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service: add Config.Executable field to allow service to control other binaries.

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This commit is contained in:
Daniel Theophanes
2015-03-14 08:49:17 -07:00
parent 17f5541e81
commit 49d681e0cb
6 changed files with 344 additions and 339 deletions
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service.go
+334 -321
View File
@@ -1,321 +1,334 @@
// Copyright 2015 Daniel Theophanes.
// Use of this source code is governed by a zlib-style
// license that can be found in the LICENSE file.package service
// Package service provides a simple way to create a system service.
// Currently supports Windows, Linux/(systemd | Upstart | SysV), and OSX/Launchd.
//
// Windows controls services by setting up callbacks that is non-trivial. This
// is very different then other systems. This package provides the same API
// despite the substantial differences.
// It also can be used to detect how a program is called, from an interactive
// terminal or from a service manager.
//
// Examples in the example/ folder.
//
// package main
//
// import (
// "log"
//
// "github.com/kardianos/service"
// )
//
// var logger service.Logger
//
// type program struct{}
//
// func (p *program) Start(s service.Service) error {
// // Start should not block. Do the actual work async.
// go p.run()
// return nil
// }
// func (p *program) run() {
// // Do work here
// }
// func (p *program) Stop(s service.Service) error {
// // Stop should not block. Return with a few seconds.
// return nil
// }
//
// func main() {
// svcConfig := &service.Config{
// Name: "GoServiceTest",
// DisplayName: "Go Service Test",
// Description: "This is a test Go service.",
// }
//
// prg := &program{}
// s, err := service.New(prg, svcConfig)
// if err != nil {
// log.Fatal(err)
// }
// logger, err = s.Logger(nil)
// if err != nil {
// log.Fatal(err)
// }
// err = s.Run()
// if err != nil {
// logger.Error(err)
// }
// }
package service // import "github.com/kardianos/service"
import (
"errors"
"fmt"
)
// Config provides the setup for a Service. The Name field is required.
type Config struct {
Name string // Required name of the service. No spaces suggested.
DisplayName string // Display name, spaces allowed.
Description string // Long description of service.
Dependencies []string // Array of service dependencies.
UserName string // Run as username.
Arguments []string // Run with arguments.
WorkingDirectory string // Service working directory.
ChRoot string
UserService bool // Install as a current user service.
// System specific options.
Option KeyValue
}
var (
system System
systemRegistry []System
)
var (
// ErrNameFieldRequired is returned when Conifg.Name is empty.
ErrNameFieldRequired = errors.New("Config.Name field is required.")
// ErrNoServiceSystemDetected is returned when no system was detected.
ErrNoServiceSystemDetected = errors.New("No service system detected.")
)
// New creates a new service based on a service interface and configuration.
func New(i Interface, c *Config) (Service, error) {
if len(c.Name) == 0 {
return nil, ErrNameFieldRequired
}
if system == nil {
return nil, ErrNoServiceSystemDetected
}
return system.New(i, c)
}
// KeyValue provides a list of platform specific options. See platform docs for
// more details.
type KeyValue map[string]interface{}
// Bool returns the value of the given name, assuming the value is a boolean.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) bool(name string, defaultValue bool) bool {
if v, found := kv[name]; found {
if castValue, is := v.(bool); is {
return castValue
}
}
return defaultValue
}
// Int returns the value of the given name, assuming the value is an int.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) int(name string, defaultValue int) int {
if v, found := kv[name]; found {
if castValue, is := v.(int); is {
return castValue
}
}
return defaultValue
}
// Int returns the value of the given name, assuming the value is a string.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) string(name string, defaultValue string) string {
if v, found := kv[name]; found {
if castValue, is := v.(string); is {
return castValue
}
}
return defaultValue
}
// Int returns the value of the given name, assuming the value is a float64.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) float64(name string, defaultValue float64) float64 {
if v, found := kv[name]; found {
if castValue, is := v.(float64); is {
return castValue
}
}
return defaultValue
}
// Platform returns a description of the system service.
func Platform() string {
if system == nil {
return ""
}
return system.String()
}
// Interactive returns false if running under the OS service manager
// and true otherwise.
func Interactive() bool {
if system == nil {
return true
}
return system.Interactive()
}
func newSystem() System {
for _, choice := range systemRegistry {
if choice.Detect() == false {
continue
}
return choice
}
return nil
}
// ChooseSystem chooses a system from the given system services.
