100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
package sub
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"time"
|
|
|
|
"github.com/grassrootseconomics/cic-custodial/internal/custodial"
|
|
"github.com/nats-io/nats.go"
|
|
"github.com/zerodha/logf"
|
|
)
|
|
|
|
const (
|
|
durableId = "cic-custodial"
|
|
pullStream = "CHAIN"
|
|
pullSubject = "CHAIN.*"
|
|
actionTimeout = 5 * time.Second
|
|
waitDelay = 1 * time.Second
|
|
)
|
|
|
|
type (
|
|
SubOpts struct {
|
|
CustodialContainer *custodial.Custodial
|
|
JsCtx nats.JetStreamContext
|
|
Logg logf.Logger
|
|
NatsConn *nats.Conn
|
|
}
|
|
|
|
Sub struct {
|
|
cu *custodial.Custodial
|
|
jsCtx nats.JetStreamContext
|
|
logg logf.Logger
|
|
natsConn *nats.Conn
|
|
}
|
|
)
|
|
|
|
func NewSub(o SubOpts) (*Sub, error) {
|
|
_, err := o.JsCtx.AddConsumer(pullStream, &nats.ConsumerConfig{
|
|
Durable: durableId,
|
|
AckPolicy: nats.AckExplicitPolicy,
|
|
FilterSubject: pullSubject,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &Sub{
|
|
cu: o.CustodialContainer,
|
|
jsCtx: o.JsCtx,
|
|
logg: o.Logg,
|
|
natsConn: o.NatsConn,
|
|
}, nil
|
|
}
|
|
|
|
func (s *Sub) Process() error {
|
|
subOpts := []nats.SubOpt{
|
|
nats.ManualAck(),
|
|
nats.Bind(pullStream, durableId),
|
|
}
|
|
|
|
natsSub, err := s.jsCtx.PullSubscribe(pullSubject, durableId, subOpts...)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for {
|
|
events, err := natsSub.Fetch(1)
|
|
if err != nil {
|
|
if errors.Is(err, nats.ErrTimeout) {
|
|
s.logg.Debug("sub: no msg to pull")
|
|
continue
|
|
} else if errors.Is(err, nats.ErrConnectionClosed) {
|
|
return nil
|
|
} else {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if len(events) > 0 {
|
|
msg := events[0]
|
|
ctx, cancel := context.WithTimeout(context.Background(), actionTimeout)
|
|
|
|
if err := s.handler(ctx, msg); err != nil {
|
|
s.logg.Error("sub: handler error", "error", err)
|
|
msg.Nak()
|
|
} else {
|
|
s.logg.Debug("sub: processed msg", "subject", msg.Subject)
|
|
msg.Ack()
|
|
}
|
|
cancel()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Sub) Close() {
|
|
if s.natsConn != nil {
|
|
s.natsConn.Close()
|
|
}
|
|
}
|