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vendor update for E2E framework

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Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
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Madhu Rajanna
2019-05-31 15:15:11 +05:30
parent 9bb23e4e32
commit d300da19b7
2149 changed files with 598692 additions and 14107 deletions
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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cloudprovider
import (
"context"
"errors"
"fmt"
"strings"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/informers"
clientset "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
)
// ControllerClientBuilder allows you to get clients and configs for controllers
// Please note a copy also exists in pkg/controller/client_builder.go
// TODO: Make this depend on the separate controller utilities repo (issues/68947)
type ControllerClientBuilder interface {
Config(name string) (*restclient.Config, error)
ConfigOrDie(name string) *restclient.Config
Client(name string) (clientset.Interface, error)
ClientOrDie(name string) clientset.Interface
}
// Interface is an abstract, pluggable interface for cloud providers.
type Interface interface {
// Initialize provides the cloud with a kubernetes client builder and may spawn goroutines
// to perform housekeeping or run custom controllers specific to the cloud provider.
// Any tasks started here should be cleaned up when the stop channel closes.
Initialize(clientBuilder ControllerClientBuilder, stop <-chan struct{})
// LoadBalancer returns a balancer interface. Also returns true if the interface is supported, false otherwise.
LoadBalancer() (LoadBalancer, bool)
// Instances returns an instances interface. Also returns true if the interface is supported, false otherwise.
Instances() (Instances, bool)
// Zones returns a zones interface. Also returns true if the interface is supported, false otherwise.
Zones() (Zones, bool)
// Clusters returns a clusters interface. Also returns true if the interface is supported, false otherwise.
Clusters() (Clusters, bool)
// Routes returns a routes interface along with whether the interface is supported.
Routes() (Routes, bool)
// ProviderName returns the cloud provider ID.
ProviderName() string
// HasClusterID returns true if a ClusterID is required and set
HasClusterID() bool
}
type InformerUser interface {
// SetInformers sets the informer on the cloud object.
SetInformers(informerFactory informers.SharedInformerFactory)
}
// Clusters is an abstract, pluggable interface for clusters of containers.
type Clusters interface {
// ListClusters lists the names of the available clusters.
ListClusters(ctx context.Context) ([]string, error)
// Master gets back the address (either DNS name or IP address) of the master node for the cluster.
Master(ctx context.Context, clusterName string) (string, error)
}
// (DEPRECATED) DefaultLoadBalancerName is the default load balancer name that is called from
// LoadBalancer.GetLoadBalancerName. Use this method to maintain backward compatible names for
// LoadBalancers that were created prior to Kubernetes v1.12. In the future, each provider should
// replace this method call in GetLoadBalancerName with a provider-specific implementation that
// is less cryptic than the Service's UUID.
func DefaultLoadBalancerName(service *v1.Service) string {
//GCE requires that the name of a load balancer starts with a lower case letter.
ret := "a" + string(service.UID)
ret = strings.Replace(ret, "-", "", -1)
//AWS requires that the name of a load balancer is shorter than 32 bytes.
if len(ret) > 32 {
ret = ret[:32]
}
return ret
}
// GetInstanceProviderID builds a ProviderID for a node in a cloud.
func GetInstanceProviderID(ctx context.Context, cloud Interface, nodeName types.NodeName) (string, error) {
instances, ok := cloud.Instances()
if !ok {
return "", fmt.Errorf("failed to get instances from cloud provider")
}
instanceID, err := instances.InstanceID(ctx, nodeName)
if err != nil {
return "", fmt.Errorf("failed to get instance ID from cloud provider: %v", err)
}
return cloud.ProviderName() + "://" + instanceID, nil
}
// LoadBalancer is an abstract, pluggable interface for load balancers.
type LoadBalancer interface {
// TODO: Break this up into different interfaces (LB, etc) when we have more than one type of service
// GetLoadBalancer returns whether the specified load balancer exists, and
// if so, what its status is.
// Implementations must treat the *v1.Service parameter as read-only and not modify it.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
GetLoadBalancer(ctx context.Context, clusterName string, service *v1.Service) (status *v1.LoadBalancerStatus, exists bool, err error)
// GetLoadBalancerName returns the name of the load balancer. Implementations must treat the
// *v1.Service parameter as read-only and not modify it.
GetLoadBalancerName(ctx context.Context, clusterName string, service *v1.Service) string
// EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
// Implementations must treat the *v1.Service and *v1.Node
// parameters as read-only and not modify them.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
EnsureLoadBalancer(ctx context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error)
// UpdateLoadBalancer updates hosts under the specified load balancer.
