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Farcaster Indexer

This is an indexer that listens for messages from a Farcaster Hub and inserts relevant data into a postgres database.

The most performant way to run this is to co-locate everything (hub, node app, postgres, redis) on the same machine. I recommend Latitude (referral code for $200 of free credits).

How to run

Clone this repo

git clone -b hubs https://github.com/gskril/farcaster-indexer.git

Install dependencies

yarn install

Create a .env file with your hub, database, and redis connection details

cp .env.example .env

Run the latest database migrations

yarn kysely:migrate

Run the indexer

# Recommended to get the full state. You only need to run this once.
# Streaming will start after the backfill is complete.
yarn run backfill

# Ignores backfill and start streaming from the latest recorded event.
# You should run this after one initial backfill.
yarn start

How it works

  • Backfill and streaming are separate processes.
  • Every operation is run through BullMQ for better concurrency and error handling.
  • For backfill, the indexer adds all FIDs (in batches of 100) to a queue and processes them in parallel. The WORKER_CONCURRENCY environment variable controls how many workers are spawned.
  • Once backfill is complete, the indexer subscribes to a hub's event stream and processes messages as they arrive. BullMQ is used as middleware to ensure that hub events are getting handled fast enough, otherwise the stream will disconnect.

Extras

If you want to add search functionality, you can manually apply the SQL migration at src/db/search-migrations.sql