Fixed broken error handling for long-running tasks

openflexure_microscope/plugins/example/api.py

@@ -72,5 +72,24 @@ class LongRunningAPI(MicroscopeViewPlugin):
             task = self.microscope.task.start(self.plugin.long_running, time_to_run)
             return jsonify(task.state), 202
 
+        except TaskDeniedException:
+            return abort(409)
+
+class SomeExceptionAPI(MicroscopeViewPlugin):
+    """
+    An example API plugin that uses a long-running but broken plugin method.
+    """
+    def post(self):
+        """
+        Method to call when an HTTP POST request is made.
+        """
+        # Get payload JSON
+        payload = JsonPayload(request)
+
+        # Attach the long-running method as a microscope task
+        try:
+            task = self.microscope.task.start(self.plugin.some_exception)
+            return jsonify(task.state), 202
+
         except TaskDeniedException:
             return abort(409)

openflexure_microscope/plugins/example/plugin.py

@@ -2,7 +2,7 @@ import random
 import time
 from openflexure_microscope.plugins import MicroscopePlugin
 
-from .api import IdentifyAPI, HelloWorldAPI, LongRunningAPI
+from .api import IdentifyAPI, HelloWorldAPI, LongRunningAPI, SomeExceptionAPI
 
 
 class Plugin(MicroscopePlugin):
@@ -14,6 +14,7 @@ class Plugin(MicroscopePlugin):
         '/identify': IdentifyAPI,
         '/hello': HelloWorldAPI,
         '/long_running': LongRunningAPI,
+        '/some_exception': SomeExceptionAPI,
     }
 
     def identify(self):
@@ -32,6 +33,16 @@ class Plugin(MicroscopePlugin):
 
         return "Hello world!"
 
+    def some_exception(self):
+        """
+        Demonstrate some broken plugin method that would be long running
+        """
+        with self.microscope.lock:
+            time.sleep(3)
+            result = 15./0
+
+        return result
+
     def long_running(self, t_run):
         """
         Demonstrate a long-running method that requires microscope hardware