SoroScan: Soroban Event Indexer 🔍

The Graph for Soroban — index, query, and subscribe to smart contract events.

SoroScan is a developer-focused indexing service for Soroban smart contract events on the Stellar blockchain. It combines a Rust-based Soroban smart contract with a Django backend to provide real-time event ingestion, GraphQL/REST APIs, and webhook notifications.

Built for developers who need reliable event data without running their own infrastructure.

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✨ Key Features

• 🦀 Soroban Native: Rust smart contract with admin-controlled indexer whitelist and standardized event emission.
• 🐍 Django Backend: Production-ready REST API with Django Rest Framework and PostgreSQL storage.
• 📊 GraphQL Playground: Flexible event queries with Strawberry GraphQL — filter by contract, event type, ledger, or time range.
• 🔔 Webhook Subscriptions: Real-time event notifications with HMAC-signed payloads via Celery + Redis.
• ⚡ Horizon Integration: Stream ledger events directly from Stellar's Horizon API using stellar-sdk.

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🏗️ Architecture Overview

SoroScan follows a hybrid on-chain/off-chain pattern for maximum flexibility and reliability.

┌─────────────────────┐     ┌──────────────────────┐     ┌─────────────────┐
│   Soroban Contract  │────▶│   Django Backend     │────▶│   PostgreSQL    │
│   (Event Emitter)   │     │   (Ingestion Layer)  │     │   (Storage)     │
└─────────────────────┘     └──────────────────────┘     └─────────────────┘
                                      │
                    ┌─────────────────┼─────────────────┐
                    ▼                 ▼                 ▼
              REST API          GraphQL API       Webhooks

1. Smart Contract: Emits structured EventRecord events with admin-controlled access.
2. Ingestion Layer: Streams events from Horizon/Soroban RPC and persists to PostgreSQL.
3. Query Layer: Exposes data via REST, GraphQL, and push-based webhooks.

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🗂️ Project Structure

soroscan/
├── soroban-contracts/        # Rust smart contracts
│   └── soroscan_core/        # Core indexing contract
│       └── src/lib.rs        # Contract logic & event emission
└── django-backend/           # Python backend API
    └── soroscan/
        └── ingest/           # Ingestion & API module
            ├── models.py     # TrackedContract, ContractEvent, WebhookSubscription
            ├── views.py      # REST API viewsets
            ├── schema.py     # GraphQL schema (Strawberry)
            ├── stellar_client.py  # Soroban RPC interaction
            └── tasks.py      # Celery webhook dispatcher

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🚀 Quick Start

Get SoroScan running locally in under 5 minutes with Docker Compose.

Prerequisites

• Docker and Docker Compose
• (Optional) Rust + Soroban CLI for contract development

Using Docker Compose (Recommended)

# 1. Clone the repository
git clone https://github.com/SoroScan/soroscan.git
cd soroscan

# 2. Copy environment file and configure if needed
cp django-backend/.env.example django-backend/.env

# 3. Start all services (PostgreSQL, Redis, Django, Celery)
docker-compose up --build

# The backend will be available at:
# - REST API: http://localhost:8000/api/events/
# - GraphQL Playground: http://localhost:8000/graphql/
# - Django Admin: http://localhost:8000/admin/

That's it! The stack auto-runs migrations on startup and supports live code reloading.

Port Conflicts? Edit django-backend/.env and uncomment the port override variables.

Manual Setup (Advanced)

Click to expand manual installation steps

Prerequisites

• Python 3.11+
• PostgreSQL 15+
• Redis 7+

1. Set up the backend

cd django-backend
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate
pip install -r requirements.txt

# Configure environment
cp .env.example .env
# Edit .env and set DATABASE_URL to your local PostgreSQL instance

# Run migrations and start server
python manage.py migrate
python manage.py runserver

2. Start Celery worker (separate terminal)

cd django-backend
source venv/bin/activate
celery -A soroscan worker --loglevel=info

3. (Optional) Start Celery beat scheduler

cd django-backend
source venv/bin/activate
celery -A soroscan beat --loglevel=info

Deploy the Smart Contract (Optional)

cd soroban-contracts/soroscan_core
cargo build --target wasm32-unknown-unknown --release

# Deploy to testnet
soroban contract deploy \
  --wasm target/wasm32-unknown-unknown/release/soroscan_core.wasm \
  --network testnet

# Update SOROSCAN_CONTRACT_ID in django-backend/.env

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🚢 Production Deployment

SoroScan includes production-ready Kubernetes manifests for self-hosted deployments.

