Online canvas editor (StableCanvas) for ComfyUI, and some questions

[zhzLuke96]

Hello everyone, I've released an online AI drawing editor called StableCanvas, which can be used in conjunction with ComfyUI. For more details, you can refer to the README of the project.

Additionally, I have written a ComfyUI client for Javascript (which is also part of the editor's code):
https://github.com/StableCanvas/comfyui-client

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Besides just sharing this, I also have a few questions:

1. ComfyUI seems to be a bit different from common visual programming interfaces.
   I can't seem to find any controls for conditional statements and loops. Is this because I simply haven't found them, or do they actually not exist?

2. How does comfyui determine the start and end of a workflow?
   The main issue is, with API calls, I imagine that if you can set the logic for return values, such as encoding an image to base64, can this be implemented in the current API interface?

The my current process for API calls, for example, is:

• Initiate an API request, using the decode64 node to process base64 input.
• Polling history to wait for it to end.
• Then I get the image information {filename, subfolder, type}.
• And then retrieve the image from /view.

I wish to directly obtain the base64 encoding of the image during the API call itself, so polling would not be necessary.
Is there any way to achieve this?