[NOD-1390] Add timeout to kaspactl (#929)

* [NOD-1390] Add timeout to kaspactl

* [NOD-1390] Fix grammar

cmd/kaspactl/config.go

@@ -1,18 +1,19 @@
 package main
 
 import (
+	"github.com/jessevdk/go-flags"
 	"github.com/kaspanet/kaspad/infrastructure/config"
 	"github.com/pkg/errors"
-
-	"github.com/jessevdk/go-flags"
 )
 
 var (
-	defaultRPCServer = "localhost"
+	defaultRPCServer        = "localhost"
+	defaultTimeout   uint64 = 30
 )
 
 type configFlags struct {
 	RPCServer   string `short:"s" long:"rpcserver" description:"RPC server to connect to"`
+	Timeout     uint64 `short:"t" long:"timeout" description:"Timeout for the request (in seconds)"`
 	RequestJSON string `description:"The request in JSON format"`
 	config.NetworkFlags
 }
@@ -20,6 +21,7 @@ type configFlags struct {
 func parseConfig() (*configFlags, error) {
 	cfg := &configFlags{
 		RPCServer: defaultRPCServer,
+		Timeout:   defaultTimeout,
 	}
 	parser := flags.NewParser(cfg, flags.PrintErrors|flags.HelpFlag)
 	args, err := parser.Parse()

cmd/kaspactl/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/kaspanet/kaspad/infrastructure/network/rpcclient/grpcclient"
 	"os"
+	"time"
 )
 
 func main() {
@@ -22,13 +23,26 @@ func main() {
 	}
 	defer client.Disconnect()
 
-	requestString := cfg.RequestJSON
-	responseString, err := client.PostJSON(requestString)
-	if err != nil {
-		printErrorAndExit(fmt.Sprintf("error posting the request to the RPC server: %s", err))
-	}
+	var responseString string
+	done := make(chan struct{})
 
-	fmt.Println(responseString)
+	go func() {
+		requestString := cfg.RequestJSON
+		var err error
+		responseString, err = client.PostJSON(requestString)
+		if err != nil {
+			printErrorAndExit(fmt.Sprintf("error posting the request to the RPC server: %s", err))
+		}
+		done <- struct{}{}
+	}()
+
+	timeout := time.Duration(cfg.Timeout) * time.Second
+	select {
+	case <-done:
+		fmt.Println(responseString)
+	case <-time.After(timeout):
+		printErrorAndExit(fmt.Sprintf("timeout of %s has been exceeded", timeout))
+	}
 }
 
 func printErrorAndExit(message string) {