github.com/stafiprotocol/go-substrate-rpc-client@v1.4.7/rpc/state/query_storage.go (about)

     1  // Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
     2  //
     3  // Copyright 2020 Stafi Protocol
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  
    17  package state
    18  
    19  import (
    20  	"github.com/stafiprotocol/go-substrate-rpc-client/pkg/client"
    21  	"github.com/stafiprotocol/go-substrate-rpc-client/types"
    22  )
    23  
    24  // QueryStorage queries historical storage entries (by key) starting from a start block until an end block
    25  func (s *State) QueryStorage(keys []types.StorageKey, startBlock types.Hash, block types.Hash) (
    26  	[]types.StorageChangeSet, error) {
    27  	return s.queryStorage(keys, startBlock, &block)
    28  }
    29  
    30  // QueryStorageLatest queries historical storage entries (by key) starting from a start block until the latest block
    31  func (s *State) QueryStorageLatest(keys []types.StorageKey, startBlock types.Hash) ([]types.StorageChangeSet, error) {
    32  	return s.queryStorage(keys, startBlock, nil)
    33  }
    34  
    35  func (s *State) queryStorage(keys []types.StorageKey, startBlock types.Hash, block *types.Hash) (
    36  	[]types.StorageChangeSet, error) {
    37  	hexKeys := make([]string, len(keys))
    38  	for i, key := range keys {
    39  		hexKeys[i] = key.Hex()
    40  	}
    41  
    42  	var res []types.StorageChangeSet
    43  	err := client.CallWithBlockHash(s.client, &res, "state_queryStorage", block, hexKeys, startBlock.Hex())
    44  	if err != nil {
    45  		return nil, err
    46  	}
    47  
    48  	return res, nil
    49  }