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alert.go
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alert.go
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package kapacitor
import (
"bytes"
"encoding/json"
"errors"
"fmt"
html "html/template"
"log"
"net/http"
"os"
"os/exec"
"path/filepath"
"sync"
text "text/template"
"time"
"github.com/influxdata/influxdb/influxql"
imodels "github.com/influxdata/influxdb/models"
"github.com/influxdata/kapacitor/models"
"github.com/influxdata/kapacitor/pipeline"
"github.com/influxdata/kapacitor/tick"
)
const (
statsAlertsTriggered = "alerts_triggered"
)
// The newest state change is weighted 'weightDiff' times more than oldest state change.
const weightDiff = 1.5
// Maximum weight applied to newest state change.
const maxWeight = 1.2
type AlertHandler func(ad *AlertData)
type AlertLevel int
const (
OKAlert AlertLevel = iota
InfoAlert
WarnAlert
CritAlert
)
func (l AlertLevel) String() string {
switch l {
case OKAlert:
return "OK"
case InfoAlert:
return "INFO"
case WarnAlert:
return "WARNING"
case CritAlert:
return "CRITICAL"
default:
panic("unknown AlertLevel")
}
}
func (l AlertLevel) MarshalText() ([]byte, error) {
return []byte(l.String()), nil
}
func (l *AlertLevel) UnmarshalText(text []byte) error {
s := string(text)
switch s {
case "OK":
*l = OKAlert
case "INFO":
*l = InfoAlert
case "WARNING":
*l = WarnAlert
case "CRITICAL":
*l = CritAlert
default:
return fmt.Errorf("unknown AlertLevel %s", s)
}
return nil
}
type AlertData struct {
ID string `json:"id"`
Message string `json:"message"`
Details string `json:"details"`
Time time.Time `json:"time"`
Level AlertLevel `json:"level"`
Data influxql.Result `json:"data"`
// Info for custom templates
info detailsInfo
}
type AlertNode struct {
node
a *pipeline.AlertNode
endpoint string
handlers []AlertHandler
levels []*tick.StatefulExpr
states map[models.GroupID]*alertState
idTmpl *text.Template
messageTmpl *text.Template
detailsTmpl *html.Template
bufPool sync.Pool
}
// Create a new AlertNode which caches the most recent item and exposes it over the HTTP API.
func newAlertNode(et *ExecutingTask, n *pipeline.AlertNode, l *log.Logger) (an *AlertNode, err error) {
an = &AlertNode{
node: node{Node: n, et: et, logger: l},
a: n,
}
an.node.runF = an.runAlert
// Create buffer pool for the templates
an.bufPool = sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
// Parse templates
an.idTmpl, err = text.New("id").Parse(n.Id)
if err != nil {
return nil, err
}
an.messageTmpl, err = text.New("message").Parse(n.Message)
if err != nil {
return nil, err
}
an.detailsTmpl, err = html.New("details").Funcs(html.FuncMap{
"json": func(v interface{}) html.JS {
a, _ := json.Marshal(v)
return html.JS(a)
},
}).Parse(n.Details)
if err != nil {
return nil, err
}
// Construct alert handlers
an.handlers = make([]AlertHandler, 0)
for _, post := range n.PostHandlers {
post := post
an.handlers = append(an.handlers, func(ad *AlertData) { an.handlePost(post, ad) })
}
for _, email := range n.EmailHandlers {
email := email
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleEmail(email, ad) })
}
if len(n.EmailHandlers) == 0 && (et.tm.SMTPService != nil && et.tm.SMTPService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleEmail(&pipeline.EmailHandler{}, ad) })
}
// If email has been configured with state changes only set it.
if et.tm.SMTPService != nil &&
et.tm.SMTPService.Global() &&
et.tm.SMTPService.StateChangesOnly() {
n.IsStateChangesOnly = true
}
for _, exec := range n.ExecHandlers {
exec := exec
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleExec(exec, ad) })
}
for _, log := range n.LogHandlers {
log := log
if !filepath.IsAbs(log.FilePath) {
return nil, fmt.Errorf("alert log path must be absolute: %s is not absolute", log.FilePath)
}
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleLog(log, ad) })
}
for _, vo := range n.VictorOpsHandlers {
vo := vo
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleVictorOps(vo, ad) })
}
if len(n.VictorOpsHandlers) == 0 && (et.tm.VictorOpsService != nil && et.tm.VictorOpsService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleVictorOps(&pipeline.VictorOpsHandler{}, ad) })
}
for _, pd := range n.PagerDutyHandlers {
pd := pd
an.handlers = append(an.handlers, func(ad *AlertData) { an.handlePagerDuty(pd, ad) })
}
if len(n.PagerDutyHandlers) == 0 && (et.tm.PagerDutyService != nil && et.tm.PagerDutyService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handlePagerDuty(&pipeline.PagerDutyHandler{}, ad) })
}
for _, sensu := range n.SensuHandlers {
sensu := sensu
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleSensu(sensu, ad) })
}
for _, slack := range n.SlackHandlers {
slack := slack
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleSlack(slack, ad) })
}
if len(n.SlackHandlers) == 0 && (et.tm.SlackService != nil && et.tm.SlackService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleSlack(&pipeline.SlackHandler{}, ad) })
}
// If slack has been configured with state changes only set it.
