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nsq.go
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nsq.go
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// Copyright (c) 2014 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package output
import (
"io/ioutil"
llog "log"
"sync/atomic"
"time"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/service/metrics"
nsq "github.com/nsqio/go-nsq"
)
//------------------------------------------------------------------------------
func init() {
Constructors["nsq"] = TypeSpec{
constructor: NewNSQ,
description: `
Publish to an NSQ topic.`,
}
}
//------------------------------------------------------------------------------
// NSQConfig is configuration for the NSQ output type.
type NSQConfig struct {
Address string `json:"nsqd_tcp_address" yaml:"nsqd_tcp_address"`
Topic string `json:"topic" yaml:"topic"`
UserAgent string `json:"user_agent" yaml:"user_agent"`
MaxInFlight int `json:"max_in_flight" yaml:"max_in_flight"`
}
// NewNSQConfig creates a new NSQConfig with default values.
func NewNSQConfig() NSQConfig {
return NSQConfig{
Address: "localhost:4150",
Topic: "benthos_messages",
UserAgent: "benthos_producer",
MaxInFlight: 100,
}
}
//------------------------------------------------------------------------------
// NSQ is an output type that serves NSQ messages.
type NSQ struct {
running int32
log log.Modular
stats metrics.Type
conf Config
producer *nsq.Producer
transactions <-chan types.Transaction
closedChan chan struct{}
closeChan chan struct{}
}
// NewNSQ creates a new NSQ output type.
func NewNSQ(conf Config, mgr types.Manager, log log.Modular, stats metrics.Type) (Type, error) {
n := NSQ{
running: 1,
log: log.NewModule(".output.nsq"),
stats: stats,
conf: conf,
closedChan: make(chan struct{}),
closeChan: make(chan struct{}),
}
return &n, nil
}
//------------------------------------------------------------------------------
// connect establishes a connection to an NSQ server.
func (n *NSQ) connect() (err error) {
cfg := nsq.NewConfig()
cfg.UserAgent = n.conf.NSQ.UserAgent
cfg.MaxInFlight = n.conf.NSQ.MaxInFlight
if n.producer, err = nsq.NewProducer(n.conf.NSQ.Address, cfg); err != nil {
return
}
n.producer.SetLogger(llog.New(ioutil.Discard, "", llog.Flags()), nsq.LogLevelError)
err = n.producer.Ping()
return
}
// disconnect safely closes a connection to an NSQ server.
func (n *NSQ) disconnect() error {
n.producer.Stop()
n.producer = nil
return nil
}
//------------------------------------------------------------------------------
// loop is an internal loop that brokers incoming messages to output pipe.
func (n *NSQ) loop() {
defer func() {
atomic.StoreInt32(&n.running, 0)
n.disconnect()
n.stats.Decr("output.nsq.running", 1)
close(n.closedChan)
}()
n.stats.Incr("output.nsq.running", 1)
for {
if err := n.connect(); err != nil {
n.log.Errorf("Failed to connect to NSQ: %v\n", err)
select {
case <-time.After(time.Second):
case <-n.closeChan:
return
}
} else {
break
}
}
n.log.Infof("Sending NSQ messages to address: %s\n", n.conf.NSQ.Address)
var open bool
for atomic.LoadInt32(&n.running) == 1 {
var ts types.Transaction
select {
case ts, open = <-n.transactions:
if !open {
return
}
case <-n.closeChan:
return
}
n.stats.Incr("output.nsq.count", 1)
var err error
for _, part := range ts.Payload.GetAll() {
err = n.producer.Publish(n.conf.NSQ.Topic, part)
if err != nil {
n.stats.Incr("output.nsq.send.error", 1)
break
} else {
n.stats.Incr("output.nsq.send.success", 1)
}
}
select {
case ts.ResponseChan <- types.NewSimpleResponse(err):
case <-n.closeChan:
return
}
}
}
// StartReceiving assigns a messages channel for the output to read.
func (n *NSQ) StartReceiving(ts <-chan types.Transaction) error {
if n.transactions != nil {
return types.ErrAlreadyStarted
}
n.transactions = ts
go n.loop()
return nil
}
// CloseAsync shuts down the NSQ output and stops processing messages.
func (n *NSQ) CloseAsync() {
if atomic.CompareAndSwapInt32(&n.running, 1, 0) {
close(n.closeChan)
}
}
// WaitForClose blocks until the NSQ output has closed down.
func (n *NSQ) WaitForClose(timeout time.Duration) error {
select {
case <-n.closedChan:
case <-time.After(timeout):
return types.ErrTimeout
}
return nil
}
//------------------------------------------------------------------------------