0g-chain/x/pricefeed/querier.go

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2019-11-25 19:46:02 +00:00
package pricefeed
import (
"github.com/cosmos/cosmos-sdk/codec"
abci "github.com/tendermint/tendermint/abci/types"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// NewQuerier is the module level router for state queries
func NewQuerier(keeper Keeper) sdk.Querier {
return func(ctx sdk.Context, path []string, req abci.RequestQuery) (res []byte, err sdk.Error) {
switch path[0] {
case QueryCurrentPrice:
return queryCurrentPrice(ctx, path[1:], req, keeper)
case QueryRawPrices:
return queryRawPrices(ctx, path[1:], req, keeper)
case QueryAssets:
return queryAssets(ctx, req, keeper)
default:
return nil, sdk.ErrUnknownRequest("unknown pricefeed query endpoint")
}
}
}
func queryCurrentPrice(ctx sdk.Context, path []string, req abci.RequestQuery, keeper Keeper) (res []byte, err sdk.Error) {
assetCode := path[0]
_, found := keeper.GetAsset(ctx, assetCode)
if !found {
return []byte{}, sdk.ErrUnknownRequest("asset not found")
}
currentPrice := keeper.GetCurrentPrice(ctx, assetCode)
bz, err2 := codec.MarshalJSONIndent(keeper.cdc, currentPrice)
if err2 != nil {
panic("could not marshal result to JSON")
}
return bz, nil
}
func queryRawPrices(ctx sdk.Context, path []string, req abci.RequestQuery, keeper Keeper) (res []byte, err sdk.Error) {
var priceList QueryRawPricesResp
assetCode := path[0]
_, found := keeper.GetAsset(ctx, assetCode)
if !found {
return []byte{}, sdk.ErrUnknownRequest("asset not found")
}
rawPrices := keeper.GetRawPrices(ctx, assetCode)
for _, price := range rawPrices {
priceList = append(priceList, price.String())
}
bz, err2 := codec.MarshalJSONIndent(keeper.cdc, priceList)
if err2 != nil {
panic("could not marshal result to JSON")
}
return bz, nil
}
func queryAssets(ctx sdk.Context, req abci.RequestQuery, keeper Keeper) (res []byte, err sdk.Error) {
var assetList QueryAssetsResp
assets := keeper.GetAssets(ctx)
for _, asset := range assets {
assetList = append(assetList, asset.String())
}
bz, err2 := codec.MarshalJSONIndent(keeper.cdc, assetList)
if err2 != nil {
panic("could not marshal result to JSON")
}
return bz, nil
}