forked from purpleidea/mgmt
/
service.go
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/
service.go
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// Mgmt
// Copyright (C) 2013-2016+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// NOTE: docs are found at: https://godoc.org/github.com/coreos/go-systemd/dbus
package main
import (
"fmt"
systemd "github.com/coreos/go-systemd/dbus" // change namespace
"github.com/coreos/go-systemd/util"
"github.com/godbus/dbus" // namespace collides with systemd wrapper
"log"
)
type ServiceType struct {
BaseType `yaml:",inline"`
State string `yaml:"state"` // state: running, stopped
Startup string `yaml:"startup"` // enabled, disabled, undefined
}
func NewServiceType(name, state, startup string) *ServiceType {
return &ServiceType{
BaseType: BaseType{
Name: name,
events: make(chan Event),
vertex: nil,
},
State: state,
Startup: startup,
}
}
func (obj *ServiceType) GetType() string {
return "Service"
}
// 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 (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 (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
}
func (obj *ServiceType) Compare(typ Type) bool {
switch typ.(type) {
case *ServiceType:
typ := typ.(*ServiceType)
if obj.Name != typ.Name {
return false
}
if obj.State != typ.State {
return false
}
if obj.Startup != typ.Startup {
return false
}
default:
return false
}
return true
}