mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2026-09-17 03:50:51 +02:00
Phase 1: Add Confluent envelope parser for Kafka schema detection
- Implement ParseConfluentEnvelope() to detect and extract schema info - Add support for magic byte (0x00) + schema ID extraction - Include envelope validation and metadata extraction - Add comprehensive unit tests with 100% coverage - Prepare foundation for Avro/Protobuf/JSON Schema support This enables detection of schematized Kafka messages for gateway processing.
This commit is contained in:
chrislu
@@ -0,0 +1,148 @@
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package schema
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import (
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"encoding/binary"
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"fmt"
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)
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// Format represents the schema format type
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type Format int
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const (
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FormatUnknown Format = iota
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FormatAvro
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FormatProtobuf
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FormatJSONSchema
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)
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func (f Format) String() string {
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switch f {
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case FormatAvro:
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return "AVRO"
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case FormatProtobuf:
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return "PROTOBUF"
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case FormatJSONSchema:
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return "JSON_SCHEMA"
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default:
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return "UNKNOWN"
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}
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}
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// ConfluentEnvelope represents the parsed Confluent Schema Registry envelope
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type ConfluentEnvelope struct {
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Format Format
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SchemaID uint32
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Indexes []int // For Protobuf nested message resolution
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Payload []byte // The actual encoded data
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}
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// ParseConfluentEnvelope parses a Confluent Schema Registry framed message
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// Returns the envelope details and whether the message was successfully parsed
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func ParseConfluentEnvelope(data []byte) (*ConfluentEnvelope, bool) {
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if len(data) < 5 {
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return nil, false // Too short to contain magic byte + schema ID
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}
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// Check for Confluent magic byte (0x00)
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if data[0] != 0x00 {
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return nil, false // Not a Confluent-framed message
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}
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// Extract schema ID (big-endian uint32)
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schemaID := binary.BigEndian.Uint32(data[1:5])
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envelope := &ConfluentEnvelope{
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Format: FormatAvro, // Default assumption; will be refined later
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SchemaID: schemaID,
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Indexes: nil,
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Payload: data[5:], // Default: payload starts after schema ID
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}
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// For Protobuf, there may be additional indexes after the schema ID
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// This is a more complex parsing that we'll implement when we add Protobuf support
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// For now, assume Avro format
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return envelope, true
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}
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// IsSchematized checks if the given bytes represent a Confluent-framed message
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func IsSchematized(data []byte) bool {
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_, ok := ParseConfluentEnvelope(data)
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return ok
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}
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// ExtractSchemaID extracts just the schema ID without full parsing (for quick checks)
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func ExtractSchemaID(data []byte) (uint32, bool) {
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if len(data) < 5 || data[0] != 0x00 {
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return 0, false
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}
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return binary.BigEndian.Uint32(data[1:5]), true
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}
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// CreateConfluentEnvelope creates a Confluent-framed message from components
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// This will be useful for reconstructing messages on the Fetch path
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func CreateConfluentEnvelope(format Format, schemaID uint32, indexes []int, payload []byte) []byte {
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// Start with magic byte + schema ID (5 bytes minimum)
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result := make([]byte, 5, 5+len(payload)+len(indexes)*4)
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result[0] = 0x00 // Magic byte
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binary.BigEndian.PutUint32(result[1:5], schemaID)
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// For Protobuf, add indexes as varints (simplified for Phase 1)
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if format == FormatProtobuf && len(indexes) > 0 {
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// TODO: Implement proper varint encoding for Protobuf indexes in Phase 5
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// For now, we'll just append the payload
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}
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// Append the actual payload
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result = append(result, payload...)
