/
actors.go
712 lines (672 loc) · 17.1 KB
/
actors.go
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package dman
import (
"context"
"fmt"
"sync"
"time"
"github.com/dgraph-io/badger/v2"
grpc_retry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
"github.com/alicenet/alicenet/consensus/objs"
"github.com/alicenet/alicenet/errorz"
"github.com/alicenet/alicenet/interfaces"
"github.com/alicenet/alicenet/middleware"
"github.com/alicenet/alicenet/utils"
)
const (
backoffAmount = 1 // 1 ms backoff per
retryMax = 6 // equates to approx 4 seconds
)
// RootActor spawns top level actor types for download manager.
// This system allows the synchronously run consensus algorithm to request the
// download of tx state and blocks from remote peers as a background task.
// The system keeps a record of all pending downloads to prevent double entry
// and stores all state requested into a hot cache that is flushed to disk
// by the synchronous code. This system will retry failed requests until
// the height lag is raised to a point that invalidates the given
// request.
type RootActor struct {
sync.Mutex
ba *blockActor
wg *sync.WaitGroup
closeChan chan struct{}
closeOnce sync.Once
dispatchQ chan DownloadRequest
database databaseView
txc *txCache
bhc *bHCache
logger *logrus.Logger
reqs map[string]bool
}
func (a *RootActor) Init(logger *logrus.Logger, proxy typeProxyIface) error {
a.txc = &txCache{}
err := a.txc.Init(proxy)
if err != nil {
utils.DebugTrace(logger, err)
return err
}
a.bhc = &bHCache{}
err = a.bhc.Init()
if err != nil {
utils.DebugTrace(logger, err)
return err
}
a.closeOnce = sync.Once{}
a.reqs = make(map[string]bool)
a.wg = new(sync.WaitGroup)
a.closeChan = make(chan struct{})
a.dispatchQ = make(chan DownloadRequest)
a.logger = logger
a.ba = &blockActor{}
a.database = proxy
return a.ba.init(a.dispatchQ, logger, proxy, a.closeChan)
}
func (a *RootActor) Start() {
go a.ba.start()
}
func (a *RootActor) Close() {
a.closeOnce.Do(func() {
close(a.closeChan)
a.wg.Wait()
})
}
// TODO verify blockheader cache is being cleaned.
func (a *RootActor) FlushCacheToDisk(txn *badger.Txn, height uint32) error {
txList, txHashList := a.txc.GetHeight(height + 1)
for i := 0; i < len(txList); i++ {
txb, err := txList[i].MarshalBinary()
if err != nil {
return err
}
if err := a.database.SetTxCacheItem(txn, height, []byte(txHashList[i]), txb); err != nil {
return err
}
}
return nil
}
// CleanCache flushes all items older than 5 blocks from cache.
func (a *RootActor) CleanCache(txn *badger.Txn, height uint32) error {
if height > 10 {
dropKeys := a.bhc.DropBeforeHeight(height - 5)
dropKeys = append(dropKeys, a.txc.DropBeforeHeight(height-5)...)
for i := 0; i < len(dropKeys); i++ {
delete(a.reqs, dropKeys[i])
}
}
return nil
}
// DownloadPendingTx downloads txs that are pending from remote peers.
func (a *RootActor) DownloadPendingTx(height, round uint32, txHash []byte) {
req := NewTxDownloadRequest(txHash, PendingTxRequest, height, round)
a.download(req, false)
}
// DownloadPendingTx downloads txs that are mined from remote peers.
func (a *RootActor) DownloadMinedTx(height, round uint32, txHash []byte) {
req := NewTxDownloadRequest(txHash, MinedTxRequest, height, round)
a.download(req, false)
}
func (a *RootActor) DownloadTx(height, round uint32, txHash []byte) {
req := NewTxDownloadRequest(txHash, PendingAndMinedTxRequest, height, round)
a.download(req, false)
}
// DownloadBlockHeader downloads block headers from remote peers.
