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nodes.go
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nodes.go
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package dispatcher
import (
"sync"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/identity"
"github.com/docker/swarmkit/manager/dispatcher/heartbeat"
)
type registeredNode struct {
SessionID string
Heartbeat *heartbeat.Heartbeat
Node *api.Node
Disconnect chan struct{} // signal to disconnect
mu sync.Mutex
}
// checkSessionID determines if the SessionID has changed and returns the
// appropriate GRPC error code.
//
// This may not belong here in the future.
func (rn *registeredNode) checkSessionID(sessionID string) error {
rn.mu.Lock()
defer rn.mu.Unlock()
// Before each message send, we need to check the nodes sessionID hasn't
// changed. If it has, we will the stream and make the node
// re-register.
if sessionID == "" || rn.SessionID != sessionID {
return grpc.Errorf(codes.InvalidArgument, ErrSessionInvalid.Error())
}
return nil
}
type nodeStore struct {
periodChooser *periodChooser
gracePeriodMultiplier time.Duration
nodes map[string]*registeredNode
mu sync.RWMutex
}
func newNodeStore(hbPeriod, hbEpsilon time.Duration, graceMultiplier int) *nodeStore {
return &nodeStore{
nodes: make(map[string]*registeredNode),
periodChooser: newPeriodChooser(hbPeriod, hbEpsilon),
gracePeriodMultiplier: time.Duration(graceMultiplier),
}
}
func (s *nodeStore) updatePeriod(hbPeriod, hbEpsilon time.Duration, gracePeriodMultiplier int) {
s.mu.Lock()
s.periodChooser = newPeriodChooser(hbPeriod, hbEpsilon)
s.gracePeriodMultiplier = time.Duration(gracePeriodMultiplier)
s.mu.Unlock()
}
func (s *nodeStore) Len() int {
s.mu.Lock()
defer s.mu.Unlock()
return len(s.nodes)
}
func (s *nodeStore) AddUnknown(n *api.Node, expireFunc func()) error {
s.mu.Lock()
defer s.mu.Unlock()
rn := ®isteredNode{
Node: n,
}
s.nodes[n.ID] = rn
rn.Heartbeat = heartbeat.New(s.periodChooser.Choose()*s.gracePeriodMultiplier, expireFunc)
return nil
}
// Add adds new node and returns it, it replaces existing without notification.
func (s *nodeStore) Add(n *api.Node, expireFunc func()) *registeredNode {
s.mu.Lock()
defer s.mu.Unlock()
if existRn, ok := s.nodes[n.ID]; ok {
existRn.Heartbeat.Stop()
delete(s.nodes, n.ID)
}
rn := ®isteredNode{
SessionID: identity.NewID(), // session ID is local to the dispatcher.
Node: n,
Disconnect: make(chan struct{}),
}
s.nodes[n.ID] = rn
rn.Heartbeat = heartbeat.New(s.periodChooser.Choose()*s.gracePeriodMultiplier, expireFunc)
return rn
}
func (s *nodeStore) Get(id string) (*registeredNode, error) {
s.mu.RLock()
rn, ok := s.nodes[id]
s.mu.RUnlock()
if !ok {
return nil, grpc.Errorf(codes.NotFound, ErrNodeNotRegistered.Error())
}
return rn, nil
}
func (s *nodeStore) GetWithSession(id, sid string) (*registeredNode, error) {
s.mu.RLock()
rn, ok := s.nodes[id]
s.mu.RUnlock()
if !ok {
return nil, grpc.Errorf(codes.NotFound, ErrNodeNotRegistered.Error())
}
return rn, rn.checkSessionID(sid)
}
func (s *nodeStore) Heartbeat(id, sid string) (time.Duration, error) {
rn, err := s.GetWithSession(id, sid)
if err != nil {
return 0, err
}
period := s.periodChooser.Choose() // base period for node
grace := period * time.Duration(s.gracePeriodMultiplier)
rn.mu.Lock()
rn.Heartbeat.Update(grace)
rn.Heartbeat.Beat()
rn.mu.Unlock()
return period, nil
}
func (s *nodeStore) Delete(id string) *registeredNode {
s.mu.Lock()
var node *registeredNode
if rn, ok := s.nodes[id]; ok {
delete(s.nodes, id)
rn.Heartbeat.Stop()
node = rn
}
s.mu.Unlock()
return node
}
func (s *nodeStore) Disconnect(id string) {
s.mu.Lock()
if rn, ok := s.nodes[id]; ok {
close(rn.Disconnect)
rn.Heartbeat.Stop()
}
s.mu.Unlock()
}
// Clean removes all nodes and stops their heartbeats.
// It's equivalent to invalidate all sessions.
func (s *nodeStore) Clean() {
s.mu.Lock()
for _, rn := range s.nodes {
rn.Heartbeat.Stop()
}
s.nodes = make(map[string]*registeredNode)
s.mu.Unlock()
}