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// Copyright 2015 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 collector
import (
"fmt"
"io/ioutil"
"net/http"
"net/http/httptest"
"testing"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"gopkg.in/alecthomas/kingpin.v2"
)
type collectorAdapter struct {
Collector
}
// Describe implements the prometheus.Collector interface.
func (a collectorAdapter) Describe(ch chan<- *prometheus.Desc) {
// We have to send *some* metric in Describe, but we don't know which ones
// we're going to get, so just send a dummy metric.
ch <- prometheus.NewDesc("dummy_metric", "Dummy metric.", nil, nil)
}
// Collect implements the prometheus.Collector interface.
func (a collectorAdapter) Collect(ch chan<- prometheus.Metric) {
if err := a.Update(ch); err != nil {
panic(fmt.Sprintf("failed to update collector: %v", err))
}
}
func TestTextfileCollector(t *testing.T) {
tests := []struct {
path string
out string
}{
{
path: "fixtures/textfile/no_metric_files",
out: "fixtures/textfile/no_metric_files.out",
},
{
path: "fixtures/textfile/two_metric_files",
out: "fixtures/textfile/two_metric_files.out",
},
{
path: "fixtures/textfile/nonexistent_path",
out: "fixtures/textfile/nonexistent_path.out",
},
{
path: "fixtures/textfile/client_side_timestamp",
out: "fixtures/textfile/client_side_timestamp.out",
},
{
path: "fixtures/textfile/different_metric_types",
out: "fixtures/textfile/different_metric_types.out",
},
{
path: "fixtures/textfile/inconsistent_metrics",
out: "fixtures/textfile/inconsistent_metrics.out",
},
{
path: "fixtures/textfile/histogram",
out: "fixtures/textfile/histogram.out",
},
{
path: "fixtures/textfile/histogram_extra_dimension",
out: "fixtures/textfile/histogram_extra_dimension.out",
},
{
path: "fixtures/textfile/summary",
out: "fixtures/textfile/summary.out",
},
{
path: "fixtures/textfile/summary_extra_dimension",
out: "fixtures/textfile/summary_extra_dimension.out",
},
}
for i, test := range tests {
mtime := 1.0
c := &textFileCollector{
path: test.path,
mtime: &mtime,
logger: log.NewNopLogger(),
}
// Suppress a log message about `nonexistent_path` not existing, this is
// expected and clutters the test output.
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
if _, err := kingpin.CommandLine.Parse([]string{"--log.level", "debug"}); err != nil {
t.Fatal(err)
}
registry := prometheus.NewRegistry()
registry.MustRegister(collectorAdapter{c})
rw := httptest.NewRecorder()
promhttp.HandlerFor(registry, promhttp.HandlerOpts{}).ServeHTTP(rw, &http.Request{})
got := string(rw.Body.String())
want, err := ioutil.ReadFile(test.out)
if err != nil {
t.Fatalf("%d. error reading fixture file %s: %s", i, test.out, err)
}
if string(want) != got {
t.Fatalf("%d.%q want:\n\n%s\n\ngot:\n\n%s", i, test.path, string(want), got)
}
}
}
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