extras/hs-test/infra/hst_suite.go - fdio/vpp - Gitiles

 package hst

 import (
 	"bufio"
 	"errors"
 	"flag"
 	"fmt"
 	"io"
 	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"time"

 	"github.com/onsi/gomega/gmeasure"
 	"gopkg.in/yaml.v3"

 	"github.com/edwarnicke/exechelper"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )

 const (
 	DEFAULT_NETWORK_NUM int = 1
 )

 var IsPersistent = flag.Bool("persist", false, "persists topology config")
 var IsVerbose = flag.Bool("verbose", false, "verbose test output")
 var IsUnconfiguring = flag.Bool("unconfigure", false, "remove topology")
 var IsVppDebug = flag.Bool("debug", false, "attach gdb to vpp")
 var NConfiguredCpus = flag.Int("cpus", 1, "number of CPUs assigned to vpp")
 var VppSourceFileDir = flag.String("vppsrc", "", "vpp source file directory")
 var SuiteTimeout time.Duration

 type HstSuite struct {
 	Containers        map[string]*Container
 	StartedContainers []*Container
 	Volumes           []string
 	NetConfigs        []NetConfig
 	NetInterfaces     map[string]*NetInterface
 	Ip4AddrAllocator  *Ip4AddressAllocator
 	TestIds           map[string]string
 	CpuAllocator      *CpuAllocatorT
 	CpuContexts       []*CpuContext
 	CpuPerVpp         int
 	Ppid              string
 	ProcessIndex      string
 	Logger            *log.Logger
 	LogFile           *os.File
 }

 func getTestFilename() string {
 	_, filename, _, _ := runtime.Caller(2)
 	return filepath.Base(filename)
 }

 func (s *HstSuite) SetupSuite() {
 	s.CreateLogger()
 	s.Log("Suite Setup")
 	RegisterFailHandler(func(message string, callerSkip ...int) {
 		s.HstFail()
 		Fail(message, callerSkip...)
 	})
 	var err error
 	s.Ppid = fmt.Sprint(os.Getppid())
 	// remove last number so we have space to prepend a process index (interfaces have a char limit)
 	s.Ppid = s.Ppid[:len(s.Ppid)-1]
 	s.ProcessIndex = fmt.Sprint(GinkgoParallelProcess())
 	s.CpuAllocator, err = CpuAllocator()
 	if err != nil {
 		Fail("failed to init cpu allocator: " + fmt.Sprint(err))
 	}
 	s.CpuPerVpp = *NConfiguredCpus
 }

 func (s *HstSuite) AllocateCpus() []int {
 	cpuCtx, err := s.CpuAllocator.Allocate(len(s.StartedContainers), s.CpuPerVpp)
 	s.AssertNil(err)
 	s.AddCpuContext(cpuCtx)
 	return cpuCtx.cpus
 }

 func (s *HstSuite) AddCpuContext(cpuCtx *CpuContext) {
 	s.CpuContexts = append(s.CpuContexts, cpuCtx)
 }

 func (s *HstSuite) TearDownSuite() {
 	defer s.LogFile.Close()
 	s.Log("Suite Teardown")
 	s.UnconfigureNetworkTopology()
 }

 func (s *HstSuite) TearDownTest() {
 	s.Log("Test Teardown")
 	if *IsPersistent {
 		return
 	}
 	s.ResetContainers()
 	s.RemoveVolumes()
 	s.Ip4AddrAllocator.DeleteIpAddresses()
 }

 func (s *HstSuite) SkipIfUnconfiguring() {
 	if *IsUnconfiguring {
 		s.Skip("skipping to unconfigure")
 	}
 }

 func (s *HstSuite) SetupTest() {
 	s.Log("Test Setup")
 	s.StartedContainers = s.StartedContainers[:0]
 	s.SkipIfUnconfiguring()
 	s.SetupVolumes()
 	s.SetupContainers()
 }

 func (s *HstSuite) SetupVolumes() {
 	for _, volume := range s.Volumes {
 		cmd := "docker volume create --name=" + volume
 		s.Log(cmd)
 		exechelper.Run(cmd)
 	}
 }

 func (s *HstSuite) SetupContainers() {
 	for _, container := range s.Containers {
 		if !container.IsOptional {
 			container.Run()
 		}
 	}
 }

