cost-model/cloud/awsprovider.go

package cloud

import (
	"bytes"
	"compress/gzip"
	"encoding/csv"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"regexp"
	"strconv"
	"strings"
	"sync"
	"time"

	"k8s.io/klog"

	"github.com/kubecost/cost-model/clustercache"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/awserr"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/athena"
	"github.com/aws/aws-sdk-go/service/ec2"
	"github.com/aws/aws-sdk-go/service/s3"
	"github.com/aws/aws-sdk-go/service/s3/s3manager"
	"github.com/jszwec/csvutil"

	v1 "k8s.io/api/core/v1"
)

const awsAccessKeyIDEnvVar = "AWS_ACCESS_KEY_ID"
const awsAccessKeySecretEnvVar = "AWS_SECRET_ACCESS_KEY"
const supportedSpotFeedVersion = "1"
const SpotInfoUpdateType = "spotinfo"
const AthenaInfoUpdateType = "athenainfo"

// AWS represents an Amazon Provider
type AWS struct {
	Pricing                 map[string]*AWSProductTerms
	SpotPricingByInstanceID map[string]*spotInfo
	ValidPricingKeys        map[string]bool
	Clientset               clustercache.ClusterCache
	BaseCPUPrice            string
	BaseRAMPrice            string
	BaseGPUPrice            string
	BaseSpotCPUPrice        string
	BaseSpotRAMPrice        string
	SpotLabelName           string
	SpotLabelValue          string
	ServiceKeyName          string
	ServiceKeySecret        string
	SpotDataRegion          string
	SpotDataBucket          string
	SpotDataPrefix          string
	ProjectID               string
	DownloadPricingDataLock sync.RWMutex
	*CustomProvider
}

// AWSPricing maps a k8s node to an AWS Pricing "product"
type AWSPricing struct {
	Products map[string]*AWSProduct `json:"products"`
	Terms    AWSPricingTerms        `json:"terms"`
}

// AWSProduct represents a purchased SKU
type AWSProduct struct {
	Sku        string               `json:"sku"`
	Attributes AWSProductAttributes `json:"attributes"`
}

// AWSProductAttributes represents metadata about the product used to map to a node.
type AWSProductAttributes struct {
	Location        string `json:"location"`
	InstanceType    string `json:"instanceType"`
	Memory          string `json:"memory"`
	Storage         string `json:"storage"`
	VCpu            string `json:"vcpu"`
	UsageType       string `json:"usagetype"`
	OperatingSystem string `json:"operatingSystem"`
	PreInstalledSw  string `json:"preInstalledSw"`
	InstanceFamily  string `json:"instanceFamily"`
	GPU             string `json:"gpu"` // GPU represents the number of GPU on the instance
}

// AWSPricingTerms are how you pay for the node: OnDemand, Reserved, or (TODO) Spot
type AWSPricingTerms struct {
	OnDemand map[string]map[string]*AWSOfferTerm `json:"OnDemand"`
	Reserved map[string]map[string]*AWSOfferTerm `json:"Reserved"`
}

// AWSOfferTerm is a sku extension used to pay for the node.
type AWSOfferTerm struct {
	Sku             string                  `json:"sku"`
	PriceDimensions map[string]*AWSRateCode `json:"priceDimensions"`
}

// AWSRateCode encodes data about the price of a product
type AWSRateCode struct {
	Unit         string          `json:"unit"`
	PricePerUnit AWSCurrencyCode `json:"pricePerUnit"`
}

// AWSCurrencyCode is the localized currency. (TODO: support non-USD)
type AWSCurrencyCode struct {
	USD string `json:"USD"`
}

// AWSProductTerms represents the full terms of the product
type AWSProductTerms struct {
	Sku      string        `json:"sku"`
	OnDemand *AWSOfferTerm `json:"OnDemand"`
	Reserved *AWSOfferTerm `json:"Reserved"`
	Memory   string        `json:"memory"`
	Storage  string        `json:"storage"`
	VCpu     string        `json:"vcpu"`
	GPU      string        `json:"gpu"` // GPU represents the number of GPU on the instance
	PV       *PV           `json:"pv"`
}

// ClusterIdEnvVar is the environment variable in which one can manually set the ClusterId
const ClusterIdEnvVar = "AWS_CLUSTER_ID"

// OnDemandRateCode is appended to an node sku
const OnDemandRateCode = ".JRTCKXETXF"

// ReservedRateCode is appended to a node sku
const ReservedRateCode = ".38NPMPTW36"

// HourlyRateCode is appended to a node sku
const HourlyRateCode = ".6YS6EN2CT7"

// volTypes are used to map between AWS UsageTypes and
// EBS volume types, as they would appear in K8s storage class
// name and the EC2 API.
var volTypes = map[string]string{
	"EBS:VolumeUsage.gp2":    "gp2",
	"EBS:VolumeUsage":        "standard",
	"EBS:VolumeUsage.sc1":    "sc1",
	"EBS:VolumeP-IOPS.piops": "io1",
	"EBS:VolumeUsage.st1":    "st1",
	"EBS:VolumeUsage.piops":  "io1",
	"gp2":                    "EBS:VolumeUsage.gp2",
	"standard":               "EBS:VolumeUsage",
	"sc1":                    "EBS:VolumeUsage.sc1",
	"io1":                    "EBS:VolumeUsage.piops",
	"st1":                    "EBS:VolumeUsage.st1",
}

// locationToRegion maps AWS region names (As they come from Billing)
// to actual region identifiers
var locationToRegion = map[string]string{
	"US East (Ohio)":             "us-east-2",
	"US East (N. Virginia)":      "us-east-1",
	"US West (N. California)":    "us-west-1",
	"US West (Oregon)":           "us-west-2",
	"Asia Pacific (Hong Kong)":   "ap-east-1",
	"Asia Pacific (Mumbai)":      "ap-south-1",
	"Asia Pacific (Osaka-Local)": "ap-northeast-3",
	"Asia Pacific (Seoul)":       "ap-northeast-2",
	"Asia Pacific (Singapore)":   "ap-southeast-1",
	"Asia Pacific (Sydney)":      "ap-southeast-2",
	"Asia Pacific (Tokyo)":       "ap-northeast-1",
	"Canada (Central)":           "ca-central-1",
	"China (Beijing)":            "cn-north-1",
	"China (Ningxia)":            "cn-northwest-1",
	"EU (Frankfurt)":             "eu-central-1",
	"EU (Ireland)":               "eu-west-1",
	"EU (London)":                "eu-west-2",
	"EU (Paris)":                 "eu-west-3",
	"EU (Stockholm)":             "eu-north-1",
	"South America (Sao Paulo)":  "sa-east-1",
	"AWS GovCloud (US-East)":     "us-gov-east-1",
	"AWS GovCloud (US)":          "us-gov-west-1",
}

