improve error handling

Signed-off-by: Zen <[email protected]>

Author: desultory

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "json_exporter"
-version = "1.0.1"
+version = "1.0.2"
 authors = [
   { name="Desultory", email="[email protected]" },
 ]

src/json_exporter/json_endpoint.py

@@ -116,7 +116,10 @@ async def get_metrics(self, label_filter={}):
         try:
             await self.get_data()
         except JSONDecodeError:
-            self.logger.error("[%s] Failed to decode JSON data: %s" % (self.name, self.json_data))
+            if json_data := getattr(self, 'json_data', None):
+                self.logger.error("[%s] Failed to decode JSON data: %s" % (self.name, json_data))
+            else:
+                self.logger.error("[%s] Failed to decode JSON data." % self.name)
             return
         await self.update_json_labels()
         await self.populate_metrics()