Prerequisites

• Kubernetes cluster (1.19+)
• kubectl configured
• PostgreSQL database (managed or self-hosted)
• Redis instance (managed or self-hosted)
• Container registry with SoroScan image
• (Optional) External Secrets Operator for secret management

1. Build and Push Container Image

Build the backend image with gunicorn:

cd django-backend

# Create Dockerfile if not exists
cat > Dockerfile <<EOF
FROM python:3.11-slim

WORKDIR /app

# Install dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# Create non-root user
RUN useradd -u 1000 -m appuser && chown -R appuser:appuser /app
USER appuser

EXPOSE 8000

# Default command uses gunicorn (override in k8s manifests for workers)
CMD ["gunicorn", "soroscan.wsgi:application", "--bind", "0.0.0.0:8000"]
EOF

# Build and push
docker build -t your-registry/soroscan-backend:v1.0.0 .
docker push your-registry/soroscan-backend:v1.0.0

2. Configure Secrets

Create secrets using kubectl or External Secrets Operator:

kubectl create secret generic soroscan-secrets \
  --from-literal=SECRET_KEY='your-django-secret-key' \
  --from-literal=DATABASE_URL='postgresql://user:pass@host:5432/dbname' \
  --from-literal=REDIS_URL='redis://redis:6379/0' \
  --from-literal=SOROSCAN_CONTRACT_ID='CXXXXXXXX' \
  --from-literal=INDEXER_SECRET_KEY='your-indexer-key' \
  -n soroscan

Or use External Secrets Operator (see k8s/secret-reference.yaml).

3. Update Configuration

Edit k8s/configmap.yaml:

• Set ALLOWED_HOSTS to your domain
• Configure SOROBAN_RPC_URL and STELLAR_NETWORK_PASSPHRASE for your network
• Set CORS_ALLOWED_ORIGINS if needed

Edit k8s/backend-deployment.yaml, k8s/worker-deployment.yaml, k8s/beat-cronjob.yaml:

• Replace soroscan/backend:v1.0.0 with your image

Edit k8s/ingress.yaml:

• Set your domain in host and tls sections
• Configure ingress class and annotations for your ingress controller

4. Deploy to Kubernetes

# Apply all manifests
kubectl apply -f k8s/

# Verify deployment
kubectl get pods -n soroscan
kubectl get svc -n soroscan
kubectl get ingress -n soroscan

# Check backend logs
kubectl logs -f deployment/soroscan-backend -n soroscan

# Check worker logs
kubectl logs -f deployment/soroscan-worker -n soroscan

5. Verify Deployment

# Check readiness
kubectl get pods -n soroscan -w

# Test API endpoint
curl https://your-domain.com/api/events/

# Check migrations completed
kubectl logs deployment/soroscan-backend -n soroscan --previous

Architecture

The Kubernetes deployment includes:

• Backend Deployment: Django + gunicorn with readinessProbe on /api/events/
• Worker Deployment: Celery workers for default queue
• Worker Backfill Deployment: Dedicated workers for backfill queue
• Beat Deployment: Celery beat scheduler (single replica)
• Service: ClusterIP service exposing backend
• Ingress: HTTP/HTTPS routing to backend service

Scaling

# Scale backend pods
kubectl scale deployment/soroscan-backend --replicas=4 -n soroscan

# Scale worker pods
kubectl scale deployment/soroscan-worker --replicas=3 -n soroscan

# Note: Beat scheduler must remain at 1 replica

Troubleshooting

• Migrations not running: Check init container logs: kubectl logs pod/soroscan-backend-xxx -n soroscan -c migrate
• Database connection failed: Verify DATABASE_URL secret is correct
• Redis connection failed: Verify REDIS_URL secret and Redis accessibility
• Readiness probe failing: Check /api/events/ endpoint is accessible after migrations

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🤝 Contributing

1. Fork the repository and create your feature branch.
2. Look for issues labeled good-first-issue or help-wanted.
3. Submit a PR referencing the issue.

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🗺️ Roadmap

Phase 1: Core Infrastructure (Current)

• Soroban smart contract with event emission
• Django backend with REST API
• GraphQL schema with Strawberry
• Webhook subscriptions with Celery

Phase 2: Production Readiness

• Docker Compose setup for local development
• Kubernetes manifests for production deployment
• Rate limiting and API authentication
• Comprehensive test suite

Phase 3: Advanced Features

• Multi-contract indexing dashboard
• Historical backfill from Horizon archives
• Real-time WebSocket subscriptions
• SDK packages (Python, JavaScript)

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📄 License

This project is licensed under the MIT License.