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Merge pull request #3251 from krasi-georgiev/implement-go-kit-run-groups

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Refactor main.go with  oklog/pkg/group actors pattern
This commit is contained in:
Tobias Schmidt 2017-11-11 17:19:06 +01:00 committed by GitHub
parent 6cd0f63eb1 e2f4850fea
commit 83bb1becab
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
5 changed files with 462 additions and 95 deletions
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274
cmd/prometheus/main.go
View file

@ -31,6 +31,7 @@ import (
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/oklog/oklog/pkg/group"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
@ -216,12 +217,6 @@ func main() {
level.Info(logger).Log("build_context", version.BuildContext())
level.Info(logger).Log("host_details", Uname())
// Make sure that sighup handler is registered with a redirect to the channel before the potentially
// long and synchronous tsdb init.
hup := make(chan os.Signal)
hupReady := make(chan bool)
signal.Notify(hup, syscall.SIGHUP)
var (
localStorage = &tsdb.ReadyStorage{}
remoteStorage = remote.NewStorage(log.With(logger, "component", "remote"), localStorage.StartTime)
@ -282,105 +277,196 @@ func main() {
notifier,
}
// Wait for reload or termination signals. Start the handler for SIGHUP as
// early as possible, but ignore it until we are ready to handle reloading
// our config.
go func() {
<-hupReady
for {
select {
case <-hup:
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
}
case rc := <-webHandler.Reload():
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
rc <- err
} else {
rc <- nil
}
}
}
}()
prometheus.MustRegister(configSuccess)
prometheus.MustRegister(configSuccessTime)
// Start all components while we wait for TSDB to open but only load
// initial config and mark ourselves as ready after it completed.
dbOpen := make(chan struct{})
// Wait until the server is ready to handle reloading
reloadReady := make(chan struct{})
go func() {
defer close(dbOpen)
level.Info(logger).Log("msg", "Starting TSDB")
db, err := tsdb.Open(
cfg.localStoragePath,
log.With(logger, "component", "tsdb"),
prometheus.DefaultRegisterer,
&cfg.tsdb,
var g group.Group
{
term := make(chan os.Signal)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
cancel := make(chan struct{})
g.Add(
func() error {
select {
case <-term:
level.Warn(logger).Log("msg", "Received SIGTERM, exiting gracefully...")
case <-webHandler.Quit():
level.Warn(logger).Log("msg", "Received termination request via web service, exiting gracefully...")
case <-cancel:
break
}
return nil
},
func(err error) {
close(cancel)
},
)
if err != nil {
level.Error(logger).Log("msg", "Opening storage failed", "err", err)
os.Exit(1)
}
level.Info(logger).Log("msg", "TSDB started")
startTimeMargin := int64(2 * time.Duration(cfg.tsdb.MinBlockDuration).Seconds() * 1000)
localStorage.Set(db, startTimeMargin)
}()
prometheus.MustRegister(configSuccess)
prometheus.MustRegister(configSuccessTime)
// The notifier is a dependency of the rule manager. It has to be
// started before and torn down afterwards.
go notifier.Run()
defer notifier.Stop()
go ruleManager.Run()
defer ruleManager.Stop()
go targetManager.Run()
defer targetManager.Stop()
// Shutting down the query engine before the rule manager will cause pending queries
// to be canceled and ensures a quick shutdown of the rule manager.
defer cancelCtx()
errc := make(chan error)
go func() { errc <- webHandler.Run(ctx) }()
<-dbOpen
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error loading config", "err", err)
os.Exit(1)
}
{
// Make sure that sighup handler is registered with a redirect to the channel before the potentially
// long and synchronous tsdb init.
hup := make(chan os.Signal)
signal.Notify(hup, syscall.SIGHUP)
cancel := make(chan struct{})
g.Add(
func() error {
select {
case <-reloadReady:
break
// In case a shutdown is initiated before the reloadReady is released.
case <-cancel:
return nil
}
defer func() {
if err := fanoutStorage.Close(); err != nil {
level.Error(logger).Log("msg", "Error stopping storage", "err", err)
}
}()
for {
select {
case <-hup:
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
}
case rc := <-webHandler.Reload():
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
level.Error(logger).Log("msg", "Error reloading config", "err", err)
rc <- err
} else {
rc <- nil
}
case <-cancel:
return nil
}
}
// Wait for reload or termination signals.
close(hupReady) // Unblock SIGHUP handler.
// Set web server to ready.
webHandler.Ready()
level.Info(logger).Log("msg", "Server is ready to receive requests.")
term := make(chan os.Signal, 1)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
select {
case <-term:
level.Warn(logger).Log("msg", "Received SIGTERM, exiting gracefully...")
case <-webHandler.Quit():
level.Warn(logger).Log("msg", "Received termination request via web service, exiting gracefully...")
case err := <-errc:
level.Error(logger).Log("msg", "Error starting web server, exiting gracefully", "err", err)
},
func(err error) {
close(cancel)
},
)
}
{
cancel := make(chan struct{})
g.Add(
func() error {
select {
case <-dbOpen:
break
// In case a shutdown is initiated before the dbOpen is released
case <-cancel:
return nil
}
if err := reloadConfig(cfg.configFile, logger, reloadables...); err != nil {
return fmt.Errorf("Error loading config %s", err)
}
close(reloadReady)
webHandler.Ready()
level.Info(logger).Log("msg", "Server is ready to receive requests.")
<-cancel
return nil
},
func(err error) {
close(cancel)
},
)
}
{
cancel := make(chan struct{})
g.Add(
func() error {
level.Info(logger).Log("msg", "Starting TSDB ...")
db, err := tsdb.Open(
cfg.localStoragePath,
log.With(logger, "component", "tsdb"),
prometheus.DefaultRegisterer,
&cfg.tsdb,
)
if err != nil {
return fmt.Errorf("Opening storage failed %s", err)
}
level.Info(logger).Log("msg", "TSDB started")
startTimeMargin := int64(2 * time.Duration(cfg.tsdb.MinBlockDuration).Seconds() * 1000)
localStorage.Set(db, startTimeMargin)
close(dbOpen)
<-cancel
return nil
},
func(err error) {
if err := fanoutStorage.Close(); err != nil {
level.Error(logger).Log("msg", "Error stopping storage", "err", err)
}
close(cancel)
},
)
}
{
g.Add(
func() error {
if err := webHandler.Run(ctx); err != nil {
return fmt.Errorf("Error starting web server: %s", err)
}
return nil
},
func(err error) {
// Keep this interrupt before the ruleManager.Stop().
// Shutting down the query engine before the rule manager will cause pending queries
// to be canceled and ensures a quick shutdown of the rule manager.
cancelCtx()
},
)
}
{
// TODO(krasi) refactor ruleManager.Run() to be blocking to avoid using an extra blocking channel.
cancel := make(chan struct{})
g.Add(
func() error {
ruleManager.Run()
<-cancel
return nil
},
func(err error) {
ruleManager.Stop()
close(cancel)
},
)
}
{
// Calling notifier.Stop() before ruleManager.Stop() will cause a panic if the ruleManager isn't running,
// so keep this interrupt after the ruleManager.Stop().
g.Add(
func() error {
notifier.Run()
return nil
},
func(err error) {
notifier.Stop()
},
)
}
{
// TODO(krasi) refactor targetManager.Run() to be blocking to avoid using an extra blocking channel.
cancel := make(chan struct{})
g.Add(
func() error {
targetManager.Run()
<-cancel
return nil
},
func(err error) {
targetManager.Stop()
close(cancel)
},
)
}
if err := g.Run(); err != nil {
level.Error(logger).Log("err", err)
}
level.Info(logger).Log("msg", "See you next time!")
}