var regionToBillingRegionCode = map[string]string{
	"us-east-2":      "USE2",
	"us-east-1":      "",
	"us-west-1":      "USW1",
	"us-west-2":      "USW2",
	"ap-east-1":      "APE1",
	"ap-south-1":     "APS3",
	"ap-northeast-3": "APN3",
	"ap-northeast-2": "APN2",
	"ap-southeast-1": "APS1",
	"ap-southeast-2": "APS2",
	"ap-northeast-1": "APN1",
	"ca-central-1":   "CAN1",
	"cn-north-1":     "",
	"cn-northwest-1": "",
	"eu-central-1":   "EUC1",
	"eu-west-1":      "EU",
	"eu-west-2":      "EUW2",
	"eu-west-3":      "EUW3",
	"eu-north-1":     "EUN1",
	"sa-east-1":      "SAE1",
	"us-gov-east-1":  "UGE1",
	"us-gov-west-1":  "UGW1",
}

func (aws *AWS) GetLocalStorageQuery(offset string) (string, error) {
	return "", nil
}

// KubeAttrConversion maps the k8s labels for region to an aws region
func (aws *AWS) KubeAttrConversion(location, instanceType, operatingSystem string) string {
	operatingSystem = strings.ToLower(operatingSystem)

	region := locationToRegion[location]
	return region + "," + instanceType + "," + operatingSystem
}

type AwsSpotFeedInfo struct {
	BucketName       string `json:"bucketName"`
	Prefix           string `json:"prefix"`
	Region           string `json:"region"`
	AccountID        string `json:"projectID"`
	ServiceKeyName   string `json:"serviceKeyName"`
	ServiceKeySecret string `json:"serviceKeySecret"`
	SpotLabel        string `json:"spotLabel"`
	SpotLabelValue   string `json:"spotLabelValue"`
}

type AwsAthenaInfo struct {
	AthenaBucketName string `json:"athenaBucketName"`
	AthenaRegion     string `json:"athenaRegion"`
	AthenaDatabase   string `json:"athenaDatabase"`
	AthenaTable      string `json:"athenaTable"`
	ServiceKeyName   string `json:"serviceKeyName"`
	ServiceKeySecret string `json:"serviceKeySecret"`
	AccountID        string `json:"projectID"`
}

func (aws *AWS) GetManagementPlatform() (string, error) {
	nodes := aws.Clientset.GetAllNodes()

	if len(nodes) > 0 {
		n := nodes[0]
		version := n.Status.NodeInfo.KubeletVersion
		if strings.Contains(version, "eks") {
			return "eks", nil
		}
		if _, ok := n.Labels["kops.k8s.io/instancegroup"]; ok {
			return "kops", nil
		}
	}
	return "", nil
}

func (aws *AWS) GetConfig() (*CustomPricing, error) {
	c, err := GetDefaultPricingData("aws.json")
	if c.Discount == "" {
		c.Discount = "0%"
	}
	if err != nil {
		return nil, err
	}
	return c, nil
}

func (aws *AWS) UpdateConfig(r io.Reader, updateType string) (*CustomPricing, error) {
	c, err := GetDefaultPricingData("aws.json")
	if err != nil {
		return nil, err
	}
	if updateType == SpotInfoUpdateType {
		a := AwsSpotFeedInfo{}
		err := json.NewDecoder(r).Decode(&a)
		if err != nil {
			return nil, err
		}

		if err != nil {
			return nil, err
		}
		c.ServiceKeyName = a.ServiceKeyName
		c.ServiceKeySecret = a.ServiceKeySecret
		c.SpotDataPrefix = a.Prefix
		c.SpotDataBucket = a.BucketName
		c.ProjectID = a.AccountID
		c.SpotDataRegion = a.Region
		c.SpotLabel = a.SpotLabel
		c.SpotLabelValue = a.SpotLabelValue

	} else if updateType == AthenaInfoUpdateType {
		a := AwsAthenaInfo{}
		err := json.NewDecoder(r).Decode(&a)
		if err != nil {
			return nil, err
		}
		c.AthenaBucketName = a.AthenaBucketName
		c.AthenaRegion = a.AthenaRegion
		c.AthenaDatabase = a.AthenaDatabase
		c.AthenaTable = a.AthenaTable
		c.ServiceKeyName = a.ServiceKeyName
		c.ServiceKeySecret = a.ServiceKeySecret
		c.ProjectID = a.AccountID
	} else {
		a := make(map[string]string)
		err = json.NewDecoder(r).Decode(&a)
		if err != nil {
			return nil, err
		}
		for k, v := range a {
			kUpper := strings.Title(k) // Just so we consistently supply / receive the same values, uppercase the first letter.
			err := SetCustomPricingField(c, kUpper, v)
			if err != nil {
				return nil, err
			}
		}
	}
	cj, err := json.Marshal(c)
	if err != nil {
		return nil, err
	}
	path := os.Getenv("CONFIG_PATH")
	if path == "" {
		path = "/models/"
	}
	path += "aws.json"
	remoteEnabled := os.Getenv(remoteEnabled)
	if remoteEnabled == "true" {
		err = UpdateClusterMeta(os.Getenv(clusterIDKey), c.ClusterName)
		if err != nil {
			return nil, err
		}
	}
	err = ioutil.WriteFile(path, cj, 0644)
	if err != nil {
		return nil, err
	}
	return c, nil
}

type awsKey struct {
	SpotLabelName  string
	SpotLabelValue string
	Labels         map[string]string
	ProviderID     string
}

func (k *awsKey) GPUType() string {
	return ""
}

func (k *awsKey) ID() string {
	provIdRx := regexp.MustCompile("aws:///([^/]+)/([^/]+)") // It's of the form aws:///us-east-2a/i-0fea4fd46592d050b and we want i-0fea4fd46592d050b, if it exists
	for matchNum, group := range provIdRx.FindStringSubmatch(k.ProviderID) {
		if matchNum == 2 {
			return group
		}
	}
	klog.V(3).Infof("Could not find instance ID in \"%s\"", k.ProviderID)
	return ""
}

