From 717b786256caecc4398d69277beae363183a5e74 Mon Sep 17 00:00:00 2001
From: Fred Clausen <43556888+fredclausen@users.noreply.github.com>
Date: Thu, 24 Oct 2024 09:57:47 -0600
Subject: [PATCH 1/3] use gevent async mode

---
 rootfs/webapp/acarshub.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rootfs/webapp/acarshub.py b/rootfs/webapp/acarshub.py
index 1bdf054b..fcf3736b 100755
--- a/rootfs/webapp/acarshub.py
+++ b/rootfs/webapp/acarshub.py
@@ -40,7 +40,7 @@
 # regarding async_handlers=True, see: https://github.com/miguelgrinberg/Flask-SocketIO/issues/348
 socketio = SocketIO(
     app,
-    async_mode=None,
+    async_mode="gevent",
     async_handlers=True,
     logger=False,
     engineio_logger=False,

From b1cacfba105a22c843cc298195c9bbfbcf2fe353 Mon Sep 17 00:00:00 2001
From: Fred Clausen <43556888+fredclausen@users.noreply.github.com>
Date: Thu, 24 Oct 2024 10:04:21 -0600
Subject: [PATCH 2/3] Use proper checking of background thread

---
 rootfs/webapp/acarshub.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rootfs/webapp/acarshub.py b/rootfs/webapp/acarshub.py
index fcf3736b..e220ffa2 100755
--- a/rootfs/webapp/acarshub.py
+++ b/rootfs/webapp/acarshub.py
@@ -483,7 +483,7 @@ def init_listeners(special_message=""):
         thread_scheduler.start()
 
     # check if 'g' is not in thread_html_generator
-    if not hasattr(thread_html_generator, "g"):
+    if not thread_html_generator.is_alive():
         acarshub_logging.log(
             f"{special_message}Starting htmlListener",
             "init",

From 924e85bd90a93a4c0a0808e81eea29ed5471c731 Mon Sep 17 00:00:00 2001
From: Fred Clausen <43556888+fredclausen@users.noreply.github.com>
Date: Thu, 24 Oct 2024 10:13:38 -0600
Subject: [PATCH 3/3] Do stupid things to see thread status

---
 rootfs/webapp/acarshub.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/rootfs/webapp/acarshub.py b/rootfs/webapp/acarshub.py
index e220ffa2..7c36cde5 100755
--- a/rootfs/webapp/acarshub.py
+++ b/rootfs/webapp/acarshub.py
@@ -56,6 +56,7 @@
 # thread for processing the incoming data
 
 thread_html_generator = Thread()
+thread_html_generator_active = False
 thread_html_generator_event = Event()
 
 # web thread
@@ -171,9 +172,12 @@ def getQueType(message_type):
 
 
 def htmlListener():
+    global thread_html_generator_active
     import time
     import sys
 
+    thread_html_generator_active = True
+
     # Run while requested...
     while not thread_html_generator_event.is_set():
         sys.stdout.flush()
@@ -190,6 +194,7 @@ def htmlListener():
     acarshub_logging.log(
         "Exiting HTML Listener thread", "htmlListener", level=LOG_LEVEL["DEBUG"]
     )
+    thread_html_generator_active = False
 
 
 def scheduled_tasks():
@@ -483,7 +488,7 @@ def init_listeners(special_message=""):
         thread_scheduler.start()
 
     # check if 'g' is not in thread_html_generator
-    if not thread_html_generator.is_alive():
+    if thread_html_generator_active is False:
         acarshub_logging.log(
             f"{special_message}Starting htmlListener",
             "init",
@@ -824,7 +829,7 @@ def main_connect():
         acarshub_logging.acars_traceback(e, "webapp")
 
     # Start the htmlGenerator thread only if the thread has not been started before.
-    if not hasattr(thread_html_generator, "g"):
+    if thread_html_generator_active is False:
         sys.stdout.flush()
         thread_html_generator_event.clear()
         thread_html_generator = socketio.start_background_task(htmlListener)