swarm: completed 1st phase of swap accounting

swarm/network/stream/common_test.go

@@ -114,7 +114,7 @@ func newStreamerTester(t *testing.T, registryOptions *RegistryOptions) (*p2ptest
 
 	delivery := NewDelivery(to, netStore)
 	netStore.NewNetFetcherFunc = network.NewFetcherFactory(delivery.RequestFromPeers, true).New
-	streamer := NewRegistry(addr.ID(), delivery, netStore, state.NewInmemoryStore(), registryOptions)
+	streamer := NewRegistry(addr.ID(), delivery, netStore, state.NewInmemoryStore(), registryOptions, nil)
 	teardown := func() {
 		streamer.Close()
 		removeDataDir()

swarm/network/stream/delivery_test.go

@@ -481,7 +481,7 @@ func testDeliveryFromNodes(t *testing.T, nodes, conns, chunkCount int, skipCheck
 				SkipCheck: skipCheck,
 				Syncing:   SyncingDisabled,
 				Retrieval: RetrievalEnabled,
-			})
+			}, nil)
 			bucket.Store(bucketKeyRegistry, r)
 
 			fileStore := storage.NewFileStore(netStore, storage.NewFileStoreParams())
@@ -656,7 +656,7 @@ func benchmarkDeliveryFromNodes(b *testing.B, nodes, conns, chunkCount int, skip
 				Syncing:         SyncingDisabled,
 				Retrieval:       RetrievalDisabled,
 				SyncUpdateDelay: 0,
-			})
+			}, nil)
 
 			fileStore := storage.NewFileStore(netStore, storage.NewFileStoreParams())
 			bucket.Store(bucketKeyFileStore, fileStore)

swarm/network/stream/intervals_test.go

@@ -86,7 +86,7 @@ func testIntervals(t *testing.T, live bool, history *Range, skipCheck bool) {
 				Retrieval: RetrievalDisabled,
 				Syncing:   SyncingRegisterOnly,
 				SkipCheck: skipCheck,
-			})
+			}, nil)
 			bucket.Store(bucketKeyRegistry, r)
 
 			r.RegisterClientFunc(externalStreamName, func(p *Peer, t string, live bool) (Client, error) {

swarm/network/stream/snapshot_retrieval_test.go

@@ -130,7 +130,7 @@ func retrievalStreamerFunc(ctx *adapters.ServiceContext, bucket *sync.Map) (s no
 		Retrieval:       RetrievalEnabled,
 		Syncing:         SyncingAutoSubscribe,
 		SyncUpdateDelay: 3 * time.Second,
-	})
+	}, nil)
 
 	fileStore := storage.NewFileStore(netStore, storage.NewFileStoreParams())
 	bucket.Store(bucketKeyFileStore, fileStore)

swarm/network/stream/snapshot_sync_test.go

@@ -168,7 +168,7 @@ func streamerFunc(ctx *adapters.ServiceContext, bucket *sync.Map) (s node.Servic
 		Retrieval:       RetrievalDisabled,
 		Syncing:         SyncingAutoSubscribe,
 		SyncUpdateDelay: 3 * time.Second,
-	})
+	}, nil)
 
 	bucket.Store(bucketKeyRegistry, r)
 
@@ -362,7 +362,7 @@ func testSyncingViaDirectSubscribe(t *testing.T, chunkCount int, nodeCount int)
 			r := NewRegistry(addr.ID(), delivery, netStore, state.NewInmemoryStore(), &RegistryOptions{
 				Retrieval: RetrievalDisabled,
 				Syncing:   SyncingRegisterOnly,
-			})
+			}, nil)
 			bucket.Store(bucketKeyRegistry, r)
 
 			fileStore := storage.NewFileStore(netStore, storage.NewFileStoreParams())

swarm/network/stream/stream.go

@@ -21,6 +21,7 @@ import (
 	"errors"
 	"fmt"
 	"math"
+	"reflect"
 	"sync"
 	"time"
 
@@ -87,6 +88,9 @@ type Registry struct {
 	intervalsStore state.Store
 	autoRetrieval  bool //automatically subscribe to retrieve request stream
 	maxPeerServers int
+	balance        protocols.Balance //implements protocols.Balance, for accounting
+	prices         protocols.Prices  //implements protocols.Prices, provides prices to accounting
+	spec           *protocols.Spec   //this protocol's spec
 }
 
