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fakedownloader.go
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fakedownloader.go
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package fastdownloader
import (
"errors"
"fmt"
"github.com/abeychain/go-abey/common"
"github.com/abeychain/go-abey/crypto"
"github.com/abeychain/go-abey/core"
"github.com/abeychain/go-abey/core/types"
dtypes "github.com/abeychain/go-abey/abey/types"
"github.com/abeychain/go-abey/abeydb"
"github.com/abeychain/go-abey/event"
"github.com/abeychain/go-abey/trie"
"math/big"
"sync"
"time"
)
// downloadTester is a test simulator for mocking out local block chain.
type DownloadTester struct {
downloader *Downloader
genesis *types.Block // Genesis blocks used by the tester and peers
stateDb abeydb.Database // Database used by the tester for syncing from peers
peerDb abeydb.Database // Database of the peers containing all data
ownHashes []common.Hash // Hash chain belonging to the tester
ownHeaders map[common.Hash]*types.Header // Headers belonging to the tester
ownBlocks map[common.Hash]*types.Block // Blocks belonging to the tester
ownReceipts map[common.Hash]types.Receipts // Receipts belonging to the tester
ownChainNum map[common.Hash]*big.Int // Total difficulties of the blocks in the local chain
peerHashes map[string][]common.Hash // Hash chain belonging to different test peers
peerHeaders map[string]map[common.Hash]*types.Header // Headers belonging to different test peers
peerBlocks map[string]map[common.Hash]*types.Block // Blocks belonging to different test peers
peerReceipts map[string]map[common.Hash]types.Receipts // Receipts belonging to different test peers
peerChainNums map[string]map[common.Hash]*big.Int // Total difficulties of the blocks in the peer chains
peerMissingStates map[string]map[common.Hash]bool // State entries that fast sync should not return
lock sync.RWMutex
}
var (
testKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
testAddress = crypto.PubkeyToAddress(testKey.PublicKey)
)
// newTester creates a new downloader test mocker.
func NewTester(testdb *abeydb.MemDatabase,stateDb abeydb.Database) *DownloadTester {
genesis := core.GenesisFastBlockForTesting(testdb, testAddress, big.NewInt(1000000000))
tester := &DownloadTester{
genesis: genesis,
peerDb: testdb,
ownHashes: []common.Hash{genesis.Hash()},
ownHeaders: map[common.Hash]*types.Header{genesis.Hash(): genesis.Header()},
ownBlocks: map[common.Hash]*types.Block{genesis.Hash(): genesis},
ownReceipts: map[common.Hash]types.Receipts{genesis.Hash(): nil},
ownChainNum: map[common.Hash]*big.Int{genesis.Hash(): genesis.Number()},
peerHashes: make(map[string][]common.Hash),
peerHeaders: make(map[string]map[common.Hash]*types.Header),
peerBlocks: make(map[string]map[common.Hash]*types.Block),
peerReceipts: make(map[string]map[common.Hash]types.Receipts),
peerChainNums: make(map[string]map[common.Hash]*big.Int),
peerMissingStates: make(map[string]map[common.Hash]bool),
}
tester.stateDb = stateDb
tester.stateDb.Put(genesis.Root().Bytes(), []byte{0x00})
tester.downloader = New(FullSync, tester.stateDb, new(event.TypeMux), tester, nil, tester.dropPeer)
return tester
}
func (dl *DownloadTester) GetGenesis() *types.Block {
return dl.genesis
}
type FloodingTestPeer struct {
peer dtypes.Peer
tester *DownloadTester
pend sync.WaitGroup
}
type DownloadTesterPeer struct {
dl *DownloadTester
id string
delay time.Duration
lock sync.RWMutex
}
// terminate aborts any operations on the embedded downloader and releases all
// held resources.
func (dl *DownloadTester) Terminate() {
dl.downloader.Terminate()
}
func (dl *DownloadTester) GetDownloader() *Downloader {
return dl.downloader
}
// HasFastBlock checks if a block is present in the testers canonical chain.
func (dl *DownloadTester) HasFastBlock(hash common.Hash, number uint64) bool {
dl.lock.RLock()
defer dl.lock.RUnlock()
_, ok := dl.ownReceipts[hash]
return ok
}
// HasHeader checks if a header is present in the testers canonical chain.
func (dl *DownloadTester) HasHeader(hash common.Hash, number uint64) bool {
return dl.GetHeaderByHash(hash) != nil
}
// HasBlock checks if a block is present in the testers canonical chain.
func (dl *DownloadTester) HasBlock(hash common.Hash, number uint64) bool {
return dl.GetBlockByHash(hash) != nil
}
// GetHeader retrieves a header from the testers canonical chain.
