Hydra
Last updated
Was this helpful?
Last updated
Was this helpful?
A Substrate query node framework. Inspired by , it gives a smooth way to provide powerful GraphQL queries to app developers over your Substrate blockchain state and history.
That's where Hydra gets you covered. Define your data model and the Hydra indexer will get it in sync with the chain. On top of that, you get a batteries-included GraphQL server with comprehensive filtering, pagination, and even full-text search capabilities.
A Hydra query node ingests substrate events in a multi-step pipeline:
Run
and answer the prompts. It will generate a sample project and README with setup instructions.
The monorepo contains the following sub-packages:
is a query node for Substrate-based blockchains. A query node ingests data from a substrate chain and provides rich, domain-specific, and highly customizable access to the blockchain data, far beyond the scope of direct RPC calls. For example, expired spending are pruned from the state of the , so querying, say, one-year-old proposals is problematic. Indeed, one has to track the evolution of the state by sequentially applying the Treasury events and extrinsics in each historical block.
For popular chains, one can use an already in-sync publicly available Indexer endpoint. For other chains, a self-hosted should be set up.
: Codegen tools to set up and run a Hydra pipeline
: Hydra indexer for ingesting raw events and extrinsics
: GraphQL interface for the Indexer
: Processing part of the pipeline for transforming events into rich business-level objects
: A tool for generating typesafe typescript classes for events and extrinsics from the runtime metadata. No more manual deserialization of the event data.
: A quickstart Hydra project set up against a publicly available Kusama indexer. Good starting point.
: In-depth documentation covering the Hydra pipeline and API features, such as full-text search, pagination, extensive filtering and a rich GraphQL dialect defining your schema!
