prometheus/notifier/notifier_test.go

1020 lines
25 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 notifier
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/http/httptest"
"net/url"
"strconv"
"testing"
"time"
"github.com/go-kit/log"
"github.com/prometheus/alertmanager/api/v2/models"
"github.com/prometheus/client_golang/prometheus"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"github.com/stretchr/testify/require"
"go.uber.org/atomic"
"gopkg.in/yaml.v2"
"github.com/prometheus/prometheus/discovery"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/discovery/targetgroup"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/relabel"
)
func TestPostPath(t *testing.T) {
cases := []struct {
in, out string
}{
{
in: "",
out: "/api/v1/alerts",
},
{
in: "/",
out: "/api/v1/alerts",
},
{
in: "/prefix",
out: "/prefix/api/v1/alerts",
},
{
in: "/prefix//",
out: "/prefix/api/v1/alerts",
},
{
in: "prefix//",
out: "/prefix/api/v1/alerts",
},
}
for _, c := range cases {
require.Equal(t, c.out, postPath(c.in, config.AlertmanagerAPIVersionV1))
}
}
func TestHandlerNextBatch(t *testing.T) {
h := NewManager(&Options{}, nil)
for i := range make([]struct{}, 2*maxBatchSize+1) {
h.queue = append(h.queue, &Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
})
}
expected := append([]*Alert{}, h.queue...)
require.NoError(t, alertsEqual(expected[0:maxBatchSize], h.nextBatch()))
require.NoError(t, alertsEqual(expected[maxBatchSize:2*maxBatchSize], h.nextBatch()))
require.NoError(t, alertsEqual(expected[2*maxBatchSize:], h.nextBatch()))
require.Empty(t, h.queue, "Expected queue to be empty but got %d alerts", len(h.queue))
}
func alertsEqual(a, b []*Alert) error {
if len(a) != len(b) {
return fmt.Errorf("length mismatch: %v != %v", a, b)
}
for i, alert := range a {
if !labels.Equal(alert.Labels, b[i].Labels) {
return fmt.Errorf("label mismatch at index %d: %s != %s", i, alert.Labels, b[i].Labels)
}
}
return nil
}
func newTestHTTPServerBuilder(expected *[]*Alert, errc chan<- error, u, p string, status *atomic.Int32) *httptest.Server {
return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var err error
defer func() {
if err == nil {
return
}
select {
case errc <- err:
default:
}
}()
user, pass, _ := r.BasicAuth()
if user != u || pass != p {
err = fmt.Errorf("unexpected user/password: %s/%s != %s/%s", user, pass, u, p)
w.WriteHeader(http.StatusInternalServerError)
return
}
b, err := io.ReadAll(r.Body)
if err != nil {
err = fmt.Errorf("error reading body: %w", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
var alerts []*Alert
err = json.Unmarshal(b, &alerts)
if err == nil {
err = alertsEqual(*expected, alerts)
}
w.WriteHeader(int(status.Load()))
}))
}
func TestHandlerSendAll(t *testing.T) {
var (
errc = make(chan error, 1)
expected = make([]*Alert, 0, maxBatchSize)
status1, status2 atomic.Int32
)
status1.Store(int32(http.StatusOK))
status2.Store(int32(http.StatusOK))
server1 := newTestHTTPServerBuilder(&expected, errc, "prometheus", "testing_password", &status1)
server2 := newTestHTTPServerBuilder(&expected, errc, "", "", &status2)
defer server1.Close()
defer server2.Close()
h := NewManager(&Options{}, nil)
authClient, _ := config_util.NewClientFromConfig(
config_util.HTTPClientConfig{
BasicAuth: &config_util.BasicAuth{
Username: "prometheus",
Password: "testing_password",
},
}, "auth_alertmanager")
h.alertmanagers = make(map[string]*alertmanagerSet)
am1Cfg := config.DefaultAlertmanagerConfig
am1Cfg.Timeout = model.Duration(time.Second)
am2Cfg := config.DefaultAlertmanagerConfig
am2Cfg.Timeout = model.Duration(time.Second)
h.alertmanagers["1"] = &alertmanagerSet{
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server1.URL },
},
},
cfg: &am1Cfg,
client: authClient,
}
h.alertmanagers["2"] = &alertmanagerSet{
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server2.URL },
},
},
cfg: &am2Cfg,
}
for i := range make([]struct{}, maxBatchSize) {
h.queue = append(h.queue, &Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
})
expected = append(expected, &Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
