Reference library

Microservices patterns

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

3 matches

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
  …

14 0 Open

Microservices patterns medium

How to Implement a Two-Phase Commit Mock in Python

Simulate a distributed two-phase commit with prepare, commit, and abort phases, including deterministic failure injection for testing.

2pc transaction microservices

Python

import random
from dataclasses import dataclass
from typing import Dict, List, Optional


@dataclass
class Transaction:
    tx_id: int
    data: Dict[str, str]


class TwoPhaseCommitMock:
    """Simple two-phase commit mock with prepare and commit phases."""

    def __init__(self) -> None:
        self.prepared: List…

13 0 Open

Microservices patterns easy

How to Order Partition Key Events in Python (Mock Stream)

Generate a mock event stream grouped by partition key and sort it deterministically by key then sequence in Python.

partition events sorting

Python

import itertools
import random


def partition_key_events(keys, events_per_key=3, seed=None):
    """Produce a realistic-looking, but mock, event stream grouped by partition key.

    Args:
        keys: iterable of partition keys (e.g. strings or ints).
        events_per_key: how many events we want per key.
       …

11 0 Open

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