY = "camera-operator"
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with open("camera-service.yml") as stream:
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SERVICE_BODY = stream.read()
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with open("camera-deployment.yml") as stream:
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DEPLOYMENT_BODY = stream.read()
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async def apply_changes(item, v1, now, apps_api):
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target = item["spec"]["target"]
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replicas = item["spec"].get("replicas")
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# Pull in secrets for the target URL
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secret_ref = item["spec"].get("secretRef")
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if secret_ref:
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secret = await v1.read_namespaced_secret(secret_ref, NAMESPACE)
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username = b64decode(secret.data.get("username", b"")).decode("ascii")
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password = b64decode(secret.data.get("password", b"")).decode("ascii")
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o = urlparse(target)
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netloc = o.netloc
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if "@" in netloc:
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_, netloc = o.netloc.split("@", 1)
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target = o._replace(netloc="%s:%s@%s" % (username, password, netloc)).geturl()
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name = "camera-%s" % item["metadata"]["name"]
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print("Applying changes for", name, "CRD")
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# Generate Deployment
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body = yaml.safe_load(DEPLOYMENT_BODY.replace("foobar", name))
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body["metadata"]["labels"] ["app.kubernetes.io/managed-by"] = LABEL_MANAGED_BY
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body["metadata"]["labels"] ["modified"] = now
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body["spec"]["template"]["spec"]["containers"][0]["args"] = [target]
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if replicas:
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body["spec"]["replicas"] = replicas
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try:
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await apps_api.replace_namespaced_deployment(
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name = name, body = body, namespace=NAMESPACE)
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print(" * Updated deployment %s/%s" % (NAMESPACE, name))
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except client.exceptions.ApiException as e:
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await apps_api.create_namespaced_deployment(
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body = body, namespace=NAMESPACE)
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print(" * Created deployment %s/%s" % (NAMESPACE, name))
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# Generate Service
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body = yaml.safe_load(SERVICE_BODY.replace("foobar", name))
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body["metadata"]["labels"] ["app.kubernetes.io/managed-by"] = LABEL_MANAGED_BY
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body["metadata"]["labels"] ["modified"] = now
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try:
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await v1.replace_namespaced_service(
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name = name, body = body, namespace=NAMESPACE)
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print(" * Updated service %s/%s" % (NAMESPACE, name))
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except client.exceptions.ApiException as e:
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await v1.create_namespaced_service(
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body = body, namespace=NAMESPACE)
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print(" * Created service %s/%s" % (NAMESPACE, name))
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async def main():
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await config.load_kube_config()
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if os.getenv("KUBECONFIG"):
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await config.load_kube_config()
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else:
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await config.load_incluster_config()
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async with ApiClient() as api:
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v1 = client.CoreV1Api(api)
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apps_api = client.AppsV1Api()
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print("Listing namespaces")
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ret = await v1.list_namespace()
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api_instance = client.CustomObjectsApi(api)
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now = str(time())
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for i in ret.items:
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try:
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resp = await api_instance.list_namespaced_custom_object(
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"k-space.ee", "v1alpha1", i.metadata.name, "cams")
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except client.exceptions.ApiException:
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w = watch.Watch()
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args = "k-space.ee", "v1alpha1", NAMESPACE, "cams"
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resp = await api_instance.list_namespaced_custom_object(*args)
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for i in resp["items"]:
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await apply_changes(i, v1, now, apps_api)
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print("Cleaning up dangling deployments and services")
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resp = await v1.list_namespaced_service(NAMESPACE)
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for i in resp.items:
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if not i.metadata.labels:
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continue
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for item in resp["items"]:
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target = item["spec"]["target"]
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replicas = item["spec"].get("replicas")
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if i.metadata.labels.get("app.kubernetes.io/managed-by") != LABEL_MANAGED_BY:
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continue
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if i.metadata.labels.get("modified") == now:
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continue
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print(" * Removing service: %s/%s" % (NAMESPACE, i.metadata.name))
