add filtering mechanism to storage and embed Driver directly into Storage

pkg/storage/filter.go

+package storage
+
+import rspb "k8s.io/helm/pkg/proto/hapi/release"
+
+// FilterFunc returns true if the release object satisfies
+// the predicate of the underlying func.
+type FilterFunc func(*rspb.Release) bool
+
+// Check applies the FilterFunc to the release object.
+func (fn FilterFunc) Check(rls *rspb.Release) bool {
+	if rls == nil {
+		return false
+	}
+	return fn(rls) 
+}
+
+// Any returns a FilterFunc that filters a list of releases
+// determined by the predicate 'f0 || f1 || ... || fn'.
+func Any(filters ...FilterFunc) FilterFunc {
+	return func(rls *rspb.Release) bool {
+		for _, filter := range filters {
+			if filter(rls) {
+				return true
+			}
+		}
+		return false
+	}
+}
+
+// All returns a FilterFunc that filters a list of releases
+// determined by the predicate 'f0 && f1 && ... && fn'.
+func All(filters ...FilterFunc) FilterFunc {
+	return func(rls *rspb.Release) bool {
+		for _, filter := range filters {
+			if !filter(rls) {
+				return false
+			}
+		}
+		return true
+	}
+}
+
+// StatusFilter filters a set of releases by status code.
+func StatusFilter(status rspb.Status_Code) FilterFunc {
+	return FilterFunc(func(rls *rspb.Release) bool {
+		if rls == nil {
+			return true
+		}
+		return rls.GetInfo().GetStatus().Code == status
+	})
+}
\ No newline at end of file

pkg/storage/storage.go

@@ -21,28 +21,76 @@ import (
 )
 
 type Storage struct {
-	drv driver.Driver
+	driver.Driver
 }
 
-func (st *Storage) StoreRelease(rls *rspb.Release) error {
-	return st.drv.Create(rls)
+// Create creates a new storage entry holding the release.
+// An error is returned if storage failed to store the release.
+//
+// TODO: Is marking the release as deployed the only task here?
+// 		 What happens if an identical release already exists?
+func (s *Storage) Create(rls *rspb.Release) error {
+	return s.Driver.Create(rls)
 }
 
-func (st *Storage) UpdateRelease(rls *rspb.Release) error {
-	return st.drv.Update(rls)
+// Update update the release in storage. An error is returned if the
+// storage backend fails to update the release or if the release does not exist.
+//
+// TODO: Fetch most recent deployed release, if it exists, mark
+// 		 as SUPERSEDED, then store both new and old.
+func (s *Storage) Update(rls *rspb.Release) error {
+	return s.Driver.Update(rls)
 }
 
-func (st *Storage) QueryRelease(key string) (*rspb.Release, error) {
-	return st.drv.Get(key)
+// Delete deletes the release from storage. An error is returned if the
+// storage backend fails to delete the release or if the release does not exist.
+//
+// TODO: The release status should be modified to reflect the DELETED status.
+func (s *Storage) Delete(key string) (*rspb.Release, error) {
+	return s.Driver.Delete(key)
 }
 
-func (st *Storage) DeleteRelease(key string) (*rspb.Release, error) {
-	return st.drv.Delete(key)
+// ListReleases returns all releases from storage. An error is returned if the
+// storage backend fails to retrieve the releases.
+func (s *Storage) ListReleases() ([]*rspb.Release, error) {
+	return s.Driver.List(func(_ *rspb.Release) bool { return true })
 }
 
-func Init(drv driver.Driver) *Storage {
-	if drv == nil {
-		drv = driver.NewMemory()
-	}
-	return &Storage{drv: drv}
+// ListDeleted returns all releases with Status == DELETED. An error is returned
+// if the storage backend fails to retrieve the releases.
+func (s *Storage) ListDeleted() ([]*rspb.Release, error) {
+	return s.Driver.List(func(rls *rspb.Release) bool {
+		return StatusFilter(rspb.Status_DELETED).Check(rls)
+	})
 }
+
+// ListDeployed returns all releases with Status == DEPLOYED. An error is returned
+// if the storage backend fails to retrieve the releases.
+func (s *Storage) ListDeployed() ([]*rspb.Release, error) {
+	return s.Driver.List(func(rls *rspb.Release) bool {
+		return StatusFilter(rspb.Status_DEPLOYED).Check(rls)
+	})
+}
+
+// ListFilterAll returns the set of releases satisfying satisfying the predicate
+// (filter0 && filter1 && ... && filterN), i.e. a Release is included in the results
+// if and only if all filters return true.
+func (s *Storage) ListFilterAll(filters ...FilterFunc) ([]*rspb.Release, error) {
+	return s.Driver.List(func(rls *rspb.Release) bool {
+		return All(filters...).Check(rls)
+	})
+}
+
+// ListFilterAny returns the set of releases satisfying satisfying the predicate
+// (filter0 || filter1 || ... || filterN), i.e. a Release is included in the results
+// if at least one of the filters returns true.
+func (s *Storage) ListFilterAny(filters ...FilterFunc) ([]*rspb.Release, error) {
+	return s.Driver.List(func(rls *rspb.Release) bool {
+		return Any(filters...).Check(rls)
+	})
+}
+
+func Init(d driver.Driver) *Storage {
+	if d == nil { d = driver.NewMemory() }
+	return &Storage{Driver: d}
+}
\ No newline at end of file

