/
nats.go
55 lines (48 loc) · 1.47 KB
/
nats.go
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package isconn
import (
"fmt"
"github.com/nats-io/nats.go"
)
func DefaultNatsErrHandler(logger Logger) nats.ErrHandler {
return func(c *nats.Conn, sub *nats.Subscription, err error) {
switch sub {
case nil:
logger.Errorf("nats error handler: no subject: %w", err)
default:
logger.Errorf("nats error handler: subject = %s: %w", sub.Subject, err)
}
}
}
func DefaultNatsDisconnectErrHandler(logger Logger) nats.ConnErrHandler {
return func(c *nats.Conn, err error) {
logger.Errorf("nats disconected: %v", err)
}
}
func DefaultNatsReconnectHandler(logger Logger) nats.ConnHandler {
return func(c *nats.Conn) {
logger.Infof("nats reconnected: %s ....", c.ConnectedUrl())
}
}
func NewNatsClient(cfg *Config, logger Logger) (*nats.Conn, error) {
nc, err := nats.Connect(
cfg.NatsURL,
nats.Timeout(cfg.ConnectTimeout),
nats.ReconnectWait(cfg.ReconnectWait),
nats.MaxReconnects(int(cfg.TotalWait/cfg.ReconnectWait)),
nats.ReconnectBufSize(cfg.ReconnectBufSize),
nats.ErrorHandler(DefaultNatsErrHandler(logger)),
nats.DisconnectErrHandler(DefaultNatsDisconnectErrHandler(logger)),
nats.ReconnectHandler(DefaultNatsReconnectHandler(logger)),
)
if err != nil {
return nil, fmt.Errorf("create nats client: %v", err)
}
return nc, nil
}
func NewNatsJS(cfg *Config, nc *nats.Conn) (nats.JetStreamContext, error) {
js, err := nc.JetStream(nats.MaxWait(cfg.MaxWaitResp))
if err != nil {
return nil, fmt.Errorf("create js context: %v", err)
}
return js, nil
}