0g-chain/x/pricefeed/spec/02_state.md

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2020-05-07 15:11:10 +00:00
# State
## Parameters and genesis state
`Paramaters` determine which markets are tracked by the pricefeed and which oracles are authorized to post prices for a given market. There is only one active parameter set at any given time. Updates to parameters can be made via on-chain parameter update proposals.
```go
// Params params for pricefeed. Can be altered via governance
type Params struct {
Markets Markets `json:"markets" yaml:"markets"` // Array containing the markets supported by the pricefeed
}
// Market an asset in the pricefeed
type Market struct {
MarketID string `json:"market_id" yaml:"market_id"`
BaseAsset string `json:"base_asset" yaml:"base_asset"`
QuoteAsset string `json:"quote_asset" yaml:"quote_asset"`
Oracles []sdk.AccAddress `json:"oracles" yaml:"oracles"`
Active bool `json:"active" yaml:"active"`
}
type Markets []Market
```
`GenesisState` defines the state that must be persisted when the blockchain stops/stars in order for the normal function of the pricefeed to resume.
```go
// GenesisState - pricefeed state that must be provided at genesis
type GenesisState struct {
Params Params `json:"params" yaml:"params"`
PostedPrices []PostedPrice `json:"posted_prices" yaml:"posted_prices"`
}
// PostedPrice price for market posted by a specific oracle
type PostedPrice struct {
MarketID string `json:"market_id" yaml:"market_id"`
OracleAddress sdk.AccAddress `json:"oracle_address" yaml:"oracle_address"`
Price sdk.Dec `json:"price" yaml:"price"`
Expiry time.Time `json:"expiry" yaml:"expiry"`
}
type PostedPrices []PostedPrice
```