DeleteWithPrefix support for SQLite

state/feature.go

@@ -26,6 +26,8 @@ const (
 	FeatureQueryAPI Feature = "QUERY_API"
 	// FeatureTTL is the feature that supports TTLs.
 	FeatureTTL Feature = "TTL"
+	// FeatureDeleteWithPrefix is the feature that supports deleting with prefix.
+	FeatureDeleteWithPrefix Feature = "DELETE_WITH_PREFIX"
 )
 
 // Feature names a feature that can be implemented by state store components.

state/requests.go

@@ -14,6 +14,9 @@ limitations under the License.
 package state
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/dapr/components-contrib/state/query"
 )
 
@@ -67,6 +70,21 @@ func (r DeleteRequest) Operation() OperationType {
 	return OperationDelete
 }
 
+// DeleteWithPrefixRequest is the object describing a delete with prefix state request used for deleting actors.
+type DeleteWithPrefixRequest struct {
+	Prefix string `json:"prefix"`
+}
+
+func (r *DeleteWithPrefixRequest) Validate() error {
+	if r.Prefix == "" {
+		return fmt.Errorf("a prefix is required for deleteWithPrefix request")
+	}
+	if !strings.HasSuffix(r.Prefix, "||") {
+		r.Prefix += "||"
+	}
+	return nil
+}
+
 // DeleteStateOption controls how a state store reacts to a delete request.
 type DeleteStateOption struct {
 	Concurrency string `json:"concurrency,omitempty"` // "concurrency"

state/responses.go

@@ -52,3 +52,8 @@ type QueryItem struct {
 	Error       string  `json:"error,omitempty"`
 	ContentType *string `json:"contentType,omitempty"`
 }
+
+// DeleteWithPrefixResponse is the object representing a delete with prefix state response containing the number of items removed.
+type DeleteWithPrefixResponse struct {
+	Count int64 `json:"count"` // count of items removed
+}

state/sqlite/sqlite.go

@@ -49,6 +49,7 @@ func newSQLiteStateStore(logger logger.Logger, dba DBAccess) *SQLiteStore {
 			state.FeatureETag,
 			state.FeatureTransactional,
 			state.FeatureTTL,
+			state.FeatureDeleteWithPrefix,
 		},
 		dbaccess: dba,
 	}
@@ -100,6 +101,11 @@ func (s *SQLiteStore) Multi(ctx context.Context, request *state.TransactionalSta
 	return s.dbaccess.ExecuteMulti(ctx, request.Operations)
 }
 
+// DeleteWithPrefix deletes an actor's state
+func (s *SQLiteStore) DeleteWithPrefix(ctx context.Context, req state.DeleteWithPrefixRequest) (state.DeleteWithPrefixResponse, error) {
+	return s.dbaccess.DeleteWithPrefix(ctx, req)
+}
+
 // Close implements io.Closer.
 func (s *SQLiteStore) Close() error {
 	if s.dbaccess != nil {

state/sqlite/sqlite_dbaccess.go

@@ -45,6 +45,7 @@ type DBAccess interface {
 	Delete(ctx context.Context, req *state.DeleteRequest) error
 	BulkGet(ctx context.Context, req []state.GetRequest) ([]state.BulkGetResponse, error)
 	ExecuteMulti(ctx context.Context, reqs []state.TransactionalStateOperation) error
+	DeleteWithPrefix(ctx context.Context, req state.DeleteWithPrefixRequest) (state.DeleteWithPrefixResponse, error)
 	Close() error
 }
 
@@ -78,6 +79,7 @@ func (a *sqliteDBAccess) Init(ctx context.Context, md state.Metadata) error {
 		return err
 	}
 
+	registerFuntions()
 	connString, err := a.metadata.GetConnectionString(a.logger, sqlite.GetConnectionStringOpts{})
 	if err != nil {
 		// Already logged
@@ -418,6 +420,34 @@ func (a *sqliteDBAccess) Delete(ctx context.Context, req *state.DeleteRequest) e
 	return a.doDelete(ctx, a.db, req)
 }
 
