using k8s; using k8s.Models; using Logging; using Utils; namespace KubernetesWorkflow { public class K8sController { private readonly BaseLog log; private readonly K8sCluster cluster; private readonly KnownK8sPods knownPods; private readonly WorkflowNumberSource workflowNumberSource; private readonly K8sClient client; public K8sController(BaseLog log, K8sCluster cluster, KnownK8sPods knownPods, WorkflowNumberSource workflowNumberSource, string testNamespace) { this.log = log; this.cluster = cluster; this.knownPods = knownPods; this.workflowNumberSource = workflowNumberSource; client = new K8sClient(cluster.GetK8sClientConfig()); K8sTestNamespace = cluster.Configuration.K8sNamespacePrefix + testNamespace; } public void Dispose() { client.Dispose(); } public RunningPod BringOnline(ContainerRecipe[] containerRecipes, Location location) { log.Debug(); DiscoverK8sNodes(); EnsureTestNamespace(); var deploymentName = CreateDeployment(containerRecipes, location); var (serviceName, servicePortsMap) = CreateService(containerRecipes); var podInfo = FetchNewPod(); return new RunningPod(cluster, podInfo, deploymentName, serviceName, servicePortsMap.ToArray()); } public void Stop(RunningPod pod) { log.Debug(); if (!string.IsNullOrEmpty(pod.ServiceName)) DeleteService(pod.ServiceName); DeleteDeployment(pod.DeploymentName); WaitUntilDeploymentOffline(pod.DeploymentName); WaitUntilPodOffline(pod.PodInfo.Name); } public void DownloadPodLog(RunningPod pod, ContainerRecipe recipe, ILogHandler logHandler) { log.Debug(); using var stream = client.Run(c => c.ReadNamespacedPodLog(pod.PodInfo.Name, K8sTestNamespace, recipe.Name)); logHandler.Log(stream); } public string ExecuteCommand(RunningPod pod, string containerName, string command, params string[] args) { var cmdAndArgs = $"{containerName}: {command} ({string.Join(",", args)})"; log.Debug(cmdAndArgs); var runner = new CommandRunner(client, K8sTestNamespace, pod, containerName, command, args); runner.Run(); var result = runner.GetStdOut(); log.Debug($"{cmdAndArgs} = '{result}'"); return result; } public void DeleteAllResources() { log.Debug(); var all = client.Run(c => c.ListNamespace().Items); var namespaces = all.Select(n => n.Name()).Where(n => n.StartsWith(cluster.Configuration.K8sNamespacePrefix)); foreach (var ns in namespaces) { DeleteNamespace(ns); } foreach (var ns in namespaces) { WaitUntilNamespaceDeleted(ns); } } public void DeleteTestNamespace() { log.Debug(); if (IsTestNamespaceOnline()) { client.Run(c => c.DeleteNamespace(K8sTestNamespace, null, null, gracePeriodSeconds: 0)); } WaitUntilNamespaceDeleted(); } public void DeleteNamespace(string ns) { log.Debug(); if (IsNamespaceOnline(ns)) { client.Run(c => c.DeleteNamespace(ns, null, null, gracePeriodSeconds: 0)); } } #region Discover K8s Nodes private void DiscoverK8sNodes() { if (cluster.AvailableK8sNodes == null || !cluster.AvailableK8sNodes.Any()) { cluster.AvailableK8sNodes = GetAvailableK8sNodes(); if (cluster.AvailableK8sNodes.Length < 3) { log.Debug($"Warning: For full location support, at least 3 Kubernetes Nodes are required in the cluster. Nodes found: '{string.Join(",", cluster.AvailableK8sNodes.Select(p => $"{p.Key}={p.Value}"))}'."); } } } private K8sNodeLabel[] GetAvailableK8sNodes() { var nodes = client.Run(c => c.ListNode()); var optionals = nodes.Items.Select(i => CreateNodeLabel(i)); return optionals.Where(n => n != null).Select(n => n!).ToArray(); } private K8sNodeLabel? CreateNodeLabel(V1Node i) { var keys = i.Metadata.Labels.Keys; var hostnameKey = keys.SingleOrDefault(k => k.ToLowerInvariant().Contains("hostname")); if (hostnameKey != null) { var hostnameValue = i.Metadata.Labels[hostnameKey]; return new K8sNodeLabel(hostnameKey, hostnameValue); } return null; } #endregion #region Namespace management private string K8sTestNamespace { get; } private void EnsureTestNamespace() { if (IsTestNamespaceOnline()) return; var namespaceSpec = new V1Namespace { ApiVersion = "v1", Metadata = new V1ObjectMeta { Name = K8sTestNamespace, Labels = new Dictionary { { "name", K8sTestNamespace } } } }; client.Run(c => c.CreateNamespace(namespaceSpec)); WaitUntilNamespaceCreated(); CreatePolicy(); } private bool IsTestNamespaceOnline() { return IsNamespaceOnline(K8sTestNamespace); } private bool IsNamespaceOnline(string name) { return client.Run(c => c.ListNamespace().Items.Any(n => n.Metadata.Name == name)); } private void CreatePolicy() { client.Run(c => { var body = new V1NetworkPolicy { Metadata = new V1ObjectMeta { Name = "isolate-policy", NamespaceProperty = K8sTestNamespace }, Spec = new V1NetworkPolicySpec { PodSelector = new V1LabelSelector {}, PolicyTypes = new[] { "Ingress", "Egress" }, Ingress = new List { new V1NetworkPolicyIngressRule { FromProperty = new List { new V1NetworkPolicyPeer { PodSelector = new V1LabelSelector {} } } }, new V1NetworkPolicyIngressRule { FromProperty = new List { new V1NetworkPolicyPeer { NamespaceSelector = new V1LabelSelector { MatchLabels = GetRunnerNamespaceSelector() } } } } }, Egress = new List { new V1NetworkPolicyEgressRule { To = new List { new V1NetworkPolicyPeer { PodSelector = new V1LabelSelector {} } } }, new V1NetworkPolicyEgressRule { To = new List { new V1NetworkPolicyPeer { NamespaceSelector = new V1LabelSelector { MatchLabels = new Dictionary { { "kubernetes.io/metadata.name", "kube-system" } } } }, new V1NetworkPolicyPeer { PodSelector = new V1LabelSelector { MatchLabels = new Dictionary { { "k8s-app", "kube-dns" } } } } }, Ports = new List { new V1NetworkPolicyPort { Port = new IntstrIntOrString { Value = "53" }, Protocol = "UDP" } } }, new V1NetworkPolicyEgressRule { To = new List { new V1NetworkPolicyPeer { IpBlock = new V1IPBlock { Cidr = "0.0.0.0/0" } } }, Ports = new List { new V1NetworkPolicyPort { Port = new IntstrIntOrString { Value = "80" }, Protocol = "TCP" }, new V1NetworkPolicyPort { Port = new IntstrIntOrString { Value = "443" }, Protocol = "TCP" } } } } } }; c.CreateNamespacedNetworkPolicy(body, K8sTestNamespace); }); } #endregion #region Deployment management private string CreateDeployment(ContainerRecipe[] containerRecipes, Location location) { var deploymentSpec = new V1Deployment { ApiVersion = "apps/v1", Metadata = CreateDeploymentMetadata(), Spec = new V1DeploymentSpec { Replicas = 1, Selector = new V1LabelSelector { MatchLabels = GetSelector() }, Template = new V1PodTemplateSpec { Metadata = new V1ObjectMeta { Labels = GetSelector() }, Spec = new V1PodSpec { NodeSelector = CreateNodeSelector(location), Containers = CreateDeploymentContainers(containerRecipes) } } } }; client.Run(c => c.CreateNamespacedDeployment(deploymentSpec, K8sTestNamespace)); WaitUntilDeploymentOnline(deploymentSpec.Metadata.Name); return deploymentSpec.Metadata.Name; } private void DeleteDeployment(string deploymentName) { client.Run(c => c.DeleteNamespacedDeployment(deploymentName, K8sTestNamespace)); WaitUntilDeploymentOffline(deploymentName); } private IDictionary CreateNodeSelector(Location location) { var nodeLabel = cluster.GetNodeLabelForLocation(location); if (nodeLabel == null) return new Dictionary(); return new Dictionary { { nodeLabel.Key, nodeLabel.Value } }; } private IDictionary GetSelector() { return new Dictionary { { "codex-test-node", "dist-test-" + workflowNumberSource.WorkflowNumber } }; } private IDictionary GetRunnerNamespaceSelector() { return new Dictionary { { "kubernetes.io/metadata.name", "default" } }; } private V1ObjectMeta CreateDeploymentMetadata() { return new V1ObjectMeta { Name = "deploy-" + workflowNumberSource.WorkflowNumber, NamespaceProperty = K8sTestNamespace, Labels = GetSelector() }; } private List CreateDeploymentContainers(ContainerRecipe[] containerRecipes) { return containerRecipes.Select(r => CreateDeploymentContainer(r)).ToList(); } private V1Container CreateDeploymentContainer(ContainerRecipe recipe) { return new V1Container { Name = recipe.Name, Image = recipe.Image, ImagePullPolicy = "Always", Ports = CreateContainerPorts(recipe), Env = CreateEnv(recipe) }; } private List CreateEnv(ContainerRecipe recipe) { return recipe.EnvVars.Select(CreateEnvVar).ToList(); } private V1EnvVar CreateEnvVar(EnvVar envVar) { return new V1EnvVar { Name = envVar.Name, Value = envVar.Value, }; } private List CreateContainerPorts(ContainerRecipe recipe) { var exposedPorts = recipe.ExposedPorts.Select(p => CreateContainerPort(recipe, p)); var internalPorts = recipe.InternalPorts.Select(p => CreateContainerPort(recipe, p)); return exposedPorts.Concat(internalPorts).ToList(); } private V1ContainerPort CreateContainerPort(ContainerRecipe recipe, Port port) { return new V1ContainerPort { Name = GetNameForPort(recipe, port), ContainerPort = port.Number }; } private string GetNameForPort(ContainerRecipe recipe, Port port) { return $"p{workflowNumberSource.WorkflowNumber}-{recipe.Number}-{port.Number}"; } #endregion #region Service management private (string, List) CreateService(ContainerRecipe[] containerRecipes) { var result = new List(); var ports = CreateServicePorts(containerRecipes); if (!ports.Any()) { // None of these container-recipes wish to expose anything via a service port. // So, we don't have to create a service. return (string.Empty, result); } var serviceSpec = new V1Service { ApiVersion = "v1", Metadata = CreateServiceMetadata(), Spec = new V1ServiceSpec { Type = "NodePort", Selector = GetSelector(), Ports = ports } }; client.Run(c => c.CreateNamespacedService(serviceSpec, K8sTestNamespace)); ReadBackServiceAndMapPorts(serviceSpec, containerRecipes, result); return (serviceSpec.Metadata.Name, result); } private void ReadBackServiceAndMapPorts(V1Service serviceSpec, ContainerRecipe[] containerRecipes, List result) { // For each container-recipe, we need to figure out which service-ports it was assigned by K8s. var readback = client.Run(c => c.ReadNamespacedService(serviceSpec.Metadata.Name, K8sTestNamespace)); foreach (var r in containerRecipes) { if (r.ExposedPorts.Any()) { var firstExposedPort = r.ExposedPorts.First(); var portName = GetNameForPort(r, firstExposedPort); var matchingServicePorts = readback.Spec.Ports.Where(p => p.Name == portName); if (matchingServicePorts.Any()) { // These service ports belongs to this recipe. var optionals = matchingServicePorts.Select(p => MapNodePortIfAble(p, portName)); var ports = optionals.Where(p => p != null).Select(p => p!).ToArray(); result.Add(new ContainerRecipePortMapEntry(r.Number, ports)); } } } } private Port? MapNodePortIfAble(V1ServicePort p, string tag) { if (p.NodePort == null) return null; return new Port(p.NodePort.Value, tag); } private void DeleteService(string serviceName) { client.Run(c => c.DeleteNamespacedService(serviceName, K8sTestNamespace)); } private V1ObjectMeta CreateServiceMetadata() { return new V1ObjectMeta { Name = "service-" + workflowNumberSource.WorkflowNumber, NamespaceProperty = K8sTestNamespace }; } private List CreateServicePorts(ContainerRecipe[] recipes) { var result = new List(); foreach (var recipe in recipes) { result.AddRange(CreateServicePorts(recipe)); } return result; } private List CreateServicePorts(ContainerRecipe recipe) { var result = new List(); foreach (var port in recipe.ExposedPorts) { result.Add(new V1ServicePort { Name = GetNameForPort(recipe, port), Protocol = "TCP", Port = port.Number, TargetPort = GetNameForPort(recipe, port), }); } return result; } #endregion #region Waiting private void WaitUntilNamespaceCreated() { WaitUntil(() => IsTestNamespaceOnline()); } private void WaitUntilNamespaceDeleted() { WaitUntil(() => !IsTestNamespaceOnline()); } private void WaitUntilNamespaceDeleted(string name) { WaitUntil(() => !IsNamespaceOnline(name)); } private void WaitUntilDeploymentOnline(string deploymentName) { WaitUntil(() => { var deployment = client.Run(c => c.ReadNamespacedDeployment(deploymentName, K8sTestNamespace)); return deployment?.Status.AvailableReplicas != null && deployment.Status.AvailableReplicas > 0; }); } private void WaitUntilDeploymentOffline(string deploymentName) { WaitUntil(() => { var deployments = client.Run(c => c.ListNamespacedDeployment(K8sTestNamespace)); var deployment = deployments.Items.SingleOrDefault(d => d.Metadata.Name == deploymentName); return deployment == null || deployment.Status.AvailableReplicas == 0; }); } private void WaitUntilPodOffline(string podName) { WaitUntil(() => { var pods = client.Run(c => c.ListNamespacedPod(K8sTestNamespace)).Items; var pod = pods.SingleOrDefault(p => p.Metadata.Name == podName); return pod == null; }); } private void WaitUntil(Func predicate) { var sw = Stopwatch.Begin(log, true); try { Time.WaitUntil(predicate, cluster.K8sOperationTimeout(), cluster.WaitForK8sServiceDelay()); } finally { sw.End("", 1); } } #endregion private PodInfo FetchNewPod() { var pods = client.Run(c => c.ListNamespacedPod(K8sTestNamespace)).Items; var newPods = pods.Where(p => !knownPods.Contains(p.Name())).ToArray(); if (newPods.Length != 1) throw new InvalidOperationException("Expected only 1 pod to be created. Test infra failure."); var newPod = newPods.Single(); var name = newPod.Name(); var ip = newPod.Status.PodIP; var k8sNodeName = newPod.Spec.NodeName; if (string.IsNullOrEmpty(name)) throw new InvalidOperationException("Invalid pod name received. Test infra failure."); if (string.IsNullOrEmpty(ip)) throw new InvalidOperationException("Invalid pod IP received. Test infra failure."); knownPods.Add(name); return new PodInfo(name, ip, k8sNodeName); } } }