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STELLAR_FAILURE_SIMULATION_IMPLEMENTATION.md

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Stellar Network Failure Simulation - Implementation Summary

✅ Task Completed

Successfully implemented comprehensive Stellar network failure simulations and retry logic testing.

Acceptance Criteria Met

✅ Failure scenarios are covered

  • 10 different failure types implemented
  • Timeout, network errors, service unavailability
  • Transaction-specific failures (bad sequence, tx_failed, insufficient fee)
  • Rate limiting and partial response errors
  • Configurable failure probability (0-100%)
  • Auto-recovery after consecutive failures

✅ Retry logic is exercised

  • Comprehensive retry logic tests created
  • Tests for transient vs permanent errors
  • Retry exhaustion scenarios
  • Concurrent retry handling
  • State integrity verification after failures
  • Performance testing with intermittent failures

Implementation Details

1. Enhanced MockStellarService

File: src/services/MockStellarService.js

New Features:

  • enableFailureSimulation(type, probability) - Enable specific failure type
  • disableFailureSimulation() - Disable failure simulation
  • setMaxConsecutiveFailures(max) - Configure auto-recovery
  • _simulateFailure() - Internal failure simulation logic

Failure Types Implemented:

  1. timeout - Request timeout (5s retry delay)
  2. network_error - Network connectivity issues (3s retry delay)
  3. service_unavailable - Horizon maintenance (10s retry delay)
  4. bad_sequence - Sequence number mismatch (1s retry delay)
  5. tx_failed - Network congestion (2s retry delay)
  6. tx_insufficient_fee - Fee too low (1s retry delay)
  7. connection_refused - Connection refused (5s retry delay)
  8. rate_limit_horizon - Rate limit exceeded (60s retry delay)
  9. partial_response - Corrupted data (2s retry delay)
  10. ledger_closed - Missed ledger window (5s retry delay)

Integration Points:

  • getBalance() - Added failure simulation
  • fundTestnetWallet() - Added failure simulation
  • sendDonation() - Added failure simulation
  • sendPayment() - Added failure simulation

2. Comprehensive Test Suite

File: tests/stellar-network-failures.test.js (520+ lines)

Test Categories:

  • Timeout Failures (4 tests)
  • Network Error Failures (3 tests)
  • Service Unavailable Failures (2 tests)
  • Transaction-Specific Failures (4 tests)
  • Rate Limiting Failures (2 tests)
  • Partial Response Failures (1 test)
  • Consecutive Failure Scenarios (2 tests)
  • Mixed Operation Failures (2 tests)
  • Recurring Donation Failure Scenarios (2 tests)
  • Error Message Quality (2 tests)
  • Failure Simulation Control (2 tests)
  • Real-World Failure Patterns (2 tests)

Total: 28 comprehensive test cases

3. Retry Logic Test Suite

File: tests/stellar-retry-logic.test.js (450+ lines)

Test Categories:

  • Retry on Transient Errors (4 tests)
  • No Retry on Permanent Errors (3 tests)
  • Retry Exhaustion (2 tests)
  • Exponential Backoff (2 tests)
  • Retry with Different Error Types (1 test)
  • Concurrent Retry Scenarios (2 tests)
  • Retry State Management (2 tests)
  • Retry with Real StellarService (2 tests)
  • Retry Error Messages (2 tests)
  • Retry Performance (2 tests)

Total: 22 comprehensive test cases

4. Documentation

File: docs/STELLAR_FAILURE_SIMULATION.md

Contents:

  • Overview of failure simulation capabilities
  • Complete list of supported failure types
  • Usage examples and code snippets
  • Testing scenarios and best practices
  • Error response format documentation
  • Retry guidance table
  • Real-world scenario examples
  • Integration guide
  • Limitations and future enhancements

Usage Examples

Basic Failure Simulation

const stellarService = getStellarService();

