routing: rework interfaces to make separation easier

exchange/bitswap/network/ipfs_impl.go

@@ -20,7 +20,7 @@ import (
 var log = logging.Logger("bitswap_network")
 
 // NewFromIpfsHost returns a BitSwapNetwork supported by underlying IPFS host
-func NewFromIpfsHost(host host.Host, r routing.IpfsRouting) BitSwapNetwork {
+func NewFromIpfsHost(host host.Host, r routing.ContentRouting) BitSwapNetwork {
 	bitswapNetwork := impl{
 		host:    host,
 		routing: r,
@@ -36,7 +36,7 @@ func NewFromIpfsHost(host host.Host, r routing.IpfsRouting) BitSwapNetwork {
 // NetMessage objects, into the bitswap network interface.
 type impl struct {
 	host    host.Host
-	routing routing.IpfsRouting
+	routing routing.ContentRouting
 
 	// inbound messages from the network are forwarded to the receiver
 	receiver Receiver

exchange/reprovide/reprovide.go

@@ -15,13 +15,13 @@ var log = logging.Logger("reprovider")
 
 type Reprovider struct {
 	// The routing system to provide values through
-	rsys routing.IpfsRouting
+	rsys routing.ContentRouting
 
 	// The backing store for blocks to be provided
 	bstore blocks.Blockstore
 }
 
-func NewReprovider(rsys routing.IpfsRouting, bstore blocks.Blockstore) *Reprovider {
+func NewReprovider(rsys routing.ContentRouting, bstore blocks.Blockstore) *Reprovider {
 	return &Reprovider{
 		rsys:   rsys,
 		bstore: bstore,

namesys/namesys.go

@@ -26,7 +26,7 @@ type mpns struct {
 }
 
 // NewNameSystem will construct the IPFS naming system based on Routing
-func NewNameSystem(r routing.IpfsRouting, ds ds.Datastore, cachesize int) NameSystem {
+func NewNameSystem(r routing.ValueStore, ds ds.Datastore, cachesize int) NameSystem {
 	return &mpns{
 		resolvers: map[string]resolver{
 			"dns":      newDNSResolver(),

namesys/publisher.go

@@ -37,12 +37,12 @@ var PublishPutValTimeout = time.Minute
 // ipnsPublisher is capable of publishing and resolving names to the IPFS
 // routing system.
 type ipnsPublisher struct {
-	routing routing.IpfsRouting
+	routing routing.ValueStore
 	ds      ds.Datastore
 }
 
 // NewRoutingPublisher constructs a publisher for the IPFS Routing name system.
-func NewRoutingPublisher(route routing.IpfsRouting, ds ds.Datastore) *ipnsPublisher {
+func NewRoutingPublisher(route routing.ValueStore, ds ds.Datastore) *ipnsPublisher {
 	if ds == nil {
 		panic("nil datastore")
 	}
@@ -134,7 +134,7 @@ func checkCtxTTL(ctx context.Context) (time.Duration, bool) {
 	return d, ok
 }
 
-func PutRecordToRouting(ctx context.Context, k ci.PrivKey, value path.Path, seqnum uint64, eol time.Time, r routing.IpfsRouting, id peer.ID) error {
+func PutRecordToRouting(ctx context.Context, k ci.PrivKey, value path.Path, seqnum uint64, eol time.Time, r routing.ValueStore, id peer.ID) error {
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
@@ -181,7 +181,7 @@ func waitOnErrChan(ctx context.Context, errs chan error) error {
 	}
 }
 
-func PublishPublicKey(ctx context.Context, r routing.IpfsRouting, k key.Key, pubk ci.PubKey) error {
+func PublishPublicKey(ctx context.Context, r routing.ValueStore, k key.Key, pubk ci.PubKey) error {
 	log.Debugf("Storing pubkey at: %s", k)
 	pkbytes, err := pubk.Bytes()
 	if err != nil {
@@ -199,7 +199,7 @@ func PublishPublicKey(ctx context.Context, r routing.IpfsRouting, k key.Key, pub
 	return nil
 }
 
-func PublishEntry(ctx context.Context, r routing.IpfsRouting, ipnskey key.Key, rec *pb.IpnsEntry) error {
+func PublishEntry(ctx context.Context, r routing.ValueStore, ipnskey key.Key, rec *pb.IpnsEntry) error {
 	timectx, cancel := context.WithTimeout(ctx, PublishPutValTimeout)
 	defer cancel()
 

namesys/republisher/repub.go

@@ -31,7 +31,7 @@ var DefaultRebroadcastInterval = time.Hour * 4
 const DefaultRecordLifetime = time.Hour * 24
 
 type Republisher struct {
-	r  routing.IpfsRouting
+	r  routing.ValueStore
 	ds ds.Datastore
 	ps pstore.Peerstore
 
