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request.go
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request.go
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package servstate
import (
"fmt"
"github.com/canonical/pebble/internals/overlord/state"
)
// ServiceRequest holds the details required to perform service tasks.
type ServiceRequest struct {
Name string
}
// Start creates and returns a task set for starting the given services.
func Start(s *state.State, services []string) (*state.TaskSet, error) {
var tasks []*state.Task
for _, name := range services {
task := s.NewTask("start", fmt.Sprintf("Start service %q", name))
req := ServiceRequest{
Name: name,
}
task.Set("service-request", &req)
if len(tasks) > 0 {
// TODO Allow non-dependent services to start in parallel.
task.WaitFor(tasks[len(tasks)-1])
}
tasks = append(tasks, task)
}
return state.NewTaskSet(tasks...), nil
}
// Stop creates and returns a task set for stopping the given services.
func Stop(s *state.State, services []string) (*state.TaskSet, error) {
var tasks []*state.Task
for _, name := range services {
task := s.NewTask("stop", fmt.Sprintf("Stop service %q", name))
req := ServiceRequest{
Name: name,
}
task.Set("service-request", &req)
if len(tasks) > 1 {
// TODO Allow non-dependent services to stop in parallel.
task.WaitFor(tasks[len(tasks)-1])
}
tasks = append(tasks, task)
}
return state.NewTaskSet(tasks...), nil
}
// StopRunning creates and returns a task set for stopping all running
// services. It returns a nil *TaskSet if there are no services to stop.
func StopRunning(s *state.State, m *ServiceManager) (*state.TaskSet, error) {
services, err := servicesToStop(m)
if err != nil {
return nil, err
}
if len(services) == 0 {
return nil, nil
}
// One change to stop them all.
s.Lock()
defer s.Unlock()
taskSet, err := Stop(s, services)
if err != nil {
return nil, err
}
return taskSet, nil
}