# Session Handoff - Phase 8.1 TLS Support

**Session**: 2026-01-13
**Completed**: Phases 7.3-7.6 ✅ + Phase 8 Planning ✅ + Phase 8.1 Foundation ✅
**Status**: Ready for next session to continue TLS implementation

---

## What Was Accomplished This Session

### Phases 7.3-7.6 Completion ✅

All Phase 7 stabilization phases completed:

1. **Phase 7.3: Real-World Testing** - Load/stress tests, TESTING_GUIDE.md
2. **Phase 7.4: Error Messages** - TROUBLESHOOTING.md (1400+ lines), error helpers
3. **Phase 7.5: CI/CD** - GitHub Actions, Docker multi-platform, release automation
4. **Phase 7.6: Documentation** - 5 example programs, QUICK_START.md, README/CONTRIBUTING updates

**Total for Phase 7**: 8,000+ lines of documentation, 2,500+ lines of test code

### Phase 8 Launch ✅

**Phase 8 Planning Documents Created**:

- `PHASE_8_PLAN.md` (577 lines) - Feature priority matrix, specs for 6 features
- `.phases/phase-8-1-tls-support.md` (400+ lines) - Detailed TLS implementation plan

**Feature Priority Established**:

1. TLS Support (🔴 Critical) - In Progress
2. Connection Configuration (🟢 High) - Planned
3. Query Metrics (🟢 High) - Planned
4. Typed Streaming (🟡 Medium) - Deferred
5. SCRAM Auth (🟡 Medium) - Deferred
6. Connection Pooling (High effort) - Separate crate

### Phase 8.1 TLS Foundation ✅

**Current State**:

- ✅ Dependencies added to Cargo.toml (rustls, rustls-pemfile, webpki, webpki-roots)
- ✅ `src/connection/tls.rs` module created (380+ lines)
  - TlsConfig struct with full documentation
  - TlsConfigBuilder with fluent API
  - Certificate loading (custom CA or system roots)
  - Server name parsing for SNI
  - Unit test framework
- ✅ Module exported from `src/connection/mod.rs`
- 🔧 **In Progress**: Fixing rustls 0.21 API for ClientConfig builder

---

## Current Blockers & Next Steps

### Immediate Next Action

**Complete TLS Module Compilation** (Priority 1)

The TLS module needs the rustls ClientConfig builder to be completed with `with_webpki_verifier`.

**File**: `src/connection/tls.rs` lines 265-270

**Issue**: The rustls 0.21 API requires:

```rust
ClientConfig::builder()
    .with_safe_default_cipher_suites()
    .with_safe_default_kx_groups()
    .with_protocol_versions(&[&rustls::version::TLS13])
    .with_webpki_verifier(
        Arc::new(WebpkiServerVerifier::new(root_store, None))
    )
    .with_no_client_auth()
```

**Required imports**:

```rust
use rustls::crypto::ring::default_provider;
use rustls_webpki::WebpkiServerVerifier;
use std::sync::Arc;
```

### Phase 8.1 Remaining Tasks

1. **8.1.1 Fix TLS Compilation** (1-2 hours)
   - Complete ClientConfig builder chain
   - Verify types compile
   - Run `cargo check` and `cargo test`

2. **8.1.2 Integrate with Transport** (2-3 hours)
   - Modify `src/connection/transport.rs` to support TLS
   - Add TlsStream wrapper for TCP connections
   - Implement TLS handshake

3. **8.1.3 Add FraiseClient::connect_tls()** (1-2 hours)
   - Create new method in `src/client/mod.rs`
   - Accept TlsConfig parameter
   - Parse hostname for SNI

4. **8.1.4 Comprehensive Tests** (2-3 hours)
   - Unit tests for TlsConfig
   - Integration tests with real TLS (optional self-signed certs)
   - Error case tests

5. **8.1.5 Example Program** (1-2 hours)
   - Create `examples/tls.rs`
   - Demonstrate production TLS setup
   - Show development mode with self-signed certs

**Total remaining for 8.1**: ~9-13 hours of work

### Phase 8.2 Planning

After TLS is complete, proceed to:

**Phase 8.3: Connection Configuration** (Quick win - ~3-5 days)

- `ConnectionConfig` builder
- Timeout settings (connect_timeout, statement_timeout)
- Keepalive options
- Application name setting

**Phase 8.5: Query Metrics** (~1 week)

- Collect per-query metrics
- Expose row count, bytes, duration, throughput
- Integrate with tracing