 // RegistryOptions holds optional values for NewRegistry constructor.
@@ -99,7 +103,7 @@ type RegistryOptions struct {
 }
 
 // NewRegistry is Streamer constructor
-func NewRegistry(localID enode.ID, delivery *Delivery, syncChunkStore storage.SyncChunkStore, intervalsStore state.Store, options *RegistryOptions) *Registry {
+func NewRegistry(localID enode.ID, delivery *Delivery, syncChunkStore storage.SyncChunkStore, intervalsStore state.Store, options *RegistryOptions, balance protocols.Balance) *Registry {
 	if options == nil {
 		options = &RegistryOptions{}
 	}
@@ -119,7 +123,10 @@ func NewRegistry(localID enode.ID, delivery *Delivery, syncChunkStore storage.Sy
 		intervalsStore: intervalsStore,
 		autoRetrieval:  retrieval,
 		maxPeerServers: options.MaxPeerServers,
+		balance:        balance,
 	}
+	streamer.setupSpec()
+
 	streamer.api = NewAPI(streamer)
 	delivery.getPeer = streamer.getPeer
 
@@ -228,6 +235,21 @@ func NewRegistry(localID enode.ID, delivery *Delivery, syncChunkStore storage.Sy
 	return streamer
 }
 
+//This is an accounted protocol, therefore we need to provide a pricing Hook to the spec
+//For simulations to be able to run multiple nodes and not override the hook's balance,
+//we need to construct a spec instance per node instance
+func (r *Registry) setupSpec() {
+	//first create the "bare" spec
+	r.createSpec()
+	//now create the pricing object
+	r.createPriceOracle()
+	//if balance is nil, this node has been started without swap support (swapEnabled flag is false)
+	if r.balance != nil && !reflect.ValueOf(r.balance).IsNil() {
+		//swap is enabled, so setup the hook
+		r.spec.Hook = protocols.NewAccounting(r.balance, r.prices)
+	}
+}
+
 // RegisterClient registers an incoming streamer constructor
 func (r *Registry) RegisterClientFunc(stream string, f func(*Peer, string, bool) (Client, error)) {
 	r.clientMu.Lock()
@@ -492,7 +514,7 @@ func (r *Registry) updateSyncing() {
 }
 
 func (r *Registry) runProtocol(p *p2p.Peer, rw p2p.MsgReadWriter) error {
-	peer := protocols.NewPeer(p, rw, Spec)
+	peer := protocols.NewPeer(p, rw, r.spec)
 	bp := network.NewBzzPeer(peer)
 	np := network.NewPeer(bp, r.delivery.kad)
 	r.delivery.kad.On(np)
@@ -716,10 +738,16 @@ func (c *clientParams) clientCreated() {
 	close(c.clientCreatedC)
 }
 
-// Spec is the spec of the streamer protocol
+func (r *Registry) GetSpec() *protocols.Spec {
-var Spec = &protocols.Spec{
+	return r.spec
+}
+
+func (r *Registry) createSpec() {
+
+	// Spec is the spec of the streamer protocol
+	var spec = &protocols.Spec{
 		Name:       "stream",
-	Version:    8,
+		Version:    7,
 		MaxMsgSize: 10 * 1024 * 1024,
 		Messages: []interface{}{
 			UnsubscribeMsg{},
@@ -734,14 +762,50 @@ var Spec = &protocols.Spec{
 			QuitMsg{},
 			ChunkDeliveryMsgSyncing{},
 		},
+	}
+	r.spec = spec
+}
+
+//An accountable message needs some meta information attached to it
+//in order to evaluate the correct price
+type StreamerPrices struct {
+	priceMatrix map[reflect.Type]*protocols.Price
+	registry    *Registry
+}
+
+func (spo *StreamerPrices) Price(msg interface{}) *protocols.Price {
+	typ := reflect.TypeOf(msg).Elem()
+	return spo.priceMatrix[typ]
+}
+
+func (r *Registry) createPriceOracle() {
+
+	po := &StreamerPrices{
+		registry: r,
+	}
+	po.priceMatrix = map[reflect.Type]*protocols.Price{
+
+		reflect.TypeOf(ChunkDeliveryMsgRetrieval{}): &protocols.Price{
+			Value:   uint64(100),
+			PerByte: true,
+			Payer:   protocols.Receiver,
+		},
+
+		reflect.TypeOf(RetrieveRequestMsg{}): &protocols.Price{
+			Value:   uint64(10),
+			PerByte: false,
+			Payer:   protocols.Sender,
+		},
+	}
+	r.prices = po
 }
 
