lkuchars commented on code in PR #10105: URL: https://github.com/apache/nifi/pull/10105#discussion_r2254090326
########## nifi-extension-bundles/nifi-confluent-platform-bundle/nifi-confluent-protobuf-message-name-resolver/src/main/java/org/apache/nifi/confluent/schemaregistry/ConfluentProtobufMessageNameResolver.java: ########## @@ -0,0 +1,193 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.nifi.confluent.schemaregistry; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnDisabled; +import org.apache.nifi.annotation.lifecycle.OnEnabled; +import org.apache.nifi.confluent.schema.AntlrProtobufMessageSchemaParser; +import org.apache.nifi.confluent.schema.ProtobufMessageSchema; +import org.apache.nifi.controller.AbstractControllerService; +import org.apache.nifi.controller.ConfigurationContext; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.schemaregistry.services.MessageName; +import org.apache.nifi.schemaregistry.services.MessageNameResolver; +import org.apache.nifi.schemaregistry.services.SchemaDefinition; +import org.apache.nifi.schemaregistry.services.StandardMessageName; +import org.jetbrains.annotations.NotNull; + +import java.io.IOException; +import java.io.InputStream; +import java.time.Duration; +import java.util.ArrayList; +import java.util.List; +import java.util.stream.Collectors; + +import static java.lang.String.format; +import static java.util.Collections.singletonList; +import static org.apache.nifi.confluent.schemaregistry.VarintUtils.decodeZigZag; +import static org.apache.nifi.confluent.schemaregistry.VarintUtils.readVarintFromStream; +import static org.apache.nifi.confluent.schemaregistry.VarintUtils.readVarintFromStreamAfterFirstByteConsumed; + +@Tags({"confluent", "schema", "registry", "protobuf", "message", "name", "resolver"}) +@CapabilityDescription(""" + Resolves Protobuf message names from Confluent Schema Registry wire format by decoding message indexes and looking up the fully qualified name in the schema definition + For Confluent wire format reference see: <a href="https://docs.confluent.io/platform/current/schema-registry/fundamentals/serdes-develop/index.html#wire-format";>Confluent Wire Format</a> + """) +public class ConfluentProtobufMessageNameResolver extends AbstractControllerService implements MessageNameResolver { + + public static final int MAXIMUM_SUPPORTED_ARRAY_LENGTH = 100; + private Cache<FindMessageNameArguments, MessageName> messageNameCache; + + @OnEnabled + public void onEnabled(final ConfigurationContext context) { + messageNameCache = Caffeine.newBuilder().maximumSize(1000).expireAfterWrite(Duration.ofHours(1)).build(); + } + + @OnDisabled + public void onDisabled(final ConfigurationContext context) { + if (messageNameCache != null) { + messageNameCache.invalidateAll(); + } + } + + + @Override + public MessageName getMessageName(@NotNull final SchemaDefinition schemaDefinition, final InputStream inputStream) throws IOException { + final ComponentLog logger = getLogger(); + + // Read message indexes directly from stream (Confluent wire format) + final List<Integer> messageIndexes = readMessageIndexesFromStream(inputStream); + + logger.debug("Decoded message indexes: {}", messageIndexes); + + final FindMessageNameArguments findMessageNameArgs = new FindMessageNameArguments(schemaDefinition, messageIndexes); + + return messageNameCache.get(findMessageNameArgs, this::findMessageName); + + } + + /** + * Reads message indexes directly from the input stream using Confluent wire format. + * Format: [array_length:varint][index1:varint][index2:varint]...[indexN:varint] + * Special case: single 0 byte means first message (index 0) + * <p> + * <a href="https://docs.confluent.io/platform/current/schema-registry/fundamentals/serdes-develop/index.html#wire-format";>Wire format</a> + * + * @param inputStream the input stream positioned after the Confluent header (magic byte + schema ID) + * @return list of message indexes + * @throws IOException if unable to read from stream or invalid format + */ + private @NotNull List<Integer> readMessageIndexesFromStream(final InputStream inputStream) throws IOException { + // Special case: check if first byte is 0 (most common case) + final int firstByte = inputStream.read(); + if (firstByte == -1) { + throw new IOException("Unexpected end of stream while reading message indexes"); + } + + if (firstByte == 0) { + // Single 0 byte means first message type (index 0) + return List.of(0); + } + + // General case: read array length as varint + int arrayLength = readVarintFromStreamAfterFirstByteConsumed(inputStream, firstByte); + arrayLength = decodeZigZag(arrayLength); Review Comment: I think Michał Bobowski might have moved it already to VarintUtils -- This is an automated message from the Apache Git Service. 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