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client.go
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client.go
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package nats
import (
"context"
"fmt"
"os"
"time"
"github.com/cenkalti/backoff"
backoffv2 "github.com/lestrrat-go/backoff/v2"
"github.com/nats-io/nats.go"
"github.com/rancher/opni/pkg/logger"
"go.uber.org/zap"
)
type natsAcquireOptions struct {
lg *zap.SugaredLogger
retrier backoffv2.Policy
natsOpts []nats.Option
streams []*nats.StreamConfig
}
func (o *natsAcquireOptions) apply(opts ...NatsAcquireOption) {
for _, opt := range opts {
opt(o)
}
}
type NatsAcquireOption func(*natsAcquireOptions)
func WithNatsOptions(opts []nats.Option) NatsAcquireOption {
return func(o *natsAcquireOptions) {
o.natsOpts = opts
}
}
func WithLogger(lg *zap.SugaredLogger) NatsAcquireOption {
return func(o *natsAcquireOptions) {
o.lg = lg
}
}
func WithRetrier(retrier backoffv2.Policy) NatsAcquireOption {
return func(o *natsAcquireOptions) {
o.retrier = retrier
}
}
func WithCreateStreams(streamNames ...*nats.StreamConfig) NatsAcquireOption {
return func(o *natsAcquireOptions) {
o.streams = streamNames
}
}
// !!blocking
//
// default retrier policy :
//
// retrier := backoffv2.Exponential(
//
// backoffv2.WithMaxRetries(0),
// backoffv2.WithMinInterval(5*time.Second),
// backoffv2.WithMaxInterval(1*time.Minute),
// backoffv2.WithMultiplier(1.1),
//
// )
//
// default nats client options:
//
// SeedKey : os.Getenv("NKEY_SEED_FILENAME")
//
// nats.MaxReconnects(-1),
// nats.CustomReconnectDelay(
//
// func(i int) time.Duration {
// if i == 1 {
// retryBackoff.Reset()
// }
// return retryBackoff.NextBackOff()
// },
//
// ),
// nats.DisconnectErrHandler(
//
// func(nc *nats.Conn, err error) {
// lg.Error(err)
// },
//
// ),
func AcquireNATSConnection(ctx context.Context, opts ...NatsAcquireOption) (*nats.Conn, error) {
options := &natsAcquireOptions{
lg: logger.NewPluginLogger().Named("nats-conn"),
retrier: backoffv2.Exponential(
backoffv2.WithMaxRetries(0),
backoffv2.WithMinInterval(5*time.Second),
backoffv2.WithMaxInterval(1*time.Minute),
backoffv2.WithMultiplier(1.1),
),
}
options.apply(opts...)
var (
nc *nats.Conn
err error
)
b := options.retrier.Start(ctx)
for backoffv2.Continue(b) {
nc, err = newNatsConnection(options.lg)
if err == nil {
break
}
options.lg.With("error", err).Warn("failed to connect to nats server, retrying")
}
mgr, err := nc.JetStream()
if err == nil {
for _, stream := range options.streams {
err = NewPersistentStream(mgr, stream)
if err != nil {
options.lg.Error(err)
}
}
} else {
options.lg.Error(err)
}
return nc, err
}
// until we have a better way to do this
func newNatsConnection(lg *zap.SugaredLogger, options ...nats.Option) (*nats.Conn, error) {
natsURL := os.Getenv("NATS_SERVER_URL")
natsSeedPath := os.Getenv("NKEY_SEED_FILENAME")
opt, err := nats.NkeyOptionFromSeed(natsSeedPath)
if err != nil {
return nil, err
}
retryBackoff := backoff.NewExponentialBackOff()
defaultOps := []nats.Option{
opt,
nats.MaxReconnects(-1),
nats.CustomReconnectDelay(
func(i int) time.Duration {
if i == 1 {
retryBackoff.Reset()
}
return retryBackoff.NextBackOff()
},
),
nats.DisconnectErrHandler(
func(nc *nats.Conn, err error) {
lg.Error(err)
},
),
}
defaultOps = append(defaultOps, options...)
return nats.Connect(
natsURL,
defaultOps...,
)
}
func NewPersistentStream(mgr nats.JetStreamContext, streamConfig *nats.StreamConfig) error {
if stream, _ := mgr.StreamInfo(streamConfig.Name); stream == nil {
_, err := mgr.AddStream(streamConfig)
if err != nil {
return err
}
}
return nil
}
func NewDurableReplayConsumer(mgr nats.JetStreamContext, streamName string, consumerConfig *nats.ConsumerConfig) error {
if consumerConfig.Durable == "" {
return fmt.Errorf("consumer config must be durable")
}
if consumerConfig.ReplayPolicy != nats.ReplayInstantPolicy {
return fmt.Errorf("consumer config must be replay instant policy")
}
if _, err := mgr.ConsumerInfo(streamName, consumerConfig.Durable); err != nil {
_, err := mgr.AddConsumer(streamName, consumerConfig)
if err != nats.ErrConsumerNameAlreadyInUse {
return err
}
}
return nil
}