From 423f22228306ae72d0480e25add9777c3c5d8fdf Mon Sep 17 00:00:00 2001
From: Maiko Tan <maiko.tan.coding@gmail.com>
Date: Sun, 30 Oct 2022 22:46:43 +0800
Subject: [PATCH 1/2] feat: add app started callback

---
 modules/script_callbacks.py | 15 +++++++++++++++
 webui.py                    |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/modules/script_callbacks.py b/modules/script_callbacks.py
index 6ea58d616..f5509629d 100644
--- a/modules/script_callbacks.py
+++ b/modules/script_callbacks.py
@@ -3,6 +3,8 @@ import traceback
 from collections import namedtuple
 import inspect
 
+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)
@@ -25,6 +27,7 @@ class ImageSaveParams:
 
 
 ScriptCallback = namedtuple("ScriptCallback", ["script", "callback"])
+callbacks_app_started = []
 callbacks_model_loaded = []
 callbacks_ui_tabs = []
 callbacks_ui_settings = []
@@ -40,6 +43,14 @@ def clear_callbacks():
     callbacks_image_saved.clear()
 
 
+def app_started_callback(demo: Blocks, app: FastAPI):
+    for c in 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 callbacks_model_loaded:
         try:
@@ -91,6 +102,10 @@ def add_callback(callbacks, fun):
     callbacks.append(ScriptCallback(filename, fun))
 
 
+def on_app_started(callback):
+    add_callback(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"""
diff --git a/webui.py b/webui.py
index 29530872c..13407e429 100644
--- a/webui.py
+++ b/webui.py
@@ -23,6 +23,7 @@ import modules.sd_hijack
 import modules.sd_models
 import modules.shared as shared
 import modules.txt2img
+import modules.script_callbacks
 
 import modules.ui
 from modules import devices
@@ -135,6 +136,8 @@ def webui():
         if (launch_api):
             create_api(app)
 
+        modules.script_callbacks.app_started_callback(demo, app)
+
         wait_on_server(demo)
 
         sd_samplers.set_samplers()

From 081df45da47feadfb055552c0ad5c6e6ecdd9f28 Mon Sep 17 00:00:00 2001
From: Maiko Sinkyaet Tan <maiko.tan.coding@gmail.com>
Date: Mon, 31 Oct 2022 08:47:43 +0800
Subject: [PATCH 2/2] docs: add python doc (?)

not sure if this available...
---
 modules/script_callbacks.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/script_callbacks.py b/modules/script_callbacks.py
index f5509629d..d8aa6f008 100644
--- a/modules/script_callbacks.py
+++ b/modules/script_callbacks.py
@@ -103,6 +103,8 @@ def add_callback(callbacks, fun):
 
 
 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(callbacks_app_started, callback)