Add trigger update command

docs/cmd/kn_trigger.md

@@ -31,4 +31,5 @@ kn trigger [flags]
 * [kn trigger delete](kn_trigger_delete.md)	 - Delete a trigger.
 * [kn trigger describe](kn_trigger_describe.md)	 - Describe a trigger.
 * [kn trigger list](kn_trigger_list.md)	 - List available triggers.
+* [kn trigger update](kn_trigger_update.md)	 - Update a trigger
 

docs/cmd/kn_trigger_update.md

@@ -0,0 +1,49 @@
+## kn trigger update
+
+Update a trigger
+
+### Synopsis
+
+Update a trigger
+
+```
+kn trigger update NAME --filter KEY=VALUE --sink SINK [flags]
+```
+
+### Examples
+
+```
+
+  # Update the filter which key is 'type' to value 'knative.dev.bar' in a trigger 'mytrigger'
+  kn trigger update mytrigger --filter type=knative.dev.bar
+
+  # Remove the filter which key is 'type' from a trigger 'mytrigger' 
+  kn trigger update mytrigger --filter type-
+
+  # Update the sink of a trigger 'mytrigger' to 'svc:new-service'
+  kn trigger update mytrigger --sink svc:new-service
+
+```
+
+### Options
+
+```
+      --broker string      Name of the Broker which the trigger associates with. (default "default")
+      --filter []string    Key-value pair for exact CloudEvent attribute matching against incoming events, e.g type=dev.knative.foo
+  -h, --help               help for update
+  -n, --namespace string   Specify the namespace to operate in.
+  -s, --sink string        Addressable sink for events
+```
+
+### Options inherited from parent commands
+
+```
+      --config string       kn config file (default is $HOME/.kn/config.yaml)
+      --kubeconfig string   kubectl config file (default is $HOME/.kube/config)
+      --log-http            log http traffic
+```
+
+### SEE ALSO
+
+* [kn trigger](kn_trigger.md)	 - Trigger command group
+

pkg/eventing/v1alpha1/client.go

@@ -16,12 +16,14 @@ package v1alpha1
 
 import (
 	apis_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	kn_errors "knative.dev/client/pkg/errors"
 	"knative.dev/client/pkg/util"
 	"knative.dev/eventing/pkg/apis/eventing/v1alpha1"
 	"knative.dev/eventing/pkg/client/clientset/versioned/scheme"
 	client_v1alpha1 "knative.dev/eventing/pkg/client/clientset/versioned/typed/eventing/v1alpha1"
+	duckv1 "knative.dev/pkg/apis/duck/v1"
 )
 
 const (
@@ -41,6 +43,8 @@ type KnEventingClient interface {
 	GetTrigger(name string) (*v1alpha1.Trigger, error)
 	// ListTrigger returns list of trigger CRDs
 	ListTriggers() (*v1alpha1.TriggerList, error)
+	// UpdateTrigger is used to update an instance of trigger
+	UpdateTrigger(trigger *v1alpha1.Trigger) error
 }
 
 // KnEventingClient is a combination of Sources client interface and namespace
@@ -109,6 +113,15 @@ func (c *knEventingClient) ListTriggers() (*v1alpha1.TriggerList, error) {
 	return triggerListNew, nil
 }
 
+//CreateTrigger is used to create an instance of trigger
+func (c *knEventingClient) UpdateTrigger(trigger *v1alpha1.Trigger) error {
+	trigger, err := c.client.Triggers(c.namespace).Update(trigger)
+	if err != nil {
+		return kn_errors.GetError(err)
+	}
+	return nil
+}
+
 // Return the client's namespace
 func (c *knEventingClient) Namespace() string {
 	return c.namespace
@@ -118,3 +131,70 @@ func (c *knEventingClient) Namespace() string {
 func updateTriggerGvk(obj runtime.Object) error {
 	return util.UpdateGroupVersionKindWithScheme(obj, v1alpha1.SchemeGroupVersion, scheme.Scheme)
 }
+
+// TriggerBuilder is for building the trigger
+type TriggerBuilder struct {
+	trigger *v1alpha1.Trigger
+}
+
+// NewTriggerBuilder for building trigger object
+func NewTriggerBuilder(name string) *TriggerBuilder {
+	return &TriggerBuilder{trigger: &v1alpha1.Trigger{
+		ObjectMeta: meta_v1.ObjectMeta{
+			Name: name,
+		},
+	}}
+}
+
+// NewTriggerBuilderFromExisting for building the object from existing Trigger object
+func NewTriggerBuilderFromExisting(tr *v1alpha1.Trigger) *TriggerBuilder {
+	return &TriggerBuilder{trigger: tr.DeepCopy()}
+}
+
+// Broker to set the broker of trigger object
+func (b *TriggerBuilder) Broker(broker string) *TriggerBuilder {
+	if broker != "" {
+		b.trigger.Spec.Broker = broker
+	}
+	return b
+}
+
+// Filters to set the filters of trigger object
+func (b *TriggerBuilder) Filters(filters map[string]string) *TriggerBuilder {
+	if filters != nil {
+		triggerFilterAttributes := v1alpha1.TriggerFilterAttributes(filters)
+		b.trigger.Spec.Filter = &v1alpha1.TriggerFilter{
+			Attributes: &triggerFilterAttributes,
+		}
+	}
+	return b
+}
+
+// UpdateFilters to update the filters of trigger object
+func (b *TriggerBuilder) UpdateFilters(toUpdate map[string]string, toRemove []string) *TriggerBuilder {
+	if b.trigger.Spec.Filter == nil {
+		b.Filters(toUpdate)
+		return b
+	}
+
+	existing := map[string]string(*b.trigger.Spec.Filter.Attributes)
+	for key, value := range toUpdate {
+		existing[key] = value
+	}
+	for _, key := range toRemove {
+		delete(existing, key)
+	}
+	b.Filters(existing)
+	return b
+}
+
+// Sink to set the subscriber of trigger object
+func (b *TriggerBuilder) Sink(sink *duckv1.Destination) *TriggerBuilder {
+	b.trigger.Spec.Subscriber = sink
+	return b
+}
+
+// Build to return an instance of trigger object
+func (b *TriggerBuilder) Build() *v1alpha1.Trigger {
+	return b.trigger
+}

