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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/>.
package types
import (
"bytes"
"fmt"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/crypto"
)
// Status represents the block process state.
type Status int
// Block Status.
const (
BlockStatusInit Status = iota
BlockStatusAcked
BlockStatusOrdering
BlockStatusFinal
)
// CompactionChainAck represents the acking to the compaction chain.
type CompactionChainAck struct {
AckingBlockHash common.Hash `json:"acking_block_hash"`
// Signature is the signature of the hash value of
// Block.ConsensusInfoParentHash and Block.ConsensusInfo.
ConsensusSignature crypto.Signature `json:"consensus_signature"`
}
// ConsensusInfo represents the consensus information on the compaction chain.
type ConsensusInfo struct {
Timestamp time.Time `json:"timestamp"`
Height uint64 `json:"height"`
}
// 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"`
CompactionChainAck CompactionChainAck `json:"compaction_chain_ack"`
ConsensusInfo ConsensusInfo `json:"consensus_info"`
// ConsensusInfoParentHash is the hash value of Block.ConsensusInfoParentHash
// and Block.ConsensusInfo, where Block is the previous block on
// the compaction chain.
ConsensusInfoParentHash common.Hash `json:"consensus_info_parent_hash"`
Ackeds map[common.Hash]struct{} `json:"-"`
AckedValidators map[ValidatorID]struct{} `json:"-"`
Status Status `json:"-"`
}
// BlockConverter interface define the interface for extracting block
// information from an existing object.
type BlockConverter interface {
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{}),
CompactionChainAck: CompactionChainAck{
AckingBlockHash: b.CompactionChainAck.AckingBlockHash,
},
ConsensusInfo: ConsensusInfo{
Timestamp: b.ConsensusInfo.Timestamp,
Height: b.ConsensusInfo.Height,
},
ConsensusInfoParentHash: b.ConsensusInfoParentHash,
}
bcopy.CompactionChainAck.ConsensusSignature = append(
crypto.Signature(nil), b.CompactionChainAck.ConsensusSignature...)
for k, v := range b.Timestamps {
bcopy.Timestamps[k] = v
}
for k, v := range b.Acks {
bcopy.Acks[k] = v
}
return bcopy
}
// 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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