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CDK SOA backend components

Polygon CDK (Chain Development Kit) blockchain backend (off-chain) components/services for SOA (service-oriented architecture) backend infrastructure and SOA service bus (MOM/MQ, message-oriented middleware, message queue) based on NATS Server.

Components:

  • CDK Indexer service for indexing contract events.
  • CDK Indexer service (more generic) for indexing block data and providing request/response API and publisher/subscriber (producer/consumer) protocol for services over the NATS JetStream topics.
  • Transaction producer, library to include in other services. Includes wallet client functionality and KMS integration for storing private keys securely encrypted, for transaction signing.
  • Oracle service, for providing data from concrete API and DB.
  • Oracle service (more generic), on-chain contracts data provider component from off-chain data sources.
  • Merkle tree generator (includes transaction producer), for generating Merkle tree, compute root hash, for storing off-chain data for on-chain contracts.

CDK Indexer

Output example:

For an event:

event DataPosted(address sender, uint256 id, string message);

We'll get output:

{
  "sender": "0xabc123abc123abc123abc123abc123abc123abc1",
  "id": "42",
  "message": "Data are posted!"
}