| description |
|---|
StreamingFast Firehose reader component |
The Reader component is responsible for extracting data from instrumented blockchain nodes.
The Reader component utilizes the StreamingFast node-manager library to run a blockchain node instance as a sub-process. Alternatively, the Reader component can consume the stdout of the process where reader-stdin is implemented.
Once the process has been started, the Reader component:
- reads the data being generated by the node,
- forwards the data downstream to other connected components including the Relayer, Firehose gRPC Server, etc.
- flushes the data to Object Storage for durability, and for the Merger to pick up the data.
The data consumed by Firehose is provided by the Reader component.
{% hint style="success" %} Tip: The Reader component is the initial and deterministic data producer for Firehose and all of its components. {% endhint %}
The Blockchain node underlying and managed by the Reader can be considered simplistic. They don't have archiving capabilities or any additional features.
{% hint style="info" %} Note: after Firehose has been instrumented on a node it will begin returning substantial amounts of data. {% endhint %}