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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"strings"
"sync"
"time"
"github.com/asim/mq/broker"
mqclient "github.com/asim/mq/go/client"
mqgrpc "github.com/asim/mq/go/client/grpc"
mqresolver "github.com/asim/mq/go/client/resolver"
mqselector "github.com/asim/mq/go/client/selector"
"github.com/asim/mq/server"
grpcsrv "github.com/asim/mq/server/grpc"
httpsrv "github.com/asim/mq/server/http"
)
var (
address = flag.String("address", ":8081", "MQ server address")
cert = flag.String("cert_file", "", "TLS certificate file")
key = flag.String("key_file", "", "TLS key file")
// server persist to file
persist = flag.Bool("persist", false, "Persist messages to [topic].mq file per topic")
// proxy flags
proxy = flag.Bool("proxy", false, "Proxy for an MQ cluster")
retries = flag.Int("retries", 1, "Number of retries for publish or subscribe")
servers = flag.String("servers", "", "Comma separated MQ cluster list used by Proxy")
// client flags
interactive = flag.Bool("i", false, "Interactive client mode")
client = flag.Bool("client", false, "Run the MQ client")
publish = flag.Bool("publish", false, "Publish via the MQ client")
subscribe = flag.Bool("subscribe", false, "Subscribe via the MQ client")
topic = flag.String("topic", "", "Topic for client to publish or subscribe to")
// select strategy
selector = flag.String("select", "all", "Server select strategy. Supports all, shard")
// resolver for discovery
resolver = flag.String("resolver", "ip", "Server resolver for discovery. Supports ip, dns")
// transport http or grpc
transport = flag.String("transport", "http", "Transport for communication. Support http, grpc")
)
func init() {
flag.Parse()
if *proxy && *client {
log.Fatal("Client and proxy flags cannot be specified together")
}
if *proxy && len(*servers) == 0 {
log.Fatal("Proxy enabled without MQ server list")
}
if *client && len(*topic) == 0 {
log.Fatal("Topic not specified")
}
if *client && !*publish && !*subscribe {
log.Fatal("Specify whether to publish or subscribe")
}
if (*client || *interactive) && len(*servers) == 0 {
*servers = "localhost:8081"
}
var bclient mqclient.Client
var selecter mqclient.Selector
var resolvor mqclient.Resolver
switch *selector {
case "shard":
selecter = new(mqselector.Shard)
default:
selecter = new(mqselector.All)
}
switch *resolver {
case "dns":
resolvor = new(mqresolver.DNS)
default:
}
options := []mqclient.Option{
mqclient.WithResolver(resolvor),
mqclient.WithSelector(selecter),
mqclient.WithServers(strings.Split(*servers, ",")...),
mqclient.WithRetries(*retries),
}
switch *transport {
case "grpc":
bclient = mqgrpc.New(options...)
default:
bclient = mqclient.New(options...)
}
broker.Default = broker.New(
broker.Client(bclient),
broker.Persist(*persist),
broker.Proxy(*client || *proxy || *interactive),
)
}
func cli() {
wg := sync.WaitGroup{}
p := make(chan []byte, 1000)
d := map[string]time.Time{}
ttl := time.Millisecond * 10
tick := time.NewTicker(time.Second * 5)
// process publish
if *publish || *interactive {
wg.Add(1)
go func() {
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
if *interactive {
p <- scanner.Bytes()
}
broker.Publish(*topic, scanner.Bytes())
}
wg.Done()
}()
}
// subscribe?
if !(*subscribe || *interactive) {
wg.Wait()
return
}
// process subscribe
ch, err := broker.Subscribe(*topic)
if err != nil {
fmt.Println(err)
return
}
defer broker.Unsubscribe(*topic, ch)
for {
select {
// process sub event
case b := <-ch:
// skip if deduped
if t, ok := d[string(b)]; ok && time.Since(t) < ttl {
continue
}
d[string(b)] = time.Now()
fmt.Println(string(b))
// add dedupe entry
case b := <-p:
d[string(b)] = time.Now()
// flush deduper
case <-tick.C:
d = map[string]time.Time{}
}
}
wg.Wait()
}
func main() {
// handle client
if *client || *interactive {
cli()
return
}
// cleanup broker
defer broker.Default.Close()
options := []server.Option{
server.WithAddress(*address),
}
// proxy enabled
if *proxy {
log.Println("Proxy enabled")
}
// tls enabled
if len(*cert) > 0 && len(*key) > 0 {
log.Println("TLS Enabled")
options = append(options, server.WithTLS(*cert, *key))
}
var server server.Server
// now serve the transport
switch *transport {
case "grpc":
log.Println("GRPC transport enabled")
server = grpcsrv.New(options...)
default:
log.Println("HTTP transport enabled")
server = httpsrv.New(options...)
}
log.Println("MQ listening on", *address)
if err := server.Run(); err != nil {
log.Fatal(err)
}
}