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Python Library to connect to the NEAR Lake S3 and stream the data

Project description

NEAR Lake Framework for Python

Available in programming languages: Rust | Javascript | Python3

NEAR Lake Framework is a small library companion to NEAR Lake. It allows you to build your own indexer that subscribes to the stream of blocks from the NEAR Lake data source and create your own logic to process the NEAR Protocol data.

PyPI version MIT or Apache 2.0 licensed

Official NEAR Lake Framework launch announcement has been published on the NEAR Gov Forum Greetings from the Data Platform Team! We are happy and proud to announce an MVP release of a brand new word in indexer building approach - NEAR Lake Framework.


import asyncio
import os

from near_lake_framework import LakeConfig, streamer

async def main():
    config = LakeConfig.mainnet()
    config.start_block_height = 69130938
    config.aws_access_key_id = os.getenv("AWS_ACCESS_KEY_ID")
    config.aws_secret_key = os.getenv("AWS_SECRET_ACCESS_KEY")

    stream_handle, streamer_messages_queue = streamer(config)
    while True:
        streamer_message = await streamer_messages_queue.get()
            f"Received Block #{streamer_message.block.header.height} from Lake Framework"

loop = asyncio.get_event_loop()

How to use


Install near-lake-framework

$ pip3 install near-lake-framework


To be able to access the data from NEAR Lake you need to provide credentials. Please, see the Credentials article


Everything should be configured before the start of your indexer application via LakeConfig struct.

Available parameters:

  • s3_bucket_name: str - provide the AWS S3 bucket name (near-lake-testnet, near-lake-mainnet or yours if you run your own NEAR Lake)
  • s3_region_name: str - provide the region for AWS S3 bucket
  • start_block_height: BlockHeight - block height to start the stream from
  • blocks_preload_pool_size: int - provide the number of blocks to preload (default: 200)

Cost estimates

TL;DR approximately $18.15 per month (for AWS S3 access, paid directly to AWS) for the reading of fresh blocks


Assuming NEAR Protocol produces accurately 1 block per second (which is really not, the average block production time is 1.3s). A full day consists of 86400 seconds, that's the max number of blocks that can be produced.

According the Amazon S3 prices list requests are charged for $0.005 per 1000 requests and get is charged for $0.0004 per 1000 requests.

Calculations (assuming we are following the tip of the network all the time):

86400 blocks per day * 5 requests for each block / 1000 requests * $0.0004 per 1k requests = $0.173 * 30 days = $5.19

Note: 5 requests for each block means we have 4 shards (1 file for common block data and 4 separate files for each shard)

And a number of list requests we need to perform for 30 days:

86400 blocks per day / 1000 requests * $0.005 per 1k list requests = $0.432 * 30 days = $12.96

$5.19 + $12.96 = $18.15

The price depends on the number of shards

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