EVM
Substreams allows you to easily extract data from the the Solana blockchain. With Substreams, you can retrieve transactions, instructions or accounts, taking advantage of its powerful streaming technology. It's super fast!
Getting Started
There are two main concepts in Substreams: packages and modules. Essentially, a module is a Rust function that contains definitions to extract data from the blockchain. Modules are grouped in packages, which are binary files (.spkg) that contain one or several modules. For example, you might have a package called ethereum-common, which has two modules: get_transactions and get_events.
Developing a Substreams module requires some knowledge of Rust, but the code-generation tools provided by the Substreams CLI make it so easy to bootstrap a Substreams project.
To consume Ethereum data with The Graph you have two options:
- Substreams-powered Subgraphs: you import a Substreams module into the subgraph. Essentially, Substreams acts just as the extraction layer, but the business logic lives in the subgraph. The Substreams only provides raw data (you use AssemblyScript to code your subgraph).
- Substreams directly: you develop your own Substreams module (you use Rust to code your Substreams). Then, you can choose how to consume the data (SQL, Prometheus, streaming...).
Choosing one over the other is up to you. Consider the needs of your application and the skills needed to develop.
Tip: If you do not know what subgraphs are, please take a look at The Graph documentation.
To get started, start auto-generating your Substreams using the substreams init command:
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