 func (r *Registry) Protocols() []p2p.Protocol {
 	return []p2p.Protocol{
 		{
-			Name:    Spec.Name,
+			Name:    r.spec.Name,
-			Version: Spec.Version,
+			Version: r.spec.Version,
-			Length:  Spec.Length(),
+			Length:  r.spec.Length(),
 			Run:     r.runProtocol,
 			// NodeInfo: ,
 			// PeerInfo: ,

swarm/network/stream/syncer_test.go

@@ -120,7 +120,7 @@ func testSyncBetweenNodes(t *testing.T, nodes, conns, chunkCount int, skipCheck
 				Retrieval: RetrievalDisabled,
 				Syncing:   SyncingAutoSubscribe,
 				SkipCheck: skipCheck,
-			})
+			}, nil)
 
 			fileStore := storage.NewFileStore(netStore, storage.NewFileStoreParams())
 			bucket.Store(bucketKeyFileStore, fileStore)

swarm/swap/swap.go

@@ -0,0 +1,90 @@
+// 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 swap
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"sync"
+
+	"github.com/ethereum/go-ethereum/p2p/enode"
+	"github.com/ethereum/go-ethereum/p2p/protocols"
+	"github.com/ethereum/go-ethereum/swarm/log"
+	"github.com/ethereum/go-ethereum/swarm/state"
+)
+
+// SwAP Swarm Accounting Protocol
+// a peer to peer micropayment system
+// A node maintains an individual balance with every peer
+// Only messages which have a price will be accounted for
+type Swap struct {
+	stateStore state.Store        //stateStore is needed in order to keep balances across sessions
+	lock       sync.RWMutex       //lock the balances
+	balances   map[enode.ID]int64 //map of balances for each peer
+}
+
+//Swap implements the protocols.Balance interface
+//Add is the (sole) accounting function
+func (s *Swap) Add(amount int64, peer *protocols.Peer) (err error) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	//load existing balances from the state store
+	s.loadState(peer)
+	//adjust the balance
+	//if amount is negative, it will decrease, otherwise increase
+	s.balances[peer.ID()] += amount
+	//save the new balance to the state store
+	peerBalance := s.balances[peer.ID()]
+	s.stateStore.Put(peer.ID().String(), &peerBalance)
+
+	log.Debug(fmt.Sprintf("balance for peer %s: %s", peer.ID().String(), strconv.FormatInt(peerBalance, 10)))
+	return err
+}
+
+//Get a peer's balance
+func (swap *Swap) GetPeerBalance(peer enode.ID) (int64, error) {
+	swap.lock.RLock()
+	defer swap.lock.RUnlock()
+	if p, ok := swap.balances[peer]; ok {
+		return p, nil
+	}
+	return 0, errors.New("Peer not found")
+}
+
+//load balances from the state store (persisted)
+func (s *Swap) loadState(peer *protocols.Peer) {
+	var peerBalance int64
+	peerID := peer.ID()
+	//only load if the current instance doesn't already have this peer's
+	//balance in memory
+	if _, ok := s.balances[peerID]; !ok {
+		s.stateStore.Get(peerID.String(), &peerBalance)
+		s.balances[peerID] = peerBalance
+	}
+}
+
+// New - swap constructor
+func New(stateStore state.Store) (swap *Swap) {
+
+	swap = &Swap{
+		stateStore: stateStore,
+		balances:   make(map[enode.ID]int64),
+	}
+	return
+}

