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blocks_collection.go
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blocks_collection.go
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// Copyright 2016 The go-daylight Authors
// This file is part of the go-daylight library.
//
// The go-daylight 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 go-daylight 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 go-daylight library. If not, see <http://www.gnu.org/licenses/>.
package daemons
import (
"context"
"errors"
"fmt"
"io/ioutil"
"time"
"github.com/ug93tad/go-apla/packages/block"
"github.com/ug93tad/go-apla/packages/conf"
"github.com/ug93tad/go-apla/packages/conf/syspar"
"github.com/ug93tad/go-apla/packages/consts"
"github.com/ug93tad/go-apla/packages/converter"
"github.com/ug93tad/go-apla/packages/crypto"
"github.com/ug93tad/go-apla/packages/model"
"github.com/ug93tad/go-apla/packages/rollback"
"github.com/ug93tad/go-apla/packages/service"
"github.com/ug93tad/go-apla/packages/tcpserver"
"github.com/ug93tad/go-apla/packages/transaction"
"github.com/ug93tad/go-apla/packages/utils"
log "github.com/sirupsen/logrus"
)
// ErrNodesUnavailable is returned when all nodes is unavailable
var ErrNodesUnavailable = errors.New("All nodes unavailable")
// BlocksCollection collects and parses blocks
func BlocksCollection(ctx context.Context, d *daemon) error {
if ctx.Err() != nil {
d.logger.WithFields(log.Fields{"type": consts.ContextError, "error": ctx.Err()}).Error("context error")
return ctx.Err()
}
return blocksCollection(ctx, d)
}
func InitialLoad(logger *log.Entry) error {
// check for initial load
toLoad, err := needLoad(logger)
if err != nil {
return err
}
if toLoad {
logger.Debug("start first block loading")
if err := firstLoad(logger); err != nil {
return err
}
}
return nil
}
func blocksCollection(ctx context.Context, d *daemon) (err error) {
hosts, err := filterBannedHosts(syspar.GetRemoteHosts())
if err != nil {
return err
}
var (
chooseFromConfig bool
host string
maxBlockID int64
)
if len(hosts) > 0 {
// get a host with the biggest block id from system parameters
host, maxBlockID, err = utils.ChooseBestHost(ctx, hosts, d.logger)
if err != nil {
if err == utils.ErrNodesUnavailable {
chooseFromConfig = true
} else {
return err
}
}
} else {
chooseFromConfig = true
}
if chooseFromConfig {
// get a host with the biggest block id from config
log.Debug("Getting a host with biggest block from config")
hosts = conf.GetNodesAddr()
if len(hosts) > 0 {
host, maxBlockID, err = utils.ChooseBestHost(ctx, hosts, d.logger)
if err != nil {
return err
}
}
}
infoBlock := &model.InfoBlock{}
found, err := infoBlock.Get()
if err != nil {
log.WithFields(log.Fields{"type": consts.DBError, "error": err}).Error("Getting cur blockID")
return err
}
if !found {
log.WithFields(log.Fields{"type": consts.NotFound, "error": err}).Error("Info block not found")
return errors.New("Info block not found")
}
if infoBlock.BlockID >= maxBlockID {
log.WithFields(log.Fields{"blockID": infoBlock.BlockID, "maxBlockID": maxBlockID}).Debug("Max block is already in the host")
return nil
}
DBLock()
defer func() {
DBUnlock()
service.NodeDoneUpdatingBlockchain()
}()
// update our chain till maxBlockID from the host
return UpdateChain(ctx, d, host, maxBlockID)
}
// UpdateChain load from host all blocks from our last block to maxBlockID
func UpdateChain(ctx context.Context, d *daemon, host string, maxBlockID int64) error {
