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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| { | ||
| "name" : "jr-protobuf-quickstart", | ||
| "config": { | ||
| "connector.class" : "io.jrnd.kafka.connect.connector.JRSourceConnector", | ||
| "template" : "shopping_rating", | ||
| "topic": "shopping_rating", | ||
| "frequency" : 5000, | ||
| "objects": 5, | ||
| "value.converter": "io.confluent.connect.protobuf.ProtobufConverter", | ||
| "value.converter.schema.registry.url": "http://schema-registry:8081", | ||
| "tasks.max": 1 | ||
| } | ||
| } |
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108 changes: 108 additions & 0 deletions
108
src/main/java/io/jrnd/kafka/connect/connector/format/protobuf/ProtobufHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package io.jrnd.kafka.connect.connector.format.protobuf; | ||
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| import com.fasterxml.jackson.databind.JsonNode; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.google.protobuf.DescriptorProtos; | ||
| import org.apache.kafka.connect.data.Schema; | ||
| import org.apache.kafka.connect.data.SchemaBuilder; | ||
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|
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| import java.util.HashMap; | ||
| import java.util.Iterator; | ||
| import java.util.Map; | ||
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| public class ProtobufHelper { | ||
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| private static final Map<DescriptorProtos.FieldDescriptorProto.Type, Schema> PROTOBUF_TO_KAFKA_CONNECT_TYPE_MAP = new HashMap<>(); | ||
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| static { | ||
| PROTOBUF_TO_KAFKA_CONNECT_TYPE_MAP.put(DescriptorProtos.FieldDescriptorProto.Type.TYPE_STRING, Schema.STRING_SCHEMA); | ||
| PROTOBUF_TO_KAFKA_CONNECT_TYPE_MAP.put(DescriptorProtos.FieldDescriptorProto.Type.TYPE_INT32, Schema.INT32_SCHEMA); | ||
| PROTOBUF_TO_KAFKA_CONNECT_TYPE_MAP.put(DescriptorProtos.FieldDescriptorProto.Type.TYPE_INT64, Schema.INT64_SCHEMA); | ||
| PROTOBUF_TO_KAFKA_CONNECT_TYPE_MAP.put(DescriptorProtos.FieldDescriptorProto.Type.TYPE_BOOL, Schema.BOOLEAN_SCHEMA); | ||
| } | ||
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| public static Schema createProtobufSchemaFromJson(String messageName, String jsonString) throws Exception { | ||
| DescriptorProtos.DescriptorProto proto = createProtobufSchema(messageName, jsonString); | ||
| return convertToKafkaConnectSchema(proto); | ||
| } | ||
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| private static DescriptorProtos.DescriptorProto createProtobufSchema(String messageName, String jsonString) throws Exception { | ||
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| ObjectMapper mapper = new ObjectMapper(); | ||
| JsonNode jsonNode = mapper.readTree(jsonString); | ||
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| DescriptorProtos.DescriptorProto.Builder messageDescriptorBuilder = DescriptorProtos.DescriptorProto.newBuilder() | ||
| .setName(messageName); | ||
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| Iterator<Map.Entry<String, JsonNode>> fields = jsonNode.fields(); | ||
| int fieldNumber = 1; | ||
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|
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| while (fields.hasNext()) { | ||
| Map.Entry<String, JsonNode> entry = fields.next(); | ||
| String fieldName = entry.getKey(); | ||
| JsonNode fieldValue = entry.getValue(); | ||
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| DescriptorProtos.FieldDescriptorProto.Type protoFieldType; | ||
| if (fieldValue.isTextual()) { | ||
| protoFieldType = DescriptorProtos.FieldDescriptorProto.Type.TYPE_STRING; | ||
| } else if (fieldValue.isInt()) { | ||
| protoFieldType = DescriptorProtos.FieldDescriptorProto.Type.TYPE_INT32; | ||
| } else if (fieldValue.isLong()) { | ||
| protoFieldType = DescriptorProtos.FieldDescriptorProto.Type.TYPE_INT64; | ||
| } else if (fieldValue.isBoolean()) { | ||
| protoFieldType = DescriptorProtos.FieldDescriptorProto.Type.TYPE_BOOL; | ||
| } else if (fieldValue.isObject()) { | ||
| DescriptorProtos.DescriptorProto nestedMessage = createProtobufSchema(fieldName, fieldValue.toString()); | ||
| protoFieldType = DescriptorProtos.FieldDescriptorProto.Type.TYPE_MESSAGE; | ||
| messageDescriptorBuilder.addNestedType(nestedMessage); | ||
| } else { | ||
| continue; | ||
| } | ||
|
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| DescriptorProtos.FieldDescriptorProto fieldDescriptorProto = DescriptorProtos.FieldDescriptorProto.newBuilder() | ||
| .setName(fieldName) | ||
| .setNumber(fieldNumber++) | ||
| .setType(protoFieldType) | ||
| .build(); | ||
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| messageDescriptorBuilder.addField(fieldDescriptorProto); | ||
| } | ||
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| return messageDescriptorBuilder.build(); | ||
| } | ||
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| private static Schema convertToKafkaConnectSchema(DescriptorProtos.DescriptorProto descriptorProto) { | ||
| SchemaBuilder schemaBuilder = SchemaBuilder.struct().name(descriptorProto.getName()); | ||
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| for (DescriptorProtos.FieldDescriptorProto field : descriptorProto.getFieldList()) { | ||
| String fieldName = field.getName(); | ||
| DescriptorProtos.FieldDescriptorProto.Type fieldType = field.getType(); | ||
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| if (fieldType == DescriptorProtos.FieldDescriptorProto.Type.TYPE_MESSAGE) { | ||
| DescriptorProtos.DescriptorProto nestedMessageDescriptor = findNestedMessage(descriptorProto, field); | ||
| if (nestedMessageDescriptor != null) { | ||
| Schema nestedSchema = convertToKafkaConnectSchema(nestedMessageDescriptor); | ||
| schemaBuilder.field(fieldName, nestedSchema); | ||
| } | ||
| } else { | ||
| Schema kafkaFieldSchema = PROTOBUF_TO_KAFKA_CONNECT_TYPE_MAP.get(fieldType); | ||
| if (kafkaFieldSchema != null) { | ||
| schemaBuilder.field(fieldName, kafkaFieldSchema); | ||
| } | ||
| } | ||
| } | ||
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| return schemaBuilder.build(); | ||
| } | ||
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| private static DescriptorProtos.DescriptorProto findNestedMessage(DescriptorProtos.DescriptorProto descriptorProto, DescriptorProtos.FieldDescriptorProto field) { | ||
| for (DescriptorProtos.DescriptorProto nestedType : descriptorProto.getNestedTypeList()) { | ||
| if (nestedType.getName().equals(field.getTypeName().substring(field.getTypeName().lastIndexOf(".") + 1))) { | ||
| return nestedType; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| } |