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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus-core library is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
// TODO(jimmy-dexon): remove comments of NotaryAck before open source.
package types
import (
"bytes"
"fmt"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/crypto"
)
// Block represents a single event broadcasted on the network.
type Block struct {
ProposerID ValidatorID `json:"proposer_id"`
ParentHash common.Hash `json:"parent_hash"`
Hash common.Hash `json:"hash"`
Height uint64 `json:"height"`
Timestamps map[ValidatorID]time.Time `json:"timestamps"`
Acks map[common.Hash]struct{} `json:"acks"`
Signature crypto.Signature `json:"signature"`
Notary Notary `json:"notary"`
}
// Block implements BlockConverter interface.
func (b *Block) Block() *Block {
return b
}
// Payloads impelmemnts BlockConverter interface.
func (b *Block) Payloads() [][]byte {
return [][]byte{}
}
// SetBlock implments BlockConverter interface.
func (b *Block) SetBlock(block *Block) {
*b = *block
}
// BlockConverter interface define the interface for extracting block
// information from an existing object.
type BlockConverter interface {
Block() *Block
Payloads() [][]byte
SetBlock(block *Block)
}
func (b *Block) String() string {
return fmt.Sprintf("Block(%v)", b.Hash.String()[:6])
}
// Clone returns a deep copy of a block.
func (b *Block) Clone() *Block {
bcopy := &Block{
ProposerID: b.ProposerID,
ParentHash: b.ParentHash,
Hash: b.Hash,
Height: b.Height,
Timestamps: make(map[ValidatorID]time.Time),
Acks: make(map[common.Hash]struct{}),
Signature: b.Signature,
Notary: Notary{
Timestamp: b.Notary.Timestamp,
Height: b.Notary.Height,
},
}
for k, v := range b.Timestamps {
bcopy.Timestamps[k] = v
}
for k, v := range b.Acks {
bcopy.Acks[k] = v
}
return bcopy
}
// IsGenesis checks if the block is a genesisBlock
func (b *Block) IsGenesis() bool {
return b.Height == 0 && b.ParentHash == common.Hash{}
}
// ByHash is the helper type for sorting slice of blocks by hash.
type ByHash []*Block
func (b ByHash) Len() int {
return len(b)
}
func (b ByHash) Less(i int, j int) bool {
return bytes.Compare([]byte(b[i].Hash[:]), []byte(b[j].Hash[:])) == -1
}
func (b ByHash) Swap(i int, j int) {
b[i], b[j] = b[j], b[i]
}
// ByHeight is the helper type for sorting slice of blocks by height.
type ByHeight []*Block
func (b ByHeight) Len() int {
return len(b)
}
func (b ByHeight) Less(i int, j int) bool {
return b[i].Height < b[j].Height
}
func (b ByHeight) Swap(i int, j int) {
b[i], b[j] = b[j], b[i]
}
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