package deliver
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import (
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"errors"
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"fmt"
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// "io"
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"time"
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"github.com/tmthrgd/shm-go"
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)
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// SHM share memory
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type SHM struct {
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rw *shm.ReadWriteCloser
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typ td
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data []byte
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}
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// Send impl interface Diliver
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func (s *SHM) Send(data []byte) error {
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if s == nil || s.rw == nil {
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return errors.New("please init shm producer first")
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}
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ch := make(chan int)
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go func(){
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n, _ := s.rw.Write(data)
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ch <- n
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}()
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select{
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case <-ch:
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return nil
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case <- time.After(3 * time.Second):
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return errors.New("send time out")
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}
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return errors.New("send should't here")
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// n, err := s.rw.Write(data)
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// if n < 1 {
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// fmt.Println("recv data less than 1 length")
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// }
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// return err
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}
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// Recv impl interface Diliver
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func (s *SHM) Recv() ([]byte, error) {
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if s == nil || s.rw == nil {
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return nil, errors.New("please open shm consumer first")
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}
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ch := make(chan int)
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go func(){
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n, _ := s.rw.Read(s.data)
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ch <- n
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}()
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select{
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case d := <-ch:
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if d > 0{
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data := make([]byte, d)
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copy(data, s.data)
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return data, nil
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}
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case <- time.After(3 * time.Second):
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return nil, errors.New("recv time out")
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}
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return nil, errors.New("recv should't here")
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// data := make([]byte, maxRecvSize)
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// n, err := s.rw.Read(data)
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// if err == nil || err == io.EOF {
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// data = data[:n:n]
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// return data, nil
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// }
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// return nil, err
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}
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// Close impl interface Deliver
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func (s *SHM) Close() {
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if s == nil {
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return
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}
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if s.rw != nil {
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s.rw.Close()
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}
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if s.typ == agent {
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shm.Unlink(s.rw.Name())
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}
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}
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func shmServer(m Mode, url string, args ...interface{}) (*SHM, error) {
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if m != Shm {
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return nil, errors.New("please use deliver.Shm mode")
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}
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var param []int
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for _, v := range args {
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switch v.(type) {
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case int:
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param = append(param, v.(int))
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default:
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return nil, errors.New("shmServer created recv error parameters")
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}
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}
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blocks, size := 2, maxRecvSize
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if len(param) == 2 {
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blocks, size = param[0], param[1]
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// return nil, errors.New("shmServer created recv too much parameters")
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}
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shm.Unlink(url)
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rw, err := shm.CreateSimplex(url, 0644, blocks, size)
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if err == nil {
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fmt.Println(rw.Name())
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return &SHM{
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rw,
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agent,
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make([]byte, maxRecvSize),
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}, nil
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}
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return nil, err
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}
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func shmClient(m Mode, url string, args ...interface{}) (*SHM, error) {
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if m != Shm {
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return nil, errors.New("please use deliver.Shm mode")
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}
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rw, err := shm.OpenSimplex(url)
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if err == nil {
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return &SHM{
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rw,
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coactee,
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make([]byte, maxRecvSize),
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}, nil
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}
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return nil, err
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}
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