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Changelog

Hyper 1.0 Migration - READY FOR TESTING ✅

Summary

Successfully migrated libsql-server from Hyper 0.14 to Hyper 1.0 ecosystem. This is a major upgrade affecting the entire HTTP stack.

Dependency Changes

  • hyper: 0.14 → 1.0
  • http: 0.2 → 1.0
  • http-body: 0.4 → 1.0
  • tonic: 0.11 → 0.12
  • prost: 0.12 → 0.13
  • rustls: 0.21 → 0.23
  • tokio-rustls: 0.24 → 0.26
  • axum: 0.6 → 0.7
  • hyper-util: Added 0.1
  • http-body-util: Added 0.1
  • hyper-tungstenite: 0.13 → 0.19
  • tokio-tungstenite: 0.24 → 0.28

Critical Fixes Applied

1. Build Error Fix - http2_only() API ✅

  • File: libsql-server/src/http/user/mod.rs:473
  • Issue: http2_only(false) - method takes 0 arguments, not 1
  • Fix: Removed the boolean argument
  • Status: ✅ RESOLVED

2. HTTP Version Mismatch Fix ✅

  • File: bindings/c/Cargo.toml:20
  • Issue: Used http = "1.1.0" while workspace uses http = "1.0"
  • Fix: Changed to http = "1.0" for version consistency
  • Status: ✅ RESOLVED

3. TLS Handshake Race Condition Fix ✅

  • File: libsql-server/src/rpc/mod.rs
  • Issue: TlsIncomingStream had race condition where pending handshakes could stall
  • Fix: Rewrote using FuturesUnordered<JoinHandle<...>> for proper concurrent TLS handshake management
  • Status: ✅ RESOLVED

4. HTTP/2 Support for gRPC ✅

  • Files: libsql/src/database.rs, bindings/c/src/lib.rs
  • Issue: gRPC requires HTTP/2, connectors only enabled HTTP/1.1
  • Fix: Added .enable_http2() to hyper-rustls connector builders
  • Status: ✅ RESOLVED

5. CI golang-bindings Port Fix ✅

  • File: .github/workflows/golang-bindings.yml
  • Issue: LIBSQL_PRIMARY_URL used port 8080 (HTTP/Hrana) but embedded replicas need port 5001 (gRPC)
  • Fix: Changed URL from http://127.0.0.1:8080 to http://127.0.0.1:5001
  • Status: ✅ READY FOR TESTING

6. SQLEAN Extensions Build Fix ✅

  • File: libsql-ffi/build.rs
  • Issue: pcre2_internal.h incorrectly included as source file
  • Fix: Removed header from source patterns
  • Status: ✅ RESOLVED

7. Async File I/O Consistency ✅

  • File: libsql-server/src/rpc/mod.rs:73
  • Issue: CA cert reading used blocking std::fs in async context
  • Fix: Changed to tokio::fs::read_to_string
  • Status: ✅ RESOLVED

Comprehensive CI Workflow Analysis

Workflow Risk Assessment

Workflow Risk Level Reason
rust.yml 🔴 HIGH Full test suite, tokio_unstable, compilation + tests
golang-bindings.yml 🔴 HIGH Direct server startup, gRPC on port 5001, HTTP on 8080
libsql-server-release.yml 🟡 MEDIUM Cross-platform builds with tokio_unstable
publish-server.yml 🟡 MEDIUM Docker image builds
server-pr-images.yml 🟡 MEDIUM PR Docker builds
nemesis.yml 🟡 MEDIUM Integration tests with sqld
c-bindings.yml 🟢 LOW Pure compilation, no server runtime
extensions-test.yml 🟢 LOW Extension testing only
brew-test.yml 🟢 LOW CLI installation only
publish-crsqlite.yml 🟢 LOW C extension build
release-drafter.yml 🟢 LOW Release notes only
release-libsql.yml 🟢 LOW C library build
sqlite3.yml 🟢 LOW C/SQLite with Wasm

Port Usage in CI

Port Used By Protocol Purpose
5001 golang-bindings.yml gRPC Embedded replica replication
8080 golang-bindings.yml HTTP/Hrana Health checks, HTTP API

Current CI Status (Expected After Fixes)

Workflow Status Notes
Run Checks ✅ PASS Format, check, clippy - build error fixed
c-bindings ✅ PASS C library build
c-bundle-validate ✅ PASS Bundle up-to-date check
CR SQLite C Tests ✅ PASS CR SQLite tests
CR SQLite Rust Tests ✅ PASS CR SQLite Rust tests
Extensions Tests ✅ PASS SQL extensions
Windows checks ✅ PASS Windows build
golang-bindings 🧪 READY Port 5001 fix applied, needs testing
cargo-udeps ⚠️ LIKELY FAIL False positives for hyper deps

Known Issues

cargo-udeps False Positives

The cargo-udeps check reports unused dependencies for:

  • hyper-rustls - Used in libsql/src/database.rs
  • http-body-util - Used throughout the codebase
  • tower-http - Used in HTTP server

These are false positives due to how the dependencies are used (through re-exports or trait implementations). The --each-feature flag causes these to be flagged incorrectly.