})
}
checkNoErr := func() {
t.Helper()
select {
case err := <-errc:
require.NoError(t, err)
default:
}
}
require.True(t, h.sendAll(h.queue...), "all sends failed unexpectedly")
checkNoErr()
status1.Store(int32(http.StatusNotFound))
require.True(t, h.sendAll(h.queue...), "all sends failed unexpectedly")
checkNoErr()
status2.Store(int32(http.StatusInternalServerError))
require.False(t, h.sendAll(h.queue...), "all sends succeeded unexpectedly")
checkNoErr()
}
func TestHandlerSendAllRemapPerAm(t *testing.T) {
var (
errc = make(chan error, 1)
expected1 = make([]*Alert, 0, maxBatchSize)
expected2 = make([]*Alert, 0, maxBatchSize)
expected3 = make([]*Alert, 0)
statusOK atomic.Int32
)
statusOK.Store(int32(http.StatusOK))
server1 := newTestHTTPServerBuilder(&expected1, errc, "", "", &statusOK)
server2 := newTestHTTPServerBuilder(&expected2, errc, "", "", &statusOK)
server3 := newTestHTTPServerBuilder(&expected3, errc, "", "", &statusOK)
defer server1.Close()
defer server2.Close()
defer server3.Close()
h := NewManager(&Options{}, nil)
h.alertmanagers = make(map[string]*alertmanagerSet)
am1Cfg := config.DefaultAlertmanagerConfig
am1Cfg.Timeout = model.Duration(time.Second)
am2Cfg := config.DefaultAlertmanagerConfig
am2Cfg.Timeout = model.Duration(time.Second)
am2Cfg.AlertRelabelConfigs = []*relabel.Config{
{
SourceLabels: model.LabelNames{"alertnamedrop"},
Action: "drop",
Regex: relabel.MustNewRegexp(".+"),
},
}
am3Cfg := config.DefaultAlertmanagerConfig
am3Cfg.Timeout = model.Duration(time.Second)
am3Cfg.AlertRelabelConfigs = []*relabel.Config{
{
SourceLabels: model.LabelNames{"alertname"},
Action: "drop",
Regex: relabel.MustNewRegexp(".+"),
},
}
h.alertmanagers = map[string]*alertmanagerSet{
// Drop no alerts.
"1": {
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server1.URL },
},
},
cfg: &am1Cfg,
},
// Drop only alerts with the "alertnamedrop" label.
"2": {
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server2.URL },
},
},
cfg: &am2Cfg,
},
// Drop all alerts.
"3": {
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server3.URL },
},
},
cfg: &am3Cfg,
},
// Empty list of Alertmanager endpoints.
"4": {
ams: []alertmanager{},
cfg: &config.DefaultAlertmanagerConfig,
},
}
for i := range make([]struct{}, maxBatchSize/2) {
h.queue = append(h.queue,
&Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
},
&Alert{
Labels: labels.FromStrings("alertname", "test", "alertnamedrop", strconv.Itoa(i)),
},
)
expected1 = append(expected1,
&Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
}, &Alert{
Labels: labels.FromStrings("alertname", "test", "alertnamedrop", strconv.Itoa(i)),
},
)
expected2 = append(expected2, &Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
})
}
checkNoErr := func() {
t.Helper()
select {
case err := <-errc:
require.NoError(t, err)
default:
}
}
require.True(t, h.sendAll(h.queue...), "all sends failed unexpectedly")
checkNoErr()
// Verify that individual locks are released.
for k := range h.alertmanagers {
h.alertmanagers[k].mtx.Lock()
h.alertmanagers[k].ams = nil
h.alertmanagers[k].mtx.Unlock()
}
}
func TestCustomDo(t *testing.T) {
const testURL = "http://testurl.com/"
const testBody = "testbody"
var received bool
h := NewManager(&Options{
Do: func(_ context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
received = true
body, err := io.ReadAll(req.Body)
require.NoError(t, err)
require.Equal(t, testBody, string(body))
require.Equal(t, testURL, req.URL.String())
return &http.Response{
Body: io.NopCloser(bytes.NewBuffer(nil)),
}, nil
},
}, nil)
h.sendOne(context.Background(), nil, testURL, []byte(testBody))
require.True(t, received, "Expected to receive an alert, but didn't")
}
func TestExternalLabels(t *testing.T) {
h := NewManager(&Options{
QueueCapacity: 3 * maxBatchSize,
ExternalLabels: labels.FromStrings("a", "b"),
RelabelConfigs: []*relabel.Config{
{
SourceLabels: model.LabelNames{"alertname"},
TargetLabel: "a",
Action: "replace",
Regex: relabel.MustNewRegexp("externalrelabelthis"),
Replacement: "c",
},
},
}, nil)
// This alert should get the external label attached.
