Add test for silence deletion

template/template.go

@@ -15,11 +15,16 @@ package template
 
 import (
 	"bytes"
+	"fmt"
 	"io"
+	"math"
 	"strings"
+	"time"
 
-	text_tmpl "html/template"
-	html_tmpl "text/template"
+	html_tmpl "html/template"
+	text_tmpl "text/template"
+
+	"github.com/prometheus/common/model"
 )
 
 type Template struct {
@@ -49,11 +54,6 @@ func FromGlobs(paths ...string) (*Template, error) {
 
 type FuncMap map[string]interface{}
 
-var DefaultFuncs = FuncMap{
-	"upper": strings.ToUpper,
-	"lower": strings.ToLower,
-}
-
 func (t *Template) funcs(fm FuncMap) *Template {
 	t.text.Funcs(text_tmpl.FuncMap(fm))
 	t.html.Funcs(html_tmpl.FuncMap(fm))
@@ -79,3 +79,102 @@ func (t *Template) ExecuteHTMLString(name string, data interface{}) (string, err
 func (t *Template) ExecuteHTML(w io.Writer, name string, data interface{}) error {
 	return t.html.ExecuteTemplate(w, name, data)
 }
+
+var DefaultFuncs = FuncMap{
+	"upper": strings.ToUpper,
+	"lower": strings.ToLower,
+	// safe marks a string as safe to be not HTML-escaped.
+	"safe": func(s string) html_tmpl.HTML {
+		return html_tmpl.HTML(s)
+	},
+	// commonLabels returns the labels that are equal across
+	// all given alerts.
+	"commonLabels": func(alerts model.Alerts) model.LabelSet {
+		if len(alerts) < 1 {
+			return model.LabelSet{}
+		}
+		common := alerts[0].Labels.Clone()
+
+		for _, a := range alerts[1:] {
+			for ln, lv := range common {
+				if a.Labels[ln] != lv {
+					delete(common, ln)
+				}
+			}
+		}
+
+		return common
+	},
+	// commonAnnotations returns the annotations that are equal across
+	// all given alerts.
+	"commonAnnotations": func(alerts model.Alerts) model.LabelSet {
+		if len(alerts) < 1 {
+			return model.LabelSet{}
+		}
+		common := alerts[0].Annotations.Clone()
+
+		for _, a := range alerts[1:] {
+			for ln, lv := range common {
+				if a.Annotations[ln] != lv {
+					delete(common, ln)
+				}
+			}
+		}
+
+		return common
+	},
+	// humanize returns a human-readable string representation of the value.
+	"humanize": func(v float64) string {
+		if v == 0 || math.IsNaN(v) || math.IsInf(v, 0) {
+			return fmt.Sprintf("%.4g", v)
+		}
+		if math.Abs(v) >= 1 {
+			prefix := ""
+			for _, p := range []string{"k", "M", "G", "T", "P", "E", "Z", "Y"} {
+				if math.Abs(v) < 1000 {
+					break
+				}
+				prefix = p
+				v /= 1000
+			}
+			return fmt.Sprintf("%.4g%s", v, prefix)
+		}
+		prefix := ""
+		for _, p := range []string{"m", "u", "n", "p", "f", "a", "z", "y"} {
+			if math.Abs(v) >= 1 {
+				break
+			}
+			prefix = p
+			v *= 1000
+		}
+		return fmt.Sprintf("%.4g%s", v, prefix)
+	},
+	"humanize1024": func(v float64) string {
+		if math.Abs(v) <= 1 || math.IsNaN(v) || math.IsInf(v, 0) {
+			return fmt.Sprintf("%.4g", v)
+		}
+		prefix := ""
+		for _, p := range []string{"ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi"} {
+			if math.Abs(v) < 1024 {
+				break
+			}
+			prefix = p
+			v /= 1024
+		}
+		return fmt.Sprintf("%.4g%s", v, prefix)
+	},
+	// duration returns a duration for the second value.
+	"duration": func(v float64) time.Duration {
+		if math.IsNaN(v) || math.IsInf(v, 0) {
+			return 0
+		}
+		return time.Duration(v) * time.Nanosecond
+	},
+	// time returns a time representation of the second value.
+	"time": func(v float64) time.Time {
+		if math.IsNaN(v) || math.IsInf(v, 0) {
+			return time.Time{}
+		}
+		return time.Unix(int64(v), 0)
+	},
+}