Mindtrace Storage

The Storage module provides Mindtrace’s abstraction layer for object storage backends such as Google Cloud Storage and S3-compatible services.

Features

• Unified object-storage interface through StorageHandler
• Backend support for Google Cloud Storage and S3-compatible storage
• Structured operation results with Status, FileResult, StringResult, and BatchResult
• File and string operations for both local-file workflows and in-memory content
• Batch and folder helpers for multi-object workflows
• Presigned URL and metadata helpers for remote object access

Quick Start

from mindtrace.storage import GCSStorageHandler


storage = GCSStorageHandler(
    bucket_name="your-bucket-name",
    project_id="your-gcp-project-id",
)

result = storage.upload("local_file.txt", "docs/local_file.txt")
print(result.status)

objects = storage.list_objects(prefix="docs/")
print(objects)

In practice, the storage package gives you one common interface for object stores, while preserving backend-specific authentication and deployment details.

StorageHandler

StorageHandler is the common abstraction that storage backends implement.

Core operations include:

• upload()
• download()
• delete()
• upload_string()
• download_string()
• list_objects()
• exists()
• get_presigned_url()
• get_object_metadata()

The base class also provides convenience helpers for:

• upload_batch()
• download_batch()
• download_string_batch()
• delete_batch()
• upload_folder()
• download_folder()

That means you can write code against the common interface while choosing the backend that fits your deployment.

Result Types

Storage operations return structured result objects rather than only raw values.

Status

Possible statuses include:

• ok
• skipped
• already_exists
• overwritten
• not_found
• error

FileResult

Returned by file-based operations such as upload(), download(), and delete().

from mindtrace.storage import GCSStorageHandler, Status


storage = GCSStorageHandler(bucket_name="your-bucket")
result = storage.upload("local.txt", "docs/local.txt", fail_if_exists=True)

if result.status == Status.ALREADY_EXISTS:
    print("Object already exists")
elif result.ok:
    print("Upload succeeded")
else:
    print(result.error_type, result.error_message)

StringResult

Returned by in-memory content operations such as upload_string() and download_string().

content_result = storage.download_string("docs/config.json")
if content_result.ok:
    print(content_result.content)

BatchResult

Returned by batch file operations. It gives you filtered result views such as:

• ok_results
• skipped_results
• conflict_results
• failed_results
• all_ok

batch = storage.upload_batch(
    [("a.txt", "docs/a.txt"), ("b.txt", "docs/b.txt")],
    fail_if_exists=True,
)

print(len(batch.ok_results))
print(len(batch.failed_results))

Google Cloud Storage

Use GCSStorageHandler when you want Google Cloud Storage support.

from mindtrace.storage import GCSStorageHandler


storage = GCSStorageHandler(
    bucket_name="your-bucket-name",
    project_id="your-gcp-project-id",
    credentials_path="~/service-account.json",  # optional
    create_if_missing=True,
)

Common GCS workflow

# Upload a file
upload_result = storage.upload("local_file.txt", "remote/path/file.txt")
print(upload_result.status)

# Download a file
download_result = storage.download("remote/path/file.txt", "downloaded.txt")
print(download_result.status)

# List objects
print(storage.list_objects(prefix="remote/path/"))

# Metadata
print(storage.get_object_metadata("remote/path/file.txt"))

Authentication notes

GCSStorageHandler supports:

• Application Default Credentials (ADC)
• explicit credentials_path

For local development, ADC is often enough:

$ gcloud auth application-default login

S3-Compatible Storage

Use S3StorageHandler when you want AWS S3, MinIO, DigitalOcean Spaces, or another S3-compatible service.

from mindtrace.storage import S3StorageHandler


storage = S3StorageHandler(
    bucket_name="my-bucket",
    endpoint="localhost:9000",
    access_key="minioadmin",
    secret_key="minioadmin",
    secure=False,
    create_if_missing=True,
)

Common S3 workflow

# Upload
result = storage.upload("local.txt", "docs/local.txt")
print(result.status)

# Check existence
print(storage.exists("docs/local.txt"))

# Generate a presigned URL
url = storage.get_presigned_url("docs/local.txt", expiration_minutes=30)
print(url)

Compatibility note

The S3 backend is not limited to AWS. It is designed for S3-compatible APIs more generally.

A backwards-compatible alias also exists in code:

• MinioStorageHandler = S3StorageHandler

String Operations

Use string operations when you want to avoid temporary local files.

from mindtrace.storage import GCSStorageHandler


storage = GCSStorageHandler(bucket_name="your-bucket")

upload_result = storage.upload_string(
    '{"hello": "world"}',
    "docs/config.json",
    content_type="application/json",
    fail_if_exists=True,
)
print(upload_result.status)

content_result = storage.download_string("docs/config.json")
if content_result.ok:
    print(content_result.content.decode("utf-8"))

These methods are especially useful for JSON, manifests, metadata blobs, or other generated content.

Batch and Folder Operations

The base class includes helpers for multi-object workflows.

Batch uploads/downloads

batch = storage.upload_batch(
    [
        ("a.txt", "docs/a.txt"),
        ("b.txt", "docs/b.txt"),
    ],
    max_workers=4,
)

for result in batch:
    print(result.remote_path, result.status)

Folder uploads

result = storage.upload_folder(
    local_folder="./reports",
    remote_prefix="archive/reports",
    include_patterns=["*.json", "*.txt"],
    exclude_patterns=["*.tmp"],
)

print(len(result.ok_results))

Folder downloads

result = storage.download_folder(
    remote_prefix="archive/reports",
    local_folder="./downloaded-reports",
)

print(len(result.results))

Presigned URLs and Metadata

Both storage backends expose helpers for common remote-object workflows.

url = storage.get_presigned_url("docs/local.txt", expiration_minutes=60, method="GET")
print(url)

metadata = storage.get_object_metadata("docs/local.txt")
print(metadata)

These are useful when you want to hand off temporary access to another system without proxying the object through your app.

Installation

Base install:

$ uv add mindtrace-storage

Or with pip:

$ pip install mindtrace-storage

If you are working from the full Mindtrace repo:

$ git clone https://github.com/Mindtrace/mindtrace.git && cd mindtrace
$ uv sync --dev --all-extras

Testing

If you are working in the full Mindtrace repo, run tests for this module specifically:

$ git clone https://github.com/Mindtrace/mindtrace.git && cd mindtrace
$ uv sync --dev --all-extras
$ ds test: storage
$ ds test: --unit storage

Practical Notes and Caveats

• GCS and S3-compatible backends use different authentication and bucket-management conventions.
• The S3 backend is intended for S3-compatible services generally, not only AWS S3.
• Structured result objects make it easier to handle partial failures and non-exception outcomes such as already_exists or skipped.
• Batch and folder helpers are convenience methods built on top of the core single-object operations.
• Presigned URL behavior depends on backend credentials, configuration, and object-store capabilities.