routing/http: add more type and WithDynamicProviderInfo

routing/http/client/client.go

@@ -8,6 +8,7 @@
 	"fmt"
 	"mime"
 	"net/http"
+	"net/url"
 	"strings"
 	"time"
 
@@ -54,7 +55,7 @@
 	accepts string
 
 	peerID   peer.ID
-	addrs    []types.Multiaddr
+	addrs    func() ([]types.Multiaddr, error)
 	identity crypto.PrivKey
 
 	// called immeidately after signing a provide req
@@ -104,10 +105,37 @@
 }
 
 func WithProviderInfo(peerID peer.ID, addrs []multiaddr.Multiaddr) Option {
+	taddrs := make([]types.Multiaddr, len(addrs))
+	for i, v := range addrs {
+		taddrs[i] = types.Multiaddr{Multiaddr: v}
+	}
+
 	return func(c *client) {
 		c.peerID = peerID
-		for _, a := range addrs {
-			c.addrs = append(c.addrs, types.Multiaddr{Multiaddr: a})
+		c.addrs = func() ([]types.Multiaddr, error) {
+			return taddrs, nil
+		}
+	}
+}
+
+// WithDynamicProviderInfo is like [WithProviderInfo] but the addresses will be queried on each publish operation.
+// This is usefull for nodes with changing addresses, like P2P daemons behind NATs.
+// Note: due to API limitations can't trivially batch update previous records with new addresses, so you are still relient
+// on an consumers using a PeerRouter able to follow your new addresses, for example the IPFS DHT.
+func WithDynamicProviderInfo(peerID peer.ID, addrs func() ([]multiaddr.Multiaddr, error)) Option {
+	return func(c *client) {
+		c.peerID = peerID
+		c.addrs = func() ([]types.Multiaddr, error) {
+			addrs, err := addrs()
+			if err != nil {
+				return nil, err
+			}
+
+			taddrs := make([]types.Multiaddr, len(addrs))
+			for i, v := range addrs {
+				taddrs[i] = types.Multiaddr{Multiaddr: v}
+			}
+			return taddrs, nil
 		}
 	}
 }
@@ -120,6 +148,7 @@
 
 // New creates a content routing API client.
 // The Provider and identity parameters are option. If they are nil, the `Provide` method will not function.
+// Consider using the more type-safe option [NewURL].
 func New(baseURL string, opts ...Option) (*client, error) {
 	client := &client{
 		baseURL:    baseURL,
@@ -140,6 +169,11 @@
 	return client, nil
 }
 
+// NewURL is a more type-safe version of [New], it takes in an [url.URL].
+func NewURL(baseURL url.URL, opts ...Option) (*client, error) {
+	return New(baseURL.String(), opts...)
+}
+
 // measuringIter measures the length of the iter and then publishes metrics about the whole req once the iter is closed.
 // Of course, if the caller forgets to close the iter, this won't publish anything.
 type measuringIter[T any] struct {
@@ -251,6 +285,11 @@
 
 	now := c.clock.Now()
 
+	addrs, err := c.addrs()
+	if err != nil {
+		return 0, fmt.Errorf("failed to query our addresses: %w", err)
+	}
+
 	req := types.WriteBitswapProviderRecord{
 		Protocol: "transport-bitswap",
 		Schema:   types.SchemaBitswap,
@@ -259,10 +298,10 @@
 			AdvisoryTTL: &types.Duration{Duration: ttl},
 			Timestamp:   &types.Time{Time: now},
 			ID:          &c.peerID,
-			Addrs:       c.addrs,
+			Addrs:       addrs,
 		},
 	}
-	err := req.Sign(c.peerID, c.identity)
+	err = req.Sign(c.peerID, c.identity)
 	if err != nil {
 		return 0, err
 	}

routing/http/client/client_test.go

@@ -144,7 +144,7 @@ func drAddrsToAddrs(drmas []types.Multiaddr) (addrs []multiaddr.Multiaddr) {
 	return
 }
 
-func makeBSReadProviderResp() types.ReadBitswapProviderRecord {
+func makeBSReadProviderResp(t *testing.T) types.ReadBitswapProviderRecord {
 	peerID, addrs, _ := makeProviderAndIdentity()
 	return types.ReadBitswapProviderRecord{
 		Protocol: "transport-bitswap",
@@ -194,7 +194,7 @@ func (e *osErrContains) errContains(t *testing.T, err error) {
 }
 
 func TestClient_FindProviders(t *testing.T) {
-	bsReadProvResp := makeBSReadProviderResp()
+	bsReadProvResp := makeBSReadProviderResp(t)
 	bitswapProvs := []iter.Result[types.ProviderResponse]{
 		{Val: &bsReadProvResp},
 	}
@@ -412,11 +412,18 @@ func TestClient_Provide(t *testing.T) {
 				}
 			}
 
