neoneo-go/pkg/rpc/response/result/block_header.go

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package result
import (
"encoding/json"
"errors"
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
)
type (
// Header wrapper used for the representation of
// block header on the RPC Server.
Header struct {
block.Header
BlockMetadata
}
)
// NewHeader creates a new Header wrapper.
func NewHeader(h *block.Header, chain blockchainer.Blockchainer) Header {
res := Header{
Header: *h,
BlockMetadata: BlockMetadata{
Size: io.GetVarSize(h),
Confirmations: chain.BlockHeight() - h.Index + 1,
},
}
hash := chain.GetHeaderHash(int(h.Index) + 1)
if !hash.Equals(util.Uint256{}) {
res.NextBlockHash = &hash
}
return res
}
// MarshalJSON implements json.Marshaler interface.
func (h Header) MarshalJSON() ([]byte, error) {
output, err := json.Marshal(h.BlockMetadata)
if err != nil {
return nil, err
}
baseBytes, err := json.Marshal(h.Header)
if err != nil {
return nil, err
}
// We have to keep both "fields" at the same level in json in order to
// match C# API, so there's no way to marshall Block correctly with
// standard json.Marshaller tool.
if output[len(output)-1] != '}' || baseBytes[0] != '{' {
return nil, errors.New("can't merge internal jsons")
}
output[len(output)-1] = ','
output = append(output, baseBytes[1:]...)
return output, nil
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (h *Header) UnmarshalJSON(data []byte) error {
// As block.Block and BlockMetadata are at the same level in json,
// do unmarshalling separately for both structs.
meta := new(BlockMetadata)
err := json.Unmarshal(data, meta)
if err != nil {
return err
}
err = json.Unmarshal(data, &h.Header)
if err != nil {
return err
}
h.BlockMetadata = *meta
return nil
}