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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package containerd
import (
"context"
"io"
"os/exec"
"sync"
"syscall"
"github.com/pkg/errors"
)
type daemon struct {
sync.Mutex
addr string
cmd *exec.Cmd
}
func (d *daemon) start(name, address string, args []string, stdout, stderr io.Writer) error {
d.Lock()
defer d.Unlock()
if d.cmd != nil {
return errors.New("daemon is already running")
}
args = append(args, []string{"--address", address}...)
cmd := exec.Command(name, args...)
cmd.Stdout = stdout
cmd.Stderr = stderr
if err := cmd.Start(); err != nil {
cmd.Wait()
return errors.Wrap(err, "failed to start daemon")
}
d.addr = address
d.cmd = cmd
return nil
}
func (d *daemon) waitForStart(ctx context.Context) (*Client, error) {
var (
client *Client
serving bool
err error
)
client, err = New(d.addr)
if err != nil {
return nil, err
}
serving, err = client.IsServing(ctx)
if !serving {
client.Close()
if err == nil {
err = errors.New("connection was successful but service is not available")
}
return nil, err
}
return client, err
}
func (d *daemon) Stop() error {
d.Lock()
defer d.Unlock()
if d.cmd == nil {
return errors.New("daemon is not running")
}
return d.cmd.Process.Signal(syscall.SIGTERM)
}
func (d *daemon) Kill() error {
d.Lock()
defer d.Unlock()
if d.cmd == nil {
return errors.New("daemon is not running")
}
return d.cmd.Process.Kill()
}
func (d *daemon) Wait() error {
d.Lock()
defer d.Unlock()
if d.cmd == nil {
return errors.New("daemon is not running")
}
err := d.cmd.Wait()
d.cmd = nil
return err
}
func (d *daemon) Restart(stopCb func()) error {
d.Lock()
defer d.Unlock()
if d.cmd == nil {
return errors.New("daemon is not running")
}
var err error
if err = d.cmd.Process.Signal(syscall.SIGTERM); err != nil {
return errors.Wrap(err, "failed to signal daemon")
}
d.cmd.Wait()
if stopCb != nil {
stopCb()
}
cmd := exec.Command(d.cmd.Path, d.cmd.Args[1:]...)
cmd.Stdout = d.cmd.Stdout
cmd.Stderr = d.cmd.Stderr
if err := cmd.Start(); err != nil {
cmd.Wait()
return errors.Wrap(err, "failed to start new daemon instance")
}
d.cmd = cmd
return nil
}
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