package main import ( "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 ) func IsPersistent() bool { return os.Getenv("HST_PERSIST") == "1" } func IsVerbose() bool { return os.Getenv("HST_VERBOSE") == "1" } 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 }