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service.go
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service.go
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package pagerduty
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"sync/atomic"
"github.com/influxdata/kapacitor/alert"
"github.com/influxdata/kapacitor/keyvalue"
)
type Diagnostic interface {
WithContext(ctx ...keyvalue.T) Diagnostic
Error(msg string, err error)
}
type Service struct {
configValue atomic.Value
HTTPDService interface {
URL() string
}
diag Diagnostic
}
func NewService(c Config, d Diagnostic) *Service {
s := &Service{
diag: d,
}
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
}
func (s *Service) Global() bool {
c := s.config()
return c.Global
}
type testOptions struct {
IncidentKey string `json:"incident-key"`
Description string `json:"description"`
Details string `json:"details"`
Level alert.Level `json:"level"`
}
func (s *Service) TestOptions() interface{} {
return &testOptions{
IncidentKey: "testIncidentKey",
Description: "test pagerduty message",
Level: alert.Critical,
}
}
func (s *Service) Test(options interface{}) error {
o, ok := options.(*testOptions)
if !ok {
return fmt.Errorf("unexpected options type %T", options)
}
c := s.config()
return s.Alert(
c.ServiceKey,
o.IncidentKey,
o.Description,
o.Level,
o.Details,
)
}
func (s *Service) Alert(serviceKey, incidentKey, desc string, level alert.Level, details string) error {
url, post, err := s.preparePost(serviceKey, incidentKey, desc, level, details)
if err != nil {
return err
}
resp, err := http.Post(url, "application/json", post)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
type response struct {
Message string `json:"message"`
}
r := &response{Message: fmt.Sprintf("failed to understand PagerDuty response. code: %d content: %s", resp.StatusCode, string(body))}
b := bytes.NewReader(body)
dec := json.NewDecoder(b)
dec.Decode(r)
return errors.New(r.Message)
}
return nil
}
func (s *Service) preparePost(serviceKey, incidentKey, desc string, level alert.Level, details string) (string, io.Reader, error) {
c := s.config()
if !c.Enabled {
return "", nil, errors.New("service is not enabled")
}
var eventType string
switch level {
case alert.Warning, alert.Critical:
eventType = "trigger"
case alert.Info:
return "", nil, fmt.Errorf("AlertLevel 'info' is currently ignored by the PagerDuty service")
default:
eventType = "resolve"
}
pData := make(map[string]string)
if serviceKey == "" {
pData["service_key"] = c.ServiceKey
} else {
pData["service_key"] = serviceKey
}
pData["event_type"] = eventType
pData["description"] = desc
pData["incident_key"] = incidentKey
pData["client"] = "kapacitor"
pData["client_url"] = s.HTTPDService.URL()
pData["details"] = details
// Post data to PagerDuty
var post bytes.Buffer
enc := json.NewEncoder(&post)
err := enc.Encode(pData)
if err != nil {
return "", nil, err
}
return c.URL, &post, nil
}
type HandlerConfig struct {
// The service key to use for the alert.
// Defaults to the value in the configuration if empty.
ServiceKey string `mapstructure:"service-key"`
}
type handler struct {
s *Service
c HandlerConfig
diag Diagnostic
}
func (s *Service) Handler(c HandlerConfig, ctx ...keyvalue.T) alert.Handler {
return &handler{
s: s,
c: c,
diag: s.diag.WithContext(ctx...),
}
}
func (h *handler) Handle(event alert.Event) {
if err := h.s.Alert(
h.c.ServiceKey,
event.State.ID,
event.State.Message,
event.State.Level,
event.State.Details,
); err != nil {
h.diag.Error("failed to send event to PagerDuty", err)
}
}