aci.go

package azure

import (
	"bytes"
	"context"
	"crypto/sha256"
	"encoding/base64"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"net"
	"net/http"
	"os"
	"reflect"
	"strings"
	"sync"
	"time"

	"github.com/gorilla/websocket"
	client "github.com/virtual-kubelet/azure-aci/client"
	"github.com/virtual-kubelet/azure-aci/client/aci"
	"github.com/virtual-kubelet/azure-aci/client/network"
	"github.com/virtual-kubelet/node-cli/manager"
	"github.com/virtual-kubelet/virtual-kubelet/errdefs"
	"github.com/virtual-kubelet/virtual-kubelet/log"
	"github.com/virtual-kubelet/virtual-kubelet/node/api"
	"github.com/virtual-kubelet/virtual-kubelet/trace"
	v1 "k8s.io/api/core/v1"
	k8serr "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/apimachinery/pkg/util/intstr"
	clientcmdv1 "k8s.io/client-go/tools/clientcmd/api/v1"
	stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
)

const (
	// The service account secret mount path.
	serviceAccountSecretMountPath = "/var/run/secrets/kubernetes.io/serviceaccount"

	virtualKubeletDNSNameLabel = "virtualkubelet.io/dnsnamelabel"

	subnetsAction           = "Microsoft.Network/virtualNetworks/subnets/action"
	subnetDelegationService = "Microsoft.ContainerInstance/containerGroups"
)

// DNS configuration settings
const (
	maxDNSNameservers     = 3
	maxDNSSearchPaths     = 6
	maxDNSSearchListChars = 256
)

const (
	gpuResourceName   v1.ResourceName = "nvidia.com/gpu"
	gpuTypeAnnotation                 = "virtual-kubelet.io/gpu-type"
)

// ACIProvider implements the virtual-kubelet provider interface and communicates with Azure's ACI APIs.
type ACIProvider struct {
	aciClient          *aci.Client
	resourceManager    *manager.ResourceManager
	resourceGroup      string
	region             string
	nodeName           string
	operatingSystem    string
	cpu                string
	memory             string
	pods               string
	gpu                string
	gpuSKUs            []aci.GPUSKU
	internalIP         string
	daemonEndpointPort int32
	diagnostics        *aci.ContainerGroupDiagnostics
	subnetName         string
	subnetCIDR         string
	networkProfileName string
	vnetName           string
	vnetResourceGroup  string
	networkProfile     string
	kubeProxyExtension *aci.Extension
	kubeDNSIP          string
	extraUserAgent     string

	metricsSync     sync.Mutex
	metricsSyncTime time.Time
	lastMetric      *stats.Summary
}

// AuthConfig is the secret returned from an ImageRegistryCredential
type AuthConfig struct {
	Username      string `json:"username,omitempty"`
	Password      string `json:"password,omitempty"`
	Auth          string `json:"auth,omitempty"`
	Email         string `json:"email,omitempty"`
	ServerAddress string `json:"serveraddress,omitempty"`
	IdentityToken string `json:"identitytoken,omitempty"`
	RegistryToken string `json:"registrytoken,omitempty"`
}

// See https://azure.microsoft.com/en-us/status/ for valid regions.
var validAciRegions = []string{
	"australiaeast",
	"canadacentral",
	"centralindia",
	"centralus",
	"eastasia",
	"eastus",
	"eastus2",
	"eastus2euap",
	"japaneast",
	"northcentralus",
	"northeurope",
	"southcentralus",
	"southeastasia",
	"southindia",
	"uksouth",
	"westcentralus",
	"westus",
	"westus2",
	"westeurope",
}

// isValidACIRegion checks to make sure we're using a valid ACI region
func isValidACIRegion(region string) bool {
	regionLower := strings.ToLower(region)
	regionTrimmed := strings.Replace(regionLower, " ", "", -1)

	for _, validRegion := range validAciRegions {
		if regionTrimmed == validRegion {
			return true
		}
	}

	return false
}

// NewACIProvider creates a new ACIProvider.
func NewACIProvider(config string, rm *manager.ResourceManager, nodeName, operatingSystem string, internalIP string, daemonEndpointPort int32) (*ACIProvider, error) {
	var p ACIProvider
	var err error

	p.resourceManager = rm

	if config != "" {
		f, err := os.Open(config)
		if err != nil {
			return nil, err
		}
		defer f.Close()

		if err := p.loadConfig(f); err != nil {
			return nil, err
		}
	}

	var azAuth *client.Authentication

	if authFilepath := os.Getenv("AZURE_AUTH_LOCATION"); authFilepath != "" {
		auth, err := client.NewAuthenticationFromFile(authFilepath)
		if err != nil {
			return nil, err
		}

		azAuth = auth
	}

	if acsFilepath := os.Getenv("ACS_CREDENTIAL_LOCATION"); acsFilepath != "" {
		acsCredential, err := NewAcsCredential(acsFilepath)
		if err != nil {
			return nil, err
		}

		if acsCredential != nil {
			if acsCredential.Cloud != client.PublicCloud.Name {
				return nil, fmt.Errorf("ACI only supports Public Azure. '%v' is not supported", acsCredential.Cloud)
			}

			azAuth = client.NewAuthentication(
				acsCredential.Cloud,
				acsCredential.ClientID,
				acsCredential.ClientSecret,
				acsCredential.SubscriptionID,
				acsCredential.TenantID)

			p.resourceGroup = acsCredential.ResourceGroup
			p.region = acsCredential.Region

			p.vnetName = acsCredential.VNetName
			p.vnetResourceGroup = acsCredential.VNetResourceGroup
			if p.vnetResourceGroup == "" {
				p.vnetResourceGroup = p.resourceGroup
			}
		}
	}

	if clientID := os.Getenv("AZURE_CLIENT_ID"); clientID != "" {
		azAuth.ClientID = clientID
	}

	if clientSecret := os.Getenv("AZURE_CLIENT_SECRET"); clientSecret != "" {
		azAuth.ClientSecret = clientSecret
	}

	if tenantID := os.Getenv("AZURE_TENANT_ID"); tenantID != "" {
		azAuth.TenantID = tenantID
	}

	if subscriptionID := os.Getenv("AZURE_SUBSCRIPTION_ID"); subscriptionID != "" {
		azAuth.SubscriptionID = subscriptionID
	}

	p.extraUserAgent = os.Getenv("ACI_EXTRA_USER_AGENT")

	p.aciClient, err = aci.NewClient(azAuth, p.extraUserAgent)
	if err != nil {
		return nil, err
	}

	// If the log analytics file has been specified, load workspace credentials from the file
	if logAnalyticsAuthFile := os.Getenv("LOG_ANALYTICS_AUTH_LOCATION"); logAnalyticsAuthFile != "" {
		p.diagnostics, err = aci.NewContainerGroupDiagnosticsFromFile(logAnalyticsAuthFile)
		if err != nil {
			return nil, err
		}
	}