func (a *RootActor) DownloadBlockHeader(height, round uint32) {
req := NewBlockHeaderDownloadRequest(height, round, BlockHeaderRequest)
a.download(req, false)
}
func (a *RootActor) download(b DownloadRequest, retry bool) {
select {
case <-a.closeChan:
return
default:
a.wg.Add(1)
go a.doDownload(b, retry)
}
}
func (a *RootActor) doDownload(b DownloadRequest, retry bool) {
defer a.wg.Done()
switch b.DownloadType() {
case PendingTxRequest, MinedTxRequest:
ok := func() bool {
a.Lock()
defer a.Unlock()
if a.txc.Contains([]byte(b.Identifier())) {
return false
}
if _, exists := a.reqs[b.Identifier()]; exists {
return retry
}
a.reqs[b.Identifier()] = true
return true
}()
if !ok {
return
}
select {
case <-a.closeChan:
return
case a.dispatchQ <- b:
a.await(b)
}
case PendingAndMinedTxRequest:
ok := func() bool {
a.Lock()
defer a.Unlock()
if a.txc.Contains([]byte(b.Identifier())) {
return false
}
if _, exists := a.reqs[b.Identifier()]; exists {
return false
}
a.reqs[b.Identifier()] = true
return true
}()
if !ok {
return
}
bc0 := &TxDownloadRequest{
TxHash: []byte(b.Identifier()),
Dtype: PendingTxRequest,
Height: b.RequestHeight(),
Round: b.RequestRound(),
responseChan: make(chan DownloadResponse, 1),
}
bc1 := &TxDownloadRequest{
TxHash: []byte(b.Identifier()),
Dtype: MinedTxRequest,
Height: b.RequestHeight(),
Round: b.RequestRound(),
responseChan: make(chan DownloadResponse, 1),
}
ptxc := make(chan struct{})
mtxc := make(chan struct{})
go func() {
defer close(ptxc)
select {
case <-a.closeChan:
return
case a.dispatchQ <- bc0:
a.await(bc0)
}
}()
go func() {
defer close(mtxc)
select {
case <-a.closeChan:
return
case a.dispatchQ <- bc1:
a.await(bc1)
}
}()
select {
case <-a.closeChan:
return
case <-ptxc:
select {
case <-a.closeChan:
return
case <-mtxc:
}
case <-mtxc:
select {
case <-a.closeChan:
return
case <-ptxc:
}
}
case BlockHeaderRequest:
ok := func() bool {
a.Lock()
defer a.Unlock()
if a.bhc.Contains(b.RequestHeight()) {
return false
}
if _, exists := a.reqs[b.Identifier()]; exists {
return retry
}
a.reqs[b.Identifier()] = true
return true
}()
if !ok {
return
}
select {
case <-a.closeChan:
return
case a.dispatchQ <- b:
a.await(b)
}
default:
panic(b.DownloadType())
}
}
func (a *RootActor) await(req DownloadRequest) {
select {
case <-a.closeChan:
return
case resp := <-req.ResponseChan():
if resp == nil {
return
}
switch resp.DownloadType() {
case PendingTxRequest, MinedTxRequest:
r := resp.(*TxDownloadResponse)
if r.Err != nil {
exists := a.txc.Contains(r.TxHash)
if !exists {
utils.DebugTrace(a.logger, r.Err)
defer a.download(req, true)
}
return
}
ok := func() bool {
if err := a.txc.Add(resp.RequestHeight(), r.Tx); err != nil {
utils.DebugTrace(a.logger, err)
return false
}
return true
}()
if ok {
return
}
defer a.download(req, true)
case BlockHeaderRequest:
r := resp.(*BlockHeaderDownloadResponse)
if r.Err != nil {
utils.DebugTrace(a.logger, r.Err)
defer a.download(req, true)
return
}
ok := func() bool {
if err := a.bhc.Add(r.BH); err != nil {
utils.DebugTrace(a.logger, err)
return false
}
return true
}()
if ok {
return
}
defer a.download(req, true)
default:
panic(req.DownloadType())
}
}
}
// block actor does height based filter drop on requests.