// get current block id from our blockchain
curBlock := &model.InfoBlock{}
if _, err := curBlock.Get(); err != nil {
d.logger.WithFields(log.Fields{"type": consts.DBError, "error": err}).Error("Getting info block")
return err
}
if ctx.Err() != nil {
d.logger.WithFields(log.Fields{"type": consts.ContextError, "error": ctx.Err()}).Error("context error")
return ctx.Err()
}
playRawBlock := func(rawBlocksQueueCh chan []byte) error {
for rb := range rawBlocksQueueCh {
b, err := block.ProcessBlockWherePrevFromBlockchainTable(rb, true)
if err != nil {
// we got bad block and should ban this host
banNode(host, b, err)
d.logger.WithFields(log.Fields{"error": err, "type": consts.BlockError}).Error("processing block")
return err
}
// hash compare could be failed in the case of fork
hashMatched, thisErrIsOk := b.CheckHash()
if thisErrIsOk != nil {
d.logger.WithFields(log.Fields{"error": err, "type": consts.BlockError}).Error("checking block hash")
}
if !hashMatched {
transaction.CleanCache()
//it should be fork, replace our previous blocks to ones from the host
err := GetBlocks(b.Header.BlockID-1, host)
if err != nil {
d.logger.WithFields(log.Fields{"error": err, "type": consts.ParserError}).Error("processing block")
banNode(host, b, err)
return err
}
}
b.PrevHeader, err = block.GetBlockDataFromBlockChain(b.Header.BlockID - 1)
if err != nil {
banNode(host, b, err)
return utils.ErrInfo(fmt.Errorf("can't get block %d", b.Header.BlockID-1))
}
if err = b.Check(); err != nil {
banNode(host, b, err)
return err
}
if err = b.PlaySafe(); err != nil {
banNode(host, b, err)
return err
}
}
return nil
}
st := time.Now()
d.logger.Infof("starting downloading blocks from %d to %d (%d) \n", curBlock.BlockID, maxBlockID, maxBlockID-curBlock.BlockID)
count := 0
var err error
for blockID := curBlock.BlockID + 1; blockID <= maxBlockID; blockID += int64(tcpserver.BlocksPerRequest) {
var rawBlocksChan chan []byte
rawBlocksChan, err = utils.GetBlocksBody(host, blockID, tcpserver.BlocksPerRequest, consts.DATA_TYPE_BLOCK_BODY, false)
if err != nil {
d.logger.WithFields(log.Fields{"error": err, "type": consts.BlockError}).Error("getting block body")
break
}
err = playRawBlock(rawBlocksChan)
if err != nil {
d.logger.WithFields(log.Fields{"error": err, "type": consts.BlockError}).Error("playing raw block")
break
}
count++
}
if err != nil {
d.logger.WithFields(log.Fields{"error": err, "type": consts.BlockError}).Error("retrieving blockchain from node")
} else {
d.logger.Infof("%d blocks was collected (%s) \n", count, time.Since(st).String())
}
return err
}
// init first block from file or from embedded value
func loadFirstBlock(logger *log.Entry) error {
newBlock, err := ioutil.ReadFile(conf.Config.FirstBlockPath)
if err != nil {
logger.WithFields(log.Fields{
"type": consts.IOError, "error": err, "path": conf.Config.FirstBlockPath,
}).Error("reading first block from file")
}
if err = block.InsertBlockWOForks(newBlock, false, true); err != nil {
logger.WithFields(log.Fields{"type": consts.ParserError, "error": err}).Error("inserting new block")
return err
}
return nil
}
func firstLoad(logger *log.Entry) error {
DBLock()
defer DBUnlock()
return loadFirstBlock(logger)
}
func needLoad(logger *log.Entry) (bool, error) {
infoBlock := &model.InfoBlock{}
_, err := infoBlock.Get()
if err != nil {
logger.WithFields(log.Fields{"error": err, "type": consts.DBError}).Error("getting info block")
