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NatsClient.go
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NatsClient.go
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/*
* Copyright (c) 2020 Devtron Labs
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package pubsub
import (
"time"
"github.com/caarlos0/env"
"github.com/nats-io/nats.go"
"go.uber.org/zap"
)
type PubSubClient struct {
logger *zap.SugaredLogger
JetStrCtxt nats.JetStreamContext
Conn nats.Conn
}
type PubSubConfig struct {
NatsServerHost string `env:"NATS_SERVER_HOST" envDefault:"nats://localhost:4222"`
}
/* #nosec */
func NewPubSubClient(logger *zap.SugaredLogger) (*PubSubClient, error) {
cfg := &PubSubConfig{}
err := env.Parse(cfg)
if err != nil {
logger.Error("err", err)
return &PubSubClient{}, err
}
//Connect to NATS
nc, err := nats.Connect(cfg.NatsServerHost,
nats.ReconnectWait(10*time.Second), nats.MaxReconnects(100),
nats.DisconnectErrHandler(func(nc *nats.Conn, err error) {
logger.Errorw("Nats Connection got disconnected!", "Reason", err)
}),
nats.ReconnectHandler(func(nc *nats.Conn) {
logger.Infow("Nats Connection got reconnected", "url", nc.ConnectedUrl())
}),
nats.ClosedHandler(func(nc *nats.Conn) {
logger.Errorw("Nats Client Connection closed!", "Reason", nc.LastError())
}))
if err != nil {
logger.Error("err", err)
return &PubSubClient{}, err
}
//Create a jetstream context
js, err := nc.JetStream()
if err != nil {
logger.Errorw("Error while creating jetstream context", "error", err)
}
natsClient := &PubSubClient{
logger: logger,
JetStrCtxt: js,
}
return natsClient, nil
}