0g-chain/x/cdp/keeper/querier.go
2019-11-25 14:46:02 -05:00

84 lines
2.7 KiB
Go

package keeper
import (
"fmt"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/kava-labs/kava/x/cdp/types"
)
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 types.QueryGetCdps:
return queryGetCdps(ctx, req, keeper)
case types.QueryGetParams:
return queryGetParams(ctx, req, keeper)
default:
return nil, sdk.ErrUnknownRequest("unknown cdp query endpoint")
}
}
}
// queryGetCdps fetches CDPs, optionally filtering by any of the query params (in QueryCdpsParams).
// While CDPs do not have an ID, this method can be used to get one CDP by specifying the collateral and owner.
func queryGetCdps(ctx sdk.Context, req abci.RequestQuery, keeper Keeper) ([]byte, sdk.Error) {
// Decode request
var requestParams types.QueryCdpsParams
err := keeper.cdc.UnmarshalJSON(req.Data, &requestParams)
if err != nil {
return nil, sdk.ErrInternal(fmt.Sprintf("failed to parse params: %s", err))
}
// Get CDPs
var cdps types.CDPs
if len(requestParams.Owner) != 0 {
if len(requestParams.CollateralDenom) != 0 {
// owner and collateral specified - get a single CDP
cdp, found := keeper.GetCDP(ctx, requestParams.Owner, requestParams.CollateralDenom)
if !found {
cdp = types.CDP{Owner: requestParams.Owner, CollateralDenom: requestParams.CollateralDenom, CollateralAmount: sdk.ZeroInt(), Debt: sdk.ZeroInt()}
}
cdps = types.CDPs{cdp}
} else {
// owner, but no collateral specified - get all CDPs for one address
return nil, sdk.ErrInternal("getting all CDPs belonging to one owner not implemented")
}
} else {
// owner not specified -- get all CDPs or all CDPs of one collateral type, optionally filtered by price
var errSdk sdk.Error // := doesn't work here
cdps, errSdk = keeper.GetCDPs(ctx, requestParams.CollateralDenom, requestParams.UnderCollateralizedAt)
if errSdk != nil {
return nil, errSdk
}
}
// Encode results
bz, err := codec.MarshalJSONIndent(keeper.cdc, cdps)
if err != nil {
return nil, sdk.ErrInternal(sdk.AppendMsgToErr("could not marshal result to JSON", err.Error()))
}
return bz, nil
}
// queryGetParams fetches the cdp module parameters
// TODO does this need to exist? Can you use cliCtx.QueryStore instead?
func queryGetParams(ctx sdk.Context, req abci.RequestQuery, keeper Keeper) ([]byte, sdk.Error) {
// Get params
params := keeper.GetParams(ctx)
// Encode results
bz, err := codec.MarshalJSONIndent(keeper.cdc, params)
if err != nil {
return nil, sdk.ErrInternal(sdk.AppendMsgToErr("could not marshal result to JSON", err.Error()))
}
return bz, nil
}