// Create a new EvalNode which applies a transformation func to each point in a stream and returns a single point.
func newEvalNode(et *ExecutingTask, n *pipeline.EvalNode, l *log.Logger) (*EvalNode, error) {
if len(n.AsList) != len(n.Lambdas) {
return nil, errors.New("must provide one name per expression via the 'As' property")
}
en := &EvalNode{
node: node{Node: n, et: et, logger: l},
e: n,
expressionsByGroup: make(map[models.GroupID][]stateful.Expression),
}
// Create stateful expressions
en.expressions = make([]stateful.Expression, len(n.Lambdas))
en.refVarList = make([][]string, len(n.Lambdas))
expressions := make([]ast.Node, len(n.Lambdas))
for i, lambda := range n.Lambdas {
expressions[i] = lambda.Expression
statefulExpr, err := stateful.NewExpression(lambda.Expression)
if err != nil {
return nil, fmt.Errorf("Failed to compile %v expression: %v", i, err)
}
en.expressions[i] = statefulExpr
refVars := stateful.FindReferenceVariables(lambda.Expression)
en.refVarList[i] = refVars
}
// Create a single pool for the combination of all expressions
en.scopePool = stateful.NewScopePool(stateful.FindReferenceVariables(expressions...))
// Create map of tags
if l := len(n.TagsList); l > 0 {
en.tags = make(map[string]bool, l)
for _, tag := range n.TagsList {
en.tags[tag] = true
}
}
en.node.runF = en.runEval
return en, nil
}
// Create a new CombineNode, which combines a stream with itself dynamically.
func newCombineNode(et *ExecutingTask, n *pipeline.CombineNode, l *log.Logger) (*CombineNode, error) {
cn := &CombineNode{
c: n,
node: node{Node: n, et: et, logger: l},
expressionsByGroup: make(map[models.GroupID][]stateful.Expression),
combination: combination{max: n.Max},
}
// Create stateful expressions
cn.expressions = make([]stateful.Expression, len(n.Lambdas))
cn.scopePools = make([]stateful.ScopePool, len(n.Lambdas))
for i, lambda := range n.Lambdas {
statefulExpr, err := stateful.NewExpression(lambda.Expression)
if err != nil {
return nil, fmt.Errorf("Failed to compile %v expression: %v", i, err)
}
cn.expressions[i] = statefulExpr
cn.scopePools[i] = stateful.NewScopePool(stateful.FindReferenceVariables(lambda.Expression))
}
cn.node.runF = cn.runCombine
return cn, nil
}
// Create a new FromNode which filters data from a source.
func newFromNode(et *ExecutingTask, n *pipeline.FromNode, l *log.Logger) (*FromNode, error) {
sn := &FromNode{
node: node{Node: n, et: et, logger: l},
s: n,
db: n.Database,
rp: n.RetentionPolicy,
name: n.Measurement,
}
sn.node.runF = sn.runStream
sn.allDimensions, sn.dimensions = determineDimensions(n.Dimensions)
if n.Lambda != nil {
expr, err := stateful.NewExpression(n.Lambda.Expression)
if err != nil {
return nil, fmt.Errorf("Failed to compile from expression: %v", err)
}
sn.expression = expr
sn.scopePool = stateful.NewScopePool(stateful.FindReferenceVariables(n.Lambda.Expression))
}
return sn, nil
}
func TestExpression_RefernceVariables(t *testing.T) {
type expectation struct {
node ast.Node
refVariables []string
}
expectations := []expectation{
{node: &ast.NumberNode{IsFloat: true}, refVariables: make([]string, 0)},
{node: &ast.BoolNode{}, refVariables: make([]string, 0)},
{node: &ast.ReferenceNode{Reference: "yosi"}, refVariables: []string{"yosi"}},
{node: &ast.BinaryNode{Left: &ast.ReferenceNode{Reference: "value"}, Right: &ast.NumberNode{IsInt: true}}, refVariables: []string{"value"}},
}
for i, expect := range expectations {
refVariables := stateful.FindReferenceVariables(expect.node)
if !reflect.DeepEqual(refVariables, expect.refVariables) {
t.Errorf("[Iteration: %v, Node: %T] Got unexpected result:\ngot: %v\nexpected: %v", i+1, expect.node, refVariables, expect.refVariables)
}
}
}
// Create a new K8sAutoscaleNode which can trigger autoscale event for a Kubernetes cluster.