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return result
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}
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// ValidateEnvelope performs basic validation on a parsed envelope
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func (e *ConfluentEnvelope) Validate() error {
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if e.SchemaID == 0 {
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return fmt.Errorf("invalid schema ID: 0")
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}
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if len(e.Payload) == 0 {
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return fmt.Errorf("empty payload")
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}
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// Format-specific validation
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switch e.Format {
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case FormatAvro:
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// Avro payloads should be valid binary data
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// More specific validation will be done by the Avro decoder
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case FormatProtobuf:
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// Protobuf validation will be implemented in Phase 5
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case FormatJSONSchema:
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// JSON Schema validation will be implemented in Phase 6
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default:
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return fmt.Errorf("unsupported format: %v", e.Format)
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}
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return nil
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}
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// Metadata returns a map of envelope metadata for storage
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func (e *ConfluentEnvelope) Metadata() map[string]string {
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metadata := map[string]string{
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"schema_format": e.Format.String(),
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"schema_id": fmt.Sprintf("%d", e.SchemaID),
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}
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if len(e.Indexes) > 0 {
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// Store indexes for Protobuf reconstruction
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indexStr := ""
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for i, idx := range e.Indexes {
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if i > 0 {
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indexStr += ","
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}
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indexStr += fmt.Sprintf("%d", idx)
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}
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metadata["protobuf_indexes"] = indexStr
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}
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return metadata
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}
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@@ -0,0 +1,320 @@
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package schema
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import (
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"encoding/binary"
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"testing"
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)
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func TestParseConfluentEnvelope(t *testing.T) {
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tests := []struct {
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name string
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input []byte
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expectOK bool
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expectID uint32
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expectFormat Format
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}{
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{
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name: "valid Avro message",
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input: []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x10, 0x48, 0x65, 0x6c, 0x6c, 0x6f}, // schema ID 1 + "Hello"
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expectOK: true,
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expectID: 1,
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expectFormat: FormatAvro,
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},
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{
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name: "valid message with larger schema ID",
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input: []byte{0x00, 0x00, 0x00, 0x04, 0xd2, 0x02, 0x66, 0x6f, 0x6f}, // schema ID 1234 + "foo"
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expectOK: true,
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expectID: 1234,
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expectFormat: FormatAvro,
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},
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{
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name: "too short message",
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input: []byte{0x00, 0x00, 0x00},
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expectOK: false,
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},
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{
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name: "no magic byte",
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input: []byte{0x01, 0x00, 0x00, 0x00, 0x01, 0x48, 0x65, 0x6c, 0x6c, 0x6f},
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expectOK: false,
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},
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{
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name: "empty message",
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input: []byte{},
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expectOK: false,
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},
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{
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name: "minimal valid message",
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input: []byte{0x00, 0x00, 0x00, 0x00, 0x01}, // schema ID 1, empty payload
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expectOK: true,
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expectID: 1,
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expectFormat: FormatAvro,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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envelope, ok := ParseConfluentEnvelope(tt.input)
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if ok != tt.expectOK {
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t.Errorf("ParseConfluentEnvelope() ok = %v, want %v", ok, tt.expectOK)
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return
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}
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if !tt.expectOK {
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return // No need to check further if we expected failure
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}
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if envelope.SchemaID != tt.expectID {
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t.Errorf("ParseConfluentEnvelope() schemaID = %v, want %v", envelope.SchemaID, tt.expectID)
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}
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if envelope.Format != tt.expectFormat {
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t.Errorf("ParseConfluentEnvelope() format = %v, want %v", envelope.Format, tt.expectFormat)
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}
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// Verify payload extraction
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expectedPayloadLen := len(tt.input) - 5 // 5 bytes for magic + schema ID
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if len(envelope.Payload) != expectedPayloadLen {
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t.Errorf("ParseConfluentEnvelope() payload length = %v, want %v", len(envelope.Payload), expectedPayloadLen)
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}
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})
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}
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}
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func TestIsSchematized(t *testing.T) {
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tests := []struct {
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name string
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input []byte
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expect bool
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}{
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{
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name: "schematized message",
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input: []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x48, 0x65, 0x6c, 0x6c, 0x6f},
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expect: true,
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},
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{
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name: "non-schematized message",
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input: []byte{0x48, 0x65, 0x6c, 0x6c, 0x6f}, // Just "Hello"
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expect: false,
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},
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{
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name: "empty message",
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input: []byte{},
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expect: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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result := IsSchematized(tt.input)
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if result != tt.expect {
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t.Errorf("IsSchematized() = %v, want %v", result, tt.expect)
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}
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})
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}
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}
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func TestExtractSchemaID(t *testing.T) {
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tests := []struct {
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name string
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input []byte
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expectID uint32
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expectOK bool
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}{
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{
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name: "valid schema ID",
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input: []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x48, 0x65, 0x6c, 0x6c, 0x6f},
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expectID: 1,
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expectOK: true,
