From 31cecb5c905b7edfc2d689049bdf00c5601a9c47 Mon Sep 17 00:00:00 2001
From: Edward Betts <edward@4angle.com>
Date: Tue, 7 Jan 2020 14:29:52 +0000
Subject: [PATCH] Show arguments of last function during error.

---
 app.py                    | 6 +++++-
 templates/show_error.html | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/app.py b/app.py
index 525b23e..2598f0f 100755
--- a/app.py
+++ b/app.py
@@ -15,6 +15,7 @@ from sqlalchemy.orm import aliased
 from sqlalchemy.sql.expression import desc
 from collections import defaultdict
 from datetime import datetime
+import inspect
 import itertools
 import hashlib
 import json
@@ -79,7 +80,10 @@ def shutdown_session(exception=None):
 @app.errorhandler(InternalServerError)
 def exception_handler(e):
     tb = get_current_traceback()
-    return render_template('show_error.html', tb=tb), 500
+    last_frame_args = inspect.getargs(tb.frames[-1].code)
+    return render_template('show_error.html',
+                           tb=tb,
+                           last_frame_args=last_frame_args), 500
 
 @app.template_global()
 def set_url_args(endpoint=None, **new_args):
diff --git a/templates/show_error.html b/templates/show_error.html
index bfadc50..0c7a9af 100644
--- a/templates/show_error.html
+++ b/templates/show_error.html
@@ -9,7 +9,11 @@
 
 <h1>Software error: {{ tb.exception_type }}</h1>
 <div>
-  <p>{{ tb.exception }}</p>
+  <pre>{{ tb.exception }}</pre>
+
+<p>Error in function "{{ tb.frames[-1].function_name }}":
+   {{ last_frame_args | pprint }}</p>
+
 </div>
 
 {% set body %}