// SystemServices are considered in the order they are suggested.
// Calling this may change what Interactive and Platform return.
func ChooseSystem(a ...System) {
systemRegistry = a
system = newSystem()
}
// ChosenSystem returns the system that service will use.
func ChosenSystem() System {
return system
}
// AvailableSystems returns the list of system services considered
// when choosing the system service.
func AvailableSystems() []System {
return systemRegistry
}
// System represents the service manager that is available.
type System interface {
// String returns a description of the system.
String() string
// Detect returns true if the system is available to use.
Detect() bool
// Interactive returns false if running under the system service manager
// and true otherwise.
Interactive() bool
// New creates a new service for this system.
New(i Interface, c *Config) (Service, error)
}
// Interface represents the service interface for a program. Start runs before
// the hosting process is granted control and Stop runs when control is returned.
//
// 1. OS service manager executes user program.
// 2. User program sees it is executed from a service manager (IsInteractive is false).
// 3. User program calls Service.Run() which blocks.
// 4. Interface.Start() is called and quickly returns.
// 5. User program runs.
// 6. OS service manager signals the user program to stop.
// 7. Interface.Stop() is called and quickly returns.
// - For a successful exit, os.Exit should not be called in Interface.Stop().
// 8. Service.Run returns.
// 9. User program should quickly exit.
type Interface interface {
// Start provides a place to initiate the service. The service doesn't not
// signal a completed start until after this function returns, so the
// Start function must not take more then a few seconds at most.
Start(s Service) error
// Stop provides a place to clean up program execution before it is terminated.
// It should not take more then a few seconds to execute.
// Stop should not call os.Exit directly in the function.
Stop(s Service) error
}
// TODO: Add Configure to Service interface.
// Service represents a service that can be run or controlled.
type Service interface {
// Run should be called shortly after the program entry point.
// After Interface.Stop has finished running, Run will stop blocking.
// After Run stops blocking, the program must exit shortly after.
Run() error
// Start signals to the OS service manager the given service should start.
Start() error
// Stop signals to the OS service manager the given service should stop.
Stop() error
// Restart signals to the OS service manager the given service should stop then start.
Restart() error
// Install setups up the given service in the OS service manager. This may require
// greater rights. Will return an error if it is already installed.
Install() error
// Uninstall removes the given service from the OS service manager. This may require
// greater rights. Will return an error if the service is not present.
Uninstall() error
// Opens and returns a system logger. If the user program is running
// interactively rather then as a service, the returned logger will write to
// os.Stderr. If errs is non-nil errors will be sent on errs as well as
// returned from Logger's functions.
Logger(errs chan<- error) (Logger, error)
// SystemLogger opens and returns a system logger. If errs is non-nil errors
// will be sent on errs as well as returned from Logger's functions.
SystemLogger(errs chan<- error) (Logger, error)
// String displays the name of the service. The display name if present,
// otherwise the name.
String() string
}
// ControlAction list valid string texts to use in Control.
var ControlAction = [5]string{"start", "stop", "restart", "install", "uninstall"}
// Control issues control functions to the service from a given action string.
func Control(s Service, action string) error {
var err error
switch action {
case ControlAction[0]:
err = s.Start()
case ControlAction[1]:
err = s.Stop()
case ControlAction[2]:
err = s.Restart()
case ControlAction[3]:
err = s.Install()
case ControlAction[4]:
err = s.Uninstall()
default:
err = fmt.Errorf("Unknown action %s", action)
}
if err != nil {
return fmt.Errorf("Failed to %s %v: %v", action, s, err)
}
return nil
}
// Logger writes to the system log.
type Logger interface {
Error(v ...interface{}) error
Warning(v ...interface{}) error
Info(v ...interface{}) error
Errorf(format string, a ...interface{}) error
Warningf(format string, a ...interface{}) error
Infof(format string, a ...interface{}) error
}
// Copyright 2015 Daniel Theophanes.
