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https://github.com/czlonkowski/n8n-mcp.git
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0d2d9bdd52
* fix: Critical memory leak in sql.js adapter (fixes #330) Resolves critical memory leak causing growth from 100Mi to 2.2GB over 72 hours in Docker/Kubernetes deployments. Problem Analysis: - Environment: Kubernetes/Docker using sql.js fallback - Growth rate: ~23 MB/hour (444Mi after 19 hours) - Pattern: Linear accumulation, garbage collection couldn't keep pace - Impact: OOM kills every 24-48 hours in memory-limited pods Root Causes: 1. Over-aggressive save triggering: prepare() called scheduleSave() on reads 2. Too frequent saves: 100ms debounce = 3-5 saves/second under load 3. Double allocation: Buffer.from() copied Uint8Array (4-10MB per save) 4. No cleanup: Relied solely on GC which couldn't keep pace 5. Docker limitation: Missing build tools forced sql.js instead of better-sqlite3 Code-Level Fixes (sql.js optimization): ✅ Removed scheduleSave() from prepare() (read operations don't modify DB) ✅ Increased debounce: 100ms → 5000ms (98% reduction in save frequency) ✅ Removed Buffer.from() copy (50% reduction in temporary allocations) ✅ Made save interval configurable via SQLJS_SAVE_INTERVAL_MS env var ✅ Added input validation (minimum 100ms, falls back to 5000ms default) Infrastructure Fix (Dockerfile): ✅ Added build tools (python3, make, g++) to main Dockerfile ✅ Compile better-sqlite3 during npm install, then remove build tools ✅ Image size increase: ~5-10MB (acceptable for eliminating memory leak) ✅ Railway Dockerfile already had build tools (added explanatory comment) Impact: With better-sqlite3 (now default in Docker): - Memory: Stable at ~100-120 MB (native SQLite) - Performance: Better than sql.js (no WASM overhead) - No periodic saves needed (writes directly to disk) - Eliminates memory leak entirely With sql.js (fallback only): - Memory: Stable at 150-200 MB (vs 2.2GB after 3 days) - No OOM kills in long-running Kubernetes pods - Reduced CPU usage (98% fewer disk writes) - Same data safety (5-second save window acceptable) Configuration: - New env var: SQLJS_SAVE_INTERVAL_MS (default: 5000) - Only relevant when sql.js fallback is used - Minimum: 100ms, invalid values fall back to default Testing: ✅ All unit tests passing ✅ New integration tests for memory leak prevention ✅ TypeScript compilation successful ✅ Docker builds verified (build tools working) Files Modified: - src/database/database-adapter.ts: SQLJSAdapter optimization - Dockerfile: Added build tools for better-sqlite3 - Dockerfile.railway: Added documentation comment - tests/unit/database/database-adapter-unit.test.ts: New test suites - tests/integration/database/sqljs-memory-leak.test.ts: Integration tests - package.json: Version bump to 2.20.2 - package.runtime.json: Version bump to 2.20.2 - CHANGELOG.md: Comprehensive v2.20.2 entry - README.md: Database & Memory Configuration section Closes #330 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * fix: Address code review findings for memory leak fix (#330) ## Code Review Fixes 1. **Test Assertion Error (line 292)** - CRITICAL - Fixed incorrect assertion in sqljs-memory-leak test - Changed from `expect(saveCallback).toBeLessThan(10)` - To: `expect(saveCallback.mock.calls.length).toBeLessThan(10)` - ✅ Test now passes (12/12 tests passing) 2. **Upper Bound Validation** - Added maximum value validation for SQLJS_SAVE_INTERVAL_MS - Valid range: 100ms - 60000ms (1 minute) - Falls back to default 5000ms if out of range - Location: database-adapter.ts:255 3. **Railway Dockerfile Optimization** - Removed build tools after installing dependencies - Reduces image size by ~50-100MB - Pattern: install → build native modules → remove tools - Location: Dockerfile.railway:38-41 4. **Defensive Programming** - Added `closed` flag to prevent double-close issues - Early return if already closed - Location: database-adapter.ts:236, 283-286 5. **Documentation Improvements** - Added comprehensive comments for DEFAULT_SAVE_INTERVAL_MS - Documented data loss window trade-off (5 seconds) - Explained constructor optimization (no initial save) - Clarified scheduleSave() debouncing under load 6. **CHANGELOG Accuracy** - Fixed discrepancy about explicit cleanup - Updated to reflect automatic cleanup via function scope - Removed misleading `data = null` reference ## Verification - ✅ Build: Success - ✅ Lint: No errors - ✅ Critical test: sqljs-memory-leak (12/12 passing) - ✅ All code review findings addressed 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>
98 lines
3.5 KiB
Docker
98 lines
3.5 KiB
Docker
# syntax=docker/dockerfile:1.7
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# Ultra-optimized Dockerfile - minimal runtime dependencies (no n8n packages)
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# Stage 1: Builder (TypeScript compilation only)
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FROM node:22-alpine AS builder
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WORKDIR /app
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# Copy tsconfig files for TypeScript compilation
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COPY tsconfig*.json ./
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# Create minimal package.json and install ONLY build dependencies
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# Note: openai and zod are needed for TypeScript compilation of template metadata modules
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RUN --mount=type=cache,target=/root/.npm \
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echo '{}' > package.json && \
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npm install --no-save typescript@^5.8.3 @types/node@^22.15.30 @types/express@^5.0.3 \
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@modelcontextprotocol/sdk@^1.12.1 dotenv@^16.5.0 express@^5.1.0 axios@^1.10.0 \
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n8n-workflow@^1.96.0 uuid@^11.0.5 @types/uuid@^10.0.0 \