 func (s *HstSuite) LogVppInstance(container *Container, maxLines int) {
 	if container.VppInstance == nil {
 		return
 	}

 	logSource := container.GetHostWorkDir() + defaultLogFilePath
 	file, err := os.Open(logSource)

 	if err != nil {
 		return
 	}
 	defer file.Close()

 	scanner := bufio.NewScanner(file)
 	var lines []string
 	var counter int

 	for scanner.Scan() {
 		lines = append(lines, scanner.Text())
 		counter++
 		if counter > maxLines {
 			lines = lines[1:]
 			counter--
 		}
 	}

 	s.Log("vvvvvvvvvvvvvvv " + container.Name + " [VPP instance]:")
 	for _, line := range lines {
 		s.Log(line)
 	}
 	s.Log("^^^^^^^^^^^^^^^\n\n")
 }

 func (s *HstSuite) HstFail() {
 	for _, container := range s.StartedContainers {
 		out, err := container.log(20)
 		if err != nil {
 			s.Log("An error occured while obtaining '" + container.Name + "' container logs: " + fmt.Sprint(err))
 			s.Log("The container might not be running - check logs in " + container.getLogDirPath())
 			continue
 		}
 		s.Log("\nvvvvvvvvvvvvvvv " +
 			container.Name + ":\n" +
 			out +
 			"^^^^^^^^^^^^^^^\n\n")
 		s.LogVppInstance(container, 20)
 	}
 }

 func (s *HstSuite) AssertNil(object interface{}, msgAndArgs ...interface{}) {
 	Expect(object).To(BeNil(), msgAndArgs...)
 }

 func (s *HstSuite) AssertNotNil(object interface{}, msgAndArgs ...interface{}) {
 	Expect(object).ToNot(BeNil(), msgAndArgs...)
 }

 func (s *HstSuite) AssertEqual(expected, actual interface{}, msgAndArgs ...interface{}) {
 	Expect(actual).To(Equal(expected), msgAndArgs...)
 }

 func (s *HstSuite) AssertNotEqual(expected, actual interface{}, msgAndArgs ...interface{}) {
 	Expect(actual).ToNot(Equal(expected), msgAndArgs...)
 }

 func (s *HstSuite) AssertContains(testString, contains interface{}, msgAndArgs ...interface{}) {
 	Expect(testString).To(ContainSubstring(fmt.Sprint(contains)), msgAndArgs...)
 }

 func (s *HstSuite) AssertNotContains(testString, contains interface{}, msgAndArgs ...interface{}) {
 	Expect(testString).ToNot(ContainSubstring(fmt.Sprint(contains)), msgAndArgs...)
 }

 func (s *HstSuite) AssertNotEmpty(object interface{}, msgAndArgs ...interface{}) {
 	Expect(object).ToNot(BeEmpty(), msgAndArgs...)
 }

 func (s *HstSuite) CreateLogger() {
 	suiteName := s.GetCurrentSuiteName()
 	var err error
 	s.LogFile, err = os.Create("summary/" + suiteName + ".log")
 	if err != nil {
 		Fail("Unable to create log file.")
 	}
 	s.Logger = log.New(io.Writer(s.LogFile), "", log.LstdFlags)
 }

 // Logs to files by default, logs to stdout when VERBOSE=true with GinkgoWriter
 // to keep console tidy
 func (s *HstSuite) Log(arg any) {
 	logs := strings.Split(fmt.Sprint(arg), "\n")
 	for _, line := range logs {
 		s.Logger.Println(line)
 	}
 	if *IsVerbose {
 		GinkgoWriter.Println(arg)
 	}
 }

 func (s *HstSuite) Skip(args string) {
 	Skip(args)
 }

 func (s *HstSuite) SkipIfMultiWorker(args ...any) {
 	if *NConfiguredCpus > 1 {
 		s.Skip("test case not supported with multiple vpp workers")
 	}
 }

 func (s *HstSuite) SkipUnlessExtendedTestsBuilt() {
 	imageName := "hs-test/nginx-http3"

 	cmd := exec.Command("docker", "images", imageName)
 	byteOutput, err := cmd.CombinedOutput()
 	if err != nil {
 		s.Log("error while searching for docker image")
 		return
 	}
 	if !strings.Contains(string(byteOutput), imageName) {
 		s.Skip("extended tests not built")
 	}
 }

