* fix: server startup stampede — timeout model detection, non-fatal PG migrations
detect_model() blocked the main thread for up to 400s when the LLM backend
was unreachable (OpenAI SDK default: 600s read timeout × 2 retries × TCP
retransmit). Cap startup detection at 10s with no retries — the
BackendHealthMonitor handles ongoing availability probing after startup.
PostgreSQL migrations via _run_with_pg_lock() crashed the server on lock
contention when 10 containers stampeded the advisory lock simultaneously.
Wrap in try/except matching the SQLite path — the entrypoint script already
runs migrations before the server process starts.
Health check start_period increased from 15s to 60s to accommodate the
startup sequence under load.
* fix: address review — narrow PG migration except, add detect_model test
Narrow the PG migration except clause to (OSError, EOFError) so DDL
errors still propagate. Add two unit tests for detect_model() verifying
with_options(timeout=10, max_retries=0) is called and that connection
errors in non-fatal mode return (None, None).
* feat: raise scaling limits for 1000-node clusters
Raise hardcoded limits throughout the codebase so clusters up to 1000
nodes work without configuration changes.
Scaling limits:
- max_workstreams default 10 → 50 (configurable via settings)
- Console fan-out concurrency 50 → 200 (configurable: cluster.node_fan_out_limit)
- MCP max servers 50 → 200 (configurable: cluster.mcp_max_servers)
- Console SSE queue 500 → 2000, server global SSE queue 500 → 1000
- httpx proxy pool: explicit max_connections on both proxy clients
- PostgreSQL pool 5+10 → 2+3 per process (right-sized for short-burst queries)
- Redis pool: explicit max_connections=200 on both sync and async brokers
Performance optimizations:
- Redis list_nodes(): replace N+1 SCAN+GET with SCAN+MGET
- Collector poll: raise thread pool to 200 (matches fan-out limit)
- Server SSE: dedicated ThreadPoolExecutor(200) for queue polling
- Fan-out: new get_all_nodes() removes hardcoded limit=1000 ceiling
Bug fixes:
- Settings reload notification was silently failing (called .get() on tuple)
- Watch fan-out only queried 500 nodes instead of full cluster
New cluster settings (configurable via admin Settings tab):
- cluster.node_fan_out_limit (default 200, range 10-1000)
- cluster.mcp_max_servers (default 200, range 1-2000)
Adds docs/pgbouncer.md for PostgreSQL connection pooling at scale.
Adds ddgStressCluster compose profile (100 nodes, 10 groups of 10).
Updates architecture, console, docker, settings, and API reference docs.
* fix: add image tag to compose anchors to avoid redundant builds
All cluster/stress services inherit `build:` from the anchor, causing
Docker to attempt 200+ separate builds. Adding `image: turnstone:local`
means Docker builds once and all services reuse the cached image.
* fix: address Copilot review feedback on scaling PR
- Remove magic number in get_all_nodes (limit=None instead of 2**31)
- Size httpx proxy pool from fan-out limit setting (not hardcoded 250)
- Cap cluster.node_fan_out_limit max_value to 500, mark restart_required
- Convert _publish_config_change from sync to async (was blocking event loop)
- Use shutdown(wait=True, cancel_futures=True) for SSE executor
* fix: add PostgreSQL env vars to cluster bridge anchor
Bridges initialize storage for auth/migrations but the bridge anchor
was missing TURNSTONE_DB_BACKEND and TURNSTONE_DB_URL, causing all
bridges to fall back to SQLite. With 100 bridges sharing the same
volume, concurrent SQLite migrations corrupt the database.
* fix: address Copilot round 2 + PG connection exhaustion at startup
Copilot feedback:
- Raise cluster.node_fan_out_limit max_value to 1000 (matches target)
- Cache fan-out limit on app.state at startup instead of re-reading DB
per request (pool and semaphore now use the same value consistently)
- Remove unused params from _publish_config_change
Stress cluster fix:
- Raise PG max_connections to 300 (configurable via POSTGRES_MAX_CONNECTIONS)
to handle 200 processes connecting simultaneously at startup
- Bump PG shared_buffers to 128MB and memory limit to 1G to match
- Add DB env vars to production bridge service
* fix readme
* fix: startup resilience for large clusters
Server no longer crashes when LLM backend is unreachable at startup.
detect_model() accepts fatal=False, returning (None, None) so the
server starts in degraded mode with circuit breaker open. The health
monitor will detect when the backend becomes available.