swarm/swap/swap_test.go

@@ -0,0 +1,154 @@
+// Copyreeeeight 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 swap
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	mrand "math/rand"
+	"os"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/p2p/protocols"
+	"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
+	"github.com/ethereum/go-ethereum/swarm/state"
+	colorable "github.com/mattn/go-colorable"
+)
+
+var (
+	loglevel = flag.Int("loglevel", 2, "verbosity of logs")
+)
+
+func init() {
+	flag.Parse()
+
+	log.PrintOrigins(true)
+	log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(*loglevel), log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true))))
+}
+
+//Test that repeated bookings do correct accounting
+func TestRepeatedBookings(t *testing.T) {
+	//create a test swap account
+	swap, testDir := createTestSwap(t)
+	defer os.RemoveAll(testDir)
+
+	testPeer := newDummyPeer()
+	amount := mrand.Intn(100)
+	cnt := 1 + mrand.Intn(10)
+	for i := 0; i < cnt; i++ {
+		swap.Add(int64(amount), testPeer.Peer)
+	}
+	expectedBalance := int64(cnt * amount)
+	realBalance := swap.balances[testPeer.ID()]
+	if expectedBalance != realBalance {
+		t.Fatal(fmt.Sprintf("After %d credits of %d, expected balance to be: %d, but is: %d", cnt, amount, expectedBalance, realBalance))
+	}
+
+	testPeer2 := newDummyPeer()
+	amount = mrand.Intn(100)
+	cnt = 1 + mrand.Intn(10)
+	for i := 0; i < cnt; i++ {
+		swap.Add(0-int64(amount), testPeer2.Peer)
+	}
+	expectedBalance = int64(0 - (cnt * amount))
+	realBalance = swap.balances[testPeer2.ID()]
+	if expectedBalance != realBalance {
+		t.Fatal(fmt.Sprintf("After %d debits of %d, expected balance to be: %d, but is: %d", cnt, amount, expectedBalance, realBalance))
+	}
+
+	//mixed debits and credits
+	amount1 := mrand.Intn(100)
+	amount2 := mrand.Intn(55)
+	amount3 := mrand.Intn(999)
+	swap.Add(int64(amount1), testPeer2.Peer)
+	swap.Add(int64(0-amount2), testPeer2.Peer)
+	swap.Add(int64(0-amount3), testPeer2.Peer)
+
+	expectedBalance = expectedBalance + int64(amount1-amount2-amount3)
+	realBalance = swap.balances[testPeer2.ID()]
+
+	if expectedBalance != realBalance {
+		t.Fatal(fmt.Sprintf("After mixed debits and credits, expected balance to be: %d, but is: %d", expectedBalance, realBalance))
+	}
+}
+
+//try restoring a balance from state store
+//this is simulated by creating a node,
+//assigning it an arbitrary balance,
+//send a message (triggers to save to store),
+//then create a different SwapPeer instance with same peerID,
+//which will try to load a balance from the stateStore
+func TestRestoreBalanceFromStateStore(t *testing.T) {
+	//create a test swap account
+	swap, testDir := createTestSwap(t)
+	defer os.RemoveAll(testDir)
+
+	testPeer := newDummyPeer()
+	swap.balances[testPeer.ID()] = -8888
+
+	tmpBalance := swap.balances[testPeer.ID()]
+	swap.stateStore.Put(testPeer.ID().String(), &tmpBalance)
+
+	swap.stateStore.Close()
+	swap.stateStore = nil
+
+	stateStore, err := state.NewDBStore(testDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var newBalance int64
+	stateStore.Get(testPeer.ID().String(), &newBalance)
+
+	//compare the balances
+	if tmpBalance != newBalance {
+		t.Fatal(fmt.Sprintf("Unexpected balance value after sending cheap message test. Expected balance: %d, balance is: %d",
+			tmpBalance, newBalance))
+	}
+}
+
+//create a test swap account
+//creates a stateStore for persistence and a Swap account
+func createTestSwap(t *testing.T) (*Swap, string) {
+	dir, err := ioutil.TempDir("", "swap_test_store")
+	if err != nil {
+		t.Fatal(err)
+	}
+	stateStore, err2 := state.NewDBStore(dir)
+	if err2 != nil {
+		t.Fatal(err2)
+	}
+	swap := New(stateStore)
+	return swap, dir
+}
+
+type dummyPeer struct {
+	*protocols.Peer
+}
+
+//creates a dummy protocols.Peer with dummy MsgReadWriter
+func newDummyPeer() *dummyPeer {
+	id := adapters.RandomNodeConfig().ID
+	protoPeer := protocols.NewPeer(p2p.NewPeer(id, "testPeer", nil), nil, nil)
+	dummy := &dummyPeer{
+		Peer: protoPeer,
+	}
+	return dummy
+}