if et.tm.SlackService != nil &&
et.tm.SlackService.Global() &&
et.tm.SlackService.StateChangesOnly() {
n.IsStateChangesOnly = true
}
for _, hipchat := range n.HipChatHandlers {
hipchat := hipchat
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleHipChat(hipchat, ad) })
}
if len(n.HipChatHandlers) == 0 && (et.tm.HipChatService != nil && et.tm.HipChatService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleHipChat(&pipeline.HipChatHandler{}, ad) })
}
// If HipChat has been configured with state changes only set it.
if et.tm.HipChatService != nil &&
et.tm.HipChatService.Global() &&
et.tm.HipChatService.StateChangesOnly() {
n.IsStateChangesOnly = true
}
for _, alerta := range n.AlertaHandlers {
// Validate alerta templates
rtmpl, err := text.New("resource").Parse(alerta.Resource)
if err != nil {
return nil, err
}
etmpl, err := text.New("environment").Parse(alerta.Environment)
if err != nil {
return nil, err
}
gtmpl, err := text.New("group").Parse(alerta.Group)
if err != nil {
return nil, err
}
vtmpl, err := text.New("value").Parse(alerta.Value)
if err != nil {
return nil, err
}
ai := alertaHandler{
AlertaHandler: alerta,
resourceTmpl: rtmpl,
environmentTmpl: etmpl,
groupTmpl: gtmpl,
valueTmpl: vtmpl,
}
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleAlerta(ai, ad) })
}
for _, og := range n.OpsGenieHandlers {
og := og
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleOpsGenie(og, ad) })
}
if len(n.OpsGenieHandlers) == 0 && (et.tm.OpsGenieService != nil && et.tm.OpsGenieService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleOpsGenie(&pipeline.OpsGenieHandler{}, ad) })
}
for _, talk := range n.TalkHandlers {
talk := talk
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleTalk(talk, ad) })
}
// Parse level expressions
an.levels = make([]*tick.StatefulExpr, CritAlert+1)
if n.Info != nil {
an.levels[InfoAlert] = tick.NewStatefulExpr(n.Info)
}
if n.Warn != nil {
an.levels[WarnAlert] = tick.NewStatefulExpr(n.Warn)
}
if n.Crit != nil {
an.levels[CritAlert] = tick.NewStatefulExpr(n.Crit)
}
// Setup states
if n.History < 2 {
n.History = 2
}
an.states = make(map[models.GroupID]*alertState)
// Configure flapping
if n.UseFlapping {
if n.FlapLow > 1 || n.FlapHigh > 1 {
return nil, errors.New("alert flap thresholds are percentages and should be between 0 and 1")
}
}
return
}
func (a *AlertNode) runAlert([]byte) error {
a.statMap.Add(statsAlertsTriggered, 0)
switch a.Wants() {
case pipeline.StreamEdge:
for p, ok := a.ins[0].NextPoint(); ok; p, ok = a.ins[0].NextPoint() {
a.timer.Start()
l := a.determineLevel(p.Time, p.Fields, p.Tags)
state := a.updateState(l, p.Group)
if (a.a.UseFlapping && state.flapping) || (a.a.IsStateChangesOnly && !state.changed) {
a.timer.Stop()
continue
}
// send alert if we are not OK or we are OK and state changed (i.e recovery)
if l != OKAlert || state.changed {
batch := models.Batch{
Name: p.Name,
Group: p.Group,
Tags: p.Tags,
Points: []models.BatchPoint{models.BatchPointFromPoint(p)},
}
ad, err := a.alertData(p.Name, p.Group, p.Tags, p.Fields, l, p.Time, batch)
if err != nil {
return err
}
a.handleAlert(ad)
}
a.timer.Stop()
}
case pipeline.BatchEdge:
for b, ok := a.ins[0].NextBatch(); ok; b, ok = a.ins[0].NextBatch() {
a.timer.Start()
triggered := false
for _, p := range b.Points {
l := a.determineLevel(p.Time, p.Fields, p.Tags)
if l > OKAlert {
triggered = true
state := a.updateState(l, b.Group)
