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package amqp
import (
"fmt"
"github.com/gofrs/uuid"
"github.com/spiral/jobs/v2"
"sync"
"sync/atomic"
)
// Broker represents AMQP broker.
type Broker struct {
cfg *Config
lsn func(event int, ctx interface{})
publish *chanPool
consume *chanPool
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 AMQP job broker (always 2 connections).
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()
if b.publish, err = newConn(b.cfg.Addr, b.cfg.TimeoutDuration()); err != nil {
b.mu.Unlock()
return err
}
defer b.publish.Close()
if b.consume, err = newConn(b.cfg.Addr, b.cfg.TimeoutDuration()); err != nil {
b.mu.Unlock()
return err
}
defer b.consume.Close()
for _, q := range b.queues {
err := q.declare(b.publish, q.name, q.key, nil)
if err != nil {
b.mu.Unlock()
return err
}
}
for _, q := range b.queues {
qq := q
if qq.execPool != nil {
go qq.serve(b.publish, b.consume)
}
}
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()
}
close(b.wait)
<-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.publish != nil && q.execPool != nil {
if q.execPool != nil {
go q.serve(b.publish, b.consume)
}
}
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
}
id, err := uuid.NewV4()
if err != nil {
return "", err
}
q := b.queue(pipe)
if q == nil {
return "", fmt.Errorf("undefined queue `%s`", pipe.Name())
}
if err := q.publish(b.publish, id.String(), 0, j, j.Options.DelayDuration()); err != nil {
return "", err
}
return id.String(), nil
}
// 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())
}
queue, err := q.inspect(b.publish)
if err != nil {
return nil, err
}
// this the closest approximation we can get for now
return &jobs.Stat{
InternalName: queue.Name,
Queue: int64(queue.Messages),
Active: int64(atomic.LoadInt32(&q.running)),
}, nil
}
// 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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