feat: allow disabling value and provider storage/messages

fixes #274

dht.go

@@ -73,6 +73,8 @@ type IpfsDHT struct {
 	triggerRtRefresh      chan struct{}
 
 	maxRecordAge time.Duration
+
+	enableProviders, enableValues bool
 }
 
 // Assert that IPFS assumptions about interfaces aren't broken. These aren't a
@@ -98,6 +100,8 @@ func New(ctx context.Context, h host.Host, options ...opts.Option) (*IpfsDHT, er
 	dht.rtRefreshQueryTimeout = cfg.RoutingTable.RefreshQueryTimeout
 
 	dht.maxRecordAge = cfg.MaxRecordAge
+	dht.enableProviders = cfg.EnableProviders
+	dht.enableValues = cfg.EnableValues
 
 	// register for network notifs.
 	dht.host.Network().Notify((*netNotifiee)(dht))

dht_test.go

@@ -107,13 +107,15 @@ func (testAtomicPutValidator) Select(_ string, bs [][]byte) (int, error) {
 	return index, nil
 }
 
-func setupDHT(ctx context.Context, t *testing.T, client bool) *IpfsDHT {
+func setupDHT(ctx context.Context, t *testing.T, client bool, options ...opts.Option) *IpfsDHT {
 	d, err := New(
 		ctx,
 		bhost.New(swarmt.GenSwarm(t, ctx, swarmt.OptDisableReuseport)),
-		opts.Client(client),
-		opts.NamespacedValidator("v", blankValidator{}),
-		opts.DisableAutoRefresh(),
+		append([]opts.Option{
+			opts.Client(client),
+			opts.NamespacedValidator("v", blankValidator{}),
+			opts.DisableAutoRefresh(),
+		}, options...)...,
 	)
 	if err != nil {
 		t.Fatal(err)
@@ -1419,6 +1421,62 @@ func TestFindClosestPeers(t *testing.T) {
 	}
 }
 
+func TestProvideDisabled(t *testing.T) {
+	k := testCaseCids[0]
+	for i := 0; i < 3; i++ {
+		enabledA := (i & 0x1) > 0
+		enabledB := (i & 0x2) > 0
+		t.Run(fmt.Sprintf("a=%v/b=%v", enabledA, enabledB), func(t *testing.T) {
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+
+			dhtA := setupDHT(ctx, t, false, opts.EnableProviders(enabledA))
+			dhtB := setupDHT(ctx, t, false, opts.EnableProviders(enabledB))
+
+			defer dhtA.Close()
+			defer dhtB.Close()
+			defer dhtA.host.Close()
+			defer dhtB.host.Close()
+
+			connect(t, ctx, dhtA, dhtB)
+
+			err := dhtB.Provide(ctx, k, true)
+			if enabledB {
+				if err != nil {
+					t.Fatal("put should have succeeded on node B", err)
+				}
+			} else {
+				if err != routing.ErrNotSupported {
+					t.Fatal("should not have put the value to node B", err)
+				}
+				_, err = dhtB.FindProviders(ctx, k)
+				if err != routing.ErrNotSupported {
+					t.Fatal("get should have failed on node B")
+				}
+				provs := dhtB.providers.GetProviders(ctx, k)
+				if len(provs) != 0 {
+					t.Fatal("node B should not have found local providers")
+				}
+			}
+
+			provs, err := dhtA.FindProviders(ctx, k)
+			if enabledA {
+				if len(provs) != 0 {
+					t.Fatal("node A should not have found providers")
+				}
+			} else {
+				if err != routing.ErrNotSupported {
+					t.Fatal("node A should not have found providers")
+				}
+			}
+			provAddrs := dhtA.providers.GetProviders(ctx, k)
+			if len(provAddrs) != 0 {
+				t.Fatal("node A should not have found local providers")
+			}
+		})
+	}
+}
+
 func TestGetSetPluggedProtocol(t *testing.T) {
 	t.Run("PutValue/GetValue - same protocol", func(t *testing.T) {
 		ctx, cancel := context.WithCancel(context.Background())

handlers.go

@@ -26,21 +26,31 @@ type dhtHandler func(context.Context, peer.ID, *pb.Message) (*pb.Message, error)
 
