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header.go
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/
header.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 types
import (
"encoding/json"
"math/big"
"strconv"
"strings"
"github.com/centrifuge/go-substrate-rpc-client/scale"
)
type Header struct {
ParentHash Hash `json:"parentHash"`
Number BlockNumber `json:"number"`
StateRoot Hash `json:"stateRoot"`
ExtrinsicsRoot Hash `json:"extrinsicsRoot"`
Digest Digest `json:"digest"`
}
type BlockNumber U32
// UnmarshalJSON fills BlockNumber with the JSON encoded byte array given by bz
func (b *BlockNumber) UnmarshalJSON(bz []byte) error {
var tmp string
if err := json.Unmarshal(bz, &tmp); err != nil {
return err
}
s := strings.TrimPrefix(tmp, "0x")
p, err := strconv.ParseUint(s, 16, 32)
*b = BlockNumber(p)
return err
}
// MarshalJSON returns a JSON encoded byte array of BlockNumber
func (b BlockNumber) MarshalJSON() ([]byte, error) {
s := strconv.FormatUint(uint64(b), 16)
return json.Marshal(s)
}
// Encode implements encoding for BlockNumber, which just unwraps the bytes of BlockNumber
func (b BlockNumber) Encode(encoder scale.Encoder) error {
return encoder.EncodeUintCompact(*big.NewInt(0).SetUint64(uint64(b)))
}
// Decode implements decoding for BlockNumber, which just wraps the bytes in BlockNumber
func (b *BlockNumber) Decode(decoder scale.Decoder) error {
u, err := decoder.DecodeUintCompact()
if err != nil {
return err
}
*b = BlockNumber(u.Uint64())
return err
}