mirror of
https://github.com/grafana/grafana.git
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120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
package state
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import (
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"context"
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"encoding/json"
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"fmt"
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"math"
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"net/url"
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"strconv"
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"time"
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text_template "text/template"
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"github.com/grafana/grafana/pkg/services/ngalert/eval"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/pkg/timestamp"
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"github.com/prometheus/prometheus/promql"
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"github.com/prometheus/prometheus/template"
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)
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// templateCaptureValue represents each value in .Values in the annotations
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// and labels template.
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type templateCaptureValue struct {
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Labels map[string]string
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Value float64
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}
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// String implements the Stringer interface to print the value of each RefID
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// in the template via {{ $values.A }} rather than {{ $values.A.Value }}.
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func (v templateCaptureValue) String() string {
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return strconv.FormatFloat(v.Value, 'f', -1, 64)
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}
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func expandTemplate(ctx context.Context, name, text string, labels map[string]string, alertInstance eval.Result, externalURL *url.URL) (result string, resultErr error) {
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name = "__alert_" + name
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text = "{{- $labels := .Labels -}}{{- $values := .Values -}}{{- $value := .Value -}}" + text
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data := struct {
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Labels map[string]string
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Values map[string]templateCaptureValue
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Value string
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}{
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Labels: labels,
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Values: newTemplateCaptureValues(alertInstance.Values),
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Value: alertInstance.EvaluationString,
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}
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expander := template.NewTemplateExpander(
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ctx, // This context is only used with the `query()` function - which we don't support yet.
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text,
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name,
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data,
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model.Time(timestamp.FromTime(alertInstance.EvaluatedAt)),
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func(context.Context, string, time.Time) (promql.Vector, error) {
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return nil, nil
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},
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externalURL,
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[]string{"missingkey=invalid"},
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)
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expander.Funcs(text_template.FuncMap{
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"graphLink": graphLink,
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"tableLink": tableLink,
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// This function is a no-op for now.
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"strvalue": func(value templateCaptureValue) string {
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return ""
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},
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})
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return expander.Expand()
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}
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func newTemplateCaptureValues(values map[string]eval.NumberValueCapture) map[string]templateCaptureValue {
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m := make(map[string]templateCaptureValue)
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for k, v := range values {
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var f float64
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if v.Value != nil {
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f = *v.Value
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} else {
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f = math.NaN()
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}
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m[k] = templateCaptureValue{
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Labels: v.Labels,
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Value: f,
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}
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}
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return m
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}
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type query struct {
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Datasource string `json:"datasource"`
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Expr string `json:"expr"`
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}
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func graphLink(rawQuery string) string {
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var q query
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if err := json.Unmarshal([]byte(rawQuery), &q); err != nil {
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return ""
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}
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escapedExpression := url.QueryEscape(q.Expr)
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escapedDatasource := url.QueryEscape(q.Datasource)
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return fmt.Sprintf(
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`/explore?left=["now-1h","now",%[1]q,{"datasource":%[1]q,"expr":%q,"instant":false,"range":true}]`, escapedDatasource, escapedExpression)
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}
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func tableLink(rawQuery string) string {
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var q query
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if err := json.Unmarshal([]byte(rawQuery), &q); err != nil {
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return ""
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}
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escapedExpression := url.QueryEscape(q.Expr)
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escapedDatasource := url.QueryEscape(q.Datasource)
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return fmt.Sprintf(
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`/explore?left=["now-1h","now",%[1]q,{"datasource":%[1]q,"expr":%q,"instant":true,"range":false}]`, escapedDatasource, escapedExpression)
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}
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