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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"reflect"
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"time"
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"unsafe"
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"basic.com/valib/shm.git"
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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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recvData []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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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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// orig
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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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// cur
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// data, err := s.rw.DirectRead()
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// if err == nil || err == io.EOF {
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// return data, nil
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// }
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// new
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if s.recvData == nil {
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s.recvData = make([]byte, maxRecvSize)
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}
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sliceHeader := (*reflect.SliceHeader)(unsafe.Pointer(&s.recvData))
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// sliceHeader.Cap = maxRecvSize
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sliceHeader.Len = maxRecvSize
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n, err := s.rw.Read(s.recvData)
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if err == nil || err == io.EOF {
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sliceHeader.Len = n
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return s.recvData, nil
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}
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return nil, err
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}
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// Recv2 impl interface
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func (s *SHM) Recv2(data []byte) (int, error) {
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if s == nil || s.rw == nil {
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return 0, errors.New("please open shm consumer first")
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}
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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 n, nil
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}
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return 0, 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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time.Sleep(time.Millisecond)
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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: rw,
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typ: agent,
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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: rw,
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typ: coactee,
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}, nil
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}
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return nil, err
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}
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