wehub-resource-sync
135 lines
5.1 KiB
Bash
135 lines
5.1 KiB
Bash
#!/bin/bash
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set -e
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cleanup() {
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kill $AGENT_PID $NEXTJS_PID $WATCHDOG_PID 2>/dev/null || true
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}
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trap cleanup EXIT
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# Disable Python stdout buffering so langgraph_cli's dev server and any
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# tracebacks it emits reach the Railway log stream immediately rather than
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# sitting in Python's userspace buffer until the process exits.
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export PYTHONUNBUFFERED=1
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echo "========================================="
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echo "[entrypoint] Starting showcase package: langgraph-fastapi"
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echo "[entrypoint] Time: $(date -u)"
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echo "[entrypoint] PORT=${PORT:-not set}"
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echo "========================================="
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if [ -z "$OPENAI_API_KEY" ]; then
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echo "[entrypoint] WARNING: OPENAI_API_KEY is not set! Agent will fail."
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else
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echo "[entrypoint] OPENAI_API_KEY: set (${#OPENAI_API_KEY} chars)"
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fi
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echo "[entrypoint] Starting LangGraph agent server on port 8123..."
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# Disable langgraph_runtime_inmem's pickle-flush-to-disk loop. Without this,
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# the inmem runtime periodically flushes unbounded thread/checkpoint state to
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# .langgraph_api/*.pckl files, which is a slow-burn OOM risk on Railway.
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# The env var is checked at import time in langgraph_runtime_inmem
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# _persistence.py and checkpoint.py (langgraph-api==0.7.101 / runtime==0.27.4).
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export LANGGRAPH_DISABLE_FILE_PERSISTENCE=true
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# `python -u` + `awk ... fflush()`: unbuffered stdout at the interpreter
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# level + line-flushed awk prefixer so tracebacks reach the container log
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# immediately rather than block-buffered in pipe buffers.
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# `--no-reload` disables watchfiles hot-reload, which fires on every request
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# and causes "1 change detected" log spam → Railway 500-logs/sec kill.
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python -u -m langgraph_cli dev \
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--config langgraph.json \
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--host 0.0.0.0 \
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--port 8123 \
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--no-browser \
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--no-reload &> >(awk '{print "[agent] " $0; fflush()}') &
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AGENT_PID=$!
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sleep 3
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if kill -0 $AGENT_PID 2>/dev/null; then
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echo "[entrypoint] LangGraph agent started (PID: $AGENT_PID)"
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else
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echo "[entrypoint] ERROR: LangGraph agent failed to start — exiting"
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exit 1
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fi
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echo "========================================="
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echo "[entrypoint] Starting Next.js frontend on port ${PORT:-10000}..."
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echo "========================================="
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PORT=${PORT:-10000}
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env NODE_ENV=production npx next start --port $PORT &> >(awk '{print "[nextjs] " $0; fflush()}') &
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NEXTJS_PID=$!
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echo "[entrypoint] Next.js started (PID: $NEXTJS_PID)"
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# Watchdog: Railway deploys of showcase packages have been observed to hit a
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# silent agent hang — the agent process stays alive (so `wait -n` never
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# fires and the container never restarts) but stops responding on :8123.
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# Poll the agent's /ok endpoint (langgraph_cli's health path) every 30s;
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# after 3 consecutive failures (~90s of unreachable agent), kill the agent
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# process so `wait -n` returns and Railway restarts the container.
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# Generalized from showcase/integrations/crewai-crews/entrypoint.sh (PRs #4114
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# + #4115).
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#
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# Startup grace: langgraph_cli dev does a heavy cold-start (graph compile
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# + uvicorn boot). On fresh Railway containers this can exceed the 90s
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# (3-strike) budget introduced in PR #4116, matching the restart loop
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# observed on langgraph-typescript (deployment
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# 58bbebe8-7a94-4f99-b6e4-ffcbb4eb78b9, 04-20 17:05 UTC). Wait up to 180s
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# for the first healthy /ok probe before arming the strike counter; if
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# /ok comes up sooner, fall through immediately. If 180s elapses without
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# success, arm the counter anyway — the steady-state watchdog will then
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# handle a true hang.
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(
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GRACE=180
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echo "[watchdog] Startup grace: waiting up to ${GRACE}s for first successful health probe before arming strike counter"
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ELAPSED=0
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while [ $ELAPSED -lt $GRACE ]; do
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if ! kill -0 $AGENT_PID 2>/dev/null; then
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# Agent died during startup — wait -n in the main shell will handle it.
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exit 0
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fi
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if curl -fsS --max-time 5 http://127.0.0.1:8123/ok > /dev/null 2>&1; then
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echo "[watchdog] Agent healthy after ${ELAPSED}s — arming strike counter"
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break
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fi
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sleep 5
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ELAPSED=$((ELAPSED + 5))
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done
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if [ $ELAPSED -ge $GRACE ]; then
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echo "[watchdog] Grace window elapsed without successful probe — arming strike counter anyway"
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fi
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FAILS=0
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while sleep 30; do
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if ! kill -0 $AGENT_PID 2>/dev/null; then
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break
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fi
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if curl -fsS --max-time 5 http://127.0.0.1:8123/ok > /dev/null 2>&1; then
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FAILS=0
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else
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FAILS=$((FAILS + 1))
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echo "[watchdog] Agent health probe failed (count=$FAILS)"
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if [ $FAILS -ge 3 ]; then
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echo "[watchdog] Agent unresponsive for ~90s — killing PID $AGENT_PID to trigger container restart"
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kill -9 $AGENT_PID 2>/dev/null || true
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break
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fi
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fi
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done
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) &
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WATCHDOG_PID=$!
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echo "[entrypoint] Watchdog started (PID: $WATCHDOG_PID, startup grace 180s)"
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echo "[entrypoint] Agent PID=$AGENT_PID, Next PID=$NEXTJS_PID"
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wait -n $AGENT_PID $NEXTJS_PID
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EXIT_CODE=$?
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if ! kill -0 $AGENT_PID 2>/dev/null; then
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echo "[entrypoint] Agent (PID: $AGENT_PID) exited with code $EXIT_CODE"
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elif ! kill -0 $NEXTJS_PID 2>/dev/null; then
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echo "[entrypoint] Next.js (PID: $NEXTJS_PID) exited with code $EXIT_CODE"
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else
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echo "[entrypoint] A process exited with code $EXIT_CODE"
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fi
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exit $EXIT_CODE
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