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get_keys.go
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/
get_keys.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package state
import (
"github.com/centrifuge/go-substrate-rpc-client/client"
"github.com/centrifuge/go-substrate-rpc-client/types"
)
// GetKeys retreives the keys with the given prefix
func (s *State) GetKeys(prefix types.StorageKey, blockHash types.Hash) ([]types.StorageKey, error) {
return s.getKeys(prefix, &blockHash)
}
// GetKeysLatest retreives the keys with the given prefix for the latest block height
func (s *State) GetKeysLatest(prefix types.StorageKey) ([]types.StorageKey, error) {
return s.getKeys(prefix, nil)
}
func (s *State) getKeys(prefix types.StorageKey, blockHash *types.Hash) ([]types.StorageKey, error) {
var res []string
err := client.CallWithBlockHash(s.client, &res, "state_getKeys", blockHash, prefix.Hex())
if err != nil {
return nil, err
}
keys := make([]types.StorageKey, len(res))
for i, r := range res {
err = types.DecodeFromHexString(r, &keys[i])
if err != nil {
return nil, err
}
}
return keys, err
}