func (k *awsKey) Features() string {

	instanceType := k.Labels[v1.LabelInstanceType]
	var operatingSystem string
	operatingSystem, ok := k.Labels[v1.LabelOSStable]
	if !ok {
		operatingSystem = k.Labels["beta.kubernetes.io/os"]
	}
	region := k.Labels[v1.LabelZoneRegion]

	key := region + "," + instanceType + "," + operatingSystem
	usageType := "preemptible"
	spotKey := key + "," + usageType
	if l, ok := k.Labels["lifecycle"]; ok && l == "EC2Spot" {
		return spotKey
	}
	if l, ok := k.Labels[k.SpotLabelName]; ok && l == k.SpotLabelValue {
		return spotKey
	}
	return key
}

func (aws *AWS) PVPricing(pvk PVKey) (*PV, error) {
	pricing, ok := aws.Pricing[pvk.Features()]
	if !ok {
		klog.V(4).Infof("Persistent Volume pricing not found for %s: %s", pvk.GetStorageClass(), pvk.Features())
		return &PV{}, nil
	}
	return pricing.PV, nil
}

type awsPVKey struct {
	Labels                 map[string]string
	StorageClassParameters map[string]string
	StorageClassName       string
	Name                   string
}

func (aws *AWS) GetPVKey(pv *v1.PersistentVolume, parameters map[string]string) PVKey {
	return &awsPVKey{
		Labels:                 pv.Labels,
		StorageClassName:       pv.Spec.StorageClassName,
		StorageClassParameters: parameters,
		Name:                   pv.Name,
	}
}

func (key *awsPVKey) GetStorageClass() string {
	return key.StorageClassName
}

func (key *awsPVKey) Features() string {
	storageClass := key.StorageClassParameters["type"]
	if storageClass == "standard" {
		storageClass = "gp2"
	}
	// Storage class names are generally EBS volume types (gp2)
	// Keys in Pricing are based on UsageTypes (EBS:VolumeType.gp2)
	// Converts between the 2
	region := key.Labels[v1.LabelZoneRegion]
	//if region == "" {
	//	region = "us-east-1"
	//}
	class, ok := volTypes[storageClass]
	if !ok {
		klog.V(4).Infof("No voltype mapping for %s's storageClass: %s", key.Name, storageClass)
	}
	return region + "," + class
}

// GetKey maps node labels to information needed to retrieve pricing data
func (aws *AWS) GetKey(labels map[string]string) Key {
	return &awsKey{
		SpotLabelName:  aws.SpotLabelName,
		SpotLabelValue: aws.SpotLabelValue,
		Labels:         labels,
		ProviderID:     labels["providerID"],
	}
}

func (aws *AWS) isPreemptible(key string) bool {
	s := strings.Split(key, ",")
	if len(s) == 4 && s[3] == "preemptible" {
		return true
	}
	return false
}

// DownloadPricingData fetches data from the AWS Pricing API
func (aws *AWS) DownloadPricingData() error {
	aws.DownloadPricingDataLock.Lock()
	defer aws.DownloadPricingDataLock.Unlock()
	c, err := GetDefaultPricingData("aws.json")
	if err != nil {
		klog.V(1).Infof("Error downloading default pricing data: %s", err.Error())
	}
	aws.BaseCPUPrice = c.CPU
	aws.BaseRAMPrice = c.RAM
	aws.BaseGPUPrice = c.GPU
	aws.BaseSpotCPUPrice = c.SpotCPU
	aws.BaseSpotRAMPrice = c.SpotRAM
	aws.SpotLabelName = c.SpotLabel
	aws.SpotLabelValue = c.SpotLabelValue
	aws.SpotDataBucket = c.SpotDataBucket
	aws.SpotDataPrefix = c.SpotDataPrefix
	aws.ProjectID = c.ProjectID
	aws.SpotDataRegion = c.SpotDataRegion
	aws.ServiceKeyName = c.ServiceKeyName
	aws.ServiceKeySecret = c.ServiceKeySecret

	if len(aws.SpotDataBucket) != 0 && len(aws.ProjectID) == 0 {
		klog.V(1).Infof("using SpotDataBucket \"%s\" without ProjectID will not end well", aws.SpotDataBucket)
	}
	nodeList := aws.Clientset.GetAllNodes()

	inputkeys := make(map[string]bool)
	for _, n := range nodeList {
		labels := n.GetObjectMeta().GetLabels()
		key := aws.GetKey(labels)
		inputkeys[key.Features()] = true
	}

	pvList := aws.Clientset.GetAllPersistentVolumes()

	storageClasses := aws.Clientset.GetAllStorageClasses()
	storageClassMap := make(map[string]map[string]string)
	for _, storageClass := range storageClasses {
		params := storageClass.Parameters
		storageClassMap[storageClass.ObjectMeta.Name] = params
		if storageClass.GetAnnotations()["storageclass.kubernetes.io/is-default-class"] == "true" || storageClass.GetAnnotations()["storageclass.beta.kubernetes.io/is-default-class"] == "true" {
			storageClassMap["default"] = params
			storageClassMap[""] = params
		}
	}

	pvkeys := make(map[string]PVKey)
	for _, pv := range pvList {
		params, ok := storageClassMap[pv.Spec.StorageClassName]
		if !ok {
			klog.V(2).Infof("Unable to find params for storageClassName %s, falling back to default pricing", pv.Spec.StorageClassName)
			continue
		}
		key := aws.GetPVKey(pv, params)
		pvkeys[key.Features()] = key
	}

	aws.Pricing = make(map[string]*AWSProductTerms)
	aws.ValidPricingKeys = make(map[string]bool)
	skusToKeys := make(map[string]string)

	pricingURL := "https://pricing.us-east-1.amazonaws.com/offers/v1.0/aws/AmazonEC2/current/index.json"
	klog.V(2).Infof("starting download of \"%s\", which is quite large ...", pricingURL)
	resp, err := http.Get(pricingURL)
	if err != nil {
		klog.V(2).Infof("Bogus fetch of \"%s\": %v", pricingURL, err)
		return err
	}
	klog.V(2).Infof("Finished downloading \"%s\"", pricingURL)

	dec := json.NewDecoder(resp.Body)
	for {
		t, err := dec.Token()
		if err == io.EOF {
			klog.V(2).Infof("done loading \"%s\"\n", pricingURL)
			break
		}
		if t == "products" {
			_, err := dec.Token() // this should parse the opening "{""
			if err != nil {
				return err
			}
			for dec.More() {
				_, err := dec.Token() // the sku token
				if err != nil {
					return err
				}
				product := &AWSProduct{}