type blockActor struct {
sync.RWMutex
ra *downloadActor
WorkQ chan DownloadRequest
dispatchQ chan DownloadRequest
CurrentHeight uint32
Logger *logrus.Logger
closeChan chan struct{}
}
func (a *blockActor) init(workQ chan DownloadRequest, logger *logrus.Logger, reqBus typeProxyIface, closeChan chan struct{}) error {
a.WorkQ = workQ
a.dispatchQ = make(chan DownloadRequest)
a.ra = &downloadActor{}
a.Logger = logger
a.closeChan = closeChan
return a.ra.init(a.dispatchQ, logger, reqBus, a.closeChan)
}
func (a *blockActor) start() {
go a.run()
a.ra.start()
}
func (a *blockActor) updateHeight(newHeight uint32) {
a.Lock()
defer a.Unlock()
if newHeight > a.CurrentHeight {
a.CurrentHeight = newHeight
}
}
func (a *blockActor) getHeight() uint32 {
a.RLock()
defer a.RUnlock()
return a.CurrentHeight
}
func (a *blockActor) run() {
for {
select {
case <-a.closeChan:
return
case req := <-a.WorkQ:
ok := func() bool {
a.Lock()
defer a.Unlock()
if req.RequestHeight()+heightDropLag < a.CurrentHeight {
close(req.ResponseChan())
return false
}
return true
}()
if !ok {
continue
}
go a.await(req)
}
}
}
func (a *blockActor) await(req DownloadRequest) {
var subReq DownloadRequest
switch req.DownloadType() {
case PendingTxRequest, MinedTxRequest:
reqTyped := req.(*TxDownloadRequest)
subReq = NewTxDownloadRequest(reqTyped.TxHash, reqTyped.Dtype, reqTyped.Height, reqTyped.Round)
select {
case <-a.closeChan:
return
case a.dispatchQ <- subReq:
}
case BlockHeaderRequest:
reqTyped := req.(*BlockHeaderDownloadRequest)
subReq = NewBlockHeaderDownloadRequest(reqTyped.Height, reqTyped.Round, reqTyped.Dtype)
select {
case <-a.closeChan:
return
case a.dispatchQ <- subReq:
}
default:
panic(fmt.Sprintf("req download type not found: %v", req.DownloadType()))
}
select {
case <-a.closeChan:
return
case resp := <-subReq.ResponseChan():
if resp == nil {
close(req.ResponseChan())
return
}
ok := func() bool {
a.RLock()
defer a.RUnlock()
if a.CurrentHeight > heightDropLag+1 {
return resp.RequestHeight() >= a.CurrentHeight-heightDropLag
}
return true
}()
if !ok {
close(req.ResponseChan())
return
}
select {
case <-a.closeChan:
return
case req.ResponseChan() <- resp:
}
}
}
// download actor does download dispatch based on request type to worker pools.
type downloadActor struct {
WorkQ chan DownloadRequest
PendingDispatchQ chan *TxDownloadRequest
MinedDispatchQ chan *TxDownloadRequest
BlockDispatchQ chan *BlockHeaderDownloadRequest
ptxa *pendingDownloadActor
mtxa *minedDownloadActor
bha *blockHeaderDownloadActor
Logger *logrus.Logger
closeChan chan struct{}
}
func (a *downloadActor) init(workQ chan DownloadRequest, logger *logrus.Logger, reqBus typeProxyIface, closeChan chan struct{}) error {
a.PendingDispatchQ = make(chan *TxDownloadRequest, downloadWorkerCountPendingTx)
a.MinedDispatchQ = make(chan *TxDownloadRequest, downloadWorkerCountMinedTx)
a.BlockDispatchQ = make(chan *BlockHeaderDownloadRequest, downloadWorkerCountBlockHeader)
a.WorkQ = workQ
a.ptxa = &pendingDownloadActor{}
a.Logger = logger
a.closeChan = closeChan
if err := a.ptxa.init(a.PendingDispatchQ, logger, reqBus, closeChan); err != nil {
return err
}
a.mtxa = &minedDownloadActor{}
if err := a.mtxa.init(a.MinedDispatchQ, logger, reqBus, closeChan); err != nil {
return err
}
a.bha = &blockHeaderDownloadActor{}
if err := a.bha.init(a.BlockDispatchQ, logger, reqBus, closeChan); err != nil {
return err
}
return nil
}
func (a *downloadActor) start() {
go a.run()
a.ptxa.start()
a.mtxa.start()
a.bha.start()
}
func (a *downloadActor) run() {
for {
select {
