plugeth/swarm/network/stream/messages.go

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2018-06-20 12:06:27 +00:00
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum 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-ethereum 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-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package stream
import (
"context"
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"fmt"
"time"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/swarm/log"
bv "github.com/ethereum/go-ethereum/swarm/network/bitvector"
"github.com/ethereum/go-ethereum/swarm/spancontext"
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"github.com/ethereum/go-ethereum/swarm/storage"
"github.com/opentracing/opentracing-go"
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)
var syncBatchTimeout = 30 * time.Second
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// Stream defines a unique stream identifier.
type Stream struct {
// Name is used for Client and Server functions identification.
Name string
// Key is the name of specific stream data.
Key string
// Live defines whether the stream delivers only new data
// for the specific stream.
Live bool
}
func NewStream(name string, key string, live bool) Stream {
return Stream{
Name: name,
Key: key,
Live: live,
}
}
// String return a stream id based on all Stream fields.
func (s Stream) String() string {
t := "h"
if s.Live {
t = "l"
}
return fmt.Sprintf("%s|%s|%s", s.Name, s.Key, t)
}
// SubcribeMsg is the protocol msg for requesting a stream(section)
type SubscribeMsg struct {
Stream Stream
History *Range `rlp:"nil"`
Priority uint8 // delivered on priority channel
}
// RequestSubscriptionMsg is the protocol msg for a node to request subscription to a
// specific stream
type RequestSubscriptionMsg struct {
Stream Stream
History *Range `rlp:"nil"`
Priority uint8 // delivered on priority channel
}
func (p *Peer) handleRequestSubscription(ctx context.Context, req *RequestSubscriptionMsg) (err error) {
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
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log.Debug(fmt.Sprintf("handleRequestSubscription: streamer %s to subscribe to %s with stream %s", p.streamer.addr, p.ID(), req.Stream))
if err = p.streamer.Subscribe(p.ID(), req.Stream, req.History, req.Priority); err != nil {
// The error will be sent as a subscribe error message
// and will not be returned as it will prevent any new message
// exchange between peers over p2p. Instead, error will be returned
// only if there is one from sending subscribe error message.
err = p.Send(ctx, SubscribeErrorMsg{
Error: err.Error(),
})
}
return err
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}
func (p *Peer) handleSubscribeMsg(ctx context.Context, req *SubscribeMsg) (err error) {
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metrics.GetOrRegisterCounter("peer.handlesubscribemsg", nil).Inc(1)
defer func() {
if err != nil {
// The error will be sent as a subscribe error message
// and will not be returned as it will prevent any new message
// exchange between peers over p2p. Instead, error will be returned
// only if there is one from sending subscribe error message.
err = p.Send(context.TODO(), SubscribeErrorMsg{
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Error: err.Error(),
})
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}
}()
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
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log.Debug("received subscription", "from", p.streamer.addr, "peer", p.ID(), "stream", req.Stream, "history", req.History)
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f, err := p.streamer.GetServerFunc(req.Stream.Name)
if err != nil {
return err
}
s, err := f(p, req.Stream.Key, req.Stream.Live)
if err != nil {
return err
}
os, err := p.setServer(req.Stream, s, req.Priority)
if err != nil {
return err
}
var from uint64
var to uint64
if !req.Stream.Live && req.History != nil {
from = req.History.From
to = req.History.To
}
go func() {
if err := p.SendOfferedHashes(os, from, to); err != nil {
log.Warn("SendOfferedHashes error", "peer", p.ID().TerminalString(), "err", err)
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}
}()
if req.Stream.Live && req.History != nil {
// subscribe to the history stream
s, err := f(p, req.Stream.Key, false)
if err != nil {
return err
}
