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pseudosettle.go
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pseudosettle.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 pseudosettle
import (
"context"
"errors"
"fmt"
"strings"
"time"
"github.com/ethersphere/bee/pkg/logging"
"github.com/ethersphere/bee/pkg/p2p"
"github.com/ethersphere/bee/pkg/p2p/protobuf"
"github.com/ethersphere/bee/pkg/settlement"
pb "github.com/ethersphere/bee/pkg/settlement/pseudosettle/pb"
"github.com/ethersphere/bee/pkg/storage"
"github.com/ethersphere/bee/pkg/swarm"
)
const (
protocolName = "pseudosettle"
protocolVersion = "1.0.0"
streamName = "pseudosettle"
)
var (
SettlementReceivedPrefix = "pseudosettle_total_received_"
SettlementSentPrefix = "pseudosettle_total_sent_"
)
type Service struct {
streamer p2p.Streamer
logger logging.Logger
store storage.StateStorer
observer settlement.PaymentObserver
metrics metrics
}
func New(streamer p2p.Streamer, logger logging.Logger, store storage.StateStorer) *Service {
return &Service{
streamer: streamer,
logger: logger,
metrics: newMetrics(),
store: store,
}
}
func (s *Service) Protocol() p2p.ProtocolSpec {
return p2p.ProtocolSpec{
Name: protocolName,
Version: protocolVersion,
StreamSpecs: []p2p.StreamSpec{
{
Name: streamName,
Handler: s.handler,
},
},
}
}
func totalKey(peer swarm.Address, prefix string) string {
return fmt.Sprintf("%v%v", prefix, peer.String())
}
func totalKeyPeer(key []byte, prefix string) (peer swarm.Address, err error) {
k := string(key)
split := strings.SplitAfter(k, prefix)
if len(split) != 2 {
return swarm.ZeroAddress, errors.New("no peer in key")
}
return swarm.ParseHexAddress(split[1])
}
func (s *Service) 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 req pb.Payment
if err := r.ReadMsg(&req); err != nil {
return fmt.Errorf("read request from peer %v: %w", p.Address, err)
}
s.metrics.TotalReceivedPseudoSettlements.Add(float64(req.Amount))
s.logger.Tracef("received payment message from peer %v of %d", p.Address, req.Amount)
totalReceived, err := s.TotalReceived(p.Address)
if err != nil {
if !errors.Is(err, settlement.ErrPeerNoSettlements) {
return err
}
totalReceived = 0
}
err = s.store.Put(totalKey(p.Address, SettlementReceivedPrefix), totalReceived+req.Amount)
if err != nil {
return err
}
return s.observer.NotifyPayment(p.Address, req.Amount)
}
// Pay initiates a payment to the given peer
func (s *Service) Pay(ctx context.Context, peer swarm.Address, amount uint64) error {
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
stream, err := s.streamer.NewStream(ctx, peer, nil, protocolName, protocolVersion, streamName)
if err != nil {
return err
}
defer func() {
if err != nil {
_ = stream.Reset()
} else {
go stream.FullClose()
}
}()
s.logger.Tracef("sending payment message to peer %v of %d", peer, amount)
w := protobuf.NewWriter(stream)
err = w.WriteMsgWithContext(ctx, &pb.Payment{
Amount: amount,
})
if err != nil {
return err
}
totalSent, err := s.TotalSent(peer)
if err != nil {
if !errors.Is(err, settlement.ErrPeerNoSettlements) {
return err
}
totalSent = 0
}
err = s.store.Put(totalKey(peer, SettlementSentPrefix), totalSent+amount)
if err != nil {
return err
}
s.metrics.TotalSentPseudoSettlements.Add(float64(amount))
return nil
}
// SetPaymentObserver sets the payment observer which will be notified of incoming payments
func (s *Service) SetPaymentObserver(observer settlement.PaymentObserver) {
s.observer = observer
}
// TotalSent returns the total amount sent to a peer
func (s *Service) TotalSent(peer swarm.Address) (totalSent uint64, err error) {
key := totalKey(peer, SettlementSentPrefix)
err = s.store.Get(key, &totalSent)
if err != nil {
if errors.Is(err, storage.ErrNotFound) {
return 0, settlement.ErrPeerNoSettlements
}
return 0, err
}
return totalSent, nil
}
// TotalReceived returns the total amount received from a peer
func (s *Service) TotalReceived(peer swarm.Address) (totalReceived uint64, err error) {
key := totalKey(peer, SettlementReceivedPrefix)
err = s.store.Get(key, &totalReceived)
if err != nil {
if errors.Is(err, storage.ErrNotFound) {
return 0, settlement.ErrPeerNoSettlements
}
return 0, err
}
return totalReceived, nil
}
// AllSettlements returns all stored settlement values for a given type of prefix (sent or received)
func (s *Service) SettlementsSent() (map[string]uint64, error) {
sent := make(map[string]uint64)
err := s.store.Iterate(SettlementSentPrefix, func(key, val []byte) (stop bool, err error) {
addr, err := totalKeyPeer(key, SettlementSentPrefix)
if err != nil {
return false, fmt.Errorf("parse address from key: %s: %w", string(key), err)
}
if _, ok := sent[addr.String()]; !ok {
var storevalue uint64
err = s.store.Get(totalKey(addr, SettlementSentPrefix), &storevalue)
if err != nil {
return false, fmt.Errorf("get peer %s settlement balance: %w", addr.String(), err)
}
sent[addr.String()] = storevalue
}
return false, nil
})
if err != nil {
return nil, err
}
return sent, nil
}
func (s *Service) SettlementsReceived() (map[string]uint64, error) {
received := make(map[string]uint64)
err := s.store.Iterate(SettlementReceivedPrefix, func(key, val []byte) (stop bool, err error) {
addr, err := totalKeyPeer(key, SettlementReceivedPrefix)
if err != nil {
return false, fmt.Errorf("parse address from key: %s: %w", string(key), err)
}
if _, ok := received[addr.String()]; !ok {
var storevalue uint64
err = s.store.Get(totalKey(addr, SettlementReceivedPrefix), &storevalue)
if err != nil {
return false, fmt.Errorf("get peer %s settlement balance: %w", addr.String(), err)
}
received[addr.String()] = storevalue
}
return false, nil
})
if err != nil {
return nil, err
}
return received, nil
}