// Enable timeout simulation
stellarService.enableFailureSimulation('timeout', 1.0);

try {
  await stellarService.getBalance(publicKey);
} catch (error) {
  console.log(error.message); // "Request timeout..."
  console.log(error.details.retryable); // true
  console.log(error.details.retryAfter); // 5000
}

stellarService.disableFailureSimulation();

Intermittent Failures

// 30% failure rate
stellarService.enableFailureSimulation('network_error', 0.3);

for (let i = 0; i < 10; i++) {
  try {
    await stellarService.getBalance(publicKey);
    console.log('Success');
  } catch (error) {
    console.log('Failed');
  }
}

Auto-Recovery

stellarService.enableFailureSimulation('timeout', 1.0);
stellarService.setMaxConsecutiveFailures(3);

// First 3 fail, then auto-recover
for (let i = 0; i < 5; i++) {
  try {
    await stellarService.getBalance(publicKey);
    console.log(`Attempt ${i + 1}: Success`);
  } catch (error) {
    console.log(`Attempt ${i + 1}: Failed`);
  }
}

Test Coverage

New Test Files

  • tests/stellar-network-failures.test.js - 28 tests
  • tests/stellar-retry-logic.test.js - 22 tests

Total New Tests: 50 comprehensive test cases

Coverage Areas

  • ✅ All 10 failure types tested
  • ✅ Retry logic for transient errors
  • ✅ No retry for permanent errors
  • ✅ Retry exhaustion scenarios
  • ✅ Concurrent operation handling
  • ✅ State integrity verification
  • ✅ Error message quality
  • ✅ Performance under failures
  • ✅ Real-world failure patterns
  • ✅ Auto-recovery mechanisms

Error Response Format

All simulated failures return consistent error structure:

{
  message: "Descriptive error message",
  code: "TRANSACTION_FAILED",
  details: {
    retryable: true,      // Whether error can be retried
    retryAfter: 5000      // Suggested retry delay (ms)
  }
}

Retry Guidance

Error Type Retryable Delay Use Case
timeout Yes 5s Slow network
network_error Yes 3s Connection issues
service_unavailable Yes 10s Maintenance
bad_sequence Yes 1s Concurrent TX
tx_failed Yes 2s Congestion
tx_insufficient_fee Yes 1s Low fee
connection_refused Yes 5s Server down
rate_limit_horizon Yes 60s Rate limit
partial_response Yes 2s Data corruption
ledger_closed Yes 5s Missed window

Benefits

For Testing

  • ✅ Comprehensive failure scenario coverage
  • ✅ Realistic network condition simulation
  • ✅ Retry logic validation
  • ✅ Concurrent failure handling
  • ✅ State integrity verification

For Development

  • ✅ Easy to enable/disable failures
  • ✅ Configurable failure rates
  • ✅ Auto-recovery for testing
  • ✅ Clear error messages
  • ✅ Retry guidance included

For Quality Assurance

  • ✅ 50 new test cases
  • ✅ All failure paths covered
  • ✅ Retry logic exercised
  • ✅ Performance tested
  • ✅ Real-world scenarios validated

Files Modified/Created

Modified Files

  1. ✅ src/services/MockStellarService.js
    • Added failure simulation state
    • Added enableFailureSimulation() method
    • Added disableFailureSimulation() method
    • Added setMaxConsecutiveFailures() method
    • Added _simulateFailure() method
    • Integrated failure simulation in all operations

Created Files

  1. ✅ tests/stellar-network-failures.test.js (520+ lines)

    • 28 comprehensive failure scenario tests
    • All 10 failure types covered
    • Real-world patterns tested

  2. ✅ tests/stellar-retry-logic.test.js (450+ lines)

    • 22 retry logic tests
    • Transient vs permanent error handling
    • Concurrent retry scenarios

  3. ✅ docs/STELLAR_FAILURE_SIMULATION.md

    • Complete usage guide
    • Code examples
    • Best practices
    • Integration guide

  4. ✅ STELLAR_FAILURE_SIMULATION_IMPLEMENTATION.md (this file)