 func (s *HstSuite) ResetContainers() {
 	for _, container := range s.StartedContainers {
 		container.stop()
 		exechelper.Run("docker rm " + container.Name)
 	}
 }

 func (s *HstSuite) RemoveVolumes() {
 	for _, volumeName := range s.Volumes {
 		cmd := "docker volume rm " + volumeName
 		exechelper.Run(cmd)
 		os.RemoveAll(volumeName)
 	}
 }

 func (s *HstSuite) GetNetNamespaceByName(name string) string {
 	return s.ProcessIndex + name + s.Ppid
 }

 func (s *HstSuite) GetInterfaceByName(name string) *NetInterface {
 	return s.NetInterfaces[s.ProcessIndex+name+s.Ppid]
 }

 func (s *HstSuite) GetContainerByName(name string) *Container {
 	return s.Containers[s.ProcessIndex+name+s.Ppid]
 }

 /*
  * Create a copy and return its address, so that individial tests which call this
  * are not able to modify the original container and affect other tests by doing that
  */
 func (s *HstSuite) GetTransientContainerByName(name string) *Container {
 	containerCopy := *s.Containers[s.ProcessIndex+name+s.Ppid]
 	return &containerCopy
 }

 func (s *HstSuite) LoadContainerTopology(topologyName string) {
 	data, err := os.ReadFile(containerTopologyDir + topologyName + ".yaml")
 	if err != nil {
 		Fail("read error: " + fmt.Sprint(err))
 	}
 	var yamlTopo YamlTopology
 	err = yaml.Unmarshal(data, &yamlTopo)
 	if err != nil {
 		Fail("unmarshal error: " + fmt.Sprint(err))
 	}

 	for _, elem := range yamlTopo.Volumes {
 		volumeMap := elem["volume"].(VolumeConfig)
 		hostDir := volumeMap["host-dir"].(string)
 		workingVolumeDir := logDir + s.GetCurrentTestName() + volumeDir
 		volDirReplacer := strings.NewReplacer("$HST_VOLUME_DIR", workingVolumeDir)
 		hostDir = volDirReplacer.Replace(hostDir)
 		s.Volumes = append(s.Volumes, hostDir)
 	}

 	s.Containers = make(map[string]*Container)
 	for _, elem := range yamlTopo.Containers {
 		newContainer, err := newContainer(s, elem)
 		newContainer.Suite = s
 		newContainer.Name = newContainer.Suite.ProcessIndex + newContainer.Name + newContainer.Suite.Ppid
 		if err != nil {
 			Fail("container config error: " + fmt.Sprint(err))
 		}
 		s.Containers[newContainer.Name] = newContainer
 	}
 }

 func (s *HstSuite) LoadNetworkTopology(topologyName string) {
 	data, err := os.ReadFile(networkTopologyDir + topologyName + ".yaml")
 	if err != nil {
 		Fail("read error: " + fmt.Sprint(err))
 	}
 	var yamlTopo YamlTopology
 	err = yaml.Unmarshal(data, &yamlTopo)
 	if err != nil {
 		Fail("unmarshal error: " + fmt.Sprint(err))
 	}

 	s.Ip4AddrAllocator = NewIp4AddressAllocator()
 	s.NetInterfaces = make(map[string]*NetInterface)

 	for _, elem := range yamlTopo.Devices {
 		if _, ok := elem["name"]; ok {
 			elem["name"] = s.ProcessIndex + elem["name"].(string) + s.Ppid
 		}

 		if peer, ok := elem["peer"].(NetDevConfig); ok {
 			if peer["name"].(string) != "" {
 				peer["name"] = s.ProcessIndex + peer["name"].(string) + s.Ppid
 			}
 			if _, ok := peer["netns"]; ok {
 				peer["netns"] = s.ProcessIndex + peer["netns"].(string) + s.Ppid
 			}
 		}

 		if _, ok := elem["netns"]; ok {
 			elem["netns"] = s.ProcessIndex + elem["netns"].(string) + s.Ppid
 		}

 		if _, ok := elem["interfaces"]; ok {
 			interfaceCount := len(elem["interfaces"].([]interface{}))
 			for i := 0; i < interfaceCount; i++ {
 				elem["interfaces"].([]interface{})[i] = s.ProcessIndex + elem["interfaces"].([]interface{})[i].(string) + s.Ppid
 			}
 		}

