/
messager.go
80 lines (64 loc) · 1.33 KB
/
messager.go
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package internal
import (
"github.com/iot-master-contrib/modbus/define"
"io"
"sync"
"time"
)
type Messenger struct {
Timeout time.Duration
mu sync.Mutex
tunnel define.Conn
}
func (m *Messenger) Ask(request []byte, response []byte) (int, error) {
m.mu.Lock()
defer m.mu.Unlock()
//s := bufio.NewReader(m.tunnel)
//先写
_, err := m.tunnel.Write(request)
if err != nil {
return 0, err
}
//读超时
err = m.tunnel.SetReadTimeout(m.Timeout)
if err != nil {
return 0, err
}
return m.tunnel.Read(response)
}
func (m *Messenger) AskAtLeast(request []byte, response []byte, min int) (int, error) {
m.mu.Lock()
defer m.mu.Unlock()
//先写
_, err := m.tunnel.Write(request)
if err != nil {
return 0, err
}
//读超时
err = m.tunnel.SetReadTimeout(m.Timeout)
if err != nil {
return 0, err
}
return io.ReadAtLeast(m.tunnel, response, min)
}
func (m *Messenger) Read(response []byte) (int, error) {
m.mu.Lock()
defer m.mu.Unlock()
//读超时
err := m.tunnel.SetReadTimeout(m.Timeout)
if err != nil {
return 0, err
}
//读
return m.tunnel.Read(response)
}
func (m *Messenger) ReadAtLeast(response []byte, min int) (int, error) {
m.mu.Lock()
defer m.mu.Unlock()
//读超时
err := m.tunnel.SetReadTimeout(m.Timeout)
if err != nil {
return 0, err
}
return io.ReadAtLeast(m.tunnel, response, min)
}