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client.go
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client.go
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// Copyright © 2018 Raul Sampedro
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import (
"github.com/kkontosis/SaSSHimi/utils"
"net"
"sync"
)
type Client struct {
Id string
conn net.Conn
outChann chan *DataMessage
inChann chan *DataMessage
readyToClose bool
isDead bool
clientMutex *sync.Mutex
}
func (c *Client) IsDead() bool {
return c.isDead
}
func (c *Client) ReadyToClose() bool {
return c.readyToClose
}
func (c *Client) SetReadyToClose(readyToClose bool) {
c.readyToClose = readyToClose
}
func NewClient(id string, conn net.Conn, outChannel chan *DataMessage) *Client {
return &Client{
Id: id,
conn: conn,
outChann: outChannel,
readyToClose: false,
clientMutex: &sync.Mutex{},
}
}
func (c *Client) Terminate() {
c.isDead = true
c.conn.Close()
}
func (c *Client) Close() {
var mustBeClosed bool
c.clientMutex.Lock()
if c.ReadyToClose() {
mustBeClosed = true
} else {
mustBeClosed = false
c.readyToClose = true
utils.Logger.Debug("First attempt to close", c.Id)
}
c.clientMutex.Unlock()
if mustBeClosed {
utils.Logger.Debug("Really closing", c.Id)
c.conn.Close()
}
}
func (c *Client) Write(data []byte) error {
var writed = 0
for writed < len(data) {
wn, err := c.conn.Write(data)
writed += wn
if writed < len(data) {
utils.Logger.Debugf("******* Need second write of %d bytes on client %s", len(data)-writed, c.Id)
}
if err != nil {
return err
}
}
return nil
}
func (c *Client) NotifyEOF(isDead bool) {
msg := NewMessage(c.Id, []byte{})
if !isDead {
msg.CloseClient = true
} else {
msg.DeadClient = isDead
}
c.outChann <- msg
}
func (c *Client) ReadFromClientToChannel() {
for {
data := make([]byte, 1024)
readed, err := c.conn.Read(data)
if err != nil {
c.Close()
c.NotifyEOF(false)
break
}
c.outChann <- NewMessage(c.Id, data[:readed])
}
}