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hamalerts.go
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hamalerts.go
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package tasks
import (
"bufio"
"fmt"
"io"
"log"
"net"
"regexp"
"strings"
"time"
"github.com/bbathe/golog/config"
"github.com/bbathe/golog/models/spot"
)
var (
quitHamAlert chan bool
har *hamAlertReader
errEmptyMsg = fmt.Errorf("empty message from HamAlert server")
badMsg = "unexpected message from HamAlert server %s"
)
// our own type so we can make this "quitable"
type hamAlertReader struct {
c net.Conn
r *bufio.Reader
}
func NewHamAlertReader() (*hamAlertReader, error) {
// connect
con, err := net.Dial("tcp", config.ClusterServices.HamAlert.HostPort)
if err != nil {
log.Printf("%+v", err)
return nil, err
}
return &hamAlertReader{c: con, r: bufio.NewReader(con)}, nil
}
func (har *hamAlertReader) readString(delim byte) (*string, error) {
msg, err := har.r.ReadString(delim)
if err != nil {
select {
case <-quitHamAlert:
return nil, nil
default:
if err == io.EOF {
var empty string
return &empty, nil
}
log.Printf("%+v", err)
return nil, err
}
}
return &msg, nil
}
func (har *hamAlertReader) readAndExpect(delim byte, expect string) error {
msg, err := har.readString(delim)
if err != nil {
log.Printf("%+v", err)
return err
}
if msg == nil {
return errEmptyMsg
}
if !strings.Contains(*msg, expect) {
err := fmt.Errorf(badMsg, *msg)
log.Printf("%+v", err)
return err
}
return nil
}
func (har *hamAlertReader) writeString(s string) error {
_, err := fmt.Fprintln(har.c, s)
if err != nil {
log.Printf("%+v", err)
return err
}
return nil
}
// gatherHamAlerts does the real work of inetgrating with HamAlert to collect spot
// only returns if we couldn't connect to HamAlert or connection is closed
func (har *hamAlertReader) gatherHamAlerts() error {
var err error
var msg *string
// login
err = har.readAndExpect('\n', "HamAlert")
if err != nil {
log.Printf("%+v", err)
return err
}
// hamalert username
err = har.readAndExpect(':', "login:")
if err != nil {
log.Printf("%+v", err)
return err
}
err = har.writeString(config.ClusterServices.HamAlert.Username)
if err != nil {
log.Printf("%+v", err)
return err
}
// hamalert password
err = har.readAndExpect(':', "password:")
if err != nil {
log.Printf("%+v", err)
return err
}
err = har.writeString(config.ClusterServices.HamAlert.Password)
if err != nil {
log.Printf("%+v", err)
return err
}
// verify greeting
msg, err = har.readString('>')
if err != nil {
log.Printf("%+v", err)
return err
}
if msg == nil {
return errEmptyMsg
}
if !strings.Contains(*msg, fmt.Sprintf("%s de HamAlert", strings.ToUpper(config.ClusterServices.HamAlert.Username))) {
err := fmt.Errorf("authentication failure %s", *msg)
log.Printf("%+v", err)
return err
}
// throw out next line, part of greeting
_, err = har.readString('\n')
if err != nil {
log.Printf("%+v", err)
return err
}
// prime with a little history
err = har.writeString("show/dx 5")
if err != nil {
log.Printf("%+v", err)
return err
}
// wait for new lines to show up and add spot entries for them
re := regexp.MustCompile(`^DX de\s+([^:]+):\s+([^\s]+)\s+([^\s]+)\s+(.*)([0-9]{4})Z`)
for {
select {
case <-quitHamAlert:
return nil
default:
msg, err = har.readString('\n')
if err != nil {
log.Printf("%+v", err)
return err
}
if msg == nil {
return nil
}
//log.Printf("%s", *msg)
// parse for elements
match := re.FindStringSubmatch(*msg)
if match == nil {
if strings.HasPrefix(strings.ToLower(*msg), "no spots") {
// pause
time.Sleep(30 * time.Second)
continue
}
err := fmt.Errorf("could not match on message '%s'", *msg)
log.Printf("%+v", err)
return err
}
//log.Printf("%+v", match)
err = spot.Add(match[5], match[3], match[2], match[4], match[1])
if err != nil {
log.Printf("%+v", err)
return err
}
}
}
}
// StartHamAlerts starts the collection of spots from HamAlert
func StartHamAlerts() {
quitHamAlert = make(chan bool)
go func() {
// this gives us reconnect and ability to stop/start
for {
select {
case <-quitHamAlert:
return
default:
setTaskStatus(TaskHamAlert, TaskStatusOK)
var err error
har, err = NewHamAlertReader()
if err != nil {
log.Printf("%+v", err)
} else {
err = har.gatherHamAlerts()
if err != nil {
log.Printf("%+v", err)
}
}
setTaskStatus(TaskHamAlert, TaskStatusFailed)
if err != nil {
// some connection problem, pause before retry
time.Sleep(30 * time.Second)
}
}
}
}()
}
// StopHamAlerts shutdowns the collection of spots from HamAlert
func StopHamAlerts() {
close(quitHamAlert)
har.c.Close()
}