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package integration
import (
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"testing"
"time"
"github.com/seaweedfs/seaweedfs/test/kafka/internal/testutil"
)
// TestSchemaRegistryEventualConsistency reproduces the issue where schemas
// are registered successfully but are not immediately queryable due to
// Schema Registry's consumer lag
func TestSchemaRegistryEventualConsistency(t *testing.T) {
// This test requires real SMQ backend
gateway := testutil.NewGatewayTestServerWithSMQ(t, testutil.SMQRequired)
defer gateway.CleanupAndClose()
addr := gateway.StartAndWait()
t.Logf("Gateway running on %s", addr)
// Schema Registry URL from environment or default
schemaRegistryURL := "http://localhost:8081"
// Wait for Schema Registry to be ready
if !waitForSchemaRegistry(t, schemaRegistryURL, 30*time.Second) {
t.Fatal("Schema Registry not ready")
}
// Define test schemas
valueSchema := `{"type":"record","name":"TestMessage","fields":[{"name":"id","type":"string"}]}`
keySchema := `{"type":"string"}`
// Register multiple schemas rapidly (simulates the load test scenario)
subjects := []string{
"test-topic-0-value",
"test-topic-0-key",
"test-topic-1-value",
"test-topic-1-key",
"test-topic-2-value",
"test-topic-2-key",
"test-topic-3-value",
"test-topic-3-key",
}
t.Log("Registering schemas rapidly...")
registeredIDs := make(map[string]int)
for _, subject := range subjects {
schema := valueSchema
if strings.HasSuffix(subject, "-key") {
schema = keySchema
}
id, err := registerSchema(schemaRegistryURL, subject, schema)
if err != nil {
t.Fatalf("Failed to register schema for %s: %v", subject, err)
}
registeredIDs[subject] = id
t.Logf("Registered %s with ID %d", subject, id)
}
t.Log("All schemas registered successfully!")
// Now immediately try to verify them (this reproduces the bug)
t.Log("Immediately verifying schemas (without delay)...")
immediateFailures := 0
for _, subject := range subjects {
exists, id, version, err := verifySchema(schemaRegistryURL, subject)
if err != nil || !exists {
immediateFailures++
t.Logf("Immediate verification failed for %s: exists=%v id=%d err=%v", subject, exists, id, err)
} else {
t.Logf("Immediate verification passed for %s: ID=%d Version=%d", subject, id, version)
}
}
if immediateFailures > 0 {
t.Logf("BUG REPRODUCED: %d/%d schemas not immediately queryable after registration",
immediateFailures, len(subjects))
t.Logf(" This is due to Schema Registry's KafkaStoreReaderThread lag")
}
// Now verify with retry logic (this should succeed)
t.Log("Verifying schemas with retry logic...")
for _, subject := range subjects {
expectedID := registeredIDs[subject]
if !verifySchemaWithRetry(t, schemaRegistryURL, subject, expectedID, 5*time.Second) {
t.Errorf("Failed to verify %s even with retry", subject)
}
}
t.Log("✓ All schemas verified successfully with retry logic!")
}
// registerSchema registers a schema and returns its ID
func registerSchema(registryURL, subject, schema string) (int, error) {
// Escape the schema JSON
escapedSchema, err := json.Marshal(schema)
if err != nil {
return 0, err
}
payload := fmt.Sprintf(`{"schema":%s,"schemaType":"AVRO"}`, escapedSchema)
resp, err := http.Post(
fmt.Sprintf("%s/subjects/%s/versions", registryURL, subject),
"application/vnd.schemaregistry.v1+json",
strings.NewReader(payload),
)
if err != nil {
return 0, err
}
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
if resp.StatusCode != http.StatusOK {
return 0, fmt.Errorf("registration failed: %s - %s", resp.Status, string(body))
}
var result struct {
ID int `json:"id"`
}
if err := json.Unmarshal(body, &result); err != nil {
return 0, err
}
return result.ID, nil
}
// verifySchema checks if a schema exists
func verifySchema(registryURL, subject string) (exists bool, id int, version int, err error) {
resp, err := http.Get(fmt.Sprintf("%s/subjects/%s/versions/latest", registryURL, subject))
if err != nil {
return false, 0, 0, err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusNotFound {
return false, 0, 0, nil
}
if resp.StatusCode != http.StatusOK {
body, _ := io.ReadAll(resp.Body)
return false, 0, 0, fmt.Errorf("verification failed: %s - %s", resp.Status, string(body))
}
var result struct {
ID int `json:"id"`
Version int `json:"version"`
Schema string `json:"schema"`
}
body, _ := io.ReadAll(resp.Body)
if err := json.Unmarshal(body, &result); err != nil {
return false, 0, 0, err
}
return true, result.ID, result.Version, nil
}
// verifySchemaWithRetry verifies a schema with retry logic
func verifySchemaWithRetry(t *testing.T, registryURL, subject string, expectedID int, timeout time.Duration) bool {
deadline := time.Now().Add(timeout)
attempt := 0
for time.Now().Before(deadline) {
attempt++
exists, id, version, err := verifySchema(registryURL, subject)
if err == nil && exists && id == expectedID {
if attempt > 1 {
t.Logf("✓ %s verified after %d attempts (ID=%d, Version=%d)", subject, attempt, id, version)
}
return true
}
// Wait before retry (exponential backoff)
waitTime := time.Duration(attempt*100) * time.Millisecond
if waitTime > 1*time.Second {
waitTime = 1 * time.Second
}
time.Sleep(waitTime)
}
t.Logf("%s verification timed out after %d attempts", subject, attempt)
return false
}
// waitForSchemaRegistry waits for Schema Registry to be ready
func waitForSchemaRegistry(t *testing.T, url string, timeout time.Duration) bool {
deadline := time.Now().Add(timeout)
for time.Now().Before(deadline) {
resp, err := http.Get(url + "/subjects")
if err == nil && resp.StatusCode == http.StatusOK {
resp.Body.Close()
return true
}
if resp != nil {
resp.Body.Close()
}
time.Sleep(500 * time.Millisecond)
}
return false
}
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