/**
* Converts a protobuf message to an SDC Record Field.
*
* @param record SDC Record to add field to
* @param fieldPath location in record where to insert field.
* @param descriptor protobuf descriptor instance
* @param messageTypeToExtensionMap protobuf extensions map
* @param message message to decode and insert into the specified field path
* @return new Field instance representing the decoded message
* @throws DataParserException
*/
public static Field protobufToSdcField(
Record record,
String fieldPath,
Descriptors.Descriptor descriptor,
Map<String, Set<Descriptors.FieldDescriptor>> messageTypeToExtensionMap,
Object message)
throws DataParserException {
Map<String, Field> sdcRecordMapFieldValue = new HashMap<>();
// get all the expected fields from the proto file
Map<String, Descriptors.FieldDescriptor> protobufFields = new LinkedHashMap<>();
for (Descriptors.FieldDescriptor fieldDescriptor : descriptor.getFields()) {
protobufFields.put(fieldDescriptor.getName(), fieldDescriptor);
}
// get all fields in the read message
Map<Descriptors.FieldDescriptor, Object> values = ((DynamicMessage) message).getAllFields();
// for every field present in the proto definition create an sdc field.
for (Descriptors.FieldDescriptor fieldDescriptor : protobufFields.values()) {
Object value = values.get(fieldDescriptor);
sdcRecordMapFieldValue.put(
fieldDescriptor.getName(),
createField(record, fieldPath, fieldDescriptor, messageTypeToExtensionMap, value));
}
// handle applicable extensions for this message type
if (messageTypeToExtensionMap.containsKey(descriptor.getFullName())) {
for (Descriptors.FieldDescriptor fieldDescriptor :
messageTypeToExtensionMap.get(descriptor.getFullName())) {
if (values.containsKey(fieldDescriptor)) {
Object value = values.get(fieldDescriptor);
sdcRecordMapFieldValue.put(
fieldDescriptor.getName(),
createField(record, fieldPath, fieldDescriptor, messageTypeToExtensionMap, value));
}
}
}
// handle unknown fields
// unknown fields can go into the record header
UnknownFieldSet unknownFields = ((DynamicMessage) message).getUnknownFields();
if (!unknownFields.asMap().isEmpty()) {
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
try {
unknownFields.writeDelimitedTo(bOut);
bOut.flush();
bOut.close();
} catch (IOException e) {
throw new DataParserException(Errors.PROTOBUF_10, e.toString(), e);
}
String path = fieldPath.isEmpty() ? FORWARD_SLASH : fieldPath;
byte[] bytes = org.apache.commons.codec.binary.Base64.encodeBase64(bOut.toByteArray());
record
.getHeader()
.setAttribute(
PROTOBUF_UNKNOWN_FIELDS_PREFIX + path, new String(bytes, StandardCharsets.UTF_8));
}
return Field.create(sdcRecordMapFieldValue);
}