h.Send(&Alert{
Labels: labels.FromStrings("alertname", "test"),
})
// This alert should get the external label attached, but then set to "c"
// through relabelling.
h.Send(&Alert{
Labels: labels.FromStrings("alertname", "externalrelabelthis"),
})
expected := []*Alert{
{Labels: labels.FromStrings("alertname", "test", "a", "b")},
{Labels: labels.FromStrings("alertname", "externalrelabelthis", "a", "c")},
}
require.NoError(t, alertsEqual(expected, h.queue))
}
func TestHandlerRelabel(t *testing.T) {
h := NewManager(&Options{
QueueCapacity: 3 * maxBatchSize,
RelabelConfigs: []*relabel.Config{
{
SourceLabels: model.LabelNames{"alertname"},
Action: "drop",
Regex: relabel.MustNewRegexp("drop"),
},
{
SourceLabels: model.LabelNames{"alertname"},
TargetLabel: "alertname",
Action: "replace",
Regex: relabel.MustNewRegexp("rename"),
Replacement: "renamed",
},
},
}, nil)
// This alert should be dropped due to the configuration
h.Send(&Alert{
Labels: labels.FromStrings("alertname", "drop"),
})
// This alert should be replaced due to the configuration
h.Send(&Alert{
Labels: labels.FromStrings("alertname", "rename"),
})
expected := []*Alert{
{Labels: labels.FromStrings("alertname", "renamed")},
}
require.NoError(t, alertsEqual(expected, h.queue))
}
func TestHandlerQueuing(t *testing.T) {
var (
expectedc = make(chan []*Alert)
called = make(chan struct{})
done = make(chan struct{})
errc = make(chan error, 1)
)
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Notify the test function that we have received something.
select {
case called <- struct{}{}:
case <-done:
return
}
// Wait for the test function to unblock us.
select {
case expected := <-expectedc:
var alerts []*Alert
b, err := io.ReadAll(r.Body)
if err != nil {
panic(err)
}
err = json.Unmarshal(b, &alerts)
if err == nil {
err = alertsEqual(expected, alerts)
}
select {
case errc <- err:
default:
}
case <-done:
}
}))
defer func() {
close(done)
server.Close()
}()
h := NewManager(
&Options{
QueueCapacity: 3 * maxBatchSize,
},
nil,
)
h.alertmanagers = make(map[string]*alertmanagerSet)
am1Cfg := config.DefaultAlertmanagerConfig
am1Cfg.Timeout = model.Duration(time.Second)
h.alertmanagers["1"] = &alertmanagerSet{
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server.URL },
},
},
cfg: &am1Cfg,
}
go h.Run(nil)
defer h.Stop()
var alerts []*Alert
for i := range make([]struct{}, 20*maxBatchSize) {
alerts = append(alerts, &Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
})
}
assertAlerts := func(expected []*Alert) {
t.Helper()
for {
select {
case <-called:
expectedc <- expected
case err := <-errc:
require.NoError(t, err)
return
case <-time.After(5 * time.Second):
require.FailNow(t, "Alerts were not pushed.")
}
}
}
// If the batch is larger than the queue capacity, it should be truncated
// from the front.
h.Send(alerts[:4*maxBatchSize]...)
for i := 1; i < 4; i++ {
assertAlerts(alerts[i*maxBatchSize : (i+1)*maxBatchSize])
}
// Send one batch, wait for it to arrive and block the server so the queue fills up.
h.Send(alerts[:maxBatchSize]...)
