github.com/stafiprotocol/go-substrate-rpc-client@v1.4.7/rpc/state/get_metadata.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  // GetMetadata returns the metadata at the given block
    25  func (s *State) GetMetadata(blockHash types.Hash) (*types.Metadata, error) {
    26  	return s.getMetadata(&blockHash)
    27  }
    28  
    29  // GetMetadataLatest returns the latest metadata
    30  func (s *State) GetMetadataLatest() (*types.Metadata, error) {
    31  	return s.getMetadata(nil)
    32  }
    33  
    34  func (s *State) getMetadata(blockHash *types.Hash) (*types.Metadata, error) {
    35  	var res string
    36  	err := client.CallWithBlockHash(s.client, &res, "state_getMetadata", blockHash)
    37  	if err != nil {
    38  		return nil, err
    39  	}
    40  
    41  	var metadata types.Metadata
    42  	err = types.DecodeFromHexString(res, &metadata)
    43  	return &metadata, err
    44  }