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tcp.go
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tcp.go
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// Copyright 2020 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package driver
import (
"bufio"
"errors"
"fmt"
"io"
"log"
"net"
"strings"
"time"
)
type TCPServer struct {
lis net.Listener
Prefix string
}
var _ Step = &TCPServer{}
func (t *TCPServer) Run(p *Params) error {
var err error
t.lis, err = net.Listen("tcp", fmt.Sprintf("127.0.0.3:%d", p.Ports.BackendPort))
if err != nil {
return fmt.Errorf("failed to listen on %v", err)
}
go t.serve()
if err = waitForTCPServer(p.Ports.BackendPort); err != nil {
return err
}
return nil
}
func (t *TCPServer) Cleanup() {
t.lis.Close()
}
func (t *TCPServer) serve() {
for {
conn, err := t.lis.Accept()
if err != nil {
return
}
// pass an accepted connection to a handler goroutine
go handleConnection(conn, t.Prefix)
}
}
func waitForTCPServer(port uint16) error {
for i := 0; i < 30; i++ {
var conn net.Conn
var err error
conn, err = net.Dial("tcp", fmt.Sprintf("127.0.0.3:%d", port))
if err != nil {
log.Println("Will wait 200ms and try again.")
time.Sleep(200 * time.Millisecond)
continue
}
// send to socket
fmt.Fprintf(conn, "ping\n")
// listen for reply
message, err := bufio.NewReader(conn).ReadString('\n')
if err != nil {
log.Println("Will wait 200ms and try again.")
time.Sleep(200 * time.Millisecond)
continue
}
fmt.Print("Message from server: " + message)
return nil
}
return errors.New("timeout waiting for TCP server to be ready")
}
func handleConnection(conn net.Conn, prefix string) {
defer conn.Close()
reader := bufio.NewReader(conn)
for {
// read client request data
bytes, err := reader.ReadString('\n')
if err != nil {
if err != io.EOF {
log.Println("failed to read data, err:", err)
}
return
}
log.Printf("request: %s", bytes)
// prepend prefix and send as response
line := fmt.Sprintf("%s %s", prefix, bytes)
log.Printf("response: %s", line)
_, _ = conn.Write([]byte(line))
}
}
type TCPConnection struct{}
var _ Step = &TCPConnection{}
func (t *TCPConnection) Run(p *Params) error {
conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", p.Ports.ClientPort))
if err != nil {
return fmt.Errorf("failed to connect to tcp server: %v", err)
}
defer conn.Close()
// send to socket
fmt.Fprintf(conn, "world"+"\n")
// listen for reply
message, err := bufio.NewReader(conn).ReadString('\n')
if err != nil {
return fmt.Errorf("failed to read bytes from conn %v", err)
}
wantMessage := "hello world\n"
if message != wantMessage {
return fmt.Errorf("received bytes got %v want %v", message, wantMessage)
}
return nil
}
func (t *TCPConnection) Cleanup() {}
// TCPServerAcceptAndClose implements a TCP server
// which accepts the data and then closes the connection
// immediately without any response.
//
// The exception from this description is the "ping" data
// which is handled differently for checking if the server
// is already up.
type TCPServerAcceptAndClose struct {
lis net.Listener
}
var _ Step = &TCPServerAcceptAndClose{}
func (t *TCPServerAcceptAndClose) Run(p *Params) error {
var err error
t.lis, err = net.Listen("tcp", fmt.Sprintf(":%d", p.Ports.BackendPort))
if err != nil {
return fmt.Errorf("failed to listen on %v", err)
}
go t.serve()
if err = waitForTCPServer(p.Ports.BackendPort); err != nil {
return err
}
return nil
}
func (t *TCPServerAcceptAndClose) Cleanup() {
t.lis.Close()
}
func (t *TCPServerAcceptAndClose) serve() {
for {
conn, err := t.lis.Accept()
if err != nil {
return
}
go t.handleConnection(conn)
}
}
func (t *TCPServerAcceptAndClose) handleConnection(conn net.Conn) {
defer conn.Close()
reader := bufio.NewReader(conn)
bytes, err := reader.ReadString('\n')
if err != nil {
if err != io.EOF {
log.Println("failed to read data, err:", err)
}
return
}
bytes = strings.TrimSpace(bytes)
if strings.HasSuffix(bytes, "ping") {
log.Println("pinged - the TCP Server is available")
_, _ = conn.Write([]byte("alive\n"))
}
log.Println("received data. Closing the connection")
}
// InterceptedTCPConnection is a connection which expects
// the terminated connection (before the timeout occurs)
type InterceptedTCPConnection struct {
ReadTimeout time.Duration
}
var _ Step = &InterceptedTCPConnection{}
func (t *InterceptedTCPConnection) Run(p *Params) error {
conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", p.Ports.ClientPort))
if err != nil {
return fmt.Errorf("failed to connect to tcp server: %v", err)
}
defer conn.Close()
fmt.Fprintf(conn, "some data"+"\n")
err = conn.SetReadDeadline(time.Now().Add(t.ReadTimeout))
if err != nil {
return fmt.Errorf("failed to set read deadline: %v", err)
}
_, err = bufio.NewReader(conn).ReadString('\n')
if err != io.EOF {
return errors.New("the connection should be terminated")
}
return nil
}
func (t *InterceptedTCPConnection) Cleanup() {}