129 lines
2.7 KiB
Go
129 lines
2.7 KiB
Go
package client
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import (
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"fmt"
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"log"
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"net"
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"smpptester/pdu"
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"time"
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)
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const RETRY_TIMEOUT = 1 * time.Second
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type SMPPClient struct {
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Id int
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Connected bool
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enabled bool
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running bool
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conn net.Conn
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port string
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log log.Logger
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dcErr chan (error)
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}
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func NewSMPPClient(port string, id int) *SMPPClient {
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client := &SMPPClient{
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Id: id,
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port: port,
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log: log.Logger{},
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dcErr: make(chan error, 128),
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}
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client.log = *log.New(log.Writer(), "", log.LstdFlags)
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client.log.SetPrefix(fmt.Sprintf("SMPP client %d: ", client.Id))
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return client
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}
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func (c *SMPPClient) Enable() {
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if c.enabled {
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c.log.Printf("SMPP client %d is already enabled", c.Id)
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return
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}
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c.enabled = true
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c.start()
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c.log.Printf("SMPP client %d enabled", c.Id)
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}
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func (c *SMPPClient) Disable() {
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if !c.enabled {
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c.log.Printf("SMPP client %d is already disabled", c.Id)
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return
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}
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c.enabled = false
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c.dcErr <- fmt.Errorf("client is disabled")
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if c.conn != nil {
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c.conn.Close()
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}
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c.log.Printf("SMPP client %d disabled", c.Id)
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}
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func (c *SMPPClient) start() {
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if c.running {
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c.log.Printf("SMPP client %d is already running", c.Id)
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return
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}
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go func() {
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c.running = true
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defer func() {
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c.running = false
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}()
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c.log.Printf("SMPP client %d started", c.Id)
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for {
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if c.enabled && !c.Connected {
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c.log.Printf("Trying to connect to %s", c.port)
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err := c.connect()
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if err != nil {
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c.dcErr <- err
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}
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}
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err := <-c.dcErr
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c.Connected = false
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if c.enabled {
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c.log.Printf("Disconnected: '%v' trying again in %d second(s)", err, int(RETRY_TIMEOUT.Seconds()))
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time.Sleep(RETRY_TIMEOUT)
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} else {
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c.log.Printf("Disconnected: '%v' & client is disabled, quitting", err)
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break
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}
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}
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}()
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}
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func (c *SMPPClient) connect() error {
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if !c.enabled {
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return fmt.Errorf("client is not enabled")
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}
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if c.Connected {
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return fmt.Errorf("client is already connected")
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}
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conn, err := net.Dial("tcp", c.port)
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if err != nil {
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return fmt.Errorf("failed to connect to SMPP server: %w", err)
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}
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c.log.Printf("SMPP client %d connected to %s", c.Id, c.port)
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c.Connected = true
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c.conn = conn
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return nil
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}
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func (c *SMPPClient) Send(pdata pdu.PDU) error {
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if c.conn == nil {
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return fmt.Errorf("connection is not established")
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}
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pdata.UpdateSize()
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buf := pdu.ByteBufferPool.Get(pdata.Size())
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err := pdata.Encode(buf)
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if err != nil {
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return fmt.Errorf("failed to encode PDU: %w", err)
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}
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_, err = c.conn.Write(buf.Bytes())
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if err != nil {
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c.dcErr <- err
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return fmt.Errorf("failed to send PDU: %w", err)
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}
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c.log.Printf("SMPP client %d sent PDU: %+v", c.Id, pdata)
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return nil
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}
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