 		switch elem["type"].(string) {
 		case NetNs:
 			{
 				if namespace, err := newNetNamespace(elem); err == nil {
 					s.NetConfigs = append(s.NetConfigs, &namespace)
 				} else {
 					Fail("network config error: " + fmt.Sprint(err))
 				}
 			}
 		case Veth, Tap:
 			{
 				if netIf, err := newNetworkInterface(elem, s.Ip4AddrAllocator); err == nil {
 					s.NetConfigs = append(s.NetConfigs, netIf)
 					s.NetInterfaces[netIf.Name()] = netIf
 				} else {
 					Fail("network config error: " + fmt.Sprint(err))
 				}
 			}
 		case Bridge:
 			{
 				if bridge, err := newBridge(elem); err == nil {
 					s.NetConfigs = append(s.NetConfigs, &bridge)
 				} else {
 					Fail("network config error: " + fmt.Sprint(err))
 				}
 			}
 		}
 	}
 }

 func (s *HstSuite) ConfigureNetworkTopology(topologyName string) {
 	s.LoadNetworkTopology(topologyName)

 	if *IsUnconfiguring {
 		return
 	}

 	for _, nc := range s.NetConfigs {
 		s.Log(nc.Name())
 		if err := nc.configure(); err != nil {
 			Fail("Network config error: " + fmt.Sprint(err))
 		}
 	}
 }

 func (s *HstSuite) UnconfigureNetworkTopology() {
 	if *IsPersistent {
 		return
 	}
 	for _, nc := range s.NetConfigs {
 		nc.unconfigure()
 	}
 }

 func (s *HstSuite) GetTestId() string {
 	testName := s.GetCurrentTestName()

 	if s.TestIds == nil {
 		s.TestIds = map[string]string{}
 	}

 	if _, ok := s.TestIds[testName]; !ok {
 		s.TestIds[testName] = time.Now().Format("2006-01-02_15-04-05")
 	}

 	return s.TestIds[testName]
 }

 func (s *HstSuite) GetCurrentTestName() string {
 	return strings.Split(CurrentSpecReport().LeafNodeText, "/")[1]
 }

 func (s *HstSuite) GetCurrentSuiteName() string {
 	return CurrentSpecReport().ContainerHierarchyTexts[0]
 }

 // Returns last 3 digits of PID + Ginkgo process index as the 4th digit
 func (s *HstSuite) GetPortFromPpid() string {
 	port := s.Ppid
 	for len(port) < 3 {
 		port += "0"
 	}
 	return port[len(port)-3:] + s.ProcessIndex
 }

 func (s *HstSuite) StartServerApp(running chan error, done chan struct{}, env []string) {
 	cmd := exec.Command("iperf3", "-4", "-s", "-p", s.GetPortFromPpid())
 	if env != nil {
 		cmd.Env = env
 	}
 	s.Log(cmd)
 	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 (s *HstSuite) 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", "-p", s.GetPortFromPpid())
 		if env != nil {
 			cmd.Env = env
 		}
 		s.Log(cmd)
 		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 (s *HstSuite) StartHttpServer(running chan struct{}, done chan struct{}, addressPort, netNs string) {
 	cmd := newCommand([]string{"./http_server", addressPort, s.Ppid, s.ProcessIndex}, netNs)
 	err := cmd.Start()
 	s.Log(cmd)
 	if err != nil {
 		s.Log("Failed to start http server: " + fmt.Sprint(err))
 		return
 	}
 	running <- struct{}{}
 	<-done
 	cmd.Process.Kill()
 }

 func (s *HstSuite) 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)
 	s.Log(cmd)
 	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") {
 		finished <- fmt.Errorf("wget error: response not 200 OK")
 		return
 	}
 	finished <- nil
 }

 /*
 runBenchmark creates Gomega's experiment with the passed-in name and samples the passed-in callback repeatedly (samplesNum times),
 passing in suite context, experiment and your data.

