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server.go
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server.go
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package server
import (
"encoding/json"
"errors"
"net/http"
"time"
"github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/go-systemd/activation"
"github.com/coreos/fleet/agent"
"github.com/coreos/fleet/api"
"github.com/coreos/fleet/config"
"github.com/coreos/fleet/engine"
"github.com/coreos/fleet/etcd"
"github.com/coreos/fleet/heart"
"github.com/coreos/fleet/log"
"github.com/coreos/fleet/machine"
"github.com/coreos/fleet/pkg"
"github.com/coreos/fleet/registry"
"github.com/coreos/fleet/systemd"
"github.com/coreos/fleet/unit"
"github.com/coreos/fleet/version"
)
const (
// machineStateRefreshInterval is the amount of time the server will
// wait before each attempt to refresh the local machine state
machineStateRefreshInterval = time.Minute
)
type Server struct {
agent *agent.Agent
aReconciler *agent.AgentReconciler
usPub *agent.UnitStatePublisher
usGen *unit.UnitStateGenerator
engine *engine.Engine
mach *machine.CoreOSMachine
hrt heart.Heart
mon *heart.Monitor
api *api.Server
engineReconcileInterval time.Duration
stop chan bool
}
func New(cfg config.Config) (*Server, error) {
etcdRequestTimeout := time.Duration(cfg.EtcdRequestTimeout*1000) * time.Millisecond
agentTTL, err := time.ParseDuration(cfg.AgentTTL)
if err != nil {
return nil, err
}
mgr, err := systemd.NewSystemdUnitManager(systemd.DefaultUnitsDirectory)
if err != nil {
return nil, err
}
mach, err := newMachineFromConfig(cfg, mgr)
if err != nil {
return nil, err
}
tlsConfig, err := etcd.ReadTLSConfigFiles(cfg.EtcdCAFile, cfg.EtcdCertFile, cfg.EtcdKeyFile)
if err != nil {
return nil, err
}
eTrans := &http.Transport{TLSClientConfig: tlsConfig}
eClient, err := etcd.NewClient(cfg.EtcdServers, eTrans, etcdRequestTimeout)
if err != nil {
return nil, err
}
reg := registry.NewEtcdRegistry(eClient, cfg.EtcdKeyPrefix)
pub := agent.NewUnitStatePublisher(reg, mach, agentTTL)
gen := unit.NewUnitStateGenerator(mgr)
a := agent.New(mgr, gen, reg, mach, agentTTL)
rStream := registry.NewEtcdEventStream(eClient, cfg.EtcdKeyPrefix)
ar := agent.NewReconciler(reg, rStream)
e := engine.New(reg, rStream, mach)
listeners, err := activation.Listeners(false)
if err != nil {
return nil, err
}
hrt := heart.New(reg, mach)
mon := heart.NewMonitor(agentTTL)
apiServer := api.NewServer(listeners, api.NewServeMux(reg))
apiServer.Serve()
eIval := time.Duration(cfg.EngineReconcileInterval*1000) * time.Millisecond
srv := Server{
agent: a,
aReconciler: ar,
usGen: gen,
usPub: pub,
engine: e,
mach: mach,
hrt: hrt,
mon: mon,
api: apiServer,
stop: nil,
engineReconcileInterval: eIval,
}
return &srv, nil
}
func newMachineFromConfig(cfg config.Config, mgr unit.UnitManager) (*machine.CoreOSMachine, error) {
state := machine.MachineState{
PublicIP: cfg.PublicIP,
Metadata: cfg.Metadata(),
Version: version.Version,
}
mach := machine.NewCoreOSMachine(state, mgr)
mach.Refresh()
if mach.State().ID == "" {
return nil, errors.New("unable to determine local machine ID")
}
return mach, nil
}
func (s *Server) Run() {
log.Infof("Establishing etcd connectivity")
var err error
for sleep := time.Second; ; sleep = pkg.ExpBackoff(sleep, time.Minute) {
_, err = s.hrt.Beat(s.mon.TTL)
if err == nil {
break
}
time.Sleep(sleep)
}
log.Infof("Starting server components")
s.stop = make(chan bool)
go s.Monitor()
go s.api.Available(s.stop)
go s.mach.PeriodicRefresh(machineStateRefreshInterval, s.stop)
go s.agent.Heartbeat(s.stop)
go s.aReconciler.Run(s.agent, s.stop)
go s.engine.Run(s.engineReconcileInterval, s.stop)
beatchan := make(chan *unit.UnitStateHeartbeat)
go s.usGen.Run(beatchan, s.stop)
go s.usPub.Run(beatchan, s.stop)
}
// Monitor tracks the health of the Server. If the Server is ever deemed
// unhealthy, the Server is restarted.
func (s *Server) Monitor() {
err := s.mon.Monitor(s.hrt, s.stop)
if err != nil {
log.Errorf("Server monitor triggered: %v", err)
s.Stop()
s.Run()
}
}
func (s *Server) Stop() {
close(s.stop)
}
func (s *Server) Purge() {
s.aReconciler.Purge(s.agent)
s.usPub.Purge()
s.engine.Purge()
s.hrt.Clear()
}
func (s *Server) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Agent *agent.Agent
UnitStatePublisher *agent.UnitStatePublisher
UnitStateGenerator *unit.UnitStateGenerator
}{
Agent: s.agent,
UnitStatePublisher: s.usPub,
UnitStateGenerator: s.usGen,
})
}