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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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bf6c24d0f4
* [vmalert] config parser * make linter be happy * fix test * fix sprintf add test for rule validation
133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
package common
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import (
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"bytes"
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"fmt"
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"io"
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"strings"
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"text/template"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/datasource"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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// Alert the triggered alert
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type Alert struct {
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Group string
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Name string
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Labels []datasource.Label
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Annotations map[string]string
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Start time.Time
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End time.Time
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Value float64
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}
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type alertTplData struct {
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Labels map[string]string
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ExternalLabels map[string]string
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Value float64
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}
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const tplHeader = `{{ $value := .Value }}{{ $labels := .Labels }}{{ $externalLabels := .ExternalLabels }}`
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// AlertsFromMetrics converts metrics to alerts by alert Rule
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func AlertsFromMetrics(metrics []datasource.Metric, group string, rule Rule, start, end time.Time) []Alert {
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alerts := make([]Alert, 0, len(metrics))
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var err error
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for i, m := range metrics {
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a := Alert{
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Group: group,
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Name: rule.Name,
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Start: start,
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End: end,
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Value: m.Value,
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}
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tplData := alertTplData{Value: m.Value, ExternalLabels: make(map[string]string)}
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tplData.Labels, a.Labels = mergeLabels(metrics[i].Labels, rule.Labels)
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a.Annotations, err = templateAnnotations(rule.Annotations, tplHeader, tplData)
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if err != nil {
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logger.Errorf("%s", err)
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}
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alerts = append(alerts, a)
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}
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return alerts
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}
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func mergeLabels(ml []datasource.Label, rl map[string]string) (map[string]string, []datasource.Label) {
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set := make(map[string]string, len(ml)+len(rl))
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sl := append([]datasource.Label(nil), ml...)
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for _, i := range ml {
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set[i.Name] = i.Value
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}
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for name, value := range rl {
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if _, ok := set[name]; ok {
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continue
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}
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set[name] = value
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sl = append(sl, datasource.Label{
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Name: name,
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Value: value,
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})
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}
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return set, sl
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}
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func templateAnnotations(annotations map[string]string, header string, data alertTplData) (map[string]string, error) {
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var builder strings.Builder
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var buf bytes.Buffer
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eg := errGroup{}
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r := make(map[string]string, len(annotations))
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for key, text := range annotations {
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r[key] = text
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buf.Reset()
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builder.Reset()
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builder.Grow(len(header) + len(text))
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builder.WriteString(header)
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builder.WriteString(text)
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if err := templateAnnotation(&buf, builder.String(), data); err != nil {
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eg.errs = append(eg.errs, fmt.Sprintf("key %s, template %s:%s", key, text, err))
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continue
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}
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r[key] = buf.String()
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}
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return r, eg.err()
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}
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// ValidateAnnotations validate annotations for possible template error, uses empty data for template population
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func ValidateAnnotations(annotations map[string]string) error {
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_, err := templateAnnotations(annotations, tplHeader, alertTplData{
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Labels: map[string]string{},
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ExternalLabels: map[string]string{},
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Value: 0,
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})
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return err
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}
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func templateAnnotation(dst io.Writer, text string, data alertTplData) error {
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// todo add template helper func from Prometheus
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tpl, err := template.New("").Option("missingkey=zero").Parse(text)
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if err != nil {
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return fmt.Errorf("error parsing annotation:%w", err)
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}
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if err = tpl.Execute(dst, data); err != nil {
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return fmt.Errorf("error evaluating annotation template:%w", err)
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}
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return nil
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}
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type errGroup struct {
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errs []string
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}
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func (eg *errGroup) err() error {
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if eg == nil || len(eg.errs) == 0 {
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return nil
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}
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return eg
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}
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func (eg *errGroup) Error() string {
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return fmt.Sprintf("errors:%s", strings.Join(eg.errs, "\n"))
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}
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