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discovery.go
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discovery.go
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// Copyright 2020 Anapaya Systems
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grpc
import (
"context"
"net"
"github.com/scionproto/scion/pkg/experimental/hiddenpath"
"github.com/scionproto/scion/pkg/grpc"
libgrpc "github.com/scionproto/scion/pkg/grpc"
"github.com/scionproto/scion/pkg/private/serrors"
dspb "github.com/scionproto/scion/pkg/proto/discovery"
)
// Discoverer can be used to discover remote hidden path instances.
type Discoverer struct {
// Dialer dials a new gRPC connection.
Dialer libgrpc.Dialer
}
// Discover discovers hidden path services at the discovery service that is
// given by the address.
func (d *Discoverer) Discover(ctx context.Context, dsAddr net.Addr) (hiddenpath.Servers, error) {
conn, err := d.Dialer.Dial(ctx, dsAddr)
if err != nil {
return hiddenpath.Servers{}, serrors.WrapStr("dialing", err)
}
defer conn.Close()
client := dspb.NewDiscoveryServiceClient(conn)
r, err := client.HiddenSegmentServices(ctx, &dspb.HiddenSegmentServicesRequest{},
grpc.RetryProfile...)
if err != nil {
return hiddenpath.Servers{}, err
}
reply := hiddenpath.Servers{
Lookup: make([]*net.UDPAddr, 0, len(r.Lookup)),
Registration: make([]*net.UDPAddr, 0, len(r.Registration)),
}
parseUDPAddr := func(addr string) (*net.UDPAddr, error) {
a, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
if ip4 := a.IP.To4(); ip4 != nil {
a.IP = ip4
}
return a, nil
}
for _, l := range r.Lookup {
a, err := parseUDPAddr(l.Address)
if err != nil {
return hiddenpath.Servers{}, serrors.WrapStr("parsing address", err, "raw", l.Address)
}
reply.Lookup = append(reply.Lookup, a)
}
for _, l := range r.Registration {
a, err := parseUDPAddr(l.Address)
if err != nil {
return hiddenpath.Servers{}, serrors.WrapStr("parsing address", err, "raw", l.Address)
}
reply.Registration = append(reply.Registration, a)
}
return reply, nil
}