feat: initial commit

reach/client/protocol/registry.go

@@ -0,0 +1,54 @@
+package protocol
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+)
+
+type Registry struct {
+	protocols map[Identifier]Protocol
+}
+
+func (r *Registry) Register(protocol Protocol) {
+	r.protocols[protocol.Identifier()] = protocol
+}
+
+func (r *Registry) Availables(ctx context.Context, addr string) ([]Protocol, error) {
+	availables := make([]Protocol, 0)
+
+	for _, proto := range r.protocols {
+		available, err := proto.Available(ctx, addr)
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		if !available {
+			continue
+		}
+
+		availables = append(availables, proto)
+	}
+
+	return availables, nil
+}
+
+func NewRegistry() *Registry {
+	return &Registry{
+		protocols: make(map[Identifier]Protocol),
+	}
+}
+
+var defaultRegistry = NewRegistry()
+
+func DefaultRegistry() *Registry {
+	return defaultRegistry
+}
+
+func Register(protocol Protocol) {
+	defaultRegistry.Register(protocol)
+}
+
+func Availables(ctx context.Context, addr string) ([]Protocol, error) {
+	return defaultRegistry.Availables(ctx, addr)
+}