case <-a.closeChan:
return
case req := <-a.WorkQ:
switch req.DownloadType() {
case PendingTxRequest:
select {
case a.PendingDispatchQ <- req.(*TxDownloadRequest):
default:
a.ptxa.start()
a.PendingDispatchQ <- req.(*TxDownloadRequest)
}
case MinedTxRequest:
select {
case a.MinedDispatchQ <- req.(*TxDownloadRequest):
default:
a.mtxa.start()
a.MinedDispatchQ <- req.(*TxDownloadRequest)
}
case BlockHeaderRequest:
select {
case a.BlockDispatchQ <- req.(*BlockHeaderDownloadRequest):
default:
a.bha.start()
a.BlockDispatchQ <- req.(*BlockHeaderDownloadRequest)
}
default:
panic(req.DownloadType())
}
}
}
}
type minedDownloadActor struct {
sync.Mutex
numWorkers int
WorkQ chan *TxDownloadRequest
reqBus typeProxyIface
Logger *logrus.Logger
closeChan chan struct{}
}
func (a *minedDownloadActor) init(workQ chan *TxDownloadRequest, logger *logrus.Logger, reqBus typeProxyIface, closeChan chan struct{}) error {
a.WorkQ = workQ
a.reqBus = reqBus
a.Logger = logger
a.closeChan = closeChan
return nil
}
func (a *minedDownloadActor) start() {
a.Lock()
defer a.Unlock()
for i := 0; i < 2; i++ {
if a.numWorkers < downloadWorkerCountMinedTx {
a.numWorkers++
go a.run()
}
}
}
func (a *minedDownloadActor) run() {
for {
select {
case <-time.After(10 * time.Second):
a.Lock()
if a.numWorkers > 1 {
a.numWorkers--
a.Unlock()
return
}
a.Unlock()
case <-a.closeChan:
return
case reqOrig := <-a.WorkQ:
tx, err := func(req *TxDownloadRequest) (interfaces.Transaction, error) {
opts := []grpc.CallOption{
grpc_retry.WithBackoff(grpc_retry.BackoffExponentialWithJitter(backoffAmount*time.Millisecond, .1)),
grpc_retry.WithMax(retryMax),
}
peerOpt := middleware.NewPeerInterceptor()
newOpts := append(opts, peerOpt)
txLst, err := a.reqBus.RequestP2PGetMinedTxs(context.Background(), [][]byte{req.TxHash}, newOpts...)
if err != nil {
utils.DebugTrace(a.Logger, err)
return nil, errorz.ErrInvalid{}.New(err.Error())
}
peer := peerOpt.Peer()
if len(txLst) != 1 {
peer.Feedback(-3)
return nil, errorz.ErrInvalid{}.New("Downloaded more than 1 txn when only should have 1")
}
tx, err := a.reqBus.UnmarshalTx(utils.CopySlice(txLst[0]))
if err != nil {
peer.Feedback(-2)
utils.DebugTrace(a.Logger, err)
return nil, errorz.ErrInvalid{}.New(err.Error())
}
return tx, nil
}(reqOrig)
reqOrig.ResponseChan() <- NewTxDownloadResponse(reqOrig, tx, MinedTxRequest, err)
}
}
}
type pendingDownloadActor struct {
sync.Mutex
numWorkers int
WorkQ chan *TxDownloadRequest
reqBus typeProxyIface
Logger *logrus.Logger
closeChan chan struct{}
}
func (a *pendingDownloadActor) init(workQ chan *TxDownloadRequest, logger *logrus.Logger, reqBus typeProxyIface, closeChan chan struct{}) error {
a.WorkQ = workQ
a.reqBus = reqBus
a.Logger = logger
a.closeChan = closeChan
return nil
}
func (a *pendingDownloadActor) start() {
a.Lock()
defer a.Unlock()
for i := 0; i < 2; i++ {
if a.numWorkers < downloadWorkerCountPendingTx {
a.numWorkers++
go a.run()
}
}
}
func (a *pendingDownloadActor) run() {
for {
select {
case <-time.After(10 * time.Second):
a.Lock()
if a.numWorkers > 1 {
a.numWorkers--
a.Unlock()
return
}
a.Unlock()
case <-a.closeChan:
return
case reqOrig := <-a.WorkQ:
tx, err := func(req *TxDownloadRequest) (interfaces.Transaction, error) {
opts := []grpc.CallOption{
grpc_retry.WithBackoff(grpc_retry.BackoffExponentialWithJitter(backoffAmount*time.Millisecond, .1)),
grpc_retry.WithMax(retryMax),
}
peerOpt := middleware.NewPeerInterceptor()
newOpts := append(opts, peerOpt)
txLst, err := a.reqBus.RequestP2PGetPendingTx(context.Background(), [][]byte{req.TxHash}, newOpts...)
