func (n Nginx) Reload() error {
n.Lock()
defer n.Unlock()
switch cfg.Current.Nginx.Mode {
case "systemd":
if n.Systemd == nil {
c, err := dbus.NewSystemdConnection()
if err != nil {
return err
}
n.Systemd = c
}
ch := make(chan string)
_, err := n.Systemd.ReloadUnit(cfg.Current.Nginx.Systemd.Service, "replace", ch)
if err != nil {
return err
}
<-ch
return nil
default:
return errors.New("unknown Nginx mode")
}
panic("unreachable")
}
func (obj *ServiceType) Apply() bool {
log.Printf("%v[%v]: Apply", obj.GetType(), obj.GetName())
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
var files = []string{service} // the service represented in a list
if obj.Startup == "enabled" {
_, _, err = conn.EnableUnitFiles(files, false, true)
} else if obj.Startup == "disabled" {
_, err = conn.DisableUnitFiles(files, false)
} else {
err = nil
}
if err != nil {
log.Printf("Unable to change startup status: %v", err)
return false
}
result := make(chan string, 1) // catch result information
if obj.State == "running" {
_, err := conn.StartUnit(service, "fail", result)
if err != nil {
log.Fatal("Failed to start unit: ", err)
return false
}
} else if obj.State == "stopped" {
_, err = conn.StopUnit(service, "fail", result)
if err != nil {
log.Fatal("Failed to stop unit: ", err)
return false
}
} else {
log.Fatal("Unknown state: ", obj.State)
}
status := <-result
if &status == nil {
log.Fatal("Result is nil")
return false
}
if status != "done" {
log.Fatal("Unknown return string: ", status)
return false
}
// XXX: also set enabled on boot
return true
}
// WaitOnDevices waits for the devices named in devs to be plugged before returning.
func WaitOnDevices(devs []string, stage string) error {
conn, err := dbus.NewSystemdConnection()
if err != nil {
return err
}
results := map[string]chan string{}
for _, dev := range devs {
unitName := unit.UnitNamePathEscape(dev + ".device")
results[unitName] = make(chan string)
if _, err = conn.StartUnit(unitName, "replace", results[unitName]); err != nil {
return fmt.Errorf("failed starting device unit %s: %v", unitName, err)
}
}
for unitName, result := range results {
s := <-result
if s != "done" {
return fmt.Errorf("device unit %s %s", unitName, s)
}
}
return nil
}
// Reload tells haproxy to reload its configuration
func Reload() (err error) {
conn, err := dbus.NewSystemdConnection()
if err != nil {
return err
}
_, err = conn.RestartUnit("haproxy.cycore@"+instanceID+".service", "ignore-dependencies", nil)
return err
}
func (obj *ServiceType) StateOK() bool {
if obj.isStateOK { // cache the state
return true
}
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
loadstate, err := conn.GetUnitProperty(service, "LoadState")
if err != nil {
log.Printf("Failed to get load state: %v", err)
return false
}
// NOTE: we have to compare variants with other variants, they are really strings...
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound {
log.Printf("Failed to find service: %v", service)
return false
}
// XXX: check service "enabled at boot" or not status...
//conn.GetUnitProperties(service)
activestate, err := conn.GetUnitProperty(service, "ActiveState")
if err != nil {
log.Fatal("Failed to get active state: ", err)
}
var running = (activestate.Value == dbus.MakeVariant("active"))
if obj.State == "running" {
if !running {
return false // we are in the wrong state
}
} else if obj.State == "stopped" {
if running {
return false
}
} else {
log.Fatal("Unknown state: ", obj.State)
}
return true // all is good, no state change needed
}
func (s *ServiceStatus) Init() error {
var err error
if s.Name == "" {
return e.New(ErrInvServName)
}
s.conn, err = sd.NewSystemdConnection()
if err != nil {
return e.Forward(err)
}
err = s.conn.Subscribe()
if err != nil {
return e.Forward(err)
}
ch, cherr := s.conn.SubscribeUnits(s.Interval)
go func() {
for {
select {
case status := <-ch:
if status == nil {
continue
}
st, found := status[s.Name]
if !found {
log.Tag("systemd").Printf("Status of %v is unknow.", s.Name)
s.setStatus(Unknow)
continue
}
if s == nil {
s.setStatus(Deleted)
continue
}
if st.LoadState == "loaded" && st.ActiveState == "active" && st.SubState == "running" {
s.setStatus(Running)
} else if st.LoadState == "loaded" && st.ActiveState == "active" && st.SubState == "active" {
s.setStatus(Running)
} else if st.LoadState == "not-found" && st.ActiveState == "active" && st.SubState == "exited" {
s.setStatus(Stopped)
} else if st.LoadState == "loaded" && st.ActiveState == "inactive" && st.SubState == "dead" {
s.setStatus(Stopped)
} else {
//ActiveState: deactivating, LoadState: loaded, SubState: stop-sigterm
log.Tag("systemd").Printf("ActiveState: %v, LoadState: %v, SubState: %v", st.ActiveState, st.LoadState, st.SubState)
s.setStatus(Other)
}
case err := <-cherr:
log.Tag("systemd", "service", "status").Fatalln("SubscribeUnits error:", err)
}
}
}()
return nil
}
// Watch is the primary listener for this resource and it outputs events.
