Running port-binding applications (Jupyter, http.server, NextJS) inside
sandboxes caused severe PTY sluggishness and proxy navigation errors.
Root cause: the CP sandbox proxy and Connect RPC pool shared a single
HTTP transport. Heavy proxy traffic (Jupyter WebSocket, REST polling)
interfered with PTY RPC streams via HTTP/2 flow control contention.
Transport isolation (main fix):
- Add dedicated proxy transport on CP (NewProxyTransport) with HTTP/2
disabled, separate from the RPC pool transport
- Add dedicated proxy transport on host agent, replacing
http.DefaultTransport
- Add dedicated envdclient transport with tuned connection pooling
- Replace http.DefaultClient in file streaming RPCs with per-sandbox
envd client
Proxy path rewriting (navigation fix):
- Add ModifyResponse to rewrite Location headers with /proxy/{id}/{port}
prefix, handling both root-relative and absolute-URL redirects
- Strip prefix back out in CP subdomain proxy for correct browser
behavior
- Replace path.Join with string concat in CP Director to preserve
trailing slashes (prevents redirect loops on directory listings)
Proxy resilience:
- Add dial retry with linear backoff (3 attempts) to handle socat
startup delay when ports are first detected
- Cache ReverseProxy instances per sandbox+port+host in sync.Map
- Add EvictProxy callback wired into sandbox Manager.Destroy
Buffer and server hardening:
- Increase PTY and exec stream channel buffers from 16 to 256
- Add ReadHeaderTimeout (10s) and IdleTimeout (620s) to host agent
HTTP server
Network tuning:
- Set TAP device TxQueueLen to 5000 (up from default 1000)
- Add Firecracker tx_rate_limiter (200 MB/s sustained, 100 MB burst)
to prevent guest traffic from saturating the TAP
Notify users via email when their account is permanently deleted after
the 15-day soft-delete grace period. Query now returns email alongside
user ID so the notification can be sent after deletion.
Email failure is logged as a warning but does not block cleanup.
Replace repetitive actorFields + write boilerplate across all 25+ typed
Log methods with shared helpers: newEntry (general), newAdminEntry
(platform-level), resolveHostTeamID, and logSystemHostEvent.
Reduces logger.go from 665 to 374 lines with no behavior change.
Log every admin-panel action (user activate/deactivate, team BYOC toggle,
team delete, template delete, build create/cancel) to the audit_logs table
under PlatformTeamID with scope "admin".
Add GET /v1/admin/audit-logs endpoint and /admin/audit frontend page with
infinite scroll and hierarchical filters. Expose audit.Entry + Log() for
cloud repo extensibility.
Fix seed_platform_team down-migration FK violation by deleting dependent
rows before the team row.
Anonymize audit logs when soft-deleted users are purged after 15 days:
actor_name set to 'deleted-user', actor_id and resource_id nulled,
email stripped from member metadata. Per-user delete ensures no user
is removed without successful anonymization.
Frontend renders deleted-user as a styled red badge in audit log view.
Fix shared host create/delete audit logs landing in admin's personal
team — now correctly assigned to PlatformTeamID.
Introduce pre-computed daily usage rollups from sandbox_metrics_snapshots.
An hourly background worker aggregates completed days, while today's
usage is computed live from snapshots at query time for freshness.
Backend: new daily_usage table, rollup worker, UsageService, and
GET /v1/capsules/usage endpoint with date range filtering (up to 92 days).
Frontend: replace Usage page placeholder with bar charts (Chart.js),
summary total cards, and preset/custom date range controls.
Extracts Mailer interface, EmailData, and Button to pkg/email/types.go
so the cloud repo can use them via ServerContext. internal/email re-exports
the types as aliases so existing callers are unchanged. Also fixes
pre-existing lint errors (unchecked rollback and deadline calls).
