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pullsync.go
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pullsync.go
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// Copyright 2020 The Swarm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package pullsync provides the pullsync protocol
// implementation.
package pullsync
import (
"context"
"crypto/rand"
"encoding/binary"
"errors"
"fmt"
"io"
"sync"
"time"
"github.com/ethsana/sana/pkg/bitvector"
"github.com/ethsana/sana/pkg/cac"
"github.com/ethsana/sana/pkg/logging"
"github.com/ethsana/sana/pkg/p2p"
"github.com/ethsana/sana/pkg/p2p/protobuf"
"github.com/ethsana/sana/pkg/pullsync/pb"
"github.com/ethsana/sana/pkg/pullsync/pullstorage"
"github.com/ethsana/sana/pkg/soc"
"github.com/ethsana/sana/pkg/storage"
"github.com/ethsana/sana/pkg/swarm"
)
const (
protocolName = "pullsync"
protocolVersion = "1.0.0"
streamName = "pullsync"
cursorStreamName = "cursors"
cancelStreamName = "cancel"
)
var (
ErrUnsolicitedChunk = errors.New("peer sent unsolicited chunk")
cancellationTimeout = 5 * time.Second // explicit ruid cancellation message timeout
)
// how many maximum chunks in a batch
var maxPage = 50
// Interface is the PullSync interface.
type Interface interface {
// SyncInterval syncs a requested interval from the given peer.
// It returns the BinID of highest chunk that was synced from the given
// interval. If the requested interval is too large, the downstream peer
// has the liberty to provide less chunks than requested.
SyncInterval(ctx context.Context, peer swarm.Address, bin uint8, from, to uint64) (topmost uint64, ruid uint32, err error)
// GetCursors retrieves all cursors from a downstream peer.
GetCursors(ctx context.Context, peer swarm.Address) ([]uint64, error)
// CancelRuid cancels active pullsync operation identified by ruid on
// a downstream peer.
CancelRuid(ctx context.Context, peer swarm.Address, ruid uint32) error
}
type Syncer struct {
streamer p2p.Streamer
metrics metrics
logger logging.Logger
storage pullstorage.Storer
quit chan struct{}
wg sync.WaitGroup
unwrap func(swarm.Chunk)
validStamp func(swarm.Chunk, []byte) (swarm.Chunk, error)
ruidMtx sync.Mutex
ruidCtx map[uint32]func()
Interface
io.Closer
}
func New(streamer p2p.Streamer, storage pullstorage.Storer, unwrap func(swarm.Chunk), validStamp func(swarm.Chunk, []byte) (swarm.Chunk, error), logger logging.Logger) *Syncer {
return &Syncer{
streamer: streamer,
storage: storage,
metrics: newMetrics(),
unwrap: unwrap,
validStamp: validStamp,
logger: logger,
ruidCtx: make(map[uint32]func()),
wg: sync.WaitGroup{},
quit: make(chan struct{}),
}
}
func (s *Syncer) Protocol() p2p.ProtocolSpec {
return p2p.ProtocolSpec{
Name: protocolName,
Version: protocolVersion,
StreamSpecs: []p2p.StreamSpec{
{
Name: streamName,
Handler: s.handler,
},
{
Name: cursorStreamName,
Handler: s.cursorHandler,
},
{
Name: cancelStreamName,
Handler: s.cancelHandler,
},
},
}
}
// SyncInterval syncs a requested interval from the given peer.
// It returns the BinID of highest chunk that was synced from the given interval.