Migration runner retries with jittered exponential backoff (up to 10
attempts) when PostgreSQL rejects connections during startup stampedes.
Collector httpx pool sized to match poll workers (was using default of
100 connections with 200 workers).
Also addresses Copilot round 2:
- Raise cluster.node_fan_out_limit max_value to 1000
- Cache fan-out limit on app.state at startup
- Remove unused params from _publish_config_change
- Add DB env vars to production bridge service
* fix: replace silent error suppression with structured logging
Audit and fix 30+ instances of silently swallowed exceptions across 8
files. No-raise contracts are preserved — all changes add logging
while keeping the same return-value behavior.
memory.py (26 changes):
Every storage operation now logs on failure. Previously the entire
persistence facade had zero logging — messages, workstream state,
and structured memories could silently stop being saved.
server.py:
Usage recording failures now log at warning (was pass).
Global SSE fan-out errors log at debug (was pass).
console/server.py:
Config reload notification logs per-node failures at warning.
Settings read fallbacks log at warning with the default value used.
auth.py:
User existence check logs at warning (was pass).
Setup rollback failures log at error (was suppress).
OIDC state cleanup logs at debug (was suppress).
mcp_client.py:
DB-managed MCP server list failure logs at warning (was pass).
collector.py:
Node poll failure upgraded from debug to warning with exc_info.
Health fetch failure logs at debug with exc_info (was silent).
bridge.py:
Best-effort plan rejection logs at warning (was suppress).
Malformed SSE data logs at debug (was suppress).
session.py:
Tool output UI callback failure logs at debug (was suppress).
* fix: stagger collector poll with deterministic per-node jitter
Each node gets a stable offset within the first half of the poll
interval, derived from hashing the node_id against a Mersenne prime
(2^31 - 1). This spreads HTTP requests across the cycle instead of
firing all 100+ at the same instant.
Also raises poll interval from 10s to 15s and HTTP timeout from 5s
to 30s for large-cluster resilience.
* fix: add startup jitter to bridge heartbeat and health monitor probe
Bridge heartbeat: deterministic per-node jitter (from node_id hash)
spreads initial registration across the first quarter of the heartbeat
TTL. At 100 bridges with 60s TTL, heartbeats spread across 15s instead
of all firing at T=0.
Health monitor probe: deterministic per-process jitter (from PID hash)
spreads initial LLM backend probes across half the probe interval. At
100 servers with 30s interval, probes spread across 15s instead of all
hitting the LLM at T=30.
Both use the same Mersenne prime hashing approach as the collector poll
jitter for consistency.
* fix: split collector httpx timeout and raise keepalive pool
Use separate connect/read/write/pool timeouts instead of a single 30s
for all phases. Raise keepalive connections from 50 to 200 so the
collector reuses TCP connections across poll cycles instead of
constantly tearing down and re-establishing them.
* fix: narrow detect_model return type for CLI and eval callers
detect_model() now returns tuple[str | None, int | None] to support
fatal=False. CLI and eval always use fatal=True (the default), which
guarantees a non-None model or SystemExit. Add assert to narrow the
type for mypy.
Replaces postgres:18-alpine with pgautoupgrade/pgautoupgrade:18-alpine
in compose.yaml. Sets PGDATA=/var/lib/postgresql/data so pgautoupgrade
detects existing pg17 data and runs pg_upgrade automatically on first
start. No manual migration needed.
Also increases healthcheck start_period to 30s to accommodate the
one-time upgrade process.
Add ddgCluster profile extending the 10-node cluster with a DuckDuckGo
Search MCP sidecar. All cluster nodes connect via streamable-http and
gain duckduckgo_web_search + duckduckgo_fetch_content tools. No API
key required.
Key implementation details learned during testing:
- MCP SDK DNS rebinding protection must be disabled for Docker
internal networking (Host header uses container names)
- FastMCP server binds to 127.0.0.1 by default; must set
mcp.settings.host='0.0.0.0' for cross-container access
- DDG CLI lacks --host/--port flags; settings configured via Python
entry point that patches FastMCP.settings directly
- Safe search disabled by default
Also adds MCP_CONFIG env var support to all server commands (shell
conditional, no-op when empty) and moves default server/bridge to
production profile for cleaner profile separation.