func (dl *DownloadTester) GetHeaderByHash(hash common.Hash) *types.Header {
dl.lock.RLock()
defer dl.lock.RUnlock()
return dl.ownHeaders[hash]
}
// GetBlock retrieves a block from the testers canonical chain.
func (dl *DownloadTester) GetBlockByHash(hash common.Hash) *types.Block {
dl.lock.RLock()
defer dl.lock.RUnlock()
return dl.ownBlocks[hash]
}
// CurrentHeader retrieves the current head header from the canonical chain.
func (dl *DownloadTester) CurrentHeader() *types.Header {
dl.lock.RLock()
defer dl.lock.RUnlock()
for i := len(dl.ownHashes) - 1; i >= 0; i-- {
if header := dl.ownHeaders[dl.ownHashes[i]]; header != nil {
return header
}
}
return dl.genesis.Header()
}
// CurrentBlock retrieves the current head block from the canonical chain.
func (dl *DownloadTester) CurrentBlock() *types.Block {
dl.lock.RLock()
defer dl.lock.RUnlock()
for i := len(dl.ownHashes) - 1; i >= 0; i-- {
if block := dl.ownBlocks[dl.ownHashes[i]]; block != nil {
if _, err := dl.stateDb.Get(block.Root().Bytes()); err == nil {
return block
}
}
}
return dl.genesis
}
// CurrentFastBlock retrieves the current head fast-sync block from the canonical chain.
func (dl *DownloadTester) CurrentFastBlock() *types.Block {
dl.lock.RLock()
defer dl.lock.RUnlock()
for i := len(dl.ownHashes) - 1; i >= 0; i-- {
if block := dl.ownBlocks[dl.ownHashes[i]]; block != nil {
return block
}
}
return dl.genesis
}
// FastSyncCommitHead manually sets the head block to a given hash.
func (dl *DownloadTester) FastSyncCommitHead(hash common.Hash) error {
// For now only check that the state trie is correct
if block := dl.GetBlockByHash(hash); block != nil {
_, err := trie.NewSecure(block.Root(), trie.NewDatabase(dl.stateDb), 0)
return err
}
return fmt.Errorf("non existent block: %x", hash[:4])
}
// GetTd retrieves the block's total difficulty from the canonical chain.
func (dl *DownloadTester) GetTd(hash common.Hash, number uint64) *big.Int {
dl.lock.RLock()
defer dl.lock.RUnlock()
return dl.ownChainNum[hash]
}
// InsertHeaderChain injects a new batch of headers into the simulated chain.
func (dl *DownloadTester) InsertHeaderChain(headers []*types.Header, checkFreq int) (int, error) {
dl.lock.Lock()
defer dl.lock.Unlock()
// Do a quick check, as the blockchain.InsertHeaderChain doesn't insert anything in case of errors
if _, ok := dl.ownHeaders[headers[0].ParentHash]; !ok {
return 0, errors.New("unknown parent")
}
for i := 1; i < len(headers); i++ {
if headers[i].ParentHash != headers[i-1].Hash() {
return i, errors.New("unknown parent")
}
}
// Do a full insert if pre-checks passed
for i, header := range headers {
if _, ok := dl.ownHeaders[header.Hash()]; ok {
continue
}
if _, ok := dl.ownHeaders[header.ParentHash]; !ok {
return i, errors.New("unknown parent")
}
dl.ownHashes = append(dl.ownHashes, header.Hash())
dl.ownHeaders[header.Hash()] = header
dl.ownChainNum[header.Hash()] = header.Number
}
return len(headers), nil
}
// InsertChain injects a new batch of blocks into the simulated chain.
func (dl *DownloadTester) InsertChain(blocks types.Blocks) (int, error) {
dl.lock.Lock()
defer dl.lock.Unlock()
for i, block := range blocks {
if parent, ok := dl.ownBlocks[block.ParentHash()]; !ok {
return i, errors.New("unknown parent")
} else if _, err := dl.stateDb.Get(parent.Root().Bytes()); err != nil {
return i, fmt.Errorf("unknown parent state %x: %v", parent.Root(), err)
}
if _, ok := dl.ownHeaders[block.Hash()]; !ok {
dl.ownHashes = append(dl.ownHashes, block.Hash())
dl.ownHeaders[block.Hash()] = block.Header()
}
dl.ownBlocks[block.Hash()] = block
dl.stateDb.Put(block.Root().Bytes(), []byte{0x00})
dl.ownChainNum[block.Hash()] = block.Number()
}
return len(blocks), nil
}
// InsertReceiptChain injects a new batch of receipts into the simulated chain.
