neoneo-go/pkg/rpc/response/result/block.go
Roman Khimov 7633439845 rpc/block: rework the way Block is JSONized
Our block.Block was JSONized in a bit different fashion than result.Block in
its NextConsensus and Index fields. It's not good for notifications because
third-party clients would probably expect to see the same format. Also, using
completely different Block representation is probably making our client a bit
weaker as this representation is harder to use with other neo-go components.

So use the same approach we took for Transactions and wrap block.Block which is
to be serialized in proper way.

Fix `Script` JSONization along the way, 3.0 node wraps it within `witnesses`.
2020-05-26 11:36:47 +03:00

87 lines
2.1 KiB
Go

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 (
// Block wrapper used for the representation of
// block.Block / block.Base on the RPC Server.
Block struct {
*block.Block
BlockMetadata
}
// BlockMetadata is an additional metadata added to standard
// block.Block.
BlockMetadata struct {
Size int `json:"size"`
NextBlockHash *util.Uint256 `json:"nextblockhash,omitempty"`
Confirmations uint32 `json:"confirmations"`
}
)
// NewBlock creates a new Block wrapper.
func NewBlock(b *block.Block, chain blockchainer.Blockchainer) Block {
res := Block{
Block: b,
BlockMetadata: BlockMetadata{
Size: io.GetVarSize(b),
Confirmations: chain.BlockHeight() - b.Index - 1,
},
}
hash := chain.GetHeaderHash(int(b.Index) + 1)
if !hash.Equals(util.Uint256{}) {
res.NextBlockHash = &hash
}
return res
}
// MarshalJSON implements json.Marshaler interface.
func (b Block) MarshalJSON() ([]byte, error) {
output, err := json.Marshal(b.BlockMetadata)
if err != nil {
return nil, err
}
baseBytes, err := json.Marshal(b.Block)
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 (b *Block) 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)
base := new(block.Block)
err := json.Unmarshal(data, meta)
if err != nil {
return err
}
err = json.Unmarshal(data, base)
if err != nil {
return err
}
b.Block = base
b.BlockMetadata = *meta
return nil
}