forked from benthosdev/benthos
/
nsq.go
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/
nsq.go
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package reader
import (
"context"
"crypto/tls"
"io"
llog "log"
"strings"
"sync"
"time"
"github.com/dafanshu/benthos/v3/lib/log"
"github.com/dafanshu/benthos/v3/lib/message"
"github.com/dafanshu/benthos/v3/lib/message/batch"
"github.com/dafanshu/benthos/v3/lib/metrics"
"github.com/dafanshu/benthos/v3/lib/types"
btls "github.com/dafanshu/benthos/v3/lib/util/tls"
nsq "github.com/nsqio/go-nsq"
)
//------------------------------------------------------------------------------
// NSQConfig contains configuration fields for the NSQ input type.
type NSQConfig struct {
Addresses []string `json:"nsqd_tcp_addresses" yaml:"nsqd_tcp_addresses"`
LookupAddresses []string `json:"lookupd_http_addresses" yaml:"lookupd_http_addresses"`
Topic string `json:"topic" yaml:"topic"`
Channel string `json:"channel" yaml:"channel"`
UserAgent string `json:"user_agent" yaml:"user_agent"`
TLS btls.Config `json:"tls" yaml:"tls"`
MaxInFlight int `json:"max_in_flight" yaml:"max_in_flight"`
Batching batch.PolicyConfig `json:"batching" yaml:"batching"`
}
// NewNSQConfig creates a new NSQConfig with default values.
func NewNSQConfig() NSQConfig {
return NSQConfig{
Addresses: []string{"localhost:4150"},
LookupAddresses: []string{"localhost:4161"},
Topic: "benthos_messages",
Channel: "benthos_stream",
UserAgent: "benthos_consumer",
TLS: btls.NewConfig(),
MaxInFlight: 100,
Batching: batch.NewPolicyConfig(),
}
}
//------------------------------------------------------------------------------
// NSQ is an input type that receives NSQ messages.
type NSQ struct {
consumer *nsq.Consumer
cMut sync.Mutex
unAckMsgs []*nsq.Message
tlsConf *tls.Config
addresses []string
lookupAddresses []string
conf NSQConfig
stats metrics.Type
log log.Modular
internalMessages chan *nsq.Message
interruptChan chan struct{}
}
// NewNSQ creates a new NSQ input type.
func NewNSQ(conf NSQConfig, log log.Modular, stats metrics.Type) (*NSQ, error) {
n := NSQ{
conf: conf,
stats: stats,
log: log,
internalMessages: make(chan *nsq.Message),
interruptChan: make(chan struct{}),
}
for _, addr := range conf.Addresses {
for _, splitAddr := range strings.Split(addr, ",") {
if len(splitAddr) > 0 {
n.addresses = append(n.addresses, splitAddr)
}
}
}
for _, addr := range conf.LookupAddresses {
for _, splitAddr := range strings.Split(addr, ",") {
if len(splitAddr) > 0 {
n.lookupAddresses = append(n.lookupAddresses, splitAddr)
}
}
}
if conf.TLS.Enabled {
var err error
if n.tlsConf, err = conf.TLS.Get(); err != nil {
return nil, err
}
}
return &n, nil
}
//------------------------------------------------------------------------------
// HandleMessage handles an NSQ message.
func (n *NSQ) HandleMessage(message *nsq.Message) error {
message.DisableAutoResponse()
select {
case n.internalMessages <- message:
case <-n.interruptChan:
message.Requeue(-1)
message.Finish()
}
return nil
}
//------------------------------------------------------------------------------
// Connect establishes a connection to an NSQ server.
func (n *NSQ) Connect() (err error) {
return n.ConnectWithContext(context.Background())
}
// ConnectWithContext establishes a connection to an NSQ server.
func (n *NSQ) ConnectWithContext(ctx context.Context) (err error) {
n.cMut.Lock()
defer n.cMut.Unlock()
if n.consumer != nil {
return nil
}
cfg := nsq.NewConfig()
cfg.UserAgent = n.conf.UserAgent
cfg.MaxInFlight = n.conf.MaxInFlight
if n.tlsConf != nil {
cfg.TlsV1 = true
cfg.TlsConfig = n.tlsConf
}
var consumer *nsq.Consumer
if consumer, err = nsq.NewConsumer(n.conf.Topic, n.conf.Channel, cfg); err != nil {
return
}
consumer.SetLogger(llog.New(io.Discard, "", llog.Flags()), nsq.LogLevelError)
consumer.AddHandler(n)
if err = consumer.ConnectToNSQDs(n.addresses); err != nil {
consumer.Stop()
return
}
if err = consumer.ConnectToNSQLookupds(n.lookupAddresses); err != nil {
consumer.Stop()
return
}
n.consumer = consumer
n.log.Infof("Receiving NSQ messages from addresses: %s\n", n.addresses)
return
}
// disconnect safely closes a connection to an NSQ server.
func (n *NSQ) disconnect() error {
n.cMut.Lock()
defer n.cMut.Unlock()
if n.consumer != nil {
n.consumer.Stop()
n.consumer = nil
}
return nil
}
//------------------------------------------------------------------------------
func (n *NSQ) read(ctx context.Context) (*nsq.Message, error) {
var msg *nsq.Message
select {
case msg = <-n.internalMessages:
return msg, nil
case <-ctx.Done():
case <-n.interruptChan:
for _, m := range n.unAckMsgs {
m.Requeue(-1)
m.Finish()
}
n.unAckMsgs = nil
n.disconnect()
return nil, types.ErrTypeClosed
}
return nil, types.ErrTimeout
}
// ReadWithContext attempts to read a new message from NSQ.
func (n *NSQ) ReadWithContext(ctx context.Context) (types.Message, AsyncAckFn, error) {
msg, err := n.read(ctx)
if err != nil {
return nil, nil, err
}
n.unAckMsgs = append(n.unAckMsgs, msg)
return message.New([][]byte{msg.Body}), func(rctx context.Context, res types.Response) error {
if res.Error() != nil {
msg.Requeue(-1)
}
msg.Finish()
return nil
}, nil
}
// Read attempts to read a new message from NSQ.
func (n *NSQ) Read() (types.Message, error) {
msg, err := n.read(context.Background())
if err != nil {
return nil, err
}
n.unAckMsgs = append(n.unAckMsgs, msg)
return message.New([][]byte{msg.Body}), nil
}
// Acknowledge instructs whether unacknowledged messages have been successfully
// propagated.
func (n *NSQ) Acknowledge(err error) error {
if err != nil {
for _, m := range n.unAckMsgs {
m.Requeue(-1)
}
}
for _, m := range n.unAckMsgs {
m.Finish()
}
n.unAckMsgs = nil
return nil
}
// CloseAsync shuts down the NSQ input and stops processing requests.
func (n *NSQ) CloseAsync() {
close(n.interruptChan)
}
// WaitForClose blocks until the NSQ input has closed down.
func (n *NSQ) WaitForClose(timeout time.Duration) error {
n.disconnect()
return nil
}
//------------------------------------------------------------------------------