swarm/swap_test.go

@@ -0,0 +1,429 @@
+// 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 swarm
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"os"
+	"strconv"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/metrics"
+	"github.com/ethereum/go-ethereum/node"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+	"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"github.com/ethereum/go-ethereum/swarm/log"
+	"github.com/ethereum/go-ethereum/swarm/network/simulation"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+)
+
+//In TestSwapNetworkSymmetricFileUpload we set up a network with arbitrary number of nodes
+//(16), and each of the nodes uploads a file of same size
+//Afterwards we check that every node's balance WITH ANOTHER PEER
+//has the same value but opposite sign
+func TestSwapNetworkSymmetricFileUpload(t *testing.T) {
+	//default hardcoded network size
+	nodeCount := 16
+
+	//setup the simulation
+	//use a complete node setup via `NewSwam`
+	sim := simulation.New(map[string]simulation.ServiceFunc{
+		"swarm": func(ctx *adapters.ServiceContext, bucket *sync.Map) (s node.Service, cleanup func(), err error) {
+			config := api.NewConfig()
+			config.Port = strconv.Itoa(8500 + rand.Intn(9999))
+
+			dir, err := ioutil.TempDir("", "swap-network-test-node"+config.Port)
+			if err != nil {
+				return nil, nil, err
+			}
+			cleanup = func() {
+				err := os.RemoveAll(dir)
+				if err != nil {
+					log.Error("cleaning up swarm temp dir", "err", err)
+				}
+			}
+
+			config.Path = dir
+
+			privkey, err := crypto.GenerateKey()
+			if err != nil {
+				return nil, cleanup, err
+			}
+
+			config.Init(privkey)
+
+			//set Swap to be enabled for this test
+			config.SwapEnabled = true
+
+			swarm, err := NewSwarm(config, nil)
+			if err != nil {
+				return nil, cleanup, err
+			}
+
+			bucket.Store(bucketKeySwarm, swarm)
+			log.Info("new swarm", "bzzKey", config.BzzKey, "baseAddr", fmt.Sprintf("%x", swarm.bzz.BaseAddr()))
+			return swarm, cleanup, nil
+		},
+	})
+	defer sim.Close()
+
+	ctx := context.Background()
+	files := make([]file, 0)
+
+	var checkStatusM sync.Map
+	var nodeStatusM sync.Map
+	var totalFoundCount uint64
+
+	//connect all nodes in a chain
+	_, err := sim.AddNodesAndConnectChain(nodeCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	//run the simulation
+	result := sim.Run(ctx, func(ctx context.Context, sim *simulation.Simulation) error {
+		//wait for kademlia to be healthy
+		if _, err := sim.WaitTillHealthy(ctx, 2); err != nil {
+			return err
+		}
+
+		nodeIDs := sim.UpNodeIDs()
+		shuffle(len(nodeIDs), func(i, j int) {
+			nodeIDs[i], nodeIDs[j] = nodeIDs[j], nodeIDs[i]
+		})
+		//upload a file for every node
+		for _, id := range nodeIDs {
+			item, ok := sim.NodeItem(id, bucketKeySwarm)
+			if !ok {
+				log.Error("No swarm")
+				return errors.New("No swarm")
+			}
+			swarm := item.(*Swarm)
+			key, data, err := uploadFile(swarm)
+			if err != nil {
+				return err
+			}
+			log.Trace("file uploaded", "node", id, "key", key.String())
+			files = append(files, file{
+				addr:   key,
+				data:   data,
+				nodeID: id,
+			})
+		}
+
+		// File retrieval check is repeated until all uploaded files are retrieved from all nodes
+		// or until the timeout is reached.
+		for {
+			if retrieve(sim, files, &checkStatusM, &nodeStatusM, &totalFoundCount) == 0 {
+				break
+			}
+		}
+
+		time.Sleep(5 * time.Second)
+		//every node has a map to all nodes it had interactions
+		//each entry in the map is a map of the other node with all the balances
+		balancesMap := make(map[enode.ID]map[enode.ID]int64)
+
+		//iterate all nodes
+		for _, node := range sim.NodeIDs() {
+			item, ok := sim.NodeItem(node, bucketKeySwarm)
+			if !ok {
+				log.Error("No swarm")
+				return errors.New("No swarm")
+			}
+			swarm := item.(*Swarm)
+
+			//submap for each node is a map of all nodes with the balance for that node
+			subBalances := make(map[enode.ID]int64)
+
+			//iterate all nodes again...
+			//get all balances with other peers for every node
+			for _, n := range sim.NodeIDs() {
+				if node == n {
+					continue
+				}
+
+				//get the peer's balance with this node
+				balance, err := swarm.swap.GetPeerBalance(n)
+				if err == nil {
+					subBalances[n] = balance
+					log.Debug(fmt.Sprintf("Balance of node %s to node %s: %d", node.TerminalString(), n.TerminalString(), balance))