// Use of this source code is governed by a zlib-style
// license that can be found in the LICENSE file.package service
// Package service provides a simple way to create a system service.
// Currently supports Windows, Linux/(systemd | Upstart | SysV), and OSX/Launchd.
//
// Windows controls services by setting up callbacks that is non-trivial. This
// is very different then other systems. This package provides the same API
// despite the substantial differences.
// It also can be used to detect how a program is called, from an interactive
// terminal or from a service manager.
//
// Examples in the example/ folder.
//
// package main
//
// import (
// "log"
//
// "github.com/kardianos/service"
// )
//
// var logger service.Logger
//
// type program struct{}
//
// func (p *program) Start(s service.Service) error {
// // Start should not block. Do the actual work async.
// go p.run()
// return nil
// }
// func (p *program) run() {
// // Do work here
// }
// func (p *program) Stop(s service.Service) error {
// // Stop should not block. Return with a few seconds.
// return nil
// }
//
// func main() {
// svcConfig := &service.Config{
// Name: "GoServiceTest",
// DisplayName: "Go Service Test",
// Description: "This is a test Go service.",
// }
//
// prg := &program{}
// s, err := service.New(prg, svcConfig)
// if err != nil {
// log.Fatal(err)
// }
// logger, err = s.Logger(nil)
// if err != nil {
// log.Fatal(err)
// }
// err = s.Run()
// if err != nil {
// logger.Error(err)
// }
// }
package service // import "github.com/kardianos/service"
import (
"errors"
"fmt"
"path/filepath"
"github.com/kardianos/osext"
)
// Config provides the setup for a Service. The Name field is required.
type Config struct {
Name string // Required name of the service. No spaces suggested.
DisplayName string // Display name, spaces allowed.
Description string // Long description of service.
Dependencies []string // Array of service dependencies.
UserName string // Run as username.
Arguments []string // Run with arguments.
// Optional field to specify the executable for service.
// If empty the current executable is used.
Executable string
WorkingDirectory string // Service working directory.
ChRoot string
UserService bool // Install as a current user service.
// System specific options.
Option KeyValue
}
func (c *Config) execPath() (string, error) {
if len(c.Executable) != 0 {
return filepath.Abs(c.Executable)
}
return osext.Executable()
}
var (
system System
systemRegistry []System
)
var (
// ErrNameFieldRequired is returned when Conifg.Name is empty.
ErrNameFieldRequired = errors.New("Config.Name field is required.")
// ErrNoServiceSystemDetected is returned when no system was detected.
ErrNoServiceSystemDetected = errors.New("No service system detected.")
)
// New creates a new service based on a service interface and configuration.
func New(i Interface, c *Config) (Service, error) {
if len(c.Name) == 0 {
return nil, ErrNameFieldRequired
}
if system == nil {
return nil, ErrNoServiceSystemDetected
}
return system.New(i, c)
}
// KeyValue provides a list of platform specific options. See platform docs for
// more details.
type KeyValue map[string]interface{}
// Bool returns the value of the given name, assuming the value is a boolean.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) bool(name string, defaultValue bool) bool {
if v, found := kv[name]; found {
if castValue, is := v.(bool); is {
return castValue
}
}
return defaultValue
}
// Int returns the value of the given name, assuming the value is an int.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) int(name string, defaultValue int) int {
if v, found := kv[name]; found {
if castValue, is := v.(int); is {
return castValue
}
}
return defaultValue
}
// Int returns the value of the given name, assuming the value is a string.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) string(name string, defaultValue string) string {
if v, found := kv[name]; found {
if castValue, is := v.(string); is {
return castValue
}
}
return defaultValue
}
// Int returns the value of the given name, assuming the value is a float64.
