157 lines
2.4 KiB
Go
157 lines
2.4 KiB
Go
package runtime
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import (
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"io"
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"sync"
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"time"
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"github.com/micro/go-micro/runtime/build"
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"github.com/micro/go-micro/runtime/process"
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proc "github.com/micro/go-micro/runtime/process/os"
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"github.com/micro/go-micro/util/log"
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)
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type service struct {
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sync.RWMutex
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running bool
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closed chan bool
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err error
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updated time.Time
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// output for logs
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output io.Writer
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// service to manage
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*Service
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// process creator
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Process *proc.Process
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// Exec
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Exec *process.Executable
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// process pid
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PID *process.PID
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}
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func newService(s *Service, c CreateOptions) *service {
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var exec string
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var args []string
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// set command
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exec = c.Command[0]
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// set args
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if len(c.Command) > 1 {
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args = c.Command[1:]
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}
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return &service{
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Service: s,
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Process: new(proc.Process),
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Exec: &process.Executable{
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Package: &build.Package{
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Name: s.Name,
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Path: exec,
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},
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Env: c.Env,
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Args: args,
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},
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closed: make(chan bool),
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output: c.Output,
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updated: time.Now(),
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}
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}
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func (s *service) streamOutput() {
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go io.Copy(s.output, s.PID.Output)
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go io.Copy(s.output, s.PID.Error)
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}
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// Running returns true is the service is running
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func (s *service) Running() bool {
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s.RLock()
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defer s.RUnlock()
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return s.running
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}
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// Start stars the service
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func (s *service) Start() error {
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s.Lock()
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defer s.Unlock()
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if s.running {
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return nil
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}
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// reset
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s.err = nil
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s.closed = make(chan bool)
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// TODO: pull source & build binary
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log.Debugf("Runtime service %s forking new process", s.Service.Name)
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p, err := s.Process.Fork(s.Exec)
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if err != nil {
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return err
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}
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// set the pid
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s.PID = p
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// set to running
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s.running = true
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if s.output != nil {
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s.streamOutput()
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}
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// wait and watch
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go s.Wait()
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return nil
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}
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// Stop stops the service
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func (s *service) Stop() error {
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s.Lock()
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defer s.Unlock()
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select {
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case <-s.closed:
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return nil
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default:
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close(s.closed)
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s.running = false
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if s.PID == nil {
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return nil
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}
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// kill the process
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err := s.Process.Kill(s.PID)
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// wait for it to exit
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s.Process.Wait(s.PID)
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// return the kill error
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return err
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}
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}
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// Error returns the last error service has returned
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func (s *service) Error() error {
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s.RLock()
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defer s.RUnlock()
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return s.err
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}
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// Wait waits for the service to finish running
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func (s *service) Wait() {
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// wait for process to exit
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err := s.Process.Wait(s.PID)
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s.Lock()
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defer s.Unlock()
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// save the error
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if err != nil {
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s.err = err
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}
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// no longer running
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s.running = false
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}
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