* refactor: use raw streaming for SSE proxy to preserve event framing
- Replace httpx_sse aconnect_sse with raw httpx.stream for SSE proxy
- Stream bytes verbatim to preserve server-side ping comments and event framing
- Add StreamingResponse with proper headers (Cache-Control, X-Accel-Buffering)
- Update compose.yaml to add 'cluster' profile to the service
* Refactor SSE proxy to raw byte passthrough
- turnstone/console/server.py: Replace aconnect_sse + EventSourceResponse with
httpx.stream() + StreamingResponse for raw byte passthrough. Server pings,
events, and comments now flow through verbatim. Added per-request timeout
override (read=None, pool=None) for long-lived SSE streams.
- tests/test_console.py: Add 3 new tests for SSE proxy:
- Ping and event preservation
- Upstream error status handling
- Client disconnect handling
- docs/console.md: Update SSE Proxy section to reflect raw byte passthrough
approach.
Two runtime bugs:
1. Channel gateway advertised http://127.0.0.1:8091 which is
unreachable from other Docker containers. Add
TURNSTONE_CHANNEL_ADVERTISE_URL env var override for Docker/K8s
environments, set to http://channel:8091 in compose.yaml, and
pass --http-host=0.0.0.0 so the gateway listens on all interfaces.
2. Console proxy service JWT had only "write" scope but the approval
endpoint requires "approve". Tool approval buttons in the server
web UI silently failed when accessed through the console proxy.
Changed proxy token scopes to read+write+approve.
* Add user identity, JWT auth, and admin console UI (#23)
JWT-based authentication with three token types: config-file (hmac,
backward-compat), API tokens (ts_ prefix, SHA-256 hashed), and JWTs
(HS256, 24h expiry). Username:password login via bcrypt. Hierarchical
scopes: read < write < approve.
New tables: users (username, password_hash), api_tokens (token_hash,
scopes, expires), channel_users (future channel integrations). user_id
column added to sessions and workstreams for attribution.
Console owns admin CRUD (6 endpoints under /api/admin/). Server
validates JWTs locally with shared signing secret. Public /api/auth/setup
endpoint for first-time admin creation (atomic, only works with zero
users). turnstone-admin CLI for user/token management.
Admin console UI: Users and Tokens tabs with full CRUD modals, scope
badges, token show-once with clipboard copy, keyboard accessibility
(focus traps, Escape, arrow key tabs, ARIA roles).
Login UI redesigned: username:password primary, token toggle for legacy,
setup wizard auto-detected via /api/auth/status. Python + TypeScript
SDKs updated with login(username, password), authStatus(), setup().
New docs/security.md + diagram 15-auth-architecture.puml. All existing
docs updated. OpenAPI specs include all new endpoints. 64 new tests
(1023 total). Dependencies: PyJWT, bcrypt.
* Fix auth bugs, XSS vector, and doc inaccuracies from PR #23 review
Address Copilot review feedback: escape double quotes in escapeHtml()
to prevent XSS in HTML attributes, add JWT validation fallback so
config tokens containing dots still work, add user_id to
AuthLoginResponse schema, return created field from admin_create_user,
and correct five documentation files to match actual API behavior.
* Add cluster-scale schema, fix console proxy UX, harden SDK sync runner
Schema redesign for multi-node deployments:
- New `workstreams` table with node_id, state, lifecycle tracking
- Add node_id + ws_id columns to sessions table with indexes
- Full UUID (32 hex) for session_id and ws_id (was truncated 12/8)
- Server generates and owns node_id, bridge retrieves via /health
- Bridge retries with exponential backoff, fatal on auth errors
- WorkstreamManager persists workstreams and state changes to storage
- /health endpoint exposes node_id for bridge discovery
Console proxy UX fixes:
- Remove duplicate turnstone branding from proxy banner
- Same-tab navigation for Open Node UI and workstream deep links
SDK _SyncRunner fix:
- Sentinel pattern for StopAsyncIteration across thread boundary
Remove misplaced PNGs from docs/diagrams/ (correct copies in png/ subdir).
