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Hubble

Hubble is a multi-stage ETL indexer for various chains. Currently, it supports:

  • Aptos
  • Ethereum
  • Tendermint

with lightclient counterparty tracking.

Architecture

Hubble has two distinct data objects:

  • Logs: unparsed data obtained from archive nodes. Logs need further extraction before they are consumable.
  • Events: JSON formatted consumable logs.

For certain chains, such as CosmosSDK-based chains, we can omit the log extraction, as they already produce JSON formatted events. For EVM-based chains, a conversion from ethabi to JSON is performed for specific contracts.

Database Schema

Hubble uses the following tables:

  • Logs: log storage for extraction, contains block and transaction data.
  • Events: extracted events from logs.
  • Blocks: extracted blocks from logs.
  • Transactions: extracted transactions from logs.
  • Chains: metadata on chains, created once on startup.
  • Clients: Counterparty chain-ids of lightclients.
  • Contracts: updates of contract tracking height.