Xray-core/common/protocol/server_spec.go

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2020-11-25 13:01:53 +02:00
package protocol
import (
"sync"
"time"
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"github.com/xtls/xray-core/common/dice"
"github.com/xtls/xray-core/common/net"
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)
type ValidationStrategy interface {
IsValid() bool
Invalidate()
}
type alwaysValidStrategy struct{}
func AlwaysValid() ValidationStrategy {
return alwaysValidStrategy{}
}
func (alwaysValidStrategy) IsValid() bool {
return true
}
func (alwaysValidStrategy) Invalidate() {}
type timeoutValidStrategy struct {
until time.Time
}
func BeforeTime(t time.Time) ValidationStrategy {
return &timeoutValidStrategy{
until: t,
}
}
func (s *timeoutValidStrategy) IsValid() bool {
return s.until.After(time.Now())
}
func (s *timeoutValidStrategy) Invalidate() {
s.until = time.Time{}
}
type ServerSpec struct {
sync.RWMutex
dest net.Destination
users []*MemoryUser
valid ValidationStrategy
}
func NewServerSpec(dest net.Destination, valid ValidationStrategy, users ...*MemoryUser) *ServerSpec {
return &ServerSpec{
dest: dest,
users: users,
valid: valid,
}
}
func NewServerSpecFromPB(spec *ServerEndpoint) (*ServerSpec, error) {
dest := net.TCPDestination(spec.Address.AsAddress(), net.Port(spec.Port))
mUsers := make([]*MemoryUser, len(spec.User))
for idx, u := range spec.User {
mUser, err := u.ToMemoryUser()
if err != nil {
return nil, err
}
mUsers[idx] = mUser
}
return NewServerSpec(dest, AlwaysValid(), mUsers...), nil
}
func (s *ServerSpec) Destination() net.Destination {
return s.dest
}
func (s *ServerSpec) HasUser(user *MemoryUser) bool {
s.RLock()
defer s.RUnlock()
for _, u := range s.users {
if u.Account.Equals(user.Account) {
return true
}
}
return false
}
func (s *ServerSpec) AddUser(user *MemoryUser) {
if s.HasUser(user) {
return
}
s.Lock()
defer s.Unlock()
s.users = append(s.users, user)
}
func (s *ServerSpec) PickUser() *MemoryUser {
s.RLock()
defer s.RUnlock()
userCount := len(s.users)
switch userCount {
case 0:
return nil
case 1:
return s.users[0]
default:
return s.users[dice.Roll(userCount)]
}
}
func (s *ServerSpec) IsValid() bool {
return s.valid.IsValid()
}
func (s *ServerSpec) Invalidate() {
s.valid.Invalidate()
}