				err = dec.Decode(&product)
				if err != nil {
					klog.V(1).Infof("Error parsing response from \"%s\": %v", pricingURL, err.Error())
					break
				}

				if product.Attributes.PreInstalledSw == "NA" &&
					(strings.HasPrefix(product.Attributes.UsageType, "BoxUsage") || strings.Contains(product.Attributes.UsageType, "-BoxUsage")) {
					key := aws.KubeAttrConversion(product.Attributes.Location, product.Attributes.InstanceType, product.Attributes.OperatingSystem)
					spotKey := key + ",preemptible"
					if inputkeys[key] || inputkeys[spotKey] { // Just grab the sku even if spot, and change the price later.
						productTerms := &AWSProductTerms{
							Sku:     product.Sku,
							Memory:  product.Attributes.Memory,
							Storage: product.Attributes.Storage,
							VCpu:    product.Attributes.VCpu,
							GPU:     product.Attributes.GPU,
						}
						aws.Pricing[key] = productTerms
						aws.Pricing[spotKey] = productTerms
						skusToKeys[product.Sku] = key
					}
					aws.ValidPricingKeys[key] = true
					aws.ValidPricingKeys[spotKey] = true
				} else if strings.Contains(product.Attributes.UsageType, "EBS:Volume") {
					// UsageTypes may be prefixed with a region code - we're removing this when using
					// volTypes to keep lookups generic
					usageTypeRegx := regexp.MustCompile(".*(-|^)(EBS.+)")
					usageTypeMatch := usageTypeRegx.FindStringSubmatch(product.Attributes.UsageType)
					usageTypeNoRegion := usageTypeMatch[len(usageTypeMatch)-1]
					key := locationToRegion[product.Attributes.Location] + "," + usageTypeNoRegion
					spotKey := key + ",preemptible"
					pv := &PV{
						Class:  volTypes[usageTypeNoRegion],
						Region: locationToRegion[product.Attributes.Location],
					}
					productTerms := &AWSProductTerms{
						Sku: product.Sku,
						PV:  pv,
					}
					aws.Pricing[key] = productTerms
					aws.Pricing[spotKey] = productTerms
					skusToKeys[product.Sku] = key
					aws.ValidPricingKeys[key] = true
					aws.ValidPricingKeys[spotKey] = true
				}
			}
		}
		if t == "terms" {
			_, err := dec.Token() // this should parse the opening "{""
			if err != nil {
				return err
			}
			termType, err := dec.Token()
			if err != nil {
				return err
			}
			if termType == "OnDemand" {
				_, err := dec.Token()
				if err != nil { // again, should parse an opening "{"
					return err
				}
				for dec.More() {
					sku, err := dec.Token()
					if err != nil {
						return err
					}
					_, err = dec.Token() // another opening "{"
					if err != nil {
						return err
					}
					skuOnDemand, err := dec.Token()
					if err != nil {
						return err
					}
					offerTerm := &AWSOfferTerm{}
					err = dec.Decode(&offerTerm)
					if err != nil {
						klog.V(1).Infof("Error decoding AWS Offer Term: " + err.Error())
					}
					if sku.(string)+OnDemandRateCode == skuOnDemand {
						key, ok := skusToKeys[sku.(string)]
						spotKey := key + ",preemptible"
						if ok {
							aws.Pricing[key].OnDemand = offerTerm
							aws.Pricing[spotKey].OnDemand = offerTerm
							if strings.Contains(key, "EBS:VolumeP-IOPS.piops") {
								// If the specific UsageType is the per IO cost used on io1 volumes
								// we need to add the per IO cost to the io1 PV cost
								cost := offerTerm.PriceDimensions[sku.(string)+OnDemandRateCode+HourlyRateCode].PricePerUnit.USD
								// Add the per IO cost to the PV object for the io1 volume type
								aws.Pricing[key].PV.CostPerIO = cost
							} else if strings.Contains(key, "EBS:Volume") {
								// If volume, we need to get hourly cost and add it to the PV object
								cost := offerTerm.PriceDimensions[sku.(string)+OnDemandRateCode+HourlyRateCode].PricePerUnit.USD
								costFloat, _ := strconv.ParseFloat(cost, 64)
								hourlyPrice := costFloat / 730

								aws.Pricing[key].PV.Cost = strconv.FormatFloat(hourlyPrice, 'f', -1, 64)
							}
						}
					}
					_, err = dec.Token()
					if err != nil {
						return err
					}
				}
				_, err = dec.Token()
				if err != nil {
					return err
				}
			}
		}
	}

	sp, err := parseSpotData(aws.SpotDataBucket, aws.SpotDataPrefix, aws.ProjectID, aws.SpotDataRegion, aws.ServiceKeyName, aws.ServiceKeySecret)
	if err != nil {
		klog.V(1).Infof("Skipping AWS spot data download: %s", err.Error())
	} else {
		aws.SpotPricingByInstanceID = sp
	}

	return nil
}

// Stubbed NetworkPricing for AWS. Pull directly from aws.json for now
func (c *AWS) NetworkPricing() (*Network, error) {
	cpricing, err := GetDefaultPricingData("aws.json")
	if err != nil {
		return nil, err
	}
	znec, err := strconv.ParseFloat(cpricing.ZoneNetworkEgress, 64)
	if err != nil {
		return nil, err
	}
	rnec, err := strconv.ParseFloat(cpricing.RegionNetworkEgress, 64)
	if err != nil {
		return nil, err
	}
	inec, err := strconv.ParseFloat(cpricing.InternetNetworkEgress, 64)
	if err != nil {
		return nil, err
	}

	return &Network{
		ZoneNetworkEgressCost:     znec,
		RegionNetworkEgressCost:   rnec,
		InternetNetworkEgressCost: inec,
	}, nil
}