pkg/storage/storage_test.go

@@ -19,123 +19,159 @@ import (
 	"fmt"
 	"reflect"
 	"testing"
-	"time"
 
 	rspb "k8s.io/helm/pkg/proto/hapi/release"
 	"k8s.io/helm/pkg/storage/driver"
-
-	tspb "github.com/golang/protobuf/ptypes"
 )
 
 var storage = Init(driver.NewMemory())
 
-func releaseData() *rspb.Release {
-	var manifest = `apiVersion: v1
-	kind: ConfigMap
-	metadata:
-	  name: configmap-storage-test
-	data:
-	  count: "100"
-	  limit: "200"
-	  state: "new"
-	  token: "abc"
-	`
+func TestStorageCreate(t *testing.T) {
+	// create fake release
+	rls := ReleaseTestData{Name: "angry-beaver"}.ToRelease()
+	assertErrNil(t.Fatal, storage.Create(rls), "StoreRelease")
 
-	tm, _ := tspb.TimestampProto(time.Now())
-	return &rspb.Release{
-		Name: "hungry-hippo",
-		Info: &rspb.Info{
-			FirstDeployed: tm,
-			LastDeployed:  tm,
-			Status:        &rspb.Status{Code: rspb.Status_DEPLOYED},
-		},
-		Version:   2,
-		Manifest:  manifest,
-		Namespace: "kube-system",
+	// fetch the release
+	res, err := storage.Get(rls.Name)
+	assertErrNil(t.Fatal, err, "QueryRelease")
+
+	// verify the fetched and created release are the same
+	if !reflect.DeepEqual(rls, res) {
+		t.Fatalf("Expected %q, got %q", rls, res)
 	}
 }
 
-func TestStoreRelease(t *testing.T) {
-	ckerr := func(err error, msg string) {
-		if err != nil {
-			t.Fatalf(fmt.Sprintf("Failed to %s: %q", msg, err))
-		}
-	}
+func TestStorageUpdate(t *testing.T) {
+	// create fake release
+	rls := ReleaseTestData{Name: "angry-beaver"}.ToRelease()
+	assertErrNil(t.Fatal, storage.Create(rls), "StoreRelease")
 
-	rls := releaseData()
-	ckerr(storage.StoreRelease(rls), "StoreRelease")
+	// modify the release
+	rls.Version  = 2
+	rls.Manifest = "new-manifest"
+	assertErrNil(t.Fatal, storage.Update(rls), "UpdateRelease")
 
-	res, err := storage.QueryRelease(rls.Name)
-	ckerr(err, "QueryRelease")
+	// retrieve the updated release
+	res, err := storage.Get(rls.Name)
+	assertErrNil(t.Fatal, err, "QueryRelease")
 
+	// verify updated and fetched releases are the same.
 	if !reflect.DeepEqual(rls, res) {
 		t.Fatalf("Expected %q, got %q", rls, res)
 	}
 }
 
-func TestQueryRelease(t *testing.T) {
-	ckerr := func(err error, msg string) {
-		if err != nil {
-			t.Fatalf(fmt.Sprintf("Failed to %s: %q", msg, err))
-		}
-	}
-
-	rls := releaseData()
-	ckerr(storage.StoreRelease(rls), "StoreRelease")
+func TestStorageDelete(t *testing.T) {
+	// create fake release
+	rls := ReleaseTestData{Name: "angry-beaver"}.ToRelease()
+	assertErrNil(t.Fatal, storage.Create(rls), "StoreRelease")
 
-	res, err := storage.QueryRelease(rls.Name)
-	ckerr(err, "QueryRelease")
+	// delete the release
+	res, err := storage.Delete(rls.Name)
+	assertErrNil(t.Fatal, err, "DeleteRelease")
 
+	// verify updated and fetched releases are the same.
 	if !reflect.DeepEqual(rls, res) {
 		t.Fatalf("Expected %q, got %q", rls, res)
 	}
 }
 