+				} else {
+					log.Debug(fmt.Sprintf("Node %s has no balance with node %s", node.TerminalString(), n.TerminalString()))
+				}
+			}
+			//update the map for this node
+			balancesMap[node] = subBalances
+		}
+
+		//print all the balances if requested
+		if *printStats {
+			for k, v := range balancesMap {
+				fmt.Println(fmt.Sprintf("node %s balances:", k.TerminalString()))
+				for kk, vv := range v {
+					fmt.Println(fmt.Sprintf(".........with node %s: balance %d", kk.TerminalString(), vv))
+				}
+			}
+			//NOTE: this are currently metrics over ALL nodes, not per node
+			fmt.Println(fmt.Sprintf("Total units credited: %d", metrics.Get("account.balance.credit").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Total units debited: %d", metrics.Get("account.balance.debit").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Total bytes credited: %d", metrics.Get("account.bytes.credit").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Total bytes debited: %d", metrics.Get("account.bytes.debit").(metrics.Counter).Count()))
+			//fmt.Println(fmt.Sprintf("Cheques issued: %d", metrics.Get("account.cheques.issued").(metrics.Counter).Count()))
+			//fmt.Println(fmt.Sprintf("Cheques received: %d", metrics.Get("account.cheques.received").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Number of messages credited: %d", metrics.Get("account.msg.credit").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Number of messages debited: %d", metrics.Get("account.msg.debit").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Peers dropped: %d", metrics.Get("account.peerdrops").(metrics.Counter).Count()))
+			fmt.Println(fmt.Sprintf("Number of times node dropped itself: %d", metrics.Get("account.selfdrops").(metrics.Counter).Count()))
+		}
+
+		//now iterate the whole map
+		//and check that every node k has the same
+		//balance with a peer as that peer with the node,
+		//but in inverted signs
+
+		//iterate the map
+		success := true
+		for k, mapForK := range balancesMap {
+			//iterate the submap
+			for n, balanceKwithN := range mapForK {
+				//iterate the main map again
+				for subK, mapForSubK := range balancesMap {
+					//if the node and the peer are the same...
+					if n == subK {
+						log.Trace(fmt.Sprintf("balance of %s with %s: %d", k.TerminalString(), n.TerminalString(), balanceKwithN))
+						log.Trace(fmt.Sprintf("balance of %s with %s: %d", n.TerminalString(), k.TerminalString(), mapForSubK[k]))
+						//...check that they have the same balance in Abs terms and that it is not 0
+						if balanceKwithN+mapForSubK[k] != 0 && balanceKwithN != 0 {
+							log.Error(fmt.Sprintf("Expected balances to be a+b = 0 AND balance(a) != 0, but they are not, balance k with n:  %d, balance n with k: %d", balanceKwithN, mapForSubK[k]))
+							success = false
+						}
+					}
+				}
+			}
+		}
+		if success {
+			return nil
+		}
+		return errors.New("some conditions could not be met")
+	})
+
+	if result.Error != nil {
+		t.Fatal(result.Error)
+	}
+	log.Debug("test terminated")
+}
+
+//TestSwapNetworkAsymmetricFileUpload is a swap test too,
+//but this time the number and size of files are random
+func TestSwapNetworkAsymmetricFileUpload(t *testing.T) {
+	nodeCount := 16
+
+	sim := simulation.New(map[string]simulation.ServiceFunc{
+		"swarm": func(ctx *adapters.ServiceContext, bucket *sync.Map) (s node.Service, cleanup func(), err error) {
+			config := api.NewConfig()
+			config.Port = strconv.Itoa(8500 + rand.Intn(9999))
+
+			dir, err := ioutil.TempDir("", "swap-network-test-node"+config.Port)
+			if err != nil {
+				return nil, nil, err
+			}
+			cleanup = func() {
+				err := os.RemoveAll(dir)
+				if err != nil {
+					log.Error("cleaning up swarm temp dir", "err", err)
+				}
+			}
+
+			config.Path = dir
+
+			privkey, err := crypto.GenerateKey()
+			if err != nil {
+				return nil, cleanup, err
+			}
+
+			config.Init(privkey)
+			//enable swap
+			config.SwapEnabled = true
+
+			swarm, err := NewSwarm(config, nil)
+			if err != nil {
+				return nil, cleanup, err
+			}
+			bucket.Store(bucketKeySwarm, swarm)
+			log.Info("new swarm", "bzzKey", config.BzzKey, "baseAddr", fmt.Sprintf("%x", swarm.bzz.BaseAddr()))
+			return swarm, cleanup, nil
+		},
+	})
+	defer sim.Close()
+
+	ctx := context.Background()