// AllNodePricing returns all the billing data fetched.
func (aws *AWS) AllNodePricing() (interface{}, error) {
	aws.DownloadPricingDataLock.RLock()
	defer aws.DownloadPricingDataLock.RUnlock()
	return aws.Pricing, nil
}

func (aws *AWS) createNode(terms *AWSProductTerms, usageType string, k Key) (*Node, error) {
	key := k.Features()
	if aws.isPreemptible(key) {
		if spotInfo, ok := aws.SpotPricingByInstanceID[k.ID()]; ok { // try and match directly to an ID for pricing. We'll still need the features
			var spotcost string
			arr := strings.Split(spotInfo.Charge, " ")
			if len(arr) == 2 {
				spotcost = arr[0]
			} else {
				klog.V(2).Infof("Spot data for node %s is missing", k.ID())
			}
			return &Node{
				Cost:         spotcost,
				VCPU:         terms.VCpu,
				RAM:          terms.Memory,
				GPU:          terms.GPU,
				Storage:      terms.Storage,
				BaseCPUPrice: aws.BaseCPUPrice,
				BaseRAMPrice: aws.BaseRAMPrice,
				BaseGPUPrice: aws.BaseGPUPrice,
				UsageType:    usageType,
			}, nil
		}
		return &Node{
			VCPU:         terms.VCpu,
			VCPUCost:     aws.BaseSpotCPUPrice,
			RAM:          terms.Memory,
			GPU:          terms.GPU,
			RAMCost:      aws.BaseSpotRAMPrice,
			Storage:      terms.Storage,
			BaseCPUPrice: aws.BaseCPUPrice,
			BaseRAMPrice: aws.BaseRAMPrice,
			BaseGPUPrice: aws.BaseGPUPrice,
			UsageType:    usageType,
		}, nil
	}
	c, ok := terms.OnDemand.PriceDimensions[terms.Sku+OnDemandRateCode+HourlyRateCode]
	if !ok {
		return nil, fmt.Errorf("Could not fetch data for \"%s\"", k.ID())
	}
	cost := c.PricePerUnit.USD
	return &Node{
		Cost:         cost,
		VCPU:         terms.VCpu,
		RAM:          terms.Memory,
		GPU:          terms.GPU,
		Storage:      terms.Storage,
		BaseCPUPrice: aws.BaseCPUPrice,
		BaseRAMPrice: aws.BaseRAMPrice,
		BaseGPUPrice: aws.BaseGPUPrice,
		UsageType:    usageType,
	}, nil
}

// NodePricing takes in a key from GetKey and returns a Node object for use in building the cost model.
func (aws *AWS) NodePricing(k Key) (*Node, error) {
	aws.DownloadPricingDataLock.RLock()
	defer aws.DownloadPricingDataLock.RUnlock()

	key := k.Features()
	usageType := "ondemand"
	if aws.isPreemptible(key) {
		usageType = "preemptible"
	}

	terms, ok := aws.Pricing[key]
	if ok {
		return aws.createNode(terms, usageType, k)
	} else if _, ok := aws.ValidPricingKeys[key]; ok {
		aws.DownloadPricingDataLock.RUnlock()
		err := aws.DownloadPricingData()
		aws.DownloadPricingDataLock.RLock()
		if err != nil {
			return &Node{
				Cost:             aws.BaseCPUPrice,
				BaseCPUPrice:     aws.BaseCPUPrice,
				BaseRAMPrice:     aws.BaseRAMPrice,
				BaseGPUPrice:     aws.BaseGPUPrice,
				UsageType:        usageType,
				UsesBaseCPUPrice: true,
			}, err
		}
		terms, termsOk := aws.Pricing[key]
		if !termsOk {
			return &Node{
				Cost:             aws.BaseCPUPrice,
				BaseCPUPrice:     aws.BaseCPUPrice,
				BaseRAMPrice:     aws.BaseRAMPrice,
				BaseGPUPrice:     aws.BaseGPUPrice,
				UsageType:        usageType,
				UsesBaseCPUPrice: true,
			}, fmt.Errorf("Unable to find any Pricing data for \"%s\"", key)
		}
		return aws.createNode(terms, usageType, k)
	} else { // Fall back to base pricing if we can't find the key.
		klog.V(1).Infof("Invalid Pricing Key \"%s\"", key)
		return &Node{
			Cost:             aws.BaseCPUPrice,
			BaseCPUPrice:     aws.BaseCPUPrice,
			BaseRAMPrice:     aws.BaseRAMPrice,
			BaseGPUPrice:     aws.BaseGPUPrice,
			UsageType:        usageType,
			UsesBaseCPUPrice: true,
		}, nil
	}
}

// ClusterInfo returns an object that represents the cluster. TODO: actually return the name of the cluster. Blocked on cluster federation.
func (awsProvider *AWS) ClusterInfo() (map[string]string, error) {
	defaultClusterName := "AWS Cluster #1"
	c, err := awsProvider.GetConfig()
	if err != nil {
		return nil, err
	}

	remote := os.Getenv(remoteEnabled)
	remoteEnabled := false
	if os.Getenv(remote) == "true" {
		remoteEnabled = true
	}

	if c.ClusterName != "" {
		m := make(map[string]string)
		m["name"] = c.ClusterName
		m["provider"] = "AWS"
		m["id"] = os.Getenv(clusterIDKey)
		m["remoteReadEnabled"] = strconv.FormatBool(remoteEnabled)
		return m, nil
	}
	makeStructure := func(clusterName string) (map[string]string, error) {
		klog.V(2).Infof("Returning \"%s\" as ClusterName", clusterName)
		m := make(map[string]string)
		m["name"] = clusterName
		m["provider"] = "AWS"
		m["id"] = os.Getenv(clusterIDKey)
		m["remoteReadEnabled"] = strconv.FormatBool(remoteEnabled)
		return m, nil
	}

	maybeClusterId := os.Getenv(ClusterIdEnvVar)
	if len(maybeClusterId) != 0 {
		return makeStructure(maybeClusterId)
	}
	provIdRx := regexp.MustCompile("aws:///([^/]+)/([^/]+)")
	clusterIdRx := regexp.MustCompile("^kubernetes\\.io/cluster/([^/]+)")
	nodeList := awsProvider.Clientset.GetAllNodes()
	for _, n := range nodeList {
		region := ""
		instanceId := ""
		providerId := n.Spec.ProviderID
		for matchNum, group := range provIdRx.FindStringSubmatch(providerId) {
			if matchNum == 1 {
				region = group
			} else if matchNum == 2 {
				instanceId = group
			}
		}
		if len(instanceId) == 0 {
			klog.V(2).Infof("Unable to decode Node.ProviderID \"%s\", skipping it", providerId)
			continue
		}
		c := &aws.Config{
			Region: aws.String(region),
		}
		s := session.Must(session.NewSession(c))
		ec2Svc := ec2.New(s)
		di, diErr := ec2Svc.DescribeInstances(&ec2.DescribeInstancesInput{
			InstanceIds: []*string{
				aws.String(instanceId),
			},
		})
		if diErr != nil {
			// maybe log this?
			continue
		}
		if len(di.Reservations) != 1 {
			klog.V(2).Infof("Expected 1 Reservation back from DescribeInstances(%s), received %d", instanceId, len(di.Reservations))
			continue
		}
		res := di.Reservations[0]
		if len(res.Instances) != 1 {
			klog.V(2).Infof("Expected 1 Instance back from DescribeInstances(%s), received %d", instanceId, len(res.Instances))
			continue
		}
		inst := res.Instances[0]
		for _, tag := range inst.Tags {
			tagKey := *tag.Key
			for matchNum, group := range clusterIdRx.FindStringSubmatch(tagKey) {
				if matchNum != 1 {
					continue
				}
				return makeStructure(group)
			}
		}
	}
	klog.V(2).Infof("Unable to sniff out cluster ID, perhaps set $%s to force one", ClusterIdEnvVar)
	return makeStructure(defaultClusterName)
}