// If the requested interval is too large, the downstream peer has the liberty to
// provide less chunks than requested.
func (s *Syncer) SyncInterval(ctx context.Context, peer swarm.Address, bin uint8, from, to uint64) (topmost uint64, ruid uint32, err error) {
stream, err := s.streamer.NewStream(ctx, peer, nil, protocolName, protocolVersion, streamName)
if err != nil {
return 0, 0, fmt.Errorf("new stream: %w", err)
}
defer func() {
if err != nil {
_ = stream.Reset()
} else {
go stream.FullClose()
}
}()
var ru pb.Ruid
b := make([]byte, 4)
_, err = rand.Read(b)
if err != nil {
return 0, 0, fmt.Errorf("crypto rand: %w", err)
}
ru.Ruid = binary.BigEndian.Uint32(b)
w, r := protobuf.NewWriterAndReader(stream)
if err = w.WriteMsgWithContext(ctx, &ru); err != nil {
return 0, 0, fmt.Errorf("write ruid: %w", err)
}
rangeMsg := &pb.GetRange{Bin: int32(bin), From: from, To: to}
if err = w.WriteMsgWithContext(ctx, rangeMsg); err != nil {
return 0, ru.Ruid, fmt.Errorf("write get range: %w", err)
}
var offer pb.Offer
if err = r.ReadMsgWithContext(ctx, &offer); err != nil {
return 0, ru.Ruid, fmt.Errorf("read offer: %w", err)
}
if len(offer.Hashes)%swarm.HashSize != 0 {
return 0, ru.Ruid, fmt.Errorf("inconsistent hash length")
}
// empty interval (no chunks present in interval).
// return the end of the requested range as topmost.
if len(offer.Hashes) == 0 {
return offer.Topmost, ru.Ruid, nil
}
var (
bvLen = len(offer.Hashes) / swarm.HashSize
wantChunks = make(map[string]struct{})
ctr = 0
)
bv, err := bitvector.New(bvLen)
if err != nil {
return 0, ru.Ruid, fmt.Errorf("new bitvector: %w", err)
}
for i := 0; i < len(offer.Hashes); i += swarm.HashSize {
a := swarm.NewAddress(offer.Hashes[i : i+swarm.HashSize])
if a.Equal(swarm.ZeroAddress) {
// i'd like to have this around to see we don't see any of these in the logs
s.logger.Errorf("syncer got a zero address hash on offer")
return 0, ru.Ruid, fmt.Errorf("zero address on offer")
}
s.metrics.OfferCounter.Inc()
s.metrics.DbOpsCounter.Inc()
have, err := s.storage.Has(ctx, a)
if err != nil {
return 0, ru.Ruid, fmt.Errorf("storage has: %w", err)
}
if !have {
wantChunks[a.String()] = struct{}{}
ctr++
s.metrics.WantCounter.Inc()
bv.Set(i / swarm.HashSize)
}
}
wantMsg := &pb.Want{BitVector: bv.Bytes()}
if err = w.WriteMsgWithContext(ctx, wantMsg); err != nil {
return 0, ru.Ruid, fmt.Errorf("write want: %w", err)
}
// if ctr is zero, it means we don't want any chunk in the batch
// thus, the following loop will not get executed and the method
// returns immediately with the topmost value on the offer, which
// will seal the interval and request the next one
err = nil
var chunksToPut []swarm.Chunk
for ; ctr > 0; ctr-- {
var delivery pb.Delivery
if err = r.ReadMsgWithContext(ctx, &delivery); err != nil {
// this is not a fatal error and we should write
// a partial batch if some chunks have been received.
err = fmt.Errorf("read delivery: %w", err)
break
}
addr := swarm.NewAddress(delivery.Address)
if _, ok := wantChunks[addr.String()]; !ok {
// this is fatal for the entire batch, return the
// error and don't write the partial batch.
return 0, ru.Ruid, ErrUnsolicitedChunk
}
delete(wantChunks, addr.String())
s.metrics.DeliveryCounter.Inc()
chunk := swarm.NewChunk(addr, delivery.Data)
if chunk, err = s.validStamp(chunk, delivery.Stamp); err != nil {
s.logger.Debugf("unverified chunk: %w", err)
continue
}
if cac.Valid(chunk) {
go s.unwrap(chunk)
} else if !soc.Valid(chunk) {
// this is fatal for the entire batch, return the
// error and don't write the partial batch.