    • Implementation summary
    • Acceptance criteria verification
    • Usage examples

Testing the Implementation

Run All Tests

npm test

Run Failure Simulation Tests Only

npm test tests/stellar-network-failures.test.js
npm test tests/stellar-retry-logic.test.js

Run with Coverage

npm run test:coverage

Verification Checklist

  • ✅ MockStellarService enhanced with failure simulation
  • ✅ 10 different failure types implemented
  • ✅ Configurable failure probability
  • ✅ Auto-recovery mechanism
  • ✅ 28 failure scenario tests created
  • ✅ 22 retry logic tests created
  • ✅ All tests passing
  • ✅ Error messages include retry guidance
  • ✅ State integrity preserved on failures
  • ✅ Concurrent operations handled correctly
  • ✅ Documentation created
  • ✅ Usage examples provided
  • ✅ Integration guide included

Real-World Scenarios Tested

1. Network Congestion

stellarService.enableFailureSimulation('tx_failed', 0.7);
// 70% of transactions fail due to congestion

2. Service Degradation and Recovery

// Phase 1: 80% failure
stellarService.enableFailureSimulation('service_unavailable', 0.8);

// Phase 2: 20% failure (recovery)
stellarService.enableFailureSimulation('service_unavailable', 0.2);

// Phase 3: Full recovery
stellarService.disableFailureSimulation();

3. Intermittent Timeouts

stellarService.enableFailureSimulation('timeout', 0.5);
// 50% of requests timeout

4. Rate Limiting

stellarService.enableFailureSimulation('rate_limit_horizon', 1.0);
// All requests hit rate limit

Integration with Existing Code

The failure simulation integrates seamlessly:

// Existing test
test('should send donation', async () => {
  const result = await stellarService.sendDonation({...});
  expect(result.transactionId).toBeDefined();
});

// Enhanced with failure simulation
test('should handle failures during donation', async () => {
  stellarService.enableFailureSimulation('timeout', 0.3);
  stellarService.setMaxConsecutiveFailures(2);
  
  const result = await stellarService.sendDonation({...});
  expect(result.transactionId).toBeDefined();
});

Performance Impact

  • ✅ No performance impact when disabled
  • ✅ Minimal overhead when enabled
  • ✅ Configurable failure rates
  • ✅ Fast test execution
  • ✅ Suitable for CI/CD pipelines

Future Enhancements

Short Term

  • Add network latency simulation
  • Support custom error messages
  • Add failure metrics collection

Medium Term

  • Failure injection at specific points
  • Failure patterns (every Nth request)
  • Conditional failures by operation type

Long Term

  • Network partition simulation
  • Byzantine failure simulation
  • Failure replay from logs

Related Documentation

Summary

This implementation provides a complete, production-ready Stellar network failure simulation system that:

  1. ✅ Covers all failure scenarios with 10 different failure types
  2. ✅ Exercises retry logic with 22 dedicated retry tests
  3. ✅ Validates state integrity after failures
  4. ✅ Tests concurrent operations under failure conditions
  5. ✅ Provides clear error messages with retry guidance
  6. ✅ Includes comprehensive documentation with examples
  7. ✅ Integrates seamlessly with existing tests

The system enables thorough testing of error handling, retry mechanisms, and failure recovery without requiring actual network failures or Stellar testnet issues.

Acceptance Criteria Verification

✅ Failure scenarios are covered

  • 10 failure types implemented
  • 28 failure scenario tests
  • Intermittent and persistent failures
  • Real-world patterns tested
  • All operations covered (balance, funding, donations, payments)

✅ Retry logic is exercised

  • 22 retry logic tests
  • Transient error retries tested
  • Permanent error no-retry verified
  • Retry exhaustion scenarios
  • Concurrent retry handling
  • State management during retries
  • Performance under retries

Task Complete! 🎉

All acceptance criteria met with comprehensive implementation, extensive testing, and detailed documentation.