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await v1.delete_namespaced_service(i.metadata.name, NAMESPACE)
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# Pull in secrets for the target URL
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secret_ref = item["spec"].get("secretRef")
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if secret_ref:
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secret = await v1.read_namespaced_secret(secret_ref, i.metadata.name)
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username = b64decode(secret.data.get("username", b"")).decode("ascii")
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password = b64decode(secret.data.get("password", b"")).decode("ascii")
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o = urlparse(target)
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netloc = o.netloc
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if "@" in netloc:
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_, netloc = o.netloc.split("@", 1)
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target = o._replace(netloc="%s:%s@%s" % (username, password, netloc)).geturl()
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resp = await apps_api.list_namespaced_deployment(NAMESPACE)
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for i in resp.items:
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if not i.metadata.labels:
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continue
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if i.metadata.labels.get("app.kubernetes.io/managed-by") != LABEL_MANAGED_BY:
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continue
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if i.metadata.labels.get("modified") == now:
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continue
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print(" * Removing deployment: %s/%s" % (NAMESPACE, i.metadata.name))
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await apps_api.delete_namespaced_deployment(i.metadata.name, NAMESPACE)
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name = "camera-%s" % item["metadata"]["name"]
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print("Applying", name)
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print("Subscribing to updates")
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# Generate Deployment
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body = yaml.safe_load(DEPLOYMENT_BODY.replace("foobar", name))
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body["metadata"]["labels"] ["app.kubernetes.io/managed-by"] = LABEL_MANAGED_BY
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body["metadata"]["labels"] ["modified"] = now
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body["spec"]["template"]["spec"]["containers"][0]["args"] = [target]
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if replicas:
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body["spec"]["replicas"] = replicas
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async for event in w.stream(api_instance.list_namespaced_custom_object, *args):
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if event["type"] == "ADDED":
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await apply_changes(event["object"], v1, now, apps_api)
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elif event["type"] == "DELETED":
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name = "camera-%s" % event["object"]["metadata"]["name"]
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try:
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await apps_api.replace_namespaced_deployment(
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name = name, body = body, namespace=i.metadata.name)
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print("Updated deployment %s/%s" % (i.metadata.name, name))
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await v1.delete_namespaced_service(name, NAMESPACE)
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except client.exceptions.ApiException as e:
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await apps_api.create_namespaced_deployment(
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body = body, namespace=i.metadata.name)
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print("Created deployment %s/%s" % (i.metadata.name, name))
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# Generate Service
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body = yaml.safe_load(SERVICE_BODY.replace("foobar", name))
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body["metadata"]["labels"] ["app.kubernetes.io/managed-by"] = LABEL_MANAGED_BY
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body["metadata"]["labels"] ["modified"] = now
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pass
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else:
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print("Removed service: %s/%s" % (NAMESPACE, name))
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try:
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await v1.replace_namespaced_service(
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name = name, body = body, namespace=i.metadata.name)
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print("Updated service %s/%s" % (i.metadata.name, name))
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await apps_api.delete_namespaced_deployment(name, NAMESPACE)
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except client.exceptions.ApiException as e:
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await v1.create_namespaced_service(
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body = body, namespace=i.metadata.name)
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print("Created service %s/%s" % (i.metadata.name, name))
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pass
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else:
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print("Removed deployment: %s/%s" % (NAMESPACE, name))
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deployments = await apps_api.list_deployment_for_all_namespaces()
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for dep in deployments.items:
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if not dep.metadata.labels:
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continue
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if dep.metadata.labels.get("app.kubernetes.io/managed-by") != LABEL_MANAGED_BY:
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continue
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if dep.metadata.labels.get("modified") == now:
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continue
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print("Removing deployment: %s/%s" % (dep.metadata.namespace, dep.metadata.name))
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await apps_api.delete_namespaced_deployment(name=dep.metadata.name, namespace=dep.metadata.namespace)
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print("Done")
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if __name__ == '__main__':
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loop = asyncio.get_event_loop()
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loop = asyncio.new_event_loop()
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loop.run_until_complete(main())
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loop.close()
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