<-called
// Send several batches while the server is still blocked so the queue
// fills up to its maximum capacity (3*maxBatchSize). Then check that the
// queue is truncated in the front.
h.Send(alerts[1*maxBatchSize : 2*maxBatchSize]...) // this batch should be dropped.
h.Send(alerts[2*maxBatchSize : 3*maxBatchSize]...)
h.Send(alerts[3*maxBatchSize : 4*maxBatchSize]...)
// Send the batch that drops the first one.
h.Send(alerts[4*maxBatchSize : 5*maxBatchSize]...)
// Unblock the server.
expectedc <- alerts[:maxBatchSize]
select {
case err := <-errc:
require.NoError(t, err)
case <-time.After(5 * time.Second):
require.FailNow(t, "Alerts were not pushed.")
}
// Verify that we receive the last 3 batches.
for i := 2; i < 5; i++ {
assertAlerts(alerts[i*maxBatchSize : (i+1)*maxBatchSize])
}
}
type alertmanagerMock struct {
urlf func() string
}
func (a alertmanagerMock) url() *url.URL {
u, err := url.Parse(a.urlf())
if err != nil {
panic(err)
}
return u
}
func TestLabelSetNotReused(t *testing.T) {
tg := makeInputTargetGroup()
_, _, err := AlertmanagerFromGroup(tg, &config.AlertmanagerConfig{})
require.NoError(t, err)
// Target modified during alertmanager extraction
require.Equal(t, tg, makeInputTargetGroup())
}
func TestReload(t *testing.T) {
tests := []struct {
in *targetgroup.Group
out string
}{
{
in: &targetgroup.Group{
Targets: []model.LabelSet{
{
"__address__": "alertmanager:9093",
},
},
},
out: "http://alertmanager:9093/api/v2/alerts",
},
}
n := NewManager(&Options{}, nil)
cfg := &config.Config{}
s := `
alerting:
alertmanagers:
- static_configs:
`
err := yaml.UnmarshalStrict([]byte(s), cfg)
require.NoError(t, err, "Unable to load YAML config.")
require.Len(t, cfg.AlertingConfig.AlertmanagerConfigs, 1)
err = n.ApplyConfig(cfg)
require.NoError(t, err, "Error applying the config.")
tgs := make(map[string][]*targetgroup.Group)
for _, tt := range tests {
for k := range cfg.AlertingConfig.AlertmanagerConfigs.ToMap() {
tgs[k] = []*targetgroup.Group{
tt.in,
}
break
}
n.reload(tgs)
res := n.Alertmanagers()[0].String()
require.Equal(t, tt.out, res)
}
}
func TestDroppedAlertmanagers(t *testing.T) {
tests := []struct {
in *targetgroup.Group
out string
}{
{
in: &targetgroup.Group{
Targets: []model.LabelSet{
{
"__address__": "alertmanager:9093",
},
},
},
out: "http://alertmanager:9093/api/v2/alerts",
},
}
n := NewManager(&Options{}, nil)
cfg := &config.Config{}
s := `
alerting:
alertmanagers:
- static_configs:
relabel_configs:
- source_labels: ['__address__']
regex: 'alertmanager:9093'
action: drop
`
err := yaml.UnmarshalStrict([]byte(s), cfg)
require.NoError(t, err, "Unable to load YAML config.")
require.Len(t, cfg.AlertingConfig.AlertmanagerConfigs, 1)
err = n.ApplyConfig(cfg)
require.NoError(t, err, "Error applying the config.")
tgs := make(map[string][]*targetgroup.Group)
for _, tt := range tests {
for k := range cfg.AlertingConfig.AlertmanagerConfigs.ToMap() {
tgs[k] = []*targetgroup.Group{
tt.in,
}
break
}
n.reload(tgs)
res := n.DroppedAlertmanagers()[0].String()
require.Equal(t, res, tt.out)
}
}
func makeInputTargetGroup() *targetgroup.Group {
return &targetgroup.Group{
Targets: []model.LabelSet{
{
model.AddressLabel: model.LabelValue("1.1.1.1:9090"),
model.LabelName("notcommon1"): model.LabelValue("label"),
},
},
Labels: model.LabelSet{
model.LabelName("common"): model.LabelValue("label"),
},
Source: "testsource",
}
}
func TestLabelsToOpenAPILabelSet(t *testing.T) {
require.Equal(t, models.LabelSet{"aaa": "111", "bbb": "222"}, labelsToOpenAPILabelSet(labels.FromStrings("aaa", "111", "bbb", "222")))
}
// TestHangingNotifier ensures that the notifier takes into account SD changes even when there are
// queued alerts. This test reproduces the issue described in https://github.com/prometheus/prometheus/issues/13676.
