ethlog_example

Fetch logs from Ethereum-like network such as: Etherenum, Binance Smart Chain.
Fetching is sequence, from a block number to the present and keep getting logs from new blocks. It continues running from latest block after shutdown or restarting.
Do simple data processing and save it to database.
Provide a HTTP API for retrieving data.
Support two layers of Ethereum endpoints: main and backup.
Support load balancing and health checking between endpoints in a layer.
See Documents for more details.

Warning and Notes

Do not run more than an instance. Since this is all-in-one service, multi instances mean multi workers, it stresses Ethereum endpoints and causes incorrect data too. In production, consider to separate API and worker service.
Etherenum RPC is bad in term of data accuracy and consistency. Unfortunately, there is no guarantee to avoid it, although there are many efforts is apply to reduce it.
Use dedicated Etherenum endpoint for critial applications. For example: NFT statistic. Dedicate Ethereum endpoint mean requests to RPC go to Ethereum node directly, without middleware routing.