mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-20 23:46:09 +01:00
129 lines
3.6 KiB
Go
129 lines
3.6 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"testing"
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"github.com/go-kit/kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/promlog"
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"github.com/prometheus/common/promlog/flag"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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type collectorAdapter struct {
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Collector
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}
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// Describe implements the prometheus.Collector interface.
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func (a collectorAdapter) Describe(ch chan<- *prometheus.Desc) {
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// We have to send *some* metric in Describe, but we don't know which ones
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// we're going to get, so just send a dummy metric.
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ch <- prometheus.NewDesc("dummy_metric", "Dummy metric.", nil, nil)
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}
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// Collect implements the prometheus.Collector interface.
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func (a collectorAdapter) Collect(ch chan<- prometheus.Metric) {
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if err := a.Update(ch); err != nil {
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panic(fmt.Sprintf("failed to update collector: %v", err))
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}
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}
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func TestTextfileCollector(t *testing.T) {
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tests := []struct {
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path string
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out string
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}{
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{
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path: "fixtures/textfile/no_metric_files",
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out: "fixtures/textfile/no_metric_files.out",
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},
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{
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path: "fixtures/textfile/two_metric_files",
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out: "fixtures/textfile/two_metric_files.out",
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},
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{
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path: "fixtures/textfile/nonexistent_path",
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out: "fixtures/textfile/nonexistent_path.out",
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},
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{
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path: "fixtures/textfile/client_side_timestamp",
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out: "fixtures/textfile/client_side_timestamp.out",
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},
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{
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path: "fixtures/textfile/different_metric_types",
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out: "fixtures/textfile/different_metric_types.out",
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},
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{
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path: "fixtures/textfile/inconsistent_metrics",
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out: "fixtures/textfile/inconsistent_metrics.out",
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},
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{
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path: "fixtures/textfile/histogram",
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out: "fixtures/textfile/histogram.out",
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},
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{
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path: "fixtures/textfile/histogram_extra_dimension",
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out: "fixtures/textfile/histogram_extra_dimension.out",
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},
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{
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path: "fixtures/textfile/summary",
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out: "fixtures/textfile/summary.out",
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},
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{
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path: "fixtures/textfile/summary_extra_dimension",
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out: "fixtures/textfile/summary_extra_dimension.out",
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},
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}
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for i, test := range tests {
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mtime := 1.0
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c := &textFileCollector{
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path: test.path,
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mtime: &mtime,
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logger: log.NewNopLogger(),
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}
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// Suppress a log message about `nonexistent_path` not existing, this is
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// expected and clutters the test output.
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promlogConfig := &promlog.Config{}
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flag.AddFlags(kingpin.CommandLine, promlogConfig)
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if _, err := kingpin.CommandLine.Parse([]string{"--log.level", "debug"}); err != nil {
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t.Fatal(err)
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}
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registry := prometheus.NewRegistry()
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registry.MustRegister(collectorAdapter{c})
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rw := httptest.NewRecorder()
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promhttp.HandlerFor(registry, promhttp.HandlerOpts{}).ServeHTTP(rw, &http.Request{})
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got := string(rw.Body.String())
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want, err := ioutil.ReadFile(test.out)
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if err != nil {
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t.Fatalf("%d. error reading fixture file %s: %s", i, test.out, err)
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}
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if string(want) != got {
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t.Fatalf("%d.%q want:\n\n%s\n\ngot:\n\n%s", i, test.path, string(want), got)
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}
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}
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}
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