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controller.go
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controller.go
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package pipeline
import (
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/outputs"
"github.com/elastic/beats/libbeat/publisher/queue"
)
// outputController manages the pipelines output capabilites, like:
// - start
// - stop
// - reload
type outputController struct {
logger *logp.Logger
observer *observer
queue queue.Queue
retryer *retryer
consumer *eventConsumer
out *outputGroup
}
// outputGroup configures a group of load balanced outputs with shared work queue.
type outputGroup struct {
workQueue workQueue
outputs []outputWorker
batchSize int
timeToLive int // event lifetime
}
type workQueue chan *Batch
// outputWorker instances pass events from the shared workQueue to the outputs.Client
// instances.
type outputWorker interface {
Close() error
}
func newOutputController(
log *logp.Logger,
observer *observer,
b queue.Queue,
) *outputController {
c := &outputController{
logger: log,
observer: observer,
queue: b,
}
ctx := &batchContext{}
c.consumer = newEventConsumer(log, b, ctx)
c.retryer = newRetryer(log, observer, nil, c.consumer)
ctx.observer = c.observer
ctx.retryer = c.retryer
c.consumer.sigContinue()
return c
}
func (c *outputController) Close() error {
c.consumer.sigPause()
if c.out != nil {
for _, out := range c.out.outputs {
out.Close()
}
close(c.out.workQueue)
}
c.consumer.close()
c.retryer.close()
return nil
}
func (c *outputController) Set(outGrp outputs.Group) {
// create new outputGroup with shared work queue
clients := outGrp.Clients
queue := makeWorkQueue()
worker := make([]outputWorker, len(clients))
for i, client := range clients {
worker[i] = makeClientWorker(c.observer, queue, client)
}
grp := &outputGroup{
workQueue: queue,
outputs: worker,
timeToLive: outGrp.Retry + 1,
batchSize: outGrp.BatchSize,
}
// update consumer and retryer
c.consumer.sigPause()
if c.out != nil {
for range c.out.outputs {
c.retryer.sigOutputRemoved()
}
}
c.retryer.updOutput(queue)
for range clients {
c.retryer.sigOutputAdded()
}
c.consumer.updOutput(grp)
// close old group, so events are send to new workQueue via retryer
if c.out != nil {
for _, w := range c.out.outputs {
w.Close()
}
}
// restart consumer (potentially blocked by retryer)
c.consumer.sigContinue()
c.observer.updateOutputGroup()
}
func makeWorkQueue() workQueue {
return workQueue(make(chan *Batch, 0))
}