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main.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 main
import (
"crypto/md5"
"encoding/binary"
"flag"
"fmt"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"path/filepath"
"sort"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/prometheus/alertmanager/api"
"github.com/prometheus/alertmanager/config"
"github.com/prometheus/alertmanager/dispatch"
"github.com/prometheus/alertmanager/inhibit"
"github.com/prometheus/alertmanager/nflog"
"github.com/prometheus/alertmanager/notify"
"github.com/prometheus/alertmanager/provider/mem"
"github.com/prometheus/alertmanager/silence"
"github.com/prometheus/alertmanager/template"
"github.com/prometheus/alertmanager/types"
"github.com/prometheus/alertmanager/ui"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/route"
"github.com/prometheus/common/version"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/weaveworks/mesh"
)
var (
configHash = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "alertmanager_config_hash",
Help: "Hash of the currently loaded alertmanager configuration.",
})
configSuccess = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "alertmanager_config_last_reload_successful",
Help: "Whether the last configuration reload attempt was successful.",
})
configSuccessTime = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "alertmanager_config_last_reload_success_timestamp_seconds",
Help: "Timestamp of the last successful configuration reload.",
})
)
func init() {
prometheus.MustRegister(configSuccess)
prometheus.MustRegister(configSuccessTime)
prometheus.MustRegister(configHash)
prometheus.MustRegister(version.NewCollector("alertmanager"))
}
func main() {
peers := &stringset{}
var (
showVersion = flag.Bool("version", false, "Print version information.")
configFile = flag.String("config.file", "alertmanager.yml", "Alertmanager configuration file name.")
dataDir = flag.String("storage.path", "data/", "Base path for data storage.")
retention = flag.Duration("data.retention", 5*24*time.Hour, "How long to keep data for.")
externalURL = flag.String("web.external-url", "", "The URL under which Alertmanager is externally reachable (for example, if Alertmanager is served via a reverse proxy). Used for generating relative and absolute links back to Alertmanager itself. If the URL has a path portion, it will be used to prefix all HTTP endpoints served by Alertmanager. If omitted, relevant URL components will be derived automatically.")
routePrefix = flag.String("web.route-prefix", "", "Prefix for the internal routes of web endpoints. Defaults to path of -web.external-url.")
listenAddress = flag.String("web.listen-address", ":9093", "Address to listen on for the web interface and API.")
meshListen = flag.String("mesh.listen-address", net.JoinHostPort("0.0.0.0", strconv.Itoa(mesh.Port)), "mesh listen address. Pass an empty string to disable.")
hwaddr = flag.String("mesh.peer-id", "", "mesh peer ID (default: MAC address)")
nickname = flag.String("mesh.nickname", mustHostname(), "mesh peer nickname")
password = flag.String("mesh.password", "", "password to join the peer network (empty password disables encryption)")
)
flag.Var(peers, "mesh.peer", "initial peers (may be repeated)")
flag.Parse()
if *hwaddr == "" {
*hwaddr = mustHardwareAddr()
}
if len(flag.Args()) > 0 {
log.Fatalln("Received unexpected and unparsed arguments: ", strings.Join(flag.Args(), ", "))
}
if *showVersion {
fmt.Fprintln(os.Stdout, version.Print("alertmanager"))
os.Exit(0)
}
log.Infoln("Starting alertmanager", version.Info())
log.Infoln("Build context", version.BuildContext())
err := os.MkdirAll(*dataDir, 0777)
if err != nil {
log.Fatal(err)
}
var mrouter *mesh.Router
if *meshListen != "" {
mrouter, err = initMesh(*meshListen, *hwaddr, *nickname, *password, log.With("component", "mesh"))
if err != nil {
log.Fatal(err)
}
}
stopc := make(chan struct{})
var wg sync.WaitGroup
wg.Add(1)
notificationLogOpts := []nflog.Option{
nflog.WithRetention(*retention),
nflog.WithSnapshot(filepath.Join(*dataDir, "nflog")),
nflog.WithMaintenance(15*time.Minute, stopc, wg.Done),
nflog.WithMetrics(prometheus.DefaultRegisterer),
nflog.WithLogger(log.Base().With("component", "nflog")),
}
if *meshListen != "" {
notificationLogOpts = append(notificationLogOpts, nflog.WithMesh(func(g mesh.Gossiper) mesh.Gossip {
res, err := mrouter.NewGossip("nflog", g)
if err != nil {
log.Fatal(err)
}
return res
}))
}
notificationLog, err := nflog.New(notificationLogOpts...)
