node_exporter/collector/perf_linux_test.go

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// 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.
// +build !noprocesses
package collector
import (
"io/ioutil"
"strconv"
"strings"
"testing"
"github.com/prometheus/client_golang/prometheus"
)
func TestPerfCollector(t *testing.T) {
paranoidBytes, err := ioutil.ReadFile("/proc/sys/kernel/perf_event_paranoid")
if err != nil {
t.Skip("Procfs not mounted, skipping perf tests")
}
paranoidStr := strings.Replace(string(paranoidBytes), "\n", "", -1)
paranoid, err := strconv.Atoi(paranoidStr)
if err != nil {
t.Fatalf("Expected perf_event_paranoid to be an int, got: %s", paranoidStr)
}
if paranoid >= 1 {
t.Skip("Skipping perf tests, set perf_event_paranoid to 0")
}
collector, err := NewPerfCollector()
if err != nil {
t.Fatal(err)
}
// Setup background goroutine to capture metrics.
metrics := make(chan prometheus.Metric)
defer close(metrics)
go func() {
for range metrics {
}
}()
if err := collector.Update(metrics); err != nil {
t.Fatal(err)
}
}