feat: Expose the ProviderManager through the IpfsDht struct (#491)

* feat: Expose the ProviderManager through the IpfsDht struct
* feat: expose providers prefix so that we do not have to hard code it in other places
Co-authored-by: Aarsh Shah <aarshkshah1992@gmail.com>

dht.go

@@ -49,7 +49,8 @@ type IpfsDHT struct {
 	datastore ds.Datastore // Local data
 
 	routingTable *kb.RoutingTable // Array of routing tables for differently distanced nodes
-	providers    *providers.ProviderManager
+	// ProviderManager stores & manages the provider records for this Dht peer.
+	ProviderManager *providers.ProviderManager
 
 	birth time.Time // When this peer started up
 
@@ -111,7 +112,7 @@ func New(ctx context.Context, h host.Host, options ...opts.Option) (*IpfsDHT, er
 	// register for network notifs.
 	dht.host.Network().Notify((*netNotifiee)(dht))
 
-	dht.proc.AddChild(dht.providers.Process())
+	dht.proc.AddChild(dht.ProviderManager.Process())
 	dht.Validator = cfg.Validator
 
 	if !cfg.Client {
@@ -185,7 +186,7 @@ func makeDHT(ctx context.Context, h host.Host, cfg *opts.Options) *IpfsDHT {
 	// the DHT context should be done when the process is closed
 	dht.ctx = goprocessctx.WithProcessClosing(ctxTags, dht.proc)
 
-	dht.providers = providers.NewProviderManager(dht.ctx, h.ID(), cfg.Datastore)
+	dht.ProviderManager = providers.NewProviderManager(dht.ctx, h.ID(), cfg.Datastore)
 
 	return dht
 }

dht_test.go

@@ -30,7 +30,7 @@ import (
 	"github.com/ipfs/go-cid"
 	u "github.com/ipfs/go-ipfs-util"
 	kb "github.com/libp2p/go-libp2p-kbucket"
-	"github.com/libp2p/go-libp2p-record"
+	record "github.com/libp2p/go-libp2p-record"
 	swarmt "github.com/libp2p/go-libp2p-swarm/testing"
 	"github.com/libp2p/go-libp2p-testing/ci"
 	travisci "github.com/libp2p/go-libp2p-testing/ci/travis"
@@ -677,7 +677,7 @@ func TestLocalProvides(t *testing.T) {
 
 	for _, c := range testCaseCids {
 		for i := 0; i < 3; i++ {
-			provs := dhts[i].providers.GetProviders(ctx, c.Hash())
+			provs := dhts[i].ProviderManager.GetProviders(ctx, c.Hash())
 			if len(provs) > 0 {
 				t.Fatal("shouldnt know this")
 			}
@@ -1418,7 +1418,7 @@ func TestClientModeConnect(t *testing.T) {
 
 	c := testCaseCids[0]
 	p := peer.ID("TestPeer")
-	a.providers.AddProvider(ctx, c.Hash(), p)
+	a.ProviderManager.AddProvider(ctx, c.Hash(), p)
 	time.Sleep(time.Millisecond * 5) // just in case...
 
 	provs, err := b.FindProviders(ctx, c)
@@ -1633,7 +1633,7 @@ func TestProvideDisabled(t *testing.T) {
 				if err != routing.ErrNotSupported {
 					t.Fatal("get should have failed on node B")
 				}
-				provs := dhtB.providers.GetProviders(ctx, kHash)
+				provs := dhtB.ProviderManager.GetProviders(ctx, kHash)
 				if len(provs) != 0 {
 					t.Fatal("node B should not have found local providers")
 				}
@@ -1649,7 +1649,7 @@ func TestProvideDisabled(t *testing.T) {
 					t.Fatal("node A should not have found providers")
 				}
 			}
-			provAddrs := dhtA.providers.GetProviders(ctx, kHash)
+			provAddrs := dhtA.ProviderManager.GetProviders(ctx, kHash)
 			if len(provAddrs) != 0 {
 				t.Fatal("node A should not have found local providers")
 			}

handlers.go

@@ -335,7 +335,7 @@ func (dht *IpfsDHT) handleGetProviders(ctx context.Context, p peer.ID, pmes *pb.
 	}
 
 	// setup providers
-	providers := dht.providers.GetProviders(ctx, key)
+	providers := dht.ProviderManager.GetProviders(ctx, key)
 	if has {
 		providers = append(providers, dht.self)
 		logger.Debugf("%s have the value. added self as provider", reqDesc)
@@ -393,7 +393,7 @@ func (dht *IpfsDHT) handleAddProvider(ctx context.Context, p peer.ID, pmes *pb.M
 			// add the received addresses to our peerstore.
 			dht.peerstore.AddAddrs(pi.ID, pi.Addrs, peerstore.ProviderAddrTTL)
 		}
-		dht.providers.AddProvider(ctx, key, p)
+		dht.ProviderManager.AddProvider(ctx, key, p)
 	}
 
 	return nil, nil

providers/providers.go

@@ -73,10 +73,12 @@ func NewProviderManager(ctx context.Context, local peer.ID, dstore ds.Batching)
 	return pm
 }
 
-const providersKeyPrefix = "/providers/"
+// ProvidersKeyPrefix is the prefix/namespace for ALL provider record
+// keys stored in the data store.
+const ProvidersKeyPrefix = "/providers/"
 
 func mkProvKey(k []byte) string {
-	return providersKeyPrefix + base32.RawStdEncoding.EncodeToString(k)
+	return ProvidersKeyPrefix + base32.RawStdEncoding.EncodeToString(k)
 }
 
 func (pm *ProviderManager) Process() goprocess.Process {
@@ -283,7 +285,7 @@ func (pm *ProviderManager) run(proc goprocess.Process) {
 
 			// Now, kick off a GC of the datastore.
 			q, err := pm.dstore.Query(dsq.Query{
-				Prefix: providersKeyPrefix,
+				Prefix: ProvidersKeyPrefix,
 			})
 			if err != nil {
 				log.Error("provider record GC query failed: ", err)

providers/providers_test.go

@@ -186,7 +186,7 @@ func TestProvidesExpire(t *testing.T) {
 		t.Fatal("providers map not cleaned up")
 	}
 
-	res, err := ds.Query(dsq.Query{Prefix: providersKeyPrefix})
+	res, err := ds.Query(dsq.Query{Prefix: ProvidersKeyPrefix})
 	if err != nil {
 		t.Fatal(err)
 	}

routing.go

@@ -426,7 +426,7 @@ func (dht *IpfsDHT) Provide(ctx context.Context, key cid.Cid, brdcst bool) (err
 	}()
 
 	// add self locally
-	dht.providers.AddProvider(ctx, keyMH, dht.self)
+	dht.ProviderManager.AddProvider(ctx, keyMH, dht.self)
 	if !brdcst {
 		return nil
 	}
@@ -528,7 +528,7 @@ func (dht *IpfsDHT) findProvidersAsyncRoutine(ctx context.Context, key multihash
 	defer close(peerOut)
 
 	ps := peer.NewLimitedSet(count)
-	provs := dht.providers.GetProviders(ctx, key)
+	provs := dht.ProviderManager.GetProviders(ctx, key)
 	for _, p := range provs {
 		// NOTE: Assuming that this list of peers is unique
 		if ps.TryAdd(p) {