new e2e framework (#1835)

test/e2e/pkg/request/request.go

@@ -0,0 +1,31 @@
+package request
+
+import (
+	"fmt"
+	"net"
+	"time"
+)
+
+func SendTCPRequest(port int, content []byte, timeout time.Duration) (res string, err error) {
+	c, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", port))
+	if err != nil {
+		err = fmt.Errorf("connect to tcp server error: %v", err)
+		return
+	}
+	defer c.Close()
+
+	c.SetDeadline(time.Now().Add(timeout))
+	return sendTCPRequestByConn(c, content)
+}
+
+func sendTCPRequestByConn(c net.Conn, content []byte) (res string, err error) {
+	c.Write(content)
+
+	buf := make([]byte, 2048)
+	n, errRet := c.Read(buf)
+	if errRet != nil {
+		err = fmt.Errorf("read from tcp error: %v", errRet)
+		return
+	}
+	return string(buf[:n]), nil
+}