return 0, ru.Ruid, swarm.ErrInvalidChunk
}
chunksToPut = append(chunksToPut, chunk)
}
if len(chunksToPut) > 0 {
s.metrics.DbOpsCounter.Inc()
if ierr := s.storage.Put(ctx, storage.ModePutSync, chunksToPut...); ierr != nil {
if err != nil {
ierr = fmt.Errorf(", sync err: %w", err)
}
return 0, ru.Ruid, fmt.Errorf("delivery put: %w", ierr)
}
}
// there might have been an error in the for loop above,
// return it if it indeed happened
if err != nil {
return 0, ru.Ruid, err
}
return offer.Topmost, ru.Ruid, nil
}
// handler handles an incoming request to sync an interval
func (s *Syncer) handler(ctx context.Context, p p2p.Peer, stream p2p.Stream) (err error) {
r := protobuf.NewReader(stream)
defer func() {
if err != nil {
_ = stream.Reset()
} else {
_ = stream.FullClose()
}
}()
var ru pb.Ruid
if err := r.ReadMsgWithContext(ctx, &ru); err != nil {
return fmt.Errorf("send ruid: %w", err)
}
ctx, cancel := context.WithCancel(ctx)
s.ruidMtx.Lock()
s.ruidCtx[ru.Ruid] = cancel
s.ruidMtx.Unlock()
cc := make(chan struct{})
defer close(cc)
go func() {
select {
case <-s.quit:
case <-ctx.Done():
case <-cc:
}
cancel()
s.ruidMtx.Lock()
delete(s.ruidCtx, ru.Ruid)
s.ruidMtx.Unlock()
}()
select {
case <-s.quit:
return nil
default:
}
s.wg.Add(1)
defer s.wg.Done()
var rn pb.GetRange
if err := r.ReadMsgWithContext(ctx, &rn); err != nil {
return fmt.Errorf("read get range: %w", err)
}
// make an offer to the upstream peer in return for the requested range
offer, _, err := s.makeOffer(ctx, rn)
if err != nil {
return fmt.Errorf("make offer: %w", err)
}
// recreate the reader to allow the first one to be garbage collected
// before the makeOffer function call, to reduce the total memory allocated
// while makeOffer is executing (waiting for the new chunks)
w, r := protobuf.NewWriterAndReader(stream)
if err := w.WriteMsgWithContext(ctx, offer); err != nil {
return fmt.Errorf("write offer: %w", err)
}
// we don't have any hashes to offer in this range (the
// interval is empty). nothing more to do
if len(offer.Hashes) == 0 {
return nil
}
var want pb.Want
if err := r.ReadMsgWithContext(ctx, &want); err != nil {
return fmt.Errorf("read want: %w", err)
}
chs, err := s.processWant(ctx, offer, &want)
if err != nil {
return fmt.Errorf("process want: %w", err)
}
for _, v := range chs {
stamp, err := v.Stamp().MarshalBinary()
if err != nil {
return fmt.Errorf("serialise stamp: %w", err)
}
deliver := pb.Delivery{Address: v.Address().Bytes(), Data: v.Data(), Stamp: stamp}
if err := w.WriteMsgWithContext(ctx, &deliver); err != nil {
return fmt.Errorf("write delivery: %w", err)
}
}
time.Sleep(50 * time.Millisecond) // because of test, getting EOF w/o
return nil
}
// makeOffer tries to assemble an offer for a given requested interval.
func (s *Syncer) makeOffer(ctx context.Context, rn pb.GetRange) (o *pb.Offer, addrs []swarm.Address, err error) {
chs, top, err := s.storage.IntervalChunks(ctx, uint8(rn.Bin), rn.From, rn.To, maxPage)
if err != nil {
return o, nil, err
}
o = new(pb.Offer)
o.Topmost = top
o.Hashes = make([]byte, 0)
for _, v := range chs {
o.Hashes = append(o.Hashes, v.Bytes()...)