// AddServiceKey adds an AWS service key, useful for pulling down out-of-cluster costs. Optional-- the container this runs in can be directly authorized.
func (*AWS) AddServiceKey(formValues url.Values) error {
	keyID := formValues.Get("access_key_ID")
	key := formValues.Get("secret_access_key")
	m := make(map[string]string)
	m["access_key_ID"] = keyID
	m["secret_access_key"] = key
	result, err := json.Marshal(m)
	if err != nil {
		return err
	}
	return ioutil.WriteFile("/var/configs/key.json", result, 0644)
}

// GetDisks returns the AWS disks backing PVs. Useful because sometimes k8s will not clean up PVs correctly. Requires a json config in /var/configs with key region.
func (*AWS) GetDisks() ([]byte, error) {
	jsonFile, err := os.Open("/var/configs/key.json")
	if err == nil {
		byteValue, _ := ioutil.ReadAll(jsonFile)
		var result map[string]string
		err := json.Unmarshal([]byte(byteValue), &result)
		if err != nil {
			return nil, err
		}
		err = os.Setenv(awsAccessKeyIDEnvVar, result["access_key_ID"])
		if err != nil {
			return nil, err
		}
		err = os.Setenv(awsAccessKeySecretEnvVar, result["secret_access_key"])
		if err != nil {
			return nil, err
		}
	} else if os.IsNotExist(err) {
		klog.V(2).Infof("Using Default Credentials")
	} else {
		return nil, err
	}
	defer jsonFile.Close()
	clusterConfig, err := os.Open("/var/configs/cluster.json")
	if err != nil {
		return nil, err
	}
	defer clusterConfig.Close()
	b, err := ioutil.ReadAll(clusterConfig)
	if err != nil {
		return nil, err
	}
	var clusterConf map[string]string
	err = json.Unmarshal([]byte(b), &clusterConf)
	if err != nil {
		return nil, err
	}
	region := aws.String(clusterConf["region"])
	c := &aws.Config{
		Region: region,
	}
	s := session.Must(session.NewSession(c))

	ec2Svc := ec2.New(s)
	input := &ec2.DescribeVolumesInput{}
	volumeResult, err := ec2Svc.DescribeVolumes(input)
	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			default:
				return nil, aerr
			}
		} else {
			return nil, err
		}
	}
	return json.Marshal(volumeResult)
}

// ConvertToGlueColumnFormat takes a string and runs through various regex
// and string replacement statements to convert it to a format compatible
// with AWS Glue and Athena column names.
// Following guidance from AWS provided here ('Column Names' section):
// https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/run-athena-sql.html
// It returns a string containing the column name in proper column name format and length.
func ConvertToGlueColumnFormat(column_name string) string {
	klog.V(5).Infof("Converting string \"%s\" to proper AWS Glue column name.", column_name)

	// An underscore is added in front of uppercase letters
	capital_underscore := regexp.MustCompile(`[A-Z]`)
	final := capital_underscore.ReplaceAllString(column_name, `_$0`)

	// Any non-alphanumeric characters are replaced with an underscore
	no_space_punc := regexp.MustCompile(`[\s]{1,}|[^A-Za-z0-9]`)
	final = no_space_punc.ReplaceAllString(final, "_")

	// Duplicate underscores are removed
	no_dup_underscore := regexp.MustCompile(`_{2,}`)
	final = no_dup_underscore.ReplaceAllString(final, "_")

	// Any leading and trailing underscores are removed
	no_front_end_underscore := regexp.MustCompile(`(^\_|\_$)`)
	final = no_front_end_underscore.ReplaceAllString(final, "")

	// Uppercase to lowercase
	final = strings.ToLower(final)

	// Longer column name than expected - remove _ left to right
	allowed_col_len := 128
	undersc_to_remove := len(final) - allowed_col_len
	if undersc_to_remove > 0 {
		final = strings.Replace(final, "_", "", undersc_to_remove)
	}

	// If removing all of the underscores still didn't
	// make the column name < 128 characters, trim it!
	if len(final) > allowed_col_len {
		final = final[:allowed_col_len]
	}

	klog.V(5).Infof("Column name being returned: \"%s\". Length: \"%d\".", final, len(final))

	return final
}

// ExternalAllocations represents tagged assets outside the scope of kubernetes.
// "start" and "end" are dates of the format YYYY-MM-DD
// "aggregator" is the tag used to determine how to allocate those assets, ie namespace, pod, etc.
func (a *AWS) ExternalAllocations(start string, end string, aggregator string) ([]*OutOfClusterAllocation, error) {
	customPricing, err := a.GetConfig()
	if err != nil {
		return nil, err
	}
	aggregator_column_name := "resource_tags_user_" + aggregator
	aggregator_column_name = ConvertToGlueColumnFormat(aggregator_column_name)
	query := fmt.Sprintf(`SELECT   
		CAST(line_item_usage_start_date AS DATE) as start_date,
		%s,
		line_item_product_code,
		SUM(line_item_blended_cost) as blended_cost
	FROM %s as cost_data
	WHERE line_item_usage_start_date BETWEEN date '%s' AND date '%s'
	GROUP BY 1,2,3`, aggregator_column_name, customPricing.AthenaTable, start, end)

	if customPricing.ServiceKeyName != "" {
		err = os.Setenv(awsAccessKeyIDEnvVar, customPricing.ServiceKeyName)
		if err != nil {
			return nil, err
		}
		err = os.Setenv(awsAccessKeySecretEnvVar, customPricing.ServiceKeySecret)
		if err != nil {
			return nil, err
		}
	}
	region := aws.String(customPricing.AthenaRegion)
	resultsBucket := customPricing.AthenaBucketName
	database := customPricing.AthenaDatabase