+	files := make([]file, 0)
+
+	var checkStatusM sync.Map
+	var nodeStatusM sync.Map
+	var totalFoundCount uint64
+
+	_, err := sim.AddNodesAndConnectChain(nodeCount)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	//NOTE: maxFileSize is 4 kB, this in order to provide faster tests
+	//it would be interesting to run these tests with bigger files
+	//(to see how drop limits are affected etc.)
+	const maxFileSize = 1024 * 4 //1024 bytes * 4 = 4kB
+	const minfileSize = 1024
+
+	//pseudo random algo to define if a node will upload or not
+	//if a bit is 0, do not upload
+	pseudoRandomNum := rand.Int63()
+	pseudoRandomBitMask := strconv.FormatInt(pseudoRandomNum, 2)
+
+	result := sim.Run(ctx, func(ctx context.Context, sim *simulation.Simulation) error {
+		if _, err := sim.WaitTillHealthy(ctx, 2); err != nil {
+			return err
+		}
+
+		nodeIDs := sim.UpNodeIDs()
+		shuffle(len(nodeIDs), func(i, j int) {
+			nodeIDs[i], nodeIDs[j] = nodeIDs[j], nodeIDs[i]
+		})
+		for i, id := range nodeIDs {
+			//if the position in random num is 0, don't upload
+			if string(pseudoRandomBitMask[i]) != "0" {
+				size := rand.Intn(maxFileSize-minfileSize) + minfileSize
+				key, data, err := uploadRandomFileSize(sim.Service("swarm", id).(*Swarm), size)
+				if err != nil {
+					return err
+				}
+				log.Trace("file uploaded", "node", id, "key", key.String())
+				files = append(files, file{
+					addr:   key,
+					data:   data,
+					nodeID: id,
+				})
+			}
+		}
+
+		// File retrieval check is repeated until all uploaded files are retrieved from all nodes
+		// or until the timeout is reached.
+		for {
+			if retrieve(sim, files, &checkStatusM, &nodeStatusM, &totalFoundCount) == 0 {
+				break
+			}
+		}
+
+		time.Sleep(5 * time.Second)
+
+		balancesMap := make(map[enode.ID]map[enode.ID]int64)
+
+		for _, node := range sim.NodeIDs() {
+			item, ok := sim.NodeItem(node, bucketKeySwarm)
+			if !ok {
+				log.Error("No swarm")
+				return errors.New("no swarm")
+			}
+			swarm := item.(*Swarm)
+
+			subBalances := make(map[enode.ID]int64)
+
+			for _, n := range sim.NodeIDs() {
+				if node == n {
+					continue
+				}
+				balance, err := swarm.swap.GetPeerBalance(n)
+				if err == nil {
+					subBalances[n] = balance
+					log.Debug(fmt.Sprintf("Balance of node %s to node %s: %d", node.TerminalString(), n.TerminalString(), balance))
+				} else {
+					log.Debug(fmt.Sprintf("Node %s has no balance with node %s", node.TerminalString(), n.TerminalString()))
+				}
+			}
+			balancesMap[node] = subBalances
+		}
+
+		if *printStats {
+			for k, v := range balancesMap {
+				fmt.Println(fmt.Sprintf("node %s balances:", k.TerminalString()))
+				for kk, vv := range v {
+					fmt.Println(fmt.Sprintf(".........with node %s: balance %d", kk.TerminalString(), vv))
+				}
+			}
+		}
+
+		/*
+			Assuming that in this case, balances should be symmetric too	I
+		*/
+
+		success := true
+		for k, mapForK := range balancesMap {
+			for n, balanceKwithN := range mapForK {
+				for subK, mapForSubK := range balancesMap {
+					if n == subK {
+						log.Trace(fmt.Sprintf("balance of %s with %s: %d", k.TerminalString(), n.TerminalString(), balanceKwithN))
+						log.Trace(fmt.Sprintf("balance of %s with %s: %d", n.TerminalString(), k.TerminalString(), mapForSubK[k]))
+						if balanceKwithN+mapForSubK[k] != 0 && balanceKwithN != 0 {
+							log.Error(fmt.Sprintf("Expected balances to be a+b = 0 AND balance(a) != 0, but they are not, balance k with n: %d, balance n with k: %d", balanceKwithN, mapForSubK[k]))
+							success = false
+						}
+					}
+				}
+			}
+		}
+
+		if success {
+			return nil
+		}
+
+		return errors.New("some conditions could not be met")
+	})
+
+	if result.Error != nil {
+		t.Fatal(result.Error)
+	}
+	log.Debug("test terminated")
+}
+
+// uploadFile, uploads a short file to the swarm instance
+// using the api.Put method.
+func uploadRandomFileSize(swarm *Swarm, size int) (storage.Address, string, error) {
+	b := make([]byte, size)
+	_, err := rand.Read(b)
+	if err != nil {
+		return nil, "", err
+	}
+	// uniqueness is very certain.
+	data := fmt.Sprintf("test content %s %x", time.Now().Round(0), b)
+	ctx := context.TODO()
+	k, wait, err := swarm.api.Put(ctx, data, "text/plain", false)
+	if err != nil {
+		return nil, "", err
+	}
+	if wait != nil {
+		err = wait(ctx)
+	}
+	return k, data, err
+}