 func (dht *IpfsDHT) handlerForMsgType(t pb.Message_MessageType) dhtHandler {
 	switch t {
-	case pb.Message_GET_VALUE:
-		return dht.handleGetValue
-	case pb.Message_PUT_VALUE:
-		return dht.handlePutValue
 	case pb.Message_FIND_NODE:
 		return dht.handleFindPeer
-	case pb.Message_ADD_PROVIDER:
-		return dht.handleAddProvider
-	case pb.Message_GET_PROVIDERS:
-		return dht.handleGetProviders
 	case pb.Message_PING:
 		return dht.handlePing
-	default:
-		return nil
 	}
+
+	if dht.enableValues {
+		switch t {
+		case pb.Message_GET_VALUE:
+			return dht.handleGetValue
+		case pb.Message_PUT_VALUE:
+			return dht.handlePutValue
+		}
+	}
+
+	if dht.enableProviders {
+		switch t {
+		case pb.Message_ADD_PROVIDER:
+			return dht.handleAddProvider
+		case pb.Message_GET_PROVIDERS:
+			return dht.handleGetProviders
+		}
+	}
+
+	return nil
 }
 
 func (dht *IpfsDHT) handleGetValue(ctx context.Context, p peer.ID, pmes *pb.Message) (_ *pb.Message, err error) {

opts/options.go

@@ -21,12 +21,14 @@ var (
 
 // Options is a structure containing all the options that can be used when constructing a DHT.
 type Options struct {
-	Datastore    ds.Batching
-	Validator    record.Validator
-	Client       bool
-	Protocols    []protocol.ID
-	BucketSize   int
-	MaxRecordAge time.Duration
+	Datastore       ds.Batching
+	Validator       record.Validator
+	Client          bool
+	Protocols       []protocol.ID
+	BucketSize      int
+	MaxRecordAge    time.Duration
+	EnableProviders bool
+	EnableValues    bool
 
 	RoutingTable struct {
 		RefreshQueryTimeout time.Duration
@@ -56,6 +58,8 @@ var Defaults = func(o *Options) error {
 	}
 	o.Datastore = dssync.MutexWrap(ds.NewMapDatastore())
 	o.Protocols = DefaultProtocols
+	o.EnableProviders = true
+	o.EnableValues = true
 
 	o.RoutingTable.RefreshQueryTimeout = 10 * time.Second
 	o.RoutingTable.RefreshPeriod = 1 * time.Hour
@@ -177,3 +181,23 @@ func DisableAutoRefresh() Option {
 		return nil
 	}
 }
+
+// EnableProviders enables storing and retrieving provider records.
+//
+// Defaults to true.
+func EnableProviders(enable bool) Option {
+	return func(o *Options) error {
+		o.EnableProviders = enable
+		return nil
+	}
+}
+
+// EnableValues enables storing and retrieving value records.
+//
+// Defaults to true.
+func EnableValues(enable bool) Option {
+	return func(o *Options) error {
+		o.EnableValues = enable
+		return nil
+	}
+}

records_test.go

@@ -3,6 +3,7 @@ package dht
 import (
 	"context"
 	"crypto/rand"
+	"fmt"
 	"github.com/libp2p/go-libp2p-core/test"
 	"testing"
 	"time"
@@ -13,6 +14,8 @@ import (
 	"github.com/libp2p/go-libp2p-core/routing"
 	record "github.com/libp2p/go-libp2p-record"
 	tnet "github.com/libp2p/go-libp2p-testing/net"
+
+	dhtopt "github.com/libp2p/go-libp2p-kad-dht/opts"
 )
 
 // Check that GetPublicKey() correctly extracts a public key
@@ -305,3 +308,65 @@ func TestPubkeyGoodKeyFromDHTGoodKeyDirect(t *testing.T) {
 		t.Fatal("got incorrect public key")
 	}
 }
+
+func TestValuesDisabled(t *testing.T) {
+	for i := 0; i < 3; i++ {
+		enabledA := (i & 0x1) > 0
+		enabledB := (i & 0x2) > 0
+		t.Run(fmt.Sprintf("a=%v/b=%v", enabledA, enabledB), func(t *testing.T) {
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+
+			dhtA := setupDHT(ctx, t, false, dhtopt.EnableValues(enabledA))
+			dhtB := setupDHT(ctx, t, false, dhtopt.EnableValues(enabledB))
+
+			defer dhtA.Close()
+			defer dhtB.Close()
+			defer dhtA.host.Close()
+			defer dhtB.host.Close()
+
+			connect(t, ctx, dhtA, dhtB)
+
+			pubk := dhtB.peerstore.PubKey(dhtB.self)
+			pkbytes, err := pubk.Bytes()
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			pkkey := routing.KeyForPublicKey(dhtB.self)
+			err = dhtB.PutValue(ctx, pkkey, pkbytes)
+			if enabledB {
+				if err != nil {
+					t.Fatal("put should have succeeded on node B", err)
+				}
+			} else {
+				if err != routing.ErrNotSupported {
+					t.Fatal("should not have put the value to node B", err)
+				}
+				_, err = dhtB.GetValue(ctx, pkkey)
+				if err != routing.ErrNotSupported {
+					t.Fatal("get should have failed on node B")
+				}
+				rec, _ := dhtB.getLocal(pkkey)
+				if rec != nil {
+					t.Fatal("node B should not have found the value locally")
+				}
+			}
+
+			_, err = dhtA.GetValue(ctx, pkkey)
+			if enabledA {
+				if err != routing.ErrNotFound {
+					t.Fatal("node A should not have found the value")
+				}
+			} else {
+				if err != routing.ErrNotSupported {
+					t.Fatal("node A should not have found the value")
+				}
+			}
+			rec, _ := dhtA.getLocal(pkkey)
+			if rec != nil {
+				t.Fatal("node A should not have found the value locally")
+			}
+		})
+	}
+}

