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89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
package result
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import (
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"encoding/json"
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"errors"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/util"
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)
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type (
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// LedgerAux is a set of methods needed to construct some outputs.
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LedgerAux interface {
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BlockHeight() uint32
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GetHeaderHash(int) util.Uint256
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}
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// Block wrapper used for the representation of
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// block.Block / block.Base on the RPC Server.
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Block struct {
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block.Block
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BlockMetadata
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}
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// BlockMetadata is an additional metadata added to the standard
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// block.Block.
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BlockMetadata struct {
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Size int `json:"size"`
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NextBlockHash *util.Uint256 `json:"nextblockhash,omitempty"`
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Confirmations uint32 `json:"confirmations"`
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}
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)
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// NewBlock creates a new Block wrapper.
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func NewBlock(b *block.Block, chain LedgerAux) Block {
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res := Block{
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Block: *b,
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BlockMetadata: BlockMetadata{
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Size: io.GetVarSize(b),
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Confirmations: chain.BlockHeight() - b.Index + 1,
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},
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}
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hash := chain.GetHeaderHash(int(b.Index) + 1)
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if !hash.Equals(util.Uint256{}) {
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res.NextBlockHash = &hash
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}
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return res
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}
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// MarshalJSON implements the json.Marshaler interface.
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func (b Block) MarshalJSON() ([]byte, error) {
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output, err := json.Marshal(b.BlockMetadata)
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if err != nil {
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return nil, err
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}
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baseBytes, err := json.Marshal(b.Block)
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if err != nil {
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return nil, err
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}
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// We have to keep both "fields" at the same level in json in order to
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// match C# API, so there's no way to marshall Block correctly with
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// the standard json.Marshaller tool.
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if output[len(output)-1] != '}' || baseBytes[0] != '{' {
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return nil, errors.New("can't merge internal jsons")
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}
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output[len(output)-1] = ','
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output = append(output, baseBytes[1:]...)
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return output, nil
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}
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// UnmarshalJSON implements the json.Unmarshaler interface.
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func (b *Block) UnmarshalJSON(data []byte) error {
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// As block.Block and BlockMetadata are at the same level in json,
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// do unmarshalling separately for both structs.
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meta := new(BlockMetadata)
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err := json.Unmarshal(data, meta)
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if err != nil {
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return err
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}
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err = json.Unmarshal(data, &b.Block)
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if err != nil {
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return err
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}
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b.BlockMetadata = *meta
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return nil
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}
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