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package types
import (
"bytes"
"errors"
"fmt"
tmproto "github.com/tendermint/tendermint/proto/types"
)
// BlockMeta contains meta information.
type BlockMeta struct {
BlockID BlockID `json:"block_id"`
BlockSize int `json:"block_size"`
Header Header `json:"header"`
NumTxs int `json:"num_txs"`
}
// NewBlockMeta returns a new BlockMeta.
func NewBlockMeta(block *Block, blockParts *PartSet) *BlockMeta {
return &BlockMeta{
BlockID: BlockID{block.Hash(), blockParts.Header()},
BlockSize: block.Size(),
Header: block.Header,
NumTxs: len(block.Data.Txs),
}
}
func (bm *BlockMeta) ToProto() *tmproto.BlockMeta {
if bm == nil {
return nil
}
pb := &tmproto.BlockMeta{
BlockID: bm.BlockID.ToProto(),
BlockSize: int64(bm.BlockSize),
Header: *bm.Header.ToProto(),
NumTxs: int64(bm.NumTxs),
}
return pb
}
func BlockMetaFromProto(pb *tmproto.BlockMeta) (*BlockMeta, error) {
if pb == nil {
return nil, errors.New("blockmeta is empty")
}
bm := new(BlockMeta)
bi, err := BlockIDFromProto(&pb.BlockID)
if err != nil {
return nil, err
}
h, err := HeaderFromProto(&pb.Header)
if err != nil {
return nil, err
}
bm.BlockID = *bi
bm.BlockSize = int(pb.BlockSize)
bm.Header = h
bm.NumTxs = int(pb.NumTxs)
return bm, bm.ValidateBasic()
}
// ValidateBasic performs basic validation.
func (bm *BlockMeta) ValidateBasic() error {
if err := bm.BlockID.ValidateBasic(); err != nil {
return err
}
if !bytes.Equal(bm.BlockID.Hash, bm.Header.Hash()) {
return fmt.Errorf("expected BlockID#Hash and Header#Hash to be the same, got %X != %X",
bm.BlockID.Hash, bm.Header.Hash())
}
return nil
}