/
cluster-df.go
80 lines (66 loc) · 1.52 KB
/
cluster-df.go
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package main
import (
"flag"
"fmt"
"github.com/pebbe/zmq4"
"github.com/vmihailenco/msgpack"
"log"
"os"
"time"
)
// dummy request for REQ-ROUTER pattern
type Request struct {
Identity string
}
func RequestUpdateMessage() (buf []byte, err error) {
id := fmt.Sprintf("REQ %v", os.Getpid())
req := Request{id}
return msgpack.Marshal(&req)
}
func main() {
showTimePtr := flag.Bool("t", false, "show time of events")
flag.Parse()
cfg := LoadConfig()
request_attempts := 0
// ask for updates messages (REQ-ROUTER)
request_socket, err := zmq4.NewSocket(zmq4.REQ)
if err != nil {
log.Fatalf("Failed open Socket ZMQ: %s\n", err.Error())
panic(err)
}
defer request_socket.Close()
SocketAddr := "tcp://" + cfg.RouterIp + ":" + cfg.Ports.Clients
request_socket.Connect(SocketAddr)
for {
// request new update
msg, err := RequestUpdateMessage()
if err != nil {
log.Fatal("request messsage error:", err)
panic(err)
}
_, err = request_socket.SendBytes(msg, 0)
if err != nil {
log.Fatal("sending request messsage error:", err)
panic(err)
}
// response from cluster-top-server
s, err := request_socket.RecvBytes(0)
if err != nil {
log.Println(err)
time.Sleep(10 * time.Second)
request_attempts += 1
if request_attempts == 0 {
panic("too many request attempts yielding an error")
}
continue
}
var clus Cluster
err = msgpack.Unmarshal(s, &clus)
if err != nil {
panic(err)
}
clus.Sort()
clus.Print(*showTimePtr)
time.Sleep(time.Duration(cfg.Tick) * time.Second)
}
}