if (a.a.UseFlapping && state.flapping) || (a.a.IsStateChangesOnly && !state.changed) {
break
}
ad, err := a.alertData(b.Name, b.Group, b.Tags, p.Fields, l, p.Time, b)
if err != nil {
return err
}
a.handleAlert(ad)
break
}
}
if !triggered {
state := a.updateState(OKAlert, b.Group)
if state.changed {
var fields models.Fields
if l := len(b.Points); l > 0 {
fields = b.Points[l-1].Fields
}
ad, err := a.alertData(b.Name, b.Group, b.Tags, fields, OKAlert, b.TMax, b)
if err != nil {
return err
}
a.handleAlert(ad)
}
}
a.timer.Stop()
}
}
return nil
}
func (a *AlertNode) handleAlert(ad *AlertData) {
a.statMap.Add(statsAlertsTriggered, 1)
a.logger.Printf("D! %v alert triggered id:%s msg:%s data:%v", ad.Level, ad.ID, ad.Message, ad.Data.Series[0])
for _, h := range a.handlers {
h(ad)
}
}
func (a *AlertNode) determineLevel(now time.Time, fields models.Fields, tags map[string]string) (level AlertLevel) {
for l, se := range a.levels {
if se == nil {
continue
}
if pass, err := EvalPredicate(se, now, fields, tags); pass {
level = AlertLevel(l)
} else if err != nil {
a.logger.Println("E! error evaluating expression:", err)
return
} else {
return
}
}
return
}
func (a *AlertNode) batchToResult(b models.Batch) influxql.Result {
row := models.BatchToRow(b)
r := influxql.Result{
Series: imodels.Rows{row},
}
return r
}
func (a *AlertNode) alertData(
name string,
group models.GroupID,
tags models.Tags,
fields models.Fields,
level AlertLevel,
t time.Time,
b models.Batch,
) (*AlertData, error) {
id, err := a.renderID(name, group, tags)
if err != nil {
return nil, err
}
msg, details, info, err := a.renderMessageAndDetails(id, name, t, group, tags, fields, level)
if err != nil {
return nil, err
}
ad := &AlertData{
ID: id,
Message: msg,
Details: details,
Time: t,
Level: level,
Data: a.batchToResult(b),
info: info,
}
return ad, nil
}
type alertState struct {
history []AlertLevel
idx int
flapping bool
changed bool
}
func (a *alertState) addEvent(level AlertLevel) {
a.changed = a.history[a.idx] != level
a.idx = (a.idx + 1) % len(a.history)
a.history[a.idx] = level
}
func (a *alertState) percentChange() float64 {
l := len(a.history)
changes := 0.0
weight := (maxWeight / weightDiff)
step := (maxWeight - weight) / float64(l-1)
for i := 0; i < l-1; i++ {
// get current index
c := (i + a.idx) % l
// get previous index
p := c - 1
// check for wrap around
if p < 0 {
p = l - 1
}
if a.history[c] != a.history[p] {
changes += weight
}
weight += step
}
p := changes / float64(l-1)
return p
}
func (a *AlertNode) updateState(level AlertLevel, group models.GroupID) *alertState {
state, ok := a.states[group]
if !ok {
state = &alertState{
history: make([]AlertLevel, a.a.History),
}
a.states[group] = state
}
state.addEvent(level)
if a.a.UseFlapping {
p := state.percentChange()
if state.flapping && p < a.a.FlapLow {
state.flapping = false
} else if !state.flapping && p > a.a.FlapHigh {
state.flapping = true
}
}
return state
}
// Type containing information available to ID template.
type idInfo struct {
// Measurement name
Name string
// Task name
TaskName string
// Concatenation of all group-by tags of the form [key=value,]+.
// If not groupBy is performed equal to literal 'nil'
Group string
// Map of tags
Tags map[string]string
}
type messageInfo struct {
idInfo
// The ID of the alert.
ID string
// Fields of alerting data point.
Fields map[string]interface{}
// Alert Level, one of: INFO, WARNING, CRITICAL.
