feat(server): enterprise concurrent access — SSE/HTTP transport, rate limiting, metrics#89
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… limiting, metrics (#88) - Add server: config section (transport, host, port, auth, rate_limit, metrics) - Support SSE and streamable-http transport via FastMCP (--transport CLI override) - Thread-safe QueryCache, BM25 build lock, orchestrator double-checked locking - ChromaDB WAL mode for concurrent reads in SSE/HTTP mode - Optional rate limiting (sliding-window, decorator-based, disabled by default) - Optional Prometheus metrics endpoint (disabled by default) - All 12 MCP tools instrumented with @rate_limited + @Instrument decorators - Auto-enable single-instance lock in SSE/HTTP mode - New optional dependency: pip install knowledge-rag[server] - Version bump: 3.9.1 -> 4.0.0 Closes #88
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Summary
Enterprise-grade concurrent access for knowledge-rag. 1 server serves N clients via SSE/HTTP transport.
New Features
server.transport: "sse"or--transport sseCLI/metricsendpoint (disabled by default)@rate_limited+@instrumentdecorators (zero-cost when disabled)Config
Migration
stdio— zero breaking changes for existing userspip install knowledge-rag[server]+ setserver.transport: "sse"Files changed
mcp_server/config.py— 9 new server config fieldsmcp_server/server.py— transport switching, thread safety, decorator applicationmcp_server/ratelimit.py— NEW: sliding window rate limitermcp_server/metrics.py— NEW: Prometheus metrics collectorconfig.example.yaml— server section documentationpyproject.toml— version 4.0.0, mcp>=1.6.0, [server] optional depREADME.md— v4.0.0 changelogCloses #88