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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-11 13:51:10 +01:00

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# HOWTO — Cameleer3 Server
## Prerequisites
- Java 17+
- Maven 3.9+
- Docker & Docker Compose
- Access to the Gitea Maven registry (for `cameleer3-common` dependency)
## Build
```bash
mvn clean compile # compile only
mvn clean verify # compile + run all tests (needs Docker for integration tests)
```
## Infrastructure Setup
Start ClickHouse:
```bash
docker compose up -d
```
This starts ClickHouse 25.3 and automatically runs the schema init script (`clickhouse/init/01-schema.sql`).
| Service | Port | Purpose |
|------------|------|------------------|
| ClickHouse | 8123 | HTTP API (JDBC) |
| ClickHouse | 9000 | Native protocol |
ClickHouse credentials: `cameleer` / `cameleer_dev`, database `cameleer3`.
## Run the Server
```bash
mvn clean package -DskipTests
java -jar cameleer3-server-app/target/cameleer3-server-app-1.0-SNAPSHOT.jar
```
The server starts on **port 8081**.
## API Endpoints
### Ingestion (POST, returns 202 Accepted)
```bash
# Post route execution data
curl -s -X POST http://localhost:8081/api/v1/data/executions \
-H "Content-Type: application/json" \
-H "X-Protocol-Version: 1" \
-d '{"agentId":"agent-1","routeId":"route-1","executionId":"exec-1","status":"COMPLETED","startTime":"2026-03-11T00:00:00Z","endTime":"2026-03-11T00:00:01Z","processorExecutions":[]}'
# Post route diagram
curl -s -X POST http://localhost:8081/api/v1/data/diagrams \
-H "Content-Type: application/json" \
-H "X-Protocol-Version: 1" \
-d '{"agentId":"agent-1","routeId":"route-1","version":1,"nodes":[],"edges":[]}'
# Post agent metrics
curl -s -X POST http://localhost:8081/api/v1/data/metrics \
-H "Content-Type: application/json" \
-H "X-Protocol-Version: 1" \
-d '[{"agentId":"agent-1","metricName":"cpu","value":42.0,"timestamp":"2026-03-11T00:00:00Z","tags":{}}]'
```
**Note:** The `X-Protocol-Version: 1` header is required on all `/api/v1/data/**` endpoints. Missing or wrong version returns 400.
### Health & Docs
```bash
# Health check
curl -s http://localhost:8081/api/v1/health
# OpenAPI JSON
curl -s http://localhost:8081/api/v1/api-docs
# Swagger UI
open http://localhost:8081/api/v1/swagger-ui.html
```
### Backpressure
When the write buffer is full (default capacity: 50,000), ingestion endpoints return **503 Service Unavailable**. Already-buffered data is not lost.
## Configuration
Key settings in `cameleer3-server-app/src/main/resources/application.yml`:
| Setting | Default | Description |
|---------|---------|-------------|
| `server.port` | 8081 | Server port |
| `ingestion.buffer-capacity` | 50000 | Max items in write buffer |
| `ingestion.batch-size` | 5000 | Items per ClickHouse batch insert |
| `ingestion.flush-interval-ms` | 1000 | Buffer flush interval (ms) |
| `ingestion.data-ttl-days` | 30 | ClickHouse TTL for auto-deletion |
## Running Tests
Integration tests use Testcontainers (starts ClickHouse automatically — requires Docker):
```bash
# All tests
mvn verify
# Unit tests only (no Docker needed)
mvn test -pl cameleer3-server-core
# Specific integration test
mvn test -pl cameleer3-server-app -Dtest=ExecutionControllerIT
```
## Verify ClickHouse Data
After posting data and waiting for the flush interval (1s default):
```bash
docker exec -it cameleer3-server-clickhouse-1 clickhouse-client \
--user cameleer --password cameleer_dev -d cameleer3 \
-q "SELECT count() FROM route_executions"
```