feat: Addresses.AppendAnnounce

core/node/groups.go

@@ -145,7 +145,7 @@ func LibP2P(bcfg *BuildCfg, cfg *config.Config) fx.Option {
 		BaseLibP2P,
 
 		fx.Provide(libp2p.AddrFilters(cfg.Swarm.AddrFilters)),
-		fx.Provide(libp2p.AddrsFactory(cfg.Addresses.Announce, cfg.Addresses.NoAnnounce)),
+		fx.Provide(libp2p.AddrsFactory(cfg.Addresses.Announce, cfg.Addresses.AppendAnnounce, cfg.Addresses.NoAnnounce)),
 		fx.Provide(libp2p.SmuxTransport(cfg.Swarm.Transports)),
 		fx.Provide(libp2p.RelayTransport(enableRelayTransport)),
 		fx.Provide(libp2p.RelayService(cfg.Swarm.RelayService.Enabled.WithDefault(true), cfg.Swarm.RelayService)),

core/node/libp2p/addrs.go

@@ -25,14 +25,30 @@ func AddrFilters(filters []string) func() (*ma.Filters, Libp2pOpts, error) {
 	}
 }
 
-func makeAddrsFactory(announce []string, noAnnounce []string) (p2pbhost.AddrsFactory, error) {
-	var annAddrs []ma.Multiaddr
-	for _, addr := range announce {
-		maddr, err := ma.NewMultiaddr(addr)
+func makeAddrsFactory(announce []string, appendAnnouce []string, noAnnounce []string) (p2pbhost.AddrsFactory, error) {
+	var err error                     // To assign to the slice in the for loop
+	existing := make(map[string]bool) // To avoid duplicates
+
+	annAddrs := make([]ma.Multiaddr, len(announce))
+	for i, addr := range announce {
+		annAddrs[i], err = ma.NewMultiaddr(addr)
+		if err != nil {
+			return nil, err
+		}
+		existing[addr] = true
+	}
+
+	var appendAnnAddrs []ma.Multiaddr
+	for _, addr := range appendAnnouce {
+		if existing[addr] {
+			// skip AppendAnnounce that is on the Announce list already
+			continue
+		}
+		appendAddr, err := ma.NewMultiaddr(addr)
 		if err != nil {
 			return nil, err
 		}
-		annAddrs = append(annAddrs, maddr)
+		appendAnnAddrs = append(appendAnnAddrs, appendAddr)
 	}
 
 	filters := ma.NewFilters()
@@ -57,6 +73,7 @@ func makeAddrsFactory(announce []string, noAnnounce []string) (p2pbhost.AddrsFac
 		} else {
 			addrs = allAddrs
 		}
+		addrs = append(addrs, appendAnnAddrs...)
 
 		var out []ma.Multiaddr
 		for _, maddr := range addrs {
@@ -71,9 +88,9 @@ func makeAddrsFactory(announce []string, noAnnounce []string) (p2pbhost.AddrsFac
 	}, nil
 }
 
-func AddrsFactory(announce []string, noAnnounce []string) func() (opts Libp2pOpts, err error) {
+func AddrsFactory(announce []string, appendAnnouce []string, noAnnounce []string) func() (opts Libp2pOpts, err error) {
 	return func() (opts Libp2pOpts, err error) {
-		addrsFactory, err := makeAddrsFactory(announce, noAnnounce)
+		addrsFactory, err := makeAddrsFactory(announce, appendAnnouce, noAnnounce)
 		if err != nil {
 			return opts, err
 		}

docs/config.md

@@ -21,6 +21,7 @@ config file at runtime.
     - [`Addresses.Gateway`](#addressesgateway)
     - [`Addresses.Swarm`](#addressesswarm)
     - [`Addresses.Announce`](#addressesannounce)
+    - [`Addresses.AppendAnnounce`](#addressesappendannounce)
     - [`Addresses.NoAnnounce`](#addressesnoannounce)
   - [`API`](#api)
     - [`API.HTTPHeaders`](#apihttpheaders)
@@ -336,8 +337,19 @@ Default: `[]`
 
 Type: `array[string]` (multiaddrs)
 
+### `Addresses.AppendAnnounce`
+
+Similar to [`Addresses.Announce`](#addressesannounce) except this doesn't
+override inferred swarm addresses if non-empty.
+
+Default: `[]`
+
+Type: `array[string]` (multiaddrs)
+
 ### `Addresses.NoAnnounce`
+
 An array of swarm addresses not to announce to the network.
+Takes precedence over `Addresses.Announce` and `Addresses.AppendAnnounce`.
 
 Default: `[]`
 

test/sharness/t0140-swarm.sh

@@ -65,18 +65,47 @@ test_expect_success 'Addresses.Announce affects addresses' '
 
 test_kill_ipfs_daemon
 
+
+announceCfg='["/ip4/127.0.0.1/tcp/4001", "/ip4/1.2.3.4/tcp/1234"]'
+test_expect_success "test_config_set succeeds" "
+  ipfs config --json Addresses.Announce '$announceCfg'
+"
+# Include "/ip4/1.2.3.4/tcp/1234" to ensure we deduplicate addrs already present in Swarm.Announce
+appendAnnounceCfg='["/dnsaddr/dynamic.example.com", "/ip4/10.20.30.40/tcp/4321", "/ip4/1.2.3.4/tcp/1234"]'
+test_expect_success "test_config_set Announce and AppendAnnounce succeeds" "
+  ipfs config --json Addresses.Announce '$announceCfg' &&
+  ipfs config --json Addresses.AppendAnnounce '$appendAnnounceCfg'
+"
+
+test_launch_ipfs_daemon
+
+test_expect_success 'Addresses.AppendAnnounce is applied on top of Announce' '
+  ipfs swarm addrs local >actual &&
+  grep "/ip4/1.2.3.4/tcp/1234" actual &&
+  grep "/dnsaddr/dynamic.example.com" actual &&
+  grep "/ip4/10.20.30.40/tcp/4321" actual &&
+  ipfs id -f"<addrs>" | xargs -n1 echo | tee actual &&
+  grep "/ip4/1.2.3.4/tcp/1234/p2p" actual &&
+  grep "/dnsaddr/dynamic.example.com/p2p/" actual &&
+  grep "/ip4/10.20.30.40/tcp/4321/p2p/" actual
+'
+
+test_kill_ipfs_daemon
+
 noAnnounceCfg='["/ip4/1.2.3.4/tcp/1234"]'
 test_expect_success "test_config_set succeeds" "
   ipfs config --json Addresses.NoAnnounce '$noAnnounceCfg'
 "
 
 test_launch_ipfs_daemon
 
-test_expect_success "Addresses.NoAnnounce affects addresses" '
+test_expect_success "Addresses.NoAnnounce affects addresses from Announce and AppendAnnounce" '
   ipfs swarm addrs local >actual &&
   grep -v "/ip4/1.2.3.4/tcp/1234" actual &&
+  grep -v "/ip4/10.20.30.40/tcp/4321" actual &&
   ipfs id -f"<addrs>" | xargs -n1 echo >actual &&
-  grep -v "/ip4/1.2.3.4/tcp/1234" actual
+  grep -v "/ip4/1.2.3.4/tcp/1234" actual &&
+  grep -v "//ip4/10.20.30.40/tcp/4321" actual
 '
 
 test_kill_ipfs_daemon