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---

ComfyUI API Endpoint <| <=  Comfy Catapult <=> HTTP Server <| <=  Public users
                     <|                                    <|
                     <|         Your python program        <| Your Webui/JS frontend
                     <|                                    <|
                     <|           Your workflows           <|
                     <|          Your HTTP server          <|

What is it?

Comfy Catapult is a library for scheduling and running ComfyUI workflows from a Python program, via the existing API endpoint. ComfyUI typically works by hosting this API endpoint for its user interface.

This makes it easier for you to make workflows via the UI, and then use it from a program.

🎇 Features

• ComfyUI API client (interface, implementation).
• ComfyUI Workflow scheduler (interface, implementation).
• ComfyUI API Pydantic Schema (./comfy_catapult/comfy_schema.py).
• Helpers to handle uploading and downloading files to/from ComfyUI.
• Simple CLI to execute workflows.

🔨 Installation

# Inside your environment:

# From pypi:
pip install comfy_catapult

# From git:
pip install git+https://github.com/realazthat/comfy-catapult.git@v3.0.0

🚜 Usage

Related Projects

Project	ComfyUI API Wrapper	Outsource Backend	Distribute Execution	Wrap Workflow	Studio
CushyStudio	?	?	?	?	Yes
ComfyUI-Serving-Toolkit	X	?	?	Yes	?
ComfyUI_NetDist	X	?	Yes	?	?
ComfyUI script_examples	Yes	No	No	No	No
comfyui-python-api	?	?	?	Yes	?
comfyui-deploy	?	?	?	Yes	?
ComfyUI-to-Python-Extension	?	?	?	Yes	?
ComfyScript	?	?	?	Yes	?
hordelib	?	Yes	?	?	?
comfyui-cloud	?	Yes	?	?	?
comfy_runner	?	?	?	?	?
ComfyUI-ComfyRun	?	?	?	?	?

📘 Documentation

Scheduling a Job

From comfy_catapult/catapult_base.py:

  async def Catapult(
      self,
      *,
      job_id: JobID,
      prepared_workflow: dict,
      important: Sequence[APINodeID],
      use_future_api: Literal[True],
      job_debug_path: Optional[Path] = None
  ) -> Tuple[JobStatus, 'asyncio.Future[dict]']:

Example usage:

From examples/sdxlturbo_example_catapulter.py:

class ExampleWorkflowInfo:
  # Direct wrapper around the ComfyUI API.
  client: ComfyAPIClientBase
  # Job scheduler (the main point of this library).
  catapult: ComfyCatapultBase
  # Something to help with retrieving files from the ComfyUI storage.
  remote: RemoteFileAPIBase
  comfy_api_url: str

  # This should be the workflow json as a dict.
  workflow_template_dict: dict
  # This should begin as a deep copy of the template.
  workflow_dict: dict
  # This will hold the node ids that we must have results for.
  important: List[APINodeID]

  # Make this any string unique to this job.
  job_id: str

  # When the job is complete, this will be the `/history` json/dictionary for
  # this job.
  job_history_dict: Optional[dict]

  # These are inputs that modify this particular workflow.
  ckpt_name: Optional[str]
  positive_prompt: str
  negative_prompt: str
  # For this particular workflow, this will define the path to the output image.
  output_path: Path

async def RunExampleWorkflow(*, job_info: ExampleWorkflowInfo):

  # You have to write this function, to change the workflow_dict as you like.
  await PrepareWorkflow(job_info=job_info)

  job_id: str = job_info.job_id
  workflow_dict: dict = job_info.workflow_dict
  important: List[APINodeID] = job_info.important

  # Here the magic happens, the job is submitted to the ComfyUI server.
  status, future = await job_info.catapult.Catapult(
      job_id=job_id,
      prepared_workflow=workflow_dict,
      important=important,
      use_future_api=True)

  # Wait for the job to complete.
  while not future.done():
    status, _ = await job_info.catapult.GetStatus(job_id=job_id)
    print(f'status: {status}', file=sys.stderr)
    await asyncio.sleep(3)

  job_info.job_history_dict = await future

  # Now that the job is done, you have to write something that will go and get
  # the results you care about, if necessary.
  await DownloadResults(job_info=job_info)

Exporting workflows in the API json format

In ComfyUI web interface:

1. Open settings (gear box in the corner).
2. Enable the ability to export in the API format, Enable Dev mode Options.
3. Click new menu item Save (API format).

Example workflow: Prepare ComfyUI

If you don't want to try the example workflow, you can skip this section.

You need to get sd_xl_turbo_1.0_fp16.safetensors into the ComfyUI model directory.

Hugging Face page: huggingface.co/stabilityai/sdxl-turbo/blob/main/sd_xl_turbo_1.0_fp16.safetensors.

