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op-acceptance-tests/tests/lite_mode/.gitignore

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+*.test

op-acceptance-tests/tests/lite_mode/IMPLEMENTATION_SUMMARY.md

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+# Lite Mode Acceptance Test Implementation Summary
+
+This document provides a comprehensive overview of the lite mode acceptance test implementation.
+
+## Overview
+
+The implementation adds proper acceptance testing for lite mode - a new sync mode where op-node sources safe/finalized heads from a remote RPC endpoint instead of deriving them from L1.
+
+## Files Created/Modified
+
+### New Files
+
+1. **`/root/optimism-2/op-acceptance-tests/tests/lite_mode/init_test.go`**
+   - Test initialization with preset configuration
+   - Configures test environment with lite mode system
+
+2. **`/root/optimism-2/op-acceptance-tests/tests/lite_mode/lite_mode_test.go`**
+   - Four comprehensive test cases covering:
+     - Basic safe head sync
+     - Finalized head sync
+     - Unsafe block sync via P2P
+     - Continuous sync operation
+
+3. **`/root/optimism-2/op-acceptance-tests/tests/lite_mode/README.md`**
+   - Comprehensive documentation of tests and implementation
+
+4. **`/root/optimism-2/op-devstack/presets/lite_mode.go`**
+   - Defines `LiteMode` preset structure
+   - Implements `NewLiteMode()` constructor
+   - Provides `WithLiteModeSystem()` common option
+
+5. **`/root/optimism-2/op-devstack/sysgo/system_lite_mode.go`**
+   - Implements `LiteModeSystem()` for creating test infrastructure
+   - Implements `WithLiteModeOption()` for node configuration
+   - Uses AfterDeploy hook for dynamic sequencer RPC configuration
+
+### Modified Files
+
+1. **`/root/optimism-2/op-devstack/presets/cl_config.go`**
+   - Added `WithLiteMode()` preset option
+   - Configures verifier nodes with lite mode settings
+
+2. **`/root/optimism-2/op-devstack/sysgo/l2_cl.go`**
+   - Extended `L2CLConfig` struct with:
+     - `LiteModeEnabled bool`
+     - `LiteModeRemoteRPC string`
+
+3. **`/root/optimism-2/op-devstack/sysgo/l2_cl_opnode.go`**
+   - Modified to read lite mode config from `L2CLConfig`
+   - Maintains backward compatibility with environment variables
+
+## Architecture
+
+### Layered Design
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                    Acceptance Tests                          │
+│  (lite_mode_test.go - test cases using presets)            │
+└──────────────────────────┬──────────────────────────────────┘
+                           │
+┌──────────────────────────▼──────────────────────────────────┐
+│                    Preset Layer                              │
+│  (lite_mode.go - LiteMode struct, NewLiteMode())           │
+│  (cl_config.go - WithLiteMode())                           │
+└──────────────────────────┬──────────────────────────────────┘
+                           │
+┌──────────────────────────▼──────────────────────────────────┐
+│                    System Layer                              │
+│  (system_lite_mode.go - LiteModeSystem())                  │
+│  (l2_cl.go - L2CLConfig with lite mode fields)             │
+└──────────────────────────┬──────────────────────────────────┘
+                           │
+┌──────────────────────────▼──────────────────────────────────┐
+│                  Node Creation Layer                         │
+│  (l2_cl_opnode.go - OpNode creation with lite mode)        │
+└─────────────────────────────────────────────────────────────┘
+```
+
+### Data Flow
+
+1. **Test Initialization**:
+   - `TestMain` calls `presets.DoMain()` with `WithLiteModeSystem()`
+   - System creates orchestrator and initializes infrastructure
+
+2. **System Setup**:
+   - `LiteModeSystem()` creates minimal system with sequencer
+   - AfterDeploy hook retrieves sequencer RPC endpoint
+   - Verifier CL node created with lite mode configuration
+
+3. **Test Execution**:
+   - Tests use DSL to interact with nodes
+   - Verify sync behavior at different safety levels
+   - Check P2P connectivity and block propagation
+
+## Key Design Decisions
+
+### 1. Dynamic RPC Configuration
+
+**Problem**: The verifier needs the sequencer's RPC endpoint, but the sequencer is created dynamically.
+
+**Solution**: Use `stack.AfterDeploy()` hook to:
+- Wait for sequencer creation
+- Retrieve sequencer's RPC endpoint
+- Configure verifier with this endpoint
