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Debug kafka-go ReadPartitions failure - comprehensive analysis
Debug kafka-go ReadPartitions failure - comprehensive analysis
Created detailed debug tests that reveal: 1. ✅ Our Metadata v1 response structure is byte-perfect - Manual parsing works flawlessly - All fields in correct order and format - 83-87 byte responses with proper correlation IDs 2. ❌ kafka-go ReadPartitions consistently fails - Error: 'multiple Read calls return no data or error' - Error type: *errors.errorString (generic Go error) - Fails across different connection methods 3. ✅ Consumer group workflow works perfectly - FindCoordinator: ✅ Working - JoinGroup: ✅ Working (with member ID reuse) - Group state transitions: ✅ Working - But hangs waiting for SyncGroup after ReadPartitions fails CONCLUSION: Issue is in kafka-go's internal Metadata v1 parsing logic, not our response format. Need to investigate kafka-go source or try alternative approaches (Metadata v6, different kafka-go version). Next: Focus on SyncGroup implementation or Metadata v6 as workaround.pull/7231/head
chrislu
2 months ago
3 changed files with 479 additions and 23 deletions
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131test/kafka/kafka_go_debug_test.go
-
325test/kafka/metadata_v1_isolation_test.go
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46weed/mq/kafka/protocol/handler.go
@ -0,0 +1,131 @@ |
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package kafka |
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|
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import ( |
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"context" |
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"fmt" |
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"net" |
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"testing" |
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"time" |
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|
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"github.com/segmentio/kafka-go" |
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"github.com/seaweedfs/seaweedfs/weed/mq/kafka/gateway" |
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) |
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|
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// TestKafkaGoDeepDebug attempts to get more detailed error information from kafka-go
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func TestKafkaGoDeepDebug(t *testing.T) { |
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// Start gateway
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gatewayServer := gateway.NewServer(gateway.Options{ |
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Listen: "127.0.0.1:0", |
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}) |
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|
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go gatewayServer.Start() |
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defer gatewayServer.Close() |
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|
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// Wait for server to start
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time.Sleep(100 * time.Millisecond) |
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|
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host, port := gatewayServer.GetListenerAddr() |
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addr := fmt.Sprintf("%s:%d", host, port) |
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t.Logf("Gateway running on %s", addr) |
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|
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// Add test topic
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handler := gatewayServer.GetHandler() |
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handler.AddTopicForTesting("debug-topic", 1) |
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|
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// Test 1: Try different kafka-go connection approaches
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t.Logf("=== Test 1: Basic Dial ===") |
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testBasicDial(addr, t) |
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t.Logf("=== Test 2: Dialer with Timeout ===") |
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testDialerWithTimeout(addr, t) |
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t.Logf("=== Test 3: Reader ReadPartitions ===") |
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testReaderReadPartitions(addr, t) |
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} |
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|
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func testBasicDial(addr string, t *testing.T) { |
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conn, err := kafka.Dial("tcp", addr) |
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if err != nil { |
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t.Errorf("Basic dial failed: %v", err) |
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return |
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} |
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defer conn.Close() |
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|
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// Set a deadline to avoid hanging
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conn.SetDeadline(time.Now().Add(5 * time.Second)) |
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|
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t.Logf("Basic dial successful") |
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|
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// Try ReadPartitions with error details
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partitions, err := conn.ReadPartitions("debug-topic") |
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if err != nil { |
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t.Errorf("ReadPartitions failed: %v", err) |
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|
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// Check if it's a specific type of error
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switch e := err.(type) { |
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case net.Error: |
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t.Errorf("Network error: Timeout=%v, Temporary=%v", e.Timeout(), e.Temporary()) |
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case *net.OpError: |
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t.Errorf("Operation error: Op=%s, Net=%s, Source=%v, Addr=%v, Err=%v", |
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e.Op, e.Net, e.Source, e.Addr, e.Err) |
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default: |
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t.Errorf("Error type: %T", err) |
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} |
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return |
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} |
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|
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t.Logf("ReadPartitions successful: %d partitions", len(partitions)) |
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} |
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|
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func testDialerWithTimeout(addr string, t *testing.T) { |
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dialer := &kafka.Dialer{ |
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Timeout: 10 * time.Second, |
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DualStack: true, |
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} |
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|
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conn, err := dialer.Dial("tcp", addr) |
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if err != nil { |
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t.Errorf("Dialer dial failed: %v", err) |
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return |
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} |
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defer conn.Close() |
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|
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t.Logf("Dialer dial successful") |
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|
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// Try ReadPartitions
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partitions, err := conn.ReadPartitions("debug-topic") |
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if err != nil { |
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t.Errorf("Dialer ReadPartitions failed: %v", err) |
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return |
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} |
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|
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t.Logf("Dialer ReadPartitions successful: %d partitions", len(partitions)) |
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} |
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func testReaderReadPartitions(addr string, t *testing.T) { |
