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 (
"context"
"math"
"net/url"
"testing"
"time"
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"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/util/testutil"
)
type testTemplatesScenario struct {
text string
output string
input interface{}
queryResult promql.Vector
shouldFail bool
html bool
errorMsg string
}
func TestTemplateExpansion(t *testing.T) {
scenarios := []testTemplatesScenario{
{
// No template.
text: "plain text",
output: "plain text",
},
{
// Simple value.
text: "{{ 1 }}",
output: "1",
},
{
// Non-ASCII space (not allowed in text/template, see https://github.com/golang/go/blob/master/src/text/template/parse/lex.go#L98)
text: "{{ }}",
shouldFail: true,
errorMsg: "error parsing template test: template: test:1: unexpected unrecognized character in action: U+00A0 in command",
},
{
// 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",
queryResult: promql.Vector{{Point: promql.Point{T: 0, V: 1.5}}},
},
{
// Get value from query.
text: "{{ query \"metric{instance='a'}\" | first | value }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "11",
},
{
// Get label from query.
text: "{{ query \"metric{instance='a'}\" | first | label \"instance\" }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "a",
},
{
// Missing label is empty when using label function.
text: "{{ query \"metric{instance='a'}\" | first | label \"foo\" }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "",
},
{
// Missing label is empty when not using label function.
text: "{{ $x := query \"metric\" | first }}{{ $x.Labels.foo }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "",
},
{
text: "{{ $x := query \"metric\" | first }}{{ $x.Labels.foo }}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}},
output: "",
html: true,
},
{
// Range over query and sort by label.
text: "{{ range query \"metric\" | sortByLabel \"instance\" }}{{.Labels.instance}}:{{.Value}}: {{end}}",
queryResult: promql.Vector{
{
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "a"),
Point: promql.Point{T: 0, V: 11},
}, {
Metric: labels.FromStrings(labels.MetricName, "metric", "instance", "b"),
Point: promql.Point{T: 0, V: 21},
}},
output: "a:11: b:21: ",
},
{
// Unparsable template.
text: "{{",
shouldFail: true,
errorMsg: "error parsing template test: template: test:1: unexpected unclosed action in command",
},
{
// Error in function.
text: "{{ query \"missing\" | first }}",
queryResult: promql.Vector{},
shouldFail: true,
errorMsg: "error executing template test: template: test:1:21: executing \"test\" at <first>: error calling first: first() called on vector with no elements",
},
{
// Panic.
text: "{{ (query \"missing\").banana }}",
queryResult: promql.Vector{},
shouldFail: true,
errorMsg: "error executing template test: template: test:1:10: executing \"test\" at <\"missing\">: can't evaluate field banana in type template.queryResult",
},
{
// 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",
},
{
// toUpper.
text: "{{ \"aa bb CC\" | toUpper }}",
output: "AA BB CC",
},
{
// toLower.
text: "{{ \"aA bB CC\" | toLower }}",
output: "aa bb cc",
},
{
// Match.
text: "{{ match \"a+\" \"aa\" }} {{ match \"a+\" \"b\" }}",
output: "true false",
},
{
// graphLink.
text: "{{ graphLink \"up\" }}",
output: "/graph?g0.expr=up&g0.tab=0",
},
{
// tableLink.
text: "{{ tableLink \"up\" }}",
output: "/graph?g0.expr=up&g0.tab=1",
},
{
// tmpl.
text: "{{ define \"a\" }}x{{ end }}{{ $name := \"a\"}}{{ tmpl $name . }}",
output: "x",
html: true,
},
{
// pathPrefix.
text: "{{ pathPrefix }}",
output: "/path/prefix",
},
{
// externalURL.
text: "{{ externalURL }}",
output: "http://testhost:9090/path/prefix",
},
}
extURL, err := url.Parse("http://testhost:9090/path/prefix")
if err != nil {
panic(err)
}
for _, s := range scenarios {
queryFunc := func(_ context.Context, _ string, _ time.Time) (promql.Vector, error) {
return s.queryResult, nil
}
var result string
var err error
expander := NewTemplateExpander(context.Background(), s.text, "test", s.input, 0, queryFunc, extURL)
if s.html {
result, err = expander.ExpandHTML(nil)
} else {
result, err = expander.Expand()
}
if s.shouldFail {
testutil.NotOk(t, err, "%v", s.text)
continue
}
testutil.Ok(t, err)
if err == nil {
testutil.Equals(t, result, s.output)
}
}
}