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synced 2026-09-15 11:00:51 +02:00
Fix OffsetCommit/OffsetFetch hardcoded parsing for real clients
CRITICAL FIX: Implement proper OffsetCommit/OffsetFetch request parsing ## Issues Fixed: - OffsetCommit was returning hardcoded 'test-topic' with partition 0 - OffsetFetch was ignoring actual topics/partitions in requests - Consumer groups could not commit/fetch real offsets - Parsing logic was completely stubbed out ## OffsetCommit Implementation: - Parse RetentionTime (8 bytes, -1 for broker default) - Parse Topics array with actual topic names - Parse Partitions array with: - Partition index (4 bytes) - Committed offset (8 bytes) - Leader epoch (4 bytes) - Metadata (nullable string) - Added comprehensive debug logging ## OffsetFetch Implementation: - Parse Topics array with actual topic names - Parse Partitions array (empty = fetch all partitions) - Parse RequireStable flag for transactional consistency - Handle 'fetch all partitions' case (partitionsCount = 0) - Added comprehensive debug logging ## Protocol Compliance: - Follows Kafka protocol specification for OffsetCommit/OffsetFetch - Proper handling of nullable strings and arrays - Correct byte order parsing (BigEndian) - Robust error handling for malformed requests ## Testing: - Compilation successful - Debug logging will show actual parsed values - Should enable real consumer group offset management This fix resolves the second most critical compatibility issue preventing real Kafka clients from managing consumer group offsets.
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chrislu
@@ -292,28 +292,108 @@ func (h *Handler) parseOffsetCommitRequest(data []byte) (*OffsetCommitRequest, e
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memberID := string(data[offset : offset+memberIDLength])
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offset += memberIDLength
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// TODO: CRITICAL - This parsing is completely broken for real clients
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// Currently hardcoded to return "test-topic" with partition 0
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// Real OffsetCommit requests contain:
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// - RetentionTime (8 bytes, -1 for broker default)
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// - Topics array with actual topic names
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// - Partitions array with actual partition IDs and offsets
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// - Optional group instance ID for static membership
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// Without fixing this, no real Kafka client can commit offsets properly
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// Parse RetentionTime (8 bytes, -1 for broker default)
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if len(data) < offset+8 {
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return nil, fmt.Errorf("OffsetCommit request missing retention time")
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}
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retentionTime := int64(binary.BigEndian.Uint64(data[offset : offset+8]))
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offset += 8
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// Parse Topics array
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if len(data) < offset+4 {
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return nil, fmt.Errorf("OffsetCommit request missing topics array")
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}
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topicsCount := binary.BigEndian.Uint32(data[offset : offset+4])
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offset += 4
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fmt.Printf("DEBUG: OffsetCommit - GroupID: %s, GenerationID: %d, MemberID: %s, RetentionTime: %d, TopicsCount: %d\n",
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groupID, generationID, memberID, retentionTime, topicsCount)
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topics := make([]OffsetCommitTopic, 0, topicsCount)
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for i := uint32(0); i < topicsCount && offset < len(data); i++ {
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// Parse topic name
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if len(data) < offset+2 {
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break
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}
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topicNameLength := binary.BigEndian.Uint16(data[offset : offset+2])
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offset += 2
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if len(data) < offset+int(topicNameLength) {
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break
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}
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topicName := string(data[offset : offset+int(topicNameLength)])
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offset += int(topicNameLength)
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// Parse partitions array
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if len(data) < offset+4 {
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break
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}
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partitionsCount := binary.BigEndian.Uint32(data[offset : offset+4])
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offset += 4
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partitions := make([]OffsetCommitPartition, 0, partitionsCount)
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for j := uint32(0); j < partitionsCount && offset < len(data); j++ {
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// Parse partition index (4 bytes)
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if len(data) < offset+4 {
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break
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}
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partitionIndex := int32(binary.BigEndian.Uint32(data[offset : offset+4]))
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offset += 4
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// Parse committed offset (8 bytes)
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if len(data) < offset+8 {
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break
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}
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committedOffset := int64(binary.BigEndian.Uint64(data[offset : offset+8]))
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offset += 8
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// Parse leader epoch (4 bytes)
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if len(data) < offset+4 {
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break
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}
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leaderEpoch := int32(binary.BigEndian.Uint32(data[offset : offset+4]))
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offset += 4
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// Parse metadata (nullable string)
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if len(data) < offset+2 {
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break
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}
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metadataLength := int16(binary.BigEndian.Uint16(data[offset : offset+2]))
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offset += 2
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var metadata string
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if metadataLength == -1 {
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metadata = "" // null string
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} else if metadataLength >= 0 && len(data) >= offset+int(metadataLength) {
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metadata = string(data[offset : offset+int(metadataLength)])
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offset += int(metadataLength)
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}
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partitions = append(partitions, OffsetCommitPartition{
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Index: partitionIndex,
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Offset: committedOffset,
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LeaderEpoch: leaderEpoch,
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Metadata: metadata,
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})