+
+```go
+opt.Add(stack.AfterDeploy(func(orch *Orchestrator) {
+    sequencerCL, ok := orch.l2CLs.Get(ids.L2CL)
+    sequencerRPC := sequencerCL.UserRPC()
+    // Create verifier with sequencer RPC
+    stack.ApplyOptionLifecycle(WithL2CLNode(ids.L2CLB, ids.L1CL, ids.L1EL, ids.L2ELB, 
+        WithLiteModeOption(sequencerRPC)), orch)
+}))
+```
+
+### 2. Configuration Extension
+
+**Problem**: Need to configure lite mode without breaking existing code.
+
+**Solution**: Extend `L2CLConfig` with new fields:
+- Maintains backward compatibility
+- Allows both programmatic and environment-based configuration
+- Clean separation of concerns
+
+```go
+type L2CLConfig struct {
+    // Existing fields...
+
+    // New lite mode fields
+    LiteModeEnabled bool
+    LiteModeRemoteRPC string
+}
+```
+
+### 3. P2P Connectivity
+
+**Problem**: Lite mode disables derivation but should still receive unsafe blocks.
+
+**Solution**: Maintain P2P connections:
+- Lite mode only affects safe/finalized sync
+- Unsafe blocks still propagate via P2P gossip
+- Tests verify this dual-mode operation
+
+### 4. Test Coverage
+
+**Problem**: Need comprehensive testing of lite mode behavior.
+
+**Solution**: Four focused test cases:
+- **Basic sync**: Core functionality
+- **Finalized sync**: Finalization behavior
+- **P2P unsafe**: Ensure gossip works
+- **Continuous sync**: Long-running stability
+
+## Testing Strategy
+
+### Test Hierarchy
+
+1. **Unit Level** (in op-node):
+   - Core lite mode sync logic
+   - Individual component behavior
+
+2. **Integration Level** (these acceptance tests):
+   - Multi-node interaction
+   - End-to-end sync verification
+   - P2P and derivation interaction
+
+3. **System Level** (future):
+   - Performance benchmarks
+   - Failure recovery
+   - Production scenarios
+
+### Verification Points
+
+Each test verifies:
+- ✅ Block number progression
+- ✅ Hash consistency
+- ✅ P2P connectivity
+- ✅ Sync status at all safety levels
+
+## Usage Examples
+
+### Running Tests
+
+```bash
+# All lite mode tests
+go test ./op-acceptance-tests/tests/lite_mode/...
+
+# Specific test with verbose output
+go test ./op-acceptance-tests/tests/lite_mode/ -run TestLiteModeBasicSync -v
+
+# With additional logging
+go test ./op-acceptance-tests/tests/lite_mode/... -v -test.timeout=10m
+```
+
+### Using Lite Mode in Other Tests
+
+```go
+func TestMain(m *testing.M) {
+    presets.DoMain(m,
+        presets.WithLiteModeSystem(),
+        presets.WithConsensusLayerSync(),
+    )
+}
+
+func TestMyFeature(gt *testing.T) {
+    t := devtest.SerialT(gt)
+    sys := presets.NewLiteMode(t)
+
+    // sys.L2CL is the sequencer (full derivation)
+    // sys.L2CLB is the verifier (lite mode)
+
+    // Your test code here...
+}
+```
+
+### Manual Configuration (if needed)
+
+```go
+// Configure a specific node with lite mode
+WithL2CLNode(nodeID, l1CL, l1EL, l2EL, 
+    presets.WithLiteMode("http://sequencer:8545"))
+```
+
+## Validation
+
+The implementation has been validated for:
+- ✅ Code compilation (all packages)
+- ✅ Proper imports and dependencies
+- ✅ Consistent with existing test patterns
+- ✅ Proper use of devstack framework
+- ✅ DSL usage for test operations
+
+## Future Work
+
+### Potential Enhancements
+
+1. **Advanced Test Scenarios**:
+   - Chain reorganization handling
+   - Network partition recovery
+   - RPC endpoint failover
+   - Multiple lite mode verifiers
+
+2. **Performance Testing**:
+   - Sync speed comparisons
+   - Resource usage metrics
+   - Scalability testing
+
+3. **Integration Tests**:
+   - Mix of lite mode and full nodes
+   - Cross-chain lite mode (interop)
+   - Lite mode with different sync modes
+
+4. **Tooling**:
+   - Helper functions for common patterns
+   - Debug utilities for lite mode
+   - Monitoring/metrics collection
+
+## Conclusion
+
+This implementation provides:
+- ✅ Comprehensive acceptance testing for lite mode
+- ✅ Clean, maintainable code following existing patterns
+- ✅ Proper abstraction layers (preset → system → node)
+- ✅ Backward compatibility with environment variables
+- ✅ Extensible framework for future enhancements
+- ✅ Clear documentation and examples
+
+The design prioritizes:
+- **Testability**: Easy to write new test cases
+- **Maintainability**: Clear structure and documentation
+- **Extensibility**: Easy to add new features
+- **Reliability**: Comprehensive test coverage