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>
Extend the config, database schema, and server internals to support
per-route L4/L7 mode selection and PROXY protocol fields. This is the
foundation for L7 HTTP/2 reverse proxying and multi-hop PROXY protocol
support described in the updated ARCHITECTURE.md.
Config: Listener gains ProxyProtocol; Route gains Mode, TLSCert,
TLSKey, BackendTLS, SendProxyProtocol. L7 routes validated at load
time (cert/key pair must exist and parse). Mode defaults to "l4".
DB: Migration v2 adds columns to listeners and routes tables. CRUD
and seeding updated to persist all new fields.
Server: RouteInfo replaces bare backend string in route lookup.
handleConn dispatches on route.Mode (L7 path stubbed with error).
ListenerState and ListenerData carry ProxyProtocol flag.
All existing L4 tests pass unchanged. New tests cover migration v2,
L7 field persistence, config validation for mode/cert/key, and
proxy_protocol flag round-tripping.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Database (internal/db) stores listeners, routes, and firewall rules with
WAL mode, foreign keys, and idempotent migrations. First run seeds from
TOML config; subsequent runs load from DB as source of truth.
gRPC admin API now writes to the database before updating in-memory state
(write-through cache pattern). Adds snapshot command for VACUUM INTO
backups. Refactors firewall.New to accept raw rule slices instead of
config struct for flexibility.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