swarm/swarm.go

@@ -78,6 +78,7 @@ type Swarm struct {
 	netStore    *storage.NetStore
 	sfs         *fuse.SwarmFS // need this to cleanup all the active mounts on node exit
 	ps          *pss.Pss
+	swap        *swap.Swap
 
 	tracerClose io.Closer
 }
@@ -171,6 +172,10 @@ func NewSwarm(config *api.Config, mockStore *mock.NodeStore) (self *Swarm, err e
 	delivery := stream.NewDelivery(to, self.netStore)
 	self.netStore.NewNetFetcherFunc = network.NewFetcherFactory(delivery.RequestFromPeers, config.DeliverySkipCheck).New
 
+	if config.SwapEnabled {
+		self.swap = swap.New(stateStore)
+	}
+
 	var nodeID enode.ID
 	if err := nodeID.UnmarshalText([]byte(config.NodeID)); err != nil {
 		return nil, err
@@ -193,7 +198,11 @@ func NewSwarm(config *api.Config, mockStore *mock.NodeStore) (self *Swarm, err e
 		SyncUpdateDelay: config.SyncUpdateDelay,
 		MaxPeerServers:  config.MaxStreamPeerServers,
 	}
-	self.streamer = stream.NewRegistry(nodeID, delivery, self.netStore, stateStore, registryOptions)
+	if config.LightNodeEnabled {
+		registryOptions.DoSync = false
+		registryOptions.DoRetrieve = false
+	}
+	self.streamer = stream.NewRegistry(nodeID, delivery, self.netStore, stateStore, registryOptions, self.swap)
 
 	// Swarm Hash Merklised Chunking for Arbitrary-length Document/File storage
 	self.fileStore = storage.NewFileStore(self.netStore, self.config.FileStoreParams)
@@ -216,7 +225,7 @@ func NewSwarm(config *api.Config, mockStore *mock.NodeStore) (self *Swarm, err e
 
 	log.Debug("Setup local storage")
 
-	self.bzz = network.NewBzz(bzzconfig, to, stateStore, stream.Spec, self.streamer.Run)
+	self.bzz = network.NewBzz(bzzconfig, to, stateStore, self.streamer.GetSpec(), self.streamer.Run)
 
 	// Pss = postal service over swarm (devp2p over bzz)
 	self.ps, err = pss.NewPss(to, config.Pss)
@@ -353,7 +362,7 @@ func (self *Swarm) Start(srv *p2p.Server) error {
 	newaddr := self.bzz.UpdateLocalAddr([]byte(srv.Self().String()))
 	log.Info("Updated bzz local addr", "oaddr", fmt.Sprintf("%x", newaddr.OAddr), "uaddr", fmt.Sprintf("%s", newaddr.UAddr))
 	// set chequebook
-	if self.config.SwapEnabled {
+	if self.config.SwapEnabled && self.config.SwapAPI != "" {
 		ctx := context.Background() // The initial setup has no deadline.
 		err := self.SetChequebook(ctx)
 		if err != nil {