138 lines
2.2 KiB
Go
138 lines
2.2 KiB
Go
package sonic
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"net"
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"strings"
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)
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var (
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ErrClosed = errors.New("sonic connection is closed")
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ErrChanName = errors.New("invalid channel name")
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)
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// Base contains commons commands to all channels.
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type Base interface {
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// Quit stop connection, you can't execute anything after calling this method.
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// Syntax command QUIT
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Quit() error
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// Ping ping the sonic server.
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// Return an error is there is something wrong.
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// If an error occur, the sonic server is maybe down.
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// Syntax command PING
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Ping() error
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}
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type Driver struct {
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Host string
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Port int
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Password string
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channel Channel
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reader *bufio.Reader
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conn net.Conn
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closed bool
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}
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// Connect open a connection via TCP with the sonic server.
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func (c *Driver) Connect() error {
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if !IsChannelValid(c.channel) {
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return ErrChanName
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}
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c.clean()
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conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", c.Host, c.Port))
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if err != nil {
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return err
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}
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c.closed = false
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c.conn = conn
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c.reader = bufio.NewReader(c.conn)
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err = c.write(fmt.Sprintf("START %s %s", c.channel, c.Password))
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if err != nil {
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return err
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}
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_, err = c.read()
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_, err = c.read()
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if err != nil {
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return err
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}
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return nil
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}
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func (c *Driver) Quit() error {
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err := c.write("QUIT")
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if err != nil {
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return err
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}
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// should get ENDED
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_, err = c.read()
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c.clean()
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return err
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}
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func (c Driver) Ping() error {
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err := c.write("PING")
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if err != nil {
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return err
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}
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// should get PONG
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_, err = c.read()
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if err != nil {
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return err
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}
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return nil
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}
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func (c *Driver) read() (string, error) {
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if c.closed {
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return "", ErrClosed
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}
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buffer := bytes.Buffer{}
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for {
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line, isPrefix, err := c.reader.ReadLine()
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buffer.Write(line)
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if err != nil {
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if err == io.EOF {
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c.clean()
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}
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return "", err
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}
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if !isPrefix {
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break
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}
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}
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str := buffer.String()
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if strings.HasPrefix(str, "ERR ") {
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return "", errors.New(str[4:])
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}
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return str, nil
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}
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func (c Driver) write(str string) error {
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if c.closed {
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return ErrClosed
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}
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_, err := c.conn.Write([]byte(str + "\r\n"))
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return err
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}
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func (c *Driver) clean() {
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if c.conn != nil {
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_ = c.conn.Close()
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c.conn = nil
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}
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c.closed = true
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c.reader = nil
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}
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