return false, err
}
// we have empty blockchain, we need to load blockchain from file or other source
if infoBlock.BlockID == 0 {
logger.Debug("blockchain should be loaded")
return true, nil
}
return false, nil
}
func banNode(host string, block *block.Block, err error) {
var (
reason string
blockId, blockTime int64
)
if err != nil {
if err == transaction.ErrDuplicatedTx {
return
}
reason = err.Error()
}
if block != nil {
blockId, blockTime = block.Header.BlockID, block.Header.Time
} else {
blockId, blockTime = -1, time.Now().Unix()
}
log.WithFields(log.Fields{"reason": reason, "host": host, "block_id": blockId, "block_time": blockTime}).Debug("ban node")
n, err := syspar.GetNodeByHost(host)
if err != nil {
log.WithFields(log.Fields{"error": err}).Error("getting node by host")
return
}
err = service.GetNodesBanService().RegisterBadBlock(n, blockId, blockTime, reason)
if err != nil {
log.WithFields(log.Fields{"error": err, "node": n.KeyID, "block": blockId}).Error("registering bad block from node")
}
}
func filterBannedHosts(hosts []string) ([]string, error) {
var goodHosts []string
for _, h := range hosts {
n, err := syspar.GetNodeByHost(h)
if err != nil {
log.WithFields(log.Fields{"error": err}).Error("getting node by host")
return nil, err
}
if !service.GetNodesBanService().IsBanned(n) {
goodHosts = append(goodHosts, n.TCPAddress)
}
}
return goodHosts, nil
}
// GetBlocks is returning blocks
func GetBlocks(blockID int64, host string) error {
blocks, err := getBlocks(blockID, host)
if err != nil {
return err
}
transaction.CleanCache()
// mark all transaction as unverified
_, err = model.MarkVerifiedAndNotUsedTransactionsUnverified()
if err != nil {
log.WithFields(log.Fields{
"error": err,
"type": consts.DBError,
}).Error("marking verified and not used transactions unverified")
return utils.ErrInfo(err)
}
// get starting blockID from slice of blocks
if len(blocks) > 0 {
blockID = blocks[len(blocks)-1].Header.BlockID
}
// we have the slice of blocks for applying
// first of all we should rollback old blocks
block := &model.Block{}
myRollbackBlocks, err := block.GetBlocksFrom(blockID-1, "desc", 0)
if err != nil {
log.WithFields(log.Fields{"error": err, "type": consts.DBError}).Error("getting rollback blocks from blockID")
return utils.ErrInfo(err)
}
for _, block := range myRollbackBlocks {
err := rollback.RollbackBlock(block.Data, false)
if err != nil {
return utils.ErrInfo(err)
}
}
return processBlocks(blocks)
}
func getBlocks(blockID int64, host string) ([]*block.Block, error) {
rollback := syspar.GetRbBlocks1()
badBlocks := make(map[int64]string)
blocks := make([]*block.Block, 0)
var count int64
// load the block bodies from the host
blocksCh, err := utils.GetBlocksBody(host, blockID, tcpserver.BlocksPerRequest, consts.DATA_TYPE_BLOCK_BODY, true)
if err != nil {
return nil, utils.ErrInfo(err)
}
for binaryBlock := range blocksCh {
if blockID < 2 {
break
}
// if the limit of blocks received from the node was exaggerated
if count > int64(rollback) {
break
}
block, err := block.ProcessBlockWherePrevFromBlockchainTable(binaryBlock, true)
if err != nil {
return nil, utils.ErrInfo(err)
}
if badBlocks[block.Header.BlockID] == string(converter.BinToHex(block.Header.Sign)) {
log.WithFields(log.Fields{"block_id": block.Header.BlockID, "type": consts.InvalidObject}).Error("block is bad")
return nil, utils.ErrInfo(errors.New("bad block"))
}
if block.Header.BlockID != blockID {
