cameleer-server/HOWTO.md

HOWTO — Cameleer3 Server

Prerequisites

• Java 17+
• Maven 3.9+
• Docker & Docker Compose
• Access to the Gitea Maven registry (for cameleer3-common dependency)

Build

mvn clean compile          # compile only
mvn clean verify           # compile + run all tests (needs Docker for integration tests)

Infrastructure Setup

Start ClickHouse:

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

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)

# 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

# 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):

# 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):

docker exec -it cameleer3-server-clickhouse-1 clickhouse-client \
  --user cameleer --password cameleer_dev -d cameleer3 \
  -q "SELECT count() FROM route_executions"