path: root/core/compaction-chain.go

// 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 those comments before open source.

package core

import (
    "sync"
    "time"

    "github.com/dexon-foundation/dexon-consensus-core/common"
    "github.com/dexon-foundation/dexon-consensus-core/core/blockdb"
    "github.com/dexon-foundation/dexon-consensus-core/core/types"
)

type pendingAck struct {
    receivedTime time.Time
}

type compactionChain struct {
    db              blockdb.Reader
    pendingAckLock  sync.RWMutex
    pendingAck      map[common.Hash]*pendingAck
    prevBlockLock   sync.RWMutex
    prevBlock       *types.Block
    witnessAcksLock sync.RWMutex
}

func newCompactionChain(
    db blockdb.Reader,
) *compactionChain {
    return &compactionChain{
        db:         db,
        pendingAck: make(map[common.Hash]*pendingAck),
    }
}

func (cc *compactionChain) sanityCheck(witnessBlock *types.Block) error {
    return nil
}

// TODO(jimmy-dexon): processBlock can be extraced to
// another struct.
func (cc *compactionChain) processBlock(block *types.Block) error {
    prevBlock := cc.lastBlock()
    if prevBlock != nil {
        block.Witness.Height = prevBlock.Witness.Height + 1
    }
    cc.prevBlockLock.Lock()
    defer cc.prevBlockLock.Unlock()
    cc.prevBlock = block
    return nil
}

func (cc *compactionChain) lastBlock() *types.Block {
    cc.prevBlockLock.RLock()
    defer cc.prevBlockLock.RUnlock()
    return cc.prevBlock
}