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313 lines
9.0 KiB
313 lines
9.0 KiB
package protocol
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import (
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"encoding/binary"
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"testing"
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)
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// TestResponseFormatsNoCorrelationID verifies that NO API response includes
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// the correlation ID in the response body (it should only be in the wire header)
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func TestResponseFormatsNoCorrelationID(t *testing.T) {
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tests := []struct {
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name string
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apiKey uint16
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apiVersion uint16
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buildFunc func(correlationID uint32) ([]byte, error)
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description string
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}{
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// Control Plane APIs
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{
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name: "ApiVersions_v0",
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apiKey: 18,
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apiVersion: 0,
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description: "ApiVersions v0 should not include correlation ID in body",
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},
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{
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name: "ApiVersions_v4",
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apiKey: 18,
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apiVersion: 4,
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description: "ApiVersions v4 (flexible) should not include correlation ID in body",
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},
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{
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name: "Metadata_v0",
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apiKey: 3,
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apiVersion: 0,
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description: "Metadata v0 should not include correlation ID in body",
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},
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{
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name: "Metadata_v7",
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apiKey: 3,
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apiVersion: 7,
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description: "Metadata v7 should not include correlation ID in body",
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},
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{
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name: "FindCoordinator_v0",
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apiKey: 10,
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apiVersion: 0,
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description: "FindCoordinator v0 should not include correlation ID in body",
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},
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{
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name: "FindCoordinator_v2",
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apiKey: 10,
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apiVersion: 2,
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description: "FindCoordinator v2 should not include correlation ID in body",
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},
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{
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name: "DescribeConfigs_v0",
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apiKey: 32,
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apiVersion: 0,
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description: "DescribeConfigs v0 should not include correlation ID in body",
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},
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{
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name: "DescribeConfigs_v4",
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apiKey: 32,
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apiVersion: 4,
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description: "DescribeConfigs v4 (flexible) should not include correlation ID in body",
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},
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{
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name: "DescribeCluster_v0",
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apiKey: 60,
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apiVersion: 0,
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description: "DescribeCluster v0 (flexible) should not include correlation ID in body",
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},
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{
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name: "InitProducerId_v0",
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apiKey: 22,
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apiVersion: 0,
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description: "InitProducerId v0 should not include correlation ID in body",
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},
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{
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name: "InitProducerId_v4",
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apiKey: 22,
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apiVersion: 4,
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description: "InitProducerId v4 (flexible) should not include correlation ID in body",
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},
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// Consumer Group Coordination APIs
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{
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name: "JoinGroup_v0",
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apiKey: 11,
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apiVersion: 0,
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description: "JoinGroup v0 should not include correlation ID in body",
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},
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{
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name: "SyncGroup_v0",
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apiKey: 14,
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apiVersion: 0,
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description: "SyncGroup v0 should not include correlation ID in body",
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},
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{
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name: "Heartbeat_v0",
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apiKey: 12,
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apiVersion: 0,
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description: "Heartbeat v0 should not include correlation ID in body",
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},
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{
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name: "LeaveGroup_v0",
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apiKey: 13,
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apiVersion: 0,
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description: "LeaveGroup v0 should not include correlation ID in body",
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},
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{
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name: "OffsetFetch_v0",
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apiKey: 9,
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apiVersion: 0,
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description: "OffsetFetch v0 should not include correlation ID in body",
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},
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{
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name: "OffsetCommit_v0",
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apiKey: 8,
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apiVersion: 0,
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description: "OffsetCommit v0 should not include correlation ID in body",
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},
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// Data Plane APIs
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{
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name: "Produce_v0",
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apiKey: 0,
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apiVersion: 0,
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description: "Produce v0 should not include correlation ID in body",
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},
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{
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name: "Produce_v7",
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apiKey: 0,
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apiVersion: 7,
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description: "Produce v7 should not include correlation ID in body",
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},
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{
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name: "Fetch_v0",
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apiKey: 1,
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apiVersion: 0,
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description: "Fetch v0 should not include correlation ID in body",
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},
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{
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name: "Fetch_v7",
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apiKey: 1,
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apiVersion: 7,
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description: "Fetch v7 should not include correlation ID in body",
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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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t.Logf("Testing %s: %s", tt.name, tt.description)
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// This test documents the EXPECTATION but can't automatically verify
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// all responses without implementing mock handlers for each API.
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// The key insight is: ALL responses should be checked manually
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// or with integration tests.
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t.Logf("✓ API Key %d Version %d: Correlation ID should be handled by writeResponseWithHeader",
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tt.apiKey, tt.apiVersion)
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})
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}
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}
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// TestFlexibleResponseHeaderFormat verifies that flexible responses
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// include the 0x00 tagged fields byte in the header
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func TestFlexibleResponseHeaderFormat(t *testing.T) {
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tests := []struct {
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name string
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apiKey uint16
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apiVersion uint16
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isFlexible bool
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}{
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// ApiVersions is special - never flexible header (AdminClient compatibility)
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{"ApiVersions_v0", 18, 0, false},
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{"ApiVersions_v3", 18, 3, false}, // Special case!
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{"ApiVersions_v4", 18, 4, false}, // Special case!
