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informer.go
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/
informer.go
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package ifaces
import (
"context"
"fmt"
"net"
"github.com/sirupsen/logrus"
"github.com/vishvananda/netns"
)
// EventType for an interface: added, deleted
type EventType int
const (
EventAdded EventType = iota
EventDeleted
)
func (e EventType) String() string {
switch e {
case EventAdded:
return "Added"
case EventDeleted:
return "Deleted"
default:
return fmt.Sprintf("Unknown (%d)", e)
}
}
var ilog = logrus.WithField("component", "ifaces.Informer")
// Event of a network interface, given the type (added, removed) and the interface name
type Event struct {
Type EventType
Interface Interface
}
type Interface struct {
Name string
Index int
NetNS netns.NsHandle
}
// Informer provides notifications about each network interface that is added or removed
// from the host. Production implementations: Poller and Watcher.
type Informer interface {
// Subscribe returns a channel that sends Event instances.
Subscribe(ctx context.Context) (<-chan Event, error)
}
func netInterfaces() ([]Interface, error) {
ifs, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("can't fetch interfaces: %w", err)
}
names := make([]Interface, len(ifs))
for i, ifc := range ifs {
names[i] = Interface{Name: ifc.Name, Index: ifc.Index, NetNS: netns.None()}
}
return names, nil
}