[release/0.11] Adding state attribute to the HNSEndpoint struct to support hyperv co…

internal/hns/hnsendpoint.go

@@ -10,6 +10,28 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+// EndpointState represents the states of an HNS Endpoint lifecycle.
+type EndpointState uint16
+
+// EndpointState const
+// The lifecycle of an Endpoint goes through created, attached, AttachedSharing - endpoint is being shared with other containers,
+// detached, after being attached, degraded and finally destroyed.
+// Note: This attribute is used by calico to define stale containers and is dependent on HNS v1 api, if we move to HNS v2 api we will need
+// to update the current calico code and cordinate the change with calico. Reach out to Microsoft to facilate the change via HNS.
+const (
+	Uninitialized   EndpointState = iota
+	Created         EndpointState = 1
+	Attached        EndpointState = 2
+	AttachedSharing EndpointState = 3
+	Detached        EndpointState = 4
+	Degraded        EndpointState = 5
+	Destroyed       EndpointState = 6
+)
+
+func (es EndpointState) String() string {
+	return [...]string{"Uninitialized", "Attached", "AttachedSharing", "Detached", "Degraded", "Destroyed"}[es]
+}
+
 // HNSEndpoint represents a network endpoint in HNS
 type HNSEndpoint struct {
 	Id                 string            `json:"ID,omitempty"`
@@ -34,6 +56,7 @@ type HNSEndpoint struct {
 	Namespace          *Namespace        `json:",omitempty"`
 	EncapOverhead      uint16            `json:",omitempty"`
 	SharedContainers   []string          `json:",omitempty"`
+	State              EndpointState     `json:",omitempty"`
 }
 
 // SystemType represents the type of the system on which actions are done