Direct download link: huggingface.co/stabilityai/sdxl-turbo/resolve/main/sd_xl_turbo_1.0_fp16.safetensors.

Download the example workflow, and export it in the API format

This is optional, you can use the example workflow in test_data/ instead and skip this step.

# Download the workflow:
wget https://github.com/comfyanonymous/ComfyUI_examples/raw/master/sdturbo/sdxlturbo_example.png

# 1. Open the Workflow in ComfyUI and export it. AFAIK there isn't a nice way
# to automated this right now.
#
# 2, Save to `./sdxlturbo_example_api.json`.
#
# Or just use `test_data/sdxlturbo_example_api.json`.

Run the examples

# If you set this environment variable, you don't have to specify it as an
# argument.
export COMFY_API_URL=http://127.0.0.1:8188
# Note, in WSL2 you may have to use the IP of the host to connect to ComfyUI.


python -m comfy_catapult.examples.sdxlturbo_example_catapulter \
  --api_workflow_json_path "$PWD/sdxlturbo_example_api.json" \
  --tmp_path "$PWD/.deleteme/tmp/" \
  --output_path "$PWD/.deleteme/output.png" \
  --positive_prompt "amazing cloudscape, towering clouds, thunderstorm, awe" \
  --negative_prompt "dull, blurry, nsfw"

# Optional if you don't want to set the environment variable:
#   --comfy_api_url "..."

# Done! Now $PWD/.deleteme/output.png should contain the output image.

# Some other examples:
python -m comfy_catapult.examples.add_a_node
python -m comfy_catapult.examples.using_pydantic

🤖 API

• Examine ./examples/sdxlturbo_example_catapulter.py to see how to use the main ComfyCatapult library.
• Examine ./test_data/sdxlturbo_example_api.json to see the API format. This will be necessary in order to programmatically set the proper inputs for the workflow.
  • (Optional) See ./examples/using_pydantic.py for how to parse the API format into the Pydantic models schema for easier navigation.
  • (Optional) See ./examples/add_a_node.py for how to add a new node to a workflow. This is useful when you need to add nodes at runtime (such as adding a bunch of LoadImage nodes).
• See ./comfy_catapult/catapult_base.py for the main library interface.
• (Optional) See ./comfy_catapult/catapult.py for the main library implementation.
• (Optional) See ./comfy_catapult/api_client_base.py for the direct ComfyUI API endpoint client library interface; you don't need to use this usually.
• (Optional) For those who want to do use the raw API themselves and learn how it works: Examine ./comfy_catapult/api_client.py to see the API client implementation if you want to directly interface with ComfyUI endpoints yourself.
  • (Optional) Also see ComfyUI/server.py (pinned to a specific commit) for the server @routes endpoint implementations.

Parsing the API format into the Pydantic models schema for easier navigation

From ./examples/using_pydantic.py:

from comfy_catapult.comfy_schema import APIWorkflow

api_workflow_json_str: str = """
{
  "1": {
    "inputs": {
      "image": "{remote_image_path} [input]",
      "upload": "image"
    },
    "class_type": "LoadImage",
    "_meta": {
      "title": "My Loader Title"
    }
  },
  "25": {
    "inputs": {
      "images": [
        "8",
        0
      ]
    },
    "class_type": "PreviewImage",
    "_meta": {
      "title": "Preview Image"
    }
  }
}
"""
api_workflow: APIWorkflow = APIWorkflow.model_validate_json(
    api_workflow_json_str)

# Or, if you have a APIWorkflow, and you want to deal with a dict instead:
api_workflow_dict = api_workflow.model_dump()

# Or, back to json:
api_workflow_json = api_workflow.model_dump_json()

# See comfy_catapult/comfyui_schema.py for the schema definition.

print(api_workflow_json)

Adding a new node to a workflow

From examples/add_a_node.py:

from pathlib import Path

from comfy_catapult.comfy_schema import (APIWorkflow, APIWorkflowNodeInfo,
                                         APIWorkflowNodeMeta)
from comfy_catapult.comfy_utils import GenerateNewNodeID

api_workflow_json_str: str = """
{
  "1": {
    "inputs": {
      "image": "{remote_image_path} [input]",
      "upload": "image"
    },
    "class_type": "LoadImage",
    "_meta": {
      "title": "My Loader Title"
    }
  },
  "25": {
    "inputs": {
      "images": [
        "8",
        0
      ]
    },
    "class_type": "PreviewImage",
    "_meta": {
      "title": "Preview Image"
    }
  }
}
"""
api_workflow: APIWorkflow = APIWorkflow.model_validate_json(
    api_workflow_json_str)

path_to_comfy_input = Path('/path/to/ComfyUI/input')
path_to_image = path_to_comfy_input / 'image.jpg'
rel_path_to_image = path_to_image.relative_to(path_to_comfy_input)

# Add a new LoadImage node to the workflow.
new_node_id = GenerateNewNodeID(workflow=api_workflow)
api_workflow.root[new_node_id] = APIWorkflowNodeInfo(
    inputs={
        'image': f'{rel_path_to_image} [input]',
        'upload': 'image',
    },
    class_type='LoadImage',
    _meta=APIWorkflowNodeMeta(title='My Loader Title'))

print(api_workflow.model_dump_json())

💻 Command Line Options

Options:

execute options:

Example usage:

python -m comfy_catapult.cli \
    execute --workflow-path ./test_data/sdxlturbo_example_api.json

✅ Requirements

• Python 3.10+
• ComfyUI server with API endpoint enabled.

