github.com/diadata-org/diadata@v1.4.593/pkg/dia/helpers/substrate-helper/gsrpc/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 2019 Centrifuge GmbH
     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/diadata-org/diadata/pkg/dia/helpers/substrate-helper/gsrpc/client"
    21  	"github.com/diadata-org/diadata/pkg/dia/helpers/substrate-helper/gsrpc/types"
    22  	"github.com/diadata-org/diadata/pkg/dia/helpers/substrate-helper/gsrpc/types/codec"
    23  )
    24  
    25  // GetMetadata returns the metadata at the given block
    26  func (s *state) GetMetadata(blockHash types.Hash) (*types.Metadata, error) {
    27  	return s.getMetadata(&blockHash)
    28  }
    29  
    30  // GetMetadataLatest returns the latest metadata
    31  func (s *state) GetMetadataLatest() (*types.Metadata, error) {
    32  	return s.getMetadata(nil)
    33  }
    34  
    35  func (s *state) getMetadata(blockHash *types.Hash) (*types.Metadata, error) {
    36  	var res string
    37  	err := client.CallWithBlockHash(s.client, &res, "state_getMetadata", blockHash)
    38  	if err != nil {
    39  		return nil, err
    40  	}
    41  
    42  	var metadata types.Metadata
    43  	err = codec.DecodeFromHex(res, &metadata)
    44  	return &metadata, err
    45  }