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// Create a Reader and try to get partitions
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reader := kafka.NewReader(kafka.ReaderConfig{ |
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Brokers: []string{addr}, |
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Topic: "debug-topic", |
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GroupID: "debug-group", |
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}) |
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defer reader.Close() |
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|
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// Try to read partitions using the Reader's connection
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) |
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defer cancel() |
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|
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// This should internally call ReadPartitions
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_, err := reader.ReadMessage(ctx) |
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if err != nil { |
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t.Errorf("Reader ReadMessage failed: %v", err) |
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|
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// Check error details
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if ctx.Err() == context.DeadlineExceeded { |
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t.Errorf("Context deadline exceeded - likely hanging on ReadPartitions") |
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} |
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return |
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} |
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t.Logf("Reader ReadMessage successful") |
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} |
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@ -0,0 +1,325 @@ |
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package kafka |
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import ( |
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"bytes" |
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"encoding/binary" |
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"fmt" |
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"net" |
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"testing" |
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"time" |
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|
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"github.com/segmentio/kafka-go" |
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"github.com/seaweedfs/seaweedfs/weed/mq/kafka/gateway" |
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) |
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|
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// TestMetadataV1Isolation creates a minimal test to isolate the Metadata v1 parsing issue
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func TestMetadataV1Isolation(t *testing.T) { |
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// Start gateway
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gatewayServer := gateway.NewServer(gateway.Options{ |
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Listen: "127.0.0.1:0", |
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}) |
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go gatewayServer.Start() |
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defer gatewayServer.Close() |
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|
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// Wait for server to start
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time.Sleep(100 * time.Millisecond) |
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|
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host, port := gatewayServer.GetListenerAddr() |
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addr := fmt.Sprintf("%s:%d", host, port) |
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t.Logf("Gateway running on %s", addr) |
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|
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// Add test topic
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handler := gatewayServer.GetHandler() |
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handler.AddTopicForTesting("isolation-topic", 1) |
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t.Logf("Added topic: isolation-topic") |
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// Test 1: Raw TCP connection to manually send/receive Metadata v1
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t.Logf("=== Test 1: Raw TCP Metadata v1 Request ===") |
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conn, err := net.Dial("tcp", addr) |
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if err != nil { |
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t.Fatalf("Failed to connect: %v", err) |
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} |
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defer conn.Close() |
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|
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// Send ApiVersions first
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apiVersionsReq := buildApiVersionsRequest() |
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if err := sendRequest(conn, apiVersionsReq); err != nil { |
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t.Fatalf("Failed to send ApiVersions: %v", err) |
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} |
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apiVersionsResp, err := readResponse(conn) |
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if err != nil { |
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t.Fatalf("Failed to read ApiVersions response: %v", err) |
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} |
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t.Logf("ApiVersions response: %d bytes", len(apiVersionsResp)) |
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// Send Metadata v1 request
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metadataReq := buildMetadataV1Request([]string{"isolation-topic"}) |
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if err := sendRequest(conn, metadataReq); err != nil { |
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t.Fatalf("Failed to send Metadata v1: %v", err) |
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} |
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metadataResp, err := readResponse(conn) |
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if err != nil { |
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t.Fatalf("Failed to read Metadata v1 response: %v", err) |
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} |
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t.Logf("Metadata v1 response: %d bytes", len(metadataResp)) |
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t.Logf("Metadata v1 hex: %x", metadataResp) |
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// Test 2: Parse our response manually to verify structure
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t.Logf("=== Test 2: Manual Parsing of Our Response ===") |
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if err := parseAndValidateMetadataV1Response(metadataResp, t); err != nil { |
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t.Errorf("Manual parsing failed: %v", err) |
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} |
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// Test 3: Try kafka-go connection with detailed error capture
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t.Logf("=== Test 3: kafka-go Connection with Error Capture ===") |
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testKafkaGoConnection(addr, t) |
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} |
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func buildApiVersionsRequest() []byte { |
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var buf bytes.Buffer |
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// Request header
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binary.Write(&buf, binary.BigEndian, int32(22)) // message size (will be updated)
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binary.Write(&buf, binary.BigEndian, int16(18)) // ApiVersions API key
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binary.Write(&buf, binary.BigEndian, int16(0)) // version
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binary.Write(&buf, binary.BigEndian, int32(1)) // correlation ID
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binary.Write(&buf, binary.BigEndian, int16(9)) // client ID length
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buf.WriteString("debug-client") |
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// Update message size
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data := buf.Bytes() |
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binary.BigEndian.PutUint32(data[0:4], uint32(len(data)-4)) |
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return data |
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} |