if err != nil {
utils.DebugTrace(a.Logger, err)
return nil, errorz.ErrInvalid{}.New(err.Error())
}
peer := peerOpt.Peer()
if len(txLst) != 1 {
peer.Feedback(-3)
return nil, errorz.ErrInvalid{}.New("Downloaded more than 1 txn when only should have 1")
}
tx, err := a.reqBus.UnmarshalTx(utils.CopySlice(txLst[0]))
if err != nil {
peer.Feedback(-2)
utils.DebugTrace(a.Logger, err)
return nil, errorz.ErrInvalid{}.New(err.Error())
}
return tx, nil
}(reqOrig)
reqOrig.ResponseChan() <- NewTxDownloadResponse(reqOrig, tx, PendingTxRequest, err)
}
}
}
type blockHeaderDownloadActor struct {
sync.Mutex
numWorkers int
WorkQ chan *BlockHeaderDownloadRequest
reqBus typeProxyIface
Logger *logrus.Logger
closeChan chan struct{}
}
func (a *blockHeaderDownloadActor) init(workQ chan *BlockHeaderDownloadRequest, logger *logrus.Logger, reqBus typeProxyIface, closeChan chan struct{}) error {
a.WorkQ = workQ
a.reqBus = reqBus
a.Logger = logger
a.closeChan = closeChan
return nil
}
func (a *blockHeaderDownloadActor) start() {
a.Lock()
defer a.Unlock()
for i := 0; i < 2; i++ {
if a.numWorkers < downloadWorkerCountBlockHeader {
a.numWorkers++
go a.run()
}
}
}
func (a *blockHeaderDownloadActor) run() {
for {
select {
case <-time.After(10 * time.Second):
a.Lock()
if a.numWorkers > 1 {
a.numWorkers--
a.Unlock()
return
}
a.Unlock()
case <-a.closeChan:
return
case reqOrig := <-a.WorkQ:
bh, err := func(req *BlockHeaderDownloadRequest) (*objs.BlockHeader, error) {
opts := []grpc.CallOption{
grpc_retry.WithBackoff(grpc_retry.BackoffExponentialWithJitter(backoffAmount*time.Millisecond, .1)),
grpc_retry.WithMax(retryMax),
}
peerOpt := middleware.NewPeerInterceptor()
newOpts := append(opts, peerOpt)
bhLst, err := a.reqBus.RequestP2PGetBlockHeaders(context.Background(), []uint32{req.Height}, newOpts...)
if err != nil {
utils.DebugTrace(a.Logger, err)
return nil, errorz.ErrInvalid{}.New(err.Error())
}
peer := peerOpt.Peer()
if len(bhLst) != 1 {
peer.Feedback(-3)
return nil, errorz.ErrInvalid{}.New("Downloaded more than 1 block header when only should have 1")
}
return bhLst[0], nil
}(reqOrig)
reqOrig.ResponseChan() <- NewBlockHeaderDownloadResponse(reqOrig, bh, BlockHeaderRequest, err)
}
}
}