func (dl *DownloadTester) InsertReceiptChain(blocks types.Blocks, receipts []types.Receipts) (int, error) {
dl.lock.Lock()
defer dl.lock.Unlock()
for i := 0; i < len(blocks) && i < len(receipts); i++ {
if _, ok := dl.ownHeaders[blocks[i].Hash()]; !ok {
return i, errors.New("unknown owner")
}
if _, ok := dl.ownBlocks[blocks[i].ParentHash()]; !ok {
return i, errors.New("unknown parent")
}
dl.ownBlocks[blocks[i].Hash()] = blocks[i]
dl.ownReceipts[blocks[i].Hash()] = receipts[i]
}
return len(blocks), nil
}
// Rollback removes some recently added elements from the chain.
func (dl *DownloadTester) Rollback(hashes []common.Hash) {
dl.lock.Lock()
defer dl.lock.Unlock()
for i := len(hashes) - 1; i >= 0; i-- {
if dl.ownHashes[len(dl.ownHashes)-1] == hashes[i] {
dl.ownHashes = dl.ownHashes[:len(dl.ownHashes)-1]
}
delete(dl.ownChainNum, hashes[i])
delete(dl.ownHeaders, hashes[i])
delete(dl.ownReceipts, hashes[i])
delete(dl.ownBlocks, hashes[i])
}
}
func (dl *DownloadTester) GetBlockNumber() uint64 {
if dl.CurrentFastBlock().NumberU64() > dl.CurrentBlock().NumberU64() {
return dl.CurrentFastBlock().NumberU64()
}
return dl.CurrentBlock().NumberU64()
}
// newPeer registers a new block download source into the downloader.
func (dl *DownloadTester) NewPeer(id string, version int, hashes []common.Hash, headers map[common.Hash]*types.Header, blocks map[common.Hash]*types.Block, receipts map[common.Hash]types.Receipts) error {
return dl.NewSlowPeer(id, version, hashes, headers, blocks, receipts, 0)
}
// newSlowPeer registers a new block download source into the downloader, with a
// specific delay time on processing the network packets sent to it, simulating
// potentially slow network IO.
func (dl *DownloadTester) NewSlowPeer(id string, version int, hashes []common.Hash, headers map[common.Hash]*types.Header, blocks map[common.Hash]*types.Block, receipts map[common.Hash]types.Receipts, delay time.Duration) error {
dl.lock.Lock()
defer dl.lock.Unlock()
var err = dl.downloader.RegisterPeer(id, version, &DownloadTesterPeer{dl: dl, id: id, delay: delay})
if err == nil {
// Assign the owned hashes, headers and blocks to the peer (deep copy)
dl.peerHashes[id] = make([]common.Hash, len(hashes))
copy(dl.peerHashes[id], hashes)
dl.peerHeaders[id] = make(map[common.Hash]*types.Header)
dl.peerBlocks[id] = make(map[common.Hash]*types.Block)
dl.peerReceipts[id] = make(map[common.Hash]types.Receipts)
dl.peerChainNums[id] = make(map[common.Hash]*big.Int)
dl.peerMissingStates[id] = make(map[common.Hash]bool)
genesis := hashes[len(hashes)-1]
if header := headers[genesis]; header != nil {
dl.peerHeaders[id][genesis] = header
dl.peerChainNums[id][genesis] = header.Number
}
if block := blocks[genesis]; block != nil {
dl.peerBlocks[id][genesis] = block
dl.peerChainNums[id][genesis] = block.Number()
}
for i := len(hashes) - 2; i >= 0; i-- {
hash := hashes[i]
if header, ok := headers[hash]; ok {
dl.peerHeaders[id][hash] = header
if _, ok := dl.peerHeaders[id][header.ParentHash]; ok {
dl.peerChainNums[id][hash] = header.Number
}
}
if block, ok := blocks[hash]; ok {
dl.peerBlocks[id][hash] = block
if _, ok := dl.peerBlocks[id][block.ParentHash()]; ok {
dl.peerChainNums[id][hash] = block.Number()
}
}
if receipt, ok := receipts[hash]; ok {
dl.peerReceipts[id][hash] = receipt
}
}
}
return err
}
// dropPeer simulates a hard peer removal from the connection pool.
func (dl *DownloadTester) dropPeer(id string, call uint32) {
dl.lock.Lock()
defer dl.lock.Unlock()
delete(dl.peerHashes, id)
delete(dl.peerHeaders, id)
delete(dl.peerBlocks, id)
delete(dl.peerChainNums, id)
dl.downloader.UnregisterPeer(id)
}
// setDelay is a thread safe setter for the network delay value.
func (dlp *DownloadTesterPeer) setDelay(delay time.Duration) {
dlp.lock.Lock()
defer dlp.lock.Unlock()
dlp.delay = delay
}
// waitDelay is a thread safe way to sleep for the configured time.
