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get_storage.go
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get_storage.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/leesmet/go-substrate-rpc-client/client"
"github.com/leesmet/go-substrate-rpc-client/types"
)
// GetStorage retreives the stored data and decodes them into the provided interface. Ok is true if the value is not
// empty.
func (s *State) GetStorage(key types.StorageKey, target interface{}, blockHash types.Hash) (ok bool, err error) {
raw, err := s.getStorageRaw(key, &blockHash)
if err != nil {
return false, err
}
if len(*raw) == 0 {
return false, nil
}
return true, types.DecodeFromBytes(*raw, target)
}
// GetStorageLatest retreives the stored data for the latest block height and decodes them into the provided interface.
// Ok is true if the value is not empty.
func (s *State) GetStorageLatest(key types.StorageKey, target interface{}) (ok bool, err error) {
raw, err := s.getStorageRaw(key, nil)
if err != nil {
return false, err
}
if len(*raw) == 0 {
return false, nil
}
return true, types.DecodeFromBytes(*raw, target)
}
// GetStorageRaw retreives the stored data as raw bytes, without decoding them
func (s *State) GetStorageRaw(key types.StorageKey, blockHash types.Hash) (*types.StorageDataRaw, error) {
return s.getStorageRaw(key, &blockHash)
}
// GetStorageRawLatest retreives the stored data for the latest block height as raw bytes, without decoding them
func (s *State) GetStorageRawLatest(key types.StorageKey) (*types.StorageDataRaw, error) {
return s.getStorageRaw(key, nil)
}
func (s *State) getStorageRaw(key types.StorageKey, blockHash *types.Hash) (*types.StorageDataRaw, error) {
var res string
err := client.CallWithBlockHash(s.client, &res, "state_getStorage", blockHash, key.Hex())
if err != nil {
return nil, err
}
bz, err := types.HexDecodeString(res)
if err != nil {
return nil, err
}
data := types.NewStorageDataRaw(bz)
return &data, nil
}