	c := &aws.Config{
		Region: region,
	}
	s := session.Must(session.NewSession(c))
	svc := athena.New(s)

	var e athena.StartQueryExecutionInput

	var r athena.ResultConfiguration
	r.SetOutputLocation(resultsBucket)
	e.SetResultConfiguration(&r)

	e.SetQueryString(query)
	var q athena.QueryExecutionContext
	q.SetDatabase(database)
	e.SetQueryExecutionContext(&q)

	res, err := svc.StartQueryExecution(&e)
	if err != nil {
		return nil, err
	}

	klog.V(2).Infof("StartQueryExecution result:")
	klog.V(2).Infof(res.GoString())

	var qri athena.GetQueryExecutionInput
	qri.SetQueryExecutionId(*res.QueryExecutionId)

	var qrop *athena.GetQueryExecutionOutput
	duration := time.Duration(2) * time.Second // Pause for 2 seconds

	for {
		qrop, err = svc.GetQueryExecution(&qri)
		if err != nil {
			return nil, err
		}
		if *qrop.QueryExecution.Status.State != "RUNNING" {
			break
		}
		time.Sleep(duration)
	}
	var oocAllocs []*OutOfClusterAllocation
	if *qrop.QueryExecution.Status.State == "SUCCEEDED" {

		var ip athena.GetQueryResultsInput
		ip.SetQueryExecutionId(*res.QueryExecutionId)

		op, err := svc.GetQueryResults(&ip)
		if err != nil {
			return nil, err
		}
		if len(op.ResultSet.Rows) > 1 {
			for _, r := range op.ResultSet.Rows[1:(len(op.ResultSet.Rows) - 1)] {

				cost, err := strconv.ParseFloat(*r.Data[3].VarCharValue, 64)
				if err != nil {
					return nil, err
				}
				ooc := &OutOfClusterAllocation{
					Aggregator:  aggregator,
					Environment: *r.Data[1].VarCharValue,
					Service:     *r.Data[2].VarCharValue,
					Cost:        cost,
				}
				oocAllocs = append(oocAllocs, ooc)
			}
		} else {
			klog.V(1).Infof("No results available for %s at database %s between %s and %s", aggregator_column_name, customPricing.AthenaTable, start, end)
		}
	}

	return oocAllocs, nil // TODO: transform the QuerySQL lines into the new OutOfClusterAllocation Struct
}

// QuerySQL can query a properly configured Athena database.
// Used to fetch billing data.
// Requires a json config in /var/configs with key region, output, and database.
func (a *AWS) QuerySQL(query string) ([]byte, error) {
	customPricing, err := a.GetConfig()
	if err != nil {
		return nil, err
	}
	if customPricing.ServiceKeyName != "" {
		err = os.Setenv(awsAccessKeyIDEnvVar, customPricing.ServiceKeyName)
		if err != nil {
			return nil, err
		}
		err = os.Setenv(awsAccessKeySecretEnvVar, customPricing.ServiceKeySecret)
		if err != nil {
			return nil, err
		}
	}
	athenaConfigs, err := os.Open("/var/configs/athena.json")
	if err != nil {
		return nil, err
	}
	defer athenaConfigs.Close()
	b, err := ioutil.ReadAll(athenaConfigs)
	if err != nil {
		return nil, err
	}
	var athenaConf map[string]string
	json.Unmarshal([]byte(b), &athenaConf)
	region := aws.String(customPricing.AthenaRegion)
	resultsBucket := customPricing.AthenaBucketName
	database := customPricing.AthenaDatabase

	c := &aws.Config{
		Region: region,
	}
	s := session.Must(session.NewSession(c))
	svc := athena.New(s)

	var e athena.StartQueryExecutionInput

	var r athena.ResultConfiguration
	r.SetOutputLocation(resultsBucket)
	e.SetResultConfiguration(&r)

	e.SetQueryString(query)
	var q athena.QueryExecutionContext
	q.SetDatabase(database)
	e.SetQueryExecutionContext(&q)

	res, err := svc.StartQueryExecution(&e)
	if err != nil {
		return nil, err
	}

	klog.V(2).Infof("StartQueryExecution result:")
	klog.V(2).Infof(res.GoString())

	var qri athena.GetQueryExecutionInput
	qri.SetQueryExecutionId(*res.QueryExecutionId)

	var qrop *athena.GetQueryExecutionOutput
	duration := time.Duration(2) * time.Second // Pause for 2 seconds

	for {
		qrop, err = svc.GetQueryExecution(&qri)
		if err != nil {
			return nil, err
		}
		if *qrop.QueryExecution.Status.State != "RUNNING" {
			break
		}
		time.Sleep(duration)
	}
	if *qrop.QueryExecution.Status.State == "SUCCEEDED" {

		var ip athena.GetQueryResultsInput
		ip.SetQueryExecutionId(*res.QueryExecutionId)

		op, err := svc.GetQueryResults(&ip)
		if err != nil {
			return nil, err
		}
		b, err := json.Marshal(op.ResultSet)
		if err != nil {
			return nil, err
		}

		return b, nil
	}
	return nil, fmt.Errorf("Error getting query results : %s", *qrop.QueryExecution.Status.State)
}

type spotInfo struct {
	Timestamp   string `csv:"Timestamp"`
	UsageType   string `csv:"UsageType"`
	Operation   string `csv:"Operation"`
	InstanceID  string `csv:"InstanceID"`
	MyBidID     string `csv:"MyBidID"`
	MyMaxPrice  string `csv:"MyMaxPrice"`
	MarketPrice string `csv:"MarketPrice"`
	Charge      string `csv:"Charge"`
	Version     string `csv:"Version"`
}

type fnames []*string

func (f fnames) Len() int {
	return len(f)
}

func (f fnames) Swap(i, j int) {
	f[i], f[j] = f[j], f[i]
}

func (f fnames) Less(i, j int) bool {
	key1 := strings.Split(*f[i], ".")
	key2 := strings.Split(*f[j], ".")