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openai@^4.77.0 zod@^3.24.1 lru-cache@^11.2.1 @supabase/supabase-js@^2.57.4
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# Copy source and build
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COPY src ./src
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# Note: src/n8n contains TypeScript types needed for compilation
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# These will be compiled but not included in runtime
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RUN npx tsc -p tsconfig.build.json
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# Stage 2: Runtime (minimal dependencies)
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FROM node:22-alpine AS runtime
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WORKDIR /app
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# Install only essential runtime tools
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RUN apk add --no-cache curl su-exec && \
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rm -rf /var/cache/apk/*
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# Copy runtime-only package.json
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COPY package.runtime.json package.json
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# Install runtime dependencies with better-sqlite3 compilation
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# Build tools (python3, make, g++) are installed, used for compilation, then removed
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# This enables native SQLite (better-sqlite3) instead of sql.js, preventing memory leaks
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RUN --mount=type=cache,target=/root/.npm \
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apk add --no-cache python3 make g++ && \
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npm install --production --no-audit --no-fund && \
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apk del python3 make g++
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# Copy built application
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COPY --from=builder /app/dist ./dist
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# Copy pre-built database and required files
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# Cache bust: 2025-07-06-trigger-fix-v3 - includes is_trigger=true for webhook,cron,interval,emailReadImap
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COPY data/nodes.db ./data/
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COPY src/database/schema-optimized.sql ./src/database/
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COPY .env.example ./
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# Copy entrypoint script, config parser, and n8n-mcp command
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COPY docker/docker-entrypoint.sh /usr/local/bin/
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COPY docker/parse-config.js /app/docker/
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COPY docker/n8n-mcp /usr/local/bin/
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RUN chmod +x /usr/local/bin/docker-entrypoint.sh /usr/local/bin/n8n-mcp
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# Add container labels
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LABEL org.opencontainers.image.source="https://github.com/czlonkowski/n8n-mcp"
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LABEL org.opencontainers.image.description="n8n MCP Server - Runtime Only"
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LABEL org.opencontainers.image.licenses="MIT"
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LABEL org.opencontainers.image.title="n8n-mcp"
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# Create non-root user with unpredictable UID/GID
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# Using a hash of the build time to generate unpredictable IDs
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RUN BUILD_HASH=$(date +%s | sha256sum | head -c 8) && \
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UID=$((10000 + 0x${BUILD_HASH} % 50000)) && \
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GID=$((10000 + 0x${BUILD_HASH} % 50000)) && \
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addgroup -g ${GID} -S nodejs && \
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adduser -S nodejs -u ${UID} -G nodejs && \
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chown -R nodejs:nodejs /app
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# Switch to non-root user
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USER nodejs
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# Set Docker environment flag
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ENV IS_DOCKER=true
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# Telemetry: Anonymous usage statistics are ENABLED by default
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# To opt-out, uncomment the following line:
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# ENV N8N_MCP_TELEMETRY_DISABLED=true
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# Expose HTTP port
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EXPOSE 3000
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# Set stop signal to SIGTERM (default, but explicit is better)
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STOPSIGNAL SIGTERM
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# Health check
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HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
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CMD curl -f http://127.0.0.1:3000/health || exit 1
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# Optimized entrypoint
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ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
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CMD ["node", "dist/mcp/index.js"]
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