/
querier.go
77 lines (61 loc) · 2 KB
/
querier.go
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package keeper
import (
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/sdk-application-tutorial/x/nameservice/internal/types"
sdk "github.com/cosmos/cosmos-sdk/types"
abci "github.com/tendermint/tendermint/abci/types"
)
// query endpoints supported by the nameservice Querier
const (
QueryResolve = "resolve"
QueryWhois = "whois"
QueryNames = "names"
)
// 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 QueryResolve:
return queryResolve(ctx, path[1:], req, keeper)
case QueryWhois:
return queryWhois(ctx, path[1:], req, keeper)
case QueryNames:
return queryNames(ctx, req, keeper)
default:
return nil, sdk.ErrUnknownRequest("unknown nameservice query endpoint")
}
}
}
// nolint: unparam
func queryResolve(ctx sdk.Context, path []string, req abci.RequestQuery, keeper Keeper) ([]byte, sdk.Error) {
value := keeper.ResolveName(ctx, path[0])
if value == "" {
return []byte{}, sdk.ErrUnknownRequest("could not resolve name")
}
res, err := codec.MarshalJSONIndent(keeper.cdc, types.QueryResResolve{Value: value})
if err != nil {
panic("could not marshal result to JSON")
}
return res, nil
}
// nolint: unparam
func queryWhois(ctx sdk.Context, path []string, req abci.RequestQuery, keeper Keeper) ([]byte, sdk.Error) {
whois := keeper.GetWhois(ctx, path[0])
res, err := codec.MarshalJSONIndent(keeper.cdc, whois)
if err != nil {
panic("could not marshal result to JSON")
}
return res, nil
}
func queryNames(ctx sdk.Context, req abci.RequestQuery, keeper Keeper) ([]byte, sdk.Error) {
var namesList types.QueryResNames
iterator := keeper.GetNamesIterator(ctx)
for ; iterator.Valid(); iterator.Next() {
namesList = append(namesList, string(iterator.Key()))
}
res, err := codec.MarshalJSONIndent(keeper.cdc, namesList)
if err != nil {
panic("could not marshal result to JSON")
}
return res, nil
}