mirror of
https://github.com/prometheus/node_exporter
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1721de0c38
* collector: Unwrap glob textfile directories * collector: Store full path in mtime's file label The point is to avoid duplicated gauges from files with the same name in different directories. This introduces support for exporting from multiple directories matching given pattern (e.g. `/home/*/metrics/`). Signed-off-by: Kiril Vladimirov <kiril@vladimiroff.org>
133 lines
3.7 KiB
Go
133 lines
3.7 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/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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path: "fixtures/textfile/*_extra_dimension",
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out: "fixtures/textfile/glob_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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