 You can also instruct runBenchmark to run with multiple concurrent workers.
 You can record multiple named measurements (float64 or duration) within passed-in callback.
 runBenchmark then produces report to show statistical distribution of measurements.
 */
 func (s *HstSuite) RunBenchmark(name string, samplesNum, parallelNum int, callback func(s *HstSuite, e *gmeasure.Experiment, data interface{}), data interface{}) {
 	experiment := gmeasure.NewExperiment(name)

 	experiment.Sample(func(idx int) {
 		defer GinkgoRecover()
 		callback(s, experiment, data)
 	}, gmeasure.SamplingConfig{N: samplesNum, NumParallel: parallelNum})
 	AddReportEntry(experiment.Name, experiment)
 }
	package hst

	import (
	"bufio"
	"errors"
	"flag"
	"fmt"
	"io"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"strings"
	"time"

	"github.com/onsi/gomega/gmeasure"
	"gopkg.in/yaml.v3"

	"github.com/edwarnicke/exechelper"
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	)

	const (
	DEFAULT_NETWORK_NUM int = 1
	)

	var IsPersistent = flag.Bool("persist", false, "persists topology config")
	var IsVerbose = flag.Bool("verbose", false, "verbose test output")
	var IsUnconfiguring = flag.Bool("unconfigure", false, "remove topology")
	var IsVppDebug = flag.Bool("debug", false, "attach gdb to vpp")
	var NConfiguredCpus = flag.Int("cpus", 1, "number of CPUs assigned to vpp")
	var VppSourceFileDir = flag.String("vppsrc", "", "vpp source file directory")
	var SuiteTimeout time.Duration

	type HstSuite struct {
	Containers map[string]*Container
	StartedContainers []*Container
	Volumes []string
	NetConfigs []NetConfig
	NetInterfaces map[string]*NetInterface
	Ip4AddrAllocator *Ip4AddressAllocator
	TestIds map[string]string
	CpuAllocator *CpuAllocatorT
	CpuContexts []*CpuContext
	CpuPerVpp int
	Ppid string
	ProcessIndex string
	Logger *log.Logger
	LogFile *os.File
	}

	func getTestFilename() string {
	_, filename, _, _ := runtime.Caller(2)
	return filepath.Base(filename)
	}

	func (s *HstSuite) SetupSuite() {
	s.CreateLogger()
	s.Log("Suite Setup")
	RegisterFailHandler(func(message string, callerSkip ...int) {
	s.HstFail()
	Fail(message, callerSkip...)
	})
	var err error
	s.Ppid = fmt.Sprint(os.Getppid())
	// remove last number so we have space to prepend a process index (interfaces have a char limit)
	s.Ppid = s.Ppid[:len(s.Ppid)-1]
	s.ProcessIndex = fmt.Sprint(GinkgoParallelProcess())
	s.CpuAllocator, err = CpuAllocator()
	if err != nil {
	Fail("failed to init cpu allocator: " + fmt.Sprint(err))
	}
	s.CpuPerVpp = *NConfiguredCpus
	}

	func (s *HstSuite) AllocateCpus() []int {
	cpuCtx, err := s.CpuAllocator.Allocate(len(s.StartedContainers), s.CpuPerVpp)
	s.AssertNil(err)
	s.AddCpuContext(cpuCtx)
	return cpuCtx.cpus
	}

	func (s HstSuite) AddCpuContext(cpuCtx CpuContext) {
	s.CpuContexts = append(s.CpuContexts, cpuCtx)
	}

	func (s *HstSuite) TearDownSuite() {
	defer s.LogFile.Close()
	s.Log("Suite Teardown")
	s.UnconfigureNetworkTopology()
	}

	func (s *HstSuite) TearDownTest() {
	s.Log("Test Teardown")
	if *IsPersistent {
	return
	}
	s.ResetContainers()
	s.RemoveVolumes()
	s.Ip4AddrAllocator.DeleteIpAddresses()
	}

	func (s *HstSuite) SkipIfUnconfiguring() {
	if *IsUnconfiguring {
	s.Skip("skipping to unconfigure")
	}
	}

	func (s *HstSuite) SetupTest() {
	s.Log("Test Setup")
	s.StartedContainers = s.StartedContainers[:0]
	s.SkipIfUnconfiguring()
	s.SetupVolumes()
	s.SetupContainers()
	}

	func (s *HstSuite) SetupVolumes() {
	for _, volume := range s.Volumes {
	cmd := "docker volume create --name=" + volume
	s.Log(cmd)
	exechelper.Run(cmd)
	}
	}

