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acceptance.go
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acceptance.go
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// Copyright 2015 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 test
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"sync"
"syscall"
"testing"
"time"
"github.com/prometheus/client_golang/api"
"github.com/prometheus/common/model"
"golang.org/x/net/context"
"github.com/prometheus/alertmanager/client"
)
// AcceptanceTest provides declarative definition of given inputs and expected
// output of an Alertmanager setup.
type AcceptanceTest struct {
*testing.T
opts *AcceptanceOpts
ams []*Alertmanager
collectors []*Collector
actions map[float64][]func()
}
// AcceptanceOpts defines configuration paramters for an acceptance test.
type AcceptanceOpts struct {
Tolerance time.Duration
baseTime time.Time
}
func (opts *AcceptanceOpts) alertString(a *model.Alert) string {
if a.EndsAt.IsZero() {
return fmt.Sprintf("%s[%v:]", a, opts.relativeTime(a.StartsAt))
}
return fmt.Sprintf("%s[%v:%v]", a, opts.relativeTime(a.StartsAt), opts.relativeTime(a.EndsAt))
}
// expandTime returns the absolute time for the relative time
// calculated from the test's base time.
func (opts *AcceptanceOpts) expandTime(rel float64) time.Time {
return opts.baseTime.Add(time.Duration(rel * float64(time.Second)))
}
// expandTime returns the relative time for the given time
// calculated from the test's base time.
func (opts *AcceptanceOpts) relativeTime(act time.Time) float64 {
return float64(act.Sub(opts.baseTime)) / float64(time.Second)
}
// NewAcceptanceTest returns a new acceptance test with the base time
// set to the current time.
func NewAcceptanceTest(t *testing.T, opts *AcceptanceOpts) *AcceptanceTest {
test := &AcceptanceTest{
T: t,
opts: opts,
actions: map[float64][]func(){},
}
opts.baseTime = time.Now()
return test
}
// freeAddress returns a new listen address not currently in use.
func freeAddress() string {
// Let the OS allocate a free address, close it and hope
// it is still free when starting Alertmanager.
l, err := net.Listen("tcp4", "localhost:0")
if err != nil {
panic(err)
}
defer l.Close()
return l.Addr().String()
}
// Do sets the given function to be executed at the given time.
func (t *AcceptanceTest) Do(at float64, f func()) {
t.actions[at] = append(t.actions[at], f)
}
// Alertmanager returns a new structure that allows starting an instance
// of Alertmanager on a random port.
func (t *AcceptanceTest) Alertmanager(conf string) *Alertmanager {
am := &Alertmanager{
t: t,
opts: t.opts,
}
dir, err := ioutil.TempDir("", "am_test")
if err != nil {
t.Fatal(err)
}
am.dir = dir
cf, err := os.Create(filepath.Join(dir, "config.yml"))
if err != nil {
t.Fatal(err)
}
am.confFile = cf
am.UpdateConfig(conf)
am.apiAddr = freeAddress()
am.clusterAddr = freeAddress()
t.Logf("AM on %s", am.apiAddr)
c, err := api.NewClient(api.Config{
Address: fmt.Sprintf("http://%s", am.apiAddr),
})
if err != nil {
t.Fatal(err)
}
am.client = c
t.ams = append(t.ams, am)
return am
}
// Collector returns a new collector bound to the test instance.
func (t *AcceptanceTest) Collector(name string) *Collector {
co := &Collector{
t: t.T,
name: name,
opts: t.opts,
collected: map[float64][]model.Alerts{},
expected: map[Interval][]model.Alerts{},
}
t.collectors = append(t.collectors, co)
return co
}
// Run starts all Alertmanagers and runs queries against them. It then checks
// whether all expected notifications have arrived at the expected receiver.
func (t *AcceptanceTest) Run() {
errc := make(chan error)
for _, am := range t.ams {
am.errc = errc
am.Start()
defer func(am *Alertmanager) {
am.Terminate()
am.cleanup()
t.Logf("stdout:\n%v", am.cmd.Stdout)
t.Logf("stderr:\n%v", am.cmd.Stderr)
}(am)
}
go t.runActions()
var latest float64
for _, coll := range t.collectors {
if l := coll.latest(); l > latest {
latest = l
}
}
deadline := t.opts.expandTime(latest)
select {
case <-time.After(deadline.Sub(time.Now())):
// continue
case err := <-errc:
t.Error(err)
}
for _, coll := range t.collectors {
report := coll.check()
t.Log(report)
}
}
// runActions performs the stored actions at the defined times.
func (t *AcceptanceTest) runActions() {
var wg sync.WaitGroup
for at, fs := range t.actions {
ts := t.opts.expandTime(at)
wg.Add(len(fs))
for _, f := range fs {
go func(f func()) {
time.Sleep(ts.Sub(time.Now()))
f()
wg.Done()
}(f)
}
}
wg.Wait()
}
type buffer struct {
b bytes.Buffer
mtx sync.Mutex
}
func (b *buffer) Write(p []byte) (int, error) {
b.mtx.Lock()
defer b.mtx.Unlock()
return b.b.Write(p)
}
func (b *buffer) String() string {
b.mtx.Lock()
defer b.mtx.Unlock()
return b.b.String()
}
// Alertmanager encapsulates an Alertmanager process and allows
// declaring alerts being pushed to it at fixed points in time.
