create metadata constants (#31)

opencdc/metadata.go

@@ -40,6 +40,9 @@ const (
 	// read from the 3rd party system. The expected format is a unix timestamp
 	// in nanoseconds.
 	MetadataReadAt = "opencdc.readAt"
+	// MetadataCollection is a Record.Metadata key for the name of the collection
+	// where the record originated from and/or where it should be stored.
+	MetadataCollection = "opencdc.collection"
 
 	// MetadataConduitSourcePluginName is a Record.Metadata key for the name of
 	// the source plugin that created this record.
@@ -57,7 +60,7 @@ const (
 	MetadataConduitDestinationPluginVersion = "conduit.destination.plugin.version"
 
 	// MetadataConduitSourceConnectorID is a Record.Metadata key for the ID of
-	// the source connector that received this record.
+	// the source connector that produced this record.
 	MetadataConduitSourceConnectorID = "conduit.source.connector.id"
 	// MetadataConduitDLQNackError is a Record.Metadata key for the error that
 	// caused a record to be nacked and pushed to the dead-letter queue.
@@ -130,6 +133,17 @@ func (m Metadata) SetReadAt(createdAt time.Time) {
 	m[MetadataReadAt] = strconv.FormatInt(createdAt.UnixNano(), 10)
 }
 
+// GetCollection returns the value for key MetadataCollection. If the value does
+// not exist or is empty the function returns ErrMetadataFieldNotFound.
+func (m Metadata) GetCollection() (string, error) {
+	return m.getValue(MetadataCollection)
+}
+
+// SetCollection sets the metadata value for key MetadataCollection.
+func (m Metadata) SetCollection(collection string) {
+	m[MetadataCollection] = collection
+}
+
 // GetConduitSourcePluginName returns the value for key
 // MetadataConduitSourcePluginName. If the value does not exist or is empty the
 // function returns ErrMetadataFieldNotFound.

opencdc/metadata_test.go

@@ -17,6 +17,7 @@ package opencdc
 import (
 	"testing"
 
+	metadatav1 "github.com/conduitio/conduit-commons/proto/metadata/v1"
 	opencdcv1 "github.com/conduitio/conduit-commons/proto/opencdc/v1"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/runtime/protoimpl"
@@ -28,6 +29,15 @@ func TestMetadataConstants(t *testing.T) {
 		MetadataOpenCDCVersion: opencdcv1.E_MetadataVersion,
 		MetadataCreatedAt:      opencdcv1.E_MetadataCreatedAt,
 		MetadataReadAt:         opencdcv1.E_MetadataReadAt,
+		MetadataCollection:     opencdcv1.E_MetadataCollection,
+
+		MetadataConduitSourcePluginName:         metadatav1.E_MetadataConduitSourcePluginName,
+		MetadataConduitSourcePluginVersion:      metadatav1.E_MetadataConduitSourcePluginVersion,
+		MetadataConduitDestinationPluginName:    metadatav1.E_MetadataConduitDestinationPluginName,
+		MetadataConduitDestinationPluginVersion: metadatav1.E_MetadataConduitDestinationPluginVersion,
+		MetadataConduitSourceConnectorID:        metadatav1.E_MetadataConduitSourceConnectorId,
+		MetadataConduitDLQNackError:             metadatav1.E_MetadataConduitDlqNackError,
+		MetadataConduitDLQNackNodeID:            metadatav1.E_MetadataConduitDlqNackNodeId,
 	}
 	for goConstant, extensionInfo := range wantMapping {
 		protoConstant := proto.GetExtension(extensionInfo.TypeDescriptor().ParentFile().Options(), extensionInfo)