// and https://github.com/prometheus/prometheus/issues/8768.
func TestHangingNotifier(t *testing.T) {
const (
batches = 100
alertsCount = maxBatchSize * batches
)
var (
sendTimeout = 100 * time.Millisecond
sdUpdatert = sendTimeout / 2
done = make(chan struct{})
)
defer func() {
close(done)
}()
// Set up a faulty Alertmanager.
var faultyCalled atomic.Bool
faultyServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
faultyCalled.Store(true)
select {
case <-done:
case <-time.After(time.Hour):
}
}))
faultyURL, err := url.Parse(faultyServer.URL)
require.NoError(t, err)
// Set up a functional Alertmanager.
var functionalCalled atomic.Bool
functionalServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
functionalCalled.Store(true)
}))
functionalURL, err := url.Parse(functionalServer.URL)
require.NoError(t, err)
// Initialize the discovery manager
// This is relevant as the updates aren't sent continually in real life, but only each updatert.
// The old implementation of TestHangingNotifier didn't take that into account.
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
reg := prometheus.NewRegistry()
sdMetrics, err := discovery.RegisterSDMetrics(reg, discovery.NewRefreshMetrics(reg))
require.NoError(t, err)
sdManager := discovery.NewManager(
ctx,
log.NewNopLogger(),
reg,
sdMetrics,
discovery.Name("sd-manager"),
discovery.Updatert(sdUpdatert),
)
go sdManager.Run()
// Set up the notifier with both faulty and functional Alertmanagers.
notifier := NewManager(
&Options{
QueueCapacity: alertsCount,
},
nil,
)
notifier.alertmanagers = make(map[string]*alertmanagerSet)
amCfg := config.DefaultAlertmanagerConfig
amCfg.Timeout = model.Duration(sendTimeout)
notifier.alertmanagers["config-0"] = &alertmanagerSet{
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return faultyURL.String() },
},
alertmanagerMock{
urlf: func() string { return functionalURL.String() },
},
},
cfg: &amCfg,
metrics: notifier.metrics,
}
go notifier.Run(sdManager.SyncCh())
defer notifier.Stop()
require.Len(t, notifier.Alertmanagers(), 2)
// Enqueue the alerts.
var alerts []*Alert
for i := range make([]struct{}, alertsCount) {
alerts = append(alerts, &Alert{
Labels: labels.FromStrings("alertname", strconv.Itoa(i)),
})
}
notifier.Send(alerts...)
// Wait for the Alertmanagers to start receiving alerts.
// 10*sdUpdatert is used as an arbitrary timeout here.
timeout := time.After(10 * sdUpdatert)
loop1:
for {
select {
case <-timeout:
t.Fatalf("Timeout waiting for the alertmanagers to be reached for the first time.")
default:
if faultyCalled.Load() && functionalCalled.Load() {
break loop1
}
}
}
// Request to remove the faulty Alertmanager.
c := map[string]discovery.Configs{
"config-0": {
discovery.StaticConfig{
&targetgroup.Group{
Targets: []model.LabelSet{
{
model.AddressLabel: model.LabelValue(functionalURL.Host),
},
},
},
},
},
}
require.NoError(t, sdManager.ApplyConfig(c))
// The notifier should not wait until the alerts queue is empty to apply the discovery changes
// A faulty Alertmanager could cause each alert sending cycle to take up to AlertmanagerConfig.Timeout
// The queue may never be emptied, as the arrival rate could be larger than the departure rate
// It could even overflow and alerts could be dropped.
timeout = time.After(batches * sendTimeout)
loop2:
for {
select {
case <-timeout:
t.Fatalf("Timeout, the faulty alertmanager not removed on time.")
default:
// The faulty alertmanager was dropped.
if len(notifier.Alertmanagers()) == 1 {
// Prevent from TOCTOU.
require.Positive(t, notifier.queueLen())
break loop2
}
require.Positive(t, notifier.queueLen(), "The faulty alertmanager wasn't dropped before the alerts queue was emptied.")