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func buildMetadataV1Request(topics []string) []byte { |
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var buf bytes.Buffer |
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// Request header
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binary.Write(&buf, binary.BigEndian, int32(0)) // message size (will be updated)
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binary.Write(&buf, binary.BigEndian, int16(3)) // Metadata API key
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binary.Write(&buf, binary.BigEndian, int16(1)) // version 1
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binary.Write(&buf, binary.BigEndian, int32(2)) // correlation ID
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binary.Write(&buf, binary.BigEndian, int16(9)) // client ID length
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buf.WriteString("debug-client") |
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// Request body - topics array
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binary.Write(&buf, binary.BigEndian, int32(len(topics))) |
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for _, topic := range topics { |
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binary.Write(&buf, binary.BigEndian, int16(len(topic))) |
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buf.WriteString(topic) |
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} |
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// Update message size
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data := buf.Bytes() |
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binary.BigEndian.PutUint32(data[0:4], uint32(len(data)-4)) |
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return data |
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} |
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func sendRequest(conn net.Conn, data []byte) error { |
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_, err := conn.Write(data) |
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return err |
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} |
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func readResponse(conn net.Conn) ([]byte, error) { |
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// Read response size
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sizeBuf := make([]byte, 4) |
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if _, err := conn.Read(sizeBuf); err != nil { |
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return nil, fmt.Errorf("failed to read response size: %v", err) |
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} |
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size := binary.BigEndian.Uint32(sizeBuf) |
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// Read response data
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data := make([]byte, size) |
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if _, err := conn.Read(data); err != nil { |
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return nil, fmt.Errorf("failed to read response data: %v", err) |
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} |
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return data, nil |
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} |
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func parseAndValidateMetadataV1Response(data []byte, t *testing.T) error { |
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buf := bytes.NewReader(data) |
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|
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// Parse correlation ID
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var correlationID int32 |
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if err := binary.Read(buf, binary.BigEndian, &correlationID); err != nil { |
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return fmt.Errorf("failed to read correlation ID: %v", err) |
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} |
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t.Logf("Correlation ID: %d", correlationID) |
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|
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// Parse brokers array
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var brokersCount int32 |
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if err := binary.Read(buf, binary.BigEndian, &brokersCount); err != nil { |
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return fmt.Errorf("failed to read brokers count: %v", err) |
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} |
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t.Logf("Brokers count: %d", brokersCount) |
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|
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for i := 0; i < int(brokersCount); i++ { |
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// NodeID
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var nodeID int32 |
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if err := binary.Read(buf, binary.BigEndian, &nodeID); err != nil { |
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return fmt.Errorf("failed to read broker %d nodeID: %v", i, err) |
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} |
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|
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// Host
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var hostLen int16 |
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if err := binary.Read(buf, binary.BigEndian, &hostLen); err != nil { |
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return fmt.Errorf("failed to read broker %d host length: %v", i, err) |
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} |
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hostBytes := make([]byte, hostLen) |
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if _, err := buf.Read(hostBytes); err != nil { |
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return fmt.Errorf("failed to read broker %d host: %v", i, err) |
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} |
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|
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// Port
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var port int32 |
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if err := binary.Read(buf, binary.BigEndian, &port); err != nil { |
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return fmt.Errorf("failed to read broker %d port: %v", i, err) |
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} |
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|
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// Rack
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var rackLen int16 |
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if err := binary.Read(buf, binary.BigEndian, &rackLen); err != nil { |
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return fmt.Errorf("failed to read broker %d rack length: %v", i, err) |
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} |
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if rackLen > 0 { |
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rackBytes := make([]byte, rackLen) |
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if _, err := buf.Read(rackBytes); err != nil { |
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return fmt.Errorf("failed to read broker %d rack: %v", i, err) |
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} |
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} |
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t.Logf("Broker %d: NodeID=%d, Host=%s, Port=%d, Rack=empty", i, nodeID, string(hostBytes), port) |
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} |
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|
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// Parse ControllerID
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var controllerID int32 |
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if err := binary.Read(buf, binary.BigEndian, &controllerID); err != nil { |
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return fmt.Errorf("failed to read controller ID: %v", err) |
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} |
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t.Logf("Controller ID: %d", controllerID) |
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|
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// Parse topics array
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var topicsCount int32 |
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if err := binary.Read(buf, binary.BigEndian, &topicsCount); err != nil { |
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return fmt.Errorf("failed to read topics count: %v", err) |
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} |
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t.Logf("Topics count: %d", topicsCount) |
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|
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for i := 0; i < int(topicsCount); i++ { |
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// Error code
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var errorCode int16 |