os, err := p.setServer(getHistoryStream(req.Stream), s, getHistoryPriority(req.Priority))
if err != nil {
return err
}
go func() {
if err := p.SendOfferedHashes(os, req.History.From, req.History.To); err != nil {
log.Warn("SendOfferedHashes error", "peer", p.ID().TerminalString(), "err", err)
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}
}()
}
return nil
}
type SubscribeErrorMsg struct {
Error string
}
func (p *Peer) handleSubscribeErrorMsg(req *SubscribeErrorMsg) (err error) {
//TODO the error should be channeled to whoever calls the subscribe
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return fmt.Errorf("subscribe to peer %s: %v", p.ID(), req.Error)
}
type UnsubscribeMsg struct {
Stream Stream
}
func (p *Peer) handleUnsubscribeMsg(req *UnsubscribeMsg) error {
return p.removeServer(req.Stream)
}
type QuitMsg struct {
Stream Stream
}
func (p *Peer) handleQuitMsg(req *QuitMsg) error {
return p.removeClient(req.Stream)
}
// OfferedHashesMsg is the protocol msg for offering to hand over a
// stream section
type OfferedHashesMsg struct {
Stream Stream // name of Stream
From, To uint64 // peer and db-specific entry count
Hashes []byte // stream of hashes (128)
*HandoverProof // HandoverProof
}
// String pretty prints OfferedHashesMsg
func (m OfferedHashesMsg) String() string {
return fmt.Sprintf("Stream '%v' [%v-%v] (%v)", m.Stream, m.From, m.To, len(m.Hashes)/HashSize)
}
// handleOfferedHashesMsg protocol msg handler calls the incoming streamer interface
// Filter method
func (p *Peer) handleOfferedHashesMsg(ctx context.Context, req *OfferedHashesMsg) error {
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metrics.GetOrRegisterCounter("peer.handleofferedhashes", nil).Inc(1)
var sp opentracing.Span
ctx, sp = spancontext.StartSpan(
ctx,
"handle.offered.hashes")
defer sp.Finish()
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c, _, err := p.getOrSetClient(req.Stream, req.From, req.To)
if err != nil {
return err
}
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hashes := req.Hashes
lenHashes := len(hashes)
if lenHashes%HashSize != 0 {
return fmt.Errorf("error invalid hashes length (len: %v)", lenHashes)
}
want, err := bv.New(lenHashes / HashSize)
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if err != nil {
return fmt.Errorf("error initiaising bitvector of length %v: %v", lenHashes/HashSize, err)
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}
ctr := 0
errC := make(chan error)
ctx, cancel := context.WithTimeout(ctx, syncBatchTimeout)
ctx = context.WithValue(ctx, "source", p.ID().String())
for i := 0; i < lenHashes; i += HashSize {
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hash := hashes[i : i+HashSize]
if wait := c.NeedData(ctx, hash); wait != nil {
ctr++
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want.Set(i/HashSize, true)
// create request and wait until the chunk data arrives and is stored
go func(w func(context.Context) error) {
select {
case errC <- w(ctx):
case <-ctx.Done():
}
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}(wait)
}
}
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go func() {
defer cancel()
for i := 0; i < ctr; i++ {
select {
case err := <-errC:
if err != nil {
log.Debug("client.handleOfferedHashesMsg() error waiting for chunk, dropping peer", "peer", p.ID(), "err", err)
p.Drop(err)
return
}
case <-ctx.Done():
log.Debug("client.handleOfferedHashesMsg() context done", "ctx.Err()", ctx.Err())
return
case <-c.quit:
log.Debug("client.handleOfferedHashesMsg() quit")
return
}
}
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select {
case c.next <- c.batchDone(p, req, hashes):
case <-c.quit:
log.Debug("client.handleOfferedHashesMsg() quit")
case <-ctx.Done():
log.Debug("client.handleOfferedHashesMsg() context done", "ctx.Err()", ctx.Err())
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}
}()
// only send wantedKeysMsg if all missing chunks of the previous batch arrived
// except
if c.stream.Live {
c.sessionAt = req.From
}
from, to := c.nextBatch(req.To + 1)
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
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log.Trace("set next batch", "peer", p.ID(), "stream", req.Stream, "from", req.From, "to", req.To, "addr", p.streamer.addr)
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if from == to {
return nil
}
msg := &WantedHashesMsg{
Stream: req.Stream,
Want: want.Bytes(),
From: from,
To: to,
}
go func() {