type Alertmanager struct {
t *AcceptanceTest
opts *AcceptanceOpts
apiAddr string
clusterAddr string
client api.Client
cmd *exec.Cmd
confFile *os.File
dir string
errc chan<- error
}
// Start the alertmanager and wait until it is ready to receive.
func (am *Alertmanager) Start() {
cmd := exec.Command("../../alertmanager",
"--config.file", am.confFile.Name(),
"--log.level", "debug",
"--web.listen-address", am.apiAddr,
"--storage.path", am.dir,
"--cluster.listen-address", am.clusterAddr,
"--cluster.settle-timeout", "0s",
)
if am.cmd == nil {
var outb, errb buffer
cmd.Stdout = &outb
cmd.Stderr = &errb
} else {
cmd.Stdout = am.cmd.Stdout
cmd.Stderr = am.cmd.Stderr
}
am.cmd = cmd
if err := am.cmd.Start(); err != nil {
am.t.Fatalf("Starting alertmanager failed: %s", err)
}
go func() {
if err := am.cmd.Wait(); err != nil {
am.errc <- err
}
}()
time.Sleep(50 * time.Millisecond)
for i := 0; i < 10; i++ {
resp, err := http.Get(fmt.Sprintf("http://%s/status", am.apiAddr))
if err == nil {
_, err := ioutil.ReadAll(resp.Body)
if err != nil {
am.t.Fatalf("Starting alertmanager failed: %s", err)
}
resp.Body.Close()
return
}
time.Sleep(500 * time.Millisecond)
}
am.t.Fatalf("Starting alertmanager failed: timeout")
}
// Terminate kills the underlying Alertmanager process and remove intermediate
// data.
func (am *Alertmanager) Terminate() {
if err := syscall.Kill(am.cmd.Process.Pid, syscall.SIGTERM); err != nil {
am.t.Fatalf("Error sending SIGTERM to Alertmanager process: %v", err)
}
}
// Reload sends the reloading signal to the Alertmanager process.
func (am *Alertmanager) Reload() {
if err := syscall.Kill(am.cmd.Process.Pid, syscall.SIGHUP); err != nil {
am.t.Fatalf("Error sending SIGHUP to Alertmanager process: %v", err)
}
}
func (am *Alertmanager) cleanup() {
if err := os.RemoveAll(am.confFile.Name()); err != nil {
am.t.Errorf("Error removing test config file %q: %v", am.confFile.Name(), err)
}
}
// Push declares alerts that are to be pushed to the Alertmanager
// server at a relative point in time.
func (am *Alertmanager) Push(at float64, alerts ...*TestAlert) {
var cas []client.Alert
for i := range alerts {
a := alerts[i].nativeAlert(am.opts)
al := client.Alert{
Labels: client.LabelSet{},
Annotations: client.LabelSet{},
StartsAt: a.StartsAt,
EndsAt: a.EndsAt,
GeneratorURL: a.GeneratorURL,
}
for n, v := range a.Labels {
al.Labels[client.LabelName(n)] = client.LabelValue(v)
}
for n, v := range a.Annotations {
al.Annotations[client.LabelName(n)] = client.LabelValue(v)
}
cas = append(cas, al)
}
alertAPI := client.NewAlertAPI(am.client)
am.t.Do(at, func() {
if err := alertAPI.Push(context.Background(), cas...); err != nil {
am.t.Errorf("Error pushing %v: %s", cas, err)
}
})
}
// SetSilence updates or creates the given Silence.
func (am *Alertmanager) SetSilence(at float64, sil *TestSilence) {
am.t.Do(at, func() {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(sil.nativeSilence(am.opts)); err != nil {
am.t.Errorf("Error setting silence %v: %s", sil, err)
return
}
resp, err := http.Post(fmt.Sprintf("http://%s/api/v1/silences", am.apiAddr), "application/json", &buf)
if err != nil {
am.t.Errorf("Error setting silence %v: %s", sil, err)
return
}
defer resp.Body.Close()
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
var v struct {
Status string `json:"status"`
Data struct {
SilenceID string `json:"silenceId"`
} `json:"data"`
}
if err := json.Unmarshal(b, &v); err != nil || resp.StatusCode/100 != 2 {
am.t.Errorf("error setting silence %v: %s", sil, err)
return
}
sil.SetID(v.Data.SilenceID)
})
}
// DelSilence deletes the silence with the sid at the given time.
func (am *Alertmanager) DelSilence(at float64, sil *TestSilence) {
am.t.Do(at, func() {
req, err := http.NewRequest("DELETE", fmt.Sprintf("http://%s/api/v1/silence/%s", am.apiAddr, sil.ID()), nil)
if err != nil {
am.t.Errorf("Error deleting silence %v: %s", sil, err)
return
}
resp, err := http.DefaultClient.Do(req)
if err != nil || resp.StatusCode/100 != 2 {
am.t.Errorf("Error deleting silence %v: %s", sil, err)
return
}
})
}
// UpdateConfig rewrites the configuration file for the Alertmanager. It does not
// initiate config reloading.
func (am *Alertmanager) UpdateConfig(conf string) {
if _, err := am.confFile.WriteString(conf); err != nil {
am.t.Fatal(err)
return
}
if err := am.confFile.Sync(); err != nil {
am.t.Fatal(err)
return
}
}