-func TestDeleteRelease(t *testing.T) {
-	ckerr := func(err error, msg string) {
-		if err != nil {
-			t.Fatalf(fmt.Sprintf("Failed to %s: %q", msg, err))
-		}
+func TestStorageList(t *testing.T) {
+	// setup storage with test releases
+	setup := func() {
+		// release records
+		rls0 := ReleaseTestData{Name: "happy-catdog", Status: rspb.Status_SUPERSEDED}.ToRelease()
+		rls1 := ReleaseTestData{Name: "livid-human",  Status: rspb.Status_SUPERSEDED}.ToRelease()
+		rls2 := ReleaseTestData{Name: "relaxed-cat",  Status: rspb.Status_SUPERSEDED}.ToRelease()
+		rls3 := ReleaseTestData{Name: "hungry-hippo", Status: rspb.Status_DEPLOYED}.ToRelease()
+		rls4 := ReleaseTestData{Name: "angry-beaver", Status: rspb.Status_DEPLOYED}.ToRelease()
+		rls5 := ReleaseTestData{Name: "opulent-frog", Status: rspb.Status_DELETED}.ToRelease()
+		rls6 := ReleaseTestData{Name: "happy-liger",  Status: rspb.Status_DELETED}.ToRelease()
+
+		// create the release records in the storage
+		assertErrNil(t.Fatal, storage.Create(rls0), "Storing release 'rls0'")
+		assertErrNil(t.Fatal, storage.Create(rls1), "Storing release 'rls1'")
+		assertErrNil(t.Fatal, storage.Create(rls2), "Storing release 'rls2'")
+		assertErrNil(t.Fatal, storage.Create(rls3), "Storing release 'rls3'")
+		assertErrNil(t.Fatal, storage.Create(rls4), "Storing release 'rls4'")
+		assertErrNil(t.Fatal, storage.Create(rls5), "Storing release 'rls5'")
+		assertErrNil(t.Fatal, storage.Create(rls6), "Storing release 'rls6'")
 	}
 
-	rls := releaseData()
-	ckerr(storage.StoreRelease(rls), "StoreRelease")
-
-	res, err := storage.DeleteRelease(rls.Name)
-	ckerr(err, "DeleteRelease")
-
-	if !reflect.DeepEqual(rls, res) {
-		t.Fatalf("Expected %q, got %q", rls, res)
+	var listTests = []struct{
+		Description string
+		NumExpected int
+		ListFunc 	func() ([]*rspb.Release,error)
+	}{
+		{"ListDeleted",  2, storage.ListDeleted},
+		{"ListDeployed", 2, storage.ListDeployed},
+		{"ListReleases", 7, storage.ListReleases},
 	}
-}
 
-func TestUpdateRelease(t *testing.T) {
-	ckeql := func(got, want interface{}, msg string) {
-		if !reflect.DeepEqual(got, want) {
-			t.Fatalf(fmt.Sprintf("%s: got %T, want %T", msg, got, want))
+	setup()
+
+	for _, tt := range listTests {
+		list, err := tt.ListFunc()
+		assertErrNil(t.Fatal, err, tt.Description)
+		// verify the count of releases returned
+		if len(list) != tt.NumExpected {
+			t.Errorf("ListReleases(%s): expected %d, actual %d",
+				tt.Description,
+				tt.NumExpected,
+				len(list))
 		}
 	}
+}
 
-	ckerr := func(err error, msg string) {
-		if err != nil {
-			t.Fatalf(fmt.Sprintf("Failed to %s: %q", msg, err))
-		}
+type ReleaseTestData struct {
+	Name 	  string
+	Version   int32
+	Manifest  string
+	Namespace string
+	Status 	  rspb.Status_Code
+}
+
+func (test ReleaseTestData) ToRelease() *rspb.Release {
+	return &rspb.Release{
+		Name: 	   test.Name,
+		Version:   test.Version,
+		Manifest:  test.Manifest,
+		Namespace: test.Namespace,
+		Info: 	   &rspb.Info{Status: &rspb.Status{Code: test.Status}},
 	}
+}
 
-	rls := releaseData()
-	ckerr(storage.StoreRelease(rls), "StoreRelease")
+func assertErrNil(eh func(args ...interface{}), err error, message string) {
+	if err != nil {
+		eh(fmt.Sprintf("%s: %q", message, err))
+	}
+}
 
-	rls.Name = "hungry-hippo"
-	rls.Version = 2
-	rls.Manifest = "old-manifest"
 
-	err := storage.UpdateRelease(rls)
-	ckerr(err, "UpdateRelease")
+/*
+func releaseData() *rspb.Release {
+	var manifest = `apiVersion: v1
+	kind: ConfigMap
+	metadata:
+	  name: configmap-storage-test
+	data:
+	  count: "100"
+	  limit: "200"
+	  state: "new"
+	  token: "abc"
+	`
 
-	res, err := storage.QueryRelease(rls.Name)
-	ckerr(err, "QueryRelease")
-	ckeql(res, rls, "Expected Release")
-	ckeql(res.Name, rls.Name, "Expected Name")
-	ckeql(res.Version, rls.Version, "Expected Version")
-	ckeql(res.Manifest, rls.Manifest, "Expected Manifest")
+	tm, _ := tspb.TimestampProto(time.Now())
+	return &rspb.Release{
+		Name: "hungry-hippo",
+		Info: &rspb.Info{
+			FirstDeployed: tm,
+			LastDeployed:  tm,
+			Status:        &rspb.Status{Code: rspb.Status_DEPLOYED},
+		},
+		Version:   2,
+		Manifest:  manifest,
+		Namespace: "kube-system",
+	}
 }
+*/
\ No newline at end of file