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Bacalhau Python SDK 🐍

This is the official Python SDK for Bacalhau, named bacalhau-sdk. It is a high-level SDK that ships the client-side logic (e.g. signing requests) needed to query the endpoints. Please take a look at the examples for snippets to create, list and inspect jobs. Under the hood, this SDK uses bacalhau-apiclient (autogenerated via Swagger/OpenAPI) to interact with the API.

Please make sure to use this SDK library in your Python projects, instead of the lower level bacalhau-apiclient. The latter is listed as a dependency of this SDK and will be installed automatically when you follow the installation instructions below.

Features

  • List, create and inspect Bacalhau jobs using Python objects 🎈
  • Use the production network, or set the following environment variables to target any Bacalhau network out there:
    • BACALHAU_API_HOST
    • BACALHAU_API_PORT
  • Generate a key pair used to sign requests stored in the path specified by the BACALHAU_DIR env var (default: ~/.bacalhau)

Install

From PyPi:

$ pip install bacalhau-sdk

From source:

Clone the public repository:

$ git clone https://github.com/bacalhau-project/bacalhau/

Once you have a copy of the source, you can install it with:

$ cd python/
$ pip install .

Initialize

Likewise the Bacalhau CLI, this SDK uses a key pair to be stored in BACALHAU_DIR used for signing requests. If a key pair is not found there, it will create one for you.

Example Use

Let's submit a Hello World job and then fetch its output data's CID. We start by importing this sdk, namely bacalhau_sdk, used to create and submit a job create request. Then we import bacalhau_apiclient (installed automatically with this sdk), it provides various object models that compose a job create request. These are used to populate a simple python dictionary that will be passed over to the submit util method.

import pprint

from bacalhau_apiclient.models.job import Job
from bacalhau_apiclient.models.task import Task
from bacalhau_apiclient.models.all_of_execution_published_result import SpecConfig
from bacalhau_apiclient.models.api_put_job_request import (
    ApiPutJobRequest as PutJobRequest,
)
from bacalhau_sdk.jobs import Jobs

task = Task(
    name="My Main task",
    engine=SpecConfig(
        type="docker",
        params=dict(
            Image="ubuntu:latest",
            Entrypoint=["/bin/bash"],
            Parameters=["-c", "echo Hello World"],
        ),
    ),
    publisher=SpecConfig(),
)

job = Job(name="A Simple Docker Job", type="batch", count=1, tasks=[task])
put_job_request = PutJobRequest(job=job)
jobs = Jobs()

put_job_response = jobs.put(put_job_request)
pprint.pprint(put_job_response)

The script above prints the following object, the job.metadata.id value is our newly created job id!

{ 
    'job': {    
        'constraints': [],
         'count': 1,
         'create_time': 1719930417160015000,
         'id': 'j-df836f6a-6920-44e4-9683-27f6ec1921e2',
         'labels': {},
         'meta': {'bacalhau.org/requester.id': 'node-0'},
         'modify_time': 1719930417160015000,
         'name': 'A Simple Docker Job',
         'namespace': 'default',
         'priority': 0,
         'revision': 1,
         'state': {'message': None, 'state_type': 'Pending'},
         'tasks': [{'engine': {'params': {'Entrypoint': ['/bin/bash'],
                                          'Image': 'ubuntu:latest',
                                          'Parameters': ['-c',
                                                         'echo Hello World']},
                               'type': 'docker'},
                    'env': None,
                    'input_sources': None,
                    'meta': None,
                    'name': 'My Main task',
                    'network': {'domains': None, 'type': 'None'},
                    'publisher': {'params': None, 'type': ''},
                    'resources': {'cpu': None,
                                  'disk': None,
                                  'gpu': None,
                                  'memory': None},
                    'result_paths': None,
                    'timeouts': {'execution_timeout': None,
                                 'queue_timeout': None,
                                 'total_timeout': 1800}}],
         'type': 'batch',
         'version': 0
    }
}

We can then use the results method to fetch, among other fields, the output data's CID.

from bacalhau_sdk.jobs import Jobs

jobs = Jobs()
print(results(jobs.results(job_id="710a0bc2-81d1-4025-8f80-5327ca3ce170")))

The line above prints the following dictionary:

{'results': [{'data': {'cid': 'QmYEqqNDdDrsRhPRShKHzsnZwBq3F59Ti3kQmv9En4i5Sw',
                       'metadata': None,
                       'name': 'job-710a0bc2-81d1-4025-8f80-5327ca3ce170-shard-0-host-QmYgxZiySj3MRkwLSL4X2MF5F9f2PMhAE3LV49XkfNL1o3',
                       'path': None,
                       'source_path': None,
                       'storage_source': 'IPFS',
                       'url': None},
              'node_id': 'QmYgxZiySj3MRkwLSL4X2MF5F9f2PMhAE3LV49XkfNL1o3',
              'shard_index': None}]}

Congrats, that was a good start! 🎈 Please find more code snippets in the examples folder (more examples published in the near future).

Devstack

You can set the environment variables BACALHAU_API_HOST and BACALHAU_API_PORT to point this SDK to your Bacalhau API (e.g. local devstack).

Developers guide

We use Poetry to manage this package, take a look at their official docs to install it. Note, all targets in the Makefile use poetry as well!

To develop this SDK locally, create a dedicated poetry virtual environment and install the root package (i.e. bacalhau_sdk) and its dependencies:

$ poetry install --no-interaction --with test,dev -vvv
Creating virtualenv bacalhau-sdk-9mIcLX8U-py3.9 in /Users/enricorotundo/Library/Caches/pypoetry/virtualenvs
Using virtualenv: /Users/enricorotundo/Library/Caches/pypoetry/virtualenvs/bacalhau-sdk-9mIcLX8U-py3.9
Installing dependencies from lock file
...

Note the line above installs the root package (i.e. bacalhau_sdk) in editable mode, that is, any change to its source code is reflected immediately without the need for re-packaging and re-installing it. Easy peasy!

Then install the pre-commit hooks and test it:

$ make install-pre-commit

$ make pre-commit