if err != nil {
log.Fatal(err)
}
marker := types.NewMarker()
silenceOpts := silence.Options{
SnapshotFile: filepath.Join(*dataDir, "silences"),
Retention: *retention,
Logger: log.Base().With("component", "silences"),
Metrics: prometheus.DefaultRegisterer,
}
if *meshListen != "" {
silenceOpts.Gossip = func(g mesh.Gossiper) mesh.Gossip {
res, err := mrouter.NewGossip("silences", g)
if err != nil {
log.Fatal(err)
}
return res
}
}
silences, err := silence.New(silenceOpts)
if err != nil {
log.Fatal(err)
}
// Start providers before router potentially sends updates.
wg.Add(1)
go func() {
silences.Maintenance(15*time.Minute, filepath.Join(*dataDir, "silences"), stopc)
wg.Done()
}()
// Disable mesh if empty string passed for mesh.listen-address flag.
if *meshListen != "" {
mrouter.Start()
mrouter.ConnectionMaker.InitiateConnections(peers.slice(), true)
}
defer func() {
close(stopc)
// Stop receiving updates from router before shutting down.
mrouter.Stop()
wg.Wait()
}()
alerts, err := mem.NewAlerts(marker, 30*time.Minute, *dataDir)
if err != nil {
log.Fatal(err)
}
defer alerts.Close()
var (
inhibitor *inhibit.Inhibitor
tmpl *template.Template
pipeline notify.Stage
disp *dispatch.Dispatcher
)
defer disp.Stop()
apiv := api.New(
alerts,
silences,
func(matchers []*labels.Matcher) dispatch.AlertOverview {
return disp.Groups(matchers)
},
marker.Status,
mrouter,
)
amURL, err := extURL(*listenAddress, *externalURL)
if err != nil {
log.Fatal(err)
}
waitFunc := func() time.Duration { return 0 }
if *meshListen != "" {
waitFunc = meshWait(mrouter, 5*time.Second)
}
timeoutFunc := func(d time.Duration) time.Duration {
if d < notify.MinTimeout {
d = notify.MinTimeout
}
return d + waitFunc()
}
var hash float64
reload := func() (err error) {
log.With("file", *configFile).Infof("Loading configuration file")
defer func() {
if err != nil {
log.With("file", *configFile).Errorf("Loading configuration file failed: %s", err)
configSuccess.Set(0)
} else {
configSuccess.Set(1)
configSuccessTime.Set(float64(time.Now().Unix()))
configHash.Set(hash)
}
}()
conf, plainCfg, err := config.LoadFile(*configFile)
if err != nil {
return err
}
hash = md5HashAsMetricValue(plainCfg)
err = apiv.Update(conf, time.Duration(conf.Global.ResolveTimeout))
if err != nil {
return err
}
tmpl, err = template.FromGlobs(conf.Templates...)
if err != nil {
return err
}
tmpl.ExternalURL = amURL
inhibitor.Stop()
disp.Stop()
inhibitor = inhibit.NewInhibitor(alerts, conf.InhibitRules, marker)
pipeline = notify.BuildPipeline(
conf.Receivers,
tmpl,
waitFunc,
inhibitor,
silences,
notificationLog,
marker,
)
disp = dispatch.NewDispatcher(alerts, dispatch.NewRoute(conf.Route, nil), pipeline, marker, timeoutFunc)
go disp.Run()
go inhibitor.Run()
return nil
}
if err := reload(); err != nil {
os.Exit(1)
}
// Make routePrefix default to externalURL path if empty string.
if routePrefix == nil || *routePrefix == "" {
*routePrefix = amURL.Path
}
*routePrefix = "/" + strings.Trim(*routePrefix, "/")
router := route.New()
if *routePrefix != "/" {
router = router.WithPrefix(*routePrefix)
}
webReload := make(chan struct{})
ui.Register(router, webReload)
apiv.Register(router.WithPrefix("/api"))
log.Infoln("Listening on", *listenAddress)
go listen(*listenAddress, router)
var (
hup = make(chan os.Signal)
hupReady = make(chan bool)
term = make(chan os.Signal)
)
signal.Notify(hup, syscall.SIGHUP)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
go func() {
<-hupReady
for {
select {
case <-hup:
case <-webReload:
}
reload()
}
}()
// Wait for reload or termination signals.
close(hupReady) // Unblock SIGHUP handler.
