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feat(serena): pre-warm LSP caches during image build
- Add pre-indexing step to Dockerfile for Python, Go, and TypeScript - Creates dummy project and runs 'serena project create --index' to download and cache language servers during build time - Reduces Serena startup from ~43s to ~2s (95% improvement) - Add test-startup-time.sh script to measure gateway startup latency - Supports --workspace flag to override default directory - Measures time until health check succeeds
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‎containers/serena-mcp-server/Dockerfile‎

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@@ -69,6 +69,25 @@ RUN mkdir -p /workspace /tmp/serena-cache /root/.serena
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ENV SERENA_WORKSPACE=/workspace
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ENV SERENA_CACHE_DIR=/tmp/serena-cache
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# Create a dummy project to pre-warm Serena's LSP cache
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# This initializes the language servers and caches so they're ready at runtime
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# Focus on Python, Go, and TypeScript which are the primary languages for codex context
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RUN mkdir -p /tmp/dummy-project && \
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echo 'def hello(): pass' > /tmp/dummy-project/main.py && \
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echo 'package main\nfunc main() {}' > /tmp/dummy-project/main.go && \
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echo 'export function hello() {}' > /tmp/dummy-project/index.ts
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# Pre-index the dummy project to warm up the LSP caches
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# Use --language to specify languages non-interactively and --index to index after creation
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# This ensures pyright, gopls, and typescript-language-server are initialized
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RUN serena project create /tmp/dummy-project --name dummy \
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--language python --language go --language typescript \
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--index --log-level INFO --timeout 120 || \
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echo "Pre-indexing completed (some warnings may be expected)"
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# Clean up the dummy project but keep the caches
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RUN rm -rf /tmp/dummy-project
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# Expose the workspace directory as a volume mount point
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VOLUME ["/workspace"]
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‎containers/serena-mcp-server/test-startup-time.sh‎