---

## Code State

### Files Modified/Created This Session

✅ **Documentation**:

- ROADMAP.md - Updated Phase 7 status
- PHASE_8_PLAN.md - New (577 lines)
- .phases/phase-8-1-tls-support.md - New (400+ lines)

✅ **Code**:

- Cargo.toml - Added TLS dependencies
- src/connection/tls.rs - New (380+ lines, needs API fixes)
- src/connection/mod.rs - Updated exports

### Git History

```
edd11bc feat(phase-8.1): Begin TLS Support implementation
c4646e7 docs(phase-8): Create comprehensive Phase 8 feature expansion plan
6b1164b docs: Mark Phase 7 complete, update Phase 8 with priority features
8bba2bf docs(phase-7.6): Complete Documentation Polish with examples and guides
eb8da52 feat(phase-7.5): Implement CI/CD Improvements
```

### Test Status

- `cargo check` fails due to incomplete rustls API usage
- `cargo test` not run yet (depends on cargo check)
- Tests to write: TLS unit tests, integration tests, example programs

---

## Session Summary

### 📊 Metrics

| Aspect | Result |
|--------|--------|
| Phases Completed | 7.3-7.6 (all Phase 7) ✅ |
| Feature Expansion Planning | Complete ✅ |
| TLS Module Foundation | 380+ lines created ✅ |
| Dependencies Added | 4 (rustls ecosystem) ✅ |
| Documentation Created | 1000+ lines ✅ |
| Code Ready to Ship | TLS needs API fixes ⏳ |

### 🎯 Key Accomplishments

1. **Stabilization Complete**: v0.1.0 now production-hardened
2. **Clear Roadmap**: Feature priority and implementation strategy set
3. **Strong Foundation**: TLS module design and structure in place
4. **Next Action Identified**: Clear next steps for next session

### ✨ Quality Metrics

- Zero clippy warnings (once TLS compiles)
- Comprehensive rustdoc (in progress)
- > 90% test coverage target (to be verified)
- Backward compatible with v0.1.0

---

## Tips for Next Session

1. **Start with TLS compilation fix**
   - Search for `with_webpki_verifier` in rustls 0.21 examples
   - Likely need: `rustls::crypto::ring::default_provider()`
   - Reference: <https://docs.rs/rustls/latest/rustls/>

2. **Testing strategy**
   - Create self-signed cert for testing (OpenSSL)
   - Add `#[ignore]` to TLS tests requiring certs
   - CI tests with Postgres TLS in docker-compose

3. **Review files before editing**
   - `src/connection/tls.rs` - needs API fix
   - `src/connection/transport.rs` - needs TLS integration
   - `src/client/mod.rs` - needs connect_tls() method

4. **Branch strategy** (optional)
   - Consider feature branch: `git checkout -b feat/tls-support`
   - Easier to track changes, merge when ready

---

## Versioning Strategy (CRITICAL UPDATE)

**IMPORTANT DECISION**: Stay at v0.1.0 with optional feature additions in patch releases.

Instead of v0.2.0, implement features as:

- **v0.1.1**: TLS Support + Connection Configuration (2-3 weeks)
- **v0.1.2**: Query Metrics (1-2 weeks)
- **v0.1.3+**: Typed Streaming, SCRAM Auth (if requested)

Each feature is **optional and backward compatible**. Users can upgrade to any patch version without adopting new features.

**Benefits**:

- Maintains strict semantic versioning (no breaking changes)
- Each feature independently adoptable
- Clearer upgrade path for users
- Simpler release management

---

## Context for Next Session

**Project**: fraiseql-wire - Streaming JSON query engine for Postgres 17
**Current Version**: v0.1.0 (MVP complete)
**Release Strategy**: v0.1.x patch releases for feature additions
**Status**: Phase 8 Feature Expansion underway (TLS next)

**Key Files**:

- `/home/lionel/code/fraiseql-wire/.phases/phase-8-1-tls-support.md` - Detailed plan
- `/home/lionel/code/fraiseql-wire/PHASE_8_PLAN.md` - Feature matrix
- `/home/lionel/code/fraiseql-wire/src/connection/tls.rs` - Main module
- `/home/lionel/code/fraiseql-wire/Cargo.toml` - Dependencies

**Contact/Resources**:

- GitHub: <https://github.com/fraiseql/fraiseql-wire>
- Docs: <https://docs.rs/fraiseql-wire>
- Crates.io: <https://crates.io/crates/fraiseql-wire>

---

**Ready for next session! All context preserved in documentation. 🚀**
