prometheus/retrieval/target_test.go
2015-01-08 16:34:01 +01:00

182 lines
4.8 KiB
Go

// Copyright 2013 Prometheus Team
// 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 retrieval
import (
"errors"
"net/http"
"net/http/httptest"
"testing"
"time"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/utility"
)
type collectResultIngester struct {
result clientmodel.Samples
}
func (i *collectResultIngester) Ingest(s clientmodel.Samples) error {
i.result = s
return nil
}
func TestTargetScrapeUpdatesState(t *testing.T) {
testTarget := target{
state: Unknown,
url: "bad schema",
httpClient: utility.NewDeadlineClient(0),
}
testTarget.scrape(nopIngester{})
if testTarget.state != Unreachable {
t.Errorf("Expected target state %v, actual: %v", Unreachable, testTarget.state)
}
}
func TestTargetRecordScrapeHealth(t *testing.T) {
testTarget := target{
url: "http://example.url",
baseLabels: clientmodel.LabelSet{clientmodel.JobLabel: "testjob"},
httpClient: utility.NewDeadlineClient(0),
}
now := clientmodel.Now()
ingester := &collectResultIngester{}
testTarget.recordScrapeHealth(ingester, now, true, 2*time.Second)
result := ingester.result
if len(result) != 2 {
t.Fatalf("Expected two samples, got %d", len(result))
}
actual := result[0]
expected := &clientmodel.Sample{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: scrapeHealthMetricName,
InstanceLabel: "http://example.url",
clientmodel.JobLabel: "testjob",
},
Timestamp: now,
Value: 1,
}
if !actual.Equal(expected) {
t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
}
actual = result[1]
expected = &clientmodel.Sample{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: scrapeDurationMetricName,
InstanceLabel: "http://example.url",
clientmodel.JobLabel: "testjob",
},
Timestamp: now,
Value: 2.0,
}
if !actual.Equal(expected) {
t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
}
}
func TestTargetScrapeTimeout(t *testing.T) {
signal := make(chan bool, 1)
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
<-signal
w.Header().Set("Content-Type", `application/json; schema="prometheus/telemetry"; version=0.0.2`)
w.Write([]byte(`[]`))
}))
defer server.Close()
testTarget := NewTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
ingester := nopIngester{}
// scrape once without timeout
signal <- true
if err := testTarget.(*target).scrape(ingester); err != nil {
t.Fatal(err)
}
// let the deadline lapse
time.Sleep(15 * time.Millisecond)
// now scrape again
signal <- true
if err := testTarget.(*target).scrape(ingester); err != nil {
t.Fatal(err)
}
// now timeout
if err := testTarget.(*target).scrape(ingester); err == nil {
t.Fatal("expected scrape to timeout")
} else {
signal <- true // let handler continue
}
// now scrape again without timeout
signal <- true
if err := testTarget.(*target).scrape(ingester); err != nil {
t.Fatal(err)
}
}
func TestTargetScrape404(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotFound)
}))
defer server.Close()
testTarget := NewTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
ingester := nopIngester{}
want := errors.New("server returned HTTP status 404 Not Found")
got := testTarget.(*target).scrape(ingester)
if got == nil || want.Error() != got.Error() {
t.Fatalf("want err %q, got %q", want, got)
}
}
func TestTargetRunScraperScrapes(t *testing.T) {
testTarget := target{
state: Unknown,
url: "bad schema",
httpClient: utility.NewDeadlineClient(0),
scraperStopping: make(chan struct{}),
scraperStopped: make(chan struct{}),
}
go testTarget.RunScraper(nopIngester{}, time.Duration(time.Millisecond))
// Enough time for a scrape to happen.
time.Sleep(2 * time.Millisecond)
if testTarget.lastScrape.IsZero() {
t.Errorf("Scrape hasn't occured.")
}
testTarget.StopScraper()
// Wait for it to take effect.
time.Sleep(2 * time.Millisecond)
last := testTarget.lastScrape
// Enough time for a scrape to happen.
time.Sleep(2 * time.Millisecond)
if testTarget.lastScrape != last {
t.Errorf("Scrape occured after it was stopped.")
}
}