	// If we have both the log analytics workspace id and key, add them to the provider
	// Environment variables overwrite the values provided in the file
	if logAnalyticsID := os.Getenv("LOG_ANALYTICS_ID"); logAnalyticsID != "" {
		if logAnalyticsKey := os.Getenv("LOG_ANALYTICS_KEY"); logAnalyticsKey != "" {
			p.diagnostics, err = aci.NewContainerGroupDiagnostics(logAnalyticsID, logAnalyticsKey)
			if err != nil {
				return nil, err
			}
		}
	}

	if clusterResourceID := os.Getenv("CLUSTER_RESOURCE_ID"); clusterResourceID != "" {
		if p.diagnostics != nil && p.diagnostics.LogAnalytics != nil {
			p.diagnostics.LogAnalytics.LogType = aci.LogAnlyticsLogTypeContainerInsights
			p.diagnostics.LogAnalytics.Metadata = map[string]string{
				aci.LogAnalyticsMetadataKeyClusterResourceID: clusterResourceID,
				aci.LogAnalyticsMetadataKeyNodeName:          nodeName,
			}
		}
	}

	if rg := os.Getenv("ACI_RESOURCE_GROUP"); rg != "" {
		p.resourceGroup = rg
	}
	if p.resourceGroup == "" {
		return nil, errors.New("Resource group can not be empty please set ACI_RESOURCE_GROUP")
	}

	if r := os.Getenv("ACI_REGION"); r != "" {
		p.region = r
	}
	if p.region == "" {
		return nil, errors.New("Region can not be empty please set ACI_REGION")
	}
	if r := p.region; !isValidACIRegion(r) {
		unsupportedRegionMessage := fmt.Sprintf("Region %s is invalid. Current supported regions are: %s",
			r, strings.Join(validAciRegions, ", "))

		return nil, errors.New(unsupportedRegionMessage)
	}

	if err := p.setupCapacity(context.TODO()); err != nil {
		return nil, err
	}

	p.operatingSystem = operatingSystem
	p.nodeName = nodeName
	p.internalIP = internalIP
	p.daemonEndpointPort = daemonEndpointPort

	if subnetName := os.Getenv("ACI_SUBNET_NAME"); p.vnetName != "" && subnetName != "" {
		p.subnetName = subnetName
	}
	if networkProfileName := os.Getenv("ACI_NETWORK_PROFILE_NAME"); networkProfileName != "" {
		p.networkProfileName = networkProfileName
	}
	if subnetCIDR := os.Getenv("ACI_SUBNET_CIDR"); subnetCIDR != "" {
		if p.subnetName == "" {
			return nil, fmt.Errorf("subnet CIDR defined but no subnet name, subnet name is required to set a subnet CIDR")
		}
		if _, _, err := net.ParseCIDR(subnetCIDR); err != nil {
			return nil, fmt.Errorf("error parsing provided subnet range: %v", err)
		}
		p.subnetCIDR = subnetCIDR
	}

	if p.subnetName != "" {
		if err := p.setupNetworkProfile(azAuth); err != nil {
			return nil, fmt.Errorf("error setting up network profile: %v", err)
		}

		masterURI := os.Getenv("MASTER_URI")
		if masterURI == "" {
			masterURI = "10.0.0.1"
		}

		clusterCIDR := os.Getenv("CLUSTER_CIDR")
		if clusterCIDR == "" {
			clusterCIDR = "10.240.0.0/16"
		}

		p.kubeProxyExtension, err = getKubeProxyExtension(serviceAccountSecretMountPath, masterURI, clusterCIDR)
		if err != nil {
			return nil, fmt.Errorf("error creating kube proxy extension: %v", err)
		}

		p.kubeDNSIP = "10.0.0.10"
		if kubeDNSIP := os.Getenv("KUBE_DNS_IP"); kubeDNSIP != "" {
			p.kubeDNSIP = kubeDNSIP
		}
	}

	return &p, err
}

func (p *ACIProvider) setupCapacity(ctx context.Context) error {
	ctx, span := trace.StartSpan(ctx, "setupCapacity")
	defer span.End()
	logger := log.G(ctx).WithField("method", "setupCapacity")

	// Set sane defaults for Capacity in case config is not supplied
	p.cpu = "800"
	p.memory = "4Ti"
	p.pods = "800"

	if cpuQuota := os.Getenv("ACI_QUOTA_CPU"); cpuQuota != "" {
		p.cpu = cpuQuota
	}

	if memoryQuota := os.Getenv("ACI_QUOTA_MEMORY"); memoryQuota != "" {
		p.memory = memoryQuota
	}

	if podsQuota := os.Getenv("ACI_QUOTA_POD"); podsQuota != "" {
		p.pods = podsQuota
	}

	metadata, err := p.aciClient.GetResourceProviderMetadata(ctx)

	if err != nil {
		msg := "Unable to fetch the ACI metadata"
		logger.WithError(err).Error(msg)
		return err
	}

	if metadata == nil || metadata.GPURegionalSKUs == nil {
		logger.Warn("ACI GPU capacity is not enabled. GPU capacity will be disabled")
		return nil
	}

	for _, regionalSKU := range metadata.GPURegionalSKUs {
		if strings.EqualFold(regionalSKU.Location, p.region) && len(regionalSKU.SKUs) != 0 {
			p.gpu = "100"
			if gpu := os.Getenv("ACI_QUOTA_GPU"); gpu != "" {
				p.gpu = gpu
			}
			p.gpuSKUs = regionalSKU.SKUs
		}
	}

	return nil
}

func (p *ACIProvider) setupNetworkProfile(auth *client.Authentication) error {
	c, err := network.NewClient(auth, p.extraUserAgent)
	if err != nil {
		return fmt.Errorf("error creating azure networking client: %v", err)
	}

	createSubnet := true
	subnet, err := c.GetSubnet(p.vnetResourceGroup, p.vnetName, p.subnetName)
	if err != nil && !network.IsNotFound(err) {
		return fmt.Errorf("error while looking up subnet: %v", err)
	}
	if network.IsNotFound(err) && p.subnetCIDR == "" {
		return fmt.Errorf("subnet '%s' is not found in vnet '%s' in resource group '%s' and subnet CIDR is not specified", p.subnetName, p.vnetName, p.vnetResourceGroup)
	}
	if err == nil {
		if p.subnetCIDR == "" {
			p.subnetCIDR = *subnet.SubnetPropertiesFormat.AddressPrefix
		}
		if p.subnetCIDR != *subnet.SubnetPropertiesFormat.AddressPrefix {
			return fmt.Errorf("found subnet '%s' using different CIDR: '%s'. desired: '%s'", p.subnetName, *subnet.SubnetPropertiesFormat.AddressPrefix, p.subnetCIDR)
		}
		if subnet.SubnetPropertiesFormat.RouteTable != nil {
			return fmt.Errorf("unable to delegate subnet '%s' to Azure Container Instance since it references the route table '%s'.", p.subnetName, *subnet.SubnetPropertiesFormat.RouteTable.ID)
		}
		if subnet.SubnetPropertiesFormat.ServiceAssociationLinks != nil {
			for _, l := range *subnet.SubnetPropertiesFormat.ServiceAssociationLinks {
				if l.ServiceAssociationLinkPropertiesFormat != nil && *l.ServiceAssociationLinkPropertiesFormat.LinkedResourceType == subnetDelegationService {
					createSubnet = false
					break
				}

				return fmt.Errorf("unable to delegate subnet '%s' to Azure Container Instance as it is used by other Azure resource: '%v'.", p.subnetName, l)
			}
		} else {
			for _, d := range *subnet.SubnetPropertiesFormat.Delegations {
				if d.ServiceDelegationPropertiesFormat != nil && *d.ServiceDelegationPropertiesFormat.ServiceName == subnetDelegationService {
					createSubnet = false
					break
				}
			}
		}
	}

	if createSubnet {
		subnet = network.NewSubnetWithContainerInstanceDelegation(p.subnetName, p.subnetCIDR)
		subnet, err = c.CreateOrUpdateSubnet(p.vnetResourceGroup, p.vnetName, subnet)
		if err != nil {
			return fmt.Errorf("error creating subnet: %v", err)
		}
	}
	if p.networkProfileName == "" {
		p.networkProfileName = getNetworkProfileName(*subnet.ID)
	}

	profile, err := c.GetProfile(p.resourceGroup, p.networkProfileName)
	if err != nil && !network.IsNotFound(err) {
		return fmt.Errorf("error while looking up network profile: %v", err)
	}
	if err == nil {
		for _, config := range *profile.ProfilePropertiesFormat.ContainerNetworkInterfaceConfigurations {
			for _, ipConfig := range *config.ContainerNetworkInterfaceConfigurationPropertiesFormat.IPConfigurations {
				if *ipConfig.IPConfigurationProfilePropertiesFormat.Subnet.ID == *subnet.ID {
					p.networkProfile = *profile.ID
					return nil
				}
			}
		}
	}

