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// SPDX-License-Identifier: GPL-3.0-or-later
package pipeline
import (
"context"
"sync"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/netdata/netdata/go/go.d.plugin/logger"
)
func newAccumulator() *accumulator {
return &accumulator{
send: make(chan struct{}, 1),
sendEvery: time.Second * 2,
mux: &sync.Mutex{},
tggs: make(map[string]model.TargetGroup),
}
}
type accumulator struct {
*logger.Logger
discoverers []model.Discoverer
send chan struct{}
sendEvery time.Duration
mux *sync.Mutex
tggs map[string]model.TargetGroup
}
func (a *accumulator) run(ctx context.Context, in chan []model.TargetGroup) {
updates := make(chan []model.TargetGroup)
var wg sync.WaitGroup
for _, d := range a.discoverers {
wg.Add(1)
d := d
go func() { defer wg.Done(); a.runDiscoverer(ctx, d, updates) }()
}
done := make(chan struct{})
go func() { defer close(done); wg.Wait() }()
tk := time.NewTicker(a.sendEvery)
defer tk.Stop()
for {
select {
case <-ctx.Done():
select {
case <-done:
a.Info("all discoverers exited")
case <-time.After(time.Second * 3):
a.Warning("not all discoverers exited")
}
a.trySend(in)
return
case <-done:
if !isDone(ctx) {
a.Info("all discoverers exited before ctx done")
} else {
a.Info("all discoverers exited")
}
a.trySend(in)
return
case <-tk.C:
select {
case <-a.send:
a.trySend(in)
default:
}
}
}
}
func (a *accumulator) runDiscoverer(ctx context.Context, d model.Discoverer, updates chan []model.TargetGroup) {
done := make(chan struct{})
go func() { defer close(done); d.Discover(ctx, updates) }()
for {
select {
case <-ctx.Done():
select {
case <-done:
case <-time.After(time.Second * 2):
a.Warningf("discoverer '%v' didn't exit on ctx done", d)
}
return
case <-done:
if !isDone(ctx) {
a.Infof("discoverer '%v' exited before ctx done", d)
}
return
case tggs := <-updates:
a.mux.Lock()
a.groupsUpdate(tggs)
a.mux.Unlock()
a.triggerSend()
}
}
}
func (a *accumulator) trySend(in chan<- []model.TargetGroup) {
a.mux.Lock()
defer a.mux.Unlock()
select {
case in <- a.groupsList():
a.groupsReset()
default:
a.triggerSend()
}
}
func (a *accumulator) triggerSend() {
select {
case a.send <- struct{}{}:
default:
}
}
func (a *accumulator) groupsUpdate(tggs []model.TargetGroup) {
for _, tgg := range tggs {
a.tggs[tgg.Source()] = tgg
}
}
func (a *accumulator) groupsReset() {
for key := range a.tggs {
delete(a.tggs, key)
}
}
func (a *accumulator) groupsList() []model.TargetGroup {
tggs := make([]model.TargetGroup, 0, len(a.tggs))
for _, tgg := range a.tggs {
if tgg != nil {
tggs = append(tggs, tgg)
}
}
return tggs
}
func isDone(ctx context.Context) bool {
select {
case <-ctx.Done():
return true
default:
return false
}
}
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