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querier.go
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querier.go
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package keeper
import (
abci "github.com/tendermint/tendermint/abci/types"
"github.com/enigmampc/cosmos-sdk/client"
sdk "github.com/enigmampc/cosmos-sdk/types"
sdkerrors "github.com/enigmampc/cosmos-sdk/types/errors"
"github.com/enigmampc/cosmos-sdk/x/supply/internal/types"
)
// NewQuerier creates a querier for supply REST endpoints
func NewQuerier(k Keeper) sdk.Querier {
return func(ctx sdk.Context, path []string, req abci.RequestQuery) ([]byte, error) {
switch path[0] {
case types.QueryTotalSupply:
return queryTotalSupply(ctx, req, k)
case types.QuerySupplyOf:
return querySupplyOf(ctx, req, k)
default:
return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unknown %s query endpoint: %s", types.ModuleName, path[0])
}
}
}
func queryTotalSupply(ctx sdk.Context, req abci.RequestQuery, k Keeper) ([]byte, error) {
var params types.QueryTotalSupplyParams
err := types.ModuleCdc.UnmarshalJSON(req.Data, ¶ms)
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONUnmarshal, err.Error())
}
totalSupply := k.GetSupply(ctx).GetTotal()
start, end := client.Paginate(len(totalSupply), params.Page, params.Limit, 100)
if start < 0 || end < 0 {
totalSupply = sdk.Coins{}
} else {
totalSupply = totalSupply[start:end]
}
res, err := totalSupply.MarshalJSON()
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
}
return res, nil
}
func querySupplyOf(ctx sdk.Context, req abci.RequestQuery, k Keeper) ([]byte, error) {
var params types.QuerySupplyOfParams
err := types.ModuleCdc.UnmarshalJSON(req.Data, ¶ms)
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONUnmarshal, err.Error())
}
supply := k.GetSupply(ctx).GetTotal().AmountOf(params.Denom)
res, err := supply.MarshalJSON()
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
}
return res, nil
}