151 lines
3.0 KiB
Go
151 lines
3.0 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package client
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"runtime"
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"sync"
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"syscall"
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"time"
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. "github.com/containerd/containerd"
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exec "golang.org/x/sys/execabs"
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)
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type daemon struct {
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sync.Mutex
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addr string
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cmd *exec.Cmd
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}
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func (d *daemon) start(name, address string, args []string, stdout, stderr io.Writer) error {
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d.Lock()
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defer d.Unlock()
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if d.cmd != nil {
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return errors.New("daemon is already running")
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}
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args = append(args, []string{"--address", address}...)
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cmd := exec.Command(name, args...)
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cmd.Stdout = stdout
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cmd.Stderr = stderr
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if err := cmd.Start(); err != nil {
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cmd.Wait()
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return fmt.Errorf("failed to start daemon: %w", err)
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}
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d.addr = address
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d.cmd = cmd
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return nil
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}
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func (d *daemon) waitForStart(ctx context.Context) (*Client, error) {
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var (
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client *Client
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serving bool
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err error
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ticker = time.NewTicker(500 * time.Millisecond)
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)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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client, err = New(d.addr)
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if err != nil {
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continue
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}
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serving, err = client.IsServing(ctx)
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if !serving {
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client.Close()
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if err == nil {
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err = errors.New("connection was successful but service is not available")
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}
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continue
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}
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return client, err
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case <-ctx.Done():
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return nil, fmt.Errorf("context deadline exceeded: %w", err)
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}
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}
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}
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func (d *daemon) Stop() error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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return d.cmd.Process.Signal(syscall.SIGTERM)
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}
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func (d *daemon) Kill() error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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return d.cmd.Process.Kill()
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}
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func (d *daemon) Wait() error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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err := d.cmd.Wait()
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d.cmd = nil
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return err
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}
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func (d *daemon) Restart(stopCb func()) error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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signal := syscall.SIGTERM
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if runtime.GOOS == "windows" {
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signal = syscall.SIGKILL
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}
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var err error
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if err = d.cmd.Process.Signal(signal); err != nil {
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return fmt.Errorf("failed to signal daemon: %w", err)
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}
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d.cmd.Wait()
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if stopCb != nil {
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stopCb()
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}
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cmd := exec.Command(d.cmd.Path, d.cmd.Args[1:]...)
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cmd.Stdout = d.cmd.Stdout
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cmd.Stderr = d.cmd.Stderr
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if err := cmd.Start(); err != nil {
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cmd.Wait()
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return fmt.Errorf("failed to start new daemon instance: %w", err)
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}
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d.cmd = cmd
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return nil
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}
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