pygui revamped progress bar functionality into app task calls to simplify and commonize the functionality, handle and display task exceptions

daemon/core/api/grpc/server.py

@@ -297,7 +297,6 @@ class CoreGrpcServer(core_pb2_grpc.CoreApiServicer):
                 for service_exception in boot_exception.args:
                     exceptions.append(str(service_exception))
             return core_pb2.StartSessionResponse(result=False, exceptions=exceptions)
-
         return core_pb2.StartSessionResponse(result=True)
 
     def StopSession(

daemon/core/gui/app.py

@@ -1,6 +1,8 @@
 import math
+import time
 import tkinter as tk
 from tkinter import font, ttk
+from tkinter.ttk import Progressbar
 
 from core.gui import appconfig, themes
 from core.gui.coreclient import CoreClient
@@ -9,6 +11,7 @@ from core.gui.images import ImageEnum, Images
 from core.gui.menubar import Menubar
 from core.gui.nodeutils import NodeUtils
 from core.gui.statusbar import StatusBar
+from core.gui.task import ProgressTask
 from core.gui.toolbar import Toolbar
 from core.gui.validation import InputValidation
 
@@ -29,6 +32,8 @@ class Application(ttk.Frame):
         self.canvas = None
         self.statusbar = None
         self.validation = None
+        self.progress = None
+        self.time = None
 
         # fonts
         self.fonts_size = None
@@ -93,6 +98,7 @@ class Application(ttk.Frame):
         self.right_frame.grid(row=0, column=1, sticky="nsew")
         self.draw_canvas()
         self.draw_status()
+        self.progress = Progressbar(self.right_frame, mode="indeterminate")
         self.menubar = Menubar(self.master, self)
 
     def draw_canvas(self):
@@ -117,6 +123,21 @@ class Application(ttk.Frame):
         self.statusbar = StatusBar(self.right_frame, self)
         self.statusbar.grid(sticky="ew")
 
+    def progress_task(self, task: ProgressTask) -> None:
+        self.progress.grid(sticky="ew")
+        self.progress.start()
+        self.time = time.perf_counter()
+        task.app = self
+        task.start()
+
+    def progress_task_complete(self) -> None:
+        self.progress.stop()
+        self.progress.grid_forget()
+        total = time.perf_counter() - self.time
+        self.time = None
+        message = f"Task ran for {total:.3f} seconds"
+        self.statusbar.set_status(message)
+
     def on_closing(self):
         self.menubar.prompt_save_running_session(True)
 
@@ -124,7 +145,6 @@ class Application(ttk.Frame):
         appconfig.save(self.guiconfig)
 
     def joined_session_update(self):
-        self.statusbar.progress_bar.stop()
         if self.core.is_runtime():
             self.toolbar.set_runtime()
         else:

daemon/core/gui/dialogs/sessions.py

@@ -9,7 +9,7 @@ from core.api.grpc import core_pb2
 from core.gui.dialogs.dialog import Dialog
 from core.gui.errors import show_grpc_error
 from core.gui.images import ImageEnum, Images
-from core.gui.task import BackgroundTask
+from core.gui.task import ProgressTask
 from core.gui.themes import PADX, PADY
 
 if TYPE_CHECKING:
@@ -183,12 +183,11 @@ class SessionsDialog(Dialog):
         self.join_session(self.selected_session)
 
     def join_session(self, session_id: int) -> None:
+        self.destroy()
         if self.app.core.xml_file:
             self.app.core.xml_file = None
-        self.app.statusbar.progress_bar.start(5)
+        task = ProgressTask(self.app.core.join_session, args=(session_id,))
-        task = BackgroundTask(self.app, self.app.core.join_session, args=(session_id,))
+        self.app.progress_task(task)
-        task.start()
-        self.destroy()
 
     def double_click_join(self, _event: tk.Event) -> None:
         item = self.tree.selection()
@@ -201,7 +200,6 @@ class SessionsDialog(Dialog):
         if not self.selected_session:
             return
         logging.debug("delete session: %s", self.selected_session)
-        # self.app.core.delete_session(self.selected_id, self.top)
         self.tree.delete(self.selected_id)
         self.app.core.delete_session(self.selected_session)
         if self.selected_session == self.app.core.session_id:

daemon/core/gui/errors.py

@@ -43,7 +43,12 @@ class ErrorDialog(Dialog):
         button.grid(sticky="ew")
 
 
-def show_grpc_error(e: grpc.RpcError, master, app: "Application"):
+def show_exception(app: "Application", title: str, exception: Exception) -> None:
+    dialog = ErrorDialog(app, app, title, str(exception))
+    dialog.show()
+
+
+def show_grpc_error(e: grpc.RpcError, master, app: "Application") -> None:
     title = [x.capitalize() for x in e.code().name.lower().split("_")]
     title = " ".join(title)
     title = f"GRPC {title}"
@@ -51,8 +56,6 @@ def show_grpc_error(e: grpc.RpcError, master, app: "Application"):
     dialog.show()
 
