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CodeStream

A real-time code execution pipeline built with Apache Kafka and Java.

Frontend

Next.js app in frontend/. It posts Python code to the api-service, polls for results, and shows stdout or errors.

# Terminal 1 — infrastructure (Kafka, PostgreSQL, schema registry)
docker compose up -d
# PostgreSQL: localhost:5432, db/user/password codestream
# Flyway migrations run automatically when api-service starts

# start api-service and worker-service per your usual workflow

# Terminal 2 — UI (rewrites /api → http://localhost:8082)
cd frontend
npm install
npm run dev

Open http://localhost:3000. Override the API target with API_SERVICE_URL (server rewrites) or NEXT_PUBLIC_API_BASE_URL (direct browser calls, e.g. http://localhost:8082).

AI error suggestions (Google AI Studio / Gemini)

When Python execution fails, the UI asks Gemini for a fix and shows a summary, explanation, and suggested code.

  1. Open Google AI Studio and sign in.
  2. Go to Get API key → Create API key (use an existing Google Cloud project or create one).
  3. Start api-service with the key:
export GEMINI_API_KEY="your-api-key-here"
mvn -pl api-service spring-boot:run

Optional: GEMINI_MODEL=gemini-2.5-flash (default). Older models like gemini-2.0-flash were shut down in June 2026. The key stays on the server only — never put it in the frontend.