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Middle-End protocol hardening

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- Secure framing / hot-path fix: enforced a single length + padding contract across the framing layer. Replaced legacy runtime `len % 4` recovery with strict validation to eliminate undefined behavior paths.

- ME RPC aligned with C reference contract: handshake now includes `flags + sender_pid + peer_pid`. Added negotiated CRC mode (CRC32 / CRC32C) and applied the negotiated mode consistently in read/write paths.

- Sequence fail-fast semantics: immediate connection termination on first sequence mismatch with dedicated counter increment.

- Keepalive reworked to RPC ping/pong: removed raw CBC keepalive frames. Introduced stale ping tracker with proper timeout accounting.

- Route/backpressure observability improvements: increased per-connection route queue to 4096. Added `RouteResult` with explicit failure reasons (NoConn, ChannelClosed, QueueFull) and per-reason counters.

- Direct-DC secure mode-gate relaxation: removed TLS/secure conflict in Direct-DC handshake path.
This commit is contained in:
Alexey
2026-02-23 02:28:00 +03:00
parent 69be44b2b6
commit 6ff29e43d3
16 changed files with 407 additions and 137 deletions
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32
src/metrics.rs
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@@ -100,6 +100,14 @@ fn render_metrics(stats: &Stats) -> String {
let _ = writeln!(out, "# TYPE telemt_me_keepalive_failed_total counter");
let _ = writeln!(out, "telemt_me_keepalive_failed_total {}", stats.get_me_keepalive_failed());
let _ = writeln!(out, "# HELP telemt_me_keepalive_pong_total ME keepalive pong replies");
let _ = writeln!(out, "# TYPE telemt_me_keepalive_pong_total counter");
let _ = writeln!(out, "telemt_me_keepalive_pong_total {}", stats.get_me_keepalive_pong());
let _ = writeln!(out, "# HELP telemt_me_keepalive_timeout_total ME keepalive ping timeouts");
let _ = writeln!(out, "# TYPE telemt_me_keepalive_timeout_total counter");
let _ = writeln!(out, "telemt_me_keepalive_timeout_total {}", stats.get_me_keepalive_timeout());
let _ = writeln!(out, "# HELP telemt_me_reconnect_attempts_total ME reconnect attempts");
let _ = writeln!(out, "# TYPE telemt_me_reconnect_attempts_total counter");
let _ = writeln!(out, "telemt_me_reconnect_attempts_total {}", stats.get_me_reconnect_attempts());
@@ -108,6 +116,30 @@ fn render_metrics(stats: &Stats) -> String {
let _ = writeln!(out, "# TYPE telemt_me_reconnect_success_total counter");
let _ = writeln!(out, "telemt_me_reconnect_success_total {}", stats.get_me_reconnect_success());
let _ = writeln!(out, "# HELP telemt_me_crc_mismatch_total ME CRC mismatches");
let _ = writeln!(out, "# TYPE telemt_me_crc_mismatch_total counter");
let _ = writeln!(out, "telemt_me_crc_mismatch_total {}", stats.get_me_crc_mismatch());
let _ = writeln!(out, "# HELP telemt_me_seq_mismatch_total ME sequence mismatches");
let _ = writeln!(out, "# TYPE telemt_me_seq_mismatch_total counter");
let _ = writeln!(out, "telemt_me_seq_mismatch_total {}", stats.get_me_seq_mismatch());
let _ = writeln!(out, "# HELP telemt_me_route_drop_no_conn_total ME route drops: no conn");
let _ = writeln!(out, "# TYPE telemt_me_route_drop_no_conn_total counter");
let _ = writeln!(out, "telemt_me_route_drop_no_conn_total {}", stats.get_me_route_drop_no_conn());
let _ = writeln!(out, "# HELP telemt_me_route_drop_channel_closed_total ME route drops: channel closed");
let _ = writeln!(out, "# TYPE telemt_me_route_drop_channel_closed_total counter");
let _ = writeln!(out, "telemt_me_route_drop_channel_closed_total {}", stats.get_me_route_drop_channel_closed());
let _ = writeln!(out, "# HELP telemt_me_route_drop_queue_full_total ME route drops: queue full");
let _ = writeln!(out, "# TYPE telemt_me_route_drop_queue_full_total counter");
let _ = writeln!(out, "telemt_me_route_drop_queue_full_total {}", stats.get_me_route_drop_queue_full());
let _ = writeln!(out, "# HELP telemt_secure_padding_invalid_total Invalid secure frame lengths");
let _ = writeln!(out, "# TYPE telemt_secure_padding_invalid_total counter");
let _ = writeln!(out, "telemt_secure_padding_invalid_total {}", stats.get_secure_padding_invalid());
let _ = writeln!(out, "# HELP telemt_user_connections_total Per-user total connections");
let _ = writeln!(out, "# TYPE telemt_user_connections_total counter");
let _ = writeln!(out, "# HELP telemt_user_connections_current Per-user active connections");