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import sys
import traceback
from collections import namedtuple
import inspect
from typing import Optional
from fastapi import FastAPI
from gradio import Blocks
def report_exception(c, job):
print(f"Error executing callback {job} for {c.script}", file=sys.stderr)
print(traceback.format_exc(), file=sys.stderr)
class ImageSaveParams:
def __init__(self, image, p, filename, pnginfo):
self.image = image
"""the PIL image itself"""
self.p = p
"""p object with processing parameters; either StableDiffusionProcessing or an object with same fields"""
self.filename = filename
"""name of file that the image would be saved to"""
self.pnginfo = pnginfo
"""dictionary with parameters for image's PNG info data; infotext will have the key 'parameters'"""
class CFGDenoiserParams:
def __init__(self, x, image_cond, sigma, sampling_step, total_sampling_steps):
self.x = x
"""Latent image representation in the process of being denoised"""
self.image_cond = image_cond
"""Conditioning image"""
self.sigma = sigma
"""Current sigma noise step value"""
self.sampling_step = sampling_step
"""Current Sampling step number"""
self.total_sampling_steps = total_sampling_steps
"""Total number of sampling steps planned"""
class UiTrainTabParams:
def __init__(self, txt2img_preview_params):
self.txt2img_preview_params = txt2img_preview_params
ScriptCallback = namedtuple("ScriptCallback", ["script", "callback"])
callback_map = dict(
callbacks_app_started=[],
callbacks_model_loaded=[],
callbacks_ui_tabs=[],
callbacks_ui_train_tabs=[],
callbacks_ui_settings=[],
callbacks_before_image_saved=[],
callbacks_image_saved=[],
callbacks_cfg_denoiser=[],
callbacks_before_component=[],
callbacks_after_component=[],
)
def clear_callbacks():
for callback_list in callback_map.values():
callback_list.clear()
def app_started_callback(demo: Optional[Blocks], app: FastAPI):
for c in callback_map['callbacks_app_started']:
try:
c.callback(demo, app)
except Exception:
report_exception(c, 'app_started_callback')
def model_loaded_callback(sd_model):
for c in callback_map['callbacks_model_loaded']:
try:
c.callback(sd_model)
except Exception:
report_exception(c, 'model_loaded_callback')
def ui_tabs_callback():
res = []
for c in callback_map['callbacks_ui_tabs']:
try:
res += c.callback() or []
except Exception:
report_exception(c, 'ui_tabs_callback')
return res
def ui_train_tabs_callback(params: UiTrainTabParams):
for c in callback_map['callbacks_ui_train_tabs']:
try:
c.callback(params)
except Exception:
report_exception(c, 'callbacks_ui_train_tabs')
def ui_settings_callback():
for c in callback_map['callbacks_ui_settings']:
try:
c.callback()
except Exception:
report_exception(c, 'ui_settings_callback')
def before_image_saved_callback(params: ImageSaveParams):
for c in callback_map['callbacks_before_image_saved']:
try:
c.callback(params)
except Exception:
report_exception(c, 'before_image_saved_callback')
def image_saved_callback(params: ImageSaveParams):
for c in callback_map['callbacks_image_saved']:
try:
c.callback(params)
except Exception:
report_exception(c, 'image_saved_callback')
def cfg_denoiser_callback(params: CFGDenoiserParams):
for c in callback_map['callbacks_cfg_denoiser']:
try:
c.callback(params)
except Exception:
report_exception(c, 'cfg_denoiser_callback')
def before_component_callback(component, **kwargs):
for c in callback_map['callbacks_before_component']:
try:
c.callback(component, **kwargs)
except Exception:
report_exception(c, 'before_component_callback')
def after_component_callback(component, **kwargs):
for c in callback_map['callbacks_after_component']:
try:
c.callback(component, **kwargs)
except Exception:
report_exception(c, 'after_component_callback')
def add_callback(callbacks, fun):
stack = [x for x in inspect.stack() if x.filename != __file__]
filename = stack[0].filename if len(stack) > 0 else 'unknown file'
callbacks.append(ScriptCallback(filename, fun))
def remove_current_script_callbacks():
stack = [x for x in inspect.stack() if x.filename != __file__]
filename = stack[0].filename if len(stack) > 0 else 'unknown file'
if filename == 'unknown file':
return
for callback_list in callback_map.values():
for callback_to_remove in [cb for cb in callback_list if cb.script == filename]:
callback_list.remove(callback_to_remove)
def remove_callbacks_for_function(callback_func):
for callback_list in callback_map.values():
for callback_to_remove in [cb for cb in callback_list if cb.callback == callback_func]:
callback_list.remove(callback_to_remove)
def on_app_started(callback):
"""register a function to be called when the webui started, the gradio `Block` component and
fastapi `FastAPI` object are passed as the arguments"""
add_callback(callback_map['callbacks_app_started'], callback)
def on_model_loaded(callback):
"""register a function to be called when the stable diffusion model is created; the model is
passed as an argument"""
add_callback(callback_map['callbacks_model_loaded'], callback)
def on_ui_tabs(callback):
"""register a function to be called when the UI is creating new tabs.
The function must either return a None, which means no new tabs to be added, or a list, where
each element is a tuple:
(gradio_component, title, elem_id)
gradio_component is a gradio component to be used for contents of the tab (usually gr.Blocks)
title is tab text displayed to user in the UI
elem_id is HTML id for the tab
"""
add_callback(callback_map['callbacks_ui_tabs'], callback)
def on_ui_train_tabs(callback):
"""register a function to be called when the UI is creating new tabs for the train tab.
Create your new tabs with gr.Tab.
"""
add_callback(callback_map['callbacks_ui_train_tabs'], callback)
def on_ui_settings(callback):
"""register a function to be called before UI settings are populated; add your settings
by using shared.opts.add_option(shared.OptionInfo(...)) """
add_callback(callback_map['callbacks_ui_settings'], callback)
def on_before_image_saved(callback):
"""register a function to be called before an image is saved to a file.
The callback is called with one argument:
- params: ImageSaveParams - parameters the image is to be saved with. You can change fields in this object.
"""
add_callback(callback_map['callbacks_before_image_saved'], callback)
def on_image_saved(callback):
"""register a function to be called after an image is saved to a file.
The callback is called with one argument:
- params: ImageSaveParams - parameters the image was saved with. Changing fields in this object does nothing.
"""
add_callback(callback_map['callbacks_image_saved'], callback)
def on_cfg_denoiser(callback):
"""register a function to be called in the kdiffussion cfg_denoiser method after building the inner model inputs.
The callback is called with one argument:
- params: CFGDenoiserParams - parameters to be passed to the inner model and sampling state details.
"""
add_callback(callback_map['callbacks_cfg_denoiser'], callback)
def on_before_component(callback):
"""register a function to be called before a component is created.
The callback is called with arguments:
- component - gradio component that is about to be created.
- **kwargs - args to gradio.components.IOComponent.__init__ function
Use elem_id/label fields of kwargs to figure out which component it is.
This can be useful to inject your own components somewhere in the middle of vanilla UI.
"""
add_callback(callback_map['callbacks_before_component'], callback)
def on_after_component(callback):
"""register a function to be called after a component is created. See on_before_component for more."""
add_callback(callback_map['callbacks_after_component'], callback)
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