Level string
// Time
Time time.Time
}
type detailsInfo struct {
messageInfo
// The Message of the Alert
Message string
}
func (a *AlertNode) renderID(name string, group models.GroupID, tags models.Tags) (string, error) {
g := string(group)
if group == models.NilGroup {
g = "nil"
}
info := idInfo{
Name: name,
TaskName: a.et.Task.Name,
Group: g,
Tags: tags,
}
id := a.bufPool.Get().(*bytes.Buffer)
defer a.bufPool.Put(id)
id.Reset()
err := a.idTmpl.Execute(id, info)
if err != nil {
return "", err
}
return id.String(), nil
}
func (a *AlertNode) renderMessageAndDetails(id, name string, t time.Time, group models.GroupID, tags models.Tags, fields models.Fields, level AlertLevel) (string, string, detailsInfo, error) {
g := string(group)
if group == models.NilGroup {
g = "nil"
}
minfo := messageInfo{
idInfo: idInfo{
Name: name,
TaskName: a.et.Task.Name,
Group: g,
Tags: tags,
},
ID: id,
Fields: fields,
Level: level.String(),
Time: t,
}
// Grab a buffer for the message template and the details template
tmpBuffer := a.bufPool.Get().(*bytes.Buffer)
defer a.bufPool.Put(tmpBuffer)
tmpBuffer.Reset()
err := a.messageTmpl.Execute(tmpBuffer, minfo)
if err != nil {
return "", "", detailsInfo{}, err
}
msg := tmpBuffer.String()
dinfo := detailsInfo{
messageInfo: minfo,
Message: msg,
}
// Reuse the buffer, for the details template
tmpBuffer.Reset()
err = a.detailsTmpl.Execute(tmpBuffer, dinfo)
if err != nil {
return "", "", dinfo, err
}
details := tmpBuffer.String()
return msg, details, dinfo, nil
}
//--------------------------------
// Alert handlers
func (a *AlertNode) handlePost(post *pipeline.PostHandler, ad *AlertData) {
b, err := json.Marshal(ad)
if err != nil {
a.logger.Println("E! failed to marshal alert data json", err)
return
}
buf := bytes.NewBuffer(b)
_, err = http.Post(post.URL, "application/json", buf)
if err != nil {
a.logger.Println("E! failed to POST batch", err)
}
}
func (a *AlertNode) handleEmail(email *pipeline.EmailHandler, ad *AlertData) {
if a.et.tm.SMTPService != nil {
err := a.et.tm.SMTPService.SendMail(email.ToList, ad.Message, ad.Details)
if err != nil {
a.logger.Println("E!", err)
}
} else {
a.logger.Println("E! smtp service not enabled, cannot send email.")
}
}
func (a *AlertNode) handleExec(ex *pipeline.ExecHandler, ad *AlertData) {
b, err := json.Marshal(ad)
if err != nil {
a.logger.Println("E! failed to marshal alert data json", err)
return
}
cmd := exec.Command(ex.Command[0], ex.Command[1:]...)
cmd.Stdin = bytes.NewBuffer(b)
var out bytes.Buffer
cmd.Stdout = &out
cmd.Stderr = &out
err = cmd.Run()
if err != nil {
a.logger.Println("E! error running alert command:", err, out.String())
return
}
}
func (a *AlertNode) handleLog(l *pipeline.LogHandler, ad *AlertData) {
b, err := json.Marshal(ad)
if err != nil {
a.logger.Println("E! failed to marshal alert data json", err)
return
}
f, err := os.OpenFile(l.FilePath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, os.FileMode(l.Mode))
if err != nil {
a.logger.Println("E! failed to open file for alert logging", err)
return
}
defer f.Close()
n, err := f.Write(b)
if n != len(b) || err != nil {
a.logger.Println("E! failed to write to file", err)
}
n, err = f.Write([]byte("\n"))
if n != 1 || err != nil {
a.logger.Println("E! failed to write to file", err)
}
}
func (a *AlertNode) handleVictorOps(vo *pipeline.VictorOpsHandler, ad *AlertData) {
if a.et.tm.VictorOpsService == nil {
a.logger.Println("E! failed to send VictorOps alert. VictorOps is not enabled")
return
}
var messageType string
switch ad.Level {
case OKAlert:
messageType = "RECOVERY"
default:
messageType = ad.Level.String()
}
err := a.et.tm.VictorOpsService.Alert(
vo.RoutingKey,
messageType,
ad.Message,
ad.ID,
ad.Time,
ad.Data,
)
if err != nil {
a.logger.Println("E! failed to send alert data to VictorOps:", err)
return
}
}
func (a *AlertNode) handlePagerDuty(pd *pipeline.PagerDutyHandler, ad *AlertData) {
if a.et.tm.PagerDutyService == nil {
