prometheus/retrieval/target_test.go
Julius Volz 140eede5e0 Rename UNREACHABLE to UNHEALTHY.
The current wording suggests that a target is not reachable at all,
although it might also get set when the target was reachable, but there
was some other error during the scrape (invalid headers or invalid
scrape content). UNHEALTHY is a more general wording that includes all
these cases.

For consistency, ALIVE is also renamed to HEALTHY.
2015-03-07 23:18:18 +01:00

260 lines
6.8 KiB
Go

// Copyright 2013 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 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 TestTargetHidesURLAuth(t *testing.T) {
testVectors := []string{"http://secret:data@host.com/query?args#fragment", "https://example.net/foo", "http://foo.com:31337/bar"}
testResults := []string{"host.com:80", "example.net:443", "foo.com:31337"}
if len(testVectors) != len(testResults) {
t.Errorf("Test vector length does not match test result length.")
}
for i := 0; i < len(testVectors); i++ {
testTarget := target{
state: Unknown,
url: testVectors[i],
httpClient: utility.NewDeadlineClient(0),
}
u := testTarget.InstanceIdentifier()
if u != testResults[i] {
t.Errorf("Expected InstanceIdentifier to be %v, actual %v", testResults[i], u)
}
}
}
func TestTargetScrapeUpdatesState(t *testing.T) {
testTarget := target{
state: Unknown,
url: "bad schema",
httpClient: utility.NewDeadlineClient(0),
}
testTarget.scrape(nopIngester{})
if testTarget.state != Unhealthy {
t.Errorf("Expected target state %v, actual: %v", Unhealthy, testTarget.state)
}
}
func TestTargetScrapeWithFullChannel(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
w.Write([]byte("test_metric{foo=\"bar\"} 123.456\n"))
},
),
)
defer server.Close()
testTarget := NewTarget(
server.URL,
100*time.Millisecond,
clientmodel.LabelSet{"dings": "bums"},
).(*target)
testTarget.scrape(ChannelIngester(make(chan clientmodel.Samples))) // Capacity 0.
if testTarget.state != Unhealthy {
t.Errorf("Expected target state %v, actual: %v", Unhealthy, testTarget.state)
}
if testTarget.lastError != errIngestChannelFull {
t.Errorf("Expected target error %q, actual: %q", errIngestChannelFull, testTarget.lastError)
}
}
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: "example.url:80",
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: "example.url:80",
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", `text/plain; version=0.0.4`)
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.")
}
}
func BenchmarkScrape(b *testing.B) {
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
w.Write([]byte("test_metric{foo=\"bar\"} 123.456\n"))
},
),
)
defer server.Close()
testTarget := NewTarget(
server.URL,
100*time.Millisecond,
clientmodel.LabelSet{"dings": "bums"},
)
ingester := nopIngester{}
b.ResetTimer()
for i := 0; i < b.N; i++ {
if err := testTarget.(*target).scrape(ingester); err != nil {
b.Fatal(err)
}
}
}