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package ephemeral
import (
"sync"
"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/pipeline"
"github.com/spiral/roadrunner/v2/plugins/jobs/structs"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
const (
pipelineSize string = "pipeline_size"
)
type Config struct {
PipelineSize uint64 `mapstructure:"pipeline_size"`
}
type JobBroker struct {
cfg *Config
log logger.Logger
eh events.Handler
pipeline sync.Map
pq priorityqueue.Queue
localQueue chan *Item
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,
stopCh: make(chan struct{}, 1),
}
err := cfg.UnmarshalKey(configKey, &jb.cfg)
if err != nil {
return nil, errors.E(op, err)
}
if jb.cfg.PipelineSize == 0 {
jb.cfg.PipelineSize = 100_000
}
// initialize a local queue
jb.localQueue = make(chan *Item, jb.cfg.PipelineSize)
// 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,
stopCh: make(chan struct{}, 1),
}
jb.cfg.PipelineSize = uint64(pipeline.Int(pipelineSize, 100_000))
// initialize a local queue
jb.localQueue = make(chan *Item, jb.cfg.PipelineSize)
// consume from the queue
go jb.consume()
return jb, nil
}
func (j *JobBroker) Push(job *structs.Job) error {
const op = errors.Op("ephemeral_push")
// check if the pipeline registered
if b, ok := j.pipeline.Load(job.Options.Pipeline); ok {
if !b.(bool) {
return errors.E(op, errors.Errorf("pipeline disabled: %s", job.Options.Pipeline))
}
// handle timeouts
if job.Options.Timeout > 0 {
go func(jj *structs.Job) {
time.Sleep(jj.Options.TimeoutDuration())
// send the item after timeout expired
j.localQueue <- From(job)
}(job)
return nil
}
// insert to the local, limited pipeline
j.localQueue <- From(job)
return nil
}
return errors.E(op, errors.Errorf("no such pipeline: %s", job.Options.Pipeline))
}
func (j *JobBroker) consume() {
// redirect
for {
select {
case item := <-j.localQueue:
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 off
j.pipeline.Store(pipeline, true)
}
}
j.eh.Push(events.JobEvent{
Event: events.EventPipeActive,
Pipeline: pipeline,
Start: time.Now(),
Elapsed: 0,
})
}
func (j *JobBroker) List() []string {
out := make([]string, 0, 2)
j.pipeline.Range(func(key, value interface{}) bool {
pipe := key.(string)
out = append(out, pipe)
return true
})
return out
}
// Run is no-op for the ephemeral
func (j *JobBroker) Run(_ *pipeline.Pipeline) error {
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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