Workaround: These can be ignored or the check can be modified to use --all-features instead.

Security Hardening Applied

Critical Issues Addressed

  1. ✅ TLS handshake race condition fixed (FuturesUnordered rewrite)
  2. ✅ HTTP/2 properly enabled for gRPC
  3. ✅ Build errors resolved
  4. ✅ TLS handshake timeout (30 seconds)
  5. ✅ Concurrent handshake limit (1000 max, with backpressure)
  6. ✅ Async file I/O consistency (CA cert reading now async)

Security Features

  • TLS Handshake Timeout: 30 second timeout prevents slowloris attacks
  • Handshake Limit: Maximum 1000 concurrent TLS handshakes with backpressure
  • Proper Async I/O: All file operations are now non-blocking
  • ALPN Configuration: Proper HTTP/2 and HTTP/1.1 protocol negotiation

Security Review Summary

File Rating Notes
rpc/mod.rs 🟡 NEEDS_IMPROVEMENT Handshake limit added, but no global connection limits
http/user/mod.rs 🟡 NEEDS_IMPROVEMENT No HTTP timeouts configured yet
net.rs 🟢 SECURE Clean abstraction, delegates security
database.rs 🟡 NEEDS_IMPROVEMENT No cert validation control

Future Hardening (Optional)

  1. Add global connection limits (semaphore-based)
  2. Add per-IP rate limiting
  3. Add HTTP request/idle timeouts
  4. Consider strict CA cert parsing instead of add_parsable_certificates
  5. Add metrics for TLS handshake failures/timeouts

Key API Changes

  • hyper::Body → hyper::body::Incoming
  • hyper::Client → hyper_util::client::legacy::Client
  • hyper::Server → hyper_util::server::conn::auto::Builder
  • hyper::body::to_bytes → http_body_util::BodyExt::collect().await?.to_bytes()
  • hyper::rt::Read/Write are new traits distinct from tokio::io::AsyncRead/AsyncWrite

Files Modified (25+ files)

Core Server

  • libsql-server/Cargo.toml - Updated dependencies
  • libsql-server/src/lib.rs - Server struct simplification
  • libsql-server/src/net.rs - HyperStream wrapper for Hyper 1.0 traits
  • libsql-server/src/rpc/mod.rs - Tonic 0.12 migration, TLS stream fixes
  • libsql-server/src/http/admin/mod.rs - Axum 0.7 migration
  • libsql-server/src/http/user/mod.rs - Body type conversions, http2_only fix
  • libsql-server/src/hrana/http/mod.rs - Request body type changes
  • libsql-server/src/hrana/ws/handshake.rs - WebSocketConfig updates
  • libsql-server/src/test/bottomless.rs - S3 mock server updates

Client Libraries

  • libsql/src/database.rs - HTTP/2 connector support
  • libsql/src/sync.rs - Fixed private_interfaces warning
  • libsql/src/hrana/hyper.rs - Removed unused imports

C Bindings

  • bindings/c/Cargo.toml - hyper-rustls 0.25 → 0.27, http 1.1.0 → 1.0
  • bindings/c/src/lib.rs - HTTP/2 connector support

CI/CD

  • .github/workflows/golang-bindings.yml - Port configuration fix (8080 → 5001)

Build System

  • libsql-ffi/build.rs - Fixed SQLEAN extensions build

Integration Tests

  • All integration test files migrated to hyper 1.0

Known Limitations

  • H2C (HTTP/2 Cleartext) upgrade support disabled - uses Hyper 0.14 APIs
  • Admin dump from URL disabled - connector trait complexity
  • 2 bottomless S3 tests ignored - need full S3 protocol mock

Test Results

test result: ok. 99 passed; 0 failed; 3 ignored

Next Steps

  1. Push changes to PR branch (requires workflow scope token)
  2. Monitor golang-bindings CI result
  3. Address cargo-udeps false positives if needed
  4. Final merge preparation

Previous Releases

v0.24.33

  • Original Hyper 0.14 based release