custom_nodes/example_node.py.example

from typing_extensions import override

from comfy_api.latest import ComfyExtension, io


class Example(io.ComfyNode):
    """
    An example node

    Class methods
    -------------
    define_schema (io.Schema):
        Tell the main program the metadata, input, output parameters of nodes.
    fingerprint_inputs:
        optional method to control when the node is re executed.
    check_lazy_status:
        optional method to control list of input names that need to be evaluated.

    """

    @classmethod
    def define_schema(cls) -> io.Schema:
        """
            Return a schema which contains all information about the node.
            Some types: "Model", "Vae", "Clip", "Conditioning", "Latent", "Image", "Int", "String", "Float", "Combo".
            For outputs the "io.Model.Output" should be used, for inputs the "io.Model.Input" can be used.
            The type can be a "Combo" - this will be a list for selection.
        """
        return io.Schema(
            node_id="Example",
            display_name="Example Node",
            category="Example",
            inputs=[
                io.Image.Input("image"),
                io.Int.Input(
                    "int_field",
                    min=0,
                    max=4096,
                    step=64, # Slider's step
                    display_mode=io.NumberDisplay.number,  # Cosmetic only: display as "number" or "slider"
                    lazy=True,  # Will only be evaluated if check_lazy_status requires it
                ),
                io.Float.Input(
                    "float_field",
                    default=1.0,
                    min=0.0,
                    max=10.0,
                    step=0.01,
                    round=0.001, #The value representing the precision to round to, will be set to the step value by default. Can be set to False to disable rounding.
                    display_mode=io.NumberDisplay.number,
                    lazy=True,
                ),
                io.Combo.Input("print_to_screen", options=["enable", "disable"]),
                io.String.Input(
                    "string_field",
                    multiline=False,  # True if you want the field to look like the one on the ClipTextEncode node
                    default="Hello world!",
                    lazy=True,
                )
            ],
            outputs=[
                io.Image.Output(),
            ],
        )

    @classmethod
    def check_lazy_status(cls, image, string_field, int_field, float_field, print_to_screen):
        """
            Return a list of input names that need to be evaluated.

            This function will be called if there are any lazy inputs which have not yet been
            evaluated. As long as you return at least one field which has not yet been evaluated
            (and more exist), this function will be called again once the value of the requested
            field is available.

            Any evaluated inputs will be passed as arguments to this function. Any unevaluated
            inputs will have the value None.
        """
        if print_to_screen == "enable":
            return ["int_field", "float_field", "string_field"]
        else:
            return []

    @classmethod
    def execute(cls, image, string_field, int_field, float_field, print_to_screen) -> io.NodeOutput:
        if print_to_screen == "enable":
            print(f"""Your input contains:
                string_field aka input text: {string_field}
                int_field: {int_field}
                float_field: {float_field}
            """)
        #do some processing on the image, in this example I just invert it
        image = 1.0 - image
        return io.NodeOutput(image)

    """
        The node will always be re executed if any of the inputs change but
        this method can be used to force the node to execute again even when the inputs don't change.
        You can make this node return a number or a string. This value will be compared to the one returned the last time the node was
        executed, if it is different the node will be executed again.
        This method is used in the core repo for the LoadImage node where they return the image hash as a string, if the image hash
        changes between executions the LoadImage node is executed again.
    """
    #@classmethod
    #def fingerprint_inputs(s, image, string_field, int_field, float_field, print_to_screen):
    #    return ""

# Set the web directory, any .js file in that directory will be loaded by the frontend as a frontend extension
# WEB_DIRECTORY = "./somejs"


# Add custom API routes, using router
from aiohttp import web
from server import PromptServer

@PromptServer.instance.routes.get("/hello")
async def get_hello(request):
    return web.json_response("hello")


class ExampleExtension(ComfyExtension):
    @override
    async def get_node_list(self) -> list[type[io.ComfyNode]]:
        return [
            Example,
        ]


async def comfy_entrypoint() -> ExampleExtension:  # ComfyUI calls this to load your extension and its nodes.
    return ExampleExtension()