+func (a *sqliteDBAccess) DeleteWithPrefix(ctx context.Context, req state.DeleteWithPrefixRequest) (state.DeleteWithPrefixResponse, error) {
+	if req.Prefix == "" {
+		return state.DeleteWithPrefixResponse{}, fmt.Errorf("missing prefix in delete with prefix operation")
+	}
+	ctx, cancel := context.WithTimeout(ctx, a.metadata.Timeout)
+	defer cancel()
+
+	err := req.Validate()
+	if err != nil {
+		return state.DeleteWithPrefixResponse{}, err
+	}
+
+	// Concatenation is required for table name because sql.DB does not substitute parameters for table names.
+	//nolint:gosec
+	result, err := a.db.ExecContext(ctx, "DELETE FROM "+a.metadata.TableName+" WHERE prefix = ?",
+		req.Prefix)
+	if err != nil {
+		return state.DeleteWithPrefixResponse{}, err
+	}
+
+	rows, err := result.RowsAffected()
+	if err != nil {
+		return state.DeleteWithPrefixResponse{}, err
+	}
+
+	return state.DeleteWithPrefixResponse{Count: rows}, nil
+}
+
 func (a *sqliteDBAccess) ExecuteMulti(parentCtx context.Context, reqs []state.TransactionalStateOperation) error {
 	tx, err := a.db.BeginTx(parentCtx, nil)
 	if err != nil {

state/sqlite/sqlite_integration_test.go

@@ -140,6 +140,10 @@ func TestSqliteIntegration(t *testing.T) {
 		multiWithSetOnly(t, s)
 	})
 
+	t.Run("Delete with Prefix (actor state)", func(t *testing.T) {
+		testDeleteWithPrefix(t, s)
+	})
+
 	t.Run("ttlExpireTime", func(t *testing.T) {
 		getExpireTime(t, s)
 		getBulkExpireTime(t, s)
@@ -610,6 +614,55 @@ func setItemWithNoKey(t *testing.T, s state.Store) {
 	require.Error(t, err)
 }
 
+func testDeleteWithPrefix(t *testing.T, s state.Store) {
+	setReq1 := &state.SetRequest{
+		Key: "mock-app-id||mock-actor-type||mock-actor-id||key0",
+	}
+
+	setReq2 := &state.SetRequest{
+		Key: "mock-app-id||mock-actor-type||mock-actor-id||key1",
+	}
+
+	setReq3 := &state.SetRequest{
+		Key: "mock-app-id||mock-actor-type||mock-actor-id||key2",
+	}
+
+	setReq4 := &state.SetRequest{
+		Key: "different-app-id||different-actor-type||different-actor-id||key0",
+	}
+
+	delReq := state.DeleteWithPrefixRequest{
+		Prefix: "mock-app-id||mock-actor-type||mock-actor-id",
+	}
+
+	err := s.Set(context.Background(), setReq1)
+	require.NoError(t, err)
+
+	err = s.Set(context.Background(), setReq2)
+	require.NoError(t, err)
+
+	err = s.Set(context.Background(), setReq3)
+	require.NoError(t, err)
+
+	err = s.Set(context.Background(), setReq4)
+	require.NoError(t, err)
+
+	res, err := s.(state.DeleteWithPrefix).DeleteWithPrefix(context.Background(), delReq)
+	require.NoError(t, err)
+	assert.Equal(t, int64(3), res.Count)
+
+	delReq = state.DeleteWithPrefixRequest{
+		Prefix: "different-app-id||different-actor-type||different-actor-id||",
+	}
+	res, err = s.(state.DeleteWithPrefix).DeleteWithPrefix(context.Background(), delReq)
+	require.NoError(t, err)
+	assert.Equal(t, int64(1), res.Count)
+
+	res, err = s.(state.DeleteWithPrefix).DeleteWithPrefix(context.Background(), delReq)
+	require.NoError(t, err)
+	assert.Equal(t, int64(0), res.Count)
+}
+
 func testSetItemWithInvalidTTL(t *testing.T, s state.Store) {
 	setReq := &state.SetRequest{
 		Key:   randomKey(),

state/sqlite/sqlite_migrations.go

@@ -16,18 +16,47 @@ package sqlite
 import (
 	"context"
 	"database/sql"
+	"database/sql/driver"
 	"fmt"
+	"strings"
 
 	commonsql "github.com/dapr/components-contrib/common/component/sql"
 	sqlitemigrations "github.com/dapr/components-contrib/common/component/sql/migrations/sqlite"
 	"github.com/dapr/kit/logger"
+
+	sqlite3 "modernc.org/sqlite"
 )
 
 type migrationOptions struct {
 	StateTableName    string
 	MetadataTableName string
 }
 
