Mavenized image creation for readiness-check

Issue-ID: INT-1045
Change-Id: I9c7b7fd26c8f376600aa7efc9c1d9e2eee001cde
Signed-off-by: Dmitry Puzikov <dmitry.puzikov@tieto.com>

1 files changed, 189 insertions, 0 deletions

diff --git a/kubernetes/readiness/src/main/scripts/ready.py b/kubernetes/readiness/src/main/scripts/ready.py
new file mode 100644
index 0000000000..3f76d10395
--- /dev/null
+++ b/kubernetes/readiness/src/main/scripts/ready.py
@@ -0,0 +1,189 @@
+#!/usr/bin/env python
+import getopt
+import logging
+import os
+import sys
+import time
+import random
+
+from kubernetes import client
+
+# extract env variables.
+namespace = os.environ['NAMESPACE']
+cert = os.environ['CERT']
+host = os.environ['KUBERNETES_SERVICE_HOST']
+token_path = os.environ['TOKEN']
+
+with open(token_path, 'r') as token_file:
+    token = token_file.read().replace('\n', '')
+
+# setup logging
+log = logging.getLogger(__name__)
+handler = logging.StreamHandler(sys.stdout)
+formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
+handler.setFormatter(formatter)
+handler.setLevel(logging.INFO)
+log.addHandler(handler)
+log.setLevel(logging.INFO)
+
+configuration = client.Configuration()
+configuration.host = "https://" + host
+configuration.ssl_ca_cert = cert
+configuration.api_key['authorization'] = token
+configuration.api_key_prefix['authorization'] = 'Bearer'
+coreV1Api = client.CoreV1Api(client.ApiClient(configuration))
+api_instance = client.ExtensionsV1beta1Api(client.ApiClient(configuration))
+api = client.AppsV1beta1Api(client.ApiClient(configuration))
+batchV1Api = client.BatchV1Api(client.ApiClient(configuration))
+
+
+def is_job_complete(job_name):
+    complete = False
+    log.info("Checking if " + job_name + "  is complete")
+    try:
+        response = batchV1Api.read_namespaced_job_status(job_name, namespace)
+        if response.status.succeeded == 1:
+            job_status_type = response.status.conditions[0].type
+            if job_status_type == "Complete":
+                complete = True
+                log.info(job_name + " is complete")
+            else:
+                log.info(job_name + " is not complete")
+        else:
+            log.info(job_name + " has not succeeded yet")
+        return complete
+    except Exception as e:
+        log.error("Exception when calling read_namespaced_job_status: %s\n" % e)
+
+
+def wait_for_statefulset_complete(statefulset_name):
+    try:
+        response = api.read_namespaced_stateful_set(statefulset_name, namespace)
+        s = response.status
+        if (s.updated_replicas == response.spec.replicas and
+                s.replicas == response.spec.replicas and
+                s.ready_replicas == response.spec.replicas and
+                s.current_replicas == response.spec.replicas and
+                s.observed_generation == response.metadata.generation):
+            log.info("Statefulset " + statefulset_name + "  is ready")
+            return True
+        else:
+            log.info("Statefulset " + statefulset_name + "  is not ready")
+        return False
+    except Exception as e:
+        log.error("Exception when waiting for Statefulset status: %s\n" % e)
+
+
+def wait_for_deployment_complete(deployment_name):
+    try:
+        response = api.read_namespaced_deployment(deployment_name, namespace)
+        s = response.status
+        if (s.unavailable_replicas is None and
+                ( s.updated_replicas is None or s.updated_replicas == response.spec.replicas ) and
+                s.replicas == response.spec.replicas and
+                s.ready_replicas == response.spec.replicas and
+                s.observed_generation == response.metadata.generation):
+            log.info("Deployment " + deployment_name + "  is ready")
+            return True
+        else:
+            log.info("Deployment " + deployment_name + "  is not ready")
+        return False
+    except Exception as e:
+        log.error("Exception when waiting for deployment status: %s\n" % e)
+
+
+def is_ready(container_name):
+    ready = False
+    log.info("Checking if " + container_name + "  is ready")
+    try:
+        response = coreV1Api.list_namespaced_pod(namespace=namespace,
+                                                 watch=False)
+        for i in response.items:
+            # container_statuses can be None, which is non-iterable.
+            if i.status.container_statuses is None:
+                continue
+            for s in i.status.container_statuses:
+                if s.name == container_name:
+                    name = read_name(i)
+                    if i.metadata.owner_references[0].kind == "StatefulSet":
+                        ready = wait_for_statefulset_complete(name)
+                    elif i.metadata.owner_references[0].kind == "ReplicaSet":
+                        deployment_name = get_deployment_name(name)
+                        ready = wait_for_deployment_complete(deployment_name)
+                    elif i.metadata.owner_references[0].kind == "Job":
+                        ready = is_job_complete(name)
+
+                    return ready
+
+                else:
+                    continue
+        return ready
+    except Exception as e:
+        log.error("Exception when calling list_namespaced_pod: %s\n" % e)
+
+
+def read_name(item):
+    return item.metadata.owner_reference[0].name
+
+
+def get_deployment_name(replicaset):
+    api_response = api_instance.read_namespaced_replica_set_status(replicaset,
+                                                                   namespace)
+    deployment_name = read_name(api_response)
+    return deployment_name
+
+
+DEF_TIMEOUT = 10
+DESCRIPTION = "Kubernetes container readiness check utility"
+USAGE = "Usage: ready.py [-t <timeout>] -c <container_name> " \
+        "[-c <container_name> ...]\n" \
+        "where\n" \
+        "<timeout> - wait for container readiness timeout in min, " \
+        "default is " + str(DEF_TIMEOUT) + "\n" \
+        "<container_name> - name of the container to wait for\n"
+
+
+def main(argv):
+    # args are a list of container names
+    container_names = []
+    timeout = DEF_TIMEOUT
+    try:
+        opts, args = getopt.getopt(argv, "hc:t:", ["container-name=",
+                                                   "timeout=",
+                                                   "help"])
+        for opt, arg in opts:
+            if opt in ("-h", "--help"):
+                print("%s\n\n%s" % (DESCRIPTION, USAGE))
+                sys.exit()
+            elif opt in ("-c", "--container-name"):
+                container_names.append(arg)
+            elif opt in ("-t", "--timeout"):
+                timeout = float(arg)
+    except (getopt.GetoptError, ValueError) as e:
+        print("Error parsing input parameters: %s\n" % e)
+        print(USAGE)
+        sys.exit(2)
+    if container_names.__len__() == 0:
+        print("Missing required input parameter(s)\n")
+        print(USAGE)
+        sys.exit(2)
+
+    for container_name in container_names:
+        timeout = time.time() + timeout * 60
+        while True:
+            ready = is_ready(container_name)
+            if ready is True:
+                break
+            elif time.time() > timeout:
+                log.warning("timed out waiting for '" + container_name +
+                            "' to be ready")
+                exit(1)
+            else:
+                # spread in time potentially parallel execution in multiple
+                # containers
+                time.sleep(random.randint(5, 11))
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])
+