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client.go
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client.go
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package shoutcast
import (
"bufio"
"errors"
"fmt"
"net"
"sort"
"strings"
"time"
)
type Client struct {
Host string
Password string
Headers map[string]string
Timeout time.Duration
connection net.Conn
readWriter *bufio.ReadWriter
}
func (client *Client) Connect() (connection net.Conn, err error) {
err = client.Dial()
if err != nil {
return
}
err = client.SendPassword()
if err != nil {
return
}
err = client.SendHeaders()
if err != nil {
return
}
connection = client.connection
return
}
func (client *Client) SendPassword() error {
err := client.Write(client.Password)
if err != nil {
return err
}
client.Flush()
var response string
response, err = client.Read()
if err != nil {
return err
}
if !strings.HasPrefix(response, "OK") {
return errors.New(fmt.Sprintf("Shoutcast server rejects request: %s", response))
}
return nil
}
func (client *Client) sortedHeaderNames() []string {
var keys []string
for key := range client.Headers {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
}
func (client *Client) SendHeaders() error {
for _, attribute := range client.sortedHeaderNames() {
value := client.Headers[attribute]
if err := client.SendHeader(attribute, value); err != nil {
return err
}
}
if err := client.Write(""); err != nil {
return nil
}
return client.Flush()
}
func (client *Client) SendHeader(name, value string) error {
return client.Write(fmt.Sprintf("%s:%s", name, value))
}
func (client *Client) Write(message string) error {
_, err := client.readWriter.WriteString(fmt.Sprintf("%s\n", message))
return err
}
func (client *Client) Read() (response string, err error) {
response, err = client.readWriter.ReadString('\n')
if err != nil {
return
}
response = strings.TrimSpace(response)
return
}
func (client *Client) Flush() error {
return client.readWriter.Flush()
}
func (client *Client) Dial() error {
if client.Timeout == 0 {
client.Timeout = 10 * time.Second
}
connection, err := net.DialTimeout("tcp", client.Host, client.Timeout)
if err != nil {
return err
}
client.connection = connection
client.readWriter = bufio.NewReadWriter(bufio.NewReader(connection), bufio.NewWriter(connection))
return nil
}
func (client *Client) Close() {
if client.connection != nil {
client.connection.Close()
client.connection = nil
}
client.readWriter = nil
}