Oracle

Overview

Parallel oracle implement with orml-oracle , serval approved members can feed prices to on-chain oracle, and then aggregated on-chain.

Tip: follow the link for more info about orml-oracle.

Oracle Architecture

Prices Pallet

This pallet provides the price from Oracle Module by implementing thePriceFeeder trait. In case of emergency, the price can be set directly by Oracle Collective.

View Data Storage

EmergencyPrice

Mapping from currency id to it's emergency price

Code

pub type EmergencyPrice<T: Config> = StorageMap<_, Twox64Concat, CurrencyId, PriceWithDecimal, OptionQuery>;

View Method

EmergencyPrice::T::get(currency_id: &CurrencyId)
Self::emergency_price(currency_id: &CurrencyId)

Key Name	Type	Description
currency_id	CurrencyId	The currency's Id

Tip: Follow the link to know more about 'CurrencyId'.

View Methods

Set_price()

Set emergency price

pub fn set_price(origin: OriginFor<T>, currency_id: CurrencyId, price: PriceWithDecimal,) -> DispatchResultWithPostInfo

Name	Substrate Config	Runtime Type	Description
origin	T::Origin	RawOrigin	The account signed this transaction
currency_id	-	CurrencyId	The currency id price to be set
price	-	PriceWithDecimal	The price with decimal to be set

RETURN: Returns Ok() when set_price succeeds, otherwise return a substrate error type.

Tip: Follow the link to know more about 'PriceWithDecimal'.

Reset_price()

Reset emergency price

pub fn reset_price(origin: OriginFor<T>, currency_id: CurrencyId,) -> DispatchResultWithPostInfo

Name	Substrate Config	Runtime Type	Description
origin	T::Origin	RawOrigin	The account signed this transaction
currency_id	-	CurrencyId	The currency id price to be set

RETURN: Returns Ok() when reset_price succeeds, otherwise return a substrate error type.

View Event

SetPrice

Set emergency price. [currency_id, price_detail]

SetPrice(CurrencyId, PriceWithDecimal)

ResetPrice

Reset emergency price. [currency_id]

ResetPrice(CurrencyId)