func newK8sAutoscaleNode(et *ExecutingTask, n *pipeline.K8sAutoscaleNode, l *log.Logger) (*K8sAutoscaleNode, error) {
client, err := et.tm.K8sService.Client()
if err != nil {
return nil, fmt.Errorf("cannot use the k8sAutoscale node, could not create kubernetes client: %v", err)
}
kn := &K8sAutoscaleNode{
node: node{Node: n, et: et, logger: l},
k: n,
resourceStates: make(map[string]resourceState),
min: int(n.Min),
max: int(n.Max),
client: client,
}
if kn.min < 1 {
return nil, fmt.Errorf("minimum count must be >= 1, got %d", kn.min)
}
kn.node.runF = kn.runAutoscale
// Initialize the replicas lambda expression scope pool
if n.Replicas != nil {
kn.replicasExprs = make(map[models.GroupID]stateful.Expression)
kn.replicasScopePool = stateful.NewScopePool(stateful.FindReferenceVariables(n.Replicas.Expression))
}
return kn, nil
}
func (w *WhereNode) runWhere(snapshot []byte) error {
switch w.Wants() {
case pipeline.StreamEdge:
for p, ok := w.ins[0].NextPoint(); ok; p, ok = w.ins[0].NextPoint() {
w.timer.Start()
expr := w.expressions[p.Group]
scopePool := w.scopePools[p.Group]
if expr == nil {
compiledExpr, err := stateful.NewExpression(w.w.Lambda.Expression)
if err != nil {
return fmt.Errorf("Failed to compile expression in where clause: %v", err)
}
expr = compiledExpr
w.expressions[p.Group] = expr
scopePool = stateful.NewScopePool(stateful.FindReferenceVariables(w.w.Lambda.Expression))
w.scopePools[p.Group] = scopePool
}
if pass, err := EvalPredicate(expr, scopePool, p.Time, p.Fields, p.Tags); pass {
w.timer.Pause()
for _, child := range w.outs {
err := child.CollectPoint(p)
if err != nil {
return err
}
}
w.timer.Resume()
} else if err != nil {
w.logger.Println("E! error while evaluating expression:", err)
}
w.timer.Stop()
}
case pipeline.BatchEdge:
for b, ok := w.ins[0].NextBatch(); ok; b, ok = w.ins[0].NextBatch() {
w.timer.Start()
expr := w.expressions[b.Group]
scopePool := w.scopePools[b.Group]
if expr == nil {
compiledExpr, err := stateful.NewExpression(w.w.Lambda.Expression)
if err != nil {
return fmt.Errorf("Failed to compile expression in where clause: %v", err)
}
expr = compiledExpr
w.expressions[b.Group] = expr
scopePool = stateful.NewScopePool(stateful.FindReferenceVariables(w.w.Lambda.Expression))
w.scopePools[b.Group] = scopePool
}
points := b.Points
b.Points = make([]models.BatchPoint, 0, len(b.Points))
for _, p := range points {
if pass, err := EvalPredicate(expr, scopePool, p.Time, p.Fields, p.Tags); pass {
if err != nil {
w.logger.Println("E! error while evaluating WHERE expression:", err)
}
b.Points = append(b.Points, p)
}
}
w.timer.Stop()
for _, child := range w.outs {
err := child.CollectBatch(b)
if err != nil {
return err
}
}
}
}
return nil
}
// 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 {
tmpBuffer := an.bufPool.Get().(*bytes.Buffer)
defer func() {
tmpBuffer.Reset()
an.bufPool.Put(tmpBuffer)
}()
json.NewEncoder(tmpBuffer).Encode(v)
return html.JS(tmpBuffer.String())
},
}).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 _, telegram := range n.TelegramHandlers {
telegram := telegram
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleTelegram(telegram, ad) })
}
if len(n.TelegramHandlers) == 0 && (et.tm.TelegramService != nil && et.tm.TelegramService.Global()) {
an.handlers = append(an.handlers, func(ad *AlertData) { an.handleTelegram(&pipeline.TelegramHandler{}, ad) })
}
// If telegram has been configured with state changes only set it.
if et.tm.TelegramService != nil &&
et.tm.TelegramService.Global() &&
et.tm.TelegramService.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
}
evtmpl, err := text.New("event").Parse(alerta.Event)
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,
eventTmpl: evtmpl,
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([]stateful.Expression, CritAlert+1)
an.scopePools = make([]stateful.ScopePool, CritAlert+1)
if n.Info != nil {
statefulExpression, expressionCompileError := stateful.NewExpression(n.Info.Expression)
if expressionCompileError != nil {
return nil, fmt.Errorf("Failed to compile stateful expression for info: %s", expressionCompileError)
}
an.levels[InfoAlert] = statefulExpression
an.scopePools[InfoAlert] = stateful.NewScopePool(stateful.FindReferenceVariables(n.Info.Expression))
}
if n.Warn != nil {
statefulExpression, expressionCompileError := stateful.NewExpression(n.Warn.Expression)
if expressionCompileError != nil {
return nil, fmt.Errorf("Failed to compile stateful expression for warn: %s", expressionCompileError)
}
an.levels[WarnAlert] = statefulExpression
an.scopePools[WarnAlert] = stateful.NewScopePool(stateful.FindReferenceVariables(n.Warn.Expression))
}
if n.Crit != nil {
statefulExpression, expressionCompileError := stateful.NewExpression(n.Crit.Expression)
if expressionCompileError != nil {
return nil, fmt.Errorf("Failed to compile stateful expression for crit: %s", expressionCompileError)
}
an.levels[CritAlert] = statefulExpression
an.scopePools[CritAlert] = stateful.NewScopePool(stateful.FindReferenceVariables(n.Crit.Expression))
}
// 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
}