func (obj *SvcRes) Watch(processChan chan event.Event) error {
if obj.IsWatching() {
return nil
}
obj.SetWatching(true)
defer obj.SetWatching(false)
cuid := obj.converger.Register()
defer cuid.Unregister()
var startup bool
Startup := func(block bool) <-chan time.Time {
if block {
return nil // blocks forever
//return make(chan time.Time) // blocks forever
}
return time.After(time.Duration(500) * time.Millisecond) // 1/2 the resolution of converged timeout
}
// obj.Name: svc name
if !systemdUtil.IsRunningSystemd() {
return fmt.Errorf("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
return errwrap.Wrapf(err, "Failed to connect to systemd")
}
defer conn.Close()
// if we share the bus with others, we will get each others messages!!
bus, err := util.SystemBusPrivateUsable() // don't share the bus connection!
if err != nil {
return errwrap.Wrapf(err, "Failed to connect to bus")
}
// XXX: will this detect new units?
bus.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal',interface='org.freedesktop.systemd1.Manager',member='Reloading'")
buschan := make(chan *dbus.Signal, 10)
bus.Signal(buschan)
var svc = fmt.Sprintf("%s.service", obj.Name) // systemd name
var send = false // send event?
var exit = false
var invalid = false // does the svc exist or not?
var previous bool // previous invalid value
set := conn.NewSubscriptionSet() // no error should be returned
subChannel, subErrors := set.Subscribe()
var activeSet = false
for {
// XXX: watch for an event for new units...
// XXX: detect if startup enabled/disabled value changes...
previous = invalid
invalid = false
// firstly, does svc even exist or not?
loadstate, err := conn.GetUnitProperty(svc, "LoadState")
if err != nil {
log.Printf("Failed to get property: %v", err)
invalid = true
}
if !invalid {
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound { // XXX: in the loop we'll handle changes better...
log.Printf("Failed to find svc: %s", svc)
invalid = true // XXX: ?
}
}
if previous != invalid { // if invalid changed, send signal
send = true
obj.StateOK(false) // dirty
}
if invalid {
log.Printf("Waiting for: %s", svc) // waiting for svc to appear...
if activeSet {
activeSet = false
set.Remove(svc) // no return value should ever occur
}
obj.SetState(ResStateWatching) // reset
select {
case <-buschan: // XXX: wait for new units event to unstick
cuid.SetConverged(false)
// loop so that we can see the changed invalid signal
log.Printf("Svc[%s]->DaemonReload()", svc)
case event := <-obj.Events():
cuid.SetConverged(false)
if exit, send = obj.ReadEvent(&event); exit {
return nil // exit
}
case <-cuid.ConvergedTimer():
cuid.SetConverged(true) // converged!
continue
case <-Startup(startup):
cuid.SetConverged(false)
send = true
obj.StateOK(false) // dirty
}
} else {
if !activeSet {
activeSet = true
set.Add(svc) // no return value should ever occur
}
log.Printf("Watching: %s", svc) // attempting to watch...
obj.SetState(ResStateWatching) // reset
select {
case event := <-subChannel:
log.Printf("Svc event: %+v", event)
// NOTE: the value returned is a map for some reason...
if event[svc] != nil {
// event[svc].ActiveState is not nil
switch event[svc].ActiveState {
case "active":
log.Printf("Svc[%s]->Started", svc)
case "inactive":
log.Printf("Svc[%s]->Stopped", svc)
case "reloading":
log.Printf("Svc[%s]->Reloading", svc)
default:
log.Fatalf("Unknown svc state: %s", event[svc].ActiveState)
}
} else {
// svc stopped (and ActiveState is nil...)
