prometheus/template/template_test.go

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// Copyright 2014 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package template
import (
"math"
"testing"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/storage/local"
)
type testTemplatesScenario struct {
text string
output string
input interface{}
shouldFail bool
html bool
}
func TestTemplateExpansion(t *testing.T) {
scenarios := []testTemplatesScenario{
{
// No template.
text: "plain text",
output: "plain text",
},
{
// Simple value.
text: "{{ 1 }}",
output: "1",
},
{
// HTML escaping.
text: "{{ \"<b>\" }}",
output: "&lt;b&gt;",
html: true,
},
{
// Disabling HTML escaping.
text: "{{ \"<b>\" | safeHtml }}",
output: "<b>",
html: true,
},
{
// HTML escaping doesn't apply to non-html.
text: "{{ \"<b>\" }}",
output: "<b>",
},
{
// Pass multiple arguments to templates.
text: "{{define \"x\"}}{{.arg0}} {{.arg1}}{{end}}{{template \"x\" (args 1 \"2\")}}",
output: "1 2",
},
{
text: "{{ query \"1.5\" | first | value }}",
output: "1.5",
},
{
// Get value from scalar query.
text: "{{ query \"scalar(count(metric))\" | first | value }}",
output: "2",
},
{
// Get value from query.
text: "{{ query \"metric{instance='a'}\" | first | value }}",
output: "11",
},
{
// Get label from query.
text: "{{ query \"metric{instance='a'}\" | first | label \"instance\" }}",
output: "a",
},
{
// Range over query and sort by label.
text: "{{ range query \"metric\" | sortByLabel \"instance\" }}{{.Labels.instance}}:{{.Value}}: {{end}}",
output: "a:11: b:21: ",
},
{
// Unparsable template.
text: "{{",
shouldFail: true,
},
{
// Error in function.
text: "{{ query \"missing\" | first }}",
shouldFail: true,
},
{
// Panic.
text: "{{ (query \"missing\").banana }}",
shouldFail: true,
},
{
// Regex replacement.
text: "{{ reReplaceAll \"(a)b\" \"x$1\" \"ab\" }}",
output: "xa",
},
{
// Humanize.
text: "{{ range . }}{{ humanize . }}:{{ end }}",
input: []float64{0.0, 1.0, 1234567.0, .12},
output: "0:1:1.235M:120m:",
},
{
// Humanize1024.
text: "{{ range . }}{{ humanize1024 . }}:{{ end }}",
input: []float64{0.0, 1.0, 1048576.0, .12},
output: "0:1:1Mi:0.12:",
},
{
// HumanizeDuration - seconds.
text: "{{ range . }}{{ humanizeDuration . }}:{{ end }}",
input: []float64{0, 1, 60, 3600, 86400, 86400 + 3600, -(86400*2 + 3600*3 + 60*4 + 5), 899.99},
output: "0s:1s:1m 0s:1h 0m 0s:1d 0h 0m 0s:1d 1h 0m 0s:-2d 3h 4m 5s:14m 59s:",
},
{
// HumanizeDuration - subsecond and fractional seconds.
text: "{{ range . }}{{ humanizeDuration . }}:{{ end }}",
input: []float64{.1, .0001, .12345, 60.1, 60.5, 1.2345, 12.345},
output: "100ms:100us:123.5ms:1m 0s:1m 0s:1.234s:12.35s:",
},
{
// Humanize* Inf and NaN.
text: "{{ range . }}{{ humanize . }}:{{ humanize1024 . }}:{{ humanizeDuration . }}:{{humanizeTimestamp .}}:{{ end }}",
input: []float64{math.Inf(1), math.Inf(-1), math.NaN()},
output: "+Inf:+Inf:+Inf:+Inf:-Inf:-Inf:-Inf:-Inf:NaN:NaN:NaN:NaN:",
},
{
// HumanizeTimestamp - model.SampleValue input.
text: "{{ 1435065584.128 | humanizeTimestamp }}",
output: "2015-06-23 13:19:44.128 +0000 UTC",
},
{
// Title.
text: "{{ \"aa bb CC\" | title }}",
output: "Aa Bb CC",
},
{
// Match.
text: "{{ match \"a+\" \"aa\" }} {{ match \"a+\" \"b\" }}",
output: "true false",
},
{
// graphLink.
text: "{{ graphLink \"up\" }}",
output: "/graph#%5B%7B%22expr%22%3A%22up%22%2C%22tab%22%3A0%7D%5D",
},
{
// tableLink.
text: "{{ tableLink \"up\" }}",
output: "/graph#%5B%7B%22expr%22%3A%22up%22%2C%22tab%22%3A1%7D%5D",
},
{
// tmpl.
text: "{{ define \"a\" }}x{{ end }}{{ $name := \"a\"}}{{ tmpl $name . }}",
output: "x",
html: true,
},
}
time := model.Time(0)
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storage, closer := local.NewTestStorage(t, 1)
defer closer.Close()
storage.Append(&model.Sample{
Metric: model.Metric{
model.MetricNameLabel: "metric",
"instance": "a"},
Value: 11,
})
storage.Append(&model.Sample{
Metric: model.Metric{
model.MetricNameLabel: "metric",
"instance": "b"},
Value: 21,
})
storage.WaitForIndexing()
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engine := promql.NewEngine(storage, nil)
for i, s := range scenarios {
var result string
var err error
expander := NewTemplateExpander(s.text, "test", s.input, time, engine, "")
if s.html {
result, err = expander.ExpandHTML(nil)
} else {
result, err = expander.Expand()
}
if s.shouldFail {
if err == nil {
t.Fatalf("%d. Error not returned from %v", i, s.text)
}
continue
}
if err != nil {
t.Fatalf("%d. Error returned from %v: %v", i, s.text, err)
continue
}
if result != s.output {
t.Fatalf("%d. Error in result from %v: Expected '%v' Got '%v'", i, s.text, s.output, result)
continue
}
}
}