	// at this point, profile should be nil
	profile = network.NewNetworkProfile(p.networkProfileName, p.region, *subnet.ID)
	profile, err = c.CreateOrUpdateProfile(p.resourceGroup, profile)
	if err != nil {
		return err
	}

	p.networkProfile = *profile.ID
	return nil
}

func getNetworkProfileName(subnetID string) string {
	h := sha256.New()
	h.Write([]byte(strings.ToUpper(subnetID)))
	hashBytes := h.Sum(nil)
	return fmt.Sprintf("vk-%s", hex.EncodeToString(hashBytes))
}

func getKubeProxyExtension(secretPath, masterURI, clusterCIDR string) (*aci.Extension, error) {
	ca, err := ioutil.ReadFile(secretPath + "/ca.crt")
	if err != nil {
		return nil, fmt.Errorf("failed to read ca.crt file: %v", err)
	}

	var token []byte
	token, err = ioutil.ReadFile(secretPath + "/token")
	if err != nil {
		return nil, fmt.Errorf("failed to read token file: %v", err)
	}

	name := "virtual-kubelet"

	config := clientcmdv1.Config{
		APIVersion: "v1",
		Kind:       "Config",
		Clusters: []clientcmdv1.NamedCluster{
			clientcmdv1.NamedCluster{
				Name: name,
				Cluster: clientcmdv1.Cluster{
					Server: masterURI,
					CertificateAuthorityData: ca,
				},
			},
		},
		AuthInfos: []clientcmdv1.NamedAuthInfo{
			clientcmdv1.NamedAuthInfo{
				Name: name,
				AuthInfo: clientcmdv1.AuthInfo{
					Token: string(token),
				},
			},
		},
		Contexts: []clientcmdv1.NamedContext{
			clientcmdv1.NamedContext{
				Name: name,
				Context: clientcmdv1.Context{
					Cluster:  name,
					AuthInfo: name,
				},
			},
		},
		CurrentContext: name,
	}

	b := new(bytes.Buffer)
	if err := json.NewEncoder(b).Encode(config); err != nil {
		return nil, fmt.Errorf("failed to encode the kubeconfig: %v", err)
	}

	extension := aci.Extension{
		Name: "kube-proxy",
		Properties: &aci.ExtensionProperties{
			Type:    aci.ExtensionTypeKubeProxy,
			Version: aci.ExtensionVersion1_0,
			Settings: map[string]string{
				aci.KubeProxyExtensionSettingClusterCIDR: clusterCIDR,
				aci.KubeProxyExtensionSettingKubeVersion: aci.KubeProxyExtensionKubeVersion,
			},
			ProtectedSettings: map[string]string{
				aci.KubeProxyExtensionSettingKubeConfig: base64.StdEncoding.EncodeToString(b.Bytes()),
			},
		},
	}

	return &extension, nil
}

func addAzureAttributes(ctx context.Context, span trace.Span, p *ACIProvider) context.Context {
	return span.WithFields(ctx, log.Fields{
		"azure.resourceGroup": p.resourceGroup,
		"azure.region":        p.region,
	})
}

// CreatePod accepts a Pod definition and creates
// an ACI deployment
func (p *ACIProvider) CreatePod(ctx context.Context, pod *v1.Pod) error {
	ctx, span := trace.StartSpan(ctx, "aci.CreatePod")
	defer span.End()
	ctx = addAzureAttributes(ctx, span, p)

	var containerGroup aci.ContainerGroup
	containerGroup.Location = p.region
	containerGroup.RestartPolicy = aci.ContainerGroupRestartPolicy(pod.Spec.RestartPolicy)
	containerGroup.ContainerGroupProperties.OsType = aci.OperatingSystemTypes(p.operatingSystem)

	// get containers
	containers, err := p.getContainers(pod)
	if err != nil {
		return err
	}
	// get registry creds
	creds, err := p.getImagePullSecrets(pod)
	if err != nil {
		return err
	}
	// get volumes
	volumes, err := p.getVolumes(pod)
	if err != nil {
		return err
	}
	// assign all the things
	containerGroup.ContainerGroupProperties.Containers = containers
	containerGroup.ContainerGroupProperties.Volumes = volumes
	containerGroup.ContainerGroupProperties.ImageRegistryCredentials = creds
	containerGroup.ContainerGroupProperties.Diagnostics = p.getDiagnostics(pod)

	filterServiceAccountSecretVolume(p.operatingSystem, &containerGroup)

	// create ipaddress if containerPort is used
	count := 0
	for _, container := range containers {
		count = count + len(container.Ports)
	}
	ports := make([]aci.Port, 0, count)
	for _, container := range containers {
		for _, containerPort := range container.Ports {

			ports = append(ports, aci.Port{
				Port:     containerPort.Port,
				Protocol: aci.ContainerGroupNetworkProtocol("TCP"),
			})
		}
	}
	if len(ports) > 0 && p.subnetName == "" {
		containerGroup.ContainerGroupProperties.IPAddress = &aci.IPAddress{
			Ports: ports,
			Type:  "Public",
		}

		if dnsNameLabel := pod.Annotations[virtualKubeletDNSNameLabel]; dnsNameLabel != "" {
			containerGroup.ContainerGroupProperties.IPAddress.DNSNameLabel = dnsNameLabel
		}
	}

	podUID := string(pod.UID)
	podCreationTimestamp := pod.CreationTimestamp.String()
	containerGroup.Tags = map[string]string{
		"PodName":           pod.Name,
		"ClusterName":       pod.ClusterName,
		"NodeName":          pod.Spec.NodeName,
		"Namespace":         pod.Namespace,
		"UID":               podUID,
		"CreationTimestamp": podCreationTimestamp,
	}

	p.amendVnetResources(&containerGroup, pod)

