openserverless/ingress.py

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import kopf, logging, json, time
import openserverless.kube as kube
import openserverless.kustomize as kus
import openserverless.config as cfg
import openserverless.util as util

def get_ingress_pod_name(runtime, namespace="ingress-nginx"):
    jpath = r"{.items[?(@.metadata.labels.app\.kubernetes\.io\/component == 'controller')].metadata.name}"

    if runtime == "microk8s":
         jpath= "{.items[?(@.metadata.labels.name == 'nginx-ingress-microk8s')].metadata.name}"

    # pod_name is retuned as a string array
    pod_name = kube.kubectl("get", "pods", namespace=namespace, jsonpath=jpath)
    if pod_name:
        return pod_name[0]
    
    return None

def wait_for_ingress_ready(runtime, namespace="ingress-nginx"):
    pod_name = get_ingress_pod_name(runtime, namespace)

    if pod_name:
        logging.info(f"checking for {pod_name}")
        while not kube.wait(f"pod/{pod_name}", "condition=ready",namespace=namespace):
            logging.info(f"waiting for {pod_name} to be ready...")
            time.sleep(1)
    else:
        logging.error("*** could not determine if ingress-nginx pod is up and running")



# determine the ingress-nginx flavour
def get_ingress_service(runtime):
    return "service/ingress-nginx-controller"

def create(owner=None): 
    runtime = cfg.get('openserverless.kube')
    namespace = util.get_ingress_namespace(runtime)
    service = get_ingress_service(runtime)

    if(runtime == "microk8s"):
        logging.info("*** checking availability of microk8s ingress addon")
        pod_name = get_ingress_pod_name(runtime, namespace)

        if pod_name:
            return f"*** ingress-nginx {pod_name} already installed...skipping setup"
        else:
            # TODO find a way to setup the standard ingress-nginx also on microk8s. For the moment we ask to enable it.
            return "*** microk8s ingress missing. Enable it using microk8s enable ingress on your cluster"
    else:
        ingress = kube.get(service,namespace)
        if ingress:
            return "*** ingress-nginx already installed...skipping setup"

    ingress_yaml = util.get_ingress_yaml(runtime)
    logging.info(f"*** Configuring ingress-nginx {ingress_yaml}")

    # we apply the ingress specs as they are
    spec_setup = "deploy/ingress-nginx/operator-ingress-rbac.yaml"
    cfg.put("state.ingress.spec_setup", spec_setup)
    res = kube.kubectl("apply", "-f", spec_setup, namespace=None)
    logging.info(res)

    spec = f"deploy/ingress-nginx/{ingress_yaml}"
    cfg.put("state.ingress.spec", spec)
    
    # apply and waits for ingress to be ready  
    res = kube.kubectl("apply", "-f", spec, namespace=None)
    wait_for_ingress_ready(runtime, namespace)
    return res

def delete():
    spec = cfg.get("state.ingress.spec")
    res = False

    if spec:
        res = kube.kubectl("delete", "-f", spec, namespace=None)
        return res