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|
package relay
import (
"context"
"fmt"
"sync"
pb "github.com/boozec/rahanna/relay/proto"
)
type Server struct {
pb.UnimplementedRelayServer
}
type name string
// TODO: use pair of ips and ports
type ips struct {
ip0 string
ip1 string
}
var mu sync.Mutex
// Map each name to a pair of IPs
var table = make(map[name]ips)
func (s *Server) RegisterName(ctx context.Context, in *pb.RelayRequest) (*pb.RelayResponse, error) {
mu.Lock()
defer mu.Unlock()
if in.Ip == "" {
return nil, fmt.Errorf("IP address cannot be empty")
}
sessionName := NewSession()
for {
if _, ok := table[name(sessionName)]; !ok {
break
}
sessionName = NewSession()
}
table[name(sessionName)] = ips{ip0: in.Ip, ip1: ""}
return &pb.RelayResponse{Name: sessionName, Ip: in.Ip}, nil
}
func (s *Server) Lookup(ctx context.Context, in *pb.LookupRequest) (*pb.RelayResponse, error) {
mu.Lock()
defer mu.Unlock()
if in.Name == "" {
return nil, fmt.Errorf("name cannot be empty")
}
entry, ok := table[name(in.Name)]
if !ok {
return nil, fmt.Errorf("name not found")
}
return &pb.RelayResponse{Name: in.Name, Ip: entry.ip0}, nil
}
func (s *Server) CloseName(ctx context.Context, in *pb.LookupRequest) (*pb.CloseResponse, error) {
mu.Lock()
defer mu.Unlock()
if in.Name == "" {
return nil, fmt.Errorf("name cannot be empty")
}
_, ok := table[name(in.Name)]
if !ok {
return &pb.CloseResponse{Status: false}, fmt.Errorf("name not found")
}
delete(table, name(in.Name))
return &pb.CloseResponse{Status: true}, nil
}
|
