Add events.list_event_buses

IMPLEMENTATION_COVERAGE.md

@@ -2713,7 +2713,7 @@
 - [ ] upgrade_elasticsearch_domain
 
 ## events
-51% implemented
+54% implemented
 - [ ] activate_event_source
 - [X] create_event_bus
 - [ ] create_partner_event_source
@@ -2727,7 +2727,7 @@
 - [X] describe_rule
 - [X] disable_rule
 - [X] enable_rule
-- [ ] list_event_buses
+- [X] list_event_buses
 - [ ] list_event_sources
 - [ ] list_partner_event_source_accounts
 - [ ] list_partner_event_sources

moto/events/models.py

@@ -344,6 +344,16 @@ class EventsBackend(BaseBackend):
 
         return self.event_buses[name]
 
+    def list_event_buses(self, name_prefix):
+        if name_prefix:
+            return [
+                event_bus
+                for event_bus in self.event_buses.values()
+                if event_bus.name.startswith(name_prefix)
+            ]
+
+        return list(self.event_buses.values())
+
 
 available_regions = boto3.session.Session().get_available_regions("events")
 events_backends = {region: EventsBackend(region) for region in available_regions}

moto/events/responses.py

@@ -278,3 +278,21 @@ class EventsHandler(BaseResponse):
         event_bus = self.events_backend.create_event_bus(name, event_source_name)
 
         return json.dumps({"EventBusArn": event_bus.arn}), self.response_headers
+
+    def list_event_buses(self):
+        name_prefix = self._get_param("NamePrefix")
+        # ToDo: add 'NextToken' & 'Limit' parameters
+
+        response = []
+        for event_bus in self.events_backend.list_event_buses(name_prefix):
+            event_bus_response = {
+                "Name": event_bus.name,
+                "Arn": event_bus.arn,
+            }
+
+            if event_bus.policy:
+                event_bus_response["Policy"] = event_bus.policy
+
+            response.append(event_bus_response)
+
+        return json.dumps({"EventBuses": response}), self.response_headers

tests/test_events/test_events.py

@@ -213,14 +213,14 @@ def test_put_permission_errors():
     client.put_permission.when.called_with(
         EventBusName="non-existing",
         Action="events:PutEvents",
-        Principal="762054135200",
+        Principal="111111111111",
         StatementId="test",
     ).should.throw(ClientError, "Event bus non-existing does not exist.")
 
     client.put_permission.when.called_with(
         EventBusName="test-bus",
         Action="events:PutPermission",
-        Principal="762054135200",
+        Principal="111111111111",
         StatementId="test",
     ).should.throw(
         ClientError, "Provided value in parameter 'action' is not supported."
@@ -243,7 +243,7 @@ def test_remove_permission_errors():
     client.put_permission(
         EventBusName="test-bus",
         Action="events:PutEvents",
-        Principal="762054135200",
+        Principal="111111111111",
         StatementId="test",
     )
 
@@ -322,7 +322,7 @@ def test_describe_event_bus():
     client.put_permission(
         EventBusName="test-bus",
         Action="events:PutEvents",
-        Principal="762054135200",
+        Principal="111111111111",
         StatementId="test",
     )
 
@@ -339,7 +339,7 @@ def test_describe_event_bus():
                 {
                     "Sid": "test",
                     "Effect": "Allow",
-                    "Principal": {"AWS": "arn:aws:iam::762054135200:root"},
+                    "Principal": {"AWS": "arn:aws:iam::111111111111:root"},
                     "Action": "events:PutEvents",
                     "Resource": "arn:aws:events:us-east-1:123456789012:event-bus/test-bus",
                 }
@@ -355,3 +355,63 @@ def test_describe_event_bus_errors():
     client.describe_event_bus.when.called_with(Name="non-existing").should.throw(
         ClientError, "Event bus non-existing does not exist."
     )
+
+
+@mock_events
+def test_list_event_buses():
+    client = boto3.client("events", "us-east-1")
+    client.create_event_bus(Name="test-bus-1")
+    client.put_permission(
+        EventBusName="test-bus-1",
+        Action="events:PutEvents",
+        Principal="111111111111",
+        StatementId="test",
+    )
+    client.create_event_bus(Name="test-bus-2")
+    client.create_event_bus(Name="other-bus-1")
+    client.create_event_bus(Name="other-bus-2")
+
+    response = client.list_event_buses()
+
+    response["EventBuses"].should.have.length_of(5)
+    sorted(response["EventBuses"], key=lambda i: i["Name"]).should.equal(
+        [
+            {
+                "Name": "default",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/default",
+            },
+            {
+                "Name": "other-bus-1",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/other-bus-1",
+            },
+            {
+                "Name": "other-bus-2",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/other-bus-2",
+            },
+            {
+                "Name": "test-bus-1",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/test-bus-1",
+                "Policy": '{"Version": "2012-10-17", "Statement": [{"Sid": "test", "Effect": "Allow", "Principal": {"AWS": "arn:aws:iam::111111111111:root"}, "Action": "events:PutEvents", "Resource": "arn:aws:events:us-east-1:123456789012:event-bus/test-bus-1"}]}',
+            },
+            {
+                "Name": "test-bus-2",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/test-bus-2",
+            },
+        ]
+    )
+
+    response = client.list_event_buses(NamePrefix="other-bus")
+
+    response["EventBuses"].should.have.length_of(2)
+    response["EventBuses"].should.equal(
+        [
+            {
+                "Name": "other-bus-1",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/other-bus-1",
+            },
+            {
+                "Name": "other-bus-2",
+                "Arn": "arn:aws:events:us-east-1:123456789012:event-bus/other-bus-2",
+            },
+        ]
+    )