<-term
log.Infoln("Received SIGTERM, exiting gracefully...")
}
type peerDescSlice []mesh.PeerDescription
func (s peerDescSlice) Len() int { return len(s) }
func (s peerDescSlice) Less(i, j int) bool { return s[i].UID < s[j].UID }
func (s peerDescSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
// meshWait returns a function that inspects the current peer state and returns
// a duration of one base timeout for each peer with a higher ID than ourselves.
func meshWait(r *mesh.Router, timeout time.Duration) func() time.Duration {
return func() time.Duration {
var peers peerDescSlice
for _, desc := range r.Peers.Descriptions() {
peers = append(peers, desc)
}
sort.Sort(peers)
k := 0
for _, desc := range peers {
if desc.Self {
break
}
k++
}
// TODO(fabxc): add metric exposing the "position" from AM's own view.
return time.Duration(k) * timeout
}
}
func initMesh(addr, hwaddr, nickname, pw string, logger log.Logger) (*mesh.Router, error) {
host, portStr, err := net.SplitHostPort(addr)
if err != nil {
log.Fatalf("mesh address: %s: %v", addr, err)
}
port, err := strconv.Atoi(portStr)
if err != nil {
log.Fatalf("mesh address: %s: %v", addr, err)
}
name, err := mesh.PeerNameFromString(hwaddr)
if err != nil {
log.Fatalf("invalid hardware address %q: %v", hwaddr, err)
}
password := []byte(pw)
if len(password) == 0 {
// Emtpy password is used to disable secure communication. Using a nil
// password disables encryption in mesh.
password = nil
}
return mesh.NewRouter(mesh.Config{
Host: host,
Port: port,
ProtocolMinVersion: mesh.ProtocolMinVersion,
Password: password,
ConnLimit: 64,
PeerDiscovery: true,
TrustedSubnets: []*net.IPNet{},
}, name, nickname, mesh.NullOverlay{}, printfLogger{logger})
}
type printfLogger struct {
log.Logger
}
func (l printfLogger) Printf(f string, args ...interface{}) {
l.Debugf(f, args...)
}
func extURL(listen, external string) (*url.URL, error) {
if external == "" {
hostname, err := os.Hostname()
if err != nil {
return nil, err
}
_, port, err := net.SplitHostPort(listen)
if err != nil {
return nil, err
}
external = fmt.Sprintf("http://%s:%s/", hostname, port)
}
u, err := url.Parse(external)
if err != nil {
return nil, err
}
ppref := strings.TrimRight(u.Path, "/")
if ppref != "" && !strings.HasPrefix(ppref, "/") {
ppref = "/" + ppref
}
u.Path = ppref
return u, nil
}
func listen(listen string, router *route.Router) {
if err := http.ListenAndServe(listen, router); err != nil {
log.Fatal(err)
}
}
type stringset map[string]struct{}
func (ss stringset) Set(value string) error {
for _, v := range strings.Split(value, ",") {
if v = strings.TrimSpace(v); v != "" {
ss[v] = struct{}{}
}
}
return nil
}
func (ss stringset) String() string {
return strings.Join(ss.slice(), ",")
}
func (ss stringset) slice() []string {
slice := make([]string, 0, len(ss))
for k := range ss {
slice = append(slice, k)
}
sort.Strings(slice)
return slice
}
func mustHardwareAddr() string {
// TODO(fabxc): consider a safe-guard against colliding MAC addresses.
ifaces, err := net.Interfaces()
if err != nil {
panic(err)
}
for _, iface := range ifaces {
if s := iface.HardwareAddr.String(); s != "" {
return s
}
}
panic("no valid network interfaces")
}
func mustHostname() string {
hostname, err := os.Hostname()
if err != nil {
panic(err)
}
return hostname
}
func md5HashAsMetricValue(data []byte) float64 {
sum := md5.Sum(data)
// We only want 48 bits as a float64 only has a 53 bit mantissa.
smallSum := sum[0:6]
var bytes = make([]byte, 8)
copy(bytes, smallSum)
return float64(binary.LittleEndian.Uint64(bytes))
}