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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/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
greeter "github.com/cosmos/sdk-tutorials/hellochain/x/greeter/internal/types"
)
// query endpoints supported by the hellochain Querier
const (
ListGreetings = "list"
)
// 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 error) {
switch path[0] {
case ListGreetings:
return listGreetings(ctx, path[1:], req, keeper)
default:
return nil, sdkerrors.Wrap(sdkerrors.ErrUnknownRequest, "unknown greeter query endpoint")
}
}
}
func listGreetings(ctx sdk.Context, params []string, req abci.RequestQuery, keeper Keeper) ([]byte, error) {
greetingList := greeter.NewQueryResGreetings()
iterator := keeper.GetGreetingsIterator(ctx)
addr, err := sdk.AccAddressFromBech32(params[0])
if err != nil {
return nil, err
}
for ; iterator.Valid(); iterator.Next() {
var greeting greeter.Greeting
keeper.cdc.MustUnmarshalBinaryBare(iterator.Value(), &greeting)
if greeting.Recipient.Equals(addr) {
greetingList[addr.String()] = append(greetingList[addr.String()], greeting)
}
}
hellos, err := codec.MarshalJSONIndent(keeper.cdc, greetingList)
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
}
return hellos, nil
}