---
title: Oracle review
tags: Oracle
status: Draft
---
# Oracle review

## Things to research

- Gas estimation.
- Gas amount depends on previous reports (contract state)?
- Report structure
- Static array length
- Dynamic array length depends on gas amount
- How extra data quorum works.
- What if there are several parts of extra data with same type.
- Separate modules into processes.
- Версия Оракула прибита к версии контракта. Для апдейта - нужно выкатить мажорную верию и попросить Oracle Holders параллельно поднять её.

## Entrypoint same for all modules

Responsobility:
- Variables sainity checks.
- Infinity cycle
- All healthchecks

## Accounting

Cycle:
- Check contract and consensus version
- Oracle state:
- Ready for hash report
- Build report.
- Send hash to Contract
- Ready for data to be reported
- Build report.
- Check hash with Oracle's contract if changed send new hash.
- If consensus hash == oracle's hash - send report data
- Ready for list of validators to be reported (WIP)
- Oracle finalized and all data delivered. Wait for next epoch.

### Calculations

- Bunker mode.
- How to associate lido slashed validators to withdrawal requests, beacuse slashed epoch can't be calculated
`withdraw = max(validator.withdrawable_epoch, Epoch(epoch + EPOCHS_PER_SLASHINGS_VECTOR))`

## Ejectior

Cycle:
- Check contract and consensus version
- Oracle state:
- Ready for hash report
- Build report.
- Send hash to Contract
- Ready for data to be reported
- Build report.
- Check hash with Oracle's contract if changed send new hash.
- If consensus hash == oracle's hash - send report data
- Oracle finalized and all data delivered. Wait for next epoch.

## Price balancer

Move to separate daemon.

- Согласовать с протокольной командой
- Write bot
- Test bot
- Deploy smart contracts on testnet
- Deploy testnet
- Ask devops for capacity
- Deploy prod
- Build dashboard and alerts

Source: https://github.com/lidofinance/lido-oracle/blob/ae034e3dfe8c98c66d9fbfa88a097c6fe1a75b99/src/modules/steth_price_balancer.py