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package sqs
import (
"fmt"
"github.com/aws/aws-sdk-go/service/sqs"
"github.com/spiral/jobs/v2"
"sync"
)
// Broker represents SQS broker.
type Broker struct {
cfg *Config
sqs *sqs.SQS
lsn func(event int, ctx interface{})
mu sync.Mutex
wait chan error
stopped chan interface{}
queues map[*jobs.Pipeline]*queue
}
// Listen attaches server event watcher.
func (b *Broker) Listen(lsn func(event int, ctx interface{})) {
b.lsn = lsn
}
// Init configures SQS broker.
func (b *Broker) Init(cfg *Config) (ok bool, err error) {
b.cfg = cfg
b.queues = make(map[*jobs.Pipeline]*queue)
return true, nil
}
// Register broker pipeline.
func (b *Broker) Register(pipe *jobs.Pipeline) error {
b.mu.Lock()
defer b.mu.Unlock()
if _, ok := b.queues[pipe]; ok {
return fmt.Errorf("queue `%s` has already been registered", pipe.Name())
}
q, err := newQueue(pipe, b.throw)
if err != nil {
return err
}
b.queues[pipe] = q
return nil
}
// Serve broker pipelines.
func (b *Broker) Serve() (err error) {
b.mu.Lock()
b.sqs, err = b.cfg.SQS()
if err != nil {
return err
}
for _, q := range b.queues {
q.url, err = q.declareQueue(b.sqs)
if err != nil {
return err
}
}
for _, q := range b.queues {
qq := q
if qq.execPool != nil {
go qq.serve(b.sqs, b.cfg.TimeoutDuration())
}
}
b.wait = make(chan error)
b.stopped = make(chan interface{})
defer close(b.stopped)
b.mu.Unlock()
b.throw(jobs.EventBrokerReady, b)
return <-b.wait
}
// Stop all pipelines.
func (b *Broker) Stop() {
b.mu.Lock()
defer b.mu.Unlock()
if b.wait == nil {
return
}
for _, q := range b.queues {
q.stop()
}
b.wait <- nil
<-b.stopped
}
// Consume configures pipeline to be consumed. With execPool to nil to disable consuming. Method can be called before
// the service is started!
func (b *Broker) Consume(pipe *jobs.Pipeline, execPool chan jobs.Handler, errHandler jobs.ErrorHandler) error {
b.mu.Lock()
defer b.mu.Unlock()
q, ok := b.queues[pipe]
if !ok {
return fmt.Errorf("undefined queue `%s`", pipe.Name())
}
q.stop()
q.execPool = execPool
q.errHandler = errHandler
if b.sqs != nil && q.execPool != nil {
go q.serve(b.sqs, b.cfg.TimeoutDuration())
}
return nil
}
// Push job into the worker.
func (b *Broker) Push(pipe *jobs.Pipeline, j *jobs.Job) (string, error) {
if err := b.isServing(); err != nil {
return "", err
}
q := b.queue(pipe)
if q == nil {
return "", fmt.Errorf("undefined queue `%s`", pipe.Name())
}
if j.Options.Delay > 900 || j.Options.RetryDelay > 900 {
return "", fmt.Errorf("unable to push into `%s`, maximum delay value is 900", pipe.Name())
}
return q.send(b.sqs, j)
}
// Stat must fetch statistics about given pipeline or return error.
func (b *Broker) Stat(pipe *jobs.Pipeline) (stat *jobs.Stat, err error) {
if err := b.isServing(); err != nil {
return nil, err
}
q := b.queue(pipe)
if q == nil {
return nil, fmt.Errorf("undefined queue `%s`", pipe.Name())
}
return q.stat(b.sqs)
}
// check if broker is serving
func (b *Broker) isServing() error {
b.mu.Lock()
defer b.mu.Unlock()
if b.wait == nil {
return fmt.Errorf("broker is not running")
}
return nil
}
// queue returns queue associated with the pipeline.
func (b *Broker) queue(pipe *jobs.Pipeline) *queue {
b.mu.Lock()
defer b.mu.Unlock()
q, ok := b.queues[pipe]
if !ok {
return nil
}
return q
}
// throw handles service, server and pool events.
func (b *Broker) throw(event int, ctx interface{}) {
if b.lsn != nil {
b.lsn(event, ctx)
}
}
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