[#607] network: Do not return error from `Address.HostAddrString` method

Panic if internal `manet.DialArgs` call returns error since this is
unexpected according to `AddressFromString` implementation.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-cli/modules/root.go

@@ -257,13 +257,8 @@ func getSDKClient(key *ecdsa.PrivateKey) (client.Client, error) {
 		return nil, err
 	}
 
-	hostAddr, err := netAddr.HostAddrString()
-	if err != nil {
-		return nil, errInvalidEndpoint
-	}
-
 	options := []client.Option{
-		client.WithAddress(hostAddr),
+		client.WithAddress(netAddr.HostAddrString()),
 		client.WithDefaultPrivateKey(key),
 	}
 

pkg/network/address.go

@@ -64,13 +64,17 @@ func (a Address) IPAddrString() (string, error) {
 }
 
 // HostAddrString returns host address in string format.
-func (a Address) HostAddrString() (string, error) {
+//
+// Panics if host address cannot be fetched from Address.
+func (a Address) HostAddrString() string {
 	_, host, err := manet.DialArgs(a.ma)
 	if err != nil {
-		return "", fmt.Errorf("could not get host addr: %w", err)
+		// the only correct way to construct Address is AddressFromString
+		// which makes this error appear unexpected
+		panic(fmt.Errorf("could not get host addr: %w", err))
 	}
 
-	return host, nil
+	return host
 }
 
 // AddressFromString restores address from a string representation.

pkg/network/address_test.go

@@ -62,8 +62,7 @@ func TestAddress_HostAddrString(t *testing.T) {
 		for _, testcase := range testcases {
 			addr := Address{testcase.ma}
 
-			got, err := addr.HostAddrString()
-			require.NoError(t, err)
+			got := addr.HostAddrString()
 
 			require.Equal(t, testcase.exp, got)
 		}
@@ -76,8 +75,7 @@ func TestAddress_HostAddrString(t *testing.T) {
 
 		for _, testcase := range testcases {
 			addr := Address{testcase}
-			_, err := addr.HostAddrString()
-			require.Error(t, err)
+			require.Panics(t, func() { addr.HostAddrString() })
 		}
 	})
 }

pkg/network/cache/client.go

@@ -2,7 +2,6 @@ package cache
 
 import (
 	"crypto/tls"
-	"fmt"
 	"sync"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/client"
@@ -55,12 +54,7 @@ func (c *ClientCache) Get(netAddr *network.Address) (client.Client, error) {
 		return cli, nil
 	}
 
-	hostAddr, err := netAddr.HostAddrString()
-	if err != nil {
-		return nil, fmt.Errorf("could not parse address as a string: %w", err)
-	}
-
-	opts := append(c.opts, client.WithAddress(hostAddr))
+	opts := append(c.opts, client.WithAddress(netAddr.HostAddrString()))
 
 	if netAddr.TLSEnabled() {
 		opts = append(opts, client.WithTLSConfig(&tls.Config{}))

pkg/services/object/get/get_test.go

@@ -83,12 +83,7 @@ func (p *testPlacementBuilder) BuildPlacement(addr *objectSDK.Address, _ *netmap
 }
 
 func (c *testClientCache) get(mAddr *network.Address) (getClient, error) {
-	hostAddr, err := mAddr.HostAddrString()
-	if err != nil {
-		return nil, err
-	}
-
-	v, ok := c.clients[hostAddr]
+	v, ok := c.clients[mAddr.HostAddrString()]
 	if !ok {
 		return nil, errors.New("could not construct client")
 	}
@@ -415,8 +410,7 @@ func testNodeMatrix(t testing.TB, dim []int) ([]netmap.Nodes, [][]string) {
 			na, err := network.AddressFromString(a)
 			require.NoError(t, err)
 
-			as[j], err = na.HostAddrString()
-			require.NoError(t, err)
+			as[j] = na.HostAddrString()
 
 			ni := netmap.NewNodeInfo()
 			ni.SetAddress(a)

pkg/services/object/search/search_test.go

@@ -85,12 +85,7 @@ func (p *testPlacementBuilder) BuildPlacement(addr *objectSDK.Address, _ *netmap
 }
 
 func (c *testClientCache) get(mAddr *network.Address) (searchClient, error) {
-	hostAddr, err := mAddr.HostAddrString()
-	if err != nil {
-		return nil, err
-	}
-
-	v, ok := c.clients[hostAddr]
+	v, ok := c.clients[mAddr.HostAddrString()]
 	if !ok {
 		return nil, errors.New("could not construct client")
 	}
@@ -209,8 +204,7 @@ func testNodeMatrix(t testing.TB, dim []int) ([]netmap.Nodes, [][]string) {
 			na, err := network.AddressFromString(a)
 			require.NoError(t, err)
 
-			as[j], err = na.HostAddrString()
-			require.NoError(t, err)
+			as[j] = na.HostAddrString()
 
 			ni := netmap.NewNodeInfo()
 			ni.SetAddress(a)