log.Printf("Svc[%s]->Stopped", svc)
}
send = true
obj.StateOK(false) // dirty
case err := <-subErrors:
cuid.SetConverged(false)
return errwrap.Wrapf(err, "Unknown %s[%s] error", obj.Kind(), obj.GetName())
case event := <-obj.Events():
cuid.SetConverged(false)
if exit, send = obj.ReadEvent(&event); exit {
return nil // exit
}
case <-cuid.ConvergedTimer():
cuid.SetConverged(true) // converged!
continue
case <-Startup(startup):
cuid.SetConverged(false)
send = true
obj.StateOK(false) // dirty
}
}
if send {
startup = true // startup finished
send = false
if exit, err := obj.DoSend(processChan, ""); exit || err != nil {
return err // we exit or bubble up a NACK...
}
}
}
}
// CheckApply checks the resource state and applies the resource if the bool
// input is true. It returns error info and if the state check passed or not.
func (obj *SvcRes) CheckApply(apply bool) (checkOK bool, err error) {
if !systemdUtil.IsRunningSystemd() {
return false, fmt.Errorf("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
return false, errwrap.Wrapf(err, "Failed to connect to systemd")
}
defer conn.Close()
var svc = fmt.Sprintf("%s.service", obj.Name) // systemd name
loadstate, err := conn.GetUnitProperty(svc, "LoadState")
if err != nil {
return false, errwrap.Wrapf(err, "Failed to get load state")
}
// NOTE: we have to compare variants with other variants, they are really strings...
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound {
return false, errwrap.Wrapf(err, "Failed to find svc: %s", svc)
}
// XXX: check svc "enabled at boot" or not status...
//conn.GetUnitProperties(svc)
activestate, err := conn.GetUnitProperty(svc, "ActiveState")
if err != nil {
return false, errwrap.Wrapf(err, "Failed to get active state")
}
var running = (activestate.Value == dbus.MakeVariant("active"))
var stateOK = ((obj.State == "") || (obj.State == "running" && running) || (obj.State == "stopped" && !running))
var startupOK = true // XXX: DETECT AND SET
var refresh = obj.Refresh() // do we have a pending reload to apply?
if stateOK && startupOK && !refresh {
return true, nil // we are in the correct state
}
// state is not okay, no work done, exit, but without error
if !apply {
return false, nil
}
// apply portion
log.Printf("%s[%s]: Apply", obj.Kind(), obj.GetName())
var files = []string{svc} // the svc represented in a list
if obj.Startup == "enabled" {
_, _, err = conn.EnableUnitFiles(files, false, true)
} else if obj.Startup == "disabled" {
_, err = conn.DisableUnitFiles(files, false)
}
if err != nil {
return false, errwrap.Wrapf(err, "Unable to change startup status")
}
// XXX: do we need to use a buffered channel here?
result := make(chan string, 1) // catch result information
if obj.State == "running" {
_, err = conn.StartUnit(svc, "fail", result)
if err != nil {
return false, errwrap.Wrapf(err, "Failed to start unit")
}
if refresh {
log.Printf("%s[%s]: Skipping reload, due to pending start", obj.Kind(), obj.GetName())
}
refresh = false // we did a start, so a reload is not needed
} else if obj.State == "stopped" {
_, err = conn.StopUnit(svc, "fail", result)
if err != nil {
return false, errwrap.Wrapf(err, "Failed to stop unit")
}
if refresh {
log.Printf("%s[%s]: Skipping reload, due to pending stop", obj.Kind(), obj.GetName())
}
refresh = false // we did a stop, so a reload is not needed
}
status := <-result
if &status == nil {
return false, fmt.Errorf("Systemd service action result is nil")
}
if status != "done" {
return false, fmt.Errorf("Unknown systemd return string: %v", status)
}
if refresh { // we need to reload the service
// XXX: run a svc reload here!
log.Printf("%s[%s]: Reloading...", obj.Kind(), obj.GetName())
}
// XXX: also set enabled on boot
return false, nil // success
}
// Service watcher
func (obj *ServiceType) Watch() {
if obj.IsWatching() {
return
}
obj.SetWatching(true)
defer obj.SetWatching(false)
// obj.Name: service name
//vertex := obj.GetVertex() // stored with SetVertex
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
bus, err := dbus.SystemBus()
if err != nil {
log.Fatal("Failed to connect to bus: ", err)
}
// XXX: will this detect new units?