+func registerFuntions() {
+	sqlite3.RegisterDeterministicScalarFunction(
+		"parse_key_prefix",
+		1,
+		func(ctx *sqlite3.FunctionContext, args []driver.Value) (driver.Value, error) {
+			var s1 string
+			switch arg0 := args[0].(type) {
+			case string:
+				s1 = arg0
+			default:
+				return "", fmt.Errorf("expected argv[0] to be text")
+			}
+			if len(s1) == 0 {
+				return "", fmt.Errorf("cannot create prefix for empty string")
+			}
+
+			lastIndex := strings.LastIndex(s1, "||")
+			if lastIndex != -1 {
+				return s1[:lastIndex+2], nil
+			}
+			return "", nil
+		},
+	)
+}
+
 // Perform the required migrations
 func performMigrations(ctx context.Context, db *sql.DB, logger logger.Logger, opts migrationOptions) error {
 	m := sqlitemigrations.Migrations{
@@ -61,5 +90,23 @@ func performMigrations(ctx context.Context, db *sql.DB, logger logger.Logger, op
 			}
 			return nil
 		},
-	})
+		// Migration 1: add the "prefix" column
+		func(ctx context.Context) error {
+			// We add this virtual prefix column to enable us to delete an actor's state since this prefix will tell us which actor created it
+			logger.Infof("Creating virtual column for table '%s'", opts.StateTableName)
+			_, err := m.GetConn().ExecContext(
+				ctx,
+				fmt.Sprintf(
+					`ALTER TABLE %[1]s ADD COLUMN prefix TEXT GENERATED ALWAYS AS (parse_key_prefix(key)) VIRTUAL;
+					 CREATE INDEX %[1]s_prefix_index ON %[1]s(prefix) WHERE prefix != ""`,
+					opts.StateTableName,
+				),
+			)
+			if err != nil {
+				return fmt.Errorf("failed to create state table: %w", err)
+			}
+			return nil
+		},
+	},
+	)
 }

state/sqlite/sqlite_test.go

@@ -294,6 +294,15 @@ func TestValidMultiDeleteRequest(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestValidEmptyDeleteWithPrefixRequest(t *testing.T) {
+	t.Parallel()
+
+	ods := createSqlite(t)
+	res, err := ods.DeleteWithPrefix(context.Background(), createDeleteWithPrefixRequest())
+	require.NoError(t, err)
+	assert.Equal(t, int64(0), res.Count)
+}
+
 // Proves that the Ping method runs the ping method.
 func TestPingRunsDBAccessPing(t *testing.T) {
 	t.Parallel()
@@ -338,6 +347,10 @@ func (m *fakeDBaccess) BulkGet(parentCtx context.Context, req []state.GetRequest
 	return nil, nil
 }
 
+func (m *fakeDBaccess) DeleteWithPrefix(ctx context.Context, req state.DeleteWithPrefixRequest) (state.DeleteWithPrefixResponse, error) {
+	return state.DeleteWithPrefixResponse{}, nil
+}
+
 func (m *fakeDBaccess) Delete(ctx context.Context, req *state.DeleteRequest) error {
 	return nil
 }
@@ -389,6 +402,12 @@ func createDeleteRequest() state.DeleteRequest {
 	}
 }
 
+func createDeleteWithPrefixRequest() state.DeleteWithPrefixRequest {
+	return state.DeleteWithPrefixRequest{
+		Prefix: randomKey(),
+	}
+}
+
 func createSqliteWithFake(t *testing.T) (*SQLiteStore, *fakeDBaccess) {
 	ods := createSqlite(t)
 	fake := ods.dbaccess.(*fakeDBaccess)

state/store.go

@@ -61,3 +61,8 @@ func Ping(ctx context.Context, store Store) error {
 		return errors.New("ping is not implemented by this state store")
 	}
 }
+
+// DeleteWithPrefix is an interface to delete objects with a prefix.
+type DeleteWithPrefix interface {
+	DeleteWithPrefix(ctx context.Context, req DeleteWithPrefixRequest) (DeleteWithPrefixResponse, error)
+}