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moby--moby/plugin/manager.go
Anusha Ragunathan 17b8aba1d9 Adding pluginv2 support for libnetwork (part 1)
Legacy plugins (aka pluginv1) calls in libnetwork are replaced with
calls using the new plugin model (aka pluginv2). pkg/plugins is still
used for managing the http client connections to the plugin.

This commit makes the necessary changes in docker/docker. Part 2 will
will take care of the libnetwork changes.

Signed-off-by: Anusha Ragunathan <anusha@docker.com>
2016-09-06 14:30:55 -07:00

170 lines
3.7 KiB
Go

// +build experimental
package plugin
import (
"encoding/json"
"io"
"os"
"path/filepath"
"sync"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/libcontainerd"
"github.com/docker/docker/plugin/store"
"github.com/docker/docker/plugin/v2"
"github.com/docker/docker/registry"
)
var (
manager *Manager
)
func (pm *Manager) restorePlugin(p *v2.Plugin) error {
p.RuntimeSourcePath = filepath.Join(pm.runRoot, p.GetID())
if p.IsEnabled() {
return pm.restore(p)
}
return nil
}
type eventLogger func(id, name, action string)
// Manager controls the plugin subsystem.
type Manager struct {
sync.RWMutex
libRoot string
runRoot string
pluginStore *store.PluginStore
containerdClient libcontainerd.Client
registryService registry.Service
liveRestore bool
shutdown bool
pluginEventLogger eventLogger
}
// GetManager returns the singleton plugin Manager
func GetManager() *Manager {
return manager
}
// Init (was NewManager) instantiates the singleton Manager.
// TODO: revert this to NewManager once we get rid of all the singletons.
func Init(root string, remote libcontainerd.Remote, rs registry.Service, liveRestore bool, evL eventLogger) (err error) {
if manager != nil {
return nil
}
root = filepath.Join(root, "plugins")
manager = &Manager{
libRoot: root,
runRoot: "/run/docker",
pluginStore: store.NewPluginStore(root),
registryService: rs,
liveRestore: liveRestore,
pluginEventLogger: evL,
}
if err := os.MkdirAll(manager.runRoot, 0700); err != nil {
return err
}
manager.containerdClient, err = remote.Client(manager)
if err != nil {
return err
}
if err := manager.init(); err != nil {
return err
}
return nil
}
// StateChanged updates plugin internals using libcontainerd events.
func (pm *Manager) StateChanged(id string, e libcontainerd.StateInfo) error {
logrus.Debugf("plugin state changed %s %#v", id, e)
switch e.State {
case libcontainerd.StateExit:
var shutdown bool
pm.RLock()
shutdown = pm.shutdown
pm.RUnlock()
if shutdown {
p, err := pm.pluginStore.GetByID(id)
if err != nil {
return err
}
close(p.ExitChan)
}
}
return nil
}
// AttachStreams attaches io streams to the plugin
func (pm *Manager) AttachStreams(id string, iop libcontainerd.IOPipe) error {
iop.Stdin.Close()
logger := logrus.New()
logger.Hooks.Add(logHook{id})
// TODO: cache writer per id
w := logger.Writer()
go func() {
io.Copy(w, iop.Stdout)
}()
go func() {
// TODO: update logrus and use logger.WriterLevel
io.Copy(w, iop.Stderr)
}()
return nil
}
func (pm *Manager) init() error {
dt, err := os.Open(filepath.Join(pm.libRoot, "plugins.json"))
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer dt.Close()
plugins := make(map[string]*v2.Plugin)
if err := json.NewDecoder(dt).Decode(&plugins); err != nil {
return err
}
pm.pluginStore.SetAll(plugins)
var group sync.WaitGroup
group.Add(len(plugins))
for _, p := range plugins {
go func(p *v2.Plugin) {
defer group.Done()
if err := pm.restorePlugin(p); err != nil {
logrus.Errorf("failed to restore plugin '%s': %s", p.Name(), err)
return
}
pm.pluginStore.Add(p)
requiresManualRestore := !pm.liveRestore && p.IsEnabled()
if requiresManualRestore {
// if liveRestore is not enabled, the plugin will be stopped now so we should enable it
if err := pm.enable(p, true); err != nil {
logrus.Errorf("failed to enable plugin '%s': %s", p.Name(), err)
}
}
}(p)
}
group.Wait()
return nil
}
type logHook struct{ id string }
func (logHook) Levels() []logrus.Level {
return logrus.AllLevels
}
func (l logHook) Fire(entry *logrus.Entry) error {
entry.Data = logrus.Fields{"plugin": l.id}
return nil
}