OutFleet/k8s.py

import base64
import json
import yaml
import logging
import threading
import time
from kubernetes import client, config as kube_config
from kubernetes.client.rest import ApiException

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
    datefmt="%d-%m-%Y %H:%M:%S",
)

log = logging.getLogger("OutFleet.k8s")
file_handler = logging.FileHandler("sync.log")
file_handler.setLevel(logging.DEBUG)
formatter = logging.Formatter(
    "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
file_handler.setFormatter(formatter)
log.addHandler(file_handler)

def write_config(config):
    config_map = client.V1ConfigMap(
        api_version="v1",
        kind="ConfigMap",
        metadata=client.V1ObjectMeta(
            name=f"config-outfleet",
            labels={
                "app": "outfleet",
            }
        ),
        data={"config.yaml": yaml.dump(config)}
    )
    try:
        api_response = V1.create_namespaced_config_map(
            namespace=NAMESPACE,
            body=config_map,
        )
    except ApiException as e:
        api_response = V1.patch_namespaced_config_map(
            name="config-outfleet",
            namespace=NAMESPACE,
            body=config_map,
        )
    log.info("Updated config in Kubernetes ConfigMap [config-outfleet]")

NAMESPACE = False
SERVERS = list()
CONFIG = None
V1 = None

def reload_config():
    global CONFIG
    while True:
        CONFIG = yaml.safe_load(V1.read_namespaced_config_map(name="config-outfleet", namespace=NAMESPACE).data['config.yaml'])
        log.debug(f"Synced system config with ConfigMap [config-outfleet].")
        time.sleep(30)


try:
    kube_config.load_incluster_config()
    V1 = client.CoreV1Api()
    try:
        with open("/var/run/secrets/kubernetes.io/serviceaccount/namespace") as f:
            NAMESPACE = f.read().strip()
        log.info(f"Found Kubernetes environment. Deployed to namespace '{NAMESPACE}'")
        try:
            CONFIG = yaml.safe_load(V1.read_namespaced_config_map(name="config-outfleet", namespace=NAMESPACE).data['config.yaml'])
            log.info(f"ConfigMap loaded from Kubernetes API. Servers: {len(CONFIG['servers'])}, Clients: {len(CONFIG['clients'])}. Started monitoring for changes every minute.")
        except Exception as e:
            try:
                write_config({"clients": [], "servers": {}, "ui_hostname": "accessible-address.com"})
                CONFIG = yaml.safe_load(V1.read_namespaced_config_map(name="config-outfleet", namespace=NAMESPACE).data['config.yaml'])
                log.info("Created new ConfigMap [config-outfleet]. Started monitoring for changes every minute.")
            except Exception as e:
                log.info(f"Failed to create new ConfigMap [config-outfleet] {e}")
        thread = threading.Thread(target=reload_config)
        thread.start()
    except:
        log.info("Kubernetes environment not detected")
except:
    log.info("Kubernetes environment not detected")