reflowfy 0.1.3

A horizontally scalable data movement and transformation framework

Reflowfy

A horizontally scalable data movement and transformation framework

Reflowfy enables you to build pipelines that fetch data from sources, apply custom transformations, and send results to destinations—all with millions+ record scalability.

🎯 Key Features

• Horizontally Scalable: Process millions of records in parallel
• Kafka-Based: Reliable message queue for job distribution
• Kubernetes-Native: KEDA autoscaling from 0 to N workers
• Order-Independent: Maximum parallelism without coordination overhead
• User-Extensible: Plugin architecture for sources, destinations, and transformations
• Two Execution Modes: Local testing and distributed production execution

🏗 Architecture

User Request
    ↓ HTTP
API (FastAPI) ────→ ReflowManager Service (port 8001)
    │                    ↓
    │                PostgreSQL (state + checkpoints)
    │                    ↓
    │                Kafka Producer (rate limited) → Kafka Topic (reflow.jobs)
    │                    ↓
    │                Worker Pool (KEDA scaled)
    │                    ↓
    └─→ Execution Tracking  Destinations

Components:

• API: Orchestration, job splitting, route generation
• ReflowManager: Rate limiting, state management, checkpointing
• PostgreSQL: Persistent state storage for executions and checkpoints
• Kafka: Job queue and load balancing
• Workers: Generic executors that process jobs
• KEDA: Kafka lag-based autoscaling

� Documentation

• Fresh Project Guide: Start here to build a new project.
• ReflowManager Architecture: Deep dive into the rate-limiting core.
• OpenShift Deployment: Enterprise deployment guide.
• E2E Testing: How to test your pipelines.

�🚀 Quick Start

1. Define a Custom Transformation

from reflowfy import BaseTransformation

class XmlToJson(BaseTransformation):
    name = "xml_to_json"
    
    def apply(self, records, context):
        # Your transformation logic
        return [parse_xml(r) for r in records]

2. Build a Pipeline

from reflowfy import build_pipeline, pipeline_registry
from reflowfy import elastic_source, kafka_destination

# Configure source with runtime parameters
source = elastic_source(
    url="http://elasticsearch:9200",
    index="logs-*",
    base_query={
        "query": {
            "range": {
                "@timestamp": {
                    "gte": "{{ start_time }}",  # Runtime parameter
                    "lte": "{{ end_time }}"
                }
            }
        }
    }
)

# Configure destination
destination = kafka_destination(
    bootstrap_servers="kafka:9092",
    topic="processed-logs"
)

# Build and register
pipeline = build_pipeline(
    name="elastic_xml_pipeline",
    source=source,
    transformations=[XmlToJson()],
    destination=destination,
    rate_limit={"jobs_per_second": 50}
)

pipeline_registry.register(pipeline)

3. Start the API

# In your main.py
from reflowfy.api.app import main
import examples.xml_to_json_pipeline  # Import to trigger registration

if __name__ == "__main__":
    main()

4. Execute Pipeline

Run Distributed (async via Kafka):

curl -X POST http://localhost:8001/run \
  -H "Content-Type: application/json" \
  -d '{
    "pipeline_name": "elastic_xml_pipeline",
    "runtime_params": {
      "start_time": "2024-01-01",
      "end_time": "2024-01-02"
    }
  }'

Dry Run (Preview jobs without executing):

curl -X POST http://localhost:8001/run \
  -H "Content-Type: application/json" \
  -d '{
    "pipeline_name": "elastic_xml_pipeline",
    "runtime_params": {
      "start_time": "2024-01-01",
      "end_time": "2024-01-02"
    },
    "dry_run": true
  }'

Returns a preview of the job execution plan, sample records, and configuration.

📦 Installation

# Using pip
pip install -e .

# Using Docker
docker build -f Dockerfile.api -t reflowfy-api .
docker build -f Dockerfile.worker -t reflowfy-worker .

🔌 Built-in Connectors

Sources

• Elasticsearch: Scroll-based pagination with runtime parameters
• SQL: ID range and offset-based splitting (Postgres, MySQL, etc.)
• HTTP API: Offset/cursor pagination with authentication

Destinations

• Kafka: Batching, compression, health checks
• HTTP: Webhooks with retry logic

⚙️ Configuration

Environment Variables

API:

API_HOST=0.0.0.0
API_PORT=8000
KAFKA_BOOTSTRAP_SERVERS=kafka:9092
KAFKA_TOPIC=reflow.jobs

Worker:

KAFKA_BOOTSTRAP_SERVERS=kafka:9092
KAFKA_TOPIC=reflow.jobs
KAFKA_GROUP_ID=reflowfy-workers

Mode	Endpoint	Use Case	Kafka	Workers
Distributed	POST /run	Production execution	✅	✅
Dry Run	POST /run (dry_run=true)	Preview/Testing	❌	❌

📊 Monitoring

Reflowfy exposes Prometheus metrics:

• reflowfy_jobs_processed_total - Total jobs processed
• reflowfy_job_processing_duration_seconds - Job processing time
• reflowfy_records_processed_total - Total records processed
• reflowfy_active_workers - Active worker count

🐳 Kubernetes Deployment

# Deploy with Helm (using bundled charts)
# Note: For production, we recommend using the CLI 'reflowfy deploy'
helm install reflowfy-api ./reflowfy/helm/reflowfy-api
helm install reflowfy-worker ./reflowfy/helm/reflowfy-worker

KEDA will automatically scale workers based on Kafka lag.

📝 License

MIT

🤝 Contributing

Contributions welcome! This is a production-grade framework designed for real-world data processing at scale.