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// SPDX-License-Identifier: GPL-3.0-or-later
package netlisteners
import (
"context"
"errors"
"slices"
"sort"
"strings"
"sync"
"testing"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type listenersCli interface {
addListener(s string)
removeListener(s string)
}
type discoverySim struct {
listenersCli func(cli listenersCli, interval, expiry time.Duration)
wantGroups []model.TargetGroup
}
func (sim *discoverySim) run(t *testing.T) {
d, err := NewDiscoverer(Config{
Source: "",
Tags: "netlisteners",
})
require.NoError(t, err)
mock := newMockLocalListenersExec()
d.ll = mock
d.interval = time.Millisecond * 100
d.expiryTime = time.Second * 1
seen := make(map[string]model.TargetGroup)
ctx, cancel := context.WithCancel(context.Background())
in := make(chan []model.TargetGroup)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
d.Discover(ctx, in)
}()
wg.Add(1)
go func() {
defer wg.Done()
for {
select {
case <-ctx.Done():
return
case tggs := <-in:
for _, tgg := range tggs {
seen[tgg.Source()] = tgg
}
}
}
}()
done := make(chan struct{})
go func() {
defer close(done)
wg.Wait()
}()
select {
case <-d.started:
case <-time.After(time.Second * 3):
require.Fail(t, "discovery failed to start")
}
sim.listenersCli(mock, d.interval, d.expiryTime)
cancel()
select {
case <-done:
case <-time.After(time.Second * 3):
require.Fail(t, "discovery hasn't finished after cancel")
}
var tggs []model.TargetGroup
for _, tgg := range seen {
tggs = append(tggs, tgg)
}
sortTargetGroups(tggs)
sortTargetGroups(sim.wantGroups)
wantLen, gotLen := calcTargets(sim.wantGroups), calcTargets(tggs)
assert.Equalf(t, wantLen, gotLen, "different len (want %d got %d)", wantLen, gotLen)
assert.Equal(t, sim.wantGroups, tggs)
}
func newMockLocalListenersExec() *mockLocalListenersExec {
return &mockLocalListenersExec{}
}
type mockLocalListenersExec struct {
errResponse bool
mux sync.Mutex
listeners []string
}
func (m *mockLocalListenersExec) addListener(s string) {
m.mux.Lock()
defer m.mux.Unlock()
m.listeners = append(m.listeners, s)
}
func (m *mockLocalListenersExec) removeListener(s string) {
m.mux.Lock()
defer m.mux.Unlock()
if i := slices.Index(m.listeners, s); i != -1 {
m.listeners = append(m.listeners[:i], m.listeners[i+1:]...)
}
}
func (m *mockLocalListenersExec) discover(context.Context) ([]byte, error) {
if m.errResponse {
return nil, errors.New("mock discover() error")
}
m.mux.Lock()
defer m.mux.Unlock()
var buf strings.Builder
for _, s := range m.listeners {
buf.WriteString(s)
buf.WriteByte('\n')
}
return []byte(buf.String()), nil
}
func calcTargets(tggs []model.TargetGroup) int {
var n int
for _, tgg := range tggs {
n += len(tgg.Targets())
}
return n
}
func sortTargetGroups(tggs []model.TargetGroup) {
if len(tggs) == 0 {
return
}
sort.Slice(tggs, func(i, j int) bool { return tggs[i].Source() < tggs[j].Source() })
for idx := range tggs {
tgts := tggs[idx].Targets()
sort.Slice(tgts, func(i, j int) bool { return tgts[i].Hash() < tgts[j].Hash() })
}
}
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