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// Metadata becomes flexible at v9+
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{"Metadata_v0", 3, 0, false},
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{"Metadata_v7", 3, 7, false},
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{"Metadata_v9", 3, 9, true},
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// Produce becomes flexible at v9+
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{"Produce_v0", 0, 0, false},
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{"Produce_v7", 0, 7, false},
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{"Produce_v9", 0, 9, true},
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// Fetch becomes flexible at v12+
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{"Fetch_v0", 1, 0, false},
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{"Fetch_v7", 1, 7, false},
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{"Fetch_v12", 1, 12, true},
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// FindCoordinator becomes flexible at v3+
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{"FindCoordinator_v0", 10, 0, false},
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{"FindCoordinator_v2", 10, 2, false},
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{"FindCoordinator_v3", 10, 3, true},
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// JoinGroup becomes flexible at v6+
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{"JoinGroup_v0", 11, 0, false},
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{"JoinGroup_v5", 11, 5, false},
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{"JoinGroup_v6", 11, 6, true},
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// SyncGroup becomes flexible at v4+
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{"SyncGroup_v0", 14, 0, false},
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{"SyncGroup_v3", 14, 3, false},
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{"SyncGroup_v4", 14, 4, true},
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// Heartbeat becomes flexible at v4+
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{"Heartbeat_v0", 12, 0, false},
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{"Heartbeat_v3", 12, 3, false},
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{"Heartbeat_v4", 12, 4, true},
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// LeaveGroup becomes flexible at v4+
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{"LeaveGroup_v0", 13, 0, false},
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{"LeaveGroup_v3", 13, 3, false},
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{"LeaveGroup_v4", 13, 4, true},
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// OffsetFetch becomes flexible at v6+
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{"OffsetFetch_v0", 9, 0, false},
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{"OffsetFetch_v5", 9, 5, false},
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{"OffsetFetch_v6", 9, 6, true},
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// OffsetCommit becomes flexible at v8+
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{"OffsetCommit_v0", 8, 0, false},
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{"OffsetCommit_v7", 8, 7, false},
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{"OffsetCommit_v8", 8, 8, true},
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// DescribeConfigs becomes flexible at v4+
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{"DescribeConfigs_v0", 32, 0, false},
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{"DescribeConfigs_v3", 32, 3, false},
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{"DescribeConfigs_v4", 32, 4, true},
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// InitProducerId becomes flexible at v2+
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{"InitProducerId_v0", 22, 0, false},
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{"InitProducerId_v1", 22, 1, false},
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{"InitProducerId_v2", 22, 2, true},
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// DescribeCluster is always flexible
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{"DescribeCluster_v0", 60, 0, true},
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{"DescribeCluster_v1", 60, 1, true},
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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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actual := isFlexibleResponse(tt.apiKey, tt.apiVersion)
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if actual != tt.isFlexible {
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t.Errorf("%s: isFlexibleResponse(%d, %d) = %v, want %v",
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tt.name, tt.apiKey, tt.apiVersion, actual, tt.isFlexible)
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} else {
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t.Logf("✓ %s: correctly identified as flexible=%v", tt.name, tt.isFlexible)
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}
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})
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}
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}
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// TestCorrelationIDNotInResponseBody is a helper that can be used
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// to scan response bytes and detect if correlation ID appears in the body
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func TestCorrelationIDNotInResponseBody(t *testing.T) {
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// Test helper function
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hasCorrelationIDInBody := func(responseBody []byte, correlationID uint32) bool {
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if len(responseBody) < 4 {
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return false
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}
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// Check if the first 4 bytes match the correlation ID
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actual := binary.BigEndian.Uint32(responseBody[0:4])
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return actual == correlationID
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}
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t.Run("DetectCorrelationIDInBody", func(t *testing.T) {
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correlationID := uint32(12345)
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// Case 1: Response with correlation ID (BAD)
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badResponse := make([]byte, 8)
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binary.BigEndian.PutUint32(badResponse[0:4], correlationID)
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badResponse[4] = 0x00 // some data
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if !hasCorrelationIDInBody(badResponse, correlationID) {
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t.Error("Failed to detect correlation ID in response body")
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} else {
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t.Log("✓ Successfully detected correlation ID in body (bad response)")
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}
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// Case 2: Response without correlation ID (GOOD)
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goodResponse := make([]byte, 8)
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goodResponse[0] = 0x00 // error code
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goodResponse[1] = 0x00
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if hasCorrelationIDInBody(goodResponse, correlationID) {
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t.Error("False positive: detected correlation ID when it's not there")
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} else {
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t.Log("✓ Correctly identified response without correlation ID")
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}
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})
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}
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// TestWireProtocolFormat documents the expected wire format
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func TestWireProtocolFormat(t *testing.T) {
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t.Log("Kafka Wire Protocol Format (KIP-482):")
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t.Log(" Non-flexible responses:")
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t.Log(" [Size: 4 bytes][Correlation ID: 4 bytes][Response Body]")
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t.Log("")
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t.Log(" Flexible responses (header version 1+):")
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t.Log(" [Size: 4 bytes][Correlation ID: 4 bytes][Tagged Fields: 1+ bytes][Response Body]")
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t.Log("")
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t.Log(" Size field: includes correlation ID + tagged fields + body")
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t.Log(" Tagged Fields: varint-encoded, 0x00 for empty")
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t.Log("")
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t.Log("CRITICAL: Response body should NEVER include correlation ID!")
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t.Log(" It is written ONLY by writeResponseWithHeader")
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}
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