Retention: Implement Rule: Always Keep

Signed-off-by: Nathan Lowe <public@nlowe.me>

src/pkg/retention/policy/rule/always/evaluator.go

@@ -0,0 +1,50 @@
+// Copyright Project Harbor 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 always
+
+import (
+	"github.com/goharbor/harbor/src/pkg/retention/policy/action"
+	"github.com/goharbor/harbor/src/pkg/retention/policy/rule"
+	"github.com/goharbor/harbor/src/pkg/retention/res"
+)
+
+const (
+	// TemplateID of the always retain rule
+	TemplateID = "always"
+)
+
+type evaluator struct{}
+
+// Process for the "always" Evaluator simply returns the input with no error
+func (e *evaluator) Process(artifacts []*res.Candidate) ([]*res.Candidate, error) {
+	return artifacts, nil
+}
+
+func (e *evaluator) Action() string {
+	return action.Retain
+}
+
+// New returns an "always" Evaluator. It requires no parameters.
+func New(_ rule.Parameters) rule.Evaluator {
+	return &evaluator{}
+}
+
+func init() {
+	rule.Register(&rule.IndexMeta{
+		TemplateID: TemplateID,
+		Action:     action.Retain,
+		Parameters: []*rule.IndexedParam{},
+	}, New)
+}

src/pkg/retention/policy/rule/always/evaluator_test.go

@@ -0,0 +1,49 @@
+// Copyright Project Harbor 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 always
+
+import (
+	"testing"
+
+	"github.com/goharbor/harbor/src/pkg/retention/policy/rule"
+	"github.com/goharbor/harbor/src/pkg/retention/res"
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
+)
+
+type EvaluatorTestSuite struct {
+	suite.Suite
+}
+
+func (e *EvaluatorTestSuite) TestNew() {
+	sut := New(rule.Parameters{})
+
+	require.NotNil(e.T(), sut)
+	require.IsType(e.T(), &evaluator{}, sut)
+}
+
+func (e *EvaluatorTestSuite) TestProcess() {
+	sut := New(rule.Parameters{})
+	input := []*res.Candidate{{PushedTime: 0}, {PushedTime: 1}, {PushedTime: 2}, {PushedTime: 3}}
+
+	result, err := sut.Process(input)
+
+	require.NoError(e.T(), err)
+	require.Len(e.T(), result, len(input))
+}
+
+func TestEvaluatorSuite(t *testing.T) {
+	suite.Run(t, &EvaluatorTestSuite{})
+}