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 }