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|
package client
import (
"bufio"
"context"
"crypto/tls"
"crypto/x509"
_ "embed"
"fmt"
"log"
"net"
"os"
"strings"
"time"
"github.com/kyren223/eko/internal/packet"
)
//go:embed server.crt
var certPEM []byte
func Run() {
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(certPEM) {
log.Fatalln("failed to append server certificate")
}
tlsConfig := &tls.Config{
RootCAs: certPool,
ServerName: "localhost",
}
log.Println("client started, waiting for user input...")
for {
fmt.Print("> ")
input, _ := bufio.NewReader(os.Stdin).ReadString('\n')
input = strings.TrimSpace(input)
if input == ":q" || input == "exit" || input == "quit" {
break
}
err := processRequest(input, tlsConfig)
if err != nil {
log.Println(err)
}
}
}
func processRequest(input string, tlsConfig *tls.Config) error {
conn, err := tls.Dial("tcp4", ":7223", tlsConfig)
if err != nil {
return fmt.Errorf("error establishing connection with server: %v", err)
}
defer conn.Close()
log.Println("established connection with server:", conn.RemoteAddr().String())
if input == "SHOW" {
request := packet.GetMessagesMessage{}
var response packet.MessagesMessage
if err := SendAndReceive(conn, &request, &response); err != nil {
return err
}
log.Println("server response:", response.Messages)
} else {
request := packet.SendMessageMessage{Content: input}
var response packet.EkoMessage
if err := SendAndReceive(conn, &request, &response); err != nil {
return err
}
log.Println("server response:", response.Message)
}
return nil
}
func SendAndReceive(conn net.Conn, request packet.TypedMessage, response packet.TypedMessage) error {
encoder, err := packet.NewMsgPackEncoder(request)
if err != nil {
return fmt.Errorf("error encoding request: %v", err)
}
requestPacket := packet.NewPacket(encoder)
err = requestPacket.Into(conn)
if err != nil {
return fmt.Errorf("error sending request: %v", err)
}
log.Println("sent request to server")
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
out, outErr := packet.RunFramer(ctx, conn)
select {
case responsePacket := <-out:
if err := responsePacket.DecodePayload(response); err != nil {
return fmt.Errorf("error decoding response: %v", err)
}
case err := <-outErr:
return fmt.Errorf("error receiving response: %v", err)
}
return nil
}
|
