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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"
"github.com/cosmos/sdk-tutorials/scavenge/x/scavenge/types"
)
// NewQuerier creates a new querier for scavenge clients.
func NewQuerier(k Keeper) sdk.Querier {
return func(ctx sdk.Context, path []string, req abci.RequestQuery) ([]byte, error) {
switch path[0] {
case types.QueryListScavenges:
return listScavenges(ctx, k)
case types.QueryGetScavenge:
return getScavenge(ctx, path[1:], k)
case types.QueryCommit:
return getCommit(ctx, path[1:], k)
default:
return nil, sdkerrors.Wrap(sdkerrors.ErrUnknownRequest, "unknown scavenge query endpoint")
}
}
}
// RemovePrefixFromHash removes the prefix from the key
func RemovePrefixFromHash(key []byte, prefix []byte) (hash []byte) {
hash = key[len(prefix):]
return hash
}
func listScavenges(ctx sdk.Context, k Keeper) ([]byte, error) {
var scavengeList types.QueryResScavenges
iterator := k.GetScavengesIterator(ctx)
for ; iterator.Valid(); iterator.Next() {
scavengeHash := RemovePrefixFromHash(iterator.Key(), []byte(types.ScavengePrefix))
scavengeList = append(scavengeList, string(scavengeHash))
}
res, err := codec.MarshalJSONIndent(k.cdc, scavengeList)
if err != nil {
return res, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
}
return res, nil
}
func getScavenge(ctx sdk.Context, path []string, k Keeper) (res []byte, sdkError error) {
solutionHash := path[0]
scavenge, err := k.GetScavenge(ctx, solutionHash)
if err != nil {
return nil, err
}
res, err = codec.MarshalJSONIndent(k.cdc, scavenge)
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
}
return res, nil
}
func getCommit(ctx sdk.Context, path []string, k Keeper) (res []byte, sdkError error) {
solutionScavengerHash := path[0]
commit, err := k.GetCommit(ctx, solutionScavengerHash)
if err != nil {
return nil, err
}
res, err = codec.MarshalJSONIndent(k.cdc, commit)
if err != nil {
return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
}
return res, nil
}