In Truefoundry workflow you can pass the dockerfile path in the task config, this is useful when you want to install a binary and use it in your python function task like using a jq command, etc.

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TaskDockerFileBuild

  • To use dockerfile for python task, we need to import TaskDockerFileBuild and use it in PythonTaskConfig.
from truefoundry.workflow import task, workflow, PythonTaskConfig, TaskDockerFileBuild
from truefoundry.deploy import Resources

task_config = PythonTaskConfig(
    image=TaskDockerFileBuild(
        dockerfile_path="Dockerfile",
    ),
    resources=Resources(cpu_request=0.5)
)

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Example

In this guide, we will see how to write a Python function task with a dockerfile. In this example, we will take a string as an input and then will calculate the SHA56 hash from the input. We will be passing the

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Prerequisites

Before you proceed with the guide, make sure you have the following:

  • Truefoundry CLI: Set up and configure the TrueFoundry CLI tool on your local machine by following the Setup for CLI guide.
  • Workspace: To deploy your workflow, you’ll need a workspace. If you don’t have one, you can create it using this guide: Creating a Workspace or seek assistance from your cluster administrator.

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Creating the workflow

Create a workflow.py where we will write the code for our workflow and place it in the project root directory with your Dockerfile.

Your directory structure will then appear as follows:

.
├── workflow.py
└── Dockerfile

Dockerfile

# Use an official Python runtime as a parent image
FROM python:3.10-slim

# Install jq binary
RUN apt-get update && apt-get install -y jq

# Set the working directory
WORKDIR /app

RUN pip install truefoundry[workflow]==0.4.8

# Copy the current directory contents into the container
COPY . /app

# Set the default command to run Python
CMD ["python"]

workflow.py

from truefoundry.workflow import task, workflow, PythonTaskConfig, TaskDockerFileBuild
from truefoundry.deploy import Resources

task_config = PythonTaskConfig(
    image=TaskDockerFileBuild(
        dockerfile_path="Dockerfile",
    ),
    resources=Resources(cpu_request=0.45)
)


@task(task_config=task_config)
def run_jq(input_json: str) -> str:
    import subprocess

    # Run the jq binary using Python's subprocess module
    process = subprocess.run(
        ["jq", "."],  # jq command to pretty-print JSON
        input=input_json,
        text=True,
        capture_output=True,
    )
    return process.stdout


@workflow
def my_workflow(input_json: str) -> str:
    return run_jq(input_json=input_json)
  • As you can see, we have given the dockerfile_path argument in PythonTaskConfig where the path to the docker file is used as its value.

Now run the below command in the terminal to deploy your workflow, replace <workfspace-fqn> with the workspace fqn which you can find on the UI.

tfy deploy workflow \
  --name dockerfile-build-wf \
  --file workflow.py \
  --workspace_fqn "Paste your workspace FQN here"