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package ephemeral
import (
"sync"
"sync/atomic"
"time"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/pkg/events"
priorityqueue "github.com/spiral/roadrunner/v2/pkg/priority_queue"
"github.com/spiral/roadrunner/v2/plugins/config"
"github.com/spiral/roadrunner/v2/plugins/jobs/job"
"github.com/spiral/roadrunner/v2/plugins/jobs/pipeline"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
const (
prefetch string = "prefetch"
)
type Config struct {
Prefetch uint64 `mapstructure:"prefetch"`
}
type JobBroker struct {
cfg *Config
log logger.Logger
eh events.Handler
pipeline sync.Map
pq priorityqueue.Queue
localPrefetch chan *Item
goroutinesMaxNum uint64
stopCh chan struct{}
}
func NewJobBroker(configKey string, log logger.Logger, cfg config.Configurer, eh events.Handler, pq priorityqueue.Queue) (*JobBroker, error) {
const op = errors.Op("new_ephemeral_pipeline")
jb := &JobBroker{
log: log,
pq: pq,
eh: eh,
goroutinesMaxNum: 1000,
stopCh: make(chan struct{}, 1),
}
err := cfg.UnmarshalKey(configKey, &jb.cfg)
if err != nil {
return nil, errors.E(op, err)
}
if jb.cfg.Prefetch == 0 {
jb.cfg.Prefetch = 100_000
}
// initialize a local queue
jb.localPrefetch = make(chan *Item, jb.cfg.Prefetch)
// consume from the queue
go jb.consume()
return jb, nil
}
func FromPipeline(pipeline *pipeline.Pipeline, log logger.Logger, eh events.Handler, pq priorityqueue.Queue) (*JobBroker, error) {
jb := &JobBroker{
log: log,
pq: pq,
eh: eh,
goroutinesMaxNum: 1000,
stopCh: make(chan struct{}, 1),
}
// initialize a local queue
jb.localPrefetch = make(chan *Item, pipeline.Int(prefetch, 100_000))
// consume from the queue
go jb.consume()
return jb, nil
}
func (j *JobBroker) Push(jb *job.Job) error {
const op = errors.Op("ephemeral_push")
// check if the pipeline registered
if b, ok := j.pipeline.Load(jb.Options.Pipeline); ok {
if !b.(bool) {
return errors.E(op, errors.Errorf("pipeline disabled: %s", jb.Options.Pipeline))
}
msg := fromJob(jb)
// handle timeouts
// theoretically, some bad user may send a millions requests with a delay and produce a billion (for example)
// goroutines here. We should limit goroutines here.
if msg.Options.Delay > 0 {
// if we have 1000 goroutines waiting on the delay - reject 1001
if atomic.LoadUint64(&j.goroutinesMaxNum) >= 1000 {
return errors.E(op, errors.Str("max concurrency number reached"))
}
go func(jj *job.Job) {
atomic.AddUint64(&j.goroutinesMaxNum, 1)
time.Sleep(jj.Options.DelayDuration())
// send the item after timeout expired
j.localPrefetch <- msg
atomic.AddUint64(&j.goroutinesMaxNum, ^uint64(0))
}(jb)
return nil
}
// insert to the local, limited pipeline
select {
case j.localPrefetch <- msg:
default:
return errors.E(op, errors.Errorf("local pipeline is full, consider to increase prefetch number, current limit: %d", j.cfg.Prefetch))
}
return nil
}
return errors.E(op, errors.Errorf("no such pipeline: %s", jb.Options.Pipeline))
}
func (j *JobBroker) consume() {
// redirect
for {
select {
case item := <-j.localPrefetch:
j.pq.Insert(item)
case <-j.stopCh:
return
}
}
}
func (j *JobBroker) Register(pipeline *pipeline.Pipeline) error {
const op = errors.Op("ephemeral_register")
if _, ok := j.pipeline.Load(pipeline.Name()); ok {
return errors.E(op, errors.Errorf("queue %s has already been registered", pipeline))
}
j.pipeline.Store(pipeline.Name(), true)
return nil
}
func (j *JobBroker) Pause(pipeline string) {
if q, ok := j.pipeline.Load(pipeline); ok {
if q == true {
// mark pipeline as turned off
j.pipeline.Store(pipeline, false)
}
}
j.eh.Push(events.JobEvent{
Event: events.EventPipeStopped,
Pipeline: pipeline,
Start: time.Now(),
Elapsed: 0,
})
}
func (j *JobBroker) Resume(pipeline string) {
if q, ok := j.pipeline.Load(pipeline); ok {
if q == false {
// mark pipeline as turned on
j.pipeline.Store(pipeline, true)
}
}
j.eh.Push(events.JobEvent{
Event: events.EventPipeActive,
Pipeline: pipeline,
Start: time.Now(),
Elapsed: 0,
})
}
// Run is no-op for the ephemeral
func (j *JobBroker) Run(pipe *pipeline.Pipeline) error {
j.eh.Push(events.JobEvent{
Event: events.EventPipeRun,
Driver: pipe.Driver(),
Pipeline: pipe.Name(),
Start: time.Now(),
})
return nil
}
func (j *JobBroker) Stop() error {
var pipe string
j.pipeline.Range(func(key, _ interface{}) bool {
pipe = key.(string)
j.pipeline.Delete(key)
return true
})
// return from the consumer
j.stopCh <- struct{}{}
j.eh.Push(events.JobEvent{
Event: events.EventPipeStopped,
Pipeline: pipe,
Start: time.Now(),
Elapsed: 0,
})
return nil
}
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