Middleware API Client

Python client for the FAIRagro Middleware API with certificate-based authentication (mTLS).

Features

✅ Certificate-based authentication (mutual TLS)
✅ Configuration via YAML files, environment variables, or Docker secrets
✅ Async context manager support
✅ Comprehensive error handling
✅ Type-safe with Pydantic models

Installation

This package is part of the FAIRagro Advanced Middleware project and uses local dependencies.

Quick Start

1. Create Configuration File

# config.yaml
log_level: INFO
api_url: https://your-api-server:8000
client_cert_path: /path/to/client-cert.pem
client_key_path: /path/to/client-key.pem
ca_cert_path: /path/to/ca-cert.pem  # optional
timeout: 30.0
verify_ssl: true

2. Use the Client

import asyncio
from pathlib import Path
from arctrl import ARC, ArcInvestigation
from middleware.api_client import Config, ApiClient


async def main():
    # Load configuration
    config = Config.from_yaml_file(Path("config.yaml"))

    # Create ARC object
    inv = ArcInvestigation.create(identifier="my-arc", title="My ARC")
    arc = ARC.from_arc_investigation(inv)

    # Use client with context manager
    async with ApiClient(config) as client:
        # Send a single ARC
        response = await client.create_or_update_arc(
            rdi="my-rdi",
            arc=arc,  # Can be ARC object, dict, or JSON string
        )
        print(f"ARC status: {response.status}")

        # Or run a harvest workflow
        async def arc_stream():
            yield arc  # Can yield ARC objects, dicts, or JSON strings

        harvest = await client.harvest_arcs(
            rdi="my-rdi",
            arcs=arc_stream(),
            expected_datasets=1,
        )
        print(f"Harvest status: {harvest.status}")


asyncio.run(main())

Configuration Options

Option	Type	Required	Default	Description
`log_level`	string	No	INFO	Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
`api_url`	string	Yes	-	Base URL of the Middleware API
`client_cert_path`	string	No	null	Path to client certificate (PEM format)
`client_key_path`	string	No	null	Path to client private key (PEM format)
`ca_cert_path`	string	No	null	Path to CA certificate for server verification
`timeout`	float	No	30.0	Request timeout in seconds
`verify_ssl`	bool	No	true	Enable SSL certificate verification
`max_concurrency`	int	No	10	Maximum concurrent API requests (also default for `harvest_arcs`)

API Methods

`create_or_update_arc(rdi: str, arc: ARC | dict | str) -> ArcResult`

Create or update one ARC in the Middleware API.

Parameters:

rdi (str): The RDI identifier (e.g., "edaphobase").
arc (ARC | dict | str): ARC object from arctrl, pre-serialised RO-Crate dict, or JSON string.

Returns:

ArcResult: Contains the result of the operation.

Raises:

ApiClientError: If the request fails due to HTTP errors, network issues, or invalid JSON.

Example:

from arctrl import ARC, ArcInvestigation

inv = ArcInvestigation.create(identifier="my-arc-001", title="My ARC")
arc = ARC.from_arc_investigation(inv)

response = await client.create_or_update_arc(
    rdi="edaphobase",
    arc=arc,  # Can also be dict or JSON string
)

`harvest_arcs(rdi: str, arcs: AsyncIterator[ARC | dict | str], expected_datasets: int | None = None) -> HarvestResult`

Convenience workflow to create a harvest, upload all ARCs from an async iterator, and complete the harvest.

Uses config.max_concurrency by default.
Continues on item-level submission errors and skips failed items.
Cancels the harvest only for catastrophic errors.
Supports ARC objects, pre-serialised RO-Crate dicts, and JSON strings.

All errors are raised as ApiClientError exceptions:

from middleware.api_client import ApiClientError

try:
    response = await client.create_or_update_arc(
        rdi="my-rdi",
        arc=arc,  # Can be ARC object, dict, or JSON string
    )
except ApiClientError as e:
    print(f"API Error: {e}")

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