bus.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal',interface='org.freedesktop.systemd1.Manager',member='Reloading'")
buschan := make(chan *dbus.Signal, 10)
bus.Signal(buschan)
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
var send = false // send event?
var dirty = false
var invalid = false // does the service exist or not?
var previous bool // previous invalid value
set := conn.NewSubscriptionSet() // no error should be returned
subChannel, subErrors := set.Subscribe()
var activeSet = false
for {
// XXX: watch for an event for new units...
// XXX: detect if startup enabled/disabled value changes...
previous = invalid
invalid = false
// firstly, does service even exist or not?
loadstate, err := conn.GetUnitProperty(service, "LoadState")
if err != nil {
log.Printf("Failed to get property: %v", err)
invalid = true
}
if !invalid {
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound { // XXX: in the loop we'll handle changes better...
log.Printf("Failed to find service: %v", service)
invalid = true // XXX ?
}
}
if previous != invalid { // if invalid changed, send signal
send = true
dirty = true
}
if invalid {
log.Printf("Waiting for: %v", service) // waiting for service to appear...
if activeSet {
activeSet = false
set.Remove(service) // no return value should ever occur
}
obj.SetState(typeWatching) // reset
select {
case _ = <-buschan: // XXX wait for new units event to unstick
obj.SetConvergedState(typeConvergedNil)
// loop so that we can see the changed invalid signal
log.Printf("Service[%v]->DaemonReload()", service)
case event := <-obj.events:
obj.SetConvergedState(typeConvergedNil)
if ok := obj.ReadEvent(&event); !ok {
return // exit
}
if event.GetActivity() {
dirty = true
}
send = true
case _ = <-TimeAfterOrBlock(obj.ctimeout):
obj.SetConvergedState(typeConvergedTimeout)
obj.converged <- true
continue
}
} else {
if !activeSet {
activeSet = true
set.Add(service) // no return value should ever occur
}
log.Printf("Watching: %v", service) // attempting to watch...
obj.SetState(typeWatching) // reset
select {
case event := <-subChannel:
log.Printf("Service event: %+v", event)
// NOTE: the value returned is a map for some reason...
if event[service] != nil {
// event[service].ActiveState is not nil
if event[service].ActiveState == "active" {
log.Printf("Service[%v]->Started()", service)
} else if event[service].ActiveState == "inactive" {
log.Printf("Service[%v]->Stopped!()", service)
} else {
log.Fatal("Unknown service state: ", event[service].ActiveState)
}
} else {
// service stopped (and ActiveState is nil...)
log.Printf("Service[%v]->Stopped", service)
}
send = true
dirty = true
case err := <-subErrors:
obj.SetConvergedState(typeConvergedNil) // XXX ?
log.Println("error:", err)
log.Fatal(err)
//vertex.events <- fmt.Sprintf("service: %v", "error") // XXX: how should we handle errors?
case event := <-obj.events:
obj.SetConvergedState(typeConvergedNil)
if ok := obj.ReadEvent(&event); !ok {
return // exit
}
if event.GetActivity() {
dirty = true
}
send = true
}
}
if send {
send = false
if dirty {
dirty = false
obj.isStateOK = false // something made state dirty
}
Process(obj) // XXX: rename this function
}
}
}
func (c *systemdCollector) newDbus() (*dbus.Conn, error) {
if *systemdPrivate {
return dbus.NewSystemdConnection()
}
return dbus.New()
}
func New(cfg Config) (*Collector, error) {
var conn *dbus.Conn
var err error
switch cfg.ConnType {
case ConnTypeDefault, ConnTypeDbus:
conn, err = dbus.New()
case ConnTypeDirect:
conn, err = dbus.NewSystemdConnection()
default:
return nil, fmt.Errorf("unhandled ConnType: %v", cfg.ConnType)
}
if err != nil {
return nil, fmt.Errorf("could not connect to systemd: %v", err)
}
c := &Collector{
conn: conn,
units: make(map[string]*unitMetrics),
}
if cfg.DisableLoaded {
c.loaded = nullmetric.NoopGaugeVec{}
} else {
c.loaded = c.metrics.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "systemd",
Subsystem: "units",
Name: "loaded",
Help: "1 if the unit is loaded, 0 otherwise.",
ConstLabels: cfg.ConstLabels,
},
[]string{"unit"},
)
}
if cfg.DisableActive {
c.active = nullmetric.NoopGaugeVec{}
} else {
c.active = c.metrics.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "systemd",
Subsystem: "units",
Name: "active",
Help: "1 if the unit is active, 0 otherwise.",
ConstLabels: cfg.ConstLabels,
},
[]string{"unit"},
)
}
if cfg.DisableFailed {
c.failed = nullmetric.NoopGaugeVec{}
} else {
c.failed = c.metrics.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "systemd",
Subsystem: "units",
Name: "failed",
Help: "1 if the unit has failed, 0 otherwise.",
ConstLabels: cfg.ConstLabels,
},
[]string{"unit"},
)
}
if len(c.metrics) == 0 {
return nil, fmt.Errorf("cannot disable all systemd metrics - remove [systemd] configuration instead")
}
return c, nil
}
// Service watcher
func (obj ServiceType) Watch(v *Vertex) {
// obj.Name: service name
if !util.IsRunningSystemd() {
log.Fatal("Systemd is not running.")