a.logger.Println("E! failed to send PagerDuty alert. PagerDuty is not enabled")
return
}
err := a.et.tm.PagerDutyService.Alert(
ad.ID,
ad.Message,
ad.Level,
ad.Data,
)
if err != nil {
a.logger.Println("E! failed to send alert data to PagerDuty:", err)
return
}
}
func (a *AlertNode) handleSensu(sensu *pipeline.SensuHandler, ad *AlertData) {
if a.et.tm.SensuService == nil {
a.logger.Println("E! failed to send Sensu message. Sensu is not enabled")
return
}
err := a.et.tm.SensuService.Alert(
ad.ID,
ad.Message,
ad.Level,
)
if err != nil {
a.logger.Println("E! failed to send alert data to Sensu:", err)
return
}
}
func (a *AlertNode) handleSlack(slack *pipeline.SlackHandler, ad *AlertData) {
if a.et.tm.SlackService == nil {
a.logger.Println("E! failed to send Slack message. Slack is not enabled")
return
}
err := a.et.tm.SlackService.Alert(
slack.Channel,
ad.Message,
ad.Level,
)
if err != nil {
a.logger.Println("E! failed to send alert data to Slack:", err)
return
}
}
func (a *AlertNode) handleHipChat(hipchat *pipeline.HipChatHandler, ad *AlertData) {
if a.et.tm.HipChatService == nil {
a.logger.Println("E! failed to send HipChat message. HipChat is not enabled")
return
}
err := a.et.tm.HipChatService.Alert(
hipchat.Room,
hipchat.Token,
ad.Message,
ad.Level,
)
if err != nil {
a.logger.Println("E! failed to send alert data to HipChat:", err)
return
}
}
type alertaHandler struct {
*pipeline.AlertaHandler
resourceTmpl *text.Template
environmentTmpl *text.Template
valueTmpl *text.Template
groupTmpl *text.Template
}
func (a *AlertNode) handleAlerta(alerta alertaHandler, ad *AlertData) {
if a.et.tm.AlertaService == nil {
a.logger.Println("E! failed to send Alerta message. Alerta is not enabled")
return
}
var severity string
switch ad.Level {
case OKAlert:
severity = "ok"
case InfoAlert:
severity = "informational"
case WarnAlert:
severity = "warning"
case CritAlert:
severity = "critical"
default:
severity = "indeterminate"
}
var buf bytes.Buffer
err := alerta.resourceTmpl.Execute(&buf, ad.info)
if err != nil {
a.logger.Printf("E! failed to evaluate Alerta Resource template %s", alerta.Resource)
return
}
resource := buf.String()
buf.Reset()
err = alerta.environmentTmpl.Execute(&buf, ad.info)
if err != nil {
a.logger.Printf("E! failed to evaluate Alerta Environment template %s", alerta.Environment)
return
}
environment := buf.String()
buf.Reset()
err = alerta.groupTmpl.Execute(&buf, ad.info)
if err != nil {
a.logger.Printf("E! failed to evaluate Alerta Group template %s", alerta.Group)
return
}
group := buf.String()
buf.Reset()
err = alerta.valueTmpl.Execute(&buf, ad.info)
if err != nil {
a.logger.Printf("E! failed to evaluate Alerta Value template %s", alerta.Value)
return
}
value := buf.String()
service := alerta.Service
if len(alerta.Service) == 0 {
service = []string{ad.info.Name}
}
err = a.et.tm.AlertaService.Alert(
alerta.Token,
resource,
ad.ID,
environment,
severity,
group,
value,
ad.Message,
alerta.Origin,
service,
ad.Data,
)
if err != nil {
a.logger.Println("E! failed to send alert data to Alerta:", err)
return
}
}
func (a *AlertNode) handleOpsGenie(og *pipeline.OpsGenieHandler, ad *AlertData) {
if a.et.tm.OpsGenieService == nil {
a.logger.Println("E! failed to send OpsGenie alert. OpsGenie is not enabled")
return
}
var messageType string
switch ad.Level {
case OKAlert:
messageType = "RECOVERY"
default:
messageType = ad.Level.String()
}
err := a.et.tm.OpsGenieService.Alert(
og.TeamsList,
og.RecipientsList,
messageType,
ad.Message,
ad.ID,
ad.Time,
ad.Data,
)
if err != nil {
a.logger.Println("E! failed to send alert data to OpsGenie:", err)
return
}
}
func (a *AlertNode) handleTalk(talk *pipeline.TalkHandler, ad *AlertData) {
if a.et.tm.TalkService == nil {
a.logger.Println("E! failed to send Talk message. Talk is not enabled")
return
}
err := a.et.tm.TalkService.Alert(
ad.ID,
ad.Message,
)
if err != nil {
a.logger.Println("E! failed to send alert data to Talk:", err)
return
}
}