/
atc.go
179 lines (150 loc) · 5.1 KB
/
atc.go
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package atc
import (
"context"
"fmt"
"net/http"
"strings"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/dskit/flagext"
"github.com/grafana/dskit/modules"
"github.com/grafana/dskit/server"
"github.com/grafana/dskit/services"
"github.com/grafana/dskit/signals"
"github.com/pkg/errors"
"go.uber.org/atomic"
"github.com/attachmentgenie/atc/pkg/atc/autoscaler"
"github.com/attachmentgenie/atc/pkg/atc/deployer"
"github.com/attachmentgenie/atc/pkg/atc/event_sink"
"github.com/attachmentgenie/atc/pkg/atc/forwarder"
"github.com/attachmentgenie/atc/pkg/atc/radar"
"github.com/attachmentgenie/atc/pkg/atc/redirecter"
)
type Config struct {
Name string `yaml:"service"`
Server server.Config `yaml:"server"`
Target flagext.StringSliceCSV `yaml:"target"`
}
type Atc struct {
Cfg Config
logger log.Logger
Server *server.Server
Autoscaler *autoscaler.Autoscaler
Deployer *deployer.Deployer
EventSink *event_sink.EventSink
Forwarder *forwarder.Forwarder
Radar *radar.Radar
Redirecter *redirecter.Redirecter
// set during initialization
ServiceMap map[string]services.Service
ModuleManager *modules.Manager
}
func New(cfg Config) (*Atc, error) {
logger := initLogger(cfg.Server.LogFormat, cfg.Server.LogLevel)
cfg.Server.Log = logger
atc := &Atc{
Cfg: cfg,
logger: logger,
}
if err := atc.setupModuleManager(); err != nil {
return nil, err
}
return atc, nil
}
func (t *Atc) Run() error {
for _, module := range t.Cfg.Target {
if !t.ModuleManager.IsTargetableModule(module) {
return fmt.Errorf("selected target (%s) is an internal module, which is not allowed", module)
}
}
var err error
t.ServiceMap, err = t.ModuleManager.InitModuleServices(t.Cfg.Target...)
if err != nil {
return err
}
// get all services, create service manager and tell it to start
servs := []services.Service(nil)
for _, s := range t.ServiceMap {
servs = append(servs, s)
}
sm, err := services.NewManager(servs...)
if err != nil {
return err
}
// Used to delay shutdown but return "not ready" during this delay.
shutdownRequested := atomic.NewBool(false)
t.Server.HTTP.Path("/ready").Handler(t.readyHandler(sm, shutdownRequested))
t.Server.HTTP.Path("/health").Handler(t.readyHandler(sm, shutdownRequested))
// Let's listen for events from this manager, and log them.
healthy := func() { level.Info(t.logger).Log("msg", "Application started") }
stopped := func() { level.Info(t.logger).Log("msg", "Application stopped") }
serviceFailed := func(service services.Service) {
// if any service fails, stop entire Mimir
sm.StopAsync()
// let's find out which module failed
for m, s := range t.ServiceMap {
if s == service {
if errors.Is(service.FailureCase(), modules.ErrStopProcess) {
level.Info(t.logger).Log("msg", "received stop signal via return error", "module", m, "err", service.FailureCase())
} else {
level.Error(t.logger).Log("msg", "module failed", "module", m, "err", service.FailureCase())
}
return
}
}
level.Error(t.logger).Log("msg", "module failed", "module", "unknown", "err", service.FailureCase())
}
sm.AddListener(services.NewManagerListener(healthy, stopped, serviceFailed))
handler := signals.NewHandler(t.logger)
go func() {
handler.Loop()
shutdownRequested.Store(true)
t.Server.HTTPServer.SetKeepAlivesEnabled(false)
sm.StopAsync()
}()
// Start all services. This can really only fail if some service is already
// in other state than New, which should not be the case.
err = sm.StartAsync(context.Background())
if err == nil {
// Wait until service manager stops. It can stop in two ways:
// 1) Signal is received and manager is stopped.
// 2) Any service fails.
err = sm.AwaitStopped(context.Background())
}
// If there is no error yet (= service manager started and then stopped without problems),
// but any service failed, report that failure as an error to caller.
if err == nil {
if failed := sm.ServicesByState()[services.Failed]; len(failed) > 0 {
for _, f := range failed {
if !errors.Is(f.FailureCase(), modules.ErrStopProcess) {
// Details were reported via failure listener before
err = errors.New("failed services")
break
}
}
}
}
return err
}
func (t *Atc) readyHandler(sm *services.Manager, shutdownRequested *atomic.Bool) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if shutdownRequested.Load() {
level.Debug(t.logger).Log("msg", "application is stopping")
http.Error(w, "Application is stopping", http.StatusServiceUnavailable)
return
}
if !sm.IsHealthy() {
var serviceNamesStates []string
for name, s := range t.ServiceMap {
if s.State() != services.Running {
serviceNamesStates = append(serviceNamesStates, fmt.Sprintf("%s: %s", name, s.State()))
}
}
level.Debug(t.logger).Log("msg", "some services are not Running", "services", strings.Join(serviceNamesStates, ", "))
httpResponse := "Some services are not Running:\n" + strings.Join(serviceNamesStates, "\n")
http.Error(w, httpResponse, http.StatusServiceUnavailable)
return
}
fmt.Fprintf(w, "OK")
}
}