	func (s *HstSuite) SetupContainers() {
	for _, container := range s.Containers {
	if !container.IsOptional {
	container.Run()
	}
	}
	}

	func (s HstSuite) LogVppInstance(container Container, maxLines int) {
	if container.VppInstance == nil {
	return
	}

	logSource := container.GetHostWorkDir() + defaultLogFilePath
	file, err := os.Open(logSource)

	if err != nil {
	return
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	var lines []string
	var counter int

	for scanner.Scan() {
	lines = append(lines, scanner.Text())
	counter++
	if counter > maxLines {
	lines = lines[1:]
	counter--
	}
	}

	s.Log("vvvvvvvvvvvvvvv " + container.Name + " [VPP instance]:")
	for _, line := range lines {
	s.Log(line)
	}
	s.Log("^^^^^^^^^^^^^^^\n\n")
	}

	func (s *HstSuite) HstFail() {
	for _, container := range s.StartedContainers {
	out, err := container.log(20)
	if err != nil {
	s.Log("An error occured while obtaining '" + container.Name + "' container logs: " + fmt.Sprint(err))
	s.Log("The container might not be running - check logs in " + container.getLogDirPath())
	continue
	}
	s.Log("\nvvvvvvvvvvvvvvv " +
	container.Name + ":\n" +
	out +
	"^^^^^^^^^^^^^^^\n\n")
	s.LogVppInstance(container, 20)
	}
	}

	func (s *HstSuite) AssertNil(object interface{}, msgAndArgs ...interface{}) {
	Expect(object).To(BeNil(), msgAndArgs...)
	}

	func (s *HstSuite) AssertNotNil(object interface{}, msgAndArgs ...interface{}) {
	Expect(object).ToNot(BeNil(), msgAndArgs...)
	}

	func (s *HstSuite) AssertEqual(expected, actual interface{}, msgAndArgs ...interface{}) {
	Expect(actual).To(Equal(expected), msgAndArgs...)
	}

	func (s *HstSuite) AssertNotEqual(expected, actual interface{}, msgAndArgs ...interface{}) {
	Expect(actual).ToNot(Equal(expected), msgAndArgs...)
	}

	func (s *HstSuite) AssertContains(testString, contains interface{}, msgAndArgs ...interface{}) {
	Expect(testString).To(ContainSubstring(fmt.Sprint(contains)), msgAndArgs...)
	}

	func (s *HstSuite) AssertNotContains(testString, contains interface{}, msgAndArgs ...interface{}) {
	Expect(testString).ToNot(ContainSubstring(fmt.Sprint(contains)), msgAndArgs...)
	}

	func (s *HstSuite) AssertNotEmpty(object interface{}, msgAndArgs ...interface{}) {
	Expect(object).ToNot(BeEmpty(), msgAndArgs...)
	}

	func (s *HstSuite) CreateLogger() {
	suiteName := s.GetCurrentSuiteName()
	var err error
	s.LogFile, err = os.Create("summary/" + suiteName + ".log")
	if err != nil {
	Fail("Unable to create log file.")
	}
	s.Logger = log.New(io.Writer(s.LogFile), "", log.LstdFlags)
	}

	// Logs to files by default, logs to stdout when VERBOSE=true with GinkgoWriter
	// to keep console tidy
	func (s *HstSuite) Log(arg any) {
	logs := strings.Split(fmt.Sprint(arg), "\n")
	for _, line := range logs {
	s.Logger.Println(line)
	}
	if *IsVerbose {
	GinkgoWriter.Println(arg)
	}
	}

	func (s *HstSuite) Skip(args string) {
	Skip(args)
	}

	func (s *HstSuite) SkipIfMultiWorker(args ...any) {
	if *NConfiguredCpus > 1 {
	s.Skip("test case not supported with multiple vpp workers")
	}
	}

	func (s *HstSuite) SkipUnlessExtendedTestsBuilt() {
	imageName := "hs-test/nginx-http3"

	cmd := exec.Command("docker", "images", imageName)
	byteOutput, err := cmd.CombinedOutput()
	if err != nil {
	s.Log("error while searching for docker image")
	return
	}
	if !strings.Contains(string(byteOutput), imageName) {
	s.Skip("extended tests not built")
	}
	}

