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cluster.go
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cluster.go
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package swarm
import (
"crypto/tls"
"errors"
"fmt"
"io"
"sort"
"strings"
"sync"
log "github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/units"
"github.com/docker/swarm/cluster"
"github.com/docker/swarm/discovery"
"github.com/docker/swarm/scheduler"
"github.com/docker/swarm/scheduler/node"
"github.com/docker/swarm/state"
"github.com/samalba/dockerclient"
)
// Cluster is exported
type Cluster struct {
sync.RWMutex
eventHandler cluster.EventHandler
engines map[string]*cluster.Engine
scheduler *scheduler.Scheduler
store *state.Store
discovery discovery.Discovery
overcommitRatio float64
TLSConfig *tls.Config
}
// NewCluster is exported
func NewCluster(scheduler *scheduler.Scheduler, store *state.Store, TLSConfig *tls.Config, discovery discovery.Discovery, options cluster.DriverOpts) (cluster.Cluster, error) {
log.WithFields(log.Fields{"name": "swarm"}).Debug("Initializing cluster")
cluster := &Cluster{
engines: make(map[string]*cluster.Engine),
scheduler: scheduler,
store: store,
TLSConfig: TLSConfig,
discovery: discovery,
overcommitRatio: 0.05,
}
if val, ok := options.Float("swarm.overcommit", ""); ok {
cluster.overcommitRatio = val
}
discoveryCh, errCh := cluster.discovery.Watch(nil)
go cluster.monitorDiscovery(discoveryCh, errCh)
return cluster, nil
}
// Handle callbacks for the events
func (c *Cluster) Handle(e *cluster.Event) error {
if c.eventHandler == nil {
return nil
}
if err := c.eventHandler.Handle(e); err != nil {
log.Error(err)
}
return nil
}
// RegisterEventHandler registers an event handler.
func (c *Cluster) RegisterEventHandler(h cluster.EventHandler) error {
if c.eventHandler != nil {
return errors.New("event handler already set")
}
c.eventHandler = h
return nil
}
// Generate a globally (across the cluster) unique ID.
func (c *Cluster) generateUniqueID() string {
for {
id := stringid.GenerateRandomID()
if c.Container(id) == nil {
return id
}
}
}
// CreateContainer aka schedule a brand new container into the cluster.
func (c *Cluster) CreateContainer(config *cluster.ContainerConfig, name string) (*cluster.Container, error) {
c.scheduler.Lock()
defer c.scheduler.Unlock()
// Ensure the name is avaliable
if cID := c.getIDFromName(name); cID != "" {
return nil, fmt.Errorf("Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", name, cID, name)
}
// Associate a Swarm ID to the container we are creating.
config.SetSwarmID(c.generateUniqueID())
n, err := c.scheduler.SelectNodeForContainer(c.listNodes(), config)
if err != nil {
return nil, err
}
if nn, ok := c.engines[n.ID]; ok {
container, err := nn.Create(config, name, true)
if err != nil {
return nil, err
}
st := &state.RequestedState{
ID: container.Id,
Name: name,
Config: config,
}
return container, c.store.Add(container.Id, st)
}
return nil, nil
}
// RemoveContainer aka Remove a container from the cluster. Containers should
// always be destroyed through the scheduler to guarantee atomicity.
func (c *Cluster) RemoveContainer(container *cluster.Container, force bool) error {
c.scheduler.Lock()
defer c.scheduler.Unlock()
if err := container.Engine.RemoveContainer(container, force); err != nil {
return err
}
if err := c.store.Remove(container.Id); err != nil {
if err == state.ErrNotFound {
log.Debugf("Container %s not found in the store", container.Id)
return nil
}
return err
}
return nil
}
func (c *Cluster) getEngineByAddr(addr string) *cluster.Engine {
c.RLock()
defer c.RUnlock()
for _, engine := range c.engines {
if engine.Addr == addr {
return engine
}
}
return nil
}
func (c *Cluster) hasEngineByAddr(addr string) bool {
return c.getEngineByAddr(addr) != nil
}
func (c *Cluster) addEngine(addr string) bool {
// Check the engine is already registered by address.
if c.hasEngineByAddr(addr) {
return false
}
// Attempt a connection to the engine. Since this is slow, don't get a hold
// of the lock yet.
engine := cluster.NewEngine(addr, c.overcommitRatio)
if err := engine.Connect(c.TLSConfig); err != nil {
log.Error(err)
return false
}
// The following is critical and fast. Grab a lock.
c.Lock()
defer c.Unlock()
// Make sure the engine ID is unique.
if old, exists := c.engines[engine.ID]; exists {
if old.Addr != engine.Addr {
log.Errorf("ID duplicated. %s shared by %s and %s", engine.ID, old.Addr, engine.Addr)
} else {
log.Debugf("node %q (name: %q) with address %q is already registered", engine.ID, engine.Name, engine.Addr)
}
return false
}
// Finally register the engine.
