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Mock GCP storage bucket blob upload in Python
Simulate uploading a blob to a GCP Storage bucket for testing without hitting the cloud.
import io
from datetime import datetime
from unittest.mock import MagicMock, patch
class MockBlob:
"""Simulates a GCP storage blob for unit testing."""
def __init__(self, name):
self.name = name
self.uploaded_at = None
self.content = b""
def upload_from_file(self, file_obj):
…Mock Google Pub/Sub publish and pull in Python
A lightweight in-memory mock of Google Pub/Sub with publisher/subscriber classes to test topic-based fan-out and message pulling without real infrastructure.
import json
import time
from collections import deque
from dataclasses import dataclass, field
from typing import Any, Callable
@dataclass
class Message:
data: str
attributes: dict[str, str] = field(default_factory=dict)
message_id: str | None = None
ack_id: str | None = None
class MockPublisher:
…Mock S3, GCS, and Azure storage with a Python abstract interface
Define an abstract Storage interface and implement a local, filesystem-backed mock so S3, GCS, and Azure code can be tested without cloud dependencies.
from abc import ABC, abstractmethod
from pathlib import Path
class Storage(ABC):
@abstractmethod
def put(self, name: str, data: bytes) -> None:
pass
@abstractmethod
def get(self, name: str) -> bytes:
pass
class LocalStorage(Storage):
def __init__(self, base_dir: str = "mock_sto…GCRA generic cell rate algorithm in Python
Mock implementation of the Generic Cell Rate Algorithm (GCRA) for traffic shaping and rate limiting.
from collections import deque
import time
class GCRA:
def __init__(self, rate, burst):
self.tau = burst
self.T = rate
self.t = 0
self.LCT = 0
def add_cell(self, arrival_time):
if arrival_time <= self.t:
return False
arrived_early = (arrival_time - s…AES GCM encryption and decryption in Python
Encrypt and decrypt data with AES-256-GCM using the cryptography library, including nonce generation and authenticated roundtrip verification.
import os
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
def aes_gcm_demo():
plaintext = b"confidential message"
key = AESGCM.generate_key(bit_length=256)
aesgcm = AESGCM(key)
nonce = os.urandom(12)
ciphertext = aesgcm.encrypt(nonce, plaintext, None)
decrypted = aesgcm.dec…How to Mock KMS Envelope Encryption in Python
Demonstrates a minimal mock of AWS KMS envelope encryption flow with AES-GCM data key wrapping and unwrapping.
import base64
import json
import os
import hashlib
class MockKMS:
"""Minimal mock of AWS KMS envelope encryption flow."""
def generate_data_key(self):
# Simulate KMS returning a plaintext and encrypted data key
plaintext_key = os.urandom(32)
encrypted_key = hashlib.sha256(plaintext_k…Browse by section
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Guide: free Python code samples library
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