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How to Mock ELB Target Health Status in Python
Simulate AWS Elastic Load Balancer target health checks with a Python dict that mutates status and healthy host counts.
from random import randint
def elb_target_mock_status(target_id, healthy=True):
targets = {
1: {"Id": "i-001", "Status": "healthy", "Port": 80, "HealthyHostCount": 1},
2: {"Id": "i-002", "Status": "unhealthy", "Port": 80, "HealthyHostCount": 0},
3: {"Id": "i-003", "Status": "healthy", "Por…How to Build a Health Check System with Instance Up and Down Status in Python
Track instance health by marking them up or down and simulating health checks with a mock class in Python.
from datetime import datetime
import random
class HealthChecker:
def __init__(self):
self.status = {}
def mark_up(self, instance_id):
self.status[instance_id] = {
"state": "up",
"last_check": datetime.now().isoformat(),
"healthy": True
}
…Health Check Mark Unhealthy Stop Traffic Mock in Python
Simulates a health check with a 20% failure rate and automatically stops traffic when the service is unhealthy.
import time
import random
class HealthCheck:
def __init__(self):
self.is_healthy = True
self.stop_traffic = False
def check_health(self):
# Simulate health check with random failure rate (20% chance unhealthy)
self.is_healthy = random.random() > 0.2
return self.is_heal…How to Create a Deep Health Check Database in Python
Setup a SQLite-backed health check database, insert mock data with response times and statuses, and generate a report ordered by most recent check.
import sqlite3
from datetime import datetime, timedelta
from pathlib import Path
DB_PATH = Path("deep_health_check.db")
def setup_database():
conn = sqlite3.connect(DB_PATH)
cursor = conn.cursor()
cursor.execute("""
CREATE TABLE IF NOT EXISTS health_checks (
id INTEGER PRIMARY KEY AU…Mock Health Endpoint Liveness Check in Python
Simulate a liveness endpoint that reports service health with a configurable failure rate and uptime.
import time
import random
def liveness_check(service_name: str, failure_rate: float = 0.1) -> dict:
"""Mock health check that returns liveness status with a configurable failure rate."""
healthy = random.random() > failure_rate
response = {
"service": service_name,
"status": "alive" if he…How to Build a Health Check Service Registry in Python
Build a minimal Python service registry that handles registration, deregistration, health checks, and service listing in one simple class.
import random
import time
class ServiceRegistry:
def __init__(self):
self.services = {}
def register(self, name, address):
self.services[name] = {
"address": address,
"status": "healthy",
"registered_at": time.time(),
"checks": 0
}
…How to Mock a Dependency for Readiness Probe in Python
Use unittest.mock.Mock to simulate a dependency's readiness check response for testing a service's is_ready method without hitting a real connection.
import time
import unittest
from unittest.mock import Mock
class Service:
def __init__(self, dependency):
self.dependency = dependency
def is_ready(self):
try:
result = self.dependency.check()
return result == "ready"
except Exception:
return False
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