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main.go
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main.go
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package main
import (
"fmt"
"math/rand"
"os"
"github.com/bradfitz/gomemcache/memcache"
"github.com/golang/protobuf/proto"
pb "github.com/lucidity-dev/bulletin/protobuf"
"nanomsg.org/go-mangos/protocol/rep"
"nanomsg.org/go-mangos/transport/ipc"
"nanomsg.org/go-mangos/transport/tcp"
)
func die(format string, v ...interface{}) {
fmt.Fprintln(os.Stderr, fmt.Sprintf(format, v...))
os.Exit(1)
}
func getUrl(mc *memcache.Client) string {
port := rand.Intn(59999) + 1
_, miss := mc.Get(string(port))
for miss == nil {
port = rand.Intn(59999) + 1
_, miss = mc.Get(string(port))
}
mc.Set(&memcache.Item{Key: string(port), Value: []byte("test")})
return fmt.Sprintf("tcp://127.0.0.1:%d", port)
}
func main() {
fmt.Println("Waiting for memcached connection")
mc := memcache.New("127.0.0.1:11211")
fmt.Println("Connected to memcached")
url := "tcp://127.0.0.1:40899"
sock, err := rep.NewSocket()
if err != nil {
die("can't start up server: %s", err)
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Listen(url); err != nil {
die("can't start up server: %s", err)
}
for {
msg, err := sock.Recv()
var body pb.Message
if err != nil {
die("bad request: %s", err)
}
proto.Unmarshal(msg, &body)
switch body.Cmd {
case pb.Message_HELP:
sock.Send([]byte("hello"))
case pb.Message_REGISTER:
fmt.Println("registering")
if _, hit := mc.Get(string(body.Args)); hit != nil {
link := getUrl(mc)
mc.Set(&memcache.Item{Key: string(body.Args), Value: []byte(link)})
//TODO: autogenerate URL with random socket
result := &pb.Topic{
Name: string(body.Args),
Url: link,
Err: "",
}
var res []byte
res, err = proto.Marshal(result)
if err != nil {
sock.Send([]byte("registering failed: data marshalling error"))
}
sock.Send(res)
} else {
result := &pb.Topic{
Name: "",
Url: "",
Err: "ERROR: Topic already registered",
}
var res []byte
res, err = proto.Marshal(result)
sock.Send(res)
}
case pb.Message_GET:
fmt.Println("getting")
if item, hit := mc.Get(string(body.Args)); hit == nil {
result := &pb.Topic{
Name: string(body.Args),
Url: string(item.Value),
Err: "",
}
var res []byte
res, err = proto.Marshal(result)
if err != nil {
sock.Send([]byte("getting failed: data marshalling error"))
}
sock.Send(res)
} else {
result := &pb.Topic{
Name: "",
Url: "",
Err: "ERROR: Topic not registered",
}
var res []byte
res, err = proto.Marshal(result)
sock.Send(res)
}
case pb.Message_FLUSH_ALL:
fmt.Println("flushing all")
err = mc.FlushAll()
if err != nil {
die("memecached error: %v", err)
}
sock.Send([]byte("FLUSHED ENTIRE CACHE"))
default:
sock.Send([]byte("INVALID REQUEST"))
}
//fmt.Println(body.Args)
}
}