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via.go
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via.go
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package kramer
import (
"bufio"
"context"
"encoding/xml"
"errors"
"fmt"
"net"
"regexp"
//"strconv"
"time"
)
const (
viaReboot = "Reboot"
viaReset = "Reset"
)
// VIA Struct that defines general parameters needed for any VIA
type Via struct {
Address string
Username string
Password string
Logger Logger
}
// These functions fulfill the DSP driver requirements
// GetVolumes: opening a connection with the VIAs and then return the volume for the device
func (v *Via) Volumes(ctx context.Context, block []string) (map[string]int, error) {
toReturn := make(map[string]int)
resp, err := v.GetVolume(ctx)
if err != nil {
v.Debugf("Error retrieving volume: s%", err)
return toReturn, err
}
toReturn[""] = resp
return toReturn, nil
}
// SetVolume: Connect and set the volume on the VIA
func (v *Via) SetVolume(ctx context.Context, block string, volume int) error {
_, err := v.SetViaVolume(ctx, volume)
if err != nil {
return errors.New(fmt.Sprintf("Failed to set volume for %v: %v", v.Address, err.Error()))
}
return nil
}
// GetInfo: needed by the DSP drivers implementation. Will get hardware information
func (v *Via) GetInfo(ctx context.Context) (interface{}, error) {
info, err := v.GetHardwareInfo(ctx)
if err != nil {
return info, fmt.Errorf("Failed to get hardware information: %s", err)
}
return info, nil
}
// End of DSP Driver requirements
func getConnection(address string) (*net.TCPConn, error) {
radder, err := net.ResolveTCPAddr("tcp", address+":9982")
if err != nil {
err = fmt.Errorf("error resolving address : %s", err.Error())
return nil, err
}
conn, err := net.DialTCP("tcp", nil, radder)
if err != nil {
err = fmt.Errorf("error dialing address : %s", err.Error())
return nil, err
}
return conn, nil
}
// SendCommand opens a connection with <addr> and sends the <command> to the via, returning the response from the via, or an error if one occured.
func (v *Via) sendCommand(ctx context.Context, cmd command) (string, error) {
// get the connection
v.Infof("Opening telnet connection with %s", v.Address)
conn, err := getConnection(v.Address)
if err != nil {
return "", err
}
timeoutDuration := 7 * time.Second
// Set Read Connection Duration
conn.SetReadDeadline(time.Now().Add(timeoutDuration))
// login
err = v.login(ctx, conn)
if err != nil {
v.Debugf("Houston, we have a problem logging in. The login failed: %s", err)
return "", err
}
// write command
if len(cmd.Command) > 0 {
cmd.Username = v.Username
b, err := xml.Marshal(cmd)
if err != nil {
return "", err
}
_, err = conn.Write(b)
if err != nil {
return "", err
}
}
reader := bufio.NewReader(conn)
resp, err := reader.ReadBytes('\n')
if err != nil {
err = fmt.Errorf("error reading from system: %s", err.Error())
v.Errorf(err.Error())
return "", err
}
if len(string(resp)) > 0 {
v.Infof("Response from device: %s", resp)
}
return string(resp), nil
}
func (v *Via) login(ctx context.Context, conn *net.TCPConn) error {
var cmd command
cmd.Username = v.Username
cmd.Password = v.Password
cmd.Command = "Login"
// read welcome message (Only Important when we first open a connection and login)
reader := bufio.NewReader(conn)
_, err := reader.ReadBytes('\n')
if err != nil {
err = fmt.Errorf("error reading from system: %s", err.Error())
v.Errorf(err.Error())
return err
}
v.Debugf("Logging in...")
v.Debugf("Username: %s", v.Username)
b, err := xml.Marshal(cmd)
if err != nil {
return err
}
_, err = conn.Write(b)
if err != nil {
return err
}
resp, err := reader.ReadBytes('\n')
if err != nil {
err = fmt.Errorf("error reading from system: %s", err.Error())
v.Errorf(err.Error())
return err
}
s := string(resp)
errRx := regexp.MustCompile(`Error`)
SuccessRx := regexp.MustCompile(`Successful`)
respRx := errRx.MatchString(s)
SuccessResp := SuccessRx.MatchString(s)
if respRx == true {
v.Debugf("Response from device: %s", s)
err := fmt.Errorf("Unable to login due to an error: %s", s)
return err
}
if SuccessResp == true {
v.Debugf("Connection is successful, We are connected: %s", s)
}
return nil
}