}
}
}
func TestStop_DrainingDisabled(t *testing.T) {
releaseReceiver := make(chan struct{})
receiverReceivedRequest := make(chan struct{}, 2)
alertsReceived := atomic.NewInt64(0)
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Let the test know we've received a request.
receiverReceivedRequest <- struct{}{}
var alerts []*Alert
b, err := io.ReadAll(r.Body)
require.NoError(t, err)
err = json.Unmarshal(b, &alerts)
require.NoError(t, err)
alertsReceived.Add(int64(len(alerts)))
// Wait for the test to release us.
<-releaseReceiver
w.WriteHeader(http.StatusOK)
}))
defer func() {
server.Close()
}()
m := NewManager(
&Options{
QueueCapacity: 10,
DrainOnShutdown: false,
},
nil,
)
m.alertmanagers = make(map[string]*alertmanagerSet)
am1Cfg := config.DefaultAlertmanagerConfig
am1Cfg.Timeout = model.Duration(time.Second)
m.alertmanagers["1"] = &alertmanagerSet{
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server.URL },
},
},
cfg: &am1Cfg,
}
notificationManagerStopped := make(chan struct{})
go func() {
defer close(notificationManagerStopped)
m.Run(nil)
}()
// Queue two alerts. The first should be immediately sent to the receiver, which should block until we release it later.
m.Send(&Alert{Labels: labels.FromStrings(labels.AlertName, "alert-1")})
select {
case <-receiverReceivedRequest:
// Nothing more to do.
case <-time.After(time.Second):
require.FailNow(t, "gave up waiting for receiver to receive notification of first alert")
}
m.Send(&Alert{Labels: labels.FromStrings(labels.AlertName, "alert-2")})
// Stop the notification manager, pause to allow the shutdown to be observed, and then allow the receiver to proceed.
m.Stop()
time.Sleep(time.Second)
close(releaseReceiver)
// Wait for the notification manager to stop and confirm only the first notification was sent.
// The second notification should be dropped.
select {
case <-notificationManagerStopped:
// Nothing more to do.
case <-time.After(time.Second):
require.FailNow(t, "gave up waiting for notification manager to stop")
}
require.Equal(t, int64(1), alertsReceived.Load())
}
func TestStop_DrainingEnabled(t *testing.T) {
releaseReceiver := make(chan struct{})
receiverReceivedRequest := make(chan struct{}, 2)
alertsReceived := atomic.NewInt64(0)
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Let the test know we've received a request.
receiverReceivedRequest <- struct{}{}
var alerts []*Alert
b, err := io.ReadAll(r.Body)
require.NoError(t, err)
err = json.Unmarshal(b, &alerts)
require.NoError(t, err)
alertsReceived.Add(int64(len(alerts)))
// Wait for the test to release us.
<-releaseReceiver
w.WriteHeader(http.StatusOK)
}))
defer func() {
server.Close()
}()
m := NewManager(
&Options{
QueueCapacity: 10,
DrainOnShutdown: true,
},
nil,
)
m.alertmanagers = make(map[string]*alertmanagerSet)
am1Cfg := config.DefaultAlertmanagerConfig
am1Cfg.Timeout = model.Duration(time.Second)
m.alertmanagers["1"] = &alertmanagerSet{
ams: []alertmanager{
alertmanagerMock{
urlf: func() string { return server.URL },
},
},
cfg: &am1Cfg,
}
notificationManagerStopped := make(chan struct{})
go func() {
defer close(notificationManagerStopped)
m.Run(nil)
}()
// Queue two alerts. The first should be immediately sent to the receiver, which should block until we release it later.
m.Send(&Alert{Labels: labels.FromStrings(labels.AlertName, "alert-1")})
select {
case <-receiverReceivedRequest:
// Nothing more to do.
case <-time.After(time.Second):
require.FailNow(t, "gave up waiting for receiver to receive notification of first alert")
}
m.Send(&Alert{Labels: labels.FromStrings(labels.AlertName, "alert-2")})
// Stop the notification manager and allow the receiver to proceed.
m.Stop()
close(releaseReceiver)
// Wait for the notification manager to stop and confirm both notifications were sent.
select {
case <-notificationManagerStopped:
// Nothing more to do.
case <-time.After(200 * time.Millisecond):
require.FailNow(t, "gave up waiting for notification manager to stop")
}
require.Equal(t, int64(2), alertsReceived.Load())
}