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nsq_to_http.go
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nsq_to_http.go
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// This is an NSQ client that reads the specified topic/channel
// and performs HTTP requests (GET/POST) to the specified endpoints
package main
import (
"bytes"
"errors"
"flag"
"fmt"
"log"
"math/rand"
"net/url"
"os"
"os/signal"
"strings"
"sync/atomic"
"syscall"
"time"
"github.com/bitly/go-hostpool"
"github.com/bitly/go-nsq"
"github.com/bitly/nsq/util"
"github.com/bitly/nsq/util/timermetrics"
)
const (
ModeAll = iota
ModeRoundRobin
ModeHostPool
)
var (
showVersion = flag.Bool("version", false, "print version string")
topic = flag.String("topic", "", "nsq topic")
channel = flag.String("channel", "nsq_to_http", "nsq channel")
maxInFlight = flag.Int("max-in-flight", 200, "max number of messages to allow in flight")
numPublishers = flag.Int("n", 100, "number of concurrent publishers")
mode = flag.String("mode", "round-robin", "the upstream request mode options: multicast, round-robin, hostpool")
sample = flag.Float64("sample", 1.0, "% of messages to publish (float b/w 0 -> 1)")
httpTimeout = flag.Duration("http-timeout", 20*time.Second, "timeout for HTTP connect/read/write (each)")
statusEvery = flag.Int("status-every", 250, "the # of requests between logging status (per handler), 0 disables")
contentType = flag.String("content-type", "application/octet-stream", "the Content-Type used for POST requests")
readerOpts = util.StringArray{}
getAddrs = util.StringArray{}
postAddrs = util.StringArray{}
nsqdTCPAddrs = util.StringArray{}
lookupdHTTPAddrs = util.StringArray{}
// TODO: remove, deprecated
roundRobin = flag.Bool("round-robin", false, "(deprecated) use --mode=round-robin, enable round robin mode")
maxBackoffDuration = flag.Duration("max-backoff-duration", 120*time.Second, "(deprecated) use --reader-opt=max_backoff_duration=X, the maximum backoff duration")
throttleFraction = flag.Float64("throttle-fraction", 1.0, "(deprecated) use --sample=X, publish only a fraction of messages")
httpTimeoutMs = flag.Int("http-timeout-ms", 20000, "(deprecated) use --http-timeout=X, timeout for HTTP connect/read/write (each)")
)
func init() {
flag.Var(&readerOpts, "reader-opt", "option to passthrough to nsq.Consumer (may be given multiple times)")
flag.Var(&postAddrs, "post", "HTTP address to make a POST request to. data will be in the body (may be given multiple times)")
flag.Var(&getAddrs, "get", "HTTP address to make a GET request to. '%s' will be printf replaced with data (may be given multiple times)")
flag.Var(&nsqdTCPAddrs, "nsqd-tcp-address", "nsqd TCP address (may be given multiple times)")
flag.Var(&lookupdHTTPAddrs, "lookupd-http-address", "lookupd HTTP address (may be given multiple times)")
}
type Publisher interface {
Publish(string, []byte) error
}
type PublishHandler struct {
Publisher
addresses util.StringArray
counter uint64
mode int
hostPool hostpool.HostPool
perAddressStatus map[string]*timermetrics.TimerMetrics
timermetrics *timermetrics.TimerMetrics
}
func (ph *PublishHandler) HandleMessage(m *nsq.Message) error {
if *sample < 1.0 && rand.Float64() > *sample {
return nil
}
startTime := time.Now()
switch ph.mode {
case ModeAll:
for _, addr := range ph.addresses {
st := time.Now()
err := ph.Publish(addr, m.Body)
if err != nil {
return err
}
ph.perAddressStatus[addr].Status(st)
}
case ModeRoundRobin:
counter := atomic.AddUint64(&ph.counter, 1)
idx := counter % uint64(len(ph.addresses))
addr := ph.addresses[idx]
err := ph.Publish(addr, m.Body)
if err != nil {
return err
}
ph.perAddressStatus[addr].Status(startTime)
case ModeHostPool:
hostPoolResponse := ph.hostPool.Get()
addr := hostPoolResponse.Host()
err := ph.Publish(addr, m.Body)
hostPoolResponse.Mark(err)
if err != nil {
return err
}
ph.perAddressStatus[addr].Status(startTime)
}
ph.timermetrics.Status(startTime)
return nil
}
type PostPublisher struct{}
func (p *PostPublisher) Publish(addr string, msg []byte) error {
buf := bytes.NewBuffer(msg)
resp, err := HttpPost(addr, buf)
if err != nil {
return err
}
resp.Body.Close()
if resp.StatusCode != 200 {
return errors.New(fmt.Sprintf("got status code %d", resp.StatusCode))
}
return nil
}