	_, err = p.aciClient.CreateContainerGroup(
		ctx,
		p.resourceGroup,
		containerGroupName(pod),
		containerGroup,
	)

	return err
}

func (p *ACIProvider) amendVnetResources(containerGroup *aci.ContainerGroup, pod *v1.Pod) {
	if p.networkProfile == "" {
		return
	}

	containerGroup.NetworkProfile = &aci.NetworkProfileDefinition{ID: p.networkProfile}

	containerGroup.ContainerGroupProperties.Extensions = []*aci.Extension{p.kubeProxyExtension}
	containerGroup.ContainerGroupProperties.DNSConfig = p.getDNSConfig(pod.Spec.DNSPolicy, pod.Spec.DNSConfig)
}

func (p *ACIProvider) getDNSConfig(dnsPolicy v1.DNSPolicy, dnsConfig *v1.PodDNSConfig) *aci.DNSConfig {
	nameServers := make([]string, 0)

	if dnsPolicy == v1.DNSClusterFirst || dnsPolicy == v1.DNSClusterFirstWithHostNet {
		nameServers = append(nameServers, p.kubeDNSIP)
	}

	searchDomains := []string{}
	options := []string{}

	if dnsConfig != nil {
		nameServers = omitDuplicates(append(nameServers, dnsConfig.Nameservers...))
		searchDomains = omitDuplicates(dnsConfig.Searches)

		for _, option := range dnsConfig.Options {
			op := option.Name
			if option.Value != nil && *(option.Value) != "" {
				op = op + ":" + *(option.Value)
			}
			options = append(options, op)
		}
	}

	if len(nameServers) == 0 {
		return nil
	}

	result := aci.DNSConfig{
		NameServers:   formDNSNameserversFitsLimits(nameServers),
		SearchDomains: formDNSSearchFitsLimits(searchDomains),
		Options:       strings.Join(options, " "),
	}

	return &result
}

func omitDuplicates(strs []string) []string {
	uniqueStrs := make(map[string]bool)

	var ret []string
	for _, str := range strs {
		if !uniqueStrs[str] {
			ret = append(ret, str)
			uniqueStrs[str] = true
		}
	}
	return ret
}

func formDNSNameserversFitsLimits(nameservers []string) []string {
	if len(nameservers) > maxDNSNameservers {
		nameservers = nameservers[:maxDNSNameservers]
		msg := fmt.Sprintf("Nameserver limits were exceeded, some nameservers have been omitted, the applied nameserver line is: %s", strings.Join(nameservers, ";"))
		log.G(context.TODO()).WithField("method", "formDNSNameserversFitsLimits").Warn(msg)
	}
	return nameservers
}

func formDNSSearchFitsLimits(searches []string) string {
	limitsExceeded := false

	if len(searches) > maxDNSSearchPaths {
		searches = searches[:maxDNSSearchPaths]
		limitsExceeded = true
	}

	if resolvSearchLineStrLen := len(strings.Join(searches, " ")); resolvSearchLineStrLen > maxDNSSearchListChars {
		cutDomainsNum := 0
		cutDomainsLen := 0
		for i := len(searches) - 1; i >= 0; i-- {
			cutDomainsLen += len(searches[i]) + 1
			cutDomainsNum++

			if (resolvSearchLineStrLen - cutDomainsLen) <= maxDNSSearchListChars {
				break
			}
		}

		searches = searches[:(len(searches) - cutDomainsNum)]
		limitsExceeded = true
	}

	if limitsExceeded {
		msg := fmt.Sprintf("Search Line limits were exceeded, some search paths have been omitted, the applied search line is: %s", strings.Join(searches, ";"))
		log.G(context.TODO()).WithField("method", "formDNSSearchFitsLimits").Warn(msg)
	}

	return strings.Join(searches, " ")
}

func (p *ACIProvider) getDiagnostics(pod *v1.Pod) *aci.ContainerGroupDiagnostics {
	if p.diagnostics != nil && p.diagnostics.LogAnalytics != nil && p.diagnostics.LogAnalytics.LogType == aci.LogAnlyticsLogTypeContainerInsights {
		d := *p.diagnostics
		d.LogAnalytics.Metadata[aci.LogAnalyticsMetadataKeyPodUUID] = string(pod.ObjectMeta.UID)
		return &d
	}
	return p.diagnostics
}

func containerGroupName(pod *v1.Pod) string {
	return fmt.Sprintf("%s-%s", pod.Namespace, pod.Name)
}

// UpdatePod is a noop, ACI currently does not support live updates of a pod.
func (p *ACIProvider) UpdatePod(ctx context.Context, pod *v1.Pod) error {
	return nil
}

// DeletePod deletes the specified pod out of ACI.
func (p *ACIProvider) DeletePod(ctx context.Context, pod *v1.Pod) error {
	ctx, span := trace.StartSpan(ctx, "aci.DeletePod")
	defer span.End()
	ctx = addAzureAttributes(ctx, span, p)

	err := p.aciClient.DeleteContainerGroup(ctx, p.resourceGroup, fmt.Sprintf("%s-%s", pod.Namespace, pod.Name))
	return wrapError(err)
}

// GetPod returns a pod by name that is running inside ACI
// returns nil if a pod by that name is not found.
func (p *ACIProvider) GetPod(ctx context.Context, namespace, name string) (*v1.Pod, error) {
	ctx, span := trace.StartSpan(ctx, "aci.GetPod")
	defer span.End()
	ctx = addAzureAttributes(ctx, span, p)

	cg, status, err := p.aciClient.GetContainerGroup(ctx, p.resourceGroup, fmt.Sprintf("%s-%s", namespace, name))
	if err != nil {
		if status != nil && *status == http.StatusNotFound {
			// There is bug in vk v1.1 (in Sync loop used as a substitute for async provider updates api) which causes crash if we returned
			// a (nil, nil) from GetPodStatus() for a newly created pod, will return NotFound instead.
			// TODO: This loop isn't going to be available beyond v1.1, changes on provider needs to handle it.
			return nil, errdefs.NotFound("cg not found")
		}
		return nil, err
	}

	if cg.Tags["NodeName"] != p.nodeName {
		return nil, nil
	}

	return containerGroupToPod(cg)
}

// GetContainerLogs returns the logs of a pod by name that is running inside ACI.
func (p *ACIProvider) GetContainerLogs(ctx context.Context, namespace, podName, containerName string, opts api.ContainerLogOpts) (io.ReadCloser, error) {
	ctx, span := trace.StartSpan(ctx, "aci.GetContainerLogs")
	defer span.End()
	ctx = addAzureAttributes(ctx, span, p)

	cg, _, err := p.aciClient.GetContainerGroup(ctx, p.resourceGroup, fmt.Sprintf("%s-%s", namespace, podName))
	if err != nil {
		return nil, err
	}

	if cg.Tags["NodeName"] != p.nodeName {
		return nil, errdefs.NotFound("got unexpected pod node name")
	}

	// get logs from cg
	retry := 10
	logContent := ""
	var retries int
	for retries = 0; retries < retry; retries++ {
		cLogs, err := p.aciClient.GetContainerLogs(ctx, p.resourceGroup, cg.Name, containerName, opts.Tail)
		if err != nil {
			log.G(ctx).WithField("method", "GetContainerLogs").WithError(err).Debug("Error getting container logs, retrying")
			time.Sleep(5000 * time.Millisecond)
		} else {
			logContent = cLogs.Content
			break
		}
	}
	return ioutil.NopCloser(strings.NewReader(logContent)), err
}

// GetPodFullName as defined in the provider context
func (p *ACIProvider) GetPodFullName(namespace string, pod string) string {
	return fmt.Sprintf("%s-%s", namespace, pod)
}

// RunInContainer executes a command in a container in the pod, copying data
// between in/out/err and the container's stdin/stdout/stderr.
func (p *ACIProvider) RunInContainer(ctx context.Context, namespace, name, container string, cmd []string, attach api.AttachIO) error {
	out := attach.Stdout()
	if out != nil {
		defer out.Close()
	}

	cg, _, err := p.aciClient.GetContainerGroup(ctx, p.resourceGroup, p.GetPodFullName(namespace, name))
	if err != nil {
		return err
	}