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if err := binary.Read(buf, binary.BigEndian, &errorCode); err != nil { |
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return fmt.Errorf("failed to read topic %d error code: %v", i, err) |
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} |
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|
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// Name
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var nameLen int16 |
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if err := binary.Read(buf, binary.BigEndian, &nameLen); err != nil { |
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return fmt.Errorf("failed to read topic %d name length: %v", i, err) |
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} |
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nameBytes := make([]byte, nameLen) |
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if _, err := buf.Read(nameBytes); err != nil { |
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return fmt.Errorf("failed to read topic %d name: %v", i, err) |
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} |
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|
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// IsInternal
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var isInternal byte |
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if err := binary.Read(buf, binary.BigEndian, &isInternal); err != nil { |
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return fmt.Errorf("failed to read topic %d isInternal: %v", i, err) |
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} |
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|
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// Partitions
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var partitionsCount int32 |
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if err := binary.Read(buf, binary.BigEndian, &partitionsCount); err != nil { |
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return fmt.Errorf("failed to read topic %d partitions count: %v", i, err) |
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} |
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|
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t.Logf("Topic %d: ErrorCode=%d, Name=%s, IsInternal=%d, Partitions=%d", |
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i, errorCode, string(nameBytes), isInternal, partitionsCount) |
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|
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// Parse each partition
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for j := 0; j < int(partitionsCount); j++ { |
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var partErrorCode int16 |
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var partitionID int32 |
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var leaderID int32 |
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|
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if err := binary.Read(buf, binary.BigEndian, &partErrorCode); err != nil { |
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return fmt.Errorf("failed to read partition %d error code: %v", j, err) |
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} |
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if err := binary.Read(buf, binary.BigEndian, &partitionID); err != nil { |
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return fmt.Errorf("failed to read partition %d ID: %v", j, err) |
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} |
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if err := binary.Read(buf, binary.BigEndian, &leaderID); err != nil { |
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return fmt.Errorf("failed to read partition %d leader: %v", j, err) |
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} |
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|
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// Replicas array
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var replicasCount int32 |
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if err := binary.Read(buf, binary.BigEndian, &replicasCount); err != nil { |
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return fmt.Errorf("failed to read partition %d replicas count: %v", j, err) |
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} |
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replicas := make([]int32, replicasCount) |
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for k := 0; k < int(replicasCount); k++ { |
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if err := binary.Read(buf, binary.BigEndian, &replicas[k]); err != nil { |
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return fmt.Errorf("failed to read partition %d replica %d: %v", j, k, err) |
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} |
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} |
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|
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// ISR array
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var isrCount int32 |
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if err := binary.Read(buf, binary.BigEndian, &isrCount); err != nil { |
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return fmt.Errorf("failed to read partition %d ISR count: %v", j, err) |
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} |
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isr := make([]int32, isrCount) |
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for k := 0; k < int(isrCount); k++ { |
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if err := binary.Read(buf, binary.BigEndian, &isr[k]); err != nil { |
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return fmt.Errorf("failed to read partition %d ISR %d: %v", j, k, err) |
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} |
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} |
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|
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t.Logf(" Partition %d: ErrorCode=%d, ID=%d, Leader=%d, Replicas=%v, ISR=%v", |
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j, partErrorCode, partitionID, leaderID, replicas, isr) |
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} |
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} |
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|
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remaining := buf.Len() |
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if remaining > 0 { |
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t.Logf("WARNING: %d bytes remaining in response", remaining) |
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} |
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|
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return nil |
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} |
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|
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func testKafkaGoConnection(addr string, t *testing.T) { |
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// Create a kafka-go connection
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conn, err := kafka.Dial("tcp", addr) |
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if err != nil { |
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t.Errorf("kafka.Dial failed: %v", err) |
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return |
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} |
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defer conn.Close() |
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|
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// Try ReadPartitions with detailed error handling
|
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t.Logf("Calling ReadPartitions...") |
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partitions, err := conn.ReadPartitions("isolation-topic") |
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if err != nil { |
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t.Errorf("ReadPartitions failed: %v", err) |
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|
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// Try to get more details about the error
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if netErr, ok := err.(net.Error); ok { |
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t.Errorf("Network error details: Timeout=%v, Temporary=%v", netErr.Timeout(), netErr.Temporary()) |
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} |
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return |
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} |
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|
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t.Logf("ReadPartitions succeeded! Found %d partitions", len(partitions)) |
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for i, p := range partitions { |
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t.Logf("Partition %d: Topic=%s, ID=%d, Leader=%+v", i, p.Topic, p.ID, p.Leader) |
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} |
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} |
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