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service.go
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service.go
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package sensu
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net"
"regexp"
"sync/atomic"
"github.com/influxdata/kapacitor/alert"
)
type Service struct {
configValue atomic.Value
logger *log.Logger
}
var validNamePattern = regexp.MustCompile(`^[\w\.-]+$`)
func NewService(c Config, l *log.Logger) *Service {
s := &Service{
logger: l,
}
s.configValue.Store(c)
return s
}
func (s *Service) Open() error {
return nil
}
func (s *Service) Close() error {
return nil
}
func (s *Service) config() Config {
return s.configValue.Load().(Config)
}
func (s *Service) Update(newConfig []interface{}) error {
if l := len(newConfig); l != 1 {
return fmt.Errorf("expected only one new config object, got %d", l)
}
if c, ok := newConfig[0].(Config); !ok {
return fmt.Errorf("expected config object to be of type %T, got %T", c, newConfig[0])
} else {
s.configValue.Store(c)
}
return nil
}
type testOptions struct {
Name string `json:"name"`
Output string `json:"output"`
Level alert.Level `json:"level"`
}
func (s *Service) TestOptions() interface{} {
return &testOptions{
Name: "testName",
Output: "testOutput",
Level: alert.Critical,
}
}
func (s *Service) Test(options interface{}) error {
o, ok := options.(*testOptions)
if !ok {
return fmt.Errorf("unexpected options type %T", options)
}
return s.Alert(
o.Name,
o.Output,
o.Level,
)
}
func (s *Service) Alert(name, output string, level alert.Level) error {
if !validNamePattern.MatchString(name) {
return fmt.Errorf("invalid name %q for sensu alert. Must match %v", name, validNamePattern)
}
addr, postData, err := s.prepareData(name, output, level)
if err != nil {
return err
}
conn, err := net.DialTCP("tcp", nil, addr)
if err != nil {
return err
}
defer conn.Close()
enc := json.NewEncoder(conn)
err = enc.Encode(postData)
if err != nil {
return err
}
resp, err := ioutil.ReadAll(conn)
if err != nil {
return err
}
if string(resp) != "ok" {
return errors.New("sensu socket error: " + string(resp))
}
return nil
}
func (s *Service) prepareData(name, output string, level alert.Level) (*net.TCPAddr, map[string]interface{}, error) {
c := s.config()
if !c.Enabled {
return nil, nil, errors.New("service is not enabled")
}
var status int
switch level {
case alert.OK:
status = 0
case alert.Info:
status = 0
case alert.Warning:
status = 1
case alert.Critical:
status = 2
default:
status = 3
}
postData := make(map[string]interface{})
postData["name"] = name
postData["source"] = c.Source
postData["output"] = output
postData["status"] = status
addr, err := net.ResolveTCPAddr("tcp", c.Addr)
if err != nil {
return nil, nil, err
}
return addr, postData, nil
}
type handler struct {
s *Service
logger *log.Logger
}
func (s *Service) Handler(l *log.Logger) alert.Handler {
return &handler{
s: s,
logger: l,
}
}
func (h *handler) Handle(event alert.Event) {
if err := h.s.Alert(
event.State.ID,
event.State.Message,
event.State.Level,
); err != nil {
h.logger.Println("E! failed to send event to Sensu", err)
}
}