Kyle Isom
564e0a9c67
Configurable maximum concurrent connections per listener. When the limit is reached, new connections are closed immediately after accept. 0 means unlimited (default, preserving existing behavior). Config: Listener gains max_connections field, validated non-negative. DB: Migration 3 adds listeners.max_connections column. UpdateListenerMaxConns method for runtime changes via gRPC. CreateListener updated to persist max_connections on seed. Server: ListenerState/ListenerData gain MaxConnections. Limit checked in serve() after Accept but before handleConn — if ActiveConnections >= MaxConnections, connection is closed and the accept loop continues. SetMaxConnections method for runtime updates. Proto: SetListenerMaxConnections RPC added. ListenerStatus gains max_connections field. Generated code regenerated. gRPC server: SetListenerMaxConnections implements write-through (DB first, then in-memory update). GetStatus includes max_connections. Client: SetListenerMaxConnections method, MaxConnections in ListenerStatus. Tests: DB CRUD and UpdateListenerMaxConns, server connection limit enforcement (accept 2, reject 3rd, close one, accept again), gRPC SetListenerMaxConnections round-trip with DB persistence, not-found error handling. Also updates PROJECT_PLAN.md with phases 6-8 and PROGRESS.md with tracking for the new features. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
91 lines
4.1 KiB
Markdown
91 lines
4.1 KiB
Markdown
# PROGRESS.md
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Tracks implementation status against PROJECT_PLAN.md. Updated as work
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proceeds. Each item is marked:
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- `[ ]` not started
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- `[~]` in progress
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- `[x]` complete
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- `[—]` skipped (with reason)
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---
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## Phase 1: Database & Config Foundation
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- [x] 1.1 Config struct updates (`Listener.ProxyProtocol`, `Route.Mode/TLSCert/TLSKey/BackendTLS/SendProxyProtocol`)
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- [x] 1.2 Config validation updates (L7 requires cert/key, mode enum, cert/key pair loading)
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- [x] 1.3 Database migration v2 (new columns on `listeners` and `routes`)
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- [x] 1.4 DB struct and CRUD updates (new fields in `Listener`, `Route`, all queries)
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- [x] 1.5 Server data loading (`RouteInfo` struct replaces bare backend string in route lookup)
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- [x] 1.6 Tests (config, DB migration, CRUD, server unchanged)
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## Phase 2: PROXY Protocol
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- [x] 2.1 `internal/proxyproto/` package (v1/v2 parser, v2 writer)
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- [x] 2.2 Server integration — receive (parse PROXY header before firewall on enabled listeners)
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- [x] 2.3 Server integration — send on L4 (write PROXY v2 header before ClientHello on enabled routes)
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- [x] 2.4 Tests (receive, send, firewall uses real IP, malformed header rejection)
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## Phase 3: L7 Proxying
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- [x] 3.1 `internal/l7/` package (`PrefixConn`, HTTP/2 reverse proxy with h2c, `Serve` entry point)
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- [x] 3.2 Server integration (dispatch to L4 or L7 based on `route.Mode` in `handleConn`)
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- [x] 3.3 PROXY protocol sending in L7 path
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- [x] 3.4 Tests (TLS termination, h2c backend, re-encrypt, mixed L4/L7 listener, gRPC through L7)
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## Phase 4: gRPC API & CLI Updates
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- [x] 4.1 Proto updates (new fields on `Route`, `AddRouteRequest`, `ListenerStatus`)
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- [x] 4.2 gRPC server updates (accept/validate/persist new route fields)
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- [x] 4.3 Client package updates (new fields on `Route`, `ListenerStatus`)
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- [x] 4.4 mcproxyctl updates (flags for `routes add`, display in `routes list`)
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- [x] 4.5 Tests (gRPC round-trip with new fields, backward compatibility)
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## Phase 5: Integration & Polish
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- [x] 5.1 Dev config update (`srv/mc-proxy.toml` with L7 route example)
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- [x] 5.2 Multi-hop integration test (edge→origin via PROXY protocol)
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- [x] 5.3 gRPC-through-L7 validation (trailer propagation, large responses)
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- [x] 5.4 Web UI through L7 validation (HTTP/1.1 fallback, HTTP/2)
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- [x] 5.5 Documentation (verified ARCHITECTURE.md, CLAUDE.md, Makefile)
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## Phase 6: Per-Listener Connection Limits
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- [x] 6.1 Config: `MaxConnections` on Listener, validation
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- [x] 6.2 DB: migration 3, CRUD updates, `UpdateListenerMaxConns`
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- [x] 6.3 Server: limit enforcement in `serve()`, `SetMaxConnections` method
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- [x] 6.4 Proto/gRPC: `SetListenerMaxConnections` RPC, `max_connections` in status
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- [x] 6.5 Client: `SetListenerMaxConnections` method, `MaxConnections` in status
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- [x] 6.6 Tests: DB CRUD, server limit enforcement, gRPC round-trip
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## Phase 7: L7 Policies
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- [ ] 7.1 Config: `L7Policy` struct, `L7Policies` on Route, validation
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- [ ] 7.2 DB: migration 4, `l7_policies` table, CRUD in `l7policies.go`
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- [ ] 7.3 L7 middleware: `PolicyMiddleware` in `internal/l7/policy.go`
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- [ ] 7.4 Server/L7 integration: thread policies from RouteInfo to RouteConfig
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- [ ] 7.5 Proto/gRPC: `L7Policy` message, policy management RPCs
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- [ ] 7.6 Client/CLI: policy methods, `mcproxyctl policies` subcommand
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- [ ] 7.7 Startup: load L7 policies per route in `loadListenersFromDB`
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- [ ] 7.8 Tests: middleware unit, DB CRUD + cascade, gRPC round-trip, e2e
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## Phase 8: Prometheus Metrics
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- [ ] 8.1 Dependency: add `prometheus/client_golang`
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- [ ] 8.2 Config: `Metrics` section (`addr`, `path`)
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- [ ] 8.3 Package: `internal/metrics/` definitions and HTTP server
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- [ ] 8.4 Instrumentation: connections, firewall, dial latency, bytes, HTTP status, policy blocks
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- [ ] 8.5 Firewall: `BlockedWithReason()` method
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- [ ] 8.6 L7: status recording on ResponseWriter
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- [ ] 8.7 Startup: conditionally start metrics server
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- [ ] 8.8 Tests: metric sanity, server endpoint, `BlockedWithReason`
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---
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## Current State
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Phases 1-6 complete. Per-listener connection limits are implemented and
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tested. L7 policies and Prometheus metrics are next.
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`go vet` and `go test` pass across all 13 packages.
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