micro/runtime/default.go

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package runtime
import (
"errors"
"os"
"strings"
"sync"
"time"
"github.com/micro/go-micro/runtime/package"
"github.com/micro/go-micro/runtime/process"
proc "github.com/micro/go-micro/runtime/process/os"
"github.com/micro/go-micro/util/log"
)
type runtime struct {
sync.RWMutex
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// used to stop the runtime
closed chan bool
// used to start new services
start chan *service
// indicates if we're running
running bool
// the service map
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services map[string]*service
}
type service struct {
sync.RWMutex
running bool
closed chan bool
err error
// service to manage
*Service
// process creator
Process *proc.Process
// Exec
Exec *process.Executable
// process pid
PID *process.PID
}
func newRuntime() *runtime {
return &runtime{
closed: make(chan bool),
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start: make(chan *service, 128),
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services: make(map[string]*service),
}
}
func newService(s *Service) *service {
parts := strings.Split(s.Exec, " ")
exec := parts[0]
args := []string{}
if len(parts) > 1 {
args = parts[1:]
}
return &service{
Service: s,
Process: new(proc.Process),
Exec: &process.Executable{
Binary: &packager.Binary{
Name: s.Name,
Path: exec,
},
Env: os.Environ(),
Args: args,
},
}
}
func (s *service) Running() bool {
s.RLock()
defer s.RUnlock()
return s.running
}
func (s *service) Start() error {
s.Lock()
defer s.Unlock()
if s.running {
return nil
}
// reset
s.err = nil
s.closed = make(chan bool)
// TODO: pull source & build binary
p, err := s.Process.Fork(s.Exec)
if err != nil {
return err
}
// set the pid
s.PID = p
// set to running
s.running = true
// wait and watch
go s.Wait()
return nil
}
func (s *service) Stop() error {
s.Lock()
defer s.Unlock()
select {
case <-s.closed:
return nil
default:
close(s.closed)
s.running = false
return s.Process.Kill(s.PID)
}
return nil
}
func (s *service) Error() error {
s.RLock()
defer s.RUnlock()
return s.err
}
func (s *service) Wait() {
// wait for process to exit
err := s.Process.Wait(s.PID)
s.Lock()
defer s.Unlock()
// save the error
if err != nil {
s.err = err
}
// no longer running
s.running = false
}
func (r *runtime) Create(s *Service) error {
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r.Lock()
defer r.Unlock()
if _, ok := r.services[s.Name]; ok {
return errors.New("service already registered")
}
// save service
r.services[s.Name] = newService(s)
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// push into start queue
r.start <- r.services[s.Name]
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return nil
}
func (r *runtime) Delete(s *Service) error {
r.Lock()
defer r.Unlock()
if s, ok := r.services[s.Name]; ok {
delete(r.services, s.Name)
return s.Stop()
}
return nil
}
func (r *runtime) Start() error {
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r.Lock()
// already running
if r.running {
r.Unlock()
return nil
}
// set running
r.running = true
r.closed = make(chan bool)
closed := r.closed
r.Unlock()
t := time.NewTicker(time.Second * 5)
defer t.Stop()
for {
select {
case <-t.C:
// check running services
r.RLock()
for _, service := range r.services {
if service.Running() {
continue
}
// TODO: check service error
log.Debugf("Starting %s", service.Name)
if err := service.Start(); err != nil {
log.Debugf("Error starting %s: %v", service.Name, err)
}
}
r.RUnlock()
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case service := <-r.start:
if service.Running() {
continue
}
// TODO: check service error
log.Debugf("Starting %s", service.Name)
if err := service.Start(); err != nil {
log.Debugf("Error starting %s: %v", service.Name, err)
}
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case <-closed:
// TODO: stop all the things
return nil
}
}
return nil
}
func (r *runtime) Stop() error {
r.Lock()
defer r.Unlock()
if !r.running {
return nil
}
select {
case <-r.closed:
return nil
default:
close(r.closed)
// set not running
r.running = false
// stop all the services
for _, service := range r.services {
service.Stop()
}
}
return nil
}