Reference library

Microservices patterns

Service boundaries, discovery, inter-service calls, and decomposition patterns.

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Microservices patterns easy

How to Check an External Gateway vs Use an Internal Mock in Python

This code checks whether an external network gateway is reachable using ping, then falls back to a deterministic internal mock for testing environments.

network-check mock microservices
Python 
import subprocess
import sys

def check_external_gateway():
    """True if we can reach an external network target."""
    try:
        subprocess.run(
            ["ping", "-c", "1", "-W", "2", "8.8.8.8"],
            capture_output=True,
            timeout=3,
            check=True,
        )
        return True
  …
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