func (dlp *DownloadTesterPeer) waitDelay() {
dlp.lock.RLock()
delay := dlp.delay
dlp.lock.RUnlock()
time.Sleep(delay)
}
// Head constructs a function to retrieve a peer's current head hash
// and total difficulty.
func (dlp *DownloadTesterPeer) Head() (common.Hash, *big.Int) {
dlp.dl.lock.RLock()
defer dlp.dl.lock.RUnlock()
return dlp.dl.peerHashes[dlp.id][0], nil
}
// RequestHeadersByHash constructs a GetBlockHeaders function based on a hashed
// origin; associated with a particular peer in the download tester. The returned
// function can be used to retrieve batches of headers from the particular peer.
func (dlp *DownloadTesterPeer) RequestHeadersByHash(origin common.Hash, amount int, skip int, reverse bool, isFastchain bool) error {
// Find the canonical number of the hash
dlp.dl.lock.RLock()
number := uint64(0)
for num, hash := range dlp.dl.peerHashes[dlp.id] {
if hash == origin {
number = uint64(len(dlp.dl.peerHashes[dlp.id]) - num - 1)
break
}
}
dlp.dl.lock.RUnlock()
// Use the absolute header fetcher to satisfy the query
return dlp.RequestHeadersByNumber(number, amount, skip, reverse, isFastchain)
}
// RequestHeadersByNumber constructs a GetBlockHeaders function based on a numbered
// origin; associated with a particular peer in the download tester. The returned
// function can be used to retrieve batches of headers from the particular peer.
func (dlp *DownloadTesterPeer) RequestHeadersByNumber(origin uint64, amount int, skip int, reverse bool, isFastchain bool) error {
dlp.waitDelay()
dlp.dl.lock.RLock()
defer dlp.dl.lock.RUnlock()
// Gather the next batch of headers
hashes := dlp.dl.peerHashes[dlp.id]
headers := dlp.dl.peerHeaders[dlp.id]
result := make([]*types.Header, 0, amount)
for i := 0; i < amount && len(hashes)-int(origin)-1-i*(skip+1) >= 0; i++ {
if header, ok := headers[hashes[len(hashes)-int(origin)-1-i*(skip+1)]]; ok {
result = append(result, header)
}
}
// Delay delivery a bit to allow attacks to unfold
go func() {
time.Sleep(time.Millisecond)
dlp.dl.downloader.DeliverHeaders(dlp.id, result, types.DownloaderCall)
}()
return nil
}
// RequestBodies constructs a getBlockBodies method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of block bodies from the particularly requested peer.
func (dlp *DownloadTesterPeer) RequestBodies(hashes []common.Hash, isFastchain bool, call uint32) error {
dlp.waitDelay()
dlp.dl.lock.RLock()
defer dlp.dl.lock.RUnlock()
blocks := dlp.dl.peerBlocks[dlp.id]
transactions := make([][]*types.Transaction, 0, len(hashes))
signs := make([][]*types.PbftSign, 0, len(hashes))
infos := make([][]*types.CommitteeMember, 0, len(hashes))
//[]*types.PbftSign
for _, hash := range hashes {
if block, ok := blocks[hash]; ok {
transactions = append(transactions, block.Transactions())
signs = append(signs, block.Signs())
infos = append(infos, block.SwitchInfos())
}
}
go dlp.dl.downloader.DeliverBodies(dlp.id, transactions, signs, infos, types.DownloaderCall)
return nil
}
// RequestReceipts constructs a getReceipts method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of block receipts from the particularly requested peer.
func (dlp *DownloadTesterPeer) RequestReceipts(hashes []common.Hash, isFastchain bool) error {
dlp.waitDelay()
dlp.dl.lock.RLock()
defer dlp.dl.lock.RUnlock()
receipts := dlp.dl.peerReceipts[dlp.id]
results := make([][]*types.Receipt, 0, len(hashes))
for _, hash := range hashes {
if receipt, ok := receipts[hash]; ok {
results = append(results, receipt)
}
}
go dlp.dl.downloader.DeliverReceipts(dlp.id, results)
return nil
}
// RequestNodeData constructs a getNodeData method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of node state data from the particularly requested peer.
func (dlp *DownloadTesterPeer) RequestNodeData(hashes []common.Hash, isFastchain bool) error {
//dlp.waitDelay()
//
//dlp.dl.lock.RLock()
//defer dlp.dl.lock.RUnlock()
//
//results := make([][]byte, 0, len(hashes))
//for _, hash := range hashes {
// if data, err := dlp.dl.peerDb.Get(hash.Bytes()); err == nil {
// if !dlp.dl.peerMissingStates[dlp.id][hash] {
// results = append(results, data)
// }
// }
//}
//go dlp.dl.s.DeliverNodeData(dlp.id, results)
return nil
}