pkg/eventing/v1alpha1/client_mock.go

@@ -102,6 +102,17 @@ func (c *MockKnEventingClient) ListTriggers() (*v1alpha1.TriggerList, error) {
 	return call.Result[0].(*v1alpha1.TriggerList), mock.ErrorOrNil(call.Result[1])
 }
 
+// UpdateTrigger records a call for ListTriggers with the expected result and error (nil if none)
+func (sr *EventingRecorder) UpdateTrigger(trigger interface{}, err error) {
+	sr.r.Add("UpdateTrigger", []interface{}{trigger}, []interface{}{err})
+}
+
+// UpdateTrigger performs a previously recorded action
+func (c *MockKnEventingClient) UpdateTrigger(trigger *v1alpha1.Trigger) error {
+	call := c.recorder.r.VerifyCall("UpdateTrigger")
+	return mock.ErrorOrNil(call.Result[0])
+}
+
 // Validate validates whether every recorded action has been called
 func (sr *EventingRecorder) Validate() {
 	sr.r.CheckThatAllRecordedMethodsHaveBeenCalled()

pkg/eventing/v1alpha1/client_mock_test.go

@@ -31,12 +31,14 @@ func TestMockKnClient(t *testing.T) {
 	recorder.CreateTrigger(&v1alpha1.Trigger{}, nil)
 	recorder.DeleteTrigger("hello", nil)
 	recorder.ListTriggers(nil, nil)
+	recorder.UpdateTrigger(&v1alpha1.Trigger{}, nil)
 
 	// Call all service
 	client.GetTrigger("hello")
 	client.CreateTrigger(&v1alpha1.Trigger{})
 	client.DeleteTrigger("hello")
 	client.ListTriggers()
+	client.UpdateTrigger(&v1alpha1.Trigger{})
 
 	// Validate
 	recorder.Validate()

pkg/eventing/v1alpha1/client_test.go

@@ -128,22 +128,54 @@ func TestListTrigger(t *testing.T) {
 	})
 }
 
-func newTrigger(name string) *v1alpha1.Trigger {
-	obj := &v1alpha1.Trigger{
-		ObjectMeta: metav1.ObjectMeta{
-			Name:      name,
-			Namespace: testNamespace,
-		},
-		Spec: v1alpha1.TriggerSpec{
-			Broker: "default",
-			Filter: &v1alpha1.TriggerFilter{
-				Attributes: &v1alpha1.TriggerFilterAttributes{
-					"type": "foo",
-				},
+func TestTriggerBuilder(t *testing.T) {
+	a := NewTriggerBuilder("testtrigger")
+	a.Filters(map[string]string{"type": "foo", "source": "bar"})
+
+	t.Run("update filter", func(t *testing.T) {
+		b := NewTriggerBuilderFromExisting(a.Build())
+		assert.DeepEqual(t, b.Build(), a.Build())
+		b.UpdateFilters(map[string]string{"type": "new"}, []string{"source"})
+		expected := &v1alpha1.TriggerFilter{
+			Attributes: &v1alpha1.TriggerFilterAttributes{
+				"type": "new",
+			},
+		}
+		assert.DeepEqual(t, expected, b.Build().Spec.Filter)
+	})
+
+	t.Run("update filter with only deletions", func(t *testing.T) {
+		b := NewTriggerBuilderFromExisting(a.Build())
+		assert.DeepEqual(t, b.Build(), a.Build())
+		b.UpdateFilters(nil, []string{"source"})
+		expected := &v1alpha1.TriggerFilter{
+			Attributes: &v1alpha1.TriggerFilterAttributes{
+				"type": "foo",
+			},
+		}
+		assert.DeepEqual(t, expected, b.Build().Spec.Filter)
+	})
+
+	t.Run("update filter with only updates", func(t *testing.T) {
+		b := NewTriggerBuilderFromExisting(a.Build())
+		assert.DeepEqual(t, b.Build(), a.Build())
+		b.UpdateFilters(map[string]string{"type": "new"}, nil)
+		expected := &v1alpha1.TriggerFilter{
+			Attributes: &v1alpha1.TriggerFilterAttributes{
+				"type":   "new",
+				"source": "bar",
 			},
-		},
-	}
-	obj.Name = name
-	obj.Namespace = testNamespace
-	return obj
+		}
+		assert.DeepEqual(t, expected, b.Build().Spec.Filter)
+	})
+
+}
+
+func newTrigger(name string) *v1alpha1.Trigger {
+	b := NewTriggerBuilder(name)
+	b.Filters(map[string]string{"type": "foo"})
+	b.Broker("default")
+	b.trigger.Name = name
+	b.trigger.Namespace = testNamespace
+	return b.Build()
 }