	func (s *HstSuite) ResetContainers() {
	for _, container := range s.StartedContainers {
	container.stop()
	exechelper.Run("docker rm " + container.Name)
	}
	}

	func (s *HstSuite) RemoveVolumes() {
	for _, volumeName := range s.Volumes {
	cmd := "docker volume rm " + volumeName
	exechelper.Run(cmd)
	os.RemoveAll(volumeName)
	}
	}

	func (s *HstSuite) GetNetNamespaceByName(name string) string {
	return s.ProcessIndex + name + s.Ppid
	}

	func (s HstSuite) GetInterfaceByName(name string) NetInterface {
	return s.NetInterfaces[s.ProcessIndex+name+s.Ppid]
	}

	func (s HstSuite) GetContainerByName(name string) Container {
	return s.Containers[s.ProcessIndex+name+s.Ppid]
	}

	/*
	* Create a copy and return its address, so that individial tests which call this
	* are not able to modify the original container and affect other tests by doing that
	*/
	func (s HstSuite) GetTransientContainerByName(name string) Container {
	containerCopy := *s.Containers[s.ProcessIndex+name+s.Ppid]
	return &containerCopy
	}

	func (s *HstSuite) LoadContainerTopology(topologyName string) {
	data, err := os.ReadFile(containerTopologyDir + topologyName + ".yaml")
	if err != nil {
	Fail("read error: " + fmt.Sprint(err))
	}
	var yamlTopo YamlTopology
	err = yaml.Unmarshal(data, &yamlTopo)
	if err != nil {
	Fail("unmarshal error: " + fmt.Sprint(err))
	}

	for _, elem := range yamlTopo.Volumes {
	volumeMap := elem["volume"].(VolumeConfig)
	hostDir := volumeMap["host-dir"].(string)
	workingVolumeDir := logDir + s.GetCurrentTestName() + volumeDir
	volDirReplacer := strings.NewReplacer("$HST_VOLUME_DIR", workingVolumeDir)
	hostDir = volDirReplacer.Replace(hostDir)
	s.Volumes = append(s.Volumes, hostDir)
	}

	s.Containers = make(map[string]*Container)
	for _, elem := range yamlTopo.Containers {
	newContainer, err := newContainer(s, elem)
	newContainer.Suite = s
	newContainer.Name = newContainer.Suite.ProcessIndex + newContainer.Name + newContainer.Suite.Ppid
	if err != nil {
	Fail("container config error: " + fmt.Sprint(err))
	}
	s.Containers[newContainer.Name] = newContainer
	}
	}

	func (s *HstSuite) LoadNetworkTopology(topologyName string) {
	data, err := os.ReadFile(networkTopologyDir + topologyName + ".yaml")
	if err != nil {
	Fail("read error: " + fmt.Sprint(err))
	}
	var yamlTopo YamlTopology
	err = yaml.Unmarshal(data, &yamlTopo)
	if err != nil {
	Fail("unmarshal error: " + fmt.Sprint(err))
	}

	s.Ip4AddrAllocator = NewIp4AddressAllocator()
	s.NetInterfaces = make(map[string]*NetInterface)

	for _, elem := range yamlTopo.Devices {
	if _, ok := elem["name"]; ok {
	elem["name"] = s.ProcessIndex + elem["name"].(string) + s.Ppid
	}

	if peer, ok := elem["peer"].(NetDevConfig); ok {
	if peer["name"].(string) != "" {
	peer["name"] = s.ProcessIndex + peer["name"].(string) + s.Ppid
	}
	if _, ok := peer["netns"]; ok {
	peer["netns"] = s.ProcessIndex + peer["netns"].(string) + s.Ppid
	}
	}

	if _, ok := elem["netns"]; ok {
	elem["netns"] = s.ProcessIndex + elem["netns"].(string) + s.Ppid
	}

	if _, ok := elem["interfaces"]; ok {
	interfaceCount := len(elem["interfaces"].([]interface{}))
	for i := 0; i < interfaceCount; i++ {
	elem["interfaces"].([]interface{})[i] = s.ProcessIndex + elem["interfaces"].([]interface{})[i].(string) + s.Ppid
	}
	}

