kiarina-lib-google-cloud-storage 1.18.1

Google Cloud Storage client library for kiarina namespace

kiarina-lib-google-cloud-storage

A Python client library for Google Cloud Storage with configuration management using pydantic-settings-manager.

Purpose

This library separates infrastructure configuration (bucket names, blob paths, credentials) from application code, enabling:

• Multi-environment deployment with the same codebase
• Multi-tenant applications with isolated storage
• Testable code without hard-coded infrastructure details
• Blob path structures aligned with GCS security rules

Installation

pip install kiarina-lib-google-cloud-storage

Quick Start

from kiarina.lib.google.cloud_storage import get_blob, settings_manager

# Configure storage settings
settings_manager.user_config = {
    "default": {
        "bucket_name": "my-app-data",
        "blob_name_pattern": "users/{user_id}/files/{basename}"
    }
}

# Get blob with placeholders
blob = get_blob(placeholders={
    "user_id": "123",
    "basename": "profile.json"
})
# Actual path: gs://my-app-data/users/123/files/profile.json

# Use native google-cloud-storage API
blob.upload_from_string("Hello, World!")
content = blob.download_as_text()

API Reference

get_storage_client()

Get an authenticated Google Cloud Storage client.

def get_storage_client(
    auth_settings_key: str | None = None,
    **kwargs: Any
) -> storage.Client

Parameters:

• auth_settings_key: Configuration key for kiarina-lib-google-auth (default: None)
• **kwargs: Additional arguments passed to storage.Client()

Returns: storage.Client - Authenticated Google Cloud Storage client

Example:

from kiarina.lib.google.cloud_storage import get_storage_client

client = get_storage_client()
client = get_storage_client(auth_settings_key="production")

get_bucket()

Get a Google Cloud Storage bucket.

def get_bucket(
    settings_key: str | None = None,
    *,
    auth_settings_key: str | None = None,
    **kwargs: Any
) -> storage.Bucket

Parameters:

• settings_key: Configuration key for storage settings (default: None)
• auth_settings_key: Configuration key for authentication (default: None)
• **kwargs: Additional arguments passed to get_storage_client()

Returns: storage.Bucket - Google Cloud Storage bucket

Example:

from kiarina.lib.google.cloud_storage import get_bucket

bucket = get_bucket()
bucket = get_bucket(settings_key="production", auth_settings_key="prod_auth")

# Use native google-cloud-storage API
for blob in bucket.list_blobs(prefix="users/"):
    print(blob.name)

get_blob()

Get a Google Cloud Storage blob.

def get_blob(
    blob_name: str | None = None,
    *,
    placeholders: dict[str, Any] | None = None,
    settings_key: str | None = None,
    auth_settings_key: str | None = None,
    **kwargs: Any
) -> storage.Blob

Parameters:

• blob_name: Full blob path (default: None)
• placeholders: Placeholders for blob_name_pattern formatting (default: None)
• settings_key: Configuration key for storage settings (default: None)
• auth_settings_key: Configuration key for authentication (default: None)
• **kwargs: Additional arguments passed to get_bucket()

Returns: storage.Blob - Google Cloud Storage blob

Blob Name Resolution Priority:

1. Explicit blob_name parameter
2. blob_name_pattern with placeholders
3. blob_name_pattern without placeholders (fixed name)

Example:

from kiarina.lib.google.cloud_storage import get_blob

# Direct blob name
blob = get_blob(blob_name="users/123/profile.json")

# Using pattern with placeholders
blob = get_blob(placeholders={"user_id": "123", "basename": "profile.json"})

# Using fixed pattern from settings
blob = get_blob()

# Use native google-cloud-storage API
blob.upload_from_string("content")
content = blob.download_as_text()
blob.delete()

GoogleCloudStorageSettings

Pydantic settings model for Google Cloud Storage configuration.

Fields:

• bucket_name (str, required): Google Cloud Storage bucket name
• blob_name_pattern (str | None, optional): Blob name pattern with placeholders (e.g., "users/{user_id}/files/{basename}")

Example:

from kiarina.lib.google.cloud_storage import GoogleCloudStorageSettings

settings = GoogleCloudStorageSettings(
    bucket_name="my-bucket",
    blob_name_pattern="users/{user_id}/files/{basename}"
)

settings_manager

Global settings manager instance for managing multiple configurations.