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fmt.Printf("DEBUG: OffsetCommit - Topic: %s, Partition: %d, Offset: %d, LeaderEpoch: %d, Metadata: %s\n",
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topicName, partitionIndex, committedOffset, leaderEpoch, metadata)
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}
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topics = append(topics, OffsetCommitTopic{
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Name: topicName,
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Partitions: partitions,
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})
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}
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return &OffsetCommitRequest{
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GroupID: groupID,
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GenerationID: generationID,
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MemberID: memberID,
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RetentionTime: -1, // Use broker default
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Topics: []OffsetCommitTopic{
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{
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Name: "test-topic", // TODO: Parse actual topic from request
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Partitions: []OffsetCommitPartition{
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{Index: 0, Offset: 0, LeaderEpoch: -1, Metadata: ""}, // TODO: Parse actual partition data
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},
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},
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},
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RetentionTime: retentionTime,
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Topics: topics,
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}, nil
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}
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@@ -333,23 +413,76 @@ func (h *Handler) parseOffsetFetchRequest(data []byte) (*OffsetFetchRequest, err
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groupID := string(data[offset : offset+groupIDLength])
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offset += groupIDLength
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// TODO: CRITICAL - OffsetFetch parsing is also hardcoded
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// Real clients send topics array with specific partitions to fetch
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// Need to parse:
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// - Topics array (4 bytes count + topics)
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// - For each topic: name + partitions array
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// - RequireStable flag for transactional consistency
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// Currently will fail with any real Kafka client doing offset fetches
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// Parse Topics array
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if len(data) < offset+4 {
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return nil, fmt.Errorf("OffsetFetch request missing topics array")
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}
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topicsCount := binary.BigEndian.Uint32(data[offset : offset+4])
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offset += 4
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fmt.Printf("DEBUG: OffsetFetch - GroupID: %s, TopicsCount: %d\n", groupID, topicsCount)
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topics := make([]OffsetFetchTopic, 0, topicsCount)
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for i := uint32(0); i < topicsCount && offset < len(data); i++ {
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// Parse topic name
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if len(data) < offset+2 {
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break
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}
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topicNameLength := binary.BigEndian.Uint16(data[offset : offset+2])
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offset += 2
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if len(data) < offset+int(topicNameLength) {
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break
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}
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topicName := string(data[offset : offset+int(topicNameLength)])
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offset += int(topicNameLength)
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// Parse partitions array
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if len(data) < offset+4 {
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break
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}
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partitionsCount := binary.BigEndian.Uint32(data[offset : offset+4])
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offset += 4
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partitions := make([]int32, 0, partitionsCount)
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// If partitionsCount is 0, it means "fetch all partitions"
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if partitionsCount == 0 {
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fmt.Printf("DEBUG: OffsetFetch - Topic: %s, Partitions: ALL\n", topicName)
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partitions = nil // nil means all partitions
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} else {
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for j := uint32(0); j < partitionsCount && offset < len(data); j++ {
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// Parse partition index (4 bytes)
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if len(data) < offset+4 {
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break
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}
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partitionIndex := int32(binary.BigEndian.Uint32(data[offset : offset+4]))
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offset += 4
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partitions = append(partitions, partitionIndex)
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fmt.Printf("DEBUG: OffsetFetch - Topic: %s, Partition: %d\n", topicName, partitionIndex)
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}
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}
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topics = append(topics, OffsetFetchTopic{
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Name: topicName,
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Partitions: partitions,
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})
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}
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// Parse RequireStable flag (1 byte) - for transactional consistency
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var requireStable bool
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if len(data) >= offset+1 {
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requireStable = data[offset] != 0
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offset += 1
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fmt.Printf("DEBUG: OffsetFetch - RequireStable: %v\n", requireStable)
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}
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return &OffsetFetchRequest{
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GroupID: groupID,
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Topics: []OffsetFetchTopic{
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{
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Name: "test-topic", // TODO: Parse actual topics from request
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Partitions: []int32{0}, // TODO: Parse actual partitions or empty for "all"
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},
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},
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RequireStable: false,
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GroupID: groupID,
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Topics: topics,
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RequireStable: requireStable,
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}, nil
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}
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