	switch elem["type"].(string) {
	case NetNs:
	{
	if namespace, err := newNetNamespace(elem); err == nil {
	s.NetConfigs = append(s.NetConfigs, &namespace)
	} else {
	Fail("network config error: " + fmt.Sprint(err))
	}
	}
	case Veth, Tap:
	{
	if netIf, err := newNetworkInterface(elem, s.Ip4AddrAllocator); err == nil {
	s.NetConfigs = append(s.NetConfigs, netIf)
	s.NetInterfaces[netIf.Name()] = netIf
	} else {
	Fail("network config error: " + fmt.Sprint(err))
	}
	}
	case Bridge:
	{
	if bridge, err := newBridge(elem); err == nil {
	s.NetConfigs = append(s.NetConfigs, &bridge)
	} else {
	Fail("network config error: " + fmt.Sprint(err))
	}
	}
	}
	}
	}

	func (s *HstSuite) ConfigureNetworkTopology(topologyName string) {
	s.LoadNetworkTopology(topologyName)

	if *IsUnconfiguring {
	return
	}

	for _, nc := range s.NetConfigs {
	s.Log(nc.Name())
	if err := nc.configure(); err != nil {
	Fail("Network config error: " + fmt.Sprint(err))
	}
	}
	}

	func (s *HstSuite) UnconfigureNetworkTopology() {
	if *IsPersistent {
	return
	}
	for _, nc := range s.NetConfigs {
	nc.unconfigure()
	}
	}

	func (s *HstSuite) GetTestId() string {
	testName := s.GetCurrentTestName()

	if s.TestIds == nil {
	s.TestIds = map[string]string{}
	}

	if _, ok := s.TestIds[testName]; !ok {
	s.TestIds[testName] = time.Now().Format("2006-01-02_15-04-05")
	}

	return s.TestIds[testName]
	}

	func (s *HstSuite) GetCurrentTestName() string {
	return strings.Split(CurrentSpecReport().LeafNodeText, "/")[1]
	}

	func (s *HstSuite) GetCurrentSuiteName() string {
	return CurrentSpecReport().ContainerHierarchyTexts[0]
	}

	// Returns last 3 digits of PID + Ginkgo process index as the 4th digit
	func (s *HstSuite) GetPortFromPpid() string {
	port := s.Ppid
	for len(port) < 3 {
	port += "0"
	}
	return port[len(port)-3:] + s.ProcessIndex
	}

	func (s *HstSuite) StartServerApp(running chan error, done chan struct{}, env []string) {
	cmd := exec.Command("iperf3", "-4", "-s", "-p", s.GetPortFromPpid())
	if env != nil {
	cmd.Env = env
	}
	s.Log(cmd)
	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 (s *HstSuite) 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", "-p", s.GetPortFromPpid())
	if env != nil {
	cmd.Env = env
	}
	s.Log(cmd)
	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 (s *HstSuite) StartHttpServer(running chan struct{}, done chan struct{}, addressPort, netNs string) {
	cmd := newCommand([]string{"./http_server", addressPort, s.Ppid, s.ProcessIndex}, netNs)
	err := cmd.Start()
	s.Log(cmd)
	if err != nil {
	s.Log("Failed to start http server: " + fmt.Sprint(err))
	return
	}
	running <- struct{}{}
	<-done
	cmd.Process.Kill()
	}

	func (s *HstSuite) 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)
	s.Log(cmd)
	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") {
	finished <- fmt.Errorf("wget error: response not 200 OK")
	return
	}
	finished <- nil
	}

	/*
	runBenchmark creates Gomega's experiment with the passed-in name and samples the passed-in callback repeatedly (samplesNum times),
	passing in suite context, experiment and your data.

	You can also instruct runBenchmark to run with multiple concurrent workers.
	You can record multiple named measurements (float64 or duration) within passed-in callback.
	runBenchmark then produces report to show statistical distribution of measurements.
	*/
	func (s HstSuite) RunBenchmark(name string, samplesNum, parallelNum int, callback func(s HstSuite, e *gmeasure.Experiment, data interface{}), data interface{}) {
	experiment := gmeasure.NewExperiment(name)

	experiment.Sample(func(idx int) {
	defer GinkgoRecover()
	callback(s, experiment, data)
	}, gmeasure.SamplingConfig{N: samplesNum, NumParallel: parallelNum})
	AddReportEntry(experiment.Name, experiment)
	}