prometheus/discovery/refresh/refresh_test.go

98 lines
2.0 KiB
Go

// Copyright 2019 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 refresh
import (
"context"
"fmt"
"testing"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/stretchr/testify/require"
"go.uber.org/goleak"
"github.com/prometheus/prometheus/discovery/targetgroup"
)
func TestMain(m *testing.M) {
goleak.VerifyTestMain(m)
}
func TestRefresh(t *testing.T) {
tg1 := []*targetgroup.Group{
{
Source: "tg",
Targets: []model.LabelSet{
{
model.LabelName("t1"): model.LabelValue("v1"),
},
{
model.LabelName("t2"): model.LabelValue("v2"),
},
},
Labels: model.LabelSet{
model.LabelName("l1"): model.LabelValue("lv1"),
},
},
}
tg2 := []*targetgroup.Group{
{
Source: "tg",
},
}
var i int
refresh := func(ctx context.Context) ([]*targetgroup.Group, error) {
i++
switch i {
case 1:
return tg1, nil
case 2:
return tg2, nil
}
return nil, fmt.Errorf("some error")
}
interval := time.Millisecond
d := NewDiscovery(
Options{
Logger: nil,
Mech: "test",
Interval: interval,
RefreshF: refresh,
Registry: prometheus.NewRegistry(),
},
)
ch := make(chan []*targetgroup.Group)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go d.Run(ctx, ch)
tg := <-ch
require.Equal(t, tg1, tg)
tg = <-ch
require.Equal(t, tg2, tg)
tick := time.NewTicker(2 * interval)
defer tick.Stop()
select {
case <-ch:
t.Fatal("Unexpected target group")
case <-tick.C:
}
}