Add v2 network package

network/v2/multi_network.go

@@ -0,0 +1,70 @@
+package network
+
+import (
+	"context"
+	"errors"
+	"math/rand"
+	"net"
+	"net/http"
+
+	"github.com/9seconds/mtg/v2/essentials"
+)
+
+type multiNetwork struct {
+	networks []Network
+}
+
+func (m multiNetwork) Dial(network, address string) (essentials.Conn, error) {
+	return m.DialContext(context.Background(), network, address)
+}
+
+func (m multiNetwork) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
+	networks := m.networks
+
+	if len(networks) > 1 {
+		networks = make([]Network, len(m.networks))
+		copy(networks, m.networks)
+
+		rand.Shuffle(len(m.networks), func(i, j int) {
+			networks[i], networks[j] = networks[j], networks[i]
+		})
+	}
+
+	errs := make([]error, 1, len(networks)+1)
+	errs[0] = ErrCannotDial
+
+	for _, ntw := range networks {
+		conn, err := ntw.DialContext(ctx, network, address)
+		if err == nil {
+			return conn, nil
+		}
+
+		errs = append(errs, err)
+	}
+
+	return nil, errors.Join(errs...)
+}
+
+func (m multiNetwork) NativeDialer() *net.Dialer {
+	return m.networks[0].NativeDialer()
+}
+
+func (m multiNetwork) MakeHTTPClient(
+	dialFunc func(context.Context, string, string) (essentials.Conn, error),
+) *http.Client {
+	if dialFunc == nil {
+		dialFunc = m.DialContext
+	}
+
+	return m.networks[0].MakeHTTPClient(dialFunc)
+}
+
+func Join(networks ...Network) (Network, error) {
+	if len(networks) == 0 {
+		return nil, errors.New("cannot join no networks")
+	}
+
+	return multiNetwork{
+		networks: networks,
+	}, nil
+}