Merge pull request #31 from alex-oleshkevich/safe-str

examples/starlette.py

@@ -20,9 +20,18 @@ class WithHintError(Exception):
 
 
 def index_view(request: Request) -> typing.NoReturn:
+    class StrError:
+        """Value that raises exception during conversion to string."""
+
+        def __str__(self) -> str:
+            raise ValueError('hahaha crash <b>me</b>')
+
     token = 'mytoken'  # noqa
     request.state.token = 'mytoken'
+
     request.app.state.app_token = 'app mytoken'
+    request.state.error = StrError()
+    request.app.state.error = StrError()
     raise ValueError('This is the first cause')
 
 

starception/exception_handler.py

@@ -182,10 +182,18 @@ def highlight(value: str, filename: str) -> str:
         return markupsafe.escape(value)
 
 
+def save_str(value: typing.Any) -> str:
+    try:
+        return str(value)
+    except Exception as ex:
+        return Markup(f'<span class="text-error">ERROR</span>: {html.escape(str(ex))}')
+
+
 jinja = jinja2.Environment(loader=jinja2.PackageLoader(__name__))
 jinja.filters.update(
     {
         'symbol': get_symbol,
+        'save_str': save_str,
         'frame_id': frame_id,
         'is_vendor': is_vendor,
         'highlight': highlight,

starception/templates/lib.html

@@ -4,7 +4,7 @@
         {% for label, value in items.items() %}
             <dl>
                 <dt>{{ label }}</dt>
-                <dd>{{ value|mask_secrets(label)|escape }}</dd>
+                <dd>{{ value|save_str|mask_secrets(label)|escape }}</dd>
             </dl>
         {% else %}
             <dl>

starception/templates/styles.css

@@ -376,3 +376,7 @@ dd {
 .search-links a:hover {
     text-decoration: underline;
 }
+
+.text-error {
+    color: var(--red);
+}