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/*
* 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.kafka.common.requests;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.message.OffsetFetchResponseData;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponsePartition;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponseTopic;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.protocol.types.Struct;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import static org.apache.kafka.common.record.RecordBatch.NO_PARTITION_LEADER_EPOCH;
/**
* Possible error codes:
*
* - Partition errors:
* - {@link Errors#UNKNOWN_TOPIC_OR_PARTITION}
* - {@link Errors#TOPIC_AUTHORIZATION_FAILED}
* - {@link Errors#UNSTABLE_OFFSET_COMMIT}
*
* - Group or coordinator errors:
* - {@link Errors#COORDINATOR_LOAD_IN_PROGRESS}
* - {@link Errors#COORDINATOR_NOT_AVAILABLE}
* - {@link Errors#NOT_COORDINATOR}
* - {@link Errors#GROUP_AUTHORIZATION_FAILED}
*/
public class OffsetFetchResponse extends AbstractResponse {
public static final long INVALID_OFFSET = -1L;
public static final String NO_METADATA = "";
public static final PartitionData UNKNOWN_PARTITION = new PartitionData(INVALID_OFFSET,
Optional.empty(),
NO_METADATA,
Errors.UNKNOWN_TOPIC_OR_PARTITION);
public static final PartitionData UNAUTHORIZED_PARTITION = new PartitionData(INVALID_OFFSET,
Optional.empty(),
NO_METADATA,
Errors.TOPIC_AUTHORIZATION_FAILED);
private static final List PARTITION_ERRORS = Arrays.asList(
Errors.UNKNOWN_TOPIC_OR_PARTITION, Errors.TOPIC_AUTHORIZATION_FAILED);
public final OffsetFetchResponseData data;
private final Errors error;
public static final class PartitionData {
public final long offset;
public final String metadata;
public final Errors error;
public final Optional leaderEpoch;
public PartitionData(long offset,
Optional leaderEpoch,
String metadata,
Errors error) {
this.offset = offset;
this.leaderEpoch = leaderEpoch;
this.metadata = metadata;
this.error = error;
}
public boolean hasError() {
return this.error != Errors.NONE;
}
@Override
public boolean equals(Object other) {
if (!(other instanceof PartitionData))
return false;
PartitionData otherPartition = (PartitionData) other;
return this.offset == otherPartition.offset
&& this.leaderEpoch.equals(otherPartition.leaderEpoch)
&& this.metadata.equals(otherPartition.metadata)
&& this.error.equals(otherPartition.error);
}
@Override
public String toString() {
return "PartitionData("
+ "offset=" + offset
+ ", leaderEpoch=" + leaderEpoch.orElse(NO_PARTITION_LEADER_EPOCH)
+ ", metadata=" + metadata
+ ", error='" + error.toString()
+ ")";
}
@Override
public int hashCode() {
return Objects.hash(offset, leaderEpoch, metadata, error);
}
}
/**
* Constructor for all versions without throttle time.
* @param error Potential coordinator or group level error code (for api version 2 and later)
* @param responseData Fetched offset information grouped by topic-partition
*/
public OffsetFetchResponse(Errors error, Map responseData) {
this(DEFAULT_THROTTLE_TIME, error, responseData);
}
/**
* Constructor with throttle time
* @param throttleTimeMs The time in milliseconds that this response was throttled
* @param error Potential coordinator or group level error code (for api version 2 and later)
* @param responseData Fetched offset information grouped by topic-partition
*/
public OffsetFetchResponse(int throttleTimeMs, Errors error, Map responseData) {
Map offsetFetchResponseTopicMap = new HashMap<>();
for (Map.Entry entry : responseData.entrySet()) {
String topicName = entry.getKey().topic();
OffsetFetchResponseTopic topic = offsetFetchResponseTopicMap.getOrDefault(
topicName, new OffsetFetchResponseTopic().setName(topicName));
PartitionData partitionData = entry.getValue();
topic.partitions().add(new OffsetFetchResponsePartition()
.setPartitionIndex(entry.getKey().partition())
.setErrorCode(partitionData.error.code())
.setCommittedOffset(partitionData.offset)
.setCommittedLeaderEpoch(
partitionData.leaderEpoch.orElse(NO_PARTITION_LEADER_EPOCH))
.setMetadata(partitionData.metadata)
);
offsetFetchResponseTopicMap.put(topicName, topic);
}
this.data = new OffsetFetchResponseData()
.setTopics(new ArrayList<>(offsetFetchResponseTopicMap.values()))
.setErrorCode(error.code())
.setThrottleTimeMs(throttleTimeMs);
this.error = error;
}
public OffsetFetchResponse(Struct struct, short version) {
this.data = new OffsetFetchResponseData(struct, version);
Errors topLevelError = Errors.NONE;
for (OffsetFetchResponseTopic topic : data.topics()) {
for (OffsetFetchResponsePartition partition : topic.partitions()) {
Errors partitionError = Errors.forCode(partition.errorCode());
if (partitionError != Errors.NONE && !PARTITION_ERRORS.contains(partitionError)) {
topLevelError = partitionError;
break;
}
}
}
// for version 2 and later use the top-level error code (in ERROR_CODE_KEY_NAME) from the response.
// for older versions there is no top-level error in the response and all errors are partition errors,
// so if there is a group or coordinator error at the partition level use that as the top-level error.
// this way clients can depend on the top-level error regardless of the offset fetch version.
this.error = version >= 2 ? Errors.forCode(data.errorCode()) : topLevelError;
}
@Override
public int throttleTimeMs() {
return data.throttleTimeMs();
}
public boolean hasError() {
return error != Errors.NONE;
}
public Errors error() {
return error;
}
@Override
public Map errorCounts() {
return errorCounts(error);
}
public Map responseData() {
Map responseData = new HashMap<>();
for (OffsetFetchResponseTopic topic : data.topics()) {
for (OffsetFetchResponsePartition partition : topic.partitions()) {
responseData.put(new TopicPartition(topic.name(), partition.partitionIndex()),
new PartitionData(partition.committedOffset(),
RequestUtils.getLeaderEpoch(partition.committedLeaderEpoch()),
partition.metadata(),
Errors.forCode(partition.errorCode()))
);
}
}
return responseData;
}
public static OffsetFetchResponse parse(ByteBuffer buffer, short version) {
return new OffsetFetchResponse(ApiKeys.OFFSET_FETCH.parseResponse(version, buffer), version);
}
@Override
protected Struct toStruct(short version) {
return data.toStruct(version);
}
@Override
public boolean shouldClientThrottle(short version) {
return version >= 4;
}
}
