Add list_open_workflow_executions endpoint

moto/swf/models/__init__.py

@@ -61,6 +61,21 @@ class SWFBackend(BaseBackend):
             domains = reversed(domains)
         return domains
 
+    def list_open_workflow_executions(self, domain_name, start_time_filter,
+                                      maximum_page_size, reverse_order,
+                                      **kwargs):
+        self._process_timeouts()
+        domain = self._get_domain(domain_name)
+        if domain.status == "DEPRECATED":
+            raise SWFDomainDeprecatedFault(domain_name)
+        open_wfes = [
+            wfe for wfe in domain.workflow_executions
+            if wfe.execution_status == 'OPEN'
+        ]
+        if reverse_order:
+            open_wfes = reversed(open_wfes)
+        return open_wfes[0:maximum_page_size]
+
     def register_domain(self, name, workflow_execution_retention_period_in_days,
                         description=None):
         if self._get_domain(name, ignore_empty=True):

moto/swf/models/workflow_execution.py

@@ -146,6 +146,27 @@ class WorkflowExecution(object):
             hsh["latestActivityTaskTimestamp"] = self.latest_activity_task_timestamp
         return hsh
 
+    def to_list_dict(self):
+        hsh = {
+            'execution': {
+                'workflowId': self.workflow_id,
+                'runId': self.run_id,
+            },
+            'workflowType': self.workflow_type.to_short_dict(),
+            'startTimestamp': self.start_timestamp,
+            'executionStatus': self.execution_status,
+            'cancelRequested': self.cancel_requested,
+        }
+        if self.tag_list:
+            hsh['tagList'] = self.tag_list
+        if self.parent:
+            hsh['parent'] = self.parent
+        if self.close_status:
+            hsh['closeStatus'] = self.close_status
+        if self.close_timestamp:
+            hsh['closeTimestamp'] = self.close_timestamp
+        return hsh
+
     def _process_timeouts(self):
         """
         SWF timeouts can happen on different objects (workflow executions,