	// Set default terminal size
	size := api.TermSize{
		Height: 60,
		Width:  120,
	}

	resize := attach.Resize()
	if resize != nil {
		select {
		case size = <-resize:
		case <-ctx.Done():
			return ctx.Err()
		}
	}

	ts := aci.TerminalSizeRequest{Height: int(size.Height), Width: int(size.Width)}
	xcrsp, err := p.aciClient.LaunchExec(p.resourceGroup, cg.Name, container, cmd[0], ts)
	if err != nil {
		return err
	}

	wsURI := xcrsp.WebSocketURI
	password := xcrsp.Password

	c, _, _ := websocket.DefaultDialer.Dial(wsURI, nil)
	c.WriteMessage(websocket.TextMessage, []byte(password)) // Websocket password needs to be sent before WS terminal is active

	// Cleanup on exit
	defer c.Close()

	in := attach.Stdin()
	if in != nil {
		go func() {
			for {
				select {
				case <-ctx.Done():
					return
				default:
				}

				var msg = make([]byte, 512)
				n, err := in.Read(msg)
				if err == io.EOF {
					// Handle EOF
				}
				if err != nil {
					// Handle errors
					return
				}
				if n > 0 { // Only call WriteMessage if there is data to send
					c.WriteMessage(websocket.BinaryMessage, msg[:n])
				}
			}
		}()
	}

	if out != nil {
		for {
			select {
			case <-ctx.Done():
				break
			default:
			}

			_, cr, err := c.NextReader()
			if err != nil {
				// Handle errors
				break
			}
			io.Copy(out, cr)
		}
	}

	return ctx.Err()
}

// ConfigureNode enables a provider to configure the node object that
// will be used for Kubernetes.
func (p *ACIProvider) ConfigureNode(ctx context.Context, node *v1.Node) {
	node.Status.Capacity = p.capacity()
	node.Status.Allocatable = p.capacity()
	node.Status.Conditions = p.nodeConditions()
	node.Status.Addresses = p.nodeAddresses()
	node.Status.DaemonEndpoints = p.nodeDaemonEndpoints()
	node.Status.NodeInfo.OperatingSystem = p.operatingSystem
}

// GetPodStatus returns the status of a pod by name that is running inside ACI
// returns nil if a pod by that name is not found.
func (p *ACIProvider) GetPodStatus(ctx context.Context, namespace, name string) (*v1.PodStatus, error) {
	ctx, span := trace.StartSpan(ctx, "aci.GetPodStatus")
	defer span.End()
	ctx = addAzureAttributes(ctx, span, p)

	pod, err := p.GetPod(ctx, namespace, name)
	if err != nil {
		return nil, err
	}

	if pod == nil {
		return nil, nil
	}

	return &pod.Status, nil
}

// GetPods returns a list of all pods known to be running within ACI.
func (p *ACIProvider) GetPods(ctx context.Context) ([]*v1.Pod, error) {
	ctx, span := trace.StartSpan(ctx, "aci.GetPods")
	defer span.End()
	ctx = addAzureAttributes(ctx, span, p)

	cgs, err := p.aciClient.ListContainerGroups(ctx, p.resourceGroup)
	if err != nil {
		return nil, err
	}
	pods := make([]*v1.Pod, 0, len(cgs.Value))

	for _, cg := range cgs.Value {
		c := cg
		if cg.Tags["NodeName"] != p.nodeName {
			continue
		}

		p, err := containerGroupToPod(&c)
		if err != nil {
			log.G(ctx).WithFields(log.Fields{
				"name": c.Name,
				"id":   c.ID,
			}).WithError(err).Error("error converting container group to pod")

			continue
		}
		pods = append(pods, p)
	}

	return pods, nil
}

// capacity returns a resource list containing the capacity limits set for ACI.
func (p *ACIProvider) capacity() v1.ResourceList {
	resourceList := v1.ResourceList{
		v1.ResourceCPU:    resource.MustParse(p.cpu),
		v1.ResourceMemory: resource.MustParse(p.memory),
		v1.ResourcePods:   resource.MustParse(p.pods),
	}

	if p.gpu != "" {
		resourceList[gpuResourceName] = resource.MustParse(p.gpu)
	}

	return resourceList
}

// nodeConditions returns a list of conditions (Ready, OutOfDisk, etc), for updates to the node status
// within Kubernetes.
func (p *ACIProvider) nodeConditions() []v1.NodeCondition {
	// TODO: Make these dynamic and augment with custom ACI specific conditions of interest
	return []v1.NodeCondition{
		{
			Type:               "Ready",
			Status:             v1.ConditionTrue,
			LastHeartbeatTime:  metav1.Now(),
			LastTransitionTime: metav1.Now(),
			Reason:             "KubeletReady",
			Message:            "kubelet is ready.",
		},
		{
			Type:               "OutOfDisk",
			Status:             v1.ConditionFalse,
			LastHeartbeatTime:  metav1.Now(),
			LastTransitionTime: metav1.Now(),
			Reason:             "KubeletHasSufficientDisk",
			Message:            "kubelet has sufficient disk space available",
		},
		{
			Type:               "MemoryPressure",
			Status:             v1.ConditionFalse,
			LastHeartbeatTime:  metav1.Now(),
			LastTransitionTime: metav1.Now(),
			Reason:             "KubeletHasSufficientMemory",
			Message:            "kubelet has sufficient memory available",
		},
		{
			Type:               "DiskPressure",
			Status:             v1.ConditionFalse,
			LastHeartbeatTime:  metav1.Now(),
			LastTransitionTime: metav1.Now(),
			Reason:             "KubeletHasNoDiskPressure",
			Message:            "kubelet has no disk pressure",
		},
		{
			Type:               "NetworkUnavailable",
			Status:             v1.ConditionFalse,
			LastHeartbeatTime:  metav1.Now(),
			LastTransitionTime: metav1.Now(),
			Reason:             "RouteCreated",
			Message:            "RouteController created a route",
		},
	}
}

// nodeAddresses returns a list of addresses for the node status
// within Kubernetes.
func (p *ACIProvider) nodeAddresses() []v1.NodeAddress {
	// TODO: Make these dynamic and augment with custom ACI specific conditions of interest
	return []v1.NodeAddress{
		{
			Type:    "InternalIP",
			Address: p.internalIP,
		},
	}
}

// nodeDaemonEndpoints returns NodeDaemonEndpoints for the node status
// within Kubernetes.
func (p *ACIProvider) nodeDaemonEndpoints() v1.NodeDaemonEndpoints {
	return v1.NodeDaemonEndpoints{
		KubeletEndpoint: v1.DaemonEndpoint{
			Port: p.daemonEndpointPort,
		},
	}
}

func (p *ACIProvider) getImagePullSecrets(pod *v1.Pod) ([]aci.ImageRegistryCredential, error) {
	ips := make([]aci.ImageRegistryCredential, 0, len(pod.Spec.ImagePullSecrets))
	for _, ref := range pod.Spec.ImagePullSecrets {
		secret, err := p.resourceManager.GetSecret(ref.Name, pod.Namespace)
		if err != nil {
			return ips, err
		}
		if secret == nil {
			return nil, fmt.Errorf("error getting image pull secret")
		}
		// TODO: Check if secret type is v1.SecretTypeDockercfg and use DockerConfigKey instead of hardcoded value
		// TODO: Check if secret type is v1.SecretTypeDockerConfigJson and use DockerConfigJsonKey to determine if it's in json format
		// TODO: Return error if it's not one of these two types
		switch secret.Type {
		case v1.SecretTypeDockercfg:
			ips, err = readDockerCfgSecret(secret, ips)
		case v1.SecretTypeDockerConfigJson:
			ips, err = readDockerConfigJSONSecret(secret, ips)
		default:
			return nil, fmt.Errorf("image pull secret type is not one of kubernetes.io/dockercfg or kubernetes.io/dockerconfigjson")
		}