c.engines[engine.ID] = engine
if err := engine.RegisterEventHandler(c); err != nil {
log.Error(err)
}
log.Infof("Registered Engine %s at %s", engine.Name, addr)
return true
}
func (c *Cluster) removeEngine(addr string) bool {
engine := c.getEngineByAddr(addr)
if engine == nil {
return false
}
c.Lock()
defer c.Unlock()
engine.Disconnect()
delete(c.engines, engine.ID)
log.Infof("Removed Engine %s", engine.Name)
return true
}
// Entries are Docker Engines
func (c *Cluster) monitorDiscovery(ch <-chan discovery.Entries, errCh <-chan error) {
// Watch changes on the discovery channel.
currentEntries := discovery.Entries{}
for {
select {
case entries := <-ch:
added, removed := currentEntries.Diff(entries)
currentEntries = entries
// Remove engines first. `addEngine` will refuse to add an engine
// if there's already an engine with the same ID. If an engine
// changes address, we have to first remove it then add it back.
for _, entry := range removed {
c.removeEngine(entry.String())
}
// Since `addEngine` can be very slow (it has to connect to the
// engine), we are going to do the adds in parallel.
for _, entry := range added {
go c.addEngine(entry.String())
}
case err := <-errCh:
log.Errorf("Discovery error: %v", err)
}
}
}
// Images returns all the images in the cluster.
func (c *Cluster) Images() []*cluster.Image {
c.RLock()
defer c.RUnlock()
out := []*cluster.Image{}
for _, n := range c.engines {
out = append(out, n.Images()...)
}
return out
}
// Image returns an image with IDOrName in the cluster
func (c *Cluster) Image(IDOrName string) *cluster.Image {
// Abort immediately if the name is empty.
if len(IDOrName) == 0 {
return nil
}
c.RLock()
defer c.RUnlock()
for _, n := range c.engines {
if image := n.Image(IDOrName); image != nil {
return image
}
}
return nil
}
// RemoveImages removes all the images that match `name` from the cluster
func (c *Cluster) RemoveImages(name string) ([]*dockerclient.ImageDelete, error) {
c.Lock()
defer c.Unlock()
out := []*dockerclient.ImageDelete{}
errs := []string{}
var err error
for _, n := range c.engines {
for _, image := range n.Images() {
if image.Match(name, true) {
content, err := image.Engine.RemoveImage(image, name)
if err != nil {
errs = append(errs, fmt.Sprintf("%s: %s", image.Engine.Name, err.Error()))
continue
}
out = append(out, content...)
}
}
}
if len(errs) > 0 {
err = errors.New(strings.Join(errs, "\n"))
}
return out, err
}
// Pull is exported
func (c *Cluster) Pull(name string, authConfig *dockerclient.AuthConfig, callback func(what, status string)) {
var wg sync.WaitGroup
c.RLock()
for _, n := range c.engines {
wg.Add(1)
go func(nn *cluster.Engine) {
defer wg.Done()
if callback != nil {
callback(nn.Name, "")
}
err := nn.Pull(name, authConfig)
if callback != nil {
if err != nil {
callback(nn.Name, err.Error())
} else {
callback(nn.Name, "downloaded")
}
}
}(n)
}
c.RUnlock()
wg.Wait()
}
// Load image
func (c *Cluster) Load(imageReader io.Reader, callback func(what, status string)) {
var wg sync.WaitGroup
c.RLock()
pipeWriters := []*io.PipeWriter{}
pipeReaders := []*io.PipeReader{}
for _, n := range c.engines {
wg.Add(1)
pipeReader, pipeWriter := io.Pipe()
pipeReaders = append(pipeReaders, pipeReader)
pipeWriters = append(pipeWriters, pipeWriter)
go func(reader *io.PipeReader, nn *cluster.Engine) {
defer wg.Done()
defer reader.Close()
// call engine load image
err := nn.Load(reader)
if callback != nil {
if err != nil {
callback(nn.Name, err.Error())
}
}
}(pipeReader, n)
}
// create multi-writer
listWriter := []io.Writer{}
for _, pipeW := range pipeWriters {
listWriter = append(listWriter, pipeW)
}
mutiWriter := io.MultiWriter(listWriter...)
