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selector.go
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selector.go
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package nio
import (
"fmt"
"net"
)
var (
// ErrRegistered is returned by Poller Start() method to indicate that
// connection with the same underlying file descriptor was already
// registered within the poller instance.
ErrRegistered = fmt.Errorf("file descriptor is already registered in poller instance")
// ErrNotRegistered is returned by Poller Stop() and Resume() methods to
// indicate that connection with the same underlying file descriptor was
// not registered before within the poller instance.
ErrNotRegistered = fmt.Errorf("file descriptor was not registered before in poller instance")
// ErrNotSupport not support
ErrNotSupport = fmt.Errorf("not support")
)
const (
//OP_ACCEPT = 0x01
//OP_CONNECT = 0x02 // not support
OP_READ = 0x04
OP_WRITE = 0x08
op_IN = OP_READ
op_OUT = OP_WRITE
)
type SelectCB func(sk *SelectionKey)
type SelectOptions struct {
Timeout int // 毫秒,-1表示永久
Callback SelectCB // 设置回调,将会直接调用回调函数,而不会返回[]*SelectionKey数组
}
func New() (*Selector, error) {
poll := newPoller()
if poll == nil {
return nil, fmt.Errorf("create poller fail")
}
if err := poll.Open(); err != nil {
return nil, err
}
s := &Selector{keys: make(map[uintptr]*SelectionKey), poll: poll}
return s, nil
}
// https://www.cnblogs.com/pingh/p/3224990.html
type Selector struct {
poll poller
keys map[uintptr]*SelectionKey
readyKeys []*SelectionKey
}
func (s *Selector) Select(ops ...SelectOptions) ([]*SelectionKey, error) {
s.readyKeys = s.readyKeys[:0]
var err error
if len(ops) == 0 {
err = s.poll.Wait(s, nil, -1)
} else {
err = s.poll.Wait(s, ops[0].Callback, ops[0].Timeout)
}
if err != nil {
return nil, err
}
return s.readyKeys, nil
}
func (s *Selector) Wakeup() error {
return s.poll.Wakeup()
}
func (s *Selector) Add(channel interface{}, ops int, data interface{}) (*SelectionKey, error) {
fd, err := GetFd(channel)
if err != nil {
return nil, err
}
if s.keys[fd] != nil {
return nil, ErrRegistered
}
if err := SetNonblock(fd, true); err != nil {
return nil, err
}
if err := s.poll.Add(fd, ops); err != nil {
return nil, err
}
sk := &SelectionKey{channel: channel, data: data, fd: fd, interests: ops}
s.keys[fd] = sk
return sk, nil
}
func (s *Selector) Delete(channel interface{}) error {
sk, err := s.getSelectionKey(channel)
if err != nil {
return err
}
delete(s.keys, sk.fd)
return s.poll.Delete(sk.fd, sk.interests)
}
func (s *Selector) Modify(channel interface{}, ops int) error {
sk, err := s.getSelectionKey(channel)
if err != nil {
return err
}
if ops == sk.interests {
return nil
}
old := sk.interests
sk.interests = ops
return s.poll.Modify(sk.fd, old, ops)
}
// ModifyXOR 切换某个状态开关,通常用于OP_WRITE状态控制
func (s *Selector) ModifyXOR(channel interface{}, ops int) error {
if ops == 0 {
return nil
}
sk, err := s.getSelectionKey(channel)
if err != nil {
return err
}
old := sk.interests
sk.interests ^= ops
return s.poll.Modify(sk.fd, old, sk.interests)
}
// ModifyIf 添加或删除某个状态
func (s *Selector) ModifyIf(channel interface{}, ops int, add bool) error {
if ops == 0 {
return nil
}
sk, err := s.getSelectionKey(channel)
if err != nil {
return err
}
old := sk.interests
if add {
sk.interests |= ops
} else {
sk.interests &^= ops
}
return s.poll.Modify(sk.fd, old, sk.interests)
}
func (s *Selector) getSelectionKey(channel interface{}) (*SelectionKey, error) {
fd, err := GetFd(channel)
if err != nil {
return nil, err
}
sk := s.keys[fd]
if sk == nil {
return nil, ErrNotRegistered
}
return sk, nil
}
// TODO:自己实现net.Listener
func (s *Selector) Listen(network, address string, options ...interface{}) (net.Listener, error) {
return net.Listen(network, address)
//l, err := net.Listen(network, address)
//if err != nil {
// return l, err
//}
//
//var data interface{}
//if len(options) > 0 {
// data = options[0]
//}
//
//_, err1 := s.Add(l, OP_ACCEPT, data)
//if err1 != nil {
// return nil, err1
//}
//
//return l, err
}
func (s *Selector) Dial(network, address string, options ...interface{}) (net.Conn, error) {
return net.Dial(network, address)
}