log.WithFields(log.Fields{"header_block_id": block.Header.BlockID, "block_id": blockID, "type": consts.InvalidObject}).Error("block ids does not match")
return nil, utils.ErrInfo(errors.New("bad block_data['block_id']"))
}
// TODO: add checking for MAX_BLOCK_SIZE
// the public key of the one who has generated this block
nodePublicKey, err := syspar.GetNodePublicKeyByPosition(block.Header.NodePosition)
if err != nil {
log.WithFields(log.Fields{"header_block_id": block.Header.BlockID, "block_id": blockID, "type": consts.InvalidObject}).Error("block ids does not match")
return nil, utils.ErrInfo(err)
}
// SIGN from 128 bytes to 512 bytes. Signature of TYPE, BLOCK_ID, PREV_BLOCK_HASH, TIME, WALLET_ID, state_id, MRKL_ROOT
forSign := fmt.Sprintf("0,%v,%x,%v,%v,%v,%v,%s",
block.Header.BlockID, block.PrevHeader.Hash, block.Header.Time,
block.Header.EcosystemID, block.Header.KeyID, block.Header.NodePosition,
block.MrklRoot,
)
// save the block
blocks = append(blocks, block)
blockID--
count++
// check the signature
_, okSignErr := utils.CheckSign([][]byte{nodePublicKey}, forSign, block.Header.Sign, true)
if okSignErr == nil {
break
}
}
return blocks, nil
}
func processBlocks(blocks []*block.Block) error {
dbTransaction, err := model.StartTransaction()
if err != nil {
log.WithFields(log.Fields{"error": err, "type": consts.DBError}).Error("starting transaction")
return utils.ErrInfo(err)
}
// go through new blocks from the smallest block_id to the largest block_id
prevBlocks := make(map[int64]*block.Block, 0)
for i := len(blocks) - 1; i >= 0; i-- {
b := blocks[i]
if prevBlocks[b.Header.BlockID-1] != nil {
b.PrevHeader.Hash = prevBlocks[b.Header.BlockID-1].Header.Hash
b.PrevHeader.Time = prevBlocks[b.Header.BlockID-1].Header.Time
b.PrevHeader.BlockID = prevBlocks[b.Header.BlockID-1].Header.BlockID
b.PrevHeader.EcosystemID = prevBlocks[b.Header.BlockID-1].Header.EcosystemID
b.PrevHeader.KeyID = prevBlocks[b.Header.BlockID-1].Header.KeyID
b.PrevHeader.NodePosition = prevBlocks[b.Header.BlockID-1].Header.NodePosition
}
forSha := fmt.Sprintf("%d,%x,%s,%d,%d,%d,%d", b.Header.BlockID, b.PrevHeader.Hash, b.MrklRoot, b.Header.Time, b.Header.EcosystemID, b.Header.KeyID, b.Header.NodePosition)
hash, err := crypto.DoubleHash([]byte(forSha))
if err != nil {
log.WithFields(log.Fields{"type": consts.CryptoError, "error": err}).Fatal("double hashing block")
}
b.Header.Hash = hash
if err := b.Check(); err != nil {
dbTransaction.Rollback()
return err
}
if err := b.Play(dbTransaction); err != nil {
dbTransaction.Rollback()
return utils.ErrInfo(err)
}
prevBlocks[b.Header.BlockID] = b
// for last block we should update block info
if i == 0 {
err := block.UpdBlockInfo(dbTransaction, b)
if err != nil {
dbTransaction.Rollback()
return utils.ErrInfo(err)
}
}
if b.SysUpdate {
if err := syspar.SysUpdate(dbTransaction); err != nil {
log.WithFields(log.Fields{"type": consts.DBError, "error": err}).Error("updating syspar")
return utils.ErrInfo(err)
}
}
}
// If all right we can delete old blockchain and write new
for i := len(blocks) - 1; i >= 0; i-- {
b := blocks[i]
// Delete old blocks from blockchain
bl := &model.Block{}
err = bl.DeleteById(dbTransaction, b.Header.BlockID)
if err != nil {
dbTransaction.Rollback()
return err
}
// insert new blocks into blockchain
if err := block.InsertIntoBlockchain(dbTransaction, b); err != nil {
dbTransaction.Rollback()
return err
}
}
return dbTransaction.Commit()
}