cli/entry.go

@@ -0,0 +1,84 @@
+package cli
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/hamburghammer/rcon"
+)
+
+// Start a interactive connection. Uses the given reader and writer to inteact with the created connection.
+func Start(hostPort string, password string, in io.Reader, out io.Writer) {
+	remoteConsole, err := rcon.Dial(hostPort, password)
+	if err != nil {
+		log.Fatal("Failed to connect to RCON server", err)
+	}
+	defer remoteConsole.Close()
+
+	scanner := bufio.NewScanner(in)
+	out.Write([]byte("To quit the session type 'exit'.\n"))
+	out.Write([]byte("> "))
+	for scanner.Scan() {
+		cmd := scanner.Text()
+		if cmd == "exit" {
+			return
+		}
+
+		reqID, err := remoteConsole.Write(cmd)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "Failed to send command:", err.Error())
+			continue
+		}
+
+		resp, respID, err := remoteConsole.Read()
+		if err != nil {
+			if err == io.EOF {
+				return
+			}
+			fmt.Fprintln(os.Stderr, "Failed to read command:", err.Error())
+			continue
+		}
+
+		if reqID != respID {
+			fmt.Fprintln(out, "Weird. This response is for another request.")
+		}
+
+		fmt.Fprintln(out, resp)
+		out.Write([]byte("> "))
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintln(os.Stderr, "reading standard input:", err)
+	}
+}
+
+// Execute runs the given command against the remote console and writes the response into the writer.
+func Execute(hostPort string, password string, out io.Writer, command ...string) {
+	remoteConsole, err := rcon.Dial(hostPort, password)
+	if err != nil {
+		log.Fatal("Failed to connect to RCON server", err)
+	}
+	defer remoteConsole.Close()
+
+	preparedCmd := strings.Join(command, " ")
+	reqID, err := remoteConsole.Write(preparedCmd)
+
+	resp, respID, err := remoteConsole.Read()
+	if err != nil {
+		if err == io.EOF {
+			return
+		}
+		fmt.Fprintln(os.Stderr, "Failed to read command:", err.Error())
+		return
+	}
+
+	if reqID != respID {
+		fmt.Fprintln(out, "Weird. This response is for another request.")
+	}
+
+	fmt.Fprintln(out, resp)
+}

main.go

@@ -1,15 +1,11 @@
 package main
 
 import (
-	"bufio"
-	"errors"
 	"fmt"
-	"io"
 	"net"
 	"os"
-	"strings"
 
-	"github.com/hamburghammer/rcon"
+	"github.com/itzg/rcon-cli/cli"
 	flags "github.com/spf13/pflag"
 )
 
@@ -38,11 +34,7 @@ func main() {
 		return
 	}
 
-	err := run(strings.Join(commands, " "))
-	if err != nil {
-		fmt.Fprintln(os.Stderr, err.Error())
-		os.Exit(1)
-	}
+	run(commands...)
 }
 
 func parseArgs(args []string) ([]string, error) {
@@ -78,25 +70,14 @@ func loadEnvIfNotSet() {
 	}
 }
 
-func run(cmd string) error {
+func run(args ...string) {
 	hostPort := net.JoinHostPort(host, port)
-	remoteConsole, err := rcon.Dial(hostPort, password)
-	if err != nil {
-		return fmt.Errorf("failed to connect to RCON server: %w", err)
-	}
-	defer remoteConsole.Close()
 
-	if len(cmd) == 0 {
-		err = executeInteractive(remoteConsole)
+	if len(args) == 0 {
+		cli.Start(hostPort, password, os.Stdin, os.Stdout)
 	} else {
-		resp, err := execute(cmd, remoteConsole)
-		if err != nil {
-			return err
+		cli.Execute(hostPort, password, os.Stdout, args...)
 	}
-		fmt.Println(resp)
-	}
-
-	return err
 }
 
 func printHelp() {
@@ -119,49 +100,3 @@ EXAMPLES:
 	%sPORT=25575 rcon-cli stop
 `, envVarPrefix, envVarPrefix)
 }
-
-func executeInteractive(remoteConsole *rcon.RemoteConsole) error {
-	scanner := bufio.NewScanner(os.Stdin)
-	fmt.Println("To quit the session type 'exit'.")
-	for scanner.Scan() {
-		fmt.Print("> ")
-		cmd := scanner.Text()
-		if cmd == "exit" {
-			return nil
-		}
-		resp, err := execute(cmd, remoteConsole)
-		if err != nil {
-			return err
-		}
-
-		fmt.Println(resp)
-	}
-
-	if err := scanner.Err(); err != nil {
-		return fmt.Errorf("reading standard input: %w", err)
-	}
-
-	return nil
-}
-
-func execute(cmd string, remoteConsole *rcon.RemoteConsole) (string, error) {
-	resp := ""
-	reqID, err := remoteConsole.Write(cmd)
-	if err != nil {
-		return resp, fmt.Errorf("failed to send command: %w", err)
-	}
-
-	resp, respID, err := remoteConsole.Read()
-	if err != nil {
-		if err == io.EOF {
-			return resp, nil
-		}
-		return resp, fmt.Errorf("failed to read command: %w", err)
-	}
-
-	if reqID != respID {
-		return resp, errors.New("the response id didn't match the request id")
-	}
-
-	return resp, nil
-}