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moby--moby/pkg/discovery/discovery.go
Arnaud Porterie 166e082be3 Add pkg/discovery for nodes discovery
Absorb Swarm's discovery package in order to provide a common node
discovery mechanism to be used by both Swarm and networking code.

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>
2015-09-25 13:33:23 -07:00

35 lines
1 KiB
Go

package discovery
import (
"errors"
"time"
)
var (
// ErrNotSupported is returned when a discovery service is not supported.
ErrNotSupported = errors.New("discovery service not supported")
// ErrNotImplemented is returned when discovery feature is not implemented
// by discovery backend.
ErrNotImplemented = errors.New("not implemented in this discovery service")
)
// Watcher provides watching over a cluster for nodes joining and leaving.
type Watcher interface {
// Watch the discovery for entry changes.
// Returns a channel that will receive changes or an error.
// Providing a non-nil stopCh can be used to stop watching.
Watch(stopCh <-chan struct{}) (<-chan Entries, <-chan error)
}
// Backend is implemented by discovery backends which manage cluster entries.
type Backend interface {
// Watcher must be provided by every backend.
Watcher
// Initialize the discovery with URIs, a heartbeat and a ttl.
Initialize(string, time.Duration, time.Duration) error
// Register to the discovery.
Register(string) error
}