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|
package main
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"strings"
"time"
)
const vclTemplate = `vcl {
app-socket-api %[1]s/var/run/app_ns_sockets/%[2]s
app-scope-global
app-scope-local
namespace-id %[2]s
namespace-secret %[2]s
use-mq-eventfd
}
`
const networkTopologyDir string = "topo-network/"
const containerTopologyDir string = "topo-containers/"
type Stanza struct {
content string
pad int
}
type ActionResult struct {
Err error
Desc string
ErrOutput string
StdOutput string
}
type JsonResult struct {
Code int
Desc string
ErrOutput string
StdOutput string
}
func startServerApp(running chan error, done chan struct{}, env []string) {
cmd := exec.Command("iperf3", "-4", "-s")
if env != nil {
cmd.Env = env
}
err := cmd.Start()
if err != nil {
msg := fmt.Errorf("failed to start iperf server: %v", err)
running <- msg
return
}
running <- nil
<-done
cmd.Process.Kill()
}
func startClientApp(ipAddress string, env []string, clnCh chan error, clnRes chan string) {
defer func() {
clnCh <- nil
}()
nTries := 0
for {
cmd := exec.Command("iperf3", "-c", ipAddress, "-u", "-l", "1460", "-b", "10g")
if env != nil {
cmd.Env = env
}
o, err := cmd.CombinedOutput()
if err != nil {
if nTries > 5 {
clnCh <- fmt.Errorf("failed to start client app '%s'.\n%s", err, o)
return
}
time.Sleep(1 * time.Second)
nTries++
continue
} else {
clnRes <- fmt.Sprintf("Client output: %s", o)
}
break
}
}
func assertFileSize(f1, f2 string) error {
fi1, err := os.Stat(f1)
if err != nil {
return err
}
fi2, err1 := os.Stat(f2)
if err1 != nil {
return err1
}
if fi1.Size() != fi2.Size() {
return fmt.Errorf("file sizes differ (%d vs %d)", fi1.Size(), fi2.Size())
}
return nil
}
func startHttpServer(running chan struct{}, done chan struct{}, addressPort, netNs string) {
cmd := newCommand([]string{"./http_server", addressPort}, netNs)
err := cmd.Start()
if err != nil {
fmt.Println("Failed to start http server")
return
}
running <- struct{}{}
<-done
cmd.Process.Kill()
}
func startWget(finished chan error, server_ip, port, query, netNs string) {
defer func() {
finished <- errors.New("wget error")
}()
cmd := newCommand([]string{"wget", "--timeout=10", "--no-proxy", "--tries=5", "-O", "/dev/null", server_ip + ":" + port + "/" + query},
netNs)
o, err := cmd.CombinedOutput()
if err != nil {
finished <- fmt.Errorf("wget error: '%v\n\n%s'", err, o)
return
} else if strings.Contains(string(o), "200 OK") == false {
finished <- fmt.Errorf("wget error: response not 200 OK")
return
}
finished <- nil
}
func (c *Stanza) newStanza(name string) *Stanza {
c.append("\n" + name + " {")
c.pad += 2
return c
}
func (c *Stanza) append(name string) *Stanza {
c.content += strings.Repeat(" ", c.pad)
c.content += name + "\n"
return c
}
func (c *Stanza) close() *Stanza {
c.content += "}\n"
c.pad -= 2
return c
}
func (s *Stanza) toString() string {
return s.content
}
func (s *Stanza) saveToFile(fileName string) error {
fo, err := os.Create(fileName)
if err != nil {
return err
}
defer fo.Close()
_, err = io.Copy(fo, strings.NewReader(s.content))
return err
}
|