pkg/kn/commands/trigger/create.go

@@ -67,7 +67,19 @@ func NewTriggerCreateCommand(p *commands.KnParams) *cobra.Command {
 						"because %s", name, namespace, err)
 			}
 
-			trigger := constructTrigger(name, namespace, triggerUpdateFlags)
+			filters, err := triggerUpdateFlags.GetFilters()
+			if err != nil {
+				return fmt.Errorf(
+					"cannot create trigger '%s' "+
+						"because %s", name, err)
+			}
+			if filters == nil {
+				return fmt.Errorf(
+					"cannot create trigger '%s' "+
+						"because filters are required", name)
+			}
+
+			trigger := constructTrigger(name, namespace, triggerUpdateFlags.Broker, filters)
 			trigger.Spec.Subscriber = &duckv1.Destination{
 				Ref: objectRef.Ref,
 				URI: objectRef.URI,
@@ -87,28 +99,26 @@ func NewTriggerCreateCommand(p *commands.KnParams) *cobra.Command {
 	triggerUpdateFlags.Add(cmd)
 	sinkFlags.Add(cmd)
 	cmd.MarkFlagRequired("sink")
+	cmd.MarkFlagRequired("filter")
 
 	return cmd
 }
 
 // constructTrigger is to create an instance of v1alpha1.Trigger
-func constructTrigger(name string, namespace string, flags TriggerUpdateFlags) *v1alpha1.Trigger {
+func constructTrigger(name string, namespace string, broker string, filters map[string]string) *v1alpha1.Trigger {
 	trigger := v1alpha1.Trigger{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      name,
 			Namespace: namespace,
 		},
 		Spec: v1alpha1.TriggerSpec{
-			Broker: flags.Broker,
+			Broker: broker,
 		},
 	}
 
-	filters := flags.GetFilters()
-	if filters != nil {
-		triggerFilterAttributes := v1alpha1.TriggerFilterAttributes(filters)
-		trigger.Spec.Filter = &v1alpha1.TriggerFilter{
-			Attributes: &triggerFilterAttributes,
-		}
+	triggerFilterAttributes := v1alpha1.TriggerFilterAttributes(filters)
+	trigger.Spec.Filter = &v1alpha1.TriggerFilter{
+		Attributes: &triggerFilterAttributes,
 	}
 
 	return &trigger

pkg/kn/commands/trigger/create_test.go

@@ -75,6 +75,13 @@ func TestNoSinkError(t *testing.T) {
 	assert.ErrorContains(t, err, "required flag(s)", "sink", "not set")
 }
 
+func TestNoFilterError(t *testing.T) {
+	eventingClient := eventing_client.NewMockKnEventingClient(t)
+	_, err := executeTriggerCommand(eventingClient, nil, "create", triggerName, "--broker", "mybroker",
+		"--sink", "svc:mysvc")
+	assert.ErrorContains(t, err, "required flag(s)", "filter", "not set")
+}
+
 func TestTriggerCreateMultipleFilter(t *testing.T) {
 	eventingClient := eventing_client.NewMockKnEventingClient(t)
 	servingClient := knserving_client.NewMockKnServiceClient(t)

pkg/kn/commands/trigger/trigger.go

@@ -27,8 +27,9 @@ func NewTriggerCommand(p *commands.KnParams) *cobra.Command {
 		Short: "Trigger command group",
 	}
 	triggerCmd.AddCommand(NewTriggerCreateCommand(p))
-	triggerCmd.AddCommand(NewTriggerDeleteCommand(p))
+	triggerCmd.AddCommand(NewTriggerUpdateCommand(p))
 	triggerCmd.AddCommand(NewTriggerDescribeCommand(p))
 	triggerCmd.AddCommand(NewTriggerListCommand(p))
+	triggerCmd.AddCommand(NewTriggerDeleteCommand(p))
 	return triggerCmd
 }