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nats.go
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nats.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package server
import (
"time"
"github.com/cenkalti/backoff"
"github.com/cs3org/reva/v2/pkg/logger"
"go-micro.dev/v4/events"
"github.com/go-micro/plugins/v4/events/natsjs"
nserver "github.com/nats-io/nats-server/v2/server"
)
// RunNatsServer starts the nats server and blocks
func RunNatsServer(opts ...Option) error {
options := &nserver.Options{}
for _, o := range opts {
o(options)
}
server, err := nserver.NewServer(options)
if err != nil {
return err
}
c := &nserver.JetStreamConfig{}
err = server.EnableJetStream(c)
if err != nil {
return err
}
server.Start()
return nil
}
// NewNatsStream returns a streaming client used by `Consume` and `Publish` methods
// retries exponentially to connect to a nats server
func NewNatsStream(opts ...natsjs.Option) (events.Stream, error) {
b := backoff.NewExponentialBackOff()
var stream events.Stream
o := func() error {
n := b.NextBackOff()
s, err := natsjs.NewStream(opts...)
if err != nil && n > time.Second {
logger.New().Error().Err(err).Msgf("can't connect to nats (jetstream) server, retrying in %s", n)
}
stream = s
return err
}
err := backoff.Retry(o, b)
return stream, err
}