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feat: complete consumer group coordination protocol - SyncGroup v3 and OffsetFetch fixes

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🎉 MAJOR MILESTONE: Full consumer group protocol working!

✅ Completed Protocol Flow:
- FindCoordinator v2: Fixed response format with throttle_time, error_code, error_message
- JoinGroup v5: Fixed request parsing with GroupInstanceID field
- SyncGroup v3: Fixed request parsing and response format with throttle_time
- OffsetFetch: Fixed GroupID parsing by adding client_id field handling

🔄 Current Status:
- Consumer successfully progresses through: FindCoordinator -> JoinGroup -> SyncGroup -> OffsetFetch
- Sarama consumer joins group, gets partition assignments, attempts offset fetching
- Issue: OffsetFetch TopicsCount parsing still incorrect (191128930 vs expected 1)

🎯 Next: Fix remaining OffsetFetch parsing to complete end-to-end consumer group functionality
This commit is contained in:
chrislu
2025-09-12 15:26:14 -07:00
parent 56608aead3
commit ccd80c2446
2 changed files with 20 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
weed/mq/kafka/protocol/joingroup.go
+14 -8
View File
@@ -272,7 +272,7 @@ func (h *Handler) parseJoinGroupRequest(data []byte) (*JoinGroupRequest, error)
// Skip client_id (part of JoinGroup v5 payload)
clientIDLength := int(binary.BigEndian.Uint16(data[offset:]))
offset += 2 + clientIDLength
fmt.Printf("DEBUG: JoinGroup v5 skipped client_id (%d bytes: '%s'), offset now: %d\n",
fmt.Printf("DEBUG: JoinGroup v5 skipped client_id (%d bytes: '%s'), offset now: %d\n",
clientIDLength, string(data[2:2+clientIDLength]), offset)
// GroupID (string)
@@ -324,7 +324,7 @@ func (h *Handler) parseJoinGroupRequest(data []byte) (*JoinGroupRequest, error)
}
instanceIDLength := int16(binary.BigEndian.Uint16(data[offset:]))
offset += 2
if instanceIDLength == -1 {
groupInstanceID = "" // null string
} else if instanceIDLength >= 0 {
@@ -334,8 +334,8 @@ func (h *Handler) parseJoinGroupRequest(data []byte) (*JoinGroupRequest, error)
groupInstanceID = string(data[offset : offset+int(instanceIDLength)])
offset += int(instanceIDLength)
}
fmt.Printf("DEBUG: JoinGroup v5 - MemberID: '%s', GroupInstanceID: '%s' (len=%d), offset now: %d\n",
fmt.Printf("DEBUG: JoinGroup v5 - MemberID: '%s', GroupInstanceID: '%s' (len=%d), offset now: %d\n",
memberID, groupInstanceID, instanceIDLength, offset)
// Parse Protocol Type
@@ -399,7 +399,6 @@ func (h *Handler) parseJoinGroupRequest(data []byte) (*JoinGroupRequest, error)
fmt.Printf("DEBUG: JoinGroup - Protocol: %s, MetadataLength: %d\n", protocolName, metadataLength)
}
return &JoinGroupRequest{
GroupID: groupID,
SessionTimeout: sessionTimeout,
@@ -773,6 +772,12 @@ func (h *Handler) parseSyncGroupRequest(data []byte) (*SyncGroupRequest, error)
offset := 0
// Skip client_id (part of SyncGroup v3 payload)
clientIDLength := int(binary.BigEndian.Uint16(data[offset:]))
offset += 2 + clientIDLength
fmt.Printf("DEBUG: SyncGroup v3 skipped client_id (%d bytes: '%s'), offset now: %d\n",
clientIDLength, string(data[2:2+clientIDLength]), offset)
// GroupID (string)
groupIDLength := int(binary.BigEndian.Uint16(data[offset:]))
offset += 2
@@ -822,6 +827,10 @@ func (h *Handler) buildSyncGroupResponse(response SyncGroupResponse) []byte {
binary.BigEndian.PutUint32(correlationIDBytes, response.CorrelationID)
result = append(result, correlationIDBytes...)
// SyncGroup v1+ has throttle_time_ms at the beginning
// Throttle time (4 bytes, 0 = no throttling)
result = append(result, 0, 0, 0, 0)
// Error code (2 bytes)
errorCodeBytes := make([]byte, 2)
binary.BigEndian.PutUint16(errorCodeBytes, uint16(response.ErrorCode))
@@ -833,9 +842,6 @@ func (h *Handler) buildSyncGroupResponse(response SyncGroupResponse) []byte {
result = append(result, assignmentLength...)
result = append(result, response.Assignment...)
// Throttle time (4 bytes, 0 = no throttling)
result = append(result, 0, 0, 0, 0)
return result
}
weed/mq/kafka/protocol/offset_management.go
+6
View File
@@ -404,6 +404,12 @@ func (h *Handler) parseOffsetFetchRequest(data []byte) (*OffsetFetchRequest, err
offset := 0
// Skip client_id (part of OffsetFetch payload)
clientIDLength := int(binary.BigEndian.Uint16(data[offset:]))
offset += 2 + clientIDLength
fmt.Printf("DEBUG: OffsetFetch skipped client_id (%d bytes: '%s'), offset now: %d\n",
clientIDLength, string(data[2:2+clientIDLength]), offset)
// GroupID (string)
groupIDLength := int(binary.BigEndian.Uint16(data[offset:]))
offset += 2