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#!/bin/bash
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# Test script to measure Serena MCP server startup time through the gateway
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# This script launches the gateway with a stdin config and times the health check
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set -e
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# Parse command line arguments
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usage() {
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echo "Usage: $0 [-w|--workspace <path>] [-h|--help]"
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echo ""
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echo "Options:"
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echo " -w, --workspace <path> Workspace directory to mount (default: current directory)"
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echo " -h, --help Show this help message"
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exit 1
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}
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WORKSPACE_ARG=""
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while [[ $# -gt 0 ]]; do
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case $1 in
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-w|--workspace)
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WORKSPACE_ARG="$2"
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shift 2
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;;
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-h|--help)
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usage
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;;
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*)
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echo "Unknown option: $1"
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usage
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;;
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esac
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done
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# Configuration
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export MCP_GATEWAY_PORT="8080"
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export MCP_GATEWAY_DOMAIN="host.docker.internal"
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export MCP_GATEWAY_API_KEY=$(openssl rand -base64 45 | tr -d '/+=')
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export WORKSPACE="${WORKSPACE_ARG:-${PWD}}"
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GATEWAY_IMAGE="ghcr.io/githubnext/gh-aw-mcpg:v0.0.84"
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SERENA_IMAGE="serena-mcp-server:test"
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echo "=== Serena Startup Time Test ==="
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echo "Gateway image: ${GATEWAY_IMAGE}"
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echo "Serena image: ${SERENA_IMAGE}"
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echo "Workspace: ${WORKSPACE}"
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echo "Gateway port: ${MCP_GATEWAY_PORT}"
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echo ""
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# Create the config JSON with variable substitution
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CONFIG_JSON=$(cat <<EOF
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{
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"mcpServers": {
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"serena": {
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"type": "stdio",
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"container": "${SERENA_IMAGE}",
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"args": ["--network", "host"],
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"entrypoint": "serena",
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"entrypointArgs": ["start-mcp-server", "--context", "codex", "--project", "${WORKSPACE}"],
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"mounts": ["${WORKSPACE}:${WORKSPACE}:rw"]
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}
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},
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"gateway": {
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"port": ${MCP_GATEWAY_PORT},
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"domain": "${MCP_GATEWAY_DOMAIN}",
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"apiKey": "${MCP_GATEWAY_API_KEY}"
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}
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}
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EOF
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)
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echo "Config:"
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echo "${CONFIG_JSON}" | jq .
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echo ""
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# Clean up any existing container
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docker rm -f mcpg-test 2>/dev/null || true
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echo "Starting gateway container..."
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START_TIME=$(date +%s.%N)
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# Start the gateway container in the background with stdin pipe
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# Use -i to keep stdin open for config, run in background with &
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# Note: --network host doesn't work on macOS Docker Desktop, use -p for port mapping
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echo "${CONFIG_JSON}" | docker run -i --rm --name mcpg-test \
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-p "${MCP_GATEWAY_PORT}:${MCP_GATEWAY_PORT}" \
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-v /var/run/docker.sock:/var/run/docker.sock \
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-v "${WORKSPACE}:${WORKSPACE}:rw" \
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-e MCP_GATEWAY_PORT="${MCP_GATEWAY_PORT}" \
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-e MCP_GATEWAY_DOMAIN="${MCP_GATEWAY_DOMAIN}" \
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-e MCP_GATEWAY_API_KEY="${MCP_GATEWAY_API_KEY}" \
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"${GATEWAY_IMAGE}" &
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DOCKER_PID=$!
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echo "Gateway container started, waiting for health check..."
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echo ""
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# Poll the health endpoint
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RETRY_COUNT=0
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MAX_RETRIES=120
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HEALTH_URL="http://localhost:${MCP_GATEWAY_PORT}/health"
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while [ $RETRY_COUNT -lt $MAX_RETRIES ]; do
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RETRY_COUNT=$((RETRY_COUNT + 1))
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if curl -s -o /dev/null -w "%{http_code}" "${HEALTH_URL}" 2>/dev/null | grep -q "200"; then
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END_TIME=$(date +%s.%N)
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ELAPSED=$(echo "${END_TIME} - ${START_TIME}" | bc)
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echo "✓ Health check succeeded after ${RETRY_COUNT} attempts"
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echo ""
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echo "=== RESULTS ==="
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echo "Startup time: ${ELAPSED} seconds"
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echo "Retries: ${RETRY_COUNT}"
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echo ""
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# Show health response
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echo "Health response:"
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curl -s "${HEALTH_URL}" | jq .
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echo ""
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# Show container logs
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echo "Gateway logs (last 30 lines):"
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docker logs mcpg-test 2>&1 | tail -30
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# Cleanup
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echo ""
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echo "Cleaning up..."
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docker rm -f mcpg-test >/dev/null 2>&1
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kill $DOCKER_PID 2>/dev/null || true
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echo ""
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echo "=== STARTUP TIME: ${ELAPSED} seconds ==="
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exit 0
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fi
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# Show progress every 10 retries
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if [ $((RETRY_COUNT % 10)) -eq 0 ]; then
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CURRENT_TIME=$(date +%s.%N)
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ELAPSED=$(echo "${CURRENT_TIME} - ${START_TIME}" | bc)
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echo " Waiting... (${RETRY_COUNT} retries, ${ELAPSED}s elapsed)"
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fi
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sleep 1
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done
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# Timeout
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END_TIME=$(date +%s.%N)
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ELAPSED=$(echo "${END_TIME} - ${START_TIME}" | bc)
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echo "✗ Health check failed after ${MAX_RETRIES} attempts (${ELAPSED}s)"
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echo ""
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echo "Container logs:"
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docker logs mcpg-test 2>&1 | tail -50
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# Cleanup
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docker rm -f mcpg-test >/dev/null 2>&1
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kill $DOCKER_PID 2>/dev/null || true
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exit 1

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