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clsrv.go
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clsrv.go
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package main
import "fmt"
import . "zmq"
import . "bytes"
import . "gonewrong"
import rt "runtime"
import "os"
import "strconv"
import "time"
func Server(ctx Context, ch chan bool, bchan chan bool, addr string) {
rt.LockOSThread()
defer rt.UnlockOSThread()
defer func() { ch <- true }()
srv, err := ctx.NewSocket(ZmqPair)
OkIf(err != nil, err)
defer srv.Close()
msg := srv.Provider().NewMessage()
buf := NewBuffer(make([]byte, 2))
defer msg.Close()
fmt.Println("server: About to bind server socket on ", addr)
err = srv.Bind(addr)
MayPanic(OkIf(err == nil, err))
bchan <- true
fmt.Println("server: Bound")
MayPanic(srv.Receive(msg, 0))
_, err = msg.WriteTo(buf)
if err != nil {
fmt.Println("server: Error: ", err)
}
fmt.Printf("server: Received '%v'\n", buf)
buf.Reset()
MayPanic(srv.Receive(msg, 0))
_, err = msg.WriteTo(buf)
if err != nil {
fmt.Println("server: Error: ", err)
}
fmt.Printf("server: Received '%v'\n", buf)
}
func Client(ctx Context, ch chan bool, tout int, addr string) {
rt.LockOSThread()
defer rt.UnlockOSThread()
defer func() { ch <- true }()
cl, err := ctx.NewSocket(ZmqPair)
OkIf(err != nil, err)
defer cl.Close()
buf := NewBufferString("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
msg := cl.Provider().NewMessage()
defer msg.Close()
fmt.Println("client: About to connect client socket on ", addr)
err = cl.Connect(addr)
MayPanic(OkIf(err == nil, err))
fmt.Println("client: Connected")
fmt.Printf("client: Sending '%v'\n", buf.String())
_, err = msg.ReadFrom(buf)
if err != nil {
fmt.Println("client: Error: ", err)
}
MayPanic(cl.Send(msg, 0))
buf.WriteString("XXX")
fmt.Printf("client: Sending '%v'\n", buf.String())
_, err = msg.ReadFrom(buf)
if err != nil {
fmt.Println("client: Error: ", err)
}
MayPanic(cl.Send(msg, 0))
// Give messages some time to actually get sent
// (If you forget this and defer close the socket,
// your message might not be transmitted at all)
fmt.Printf("client: Waiting for zmq to deliver\n")
time.Sleep((int64)(tout * 1e9))
}
func usage() {
fmt.Println(os.Args[0], "srv|cl|all cl-timeout(ignored if srv) zmqaddr")
os.Exit(1)
}
func main() {
prov := LibZmqProvider()
ctx, err := prov.NewContext(DefaultInitArgs())
OkIf(err != nil, err)
defer ctx.Close()
ch := make(chan bool)
bchan := make(chan bool)
if len(os.Args) != 4 {
usage()
} else {
mode := os.Args[1]
tout, err := strconv.Atoi(os.Args[2])
MayPanic(err)
addr := os.Args[3]
switch {
default:
usage()
case mode == "srv":
go Server(ctx, ch, bchan, addr)
<-bchan
case mode == "cl":
go Client(ctx, ch, tout, addr)
case mode == "all":
go Server(ctx, ch, bchan, addr)
<-bchan
go Client(ctx, ch, tout, addr)
<-ch
}
fmt.Println("main: Waiting to finish")
<-ch
time.Sleep((int64)(tout * 1e9))
}
}