		if err != nil {
			return ips, err
		}

	}
	return ips, nil
}

func makeRegistryCredential(server string, authConfig AuthConfig) (*aci.ImageRegistryCredential, error) {
	username := authConfig.Username
	password := authConfig.Password

	if username == "" {
		if authConfig.Auth == "" {
			return nil, fmt.Errorf("no username present in auth config for server: %s", server)
		}

		decoded, err := base64.StdEncoding.DecodeString(authConfig.Auth)
		if err != nil {
			return nil, fmt.Errorf("error decoding the auth for server: %s Error: %v", server, err)
		}

		parts := strings.Split(string(decoded), ":")
		if len(parts) != 2 {
			return nil, fmt.Errorf("malformed auth for server: %s", server)
		}

		username = parts[0]
		password = parts[1]
	}

	cred := aci.ImageRegistryCredential{
		Server:   server,
		Username: username,
		Password: password,
	}

	return &cred, nil
}

func readDockerCfgSecret(secret *v1.Secret, ips []aci.ImageRegistryCredential) ([]aci.ImageRegistryCredential, error) {
	var err error
	var authConfigs map[string]AuthConfig
	repoData, ok := secret.Data[string(v1.DockerConfigKey)]

	if !ok {
		return ips, fmt.Errorf("no dockercfg present in secret")
	}

	err = json.Unmarshal(repoData, &authConfigs)
	if err != nil {
		return ips, err
	}

	for server := range authConfigs {
		cred, err := makeRegistryCredential(server, authConfigs[server])
		if err != nil {
			return ips, err
		}

		ips = append(ips, *cred)
	}

	return ips, err
}

func readDockerConfigJSONSecret(secret *v1.Secret, ips []aci.ImageRegistryCredential) ([]aci.ImageRegistryCredential, error) {
	var err error
	repoData, ok := secret.Data[string(v1.DockerConfigJsonKey)]

	if !ok {
		return ips, fmt.Errorf("no dockerconfigjson present in secret")
	}

	var authConfigs map[string]map[string]AuthConfig

	err = json.Unmarshal(repoData, &authConfigs)
	if err != nil {
		return ips, err
	}

	auths, ok := authConfigs["auths"]
	if !ok {
		return ips, fmt.Errorf("malformed dockerconfigjson in secret")
	}

	for server := range auths {
		cred, err := makeRegistryCredential(server, auths[server])
		if err != nil {
			return ips, err
		}

		ips = append(ips, *cred)
	}

	return ips, err
}

func (p *ACIProvider) getContainers(pod *v1.Pod) ([]aci.Container, error) {
	containers := make([]aci.Container, 0, len(pod.Spec.Containers))
	for _, container := range pod.Spec.Containers {

		if len(container.Command) == 0 && len(container.Args) > 0 {
			return nil, errdefs.InvalidInput("ACI does not support providing args without specifying the command. Please supply both command and args to the pod spec.")
		}
		c := aci.Container{
			Name: container.Name,
			ContainerProperties: aci.ContainerProperties{
				Image:   container.Image,
				Command: append(container.Command, container.Args...),
				Ports:   make([]aci.ContainerPort, 0, len(container.Ports)),
			},
		}

		for _, p := range container.Ports {
			c.Ports = append(c.Ports, aci.ContainerPort{
				Port:     p.ContainerPort,
				Protocol: getProtocol(p.Protocol),
			})
		}

		c.VolumeMounts = make([]aci.VolumeMount, 0, len(container.VolumeMounts))
		for _, v := range container.VolumeMounts {
			c.VolumeMounts = append(c.VolumeMounts, aci.VolumeMount{
				Name:      v.Name,
				MountPath: v.MountPath,
				ReadOnly:  v.ReadOnly,
			})
		}

		c.EnvironmentVariables = make([]aci.EnvironmentVariable, 0, len(container.Env))
		for _, e := range container.Env {
			if e.Value != "" {
				envVar := getACIEnvVar(e)
				c.EnvironmentVariables = append(c.EnvironmentVariables, envVar)
			}
		}

		// NOTE(robbiezhang): ACI CPU request must be times of 10m
		cpuRequest := 1.00
		if _, ok := container.Resources.Requests[v1.ResourceCPU]; ok {
			cpuRequest = float64(container.Resources.Requests.Cpu().MilliValue()/10.00) / 100.00
			if cpuRequest < 0.01 {
				cpuRequest = 0.01
			}
		}

		// NOTE(robbiezhang): ACI memory request must be times of 0.1 GB
		memoryRequest := 1.50
		if _, ok := container.Resources.Requests[v1.ResourceMemory]; ok {
			memoryRequest = float64(container.Resources.Requests.Memory().Value()/100000000.00) / 10.00
			if memoryRequest < 0.10 {
				memoryRequest = 0.10
			}
		}

		c.Resources = aci.ResourceRequirements{
			Requests: &aci.ComputeResources{
				CPU:        cpuRequest,
				MemoryInGB: memoryRequest,
			},
		}

		if container.Resources.Limits != nil {
			cpuLimit := cpuRequest
			if _, ok := container.Resources.Limits[v1.ResourceCPU]; ok {
				cpuLimit = float64(container.Resources.Limits.Cpu().MilliValue()) / 1000.00
			}

			// NOTE(jahstreet): ACI memory limit must be times of 0.1 GB
			memoryLimit := memoryRequest
			if _, ok := container.Resources.Limits[v1.ResourceMemory]; ok {
				memoryLimit = float64(container.Resources.Limits.Memory().Value()/100000000.00) / 10.00
			}
			c.Resources.Limits = &aci.ComputeResources{
				CPU:        cpuLimit,
				MemoryInGB: memoryLimit,
			}

			if gpu, ok := container.Resources.Limits[gpuResourceName]; ok {
				sku, err := p.getGPUSKU(pod)
				if err != nil {
					return nil, err
				}

				if gpu.Value() == 0 {
					return nil, errors.New("GPU must be a integer number")
				}

				gpuResource := &aci.GPUResource{
					Count: int32(gpu.Value()),
					SKU:   sku,
				}

				c.Resources.Requests.GPU = gpuResource
				c.Resources.Limits.GPU = gpuResource
			}
		}

		if container.LivenessProbe != nil {
			probe, err := getProbe(container.LivenessProbe, container.Ports)
			if err != nil {
				return nil, err
			}
			c.LivenessProbe = probe
		}

		if container.ReadinessProbe != nil {
			probe, err := getProbe(container.ReadinessProbe, container.Ports)
			if err != nil {
				return nil, err
			}
			c.ReadinessProbe = probe
		}

		containers = append(containers, c)
	}
	return containers, nil
}

func (p *ACIProvider) getGPUSKU(pod *v1.Pod) (aci.GPUSKU, error) {
	if len(p.gpuSKUs) == 0 {
		return "", fmt.Errorf("The pod requires GPU resource, but ACI doesn't provide GPU enabled container group in region %s", p.region)
	}

	if desiredSKU, ok := pod.Annotations[gpuTypeAnnotation]; ok {
		for _, supportedSKU := range p.gpuSKUs {
			if strings.EqualFold(string(desiredSKU), string(supportedSKU)) {
				return supportedSKU, nil
			}
		}

		return "", fmt.Errorf("The pod requires GPU SKU %s, but ACI only supports SKUs %v in region %s", desiredSKU, p.region, p.gpuSKUs)
	}

	return p.gpuSKUs[0], nil
}

func getProbe(probe *v1.Probe, ports []v1.ContainerPort) (*aci.ContainerProbe, error) {

	if probe.Handler.Exec != nil && probe.Handler.HTTPGet != nil {
		return nil, fmt.Errorf("probe may not specify more than one of \"exec\" and \"httpGet\"")
	}

	if probe.Handler.Exec == nil && probe.Handler.HTTPGet == nil {
		return nil, fmt.Errorf("probe must specify one of \"exec\" and \"httpGet\"")
	}