routing.go

@@ -34,6 +34,10 @@ var asyncQueryBuffer = 10
 // PutValue adds value corresponding to given Key.
 // This is the top level "Store" operation of the DHT
 func (dht *IpfsDHT) PutValue(ctx context.Context, key string, value []byte, opts ...routing.Option) (err error) {
+	if !dht.enableValues {
+		return routing.ErrNotSupported
+	}
+
 	eip := logger.EventBegin(ctx, "PutValue")
 	defer func() {
 		eip.Append(loggableKey(key))
@@ -110,6 +114,10 @@ type RecvdVal struct {
 
 // GetValue searches for the value corresponding to given Key.
 func (dht *IpfsDHT) GetValue(ctx context.Context, key string, opts ...routing.Option) (_ []byte, err error) {
+	if !dht.enableValues {
+		return nil, routing.ErrNotSupported
+	}
+
 	eip := logger.EventBegin(ctx, "GetValue")
 	defer func() {
 		eip.Append(loggableKey(key))
@@ -148,6 +156,10 @@ func (dht *IpfsDHT) GetValue(ctx context.Context, key string, opts ...routing.Op
 }
 
 func (dht *IpfsDHT) SearchValue(ctx context.Context, key string, opts ...routing.Option) (<-chan []byte, error) {
+	if !dht.enableValues {
+		return nil, routing.ErrNotSupported
+	}
+
 	var cfg routing.Options
 	if err := cfg.Apply(opts...); err != nil {
 		return nil, err
@@ -250,8 +262,11 @@ func (dht *IpfsDHT) SearchValue(ctx context.Context, key string, opts ...routing
 
 // GetValues gets nvals values corresponding to the given key.
 func (dht *IpfsDHT) GetValues(ctx context.Context, key string, nvals int) (_ []RecvdVal, err error) {
-	eip := logger.EventBegin(ctx, "GetValues")
+	if !dht.enableValues {
+		return nil, routing.ErrNotSupported
+	}
 
+	eip := logger.EventBegin(ctx, "GetValues")
 	eip.Append(loggableKey(key))
 	defer eip.Done()
 
@@ -398,6 +413,9 @@ func (dht *IpfsDHT) getValues(ctx context.Context, key string, nvals int) (<-cha
 
 // Provide makes this node announce that it can provide a value for the given key
 func (dht *IpfsDHT) Provide(ctx context.Context, key cid.Cid, brdcst bool) (err error) {
+	if !dht.enableProviders {
+		return routing.ErrNotSupported
+	}
 	eip := logger.EventBegin(ctx, "Provide", key, logging.LoggableMap{"broadcast": brdcst})
 	defer func() {
 		if err != nil {
@@ -477,6 +495,9 @@ func (dht *IpfsDHT) makeProvRecord(skey cid.Cid) (*pb.Message, error) {
 
 // FindProviders searches until the context expires.
 func (dht *IpfsDHT) FindProviders(ctx context.Context, c cid.Cid) ([]peer.AddrInfo, error) {
+	if !dht.enableProviders {
+		return nil, routing.ErrNotSupported
+	}
 	var providers []peer.AddrInfo
 	for p := range dht.FindProvidersAsync(ctx, c, dht.bucketSize) {
 		providers = append(providers, p)
@@ -488,6 +509,10 @@ func (dht *IpfsDHT) FindProviders(ctx context.Context, c cid.Cid) ([]peer.AddrIn
 // Peers will be returned on the channel as soon as they are found, even before
 // the search query completes.
 func (dht *IpfsDHT) FindProvidersAsync(ctx context.Context, key cid.Cid, count int) <-chan peer.AddrInfo {
+	if !dht.enableProviders {
+		return nil
+	}
+
 	logger.Event(ctx, "findProviders", key)
 	peerOut := make(chan peer.AddrInfo, count)