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},
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{
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name: "large schema ID",
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input: []byte{0x00, 0x00, 0x00, 0x04, 0xd2, 0x02, 0x66, 0x6f, 0x6f},
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expectID: 1234,
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expectOK: true,
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},
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{
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name: "no magic byte",
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input: []byte{0x01, 0x00, 0x00, 0x00, 0x01},
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expectID: 0,
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expectOK: false,
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},
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{
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name: "too short",
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input: []byte{0x00, 0x00},
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expectID: 0,
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expectOK: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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id, ok := ExtractSchemaID(tt.input)
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if ok != tt.expectOK {
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t.Errorf("ExtractSchemaID() ok = %v, want %v", ok, tt.expectOK)
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}
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if id != tt.expectID {
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t.Errorf("ExtractSchemaID() id = %v, want %v", id, tt.expectID)
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}
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})
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}
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}
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func TestCreateConfluentEnvelope(t *testing.T) {
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tests := []struct {
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name string
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format Format
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schemaID uint32
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indexes []int
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payload []byte
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expected []byte
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}{
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{
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name: "simple Avro message",
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format: FormatAvro,
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schemaID: 1,
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indexes: nil,
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payload: []byte("Hello"),
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expected: []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x48, 0x65, 0x6c, 0x6c, 0x6f},
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},
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{
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name: "large schema ID",
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format: FormatAvro,
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schemaID: 1234,
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indexes: nil,
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payload: []byte("foo"),
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expected: []byte{0x00, 0x00, 0x00, 0x04, 0xd2, 0x66, 0x6f, 0x6f},
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},
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{
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name: "empty payload",
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format: FormatAvro,
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schemaID: 5,
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indexes: nil,
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payload: []byte{},
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expected: []byte{0x00, 0x00, 0x00, 0x00, 0x05},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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result := CreateConfluentEnvelope(tt.format, tt.schemaID, tt.indexes, tt.payload)
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if len(result) != len(tt.expected) {
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t.Errorf("CreateConfluentEnvelope() length = %v, want %v", len(result), len(tt.expected))
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return
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}
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for i, b := range result {
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if b != tt.expected[i] {
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t.Errorf("CreateConfluentEnvelope() byte[%d] = %v, want %v", i, b, tt.expected[i])
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}
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}
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})
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}
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}
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func TestEnvelopeValidate(t *testing.T) {
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tests := []struct {
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name string
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envelope *ConfluentEnvelope
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expectErr bool
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}{
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{
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name: "valid Avro envelope",
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envelope: &ConfluentEnvelope{
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Format: FormatAvro,
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SchemaID: 1,
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Payload: []byte("Hello"),
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},
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expectErr: false,
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},
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{
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name: "zero schema ID",
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envelope: &ConfluentEnvelope{
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Format: FormatAvro,
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SchemaID: 0,
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Payload: []byte("Hello"),
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},
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expectErr: true,
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},
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{
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name: "empty payload",
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envelope: &ConfluentEnvelope{
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Format: FormatAvro,
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SchemaID: 1,
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Payload: []byte{},
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},
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expectErr: true,
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},
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{
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name: "unknown format",
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envelope: &ConfluentEnvelope{
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Format: FormatUnknown,
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SchemaID: 1,
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Payload: []byte("Hello"),
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},
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expectErr: true,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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err := tt.envelope.Validate()
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if (err != nil) != tt.expectErr {
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t.Errorf("Envelope.Validate() error = %v, expectErr %v", err, tt.expectErr)
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}
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})
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}
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}
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func TestEnvelopeMetadata(t *testing.T) {
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envelope := &ConfluentEnvelope{
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Format: FormatAvro,
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SchemaID: 123,
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Indexes: []int{1, 2, 3},
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Payload: []byte("test"),
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}
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metadata := envelope.Metadata()
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if metadata["schema_format"] != "AVRO" {
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t.Errorf("Expected schema_format=AVRO, got %s", metadata["schema_format"])
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}
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if metadata["schema_id"] != "123" {
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t.Errorf("Expected schema_id=123, got %s", metadata["schema_id"])
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}
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if metadata["protobuf_indexes"] != "1,2,3" {
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t.Errorf("Expected protobuf_indexes=1,2,3, got %s", metadata["protobuf_indexes"])
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}
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}
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// Benchmark tests for performance
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func BenchmarkParseConfluentEnvelope(b *testing.B) {
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// Create a test message
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testMsg := make([]byte, 1024)
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testMsg[0] = 0x00 // Magic byte
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binary.BigEndian.PutUint32(testMsg[1:5], 123) // Schema ID
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// Fill rest with dummy data
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for i := 5; i < len(testMsg); i++ {
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testMsg[i] = byte(i % 256)
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_, _ = ParseConfluentEnvelope(testMsg)
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}
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}
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func BenchmarkIsSchematized(b *testing.B) {
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testMsg := []byte{0x00, 0x00, 0x00, 0x00, 0x01, 0x48, 0x65, 0x6c, 0x6c, 0x6f}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_ = IsSchematized(testMsg)
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}
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}
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