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service.go
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service.go
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package sensu
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"regexp"
"sync/atomic"
text "text/template"
"github.com/influxdata/kapacitor/alert"
"github.com/influxdata/kapacitor/keyvalue"
)
type Diagnostic interface {
WithContext(ctx ...keyvalue.T) Diagnostic
Error(msg string, err error, kvs ...keyvalue.T)
}
type Service struct {
configValue atomic.Value
diag Diagnostic
}
var validNamePattern = regexp.MustCompile(`^[\w\.-]+$`)
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
}
type testOptions struct {
Name string `json:"name"`
Source string `json:"source"`
Output string `json:"output"`
Handlers []string `json:"handlers"`
Metadata map[string]interface{} `json:"metadata"`
Level alert.Level `json:"level"`
}
func (s *Service) TestOptions() interface{} {
return &testOptions{
Name: "testName",
Source: "Kapacitor",
Output: "testOutput",
Handlers: []string{},
Metadata: map[string]interface{}{},
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.Source,
o.Output,
o.Handlers,
o.Metadata,
o.Level,
)
}
func (s *Service) Alert(name, source, output string, handlers []string, metadata map[string]interface{}, 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, source, output, handlers, metadata, 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, source, output string, handlers []string, metadata map[string]interface{}, 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
if source == "" {
source = c.Source
}
postData["source"] = source
postData["output"] = output
postData["status"] = status
if len(handlers) == 0 {
handlers = c.Handlers
}
postData["handlers"] = handlers
addr, err := net.ResolveTCPAddr("tcp", c.Addr)
if err != nil {
return nil, nil, err
}
for k, v := range metadata {
if _, ok := postData[k]; !ok {
postData[k] = v
}
}
return addr, postData, nil
}
type HandlerConfig struct {
// Sensu source for which to post messages.
// If empty uses the source from the configuration.
Source string `mapstructure:"source"`
// Sensu handler list
// If empty uses the handler list from the configuration
Handlers []string `mapstructure:"handlers"`
// Metadata is a map of key value data to include on the sensu API request.
Metadata map[string]interface{} `mapstructure:"metadata"`
}
type handler struct {
s *Service
c HandlerConfig
diag Diagnostic
sourceTmpl *text.Template
}
func (s *Service) Handler(c HandlerConfig, ctx ...keyvalue.T) (alert.Handler, error) {
srcTmpl, err := text.New("source").Parse(c.Source)
if err != nil {
return nil, err
}
return &handler{
s: s,
c: c,
diag: s.diag.WithContext(ctx...),
sourceTmpl: srcTmpl,
}, nil
}
func (h *handler) Handle(event alert.Event) {
td := event.TemplateData()
var buf bytes.Buffer
err := h.sourceTmpl.Execute(&buf, td)
if err != nil {
h.diag.Error("failed to evaluate Sensu source template", err, keyvalue.KV("source", h.c.Source))
return
}
sourceStr := buf.String()
if err := h.s.Alert(
event.State.ID,
sourceStr,
event.State.Message,
h.c.Handlers,
h.c.Metadata,
event.State.Level,
); err != nil {
h.diag.Error("failed to send event to Sensu", err)
}
}