Type: SettingsManager[GoogleCloudStorageSettings]

Example:

from kiarina.lib.google.cloud_storage import settings_manager

# Single configuration
settings_manager.user_config = {
    "bucket_name": "my-bucket",
    "blob_name_pattern": "files/{basename}"
}

# Multiple configurations
settings_manager.user_config = {
    "production": {
        "bucket_name": "prod-bucket",
        "blob_name_pattern": "v2/prod/{basename}"
    },
    "staging": {
        "bucket_name": "staging-bucket",
        "blob_name_pattern": "v2/staging/{basename}"
    }
}

Configuration

YAML Configuration

# config/production.yaml
kiarina.lib.google.auth:
  default:
    type: service_account
    service_account_file: /secrets/prod-sa-key.json

kiarina.lib.google.cloud_storage:
  default:
    bucket_name: prod-us-west1-app-data
    blob_name_pattern: "v2/production/{tenant_id}/users/{user_id}/files/{basename}"

Loading Configuration:

import yaml
from pydantic_settings_manager import load_user_configs

with open("config/production.yaml") as f:
    config = yaml.safe_load(f)
load_user_configs(config)

# Now all modules are configured
from kiarina.lib.google.cloud_storage import get_blob
blob = get_blob(placeholders={
    "tenant_id": "acme",
    "user_id": "123",
    "basename": "data.json"
})

Multiple Environments:

# config/production.yaml
kiarina.lib.google.cloud_storage:
  default:
    bucket_name: prod-us-west1-app-data
    blob_name_pattern: "v2/production/{basename}"

# config/staging.yaml
kiarina.lib.google.cloud_storage:
  default:
    bucket_name: staging-app-data
    blob_name_pattern: "v2/staging/{basename}"

# config/development.yaml
kiarina.lib.google.cloud_storage:
  default:
    bucket_name: dev-local-data
    blob_name_pattern: "v2/dev/{basename}"

Multi-Tenant Configuration:

kiarina.lib.google.cloud_storage:
  tenant_acme:
    bucket_name: acme-corp-data
    blob_name_pattern: "app-data/{basename}"
  tenant_globex:
    bucket_name: globex-data
    blob_name_pattern: "app-data/{basename}"

Blob Name Pattern Examples:

# Fixed name
blob_name_pattern: "data.json"

# Single placeholder
blob_name_pattern: "files/{basename}"

# Multiple placeholders
blob_name_pattern: "my-service/{tenant_id}/users/{user_id}/files/{basename}"

# Hierarchical structure
blob_name_pattern: "v2/{environment}/{service}/{tenant_id}/{resource_type}/{resource_id}/{basename}"

Environment Variables:

All settings can be configured via environment variables with the KIARINA_LIB_GOOGLE_CLOUD_STORAGE_ prefix:

export KIARINA_LIB_GOOGLE_CLOUD_STORAGE_BUCKET_NAME="my-bucket"
export KIARINA_LIB_GOOGLE_CLOUD_STORAGE_BLOB_NAME_PATTERN="users/{user_id}/files/{basename}"

Configuration Priority:

1. CLI arguments (via settings_manager.cli_args)
2. Environment variables
3. User configuration (via settings_manager.user_config)
4. Default values

Testing

Running Tests

# Run tests (requires test configuration)
mise run package:test kiarina-lib-google-cloud-storage

# With coverage
mise run package:test kiarina-lib-google-cloud-storage --coverage

Test Configuration

1. Copy sample files:

   cp .env.sample .env
   cp test_settings.sample.yaml test_settings.yaml
   

2. Edit test_settings.yaml with your GCS configuration:

   kiarina.lib.google.auth:
     service_account:
       type: service_account
       service_account_file: ~/.gcp/service-account/your-project/key.json
   
   kiarina.lib.google.cloud_storage:
     default:
       bucket_name: your-test-bucket
       blob_name_pattern: "test/{tenant_id}/users/{user_id}/files/{basename}"
   

3. Set environment variable:

   export KIARINA_LIB_GOOGLE_CLOUD_STORAGE_TEST_SETTINGS_FILE=/path/to/test_settings.yaml
   

Writing Tests

# tests/conftest.py
import pytest
from kiarina.lib.google.cloud_storage import settings_manager

@pytest.fixture
def storage_config():
    settings_manager.user_config = {
        "test": {
            "bucket_name": "test-bucket",
            "blob_name_pattern": "test-run/{basename}"
        }
    }

# tests/test_user_service.py
def test_save_user_profile(storage_config):
    from myapp.services import save_user_profile
    save_user_profile("user123", {"name": "Alice"})
    
    from kiarina.lib.google.cloud_storage import get_blob
    blob = get_blob(placeholders={"basename": "users/user123/profile.json"})
    assert blob.exists()

Dependencies

• google-cloud-storage (>=2.19.0) - Google Cloud Storage client library
• kiarina-lib-google-auth (>=1.4.0) - Google Cloud authentication library
• pydantic-settings (>=2.10.1) - Settings management
• pydantic-settings-manager (>=2.3.0) - Advanced settings management

License

This project is licensed under the MIT License - see the LICENSE file for details.

Related Projects

• kiarina-python - The main monorepo containing this package
• kiarina-lib-google-auth - Google Cloud authentication library
• pydantic-settings-manager - Configuration management library