201
vendor/github.com/oklog/oklog/LICENSE generated vendored Normal file
View file

@ -0,0 +1,201 @@
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62
vendor/github.com/oklog/oklog/pkg/group/group.go generated vendored Normal file
View file

@ -0,0 +1,62 @@
// Package group implements an actor-runner with deterministic teardown. It is
// somewhat similar to package errgroup, except it does not require actor
// goroutines to understand context semantics. This makes it suitable for use
// in more circumstances; for example, goroutines which are handling
// connections from net.Listeners, or scanning input from a closable io.Reader.
package group
// Group collects actors (functions) and runs them concurrently.
// When one actor (function) returns, all actors are interrupted.
// The zero value of a Group is useful.
type Group struct {
actors []actor
}
// Add an actor (function) to the group. Each actor must be pre-emptable by an
// interrupt function. That is, if interrupt is invoked, execute should return.
// Also, it must be safe to call interrupt even after execute has returned.
//
// The first actor (function) to return interrupts all running actors.
// The error is passed to the interrupt functions, and is returned by Run.
func (g *Group) Add(execute func() error, interrupt func(error)) {
g.actors = append(g.actors, actor{execute, interrupt})
}
// Run all actors (functions) concurrently.
// When the first actor returns, all others are interrupted.
// Run only returns when all actors have exited.
// Run returns the error returned by the first exiting actor.
func (g *Group) Run() error {
if len(g.actors) == 0 {
return nil
}
// Run each actor.
errors := make(chan error, len(g.actors))
for _, a := range g.actors {
go func(a actor) {
errors <- a.execute()
}(a)
}
// Wait for the first actor to stop.
err := <-errors
// Signal all actors to stop.
for _, a := range g.actors {
a.interrupt(err)
}
// Wait for all actors to stop.
for i := 1; i < cap(errors); i++ {
<-errors
}
// Return the original error.
return err
}
type actor struct {
execute func() error
interrupt func(error)
}

6
vendor/vendor.json vendored
View file

@ -665,6 +665,12 @@
"revision": "1d49c987357a327b5b03aa84cbddd582c328615d",
"revisionTime": "2016-09-28T00:14:32Z"
},
{
"checksumSHA1": "gkyBg/2hcIWR/8qGEeGVoHwOyfo=",
"path": "github.com/oklog/oklog/pkg/group",
"revision": "f857583a70c345341d679b3f27aa542c8db70a21",
"revisionTime": "2017-09-18T07:00:58Z"
},
{
"checksumSHA1": "B1iGaUz7NrjEmCjVdIgH5pvkTe8=",
"path": "github.com/oklog/ulid",

14
web/web.go
View file

@ -460,7 +460,19 @@ func (h *Handler) Run(ctx context.Context) error {
}
}()
return m.Serve()
errCh := make(chan error)
go func() {
errCh <- m.Serve()
}()
select {
case e := <-errCh:
return e
case <-ctx.Done():
httpSrv.Shutdown(ctx)
grpcSrv.GracefulStop()
return nil
}
}
func (h *Handler) alerts(w http.ResponseWriter, r *http.Request) {