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callee.go
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callee.go
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package main
import (
"context"
"log"
"os"
"os/signal"
"github.com/dtegapp/nexus/v3/client"
"github.com/dtegapp/nexus/v3/examples/newclient"
"github.com/dtegapp/nexus/v3/wamp"
)
const procedureName = "sum"
func main() {
logger := log.New(os.Stdout, "CALLEE> ", 0)
// Connect callee client with requested socket type and serialization.
callee, err := newclient.NewClient(logger)
if err != nil {
logger.Fatal(err)
}
defer callee.Close()
// Register procedure "sum"
if err = callee.Register(procedureName, sum, nil); err != nil {
logger.Fatal("Failed to register procedure:", err)
}
logger.Println("Registered procedure", procedureName, "with router")
// Wait for CTRL-c or client close while handling remote procedure calls.
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
select {
case <-sigChan:
case <-callee.Done():
logger.Print("Router gone, exiting")
return // router gone, just exit
}
if err = callee.Unregister(procedureName); err != nil {
logger.Println("Failed to unregister procedure:", err)
}
}
func sum(ctx context.Context, inv *wamp.Invocation) client.InvokeResult {
log.Println("Calculating sum")
var sum int64
for _, arg := range inv.Arguments {
n, ok := wamp.AsInt64(arg)
if ok {
sum += n
}
}
return client.InvokeResult{Args: wamp.List{sum}}
}