+			var addrs []types.Multiaddr
+			if f := client.addrs; f != nil {
+				var err error
+				addrs, err = client.addrs()
+				require.NoError(t, err)
+			}
+
 			expectedProvReq := &server.BitswapWriteProvideRequest{
 				Keys:        c.cids,
 				Timestamp:   clock.Now().Truncate(time.Millisecond),
 				AdvisoryTTL: c.ttl,
-				Addrs:       drAddrsToAddrs(client.addrs),
+				Addrs:       drAddrsToAddrs(addrs),
 				ID:          client.peerID,
 			}
 
@@ -442,3 +449,62 @@ func TestClient_Provide(t *testing.T) {
 		})
 	}
 }
+
+func TestWithDynamicClient(t *testing.T) {
+	t.Parallel()
+
+	const ttl = time.Hour
+
+	const testUserAgent = "testUserAgent"
+	peerID, addrs, identity := makeProviderAndIdentity()
+	router := &mockContentRouter{}
+	recordingHandler := &recordingHandler{
+		Handler: server.Handler(router),
+		f: []func(*http.Request){
+			func(r *http.Request) {
+				assert.Equal(t, testUserAgent, r.Header.Get("User-Agent"))
+			},
+		},
+	}
+	srv := httptest.NewServer(recordingHandler)
+	t.Cleanup(srv.Close)
+	serverAddr := "http://" + srv.Listener.Addr().String()
+	recordingHTTPClient := &recordingHTTPClient{httpClient: defaultHTTPClient}
+	var rAddrs []multiaddr.Multiaddr
+	client, err := New(serverAddr,
+		WithDynamicProviderInfo(peerID, func() ([]multiaddr.Multiaddr, error) { return rAddrs, nil }),
+		WithIdentity(identity),
+		WithUserAgent(testUserAgent),
+		WithHTTPClient(recordingHTTPClient),
+	)
+	require.NoError(t, err)
+
+	c := makeCID()
+	rAddrs = addrs[:1]
+
+	clock := clock.NewMock()
+	clock.Set(time.Now())
+	client.clock = clock
+
+	expectedProvReq := &server.BitswapWriteProvideRequest{
+		Keys:        []cid.Cid{c},
+		Timestamp:   clock.Now().Truncate(time.Millisecond),
+		AdvisoryTTL: ttl,
+		Addrs:       rAddrs,
+		ID:          peerID,
+	}
+	router.On("ProvideBitswap", mock.Anything, expectedProvReq).Return(ttl, nil)
+
+	ctx := context.Background()
+	_, err = client.ProvideBitswap(ctx, []cid.Cid{c}, ttl)
+	require.NoError(t, err)
+
+	c = makeCID()
+	rAddrs = addrs[1:]
+
+	expectedProvReq.Keys[0] = c
+	expectedProvReq.Addrs = rAddrs
+
+	_, err = client.ProvideBitswap(ctx, []cid.Cid{c}, ttl)
+	require.NoError(t, err)
+}

routing/http/contentrouter/contentrouter.go

@@ -124,9 +124,9 @@
 				continue
 			}
 
-			var addrs []multiaddr.Multiaddr
-			for _, a := range result.Addrs {
-				addrs = append(addrs, a.Multiaddr)
+			addrs := make([]multiaddr.Multiaddr, len(result.Addrs))
+			for i, a := range result.Addrs {
+				addrs[i] = a.Multiaddr
 			}
 
 			ch <- peer.AddrInfo{

routing/http/contentrouter/contentrouter_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/ipfs/boxo/routing/http/types/iter"
 	"github.com/ipfs/go-cid"
 	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/multiformats/go-multiaddr"
 	"github.com/multiformats/go-multihash"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
@@ -135,8 +136,8 @@ func TestFindProvidersAsync(t *testing.T) {
 	}
 
 	expected := []peer.AddrInfo{
-		{ID: p1},
-		{ID: p2},
+		{ID: p1, Addrs: []multiaddr.Multiaddr{}},
+		{ID: p2, Addrs: []multiaddr.Multiaddr{}},
 	}
 
 	require.Equal(t, expected, actualAIs)

routing/http/internal/drjson/json.go

@@ -5,22 +5,22 @@ import (
 	"encoding/json"
 )
 
-func marshalJSON(val any) (*bytes.Buffer, error) {
+func marshalJSON(val any) ([]byte, error) {
 	buf := &bytes.Buffer{}
 	enc := json.NewEncoder(buf)
 	enc.SetEscapeHTML(false)
 	err := enc.Encode(val)
-	return buf, err
+	return buf.Bytes(), err
 }
 
 // MarshalJSONBytes is needed to avoid changes
 // on the original bytes due to HTML escapes.
 func MarshalJSONBytes(val any) ([]byte, error) {
-	buf, err := marshalJSON(val)
+	bytes, err := marshalJSON(val)
 	if err != nil {
 		return nil, err
 	}
 
 	// remove last \n added by Encode
-	return buf.Bytes()[:buf.Len()-1], nil
+	return bytes[:len(bytes)-1], nil
 }