76 lines
1.8 KiB
Go
76 lines
1.8 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/core/blockchainer"
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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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// Header wrapper used for the representation of
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// block header on the RPC Server.
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Header struct {
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block.Header
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BlockMetadata
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}
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)
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// NewHeader creates a new Header wrapper.
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func NewHeader(h *block.Header, chain blockchainer.Blockchainer) Header {
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res := Header{
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Header: *h,
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BlockMetadata: BlockMetadata{
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Size: io.GetVarSize(h),
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Confirmations: chain.BlockHeight() - h.Index + 1,
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},
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}
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hash := chain.GetHeaderHash(int(h.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 json.Marshaler interface.
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func (h Header) MarshalJSON() ([]byte, error) {
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output, err := json.Marshal(h.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(h.Header)
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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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// 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 json.Unmarshaler interface.
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func (h *Header) 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, &h.Header)
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if err != nil {
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return err
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}
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h.BlockMetadata = *meta
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return nil
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}
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