/
output_jetstream.go
206 lines (172 loc) · 4.95 KB
/
output_jetstream.go
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package nats
import (
"context"
"crypto/tls"
"strings"
"sync"
"github.com/nats-io/nats.go"
"github.com/benthosdev/benthos/v4/internal/impl/nats/auth"
"github.com/benthosdev/benthos/v4/internal/shutdown"
"github.com/benthosdev/benthos/v4/public/service"
)
func natsJetStreamOutputConfig() *service.ConfigSpec {
return service.NewConfigSpec().
// Stable(). TODO
Categories("Services").
Version("3.46.0").
Summary("Write messages to a NATS JetStream subject.").
Description(auth.Description()).
Field(service.NewStringListField("urls").
Description("A list of URLs to connect to. If an item of the list contains commas it will be expanded into multiple URLs.").
Example([]string{"nats://127.0.0.1:4222"}).
Example([]string{"nats://username:password@127.0.0.1:4222"})).
Field(service.NewInterpolatedStringField("subject").
Description("A subject to write to.").
Example("foo.bar.baz").
Example(`${! meta("kafka_topic") }`).
Example(`foo.${! json("meta.type") }`)).
Field(service.NewInterpolatedStringMapField("headers").
Description("Explicit message headers to add to messages.").
Default(map[string]interface{}{}).
Example(map[string]interface{}{
"Content-Type": "application/json",
"Timestamp": `${!meta("Timestamp")}`,
}).Version("4.1.0")).
Field(service.NewIntField("max_in_flight").
Description("The maximum number of messages to have in flight at a given time. Increase this to improve throughput.").
Default(1024)).
Field(service.NewTLSToggledField("tls")).
Field(service.NewInternalField(auth.FieldSpec()))
}
func init() {
err := service.RegisterOutput(
"nats_jetstream", natsJetStreamOutputConfig(),
func(conf *service.ParsedConfig, mgr *service.Resources) (service.Output, int, error) {
maxInFlight, err := conf.FieldInt("max_in_flight")
if err != nil {
return nil, 0, err
}
w, err := newJetStreamWriterFromConfig(conf, mgr.Logger())
return w, maxInFlight, err
})
if err != nil {
panic(err)
}
}
//------------------------------------------------------------------------------
type jetStreamOutput struct {
urls string
subjectStrRaw string
subjectStr *service.InterpolatedString
headers map[string]*service.InterpolatedString
authConf auth.Config
tlsConf *tls.Config
log *service.Logger
connMut sync.Mutex
natsConn *nats.Conn
jCtx nats.JetStreamContext
shutSig *shutdown.Signaller
}
func newJetStreamWriterFromConfig(conf *service.ParsedConfig, log *service.Logger) (*jetStreamOutput, error) {
j := jetStreamOutput{
log: log,
shutSig: shutdown.NewSignaller(),
}
urlList, err := conf.FieldStringList("urls")
if err != nil {
return nil, err
}
j.urls = strings.Join(urlList, ",")
if j.subjectStrRaw, err = conf.FieldString("subject"); err != nil {
return nil, err
}
if j.subjectStr, err = conf.FieldInterpolatedString("subject"); err != nil {
return nil, err
}
if j.headers, err = conf.FieldInterpolatedStringMap("headers"); err != nil {
return nil, err
}
tlsConf, tlsEnabled, err := conf.FieldTLSToggled("tls")
if err != nil {
return nil, err
}
if tlsEnabled {
j.tlsConf = tlsConf
}
if j.authConf, err = AuthFromParsedConfig(conf.Namespace("auth")); err != nil {
return nil, err
}
return &j, nil
}
//------------------------------------------------------------------------------
func (j *jetStreamOutput) Connect(ctx context.Context) error {
j.connMut.Lock()
defer j.connMut.Unlock()
if j.natsConn != nil {
return nil
}
var natsConn *nats.Conn
var jCtx nats.JetStreamContext
var err error
defer func() {
if err != nil && natsConn != nil {
natsConn.Close()
}
}()
var opts []nats.Option
if j.tlsConf != nil {
opts = append(opts, nats.Secure(j.tlsConf))
}
opts = append(opts, auth.GetOptions(j.authConf)...)
if natsConn, err = nats.Connect(j.urls, opts...); err != nil {
return err
}
if jCtx, err = natsConn.JetStream(); err != nil {
return err
}
j.log.Infof("Sending NATS messages to JetStream subject: %v", j.subjectStrRaw)
j.natsConn = natsConn
j.jCtx = jCtx
return nil
}
func (j *jetStreamOutput) disconnect() {
j.connMut.Lock()
defer j.connMut.Unlock()
if j.natsConn != nil {
j.natsConn.Close()
j.natsConn = nil
}
j.jCtx = nil
}
//------------------------------------------------------------------------------
func (j *jetStreamOutput) Write(ctx context.Context, msg *service.Message) error {
j.connMut.Lock()
jCtx := j.jCtx
j.connMut.Unlock()
if jCtx == nil {
return service.ErrNotConnected
}
jsmsg := nats.NewMsg(j.subjectStr.String(msg))
msgBytes, err := msg.AsBytes()
if err != nil {
return err
}
jsmsg.Data = msgBytes
for k, v := range j.headers {
jsmsg.Header.Add(k, v.String(msg))
}
_, err = jCtx.PublishMsg(jsmsg)
return err
}
func (j *jetStreamOutput) Close(ctx context.Context) error {
go func() {
j.disconnect()
j.shutSig.ShutdownComplete()
}()
select {
case <-j.shutSig.HasClosedChan():
case <-ctx.Done():
return ctx.Err()
}
return nil
}