// copy image-reader to muti-writer
_, err := io.Copy(mutiWriter, imageReader)
if err != nil {
log.Error(err)
}
// close pipe writers
for _, pipeW := range pipeWriters {
pipeW.Close()
}
c.RUnlock()
wg.Wait()
}
// Import image
func (c *Cluster) Import(source string, repository string, tag string, imageReader io.Reader, callback func(what, status string)) {
var wg sync.WaitGroup
c.RLock()
pipeWriters := []*io.PipeWriter{}
for _, n := range c.engines {
wg.Add(1)
pipeReader, pipeWriter := io.Pipe()
pipeWriters = append(pipeWriters, pipeWriter)
go func(reader *io.PipeReader, nn *cluster.Engine) {
defer wg.Done()
defer reader.Close()
// call engine import
err := nn.Import(source, repository, tag, reader)
if callback != nil {
if err != nil {
callback(nn.Name, err.Error())
} else {
callback(nn.Name, "Import success")
}
}
}(pipeReader, n)
}
c.RUnlock()
// create multi-writer
listWriter := []io.Writer{}
for _, pipeW := range pipeWriters {
listWriter = append(listWriter, pipeW)
}
multiWriter := io.MultiWriter(listWriter...)
// copy image-reader to muti-writer
_, err := io.Copy(multiWriter, imageReader)
if err != nil {
log.Error(err)
}
// close pipe writers
for _, pipeW := range pipeWriters {
pipeW.Close()
}
wg.Wait()
}
// Containers returns all the containers in the cluster.
func (c *Cluster) Containers() cluster.Containers {
c.RLock()
defer c.RUnlock()
out := cluster.Containers{}
for _, n := range c.engines {
out = append(out, n.Containers()...)
}
return out
}
func (c *Cluster) getIDFromName(name string) string {
// Abort immediately if the name is empty.
if len(name) == 0 {
return ""
}
c.RLock()
defer c.RUnlock()
for _, n := range c.engines {
for _, c := range n.Containers() {
for _, cname := range c.Names {
if cname == name || cname == "/"+name {
return c.Id
}
}
}
}
return ""
}
// Container returns the container with IDOrName in the cluster
func (c *Cluster) Container(IDOrName string) *cluster.Container {
// Abort immediately if the name is empty.
if len(IDOrName) == 0 {
return nil
}
c.RLock()
defer c.RUnlock()
return cluster.Containers(c.Containers()).Get(IDOrName)
}
// listNodes returns all the engines in the cluster.
func (c *Cluster) listNodes() []*node.Node {
c.RLock()
defer c.RUnlock()
out := make([]*node.Node, 0, len(c.engines))
for _, n := range c.engines {
out = append(out, node.NewNode(n))
}
return out
}
// listEngines returns all the engines in the cluster.
func (c *Cluster) listEngines() []*cluster.Engine {
c.RLock()
defer c.RUnlock()
out := make([]*cluster.Engine, 0, len(c.engines))
for _, n := range c.engines {
out = append(out, n)
}
return out
}
// Info is exported
func (c *Cluster) Info() [][2]string {
info := [][2]string{
{"\bStrategy", c.scheduler.Strategy()},
{"\bFilters", c.scheduler.Filters()},
{"\bNodes", fmt.Sprintf("%d", len(c.engines))},
}
engines := c.listEngines()
sort.Sort(cluster.EngineSorter(engines))
for _, engine := range engines {
info = append(info, [2]string{engine.Name, engine.Addr})
info = append(info, [2]string{" └ Containers", fmt.Sprintf("%d", len(engine.Containers()))})
info = append(info, [2]string{" └ Reserved CPUs", fmt.Sprintf("%d / %d", engine.UsedCpus(), engine.TotalCpus())})
info = append(info, [2]string{" └ Reserved Memory", fmt.Sprintf("%s / %s", units.BytesSize(float64(engine.UsedMemory())), units.BytesSize(float64(engine.TotalMemory())))})
labels := make([]string, 0, len(engine.Labels))
for k, v := range engine.Labels {
labels = append(labels, k+"="+v)
}
sort.Strings(labels)
info = append(info, [2]string{" └ Labels", fmt.Sprintf("%s", strings.Join(labels, ", "))})
}
return info
}
// RANDOMENGINE returns a random engine.
func (c *Cluster) RANDOMENGINE() (*cluster.Engine, error) {
n, err := c.scheduler.SelectNodeForContainer(c.listNodes(), &cluster.ContainerConfig{})
if err != nil {
return nil, err
}
if n != nil {
return c.engines[n.ID], nil
}
return nil, nil
}
// RenameContainer rename a container
func (c *Cluster) RenameContainer(container *cluster.Container, newName string) error {
c.RLock()
defer c.RUnlock()
// check new name whether avaliable
if cID := c.getIDFromName(newName); cID != "" {
return fmt.Errorf("Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", newName, cID, newName)
}
// call engine rename
err := container.Engine.RenameContainer(container, newName)
if err != nil {
return err
}
// update container name in store
st, err := c.store.Get(container.Id)
if err != nil {
return err
}
st.Name = newName
return c.store.Replace(container.Id, st)
}