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package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"github.com/edwarnicke/exechelper"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/suite"
"gopkg.in/yaml.v3"
)
const (
defaultNetworkNumber int = 1
)
var IsPersistent = flag.Bool("persist", false, "persists topology config")
var IsVerbose = flag.Bool("verbose", false, "verbose test output")
type HstSuite struct {
suite.Suite
containers map[string]*Container
volumes []string
netConfigs []NetConfig
netInterfaces map[string]NetInterface
addresser *Addresser
}
func (s *HstSuite) TearDownSuite() {
s.unconfigureNetworkTopology()
}
func (s *HstSuite) TearDownTest() {
if *IsPersistent {
return
}
s.ResetContainers()
s.RemoveVolumes()
}
func (s *HstSuite) SetupTest() {
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 == false {
container.run()
}
}
}
func (s *HstSuite) hstFail() {
s.T().FailNow()
}
func (s *HstSuite) assertNil(object interface{}, msgAndArgs ...interface{}) {
if !assert.Nil(s.T(), object, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) assertNotNil(object interface{}, msgAndArgs ...interface{}) {
if !assert.NotNil(s.T(), object, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) assertEqual(expected, actual interface{}, msgAndArgs ...interface{}) {
if !assert.Equal(s.T(), expected, actual, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) assertNotEqual(expected, actual interface{}, msgAndArgs ...interface{}) {
if !assert.NotEqual(s.T(), expected, actual, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) assertContains(testString, contains interface{}, msgAndArgs ...interface{}) {
if !assert.Contains(s.T(), testString, contains, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) assertNotContains(testString, contains interface{}, msgAndArgs ...interface{}) {
if !assert.NotContains(s.T(), testString, contains, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) assertNotEmpty(object interface{}, msgAndArgs ...interface{}) {
if !assert.NotEmpty(s.T(), object, msgAndArgs...) {
s.hstFail()
}
}
func (s *HstSuite) log(args ...any) {
if *IsVerbose {
s.T().Log(args...)
}
}
func (s *HstSuite) skip(args ...any) {
s.log(args...)
s.T().SkipNow()
}
func (s *HstSuite) ResetContainers() {
for _, container := range s.containers {
container.stop()
}
}
func (s *HstSuite) RemoveVolumes() {
for _, volumeName := range s.volumes {
cmd := "docker volume rm " + volumeName
exechelper.Run(cmd)
os.RemoveAll(volumeName)
}
}
func (s *HstSuite) getContainerByName(name string) *Container {
return s.containers[name]
}
/*
* 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[name]
return &containerCopy
}
func (s *HstSuite) loadContainerTopology(topologyName string) {
data, err := ioutil.ReadFile(ContainerTopologyDir + topologyName + ".yaml")
if err != nil {
s.T().Fatalf("read error: %v", err)
}
var yamlTopo YamlTopology
err = yaml.Unmarshal(data, &yamlTopo)
if err != nil {
s.T().Fatalf("unmarshal error: %v", err)
}
for _, elem := range yamlTopo.Volumes {
volumeMap := elem["volume"].(VolumeConfig)
hostDir := volumeMap["host-dir"].(string)
s.volumes = append(s.volumes, hostDir)
}
s.containers = make(map[string]*Container)
for _, elem := range yamlTopo.Containers {
newContainer, err := NewContainer(elem)
newContainer.suite = s
if err != nil {
s.T().Fatalf("container config error: %v", err)
}
s.containers[newContainer.name] = newContainer
}
}
func (s *HstSuite) loadNetworkTopology(topologyName string) {
data, err := ioutil.ReadFile(NetworkTopologyDir + topologyName + ".yaml")
if err != nil {
s.T().Fatalf("read error: %v", err)
}
var yamlTopo YamlTopology
err = yaml.Unmarshal(data, &yamlTopo)
if err != nil {
s.T().Fatalf("unmarshal error: %v", err)
}
s.addresser = NewAddresser(s)
s.netInterfaces = make(map[string]NetInterface)
for _, elem := range yamlTopo.Devices {
switch elem["type"].(string) {
case NetNs:
{
if namespace, err := NewNetNamespace(elem); err == nil {
s.netConfigs = append(s.netConfigs, &namespace)
} else {
s.T().Fatalf("network config error: %v", err)
}
}
case Veth:
{
if veth, err := NewVeth(elem, s.addresser); err == nil {
s.netConfigs = append(s.netConfigs, &veth)
s.netInterfaces[veth.Name()] = &veth
} else {
s.T().Fatalf("network config error: %v", err)
}
}
case Tap:
{
if tap, err := NewTap(elem, s.addresser); err == nil {
s.netConfigs = append(s.netConfigs, &tap)
s.netInterfaces[tap.Name()] = &tap
} else {
s.T().Fatalf("network config error: %v", err)
}
}
case Bridge:
{
if bridge, err := NewBridge(elem); err == nil {
s.netConfigs = append(s.netConfigs, &bridge)
} else {
s.T().Fatalf("network config error: %v", err)
}
}
}
}
}
func (s *HstSuite) configureNetworkTopology(topologyName string) {
s.loadNetworkTopology(topologyName)
for _, nc := range s.netConfigs {
if err := nc.Configure(); err != nil {
s.T().Fatalf("network config error: %v", err)
}
}
}
func (s *HstSuite) unconfigureNetworkTopology() {
if *IsPersistent {
return
}
for _, nc := range s.netConfigs {
nc.Unconfigure()
}
}
type NetworkAddresses struct {
network int
numberOfAddresses int
}
type AddressCounter = int
type Addresser struct {
networks map[int]AddressCounter
suite *HstSuite
}
func (a *Addresser) AddNetwork(networkNumber int) {
a.networks[networkNumber] = 1
}
func (a *Addresser) NewIp4Address(inputNetworkNumber ...int) (string, error) {
var networkNumber int = 0
if len(inputNetworkNumber) > 0 {
networkNumber = inputNetworkNumber[0]
}
if _, ok := a.networks[networkNumber]; !ok {
a.AddNetwork(networkNumber)
}
numberOfAddresses := a.networks[networkNumber]
if numberOfAddresses == 254 {
return "", fmt.Errorf("no available IPv4 addresses")
}
address := fmt.Sprintf("10.10.%v.%v/24", networkNumber, numberOfAddresses)
a.networks[networkNumber] = numberOfAddresses + 1
return address, nil
}
func NewAddresser(suite *HstSuite) *Addresser {
var addresser = new(Addresser)
addresser.suite = suite
addresser.networks = make(map[int]AddressCounter)
addresser.AddNetwork(0)
return addresser
}
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