type GetPublisher struct{}
func (p *GetPublisher) Publish(addr string, msg []byte) error {
endpoint := fmt.Sprintf(addr, url.QueryEscape(string(msg)))
resp, err := HttpGet(endpoint)
if err != nil {
return err
}
resp.Body.Close()
if resp.StatusCode != 200 {
return errors.New(fmt.Sprintf("got status code %d", resp.StatusCode))
}
return nil
}
func hasArg(s string) bool {
for _, arg := range os.Args {
if strings.Contains(arg, s) {
return true
}
}
return false
}
func main() {
var publisher Publisher
var addresses util.StringArray
var selectedMode int
flag.Parse()
if *showVersion {
fmt.Printf("nsq_to_http v%s\n", util.BINARY_VERSION)
return
}
if *topic == "" || *channel == "" {
log.Fatalf("--topic and --channel are required")
}
if *contentType != flag.Lookup("content-type").DefValue {
if len(postAddrs) == 0 {
log.Fatalf("--content-type only used with --post")
}
if len(*contentType) == 0 {
log.Fatalf("--content-type requires a value when used")
}
}
if len(nsqdTCPAddrs) == 0 && len(lookupdHTTPAddrs) == 0 {
log.Fatalf("--nsqd-tcp-address or --lookupd-http-address required")
}
if len(nsqdTCPAddrs) > 0 && len(lookupdHTTPAddrs) > 0 {
log.Fatalf("use --nsqd-tcp-address or --lookupd-http-address not both")
}
if len(getAddrs) == 0 && len(postAddrs) == 0 {
log.Fatalf("--get or --post required")
}
if len(getAddrs) > 0 && len(postAddrs) > 0 {
log.Fatalf("use --get or --post not both")
}
if len(getAddrs) > 0 {
for _, get := range getAddrs {
if strings.Count(get, "%s") != 1 {
log.Fatal("invalid GET address - must be a printf string")
}
}
}
switch *mode {
case "multicast":
log.Printf("WARNING: multicast mode is deprecated in favor of using separate nsq_to_http on different channels (and will be dropped in a future release)")
selectedMode = ModeAll
case "round-robin":
selectedMode = ModeRoundRobin
case "hostpool":
selectedMode = ModeHostPool
}
// TODO: remove, deprecated
if hasArg("--round-robin") {
log.Printf("WARNING: --round-robin is deprecated in favor of --mode=round-robin")
selectedMode = ModeRoundRobin
}
// TODO: remove, deprecated
if hasArg("throttle-fraction") {
log.Printf("WARNING: --throttle-fraction is deprecatedin favor of --sample=X")
*sample = *throttleFraction
}
if *sample > 1.0 || *sample < 0.0 {
log.Fatalf("ERROR: --sample must be between 0.0 and 1.0")
}
// TODO: remove, deprecated
if hasArg("http-timeout-ms") {
log.Printf("WARNING: --http-timeout-ms is deprecated in favor of --http-timeout=X")
*httpTimeout = time.Duration(*httpTimeoutMs) * time.Millisecond
}
termChan := make(chan os.Signal, 1)
signal.Notify(termChan, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
if len(postAddrs) > 0 {
publisher = &PostPublisher{}
addresses = postAddrs
} else {
publisher = &GetPublisher{}
addresses = getAddrs
}
cfg := nsq.NewConfig()
cfg.UserAgent = fmt.Sprintf("nsq_to_http/%s go-nsq/%s", util.BINARY_VERSION, nsq.VERSION)
err := util.ParseReaderOpts(cfg, readerOpts)
if err != nil {
log.Fatalf(err.Error())
}
cfg.MaxInFlight = *maxInFlight
// TODO: remove, deprecated
if hasArg("max-backoff-duration") {
log.Printf("WARNING: --max-backoff-duration is deprecated in favor of --reader-opt=max_backoff_duration=X")
cfg.MaxBackoffDuration = *maxBackoffDuration
}
r, err := nsq.NewConsumer(*topic, *channel, cfg)
if err != nil {
log.Fatalf(err.Error())
}
perAddressStatus := make(map[string]*timermetrics.TimerMetrics)
if len(addresses) == 1 {
// disable since there is only one address
perAddressStatus[addresses[0]] = timermetrics.NewTimerMetrics(0, "")
} else {
for _, a := range addresses {
perAddressStatus[a] = timermetrics.NewTimerMetrics(*statusEvery,
fmt.Sprintf("[%s]:", a))
}
}
handler := &PublishHandler{
Publisher: publisher,
addresses: addresses,
mode: selectedMode,
hostPool: hostpool.New(addresses),
perAddressStatus: perAddressStatus,
timermetrics: timermetrics.NewTimerMetrics(*statusEvery, "[aggregate]:"),
}
r.AddConcurrentHandlers(handler, *numPublishers)
for _, addrString := range nsqdTCPAddrs {
err := r.ConnectToNSQD(addrString)
if err != nil {
log.Fatalf("%s", err)
}
}
for _, addrString := range lookupdHTTPAddrs {
log.Printf("lookupd addr %s", addrString)
err := r.ConnectToNSQLookupd(addrString)
if err != nil {
log.Fatalf("%s", err)
}
}
for {
select {
case <-r.StopChan:
return
case <-termChan:
r.Stop()
}
}
}