Known to work on

• WSL2/Windows11, Ubuntu 22.04.2 LTS: Python 3.8.0.
• Ubuntu 20.04, Python 3.8.0, 3.9.0, 3.10.0, 3.11.0, 3.12.0, tested in GitHub Actions workflow (./.github/workflows/build-and-test.yml).

🐳 Docker Image

Docker images are published to ghcr.io/realazthat/comfy-catapult at each tag.

# Use the published images at https://ghcr.io/realazthat/comfy-catapult.
docker run --rm --tty ghcr.io/realazthat/comfy-catapult:v3.0.0 --help

# /data in the docker image is the working directory, so paths are simpler.
docker run --rm --tty \
  -v "${PWD}:/data" \
  -e "COMFY_API_URL=${COMFY_API_URL}" \
  ghcr.io/realazthat/comfy-catapult:v3.0.0 \
  execute --workflow-path ./test_data/sdxlturbo_example_api.json

If you want to build the image yourself, you can use the Dockerfile in the repository.

# Build the docker image.
docker build -t my-comfy-catapult-image .

# Print usage.
docker run --rm --tty my-comfy-catapult-image --help

# /data in the docker image is the working directory, so paths are simpler.
docker run --rm --tty \
  -v "${PWD}:/data" \
  -e "COMFY_API_URL=${COMFY_API_URL}" \
  my-comfy-catapult-image \
  execute --workflow-path ./test_data/sdxlturbo_example_api.json

🚸 Limitations

• Interrupting a job will interrupt any job, not the specific job interrupted. See #5.

TODO

• Helpers should support remote/cloud storage for ComfyUI input/output/model directories (Currently only supports local paths).
• ETA Estimator.
• Make sure the schema can parse the formats even if the format adds new fields.

Contributions

Development environment: Linux-like

• For running pre.sh (Linux-like environment).

  • From ./.github/dependencies.yml, which is used for the GH Action to do a fresh install of everything:

    bash: scripts.
    findutils: scripts.
    grep: tests.
    xxd: tests.
    git: scripts, tests.
    xxhash: scripts (changeguard).
    rsync: out-of-directory test.
    jq: dependency for [yq](https://github.com/kislyuk/yq), which is used to generate
      the README; the README generator needs to use `tomlq` (which is a part of `yq`)
      to query `pyproject.toml`.
    

  • Requires pyenv, or an exact matching version of python as in ./.python-version.

  • jq, (installation) required for yq, which is itself required for our ./README.md generation, which uses tomlq (from the yq package) to include version strings from ./pyproject.toml.

  • act (to run the GH Action locally):

    • Requires nodejs.
    • Requires Go.
    • docker.

  • Generate animation:

    • docker

  • docker (for building the docker image).

Commit Process

1. (Optionally) Fork the develop branch.
2. Stage your files: git add path/to/file.py.
3. bash scripts/pre.sh, this will format, lint, and test the code.
4. git status check if anything changed (generated ./README.md for example), if so, git add the changes, and go back to the previous step.
5. git commit -m "...".
6. Make a PR to develop (or push to develop if you have the rights).

Release Process

These instructions are for maintainers of the project.

1. develop branch: Run bash ./scripts/pre.sh to ensure everything is in order.
2. develop branch: Bump the version in ./pyproject.toml, following semantic versioning principles. Also modify the last_release and last_stable_release in the [tool.comfy_catapult-project-metadata] table as appropriate.
3. develop branch: Commit these changes with a message like "Prepare release X.Y.Z". (See the contributions section above).
4. master branch: Merge the develop branch into the master branch: git checkout master && git merge develop --no-ff.
5. master branch: Tag the release: Create a git tag for the release with git tag -a vX.Y.Z -m "Version X.Y.Z".
6. Publish to PyPI: Publish the release to PyPI with bash ./scripts/utilities/deploy-to-pypi.sh.
7. Push to GitHub: Push the commit and tags to GitHub with git push and git push --tags.
8. git checkout develop && git merge master The --no-ff option adds a commit to the master branch for the merge, so refork the develop branch from the master branch.
9. git push origin develop Push the develop branch to GitHub.