prometheus/discovery/targetgroup/targetgroup_test.go

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// Copyright 2018 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.
package targetgroup
import (
"errors"
"testing"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/util/testutil"
"gopkg.in/yaml.v2"
)
func TestTargetGroupStrictJsonUnmarshal(t *testing.T) {
tests := []struct {
json string
expectedReply error
expectedTargets []model.LabelSet
}{
{
json: ` {"labels": {},"targets": []}`,
expectedReply: nil,
expectedTargets: []model.LabelSet{},
},
{
json: ` {"labels": {},"targets": ["localhost:9090","localhost:9091"]}`,
expectedReply: nil,
expectedTargets: []model.LabelSet{
model.LabelSet{"__address__": "localhost:9090"},
model.LabelSet{"__address__": "localhost:9091"}},
},
{
json: ` {"label": {},"targets": []}`,
expectedReply: errors.New("json: unknown field \"label\""),
expectedTargets: nil,
},
{
json: ` {"labels": {},"target": []}`,
expectedReply: errors.New("json: unknown field \"target\""),
expectedTargets: nil,
},
}
for _, test := range tests {
tg := Group{}
actual := tg.UnmarshalJSON([]byte(test.json))
testutil.Equals(t, test.expectedReply, actual)
testutil.Equals(t, test.expectedTargets, tg.Targets)
}
}
func TestTargetGroupYamlMarshal(t *testing.T) {
marshal := func(g interface{}) []byte {
d, err := yaml.Marshal(g)
if err != nil {
panic(err)
}
return d
}
tests := []struct {
expectedYaml string
expectetedErr error
group Group
}{
{
//labels should be omitted if empty
group: Group{},
expectedYaml: "targets: []\n",
expectetedErr: nil,
},
{
//targets only exposes addresses
group: Group{Targets: []model.LabelSet{
model.LabelSet{"__address__": "localhost:9090"},
model.LabelSet{"__address__": "localhost:9091"}},
Labels: model.LabelSet{"foo": "bar", "bar": "baz"}},
expectedYaml: "targets:\n- localhost:9090\n- localhost:9091\nlabels:\n bar: baz\n foo: bar\n",
expectetedErr: nil,
},
}
for _, test := range tests {
actual, err := test.group.MarshalYAML()
testutil.Equals(t, test.expectetedErr, err)
testutil.Equals(t, test.expectedYaml, string(marshal(actual)))
}
}
func TestTargetGroupYamlUnmarshal(t *testing.T) {
unmarshal := func(d []byte) func(interface{}) error {
return func(o interface{}) error {
return yaml.Unmarshal(d, o)
}
}
tests := []struct {
yaml string
expectedNumberOfTargets int
expectedNumberOfLabels int
expectedReply error
}{
{
//empty targe group
yaml: "labels:\ntargets:\n",
expectedNumberOfTargets: 0,
expectedNumberOfLabels: 0,
expectedReply: nil,
},
{
//brackets syntax
yaml: "labels:\n my: label\ntargets:\n ['localhost:9090', 'localhost:9191']",
expectedNumberOfTargets: 2,
expectedNumberOfLabels: 1,
expectedReply: nil,
},
{
//hyphen syntax
yaml: "targets:\n- localhost:9090\n- localhost:9091\nlabels:\n bar: baz\n foo: bar\n",
expectedNumberOfTargets: 2,
expectedNumberOfLabels: 2,
expectedReply: nil,
},
{
//incorrect syntax
yaml: "labels:\ntargets:\n 'localhost:9090'",
expectedNumberOfTargets: 0,
expectedNumberOfLabels: 0,
expectedReply: &yaml.TypeError{Errors: []string{"line 3: cannot unmarshal !!str `localho...` into []string"}},
},
}
for _, test := range tests {
tg := Group{}
actual := tg.UnmarshalYAML(unmarshal([]byte(test.yaml)))
testutil.Equals(t, test.expectedReply, actual)
testutil.Equals(t, test.expectedNumberOfTargets, len(tg.Targets))
testutil.Equals(t, test.expectedNumberOfLabels, len(tg.Labels))
}
}
func TestString(t *testing.T) {
//String() should return only the source, regardless of other attributes
group1 :=
Group{Targets: []model.LabelSet{
model.LabelSet{"__address__": "localhost:9090"},
model.LabelSet{"__address__": "localhost:9091"}},
Source: "<source>",
Labels: model.LabelSet{"foo": "bar", "bar": "baz"}}
group2 :=
Group{Targets: []model.LabelSet{},
Source: "<source>",
Labels: model.LabelSet{}}
testutil.Equals(t, "<source>", group1.String())
testutil.Equals(t, "<source>", group2.String())
testutil.Equals(t, group1.String(), group2.String())
}