 
-def show_grpc_response_exceptions(class_name, exceptions, master, app: "Application"):
+def show_error(app: "Application", title: str, message: str) -> None:
-    title = f"Exceptions from {class_name}"
+    dialog = ErrorDialog(app, app, title, message)
-    detail = "\n".join([str(x) for x in exceptions])
-    dialog = ErrorDialog(master, app, title, detail)
     dialog.show()

daemon/core/gui/menubar.py

@@ -22,7 +22,7 @@ from core.gui.dialogs.sessionoptions import SessionOptionsDialog
 from core.gui.dialogs.sessions import SessionsDialog
 from core.gui.dialogs.throughput import ThroughputDialog
 from core.gui.nodeutils import ICON_SIZE
-from core.gui.task import BackgroundTask
+from core.gui.task import ProgressTask
 
 if TYPE_CHECKING:
     from core.gui.app import Application
@@ -340,9 +340,8 @@ class Menubar(tk.Menu):
         self.core.xml_file = filename
         self.core.xml_dir = str(os.path.dirname(filename))
         self.prompt_save_running_session()
-        self.app.statusbar.progress_bar.start(5)
+        task = ProgressTask(self.core.open_xml, args=(filename,))
-        task = BackgroundTask(self.app, self.core.open_xml, args=(filename,))
+        self.app.progress_task(task)
-        task.start()
 
     def execute_python(self):
         dialog = ExecutePythonDialog(self.app, self.app)

daemon/core/gui/statusbar.py

@@ -18,7 +18,6 @@ class StatusBar(ttk.Frame):
         self.app = app
         self.status = None
         self.statusvar = tk.StringVar()
-        self.progress_bar = None
         self.zoom = None
         self.cpu_usage = None
         self.memory = None
@@ -28,19 +27,14 @@ class StatusBar(ttk.Frame):
         self.draw()
 
     def draw(self):
-        self.columnconfigure(0, weight=1)
+        self.columnconfigure(0, weight=7)
-        self.columnconfigure(1, weight=5)
+        self.columnconfigure(1, weight=1)
         self.columnconfigure(2, weight=1)
         self.columnconfigure(3, weight=1)
-        self.columnconfigure(4, weight=1)
 
         frame = ttk.Frame(self, borderwidth=1, relief=tk.RIDGE)
         frame.grid(row=0, column=0, sticky="ew")
         frame.columnconfigure(0, weight=1)
-        self.progress_bar = ttk.Progressbar(
-            frame, orient="horizontal", mode="indeterminate"
-        )
-        self.progress_bar.grid(sticky="ew")
 
         self.status = ttk.Label(
             self,
@@ -49,7 +43,7 @@ class StatusBar(ttk.Frame):
             borderwidth=1,
             relief=tk.RIDGE,
         )
-        self.status.grid(row=0, column=1, sticky="ew")
+        self.status.grid(row=0, column=0, sticky="ew")
 
         self.zoom = ttk.Label(
             self,
@@ -58,17 +52,17 @@ class StatusBar(ttk.Frame):
             borderwidth=1,
             relief=tk.RIDGE,
         )
-        self.zoom.grid(row=0, column=2, sticky="ew")
+        self.zoom.grid(row=0, column=1, sticky="ew")
 
         self.cpu_usage = ttk.Label(
             self, text="CPU TBD", anchor=tk.CENTER, borderwidth=1, relief=tk.RIDGE
         )
-        self.cpu_usage.grid(row=0, column=3, sticky="ew")
+        self.cpu_usage.grid(row=0, column=2, sticky="ew")
 
         self.alerts_button = ttk.Button(
             self, text="Alerts", command=self.click_alerts, style=Styles.green_alert
         )
-        self.alerts_button.grid(row=0, column=4, sticky="ew")
+        self.alerts_button.grid(row=0, column=3, sticky="ew")
 
     def click_alerts(self):
         dialog = AlertsDialog(self.app, self.app)

daemon/core/gui/task.py

@@ -1,46 +1,39 @@
 import logging
 import threading
-from typing import Any, Callable
+from typing import Any, Callable, Tuple
 
-from core.gui.errors import show_grpc_response_exceptions
+from core.gui.errors import show_exception
 
 
-class BackgroundTask:
+class ProgressTask:
-    def __init__(self, master: Any, task: Callable, callback: Callable = None, args=()):
+    def __init__(
-        self.master = master
+        self, task: Callable, callback: Callable = None, args: Tuple[Any] = None
-        self.args = args
+    ):
+        self.app = None
         self.task = task
         self.callback = callback
-        self.thread = None
+        self.args = args
+        if self.args is None:
+            self.args = ()
 