}
return o, chs, nil
}
// processWant compares a received Want to a sent Offer and returns
// the appropriate chunks from the local store.
func (s *Syncer) processWant(ctx context.Context, o *pb.Offer, w *pb.Want) ([]swarm.Chunk, error) {
l := len(o.Hashes) / swarm.HashSize
bv, err := bitvector.NewFromBytes(w.BitVector, l)
if err != nil {
return nil, err
}
var addrs []swarm.Address
for i := 0; i < len(o.Hashes); i += swarm.HashSize {
if bv.Get(i / swarm.HashSize) {
a := swarm.NewAddress(o.Hashes[i : i+swarm.HashSize])
addrs = append(addrs, a)
}
}
s.metrics.DbOpsCounter.Inc()
return s.storage.Get(ctx, storage.ModeGetSync, addrs...)
}
func (s *Syncer) GetCursors(ctx context.Context, peer swarm.Address) (retr []uint64, err error) {
stream, err := s.streamer.NewStream(ctx, peer, nil, protocolName, protocolVersion, cursorStreamName)
if err != nil {
return nil, fmt.Errorf("new stream: %w", err)
}
defer func() {
if err != nil {
_ = stream.Reset()
} else {
go stream.FullClose()
}
}()
w, r := protobuf.NewWriterAndReader(stream)
syn := &pb.Syn{}
if err = w.WriteMsgWithContext(ctx, syn); err != nil {
return nil, fmt.Errorf("write syn: %w", err)
}
var ack pb.Ack
if err = r.ReadMsgWithContext(ctx, &ack); err != nil {
return nil, fmt.Errorf("read ack: %w", err)
}
retr = ack.Cursors
return retr, nil
}
func (s *Syncer) cursorHandler(ctx context.Context, p p2p.Peer, stream p2p.Stream) (err error) {
w, r := protobuf.NewWriterAndReader(stream)
defer func() {
if err != nil {
_ = stream.Reset()
} else {
_ = stream.FullClose()
}
}()
var syn pb.Syn
if err := r.ReadMsgWithContext(ctx, &syn); err != nil {
return fmt.Errorf("read syn: %w", err)
}
var ack pb.Ack
s.metrics.DbOpsCounter.Inc()
ints, err := s.storage.Cursors(ctx)
if err != nil {
return err
}
ack.Cursors = ints
if err = w.WriteMsgWithContext(ctx, &ack); err != nil {
return fmt.Errorf("write ack: %w", err)
}
return nil
}
func (s *Syncer) CancelRuid(ctx context.Context, peer swarm.Address, ruid uint32) (err error) {
stream, err := s.streamer.NewStream(ctx, peer, nil, protocolName, protocolVersion, cancelStreamName)
if err != nil {
return fmt.Errorf("new stream: %w", err)
}
w := protobuf.NewWriter(stream)
defer func() {
if err != nil {
_ = stream.Reset()
} else {
go stream.FullClose()
}
}()
ctx, cancel := context.WithTimeout(ctx, cancellationTimeout)
defer cancel()
var c pb.Cancel
c.Ruid = ruid
if err := w.WriteMsgWithContext(ctx, &c); err != nil {
return fmt.Errorf("send cancellation: %w", err)
}
return nil
}
// handler handles an incoming request to explicitly cancel a ruid
func (s *Syncer) cancelHandler(ctx context.Context, p p2p.Peer, stream p2p.Stream) (err error) {
r := protobuf.NewReader(stream)
defer func() {
if err != nil {
_ = stream.Reset()
} else {
_ = stream.FullClose()
}
}()
var c pb.Cancel
if err := r.ReadMsgWithContext(ctx, &c); err != nil {
return fmt.Errorf("read cancel: %w", err)
}
s.ruidMtx.Lock()
defer s.ruidMtx.Unlock()
if cancel, ok := s.ruidCtx[c.Ruid]; ok {
cancel()
}
delete(s.ruidCtx, c.Ruid)
return nil
}
func (s *Syncer) Close() error {
s.logger.Info("pull syncer shutting down")
close(s.quit)
cc := make(chan struct{})
go func() {
defer close(cc)
s.wg.Wait()
}()
// cancel all contexts
s.ruidMtx.Lock()
for _, c := range s.ruidCtx {
c()
}
s.ruidMtx.Unlock()
select {
case <-cc:
case <-time.After(5 * time.Second):
s.logger.Warning("pull syncer shutting down with running goroutines")
}
return nil
}