// If the value isn't found or is not of the type, the defaultValue is returned.
func (kv KeyValue) float64(name string, defaultValue float64) float64 {
if v, found := kv[name]; found {
if castValue, is := v.(float64); is {
return castValue
}
}
return defaultValue
}
// Platform returns a description of the system service.
func Platform() string {
if system == nil {
return ""
}
return system.String()
}
// Interactive returns false if running under the OS service manager
// and true otherwise.
func Interactive() bool {
if system == nil {
return true
}
return system.Interactive()
}
func newSystem() System {
for _, choice := range systemRegistry {
if choice.Detect() == false {
continue
}
return choice
}
return nil
}
// ChooseSystem chooses a system from the given system services.
// SystemServices are considered in the order they are suggested.
// Calling this may change what Interactive and Platform return.
func ChooseSystem(a ...System) {
systemRegistry = a
system = newSystem()
}
// ChosenSystem returns the system that service will use.
func ChosenSystem() System {
return system
}
// AvailableSystems returns the list of system services considered
// when choosing the system service.
func AvailableSystems() []System {
return systemRegistry
}
// System represents the service manager that is available.
type System interface {
// String returns a description of the system.
String() string
// Detect returns true if the system is available to use.
Detect() bool
// Interactive returns false if running under the system service manager
// and true otherwise.
Interactive() bool
// New creates a new service for this system.
New(i Interface, c *Config) (Service, error)
}
// Interface represents the service interface for a program. Start runs before
// the hosting process is granted control and Stop runs when control is returned.
//
// 1. OS service manager executes user program.
// 2. User program sees it is executed from a service manager (IsInteractive is false).
// 3. User program calls Service.Run() which blocks.
// 4. Interface.Start() is called and quickly returns.
// 5. User program runs.
// 6. OS service manager signals the user program to stop.
// 7. Interface.Stop() is called and quickly returns.
// - For a successful exit, os.Exit should not be called in Interface.Stop().
// 8. Service.Run returns.
// 9. User program should quickly exit.
type Interface interface {
// Start provides a place to initiate the service. The service doesn't not
// signal a completed start until after this function returns, so the
// Start function must not take more then a few seconds at most.
Start(s Service) error
// Stop provides a place to clean up program execution before it is terminated.
// It should not take more then a few seconds to execute.
// Stop should not call os.Exit directly in the function.
Stop(s Service) error
}
// TODO: Add Configure to Service interface.
// Service represents a service that can be run or controlled.
type Service interface {
// Run should be called shortly after the program entry point.
// After Interface.Stop has finished running, Run will stop blocking.
// After Run stops blocking, the program must exit shortly after.
Run() error
// Start signals to the OS service manager the given service should start.
Start() error
// Stop signals to the OS service manager the given service should stop.
Stop() error
// Restart signals to the OS service manager the given service should stop then start.
Restart() error
// Install setups up the given service in the OS service manager. This may require
// greater rights. Will return an error if it is already installed.
Install() error
// Uninstall removes the given service from the OS service manager. This may require
// greater rights. Will return an error if the service is not present.
Uninstall() error
// Opens and returns a system logger. If the user program is running
// interactively rather then as a service, the returned logger will write to
// os.Stderr. If errs is non-nil errors will be sent on errs as well as
// returned from Logger's functions.
Logger(errs chan<- error) (Logger, error)
// SystemLogger opens and returns a system logger. If errs is non-nil errors
// will be sent on errs as well as returned from Logger's functions.
SystemLogger(errs chan<- error) (Logger, error)
// String displays the name of the service. The display name if present,
// otherwise the name.