@@ -44,7 +44,7 @@ type Republisher struct {
 	entries   map[peer.ID]struct{}
 }
 
-func NewRepublisher(r routing.IpfsRouting, ds ds.Datastore, ps pstore.Peerstore) *Republisher {
+func NewRepublisher(r routing.ValueStore, ds ds.Datastore, ps pstore.Peerstore) *Republisher {
 	return &Republisher{
 		r:              r,
 		ps:             ps,

namesys/routing.go

@@ -23,7 +23,7 @@ var log = logging.Logger("namesys")
 
 // routingResolver implements NSResolver for the main IPFS SFS-like naming
 type routingResolver struct {
-	routing routing.IpfsRouting
+	routing routing.ValueStore
 
 	cache *lru.Cache
 }
@@ -88,7 +88,7 @@ type cacheEntry struct {
 // to implement SFS-like naming on top.
 // cachesize is the limit of the number of entries in the lru cache. Setting it
 // to '0' will disable caching.
-func NewRoutingResolver(route routing.IpfsRouting, cachesize int) *routingResolver {
+func NewRoutingResolver(route routing.ValueStore, cachesize int) *routingResolver {
 	if route == nil {
 		panic("attempt to create resolver with nil routing system")
 	}

routing/routing.go

@@ -14,11 +14,27 @@ import (
 // ErrNotFound is returned when a search fails to find anything
 var ErrNotFound = errors.New("routing: not found")
 
-// IpfsRouting is the routing module interface
-// It is implemented by things like DHTs, etc.
-type IpfsRouting interface {
+// ContentRouting is a value provider layer of indirection. It is used to find
+// information about who has what content.
+type ContentRouting interface {
+	// Announce that this node can provide value for given key
+	Provide(context.Context, key.Key) error
+
+	// Search for peers who are able to provide a given key
 	FindProvidersAsync(context.Context, key.Key, int) <-chan pstore.PeerInfo
+}
+
+// PeerRouting is a way to find information about certain peers.
+// This can be implemented by a simple lookup table, a tracking server,
+// or even a DHT.
+type PeerRouting interface {
+	// Find specific Peer
+	// FindPeer searches for a peer with given ID, returns a pstore.PeerInfo
+	// with relevant addresses.
+	FindPeer(context.Context, peer.ID) (pstore.PeerInfo, error)
+}
 
+type ValueStore interface {
 	// Basic Put/Get
 
 	// PutValue adds value corresponding to given Key.
@@ -38,17 +54,15 @@ type IpfsRouting interface {
 	// As a result, a value of '1' is mostly useful for cases where the record
 	// in question has only one valid value (such as public keys)
 	GetValues(c context.Context, k key.Key, count int) ([]RecvdVal, error)
+}
 
-	// Value provider layer of indirection.
-	// This is what DSHTs (Coral and MainlineDHT) do to store large values in a DHT.
-
-	// Announce that this node can provide value for given key
-	Provide(context.Context, key.Key) error
-
-	// Find specific Peer
-	// FindPeer searches for a peer with given ID, returns a pstore.PeerInfo
-	// with relevant addresses.
-	FindPeer(context.Context, peer.ID) (pstore.PeerInfo, error)
+// IpfsRouting is the combination of different routing types that ipfs
+// uses. It can be satisfied by a single item (such as a DHT) or multiple
+// different pieces that are more optimized to each task.
+type IpfsRouting interface {
+	ContentRouting
+	PeerRouting
+	ValueStore
 
 	// Bootstrap allows callers to hint to the routing system to get into a
 	// Boostrapped state
@@ -74,7 +88,7 @@ func KeyForPublicKey(id peer.ID) key.Key {
 	return key.Key("/pk/" + string(id))
 }
 
-func GetPublicKey(r IpfsRouting, ctx context.Context, pkhash []byte) (ci.PubKey, error) {
+func GetPublicKey(r ValueStore, ctx context.Context, pkhash []byte) (ci.PubKey, error) {
 	if dht, ok := r.(PubKeyFetcher); ok {
 		// If we have a DHT as our routing system, use optimized fetcher
 		return dht.GetPublicKey(ctx, peer.ID(pkhash))