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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url string
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// running result, -1 failed, >0 succeeded
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res chan int
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//recv
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data []byte
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signal chan []byte
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}
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func (s *SHM) sendRoutine(){
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for{
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select{
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case d := <-s.signal:
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n, err := s.rw.Write(d)
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if err != nil{
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n = -1
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}
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s.res <- n
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}
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}
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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 {
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return errors.New("please init shm producer first")
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}
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if s.rw == nil{
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var err error
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s.rw, err = shm.OpenSimplex(s.url)
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if err != nil{
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return err
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}
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}
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if s.signal == nil{
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s.signal = make(chan []byte)
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go s.sendRoutine()
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}
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s.signal <-data
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select{
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case r := <-s.res:
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if r > 0{
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return nil
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}
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return errors.New("shm send error")
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case <- time.After(3 * time.Second):
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if s.typ == coactee{
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s.Close()
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}
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close(s.signal)
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s.signal = nil
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return errors.New("shm send timeout")
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}
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return errors.New("send should't here")
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}
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func (s *SHM) recvRoutine(){
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for{
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select{
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case <- s.signal:
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n, err := s.rw.Read(s.data)
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if err != nil{
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n = -1
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}
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s.res <- n
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}
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}
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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 {
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return nil, errors.New("please open shm consumer first")
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}
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if s.rw == nil{
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var err error
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s.rw, err = shm.OpenSimplex(s.url)
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if err != nil{
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return nil, err
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}
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}
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if s.signal == nil{
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s.signal = make(chan []byte)
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s.data = make([]byte, maxRecvSize)
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go s.recvRoutine()
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}
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s.signal <- []byte{}
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select{
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case d := <-s.res:
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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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return nil, nil
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case <- time.After(3 * time.Second):
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if s.typ == coactee{
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s.Close()
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}
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close(s.signal)
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s.signal = nil
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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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}
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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.url)
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}
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s.rw = nil
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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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time.Sleep(time.Second)
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rw, err := shm.CreateSimplex(url, 0644, blocks, size)
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if err == nil {
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return &SHM{
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rw: rw,
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typ: agent,
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url: url,
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res: make(chan int),
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data: nil,
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signal: nil,
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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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return &SHM{
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rw: nil,
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typ: coactee,
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url: url,
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res: make(chan int),
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data: nil,
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signal: nil,
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}, nil
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}
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