-    def start(self):
+    def start(self) -> None:
-        logging.info("starting task")
+        thread = threading.Thread(target=self.run, daemon=True)
-        self.thread = threading.Thread(target=self.run, daemon=True)
+        thread.start()
-        self.thread.start()
 
-    def run(self):
+    def run(self) -> None:
-        result = self.task(*self.args)
+        logging.info("running task")
-        logging.info("task completed")
+        try:
-        # if start session fails, a response with Result: False and a list of
+            values = self.task(*self.args)
-        # exceptions is returned
+            if values is None:
-        if not getattr(result, "result", True):
+                values = ()
-            if len(getattr(result, "exceptions", [])) > 0:
+            elif values and not isinstance(values, tuple):
-                self.master.after(
+                values = (values,)
-                    0,
-                    show_grpc_response_exceptions,
-                    *(
-                        result.__class__.__name__,
-                        result.exceptions,
-                        self.master,
-                        self.master,
-                    )
-                )
             if self.callback:
-            if result is None:
+                logging.info("calling callback")
-                args = ()
+                self.app.after(0, self.callback, *values)
-            elif isinstance(result, (list, tuple)):
+        except Exception as e:
-                args = result
+            logging.exception("progress task exception")
-            else:
+            args = (self.app, "Task Error", e)
-                args = (result,)
+            self.app.after(0, show_exception, *args)
-            logging.info("calling callback: %s", args)
+        finally:
-            self.master.after(0, self.callback, *args)
+            self.app.after(0, self.app.progress_task_complete)

daemon/core/gui/toolbar.py

@@ -1,5 +1,4 @@
 import logging
-import time
 import tkinter as tk
 from enum import Enum
 from functools import partial
@@ -10,11 +9,12 @@ from core.api.grpc import core_pb2
 from core.gui.dialogs.customnodes import CustomNodesDialog
 from core.gui.dialogs.marker import MarkerDialog
 from core.gui.dialogs.runtool import RunToolDialog
+from core.gui.errors import show_error
 from core.gui.graph.enums import GraphMode
 from core.gui.graph.shapeutils import ShapeType, is_marker
 from core.gui.images import ImageEnum, Images
 from core.gui.nodeutils import NodeDraw, NodeUtils
-from core.gui.task import BackgroundTask
+from core.gui.task import ProgressTask
 from core.gui.themes import Styles
 from core.gui.tooltip import Tooltip
 
@@ -47,7 +47,6 @@ class Toolbar(ttk.Frame):
         """
         super().__init__(master, **kwargs)
         self.app = app
-        self.time = None
 
         # design buttons
         self.play_button = None
@@ -263,22 +262,18 @@ class Toolbar(ttk.Frame):
         server.
         """
         self.app.menubar.change_menubar_item_state(is_runtime=True)
-        self.app.statusbar.progress_bar.start(5)
         self.app.canvas.mode = GraphMode.SELECT
-        self.time = time.perf_counter()
+        task = ProgressTask(self.app.core.start_session, self.start_callback)
-        task = BackgroundTask(self, self.app.core.start_session, self.start_callback)
+        self.app.progress_task(task)
-        task.start()
 
     def start_callback(self, response: core_pb2.StartSessionResponse):
-        self.app.statusbar.progress_bar.stop()
-        total = time.perf_counter() - self.time
-        message = f"Start ran for {total:.3f} seconds"
-        self.app.statusbar.set_status(message)
-        self.time = None
         if response.result:
             self.set_runtime()
             self.app.core.set_metadata()
             self.app.core.show_mobility_players()
+        else:
+            message = "\n".join(response.exceptions)
+            show_error(self.app, "Start Session Error", message)
 
     def set_runtime(self):
         self.runtime_frame.tkraise()
@@ -450,19 +445,13 @@ class Toolbar(ttk.Frame):
         """
         redraw buttons on the toolbar, send node and link messages to grpc server
         """
-        logging.info("Click stop button")
+        logging.info("clicked stop button")
         self.app.menubar.change_menubar_item_state(is_runtime=False)
-        self.app.statusbar.progress_bar.start(5)
+        task = ProgressTask(self.app.core.stop_session, self.stop_callback)
-        self.time = time.perf_counter()
+        self.app.progress_task(task)
-        task = BackgroundTask(self, self.app.core.stop_session, self.stop_callback)
-        task.start()
 
     def stop_callback(self, response: core_pb2.StopSessionResponse):
-        self.app.statusbar.progress_bar.stop()
         self.set_design()
-        total = time.perf_counter() - self.time
-        message = f"Stopped in {total:.3f} seconds"
-        self.app.statusbar.set_status(message)
         self.app.canvas.stopped_session()
 
     def update_annotation(