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historical.go
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/
historical.go
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package grpc
import (
"errors"
"strings"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/rs/zerolog"
"github.com/umee-network/umee/v6/client"
)
// MedianCheck waits for availability of all exchange rates from the denom accept list,
// records historical stamp data based on the oracle params, computes the
// median/median deviation and then compares that to the data in the
// median/median deviation gRPC query
func MedianCheck(umee client.Client) error {
ctx, cancel := umee.NewQCtxWithCancel()
defer cancel()
params, err := umee.QueryOracleParams()
if err != nil {
return err
}
denomAcceptList := []string{}
for _, acceptItem := range params.AcceptList {
denomAcceptList = append(denomAcceptList, strings.ToUpper(acceptItem.SymbolDenom))
}
chainHeight, err := umee.NewChainHeightListener(ctx, zerolog.Nop())
if err != nil {
return err
}
var exchangeRates sdk.DecCoins
for i := 0; i < 20; i++ {
exchangeRates, err = umee.QueryExchangeRates()
if err == nil && len(exchangeRates) == len(denomAcceptList) {
break
}
<-chainHeight.HeightChanged
}
// error if the loop above didn't succeed
if err != nil {
return err
}
if len(exchangeRates) != len(denomAcceptList) {
return errors.New("couldn't fetch exchange rates matching denom accept list")
}
priceStore, err := listenForPrices(umee, params, chainHeight)
if err != nil {
return err
}
err = priceStore.checkMedians()
if err != nil {
return err
}
err = priceStore.checkMedianDeviations()
if err != nil {
return err
}
return nil
}