Adding common sourceLabels func (#720)

* Adding common sourceLabels func

* fixing feedback from @mattmoor

* fixing typo

OWNERS_ALIASES

@@ -62,6 +62,10 @@ aliases:
   - steuhs
   - yt3liu
 
+  source-approvers:
+  - n3wscott
+  - vaikas-google
+
   webhook-approvers:
   - mattmoor
   - grantr

source/OWNERS

@@ -0,0 +1,4 @@
+# The OWNERS file is used by prow to automatically merge approved PRs.
+
+approvers:
+- source-approvers

source/doc.go

@@ -0,0 +1,18 @@
+/*
+Copyright 2019 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package source holds utilities for Source developers.
+package source

source/source_labels.go

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2019 The Knative Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package source
+
+const (
+	sourceControllerName = "sources.knative.dev/controller"
+	sourceName           = "sources.knative.dev/name"
+)
+
+func Labels(name, controllerAgentName string) map[string]string {
+	return map[string]string{
+		sourceControllerName: controllerAgentName,
+		sourceName:           name,
+	}
+}

source/source_labels_test.go

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2019 The Knative Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package source
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestLabels(t *testing.T) {
+
+	sourceLabeles := Labels("foo", "foo-source-controller")
+
+	wantTags := map[string]string{
+		sourceControllerName: "foo-source-controller",
+		sourceName:           "foo",
+	}
+
+	eq := cmp.Equal(sourceLabeles, wantTags)
+	if !eq {
+		t.Fatalf("%v is not equal to %v", sourceLabeles, wantTags)
+	}
+}