	// Probes have can have a Exec or HTTP Get Handler.
	// Create those if they exist, then add to the
	// ContainerProbe struct
	var exec *aci.ContainerExecProbe
	if probe.Handler.Exec != nil {
		exec = &aci.ContainerExecProbe{
			Command: probe.Handler.Exec.Command,
		}
	}

	var httpGET *aci.ContainerHTTPGetProbe
	if probe.Handler.HTTPGet != nil {
		var portValue int
		port := probe.Handler.HTTPGet.Port
		switch port.Type {
		case intstr.Int:
			portValue = port.IntValue()
		case intstr.String:
			portName := port.String()
			for _, p := range ports {
				if portName == p.Name {
					portValue = int(p.ContainerPort)
					break
				}
			}
			if portValue == 0 {
				return nil, fmt.Errorf("unable to find named port: %s", portName)
			}
		}

		httpGET = &aci.ContainerHTTPGetProbe{
			Port:   portValue,
			Path:   probe.Handler.HTTPGet.Path,
			Scheme: string(probe.Handler.HTTPGet.Scheme),
		}
	}

	return &aci.ContainerProbe{
		Exec:                exec,
		HTTPGet:             httpGET,
		InitialDelaySeconds: probe.InitialDelaySeconds,
		Period:              probe.PeriodSeconds,
		FailureThreshold:    probe.FailureThreshold,
		SuccessThreshold:    probe.SuccessThreshold,
		TimeoutSeconds:      probe.TimeoutSeconds,
	}, nil
}

func (p *ACIProvider) getVolumes(pod *v1.Pod) ([]aci.Volume, error) {
	volumes := make([]aci.Volume, 0, len(pod.Spec.Volumes))
	for _, v := range pod.Spec.Volumes {
		// Handle the case for the AzureFile volume.
		if v.AzureFile != nil {
			secret, err := p.resourceManager.GetSecret(v.AzureFile.SecretName, pod.Namespace)
			if err != nil {
				return volumes, err
			}

			if secret == nil {
				return nil, fmt.Errorf("Getting secret for AzureFile volume returned an empty secret")
			}

			volumes = append(volumes, aci.Volume{
				Name: v.Name,
				AzureFile: &aci.AzureFileVolume{
					ShareName:          v.AzureFile.ShareName,
					ReadOnly:           v.AzureFile.ReadOnly,
					StorageAccountName: string(secret.Data["azurestorageaccountname"]),
					StorageAccountKey:  string(secret.Data["azurestorageaccountkey"]),
				},
			})
			continue
		}

		// Handle the case for the EmptyDir.
		if v.EmptyDir != nil {
			volumes = append(volumes, aci.Volume{
				Name:     v.Name,
				EmptyDir: map[string]interface{}{},
			})
			continue
		}

		// Handle the case for GitRepo volume.
		if v.GitRepo != nil {
			volumes = append(volumes, aci.Volume{
				Name: v.Name,
				GitRepo: &aci.GitRepoVolume{
					Directory:  v.GitRepo.Directory,
					Repository: v.GitRepo.Repository,
					Revision:   v.GitRepo.Revision,
				},
			})
			continue
		}

		// Handle the case for Secret volume.
		if v.Secret != nil {
			paths := make(map[string]string)
			secret, err := p.resourceManager.GetSecret(v.Secret.SecretName, pod.Namespace)
			if v.Secret.Optional != nil && !*v.Secret.Optional && k8serr.IsNotFound(err) {
				return nil, fmt.Errorf("Secret %s is required by Pod %s and does not exist", v.Secret.SecretName, pod.Name)
			}
			if secret == nil {
				continue
			}

			for k, v := range secret.Data {
				paths[k] = base64.StdEncoding.EncodeToString(v)
			}

			if len(paths) != 0 {
				volumes = append(volumes, aci.Volume{
					Name:   v.Name,
					Secret: paths,
				})
			}
			continue
		}

		// Handle the case for ConfigMap volume.
		if v.ConfigMap != nil {
			paths := make(map[string]string)
			configMap, err := p.resourceManager.GetConfigMap(v.ConfigMap.Name, pod.Namespace)
			if v.ConfigMap.Optional != nil && !*v.ConfigMap.Optional && k8serr.IsNotFound(err) {
				return nil, fmt.Errorf("ConfigMap %s is required by Pod %s and does not exist", v.ConfigMap.Name, pod.Name)
			}
			if configMap == nil {
				continue
			}

			for k, v := range configMap.Data {
				paths[k] = base64.StdEncoding.EncodeToString([]byte(v))
			}
			for k, v := range configMap.BinaryData {
				paths[k] = base64.StdEncoding.EncodeToString(v)
			}

			if len(paths) != 0 {
				volumes = append(volumes, aci.Volume{
					Name:   v.Name,
					Secret: paths,
				})
			}
			continue
		}

		// If we've made it this far we have found a volume type that isn't supported
		return nil, fmt.Errorf("Pod %s requires volume %s which is of an unsupported type", pod.Name, v.Name)
	}

	return volumes, nil
}

func getProtocol(pro v1.Protocol) aci.ContainerNetworkProtocol {
	switch pro {
	case v1.ProtocolUDP:
		return aci.ContainerNetworkProtocolUDP
	default:
		return aci.ContainerNetworkProtocolTCP
	}
}

func containerGroupToPod(cg *aci.ContainerGroup) (*v1.Pod, error) {
	var podCreationTimestamp metav1.Time

	if cg.Tags["CreationTimestamp"] != "" {
		t, err := time.Parse("2006-01-02 15:04:05.999999999 -0700 MST", cg.Tags["CreationTimestamp"])
		if err != nil {
			return nil, err
		}
		podCreationTimestamp = metav1.NewTime(t)
	}
	containerStartTime := metav1.NewTime(time.Time(cg.Containers[0].ContainerProperties.InstanceView.CurrentState.StartTime))

