/
informer.go
79 lines (68 loc) · 1.94 KB
/
informer.go
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// Copyright Red Hat / IBM
// Copyright Grafana Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This implementation is a derivation of the code in
// https://github.com/netobserv/netobserv-ebpf-agent/tree/release-1.4
package ifaces
import (
"context"
"fmt"
"log/slog"
"net"
)
// 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)
}
}
func ilog() *slog.Logger {
return slog.With("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
}
// 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}
}
return names, nil
}