* Address PR #22 review feedback
- Fix CLI session_factory signature (ws_id param) — CI typecheck failure
- First-phase eviction in create() now calls _cleanup_ui + record_eviction
- close() persists "closed" state to storage via update_workstream_state
- Fix noqa comment in test to pragma: no cover
* Fix console proxy regressions and add workstream task field (#21)
Bug fixes:
- Fix collector polling unversioned /api/dashboard (404 after API
versioning PR) — nodes showed red/unreachable, no workstreams
- Fix SSE proxy dropping all data events — upstream sends \r\n line
endings but proxy split on \n\n only; normalize before parsing
- Fix workstream state stuck on idle — on_state_change() only
broadcasted via SSE but never updated ws.state on the Workstream
object; dashboard polling now sees correct attention/running states
- Fix deep-link switchTab early return — when ?ws_id matched the
only workstream, switchTab bailed (wsId === currentWsId) before
establishing SSE connection; inline init instead of delegating
- Fix console banner covering dashboard overlay — inject <style>
offsetting .dashboard-overlay below the 32px banner
Enhancements:
- Add turnstone branding to console proxy banner (turnstone │ Console │ node-id)
- Add initial_message field to CreateWorkstreamMessage protocol and
console "New Workstream" modal (Task textarea, sent as first message)
- Refactor SSE proxy to use shared httpx client with 30s read timeout
instead of per-request client creation
- Increase approval timeout default from 300s to 3600s (1 hour)
Updated: Python SDK, TypeScript SDK, OpenAPI specs, MQ client,
API schemas, MQ protocol diagram, SDK docs.
* Address PR #21 review feedback (4 items)
- Log unknown state strings in on_state_change instead of silently
swallowing; remove unnecessary KeyError catch
- Wrap initial_message POST in _handle_create_ws with error handling
so workstream creation success isn't masked by send failure
- Strip all \r from SSE chunks instead of replacing \r\n, fixing
chunk-boundary split edge case
- Add tests for initial_message wiring in directed and pool targeting
* Refactor SSE proxy to use httpx-sse aconnect_sse
Replace manual SSE chunk buffering/parsing with httpx_sse.aconnect_sse()
which handles line endings, event types, and all SSE spec edge cases.
Eliminates the \r\n chunk-boundary bug class entirely. Event types are
now always forwarded (sse.event defaults to "message" per spec).
* Quality overhaul: code tooling, CI/CD, architecture diagrams, UI redesign, and legacy cleanup
- Add ruff (lint+format) and mypy (strict) with zero errors across 37 source files
- Add GitHub Actions CI (lint, typecheck, test matrix 3.11/3.12/3.13) and PyPI publish workflow
- Create 12 PlantUML architecture diagrams with PNG renders covering all subsystems
- Refresh README and docs with badges, diagram links, and current descriptions
- Refactor test_server_live.py with mock streaming helpers for deterministic CI testing
- Update dependencies to current versions (openai>=2.24, httpx>=0.28, redis>=7.2)
Console dashboard:
- Move state indicators from top cards to fixed bottom status bar with cluster metrics
- Replace flat 50-node list with hostname-prefix grouped nodes (expand/collapse, up to 1000)
- Apply "Instrument Panel" visual redesign: IBM Plex Mono + Outfit fonts, warm amber accent,
LED glow state indicators, deep charcoal surfaces, WCAG AA contrast compliance
- Add render cache, stale indicator, active filter highlight, loading states
Server web UI:
- Apply matching Instrument Panel aesthetic for visual consistency with console
- Fix branding (pcode → turnstone), extract inline styles to CSS classes
- Rename pcode localStorage keys and history state to turnstone
Legacy cleanup:
- Remove persona-model-specific --persona flag and /persona slash command
- Remove model_identity from chat_template_kwargs (vLLM-specific mechanism)
- Refactor plan agent to use standard developer message instead of model_identity
- Remove dead code (unused date/has_tools variables, noqa suppressions)
* Fix CI typecheck: add mypy overrides for optional sympy/numpy imports
The math sandbox optionally imports sympy and numpy at runtime (try/except
ImportError). In CI these packages are not installed, so mypy raises
import-not-found rather than import-untyped. Add mypy overrides to
ignore missing imports for these optional dependencies.
* Fix Copilot review findings: ARIA role, status bar cache, and pulse opacity
- Change #node-table from role="tree" to role="list" and group elements
from role="treeitem" to role="listitem" (proper ARIA semantics)
- Include currentView and currentFilter.state in renderStatusBar cache key
so active pill highlight updates when switching views
- Align pulse animation to 0.35 opacity (already applied in CSS)
Patrick Buckley