String() string
}
// ControlAction list valid string texts to use in Control.
var ControlAction = [5]string{"start", "stop", "restart", "install", "uninstall"}
// Control issues control functions to the service from a given action string.
func Control(s Service, action string) error {
var err error
switch action {
case ControlAction[0]:
err = s.Start()
case ControlAction[1]:
err = s.Stop()
case ControlAction[2]:
err = s.Restart()
case ControlAction[3]:
err = s.Install()
case ControlAction[4]:
err = s.Uninstall()
default:
err = fmt.Errorf("Unknown action %s", action)
}
if err != nil {
return fmt.Errorf("Failed to %s %v: %v", action, s, err)
}
return nil
}
// Logger writes to the system log.
type Logger interface {
Error(v ...interface{}) error
Warning(v ...interface{}) error
Info(v ...interface{}) error
Errorf(format string, a ...interface{}) error
Warningf(format string, a ...interface{}) error
Infof(format string, a ...interface{}) error
}
service_darwin.go
+1 -3
View File
@@ -12,8 +12,6 @@ import (
"syscall"
"text/template"
"time"
"github.com/kardianos/osext"
)
const maxPathSize = 32 * 1024
@@ -98,7 +96,7 @@ func (s *darwinLaunchdService) Install() error {
}
defer f.Close()
path, err := osext.Executable()
path, err := s.execPath()
if err != nil {
return err
}
service_systemd_linux.go
+1 -3
View File
@@ -12,8 +12,6 @@ import (
"syscall"
"text/template"
"time"
"github.com/kardianos/osext"
)
func isSystemd() bool {
@@ -75,7 +73,7 @@ func (s *systemd) Install() error {
}
defer f.Close()
path, err := osext.Executable()
path, err := s.execPath()
if err != nil {
return err
}
service_sysv_linux.go
+1 -3
View File
@@ -12,8 +12,6 @@ import (
"syscall"
"text/template"
"time"
"github.com/kardianos/osext"
)
type sysv struct {
@@ -67,7 +65,7 @@ func (s *sysv) Install() error {
}
defer f.Close()
path, err := osext.Executable()
path, err := s.execPath()
if err != nil {
return err
}
service_upstart_linux.go
+5 -7
View File
@@ -8,12 +8,10 @@ import (
"errors"
"fmt"
"os"
"os/exec"
"os/signal"
"syscall"
"text/template"
"time"
"github.com/kardianos/osext"
)
func isUpstart() bool {
@@ -77,7 +75,7 @@ func (s *upstart) Install() error {
}
defer f.Close()
path, err := osext.Executable()
path, err := s.execPath()
if err != nil {
return err
}
@@ -122,7 +120,7 @@ func (s *upstart) Run() (err error) {
sigChan := make(chan os.Signal, 3)
signal.Notify(sigChan, syscall.SIGTERM, os.Interrupt)
signal.Notify(sigChan, os.Interrupt, os.Kill)
<-sigChan
@@ -130,11 +128,11 @@ func (s *upstart) Run() (err error) {
}
func (s *upstart) Start() error {
return run("initctl", "start", s.Name)
return exec.Command("initctl", "start", s.Name).Run()
}
func (s *upstart) Stop() error {
return run("initctl", "stop", s.Name)
return exec.Command("initctl", "stop", s.Name).Run()
}
func (s *upstart) Restart() error {
service_windows.go
+2 -2
View File
@@ -16,7 +16,6 @@ import (
"code.google.com/p/winsvc/eventlog"
"code.google.com/p/winsvc/mgr"
"code.google.com/p/winsvc/svc"
"github.com/kardianos/osext"
)
const version = "Windows Service"
@@ -165,10 +164,11 @@ loop:
}
func (ws *windowsService) Install() error {
exepath, err := osext.Executable()
exepath, err := ws.execPath()
if err != nil {
return err
}
binPath := &bytes.Buffer{}
// Quote exe path in case it contains a string.
binPath.WriteRune('"')