}
conn, err := systemd.NewSystemdConnection() // needs root access
if err != nil {
log.Fatal("Failed to connect to systemd: ", err)
}
defer conn.Close()
bus, err := dbus.SystemBus()
if err != nil {
log.Fatal("Failed to connect to bus: %v\n", err)
}
// XXX: will this detect new units?
bus.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
"type='signal',interface='org.freedesktop.systemd1.Manager',member='Reloading'")
buschan := make(chan *dbus.Signal, 10)
bus.Signal(buschan)
var service = fmt.Sprintf("%v.service", obj.Name) // systemd name
var send = false // send event?
var invalid = false // does the service exist or not?
var previous bool // previous invalid value
set := conn.NewSubscriptionSet() // no error should be returned
subChannel, subErrors := set.Subscribe()
var activeSet = false
for {
// XXX: watch for an event for new units...
// XXX: detect if startup enabled/disabled value changes...
previous = invalid
invalid = false
// firstly, does service even exist or not?
loadstate, err := conn.GetUnitProperty(service, "LoadState")
if err != nil {
log.Printf("Failed to get property: %v\n", err)
invalid = true
}
if !invalid {
var notFound = (loadstate.Value == dbus.MakeVariant("not-found"))
if notFound { // XXX: in the loop we'll handle changes better...
log.Printf("Failed to find service: %v\n", service)
invalid = true // XXX ?
}
}
if previous != invalid { // if invalid changed, send signal
send = true
}
if invalid {
log.Printf("Waiting for: %v\n", service) // waiting for service to appear...
if activeSet {
activeSet = false
set.Remove(service) // no return value should ever occur
}
select {
case _ = <-buschan: // XXX wait for new units event to unstick
// loop so that we can see the changed invalid signal
log.Printf("Service[%v]->DaemonReload()\n", service)
case exit := <-obj.Events:
if exit == "exit" {
return
} else {
log.Fatal("Unknown event: %v\n", exit)
}
}
} else {
if !activeSet {
activeSet = true
set.Add(service) // no return value should ever occur
}
log.Printf("Watching: %v\n", service) // attempting to watch...
select {
case event := <-subChannel:
log.Printf("Service event: %+v\n", event)
// NOTE: the value returned is a map for some reason...
if event[service] != nil {
// event[service].ActiveState is not nil
if event[service].ActiveState == "active" {
log.Printf("Service[%v]->Started()\n", service)
} else if event[service].ActiveState == "inactive" {
log.Printf("Service[%v]->Stopped!()\n", service)
} else {
log.Fatal("Unknown service state: ", event[service].ActiveState)
}
} else {
// service stopped (and ActiveState is nil...)
log.Printf("Service[%v]->Stopped\n", service)
}
send = true
case err := <-subErrors:
log.Println("error:", err)
log.Fatal(err)
v.Events <- fmt.Sprintf("service: %v", "error")
case exit := <-obj.Events:
if exit == "exit" {
return
} else {
log.Fatal("Unknown event: %v\n", exit)
}
}
}
if send {
send = false
//log.Println("Sending event!")
v.Events <- fmt.Sprintf("service(%v): %v", obj.Name, "event!") // FIXME: use struct
}
}
}