	// Use the Provisioning State if it's not Succeeded,
	// otherwise use the state of the instance.
	aciState := cg.ContainerGroupProperties.ProvisioningState
	if aciState == "Succeeded" {
		aciState = cg.ContainerGroupProperties.InstanceView.State
	}

	containers := make([]v1.Container, 0, len(cg.Containers))
	containerStatuses := make([]v1.ContainerStatus, 0, len(cg.Containers))
	for _, c := range cg.Containers {
		container := v1.Container{
			Name:    c.Name,
			Image:   c.Image,
			Command: c.Command,
			Resources: v1.ResourceRequirements{
				Requests: v1.ResourceList{
					v1.ResourceCPU:    resource.MustParse(fmt.Sprintf("%g", c.Resources.Requests.CPU)),
					v1.ResourceMemory: resource.MustParse(fmt.Sprintf("%gG", c.Resources.Requests.MemoryInGB)),
				},
			},
		}

		if c.Resources.Requests.GPU != nil {
			container.Resources.Requests[gpuResourceName] = resource.MustParse(fmt.Sprintf("%d", c.Resources.Requests.GPU.Count))
		}

		if c.Resources.Limits != nil {
			container.Resources.Limits = v1.ResourceList{
				v1.ResourceCPU:    resource.MustParse(fmt.Sprintf("%g", c.Resources.Limits.CPU)),
				v1.ResourceMemory: resource.MustParse(fmt.Sprintf("%gG", c.Resources.Limits.MemoryInGB)),
			}

			if c.Resources.Limits.GPU != nil {
				container.Resources.Limits[gpuResourceName] = resource.MustParse(fmt.Sprintf("%d", c.Resources.Requests.GPU.Count))
			}
		}

		containers = append(containers, container)
		containerStatus := v1.ContainerStatus{
			Name:                 c.Name,
			State:                aciContainerStateToContainerState(c.InstanceView.CurrentState),
			LastTerminationState: aciContainerStateToContainerState(c.InstanceView.PreviousState),
			Ready:                aciStateToPodPhase(c.InstanceView.CurrentState.State) == v1.PodRunning,
			RestartCount:         c.InstanceView.RestartCount,
			Image:                c.Image,
			ImageID:              "",
			ContainerID:          getContainerID(cg.ID, c.Name),
		}

		// Add to containerStatuses
		containerStatuses = append(containerStatuses, containerStatus)
	}

	ip := ""
	if cg.IPAddress != nil {
		ip = cg.IPAddress.IP
	}

	p := v1.Pod{
		TypeMeta: metav1.TypeMeta{
			Kind:       "Pod",
			APIVersion: "v1",
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:              cg.Tags["PodName"],
			Namespace:         cg.Tags["Namespace"],
			ClusterName:       cg.Tags["ClusterName"],
			UID:               types.UID(cg.Tags["UID"]),
			CreationTimestamp: podCreationTimestamp,
		},
		Spec: v1.PodSpec{
			NodeName:   cg.Tags["NodeName"],
			Volumes:    []v1.Volume{},
			Containers: containers,
		},
		Status: v1.PodStatus{
			Phase:             aciStateToPodPhase(aciState),
			Conditions:        aciStateToPodConditions(aciState, podCreationTimestamp),
			Message:           "",
			Reason:            "",
			HostIP:            "",
			PodIP:             ip,
			StartTime:         &containerStartTime,
			ContainerStatuses: containerStatuses,
		},
	}

	return &p, nil
}

func getContainerID(cgID, containerName string) string {
	if cgID == "" {
		return ""
	}

	containerResourceID := fmt.Sprintf("%s/containers/%s", cgID, containerName)

	h := sha256.New()
	h.Write([]byte(strings.ToUpper(containerResourceID)))
	hashBytes := h.Sum(nil)
	return fmt.Sprintf("aci://%s", hex.EncodeToString(hashBytes))
}

func aciStateToPodPhase(state string) v1.PodPhase {
	switch state {
	case "Running":
		return v1.PodRunning
	case "Succeeded":
		return v1.PodSucceeded
	case "Failed":
		return v1.PodFailed
	case "Canceled":
		return v1.PodFailed
	case "Creating":
		return v1.PodPending
	case "Repairing":
		return v1.PodPending
	case "Pending":
		return v1.PodPending
	case "Accepted":
		return v1.PodPending
	}

	return v1.PodUnknown
}

func aciStateToPodConditions(state string, transitiontime metav1.Time) []v1.PodCondition {
	switch state {
	case "Running", "Succeeded":
		return []v1.PodCondition{
			v1.PodCondition{
				Type:               v1.PodReady,
				Status:             v1.ConditionTrue,
				LastTransitionTime: transitiontime,
			}, v1.PodCondition{
				Type:               v1.PodInitialized,
				Status:             v1.ConditionTrue,
				LastTransitionTime: transitiontime,
			}, v1.PodCondition{
				Type:               v1.PodScheduled,
				Status:             v1.ConditionTrue,
				LastTransitionTime: transitiontime,
			},
		}
	}
	return []v1.PodCondition{}
}

func aciContainerStateToContainerState(cs aci.ContainerState) v1.ContainerState {
	startTime := metav1.NewTime(time.Time(cs.StartTime))

	// Handle the case where the container is running.
	if cs.State == "Running" || cs.State == "Succeeded" {
		return v1.ContainerState{
			Running: &v1.ContainerStateRunning{
				StartedAt: startTime,
			},
		}
	}

	// Handle the case where the container failed.
	if cs.State == "Failed" || cs.State == "Canceled" {
		return v1.ContainerState{
			Terminated: &v1.ContainerStateTerminated{
				ExitCode:   cs.ExitCode,
				Reason:     cs.State,
				Message:    cs.DetailStatus,
				StartedAt:  startTime,
				FinishedAt: metav1.NewTime(time.Time(cs.FinishTime)),
			},
		}
	}

	state := cs.State
	if state == "" {
		state = "Creating"
	}

	// Handle the case where the container is pending.
	// Which should be all other aci states.
	return v1.ContainerState{
		Waiting: &v1.ContainerStateWaiting{
			Reason:  state,
			Message: cs.DetailStatus,
		},
	}
}

// Filters service account secret volume for Windows.
// Service account secret volume gets automatically turned on if not specified otherwise.
// ACI doesn't support secret volume for Windows, so we need to filter it.
func filterServiceAccountSecretVolume(osType string, containerGroup *aci.ContainerGroup) {
	if strings.EqualFold(osType, "Windows") {
		serviceAccountSecretVolumeName := make(map[string]bool)

		for index, container := range containerGroup.ContainerGroupProperties.Containers {
			volumeMounts := make([]aci.VolumeMount, 0, len(container.VolumeMounts))
			for _, volumeMount := range container.VolumeMounts {
				if !strings.EqualFold(serviceAccountSecretMountPath, volumeMount.MountPath) {
					volumeMounts = append(volumeMounts, volumeMount)
				} else {
					serviceAccountSecretVolumeName[volumeMount.Name] = true
				}
			}
			containerGroup.ContainerGroupProperties.Containers[index].VolumeMounts = volumeMounts
		}

		if len(serviceAccountSecretVolumeName) == 0 {
			return
		}

		l := log.G(context.TODO()).WithField("containerGroup", containerGroup.Name)
		l.Infof("Ignoring service account secret volumes '%v' for Windows", reflect.ValueOf(serviceAccountSecretVolumeName).MapKeys())

		volumes := make([]aci.Volume, 0, len(containerGroup.ContainerGroupProperties.Volumes))
		for _, volume := range containerGroup.ContainerGroupProperties.Volumes {
			if _, ok := serviceAccountSecretVolumeName[volume.Name]; !ok {
				volumes = append(volumes, volume)
			}
		}

		containerGroup.ContainerGroupProperties.Volumes = volumes
	}
}

func getACIEnvVar(e v1.EnvVar) aci.EnvironmentVariable {
	var envVar aci.EnvironmentVariable
	// If the variable is a secret, use SecureValue
	if e.ValueFrom != nil && e.ValueFrom.SecretKeyRef != nil {
		envVar = aci.EnvironmentVariable{
			Name:        e.Name,
			SecureValue: e.Value,
		}
	} else {
		envVar = aci.EnvironmentVariable{
			Name:  e.Name,
			Value: e.Value,
		}
	}
	return envVar
}