	t1, err := time.Parse("2006-01-02-15", key1[1])
	if err != nil {
		klog.V(1).Info("Unable to parse timestamp" + key1[1])
		return false
	}
	t2, err := time.Parse("2006-01-02-15", key2[1])
	if err != nil {
		klog.V(1).Info("Unable to parse timestamp" + key2[1])
		return false
	}
	return t1.Before(t2)
}

func parseSpotData(bucket string, prefix string, projectID string, region string, accessKeyID string, accessKeySecret string) (map[string]*spotInfo, error) {

	if accessKeyID != "" && accessKeySecret != "" { // credentials may exist on the actual AWS node-- if so, use those. If not, override with the service key
		err := os.Setenv(awsAccessKeyIDEnvVar, accessKeyID)
		if err != nil {
			return nil, err
		}
		err = os.Setenv(awsAccessKeySecretEnvVar, accessKeySecret)
		if err != nil {
			return nil, err
		}
	}
	s3Prefix := projectID
	if len(prefix) != 0 {
		s3Prefix = prefix + "/" + s3Prefix
	}

	c := aws.NewConfig().WithRegion(region)

	s := session.Must(session.NewSession(c))
	s3Svc := s3.New(s)
	downloader := s3manager.NewDownloaderWithClient(s3Svc)

	tNow := time.Now()
	tOneDayAgo := tNow.Add(time.Duration(-24) * time.Hour) // Also get files from one day ago to avoid boundary conditions
	ls := &s3.ListObjectsInput{
		Bucket: aws.String(bucket),
		Prefix: aws.String(s3Prefix + "." + tOneDayAgo.Format("2006-01-02")),
	}
	ls2 := &s3.ListObjectsInput{
		Bucket: aws.String(bucket),
		Prefix: aws.String(s3Prefix + "." + tNow.Format("2006-01-02")),
	}
	lso, err := s3Svc.ListObjects(ls)
	if err != nil {
		return nil, err
	}
	lsoLen := len(lso.Contents)
	klog.V(2).Infof("Found %d spot data files from yesterday", lsoLen)
	if lsoLen == 0 {
		klog.V(5).Infof("ListObjects \"s3://%s/%s\" produced no keys", *ls.Bucket, *ls.Prefix)
	}
	lso2, err := s3Svc.ListObjects(ls2)
	if err != nil {
		return nil, err
	}
	lso2Len := len(lso2.Contents)
	klog.V(2).Infof("Found %d spot data files from today", lso2Len)
	if lso2Len == 0 {
		klog.V(5).Infof("ListObjects \"s3://%s/%s\" produced no keys", *ls2.Bucket, *ls2.Prefix)
	}

	var keys []*string
	for _, obj := range lso.Contents {
		keys = append(keys, obj.Key)
	}
	for _, obj := range lso2.Contents {
		keys = append(keys, obj.Key)
	}

	versionRx := regexp.MustCompile("^#Version: (\\d+)\\.\\d+$")
	header, err := csvutil.Header(spotInfo{}, "csv")
	if err != nil {
		return nil, err
	}
	fieldsPerRecord := len(header)

	spots := make(map[string]*spotInfo)
	for _, key := range keys {
		getObj := &s3.GetObjectInput{
			Bucket: aws.String(bucket),
			Key:    key,
		}

		buf := aws.NewWriteAtBuffer([]byte{})
		_, err := downloader.Download(buf, getObj)
		if err != nil {
			return nil, err
		}

		r := bytes.NewReader(buf.Bytes())

		gr, err := gzip.NewReader(r)
		if err != nil {
			return nil, err
		}

		csvReader := csv.NewReader(gr)
		csvReader.Comma = '\t'
		csvReader.FieldsPerRecord = fieldsPerRecord

		dec, err := csvutil.NewDecoder(csvReader, header...)
		if err != nil {
			return nil, err
		}

		var foundVersion string
		for {
			spot := spotInfo{}
			err := dec.Decode(&spot)
			csvParseErr, isCsvParseErr := err.(*csv.ParseError)
			if err == io.EOF {
				break
			} else if err == csvutil.ErrFieldCount || (isCsvParseErr && csvParseErr.Err == csv.ErrFieldCount) {
				rec := dec.Record()
				// the first two "Record()" will be the comment lines
				// and they show up as len() == 1
				// the first of which is "#Version"
				// the second of which is "#Fields: "
				if len(rec) != 1 {
					klog.V(2).Infof("Expected %d spot info fields but received %d: %s", fieldsPerRecord, len(rec), rec)
					continue
				}
				if len(foundVersion) == 0 {
					spotFeedVersion := rec[0]
					klog.V(4).Infof("Spot feed version is \"%s\"", spotFeedVersion)
					matches := versionRx.FindStringSubmatch(spotFeedVersion)
					if matches != nil {
						foundVersion = matches[1]
						if foundVersion != supportedSpotFeedVersion {
							klog.V(2).Infof("Unsupported spot info feed version: wanted \"%s\" got \"%s\"", supportedSpotFeedVersion, foundVersion)
							break
						}
					}
					continue
				} else if strings.Index(rec[0], "#") == 0 {
					continue
				} else {
					klog.V(3).Infof("skipping non-TSV line: %s", rec)
					continue
				}
			} else if err != nil {
				klog.V(2).Infof("Error during spot info decode: %+v", err)
				continue
			}

			klog.V(4).Infof("Found spot info %+v", spot)
			spots[spot.InstanceID] = &spot
		}
		gr.Close()
	}
	return spots, nil
}

func (aws *AWS) ApplyReservedInstancePricing(nodes map[string]*Node) {

}

/*
func (aws *AWS) getReservedInstances() ([]interface{}, error) {
	customPricing, err := a.GetConfig()
	if err != nil {
		return nil, err
	}
	if customPricing.ServiceKeyName != "" {
		err = os.Setenv(awsAccessKeyIDEnvVar, customPricing.ServiceKeyName)
		if err != nil {
			return nil, err
		}
		err = os.Setenv(awsAccessKeySecretEnvVar, customPricing.ServiceKeySecret)
		if err != nil {
			return nil, err
		}
	}
	athenaConfigs, err := os.Open("/var/configs/athena.json")
	if err != nil {
		return nil, err
	}
	defer athenaConfigs.Close()
	b, err := ioutil.ReadAll(athenaConfigs)
	if err != nil {
		return nil, err
	}
	var athenaConf map[string]string
	json.Unmarshal([]byte(b), &athenaConf)
	region := aws.String(customPricing.AthenaRegion)

	c := &aws.Config{
		Region: region,
	}
	s := session.Must(session.NewSession(c))
	svc := ec2.New(s)

	svc.DescribeReservedInstances()
}
*/