package runtime import ( "fmt" "io" "strconv" "strings" "sync" "time" "github.com/micro/go-micro/v2/logger" "github.com/micro/go-micro/v2/runtime/local/build" "github.com/micro/go-micro/v2/runtime/local/process" proc "github.com/micro/go-micro/v2/runtime/local/process/os" ) type service struct { sync.RWMutex running bool closed chan bool err error updated time.Time retries int maxRetries int // output for logs output io.Writer // service to manage *Service // process creator Process *proc.Process // Exec Exec *process.Executable // process pid PID *process.PID } func newService(s *Service, c CreateOptions) *service { var exec string var args []string // set command exec = strings.Join(c.Command, " ") args = c.Args return &service{ Service: s, Process: new(proc.Process), Exec: &process.Executable{ Package: &build.Package{ Name: s.Name, Path: exec, }, Env: c.Env, Args: args, Dir: s.Source, }, closed: make(chan bool), output: c.Output, updated: time.Now(), maxRetries: c.Retries, } } func (s *service) streamOutput() { go io.Copy(s.output, s.PID.Output) go io.Copy(s.output, s.PID.Error) } func (s *service) shouldStart() bool { if s.running { return false } return s.retries <= s.maxRetries } func (s *service) key() string { return fmt.Sprintf("%v:%v", s.Name, s.Version) } func (s *service) ShouldStart() bool { s.RLock() defer s.RUnlock() return s.shouldStart() } func (s *service) Running() bool { s.RLock() defer s.RUnlock() return s.running } // Start starts the service func (s *service) Start() error { s.Lock() defer s.Unlock() if !s.shouldStart() { return nil } // reset s.err = nil s.closed = make(chan bool) s.retries = 0 if s.Metadata == nil { s.Metadata = make(map[string]string) } s.Status("starting", nil) // TODO: pull source & build binary if logger.V(logger.DebugLevel, logger.DefaultLogger) { logger.Debugf("Runtime service %s forking new process", s.Service.Name) } p, err := s.Process.Fork(s.Exec) if err != nil { s.Status("error", err) return err } // set the pid s.PID = p // set to running s.running = true // set status s.Status("running", nil) // set started s.Metadata["started"] = time.Now().Format(time.RFC3339) if s.output != nil { s.streamOutput() } // wait and watch go s.Wait() return nil } // Status updates the status of the service. Assumes it's called under a lock as it mutates state func (s *service) Status(status string, err error) { s.Metadata["lastStatusUpdate"] = time.Now().Format(time.RFC3339) s.Metadata["status"] = status if err == nil { delete(s.Metadata, "error") return } s.Metadata["error"] = err.Error() } // Stop stops the service func (s *service) Stop() error { s.Lock() defer s.Unlock() select { case <-s.closed: return nil default: close(s.closed) s.running = false s.retries = 0 if s.PID == nil { return nil } // set status s.Status("stopping", nil) // kill the process err := s.Process.Kill(s.PID) if err == nil { // wait for it to exit s.Process.Wait(s.PID) } // set status s.Status("stopped", err) // return the kill error return err } } // Error returns the last error service has returned func (s *service) Error() error { s.RLock() defer s.RUnlock() return s.err } // Wait waits for the service to finish running func (s *service) Wait() { // wait for process to exit s.RLock() thisPID := s.PID s.RUnlock() err := s.Process.Wait(thisPID) s.Lock() defer s.Unlock() if s.PID.ID != thisPID.ID { // trying to update when it's already been switched out, ignore logger.Warnf("Trying to update a process status but PID doesn't match. Old %s, New %s. Skipping update.", thisPID.ID, s.PID.ID) return } // save the error if err != nil { if logger.V(logger.ErrorLevel, logger.DefaultLogger) { logger.Errorf("Service %s terminated with error %s", s.Name, err) } s.retries++ s.Status("error", err) s.Metadata["retries"] = strconv.Itoa(s.retries) s.err = err } else { s.Status("done", nil) } // no longer running s.running = false }