log.Trace("sending want batch", "peer", p.ID(), "stream", msg.Stream, "from", msg.From, "to", msg.To)
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select {
case err := <-c.next:
if err != nil {
log.Warn("c.next error dropping peer", "err", err)
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p.Drop(err)
return
}
case <-c.quit:
log.Debug("client.handleOfferedHashesMsg() quit")
return
case <-ctx.Done():
log.Debug("client.handleOfferedHashesMsg() context done", "ctx.Err()", ctx.Err())
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return
}
log.Trace("sending want batch", "peer", p.ID(), "stream", msg.Stream, "from", msg.From, "to", msg.To)
err := p.SendPriority(ctx, msg, c.priority, "")
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if err != nil {
log.Warn("SendPriority error", "err", err)
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}
}()
return nil
}
// WantedHashesMsg is the protocol msg data for signaling which hashes
// offered in OfferedHashesMsg downstream peer actually wants sent over
type WantedHashesMsg struct {
Stream Stream
Want []byte // bitvector indicating which keys of the batch needed
From, To uint64 // next interval offset - empty if not to be continued
}
// String pretty prints WantedHashesMsg
func (m WantedHashesMsg) String() string {
return fmt.Sprintf("Stream '%v', Want: %x, Next: [%v-%v]", m.Stream, m.Want, m.From, m.To)
}
// handleWantedHashesMsg protocol msg handler
// * sends the next batch of unsynced keys
// * sends the actual data chunks as per WantedHashesMsg
func (p *Peer) handleWantedHashesMsg(ctx context.Context, req *WantedHashesMsg) error {
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metrics.GetOrRegisterCounter("peer.handlewantedhashesmsg", nil).Inc(1)
log.Trace("received wanted batch", "peer", p.ID(), "stream", req.Stream, "from", req.From, "to", req.To)
s, err := p.getServer(req.Stream)
if err != nil {
return err
}
hashes := s.currentBatch
// launch in go routine since GetBatch blocks until new hashes arrive
go func() {
if err := p.SendOfferedHashes(s, req.From, req.To); err != nil {
log.Warn("SendOfferedHashes error", "peer", p.ID().TerminalString(), "err", err)
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}
}()
// go p.SendOfferedHashes(s, req.From, req.To)
l := len(hashes) / HashSize
log.Trace("wanted batch length", "peer", p.ID(), "stream", req.Stream, "from", req.From, "to", req.To, "lenhashes", len(hashes), "l", l)
want, err := bv.NewFromBytes(req.Want, l)
if err != nil {
return fmt.Errorf("error initiaising bitvector of length %v: %v", l, err)
}
for i := 0; i < l; i++ {
if want.Get(i) {
metrics.GetOrRegisterCounter("peer.handlewantedhashesmsg.actualget", nil).Inc(1)
hash := hashes[i*HashSize : (i+1)*HashSize]
data, err := s.GetData(ctx, hash)
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if err != nil {
return fmt.Errorf("handleWantedHashesMsg get data %x: %v", hash, err)
}
chunk := storage.NewChunk(hash, data)
syncing := true
if err := p.Deliver(ctx, chunk, s.priority, syncing); err != nil {
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return err
}
}
}
return nil
}
// Handover represents a statement that the upstream peer hands over the stream section
type Handover struct {
Stream Stream // name of stream
Start, End uint64 // index of hashes
Root []byte // Root hash for indexed segment inclusion proofs
}
// HandoverProof represents a signed statement that the upstream peer handed over the stream section
type HandoverProof struct {
Sig []byte // Sign(Hash(Serialisation(Handover)))
*Handover
}
// Takeover represents a statement that downstream peer took over (stored all data)
// handed over
type Takeover Handover
// TakeoverProof represents a signed statement that the downstream peer took over
// the stream section
type TakeoverProof struct {
Sig []byte // Sign(Hash(Serialisation(Takeover)))
*Takeover
}
// TakeoverProofMsg is the protocol msg sent by downstream peer
type TakeoverProofMsg TakeoverProof
// String pretty prints TakeoverProofMsg
func (m TakeoverProofMsg) String() string {
return fmt.Sprintf("Stream: '%v' [%v-%v], Root: %x, Sig: %x", m.Stream, m.Start, m.End, m.Root, m.Sig)
}
func (p *Peer) handleTakeoverProofMsg(ctx context.Context, req *TakeoverProofMsg) error {
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_, err := p.getServer(req.Stream)
// store the strongest takeoverproof for the stream in streamer
return err
}