// Implementations must treat the *v1.Service and *v1.Node
// parameters as read-only and not modify them.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
UpdateLoadBalancer(ctx context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) error
// EnsureLoadBalancerDeleted deletes the specified load balancer if it
// exists, returning nil if the load balancer specified either didn't exist or
// was successfully deleted.
// This construction is useful because many cloud providers' load balancers
// have multiple underlying components, meaning a Get could say that the LB
// doesn't exist even if some part of it is still laying around.
// Implementations must treat the *v1.Service parameter as read-only and not modify it.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
EnsureLoadBalancerDeleted(ctx context.Context, clusterName string, service *v1.Service) error
}
// Instances is an abstract, pluggable interface for sets of instances.
type Instances interface {
// NodeAddresses returns the addresses of the specified instance.
// TODO(roberthbailey): This currently is only used in such a way that it
// returns the address of the calling instance. We should do a rename to
// make this clearer.
NodeAddresses(ctx context.Context, name types.NodeName) ([]v1.NodeAddress, error)
// NodeAddressesByProviderID returns the addresses of the specified instance.
// The instance is specified using the providerID of the node. The
// ProviderID is a unique identifier of the node. This will not be called
// from the node whose nodeaddresses are being queried. i.e. local metadata
// services cannot be used in this method to obtain nodeaddresses
NodeAddressesByProviderID(ctx context.Context, providerID string) ([]v1.NodeAddress, error)
// InstanceID returns the cloud provider ID of the node with the specified NodeName.
// Note that if the instance does not exist, we must return ("", cloudprovider.InstanceNotFound)
// cloudprovider.InstanceNotFound should NOT be returned for instances that exist but are stopped/sleeping
InstanceID(ctx context.Context, nodeName types.NodeName) (string, error)
// InstanceType returns the type of the specified instance.
InstanceType(ctx context.Context, name types.NodeName) (string, error)
// InstanceTypeByProviderID returns the type of the specified instance.
InstanceTypeByProviderID(ctx context.Context, providerID string) (string, error)
// AddSSHKeyToAllInstances adds an SSH public key as a legal identity for all instances
// expected format for the key is standard ssh-keygen format: <protocol> <blob>
AddSSHKeyToAllInstances(ctx context.Context, user string, keyData []byte) error
// CurrentNodeName returns the name of the node we are currently running on
// On most clouds (e.g. GCE) this is the hostname, so we provide the hostname
CurrentNodeName(ctx context.Context, hostname string) (types.NodeName, error)
// InstanceExistsByProviderID returns true if the instance for the given provider exists.
// If false is returned with no error, the instance will be immediately deleted by the cloud controller manager.
// This method should still return true for instances that exist but are stopped/sleeping.
InstanceExistsByProviderID(ctx context.Context, providerID string) (bool, error)
// InstanceShutdownByProviderID returns true if the instance is shutdown in cloudprovider
InstanceShutdownByProviderID(ctx context.Context, providerID string) (bool, error)
}
// Route is a representation of an advanced routing rule.
type Route struct {
// Name is the name of the routing rule in the cloud-provider.
// It will be ignored in a Create (although nameHint may influence it)
Name string
// TargetNode is the NodeName of the target instance.
TargetNode types.NodeName
// DestinationCIDR is the CIDR format IP range that this routing rule
// applies to.
DestinationCIDR string
// Blackhole is set to true if this is a blackhole route
// The node controller will delete the route if it is in the managed range.
Blackhole bool
}
// Routes is an abstract, pluggable interface for advanced routing rules.
type Routes interface {
// ListRoutes lists all managed routes that belong to the specified clusterName
ListRoutes(ctx context.Context, clusterName string) ([]*Route, error)
// CreateRoute creates the described managed route
// route.Name will be ignored, although the cloud-provider may use nameHint
// to create a more user-meaningful name.
CreateRoute(ctx context.Context, clusterName string, nameHint string, route *Route) error
// DeleteRoute deletes the specified managed route
// Route should be as returned by ListRoutes
DeleteRoute(ctx context.Context, clusterName string, route *Route) error
}
var (
InstanceNotFound = errors.New("instance not found")
DiskNotFound = errors.New("disk is not found")
NotImplemented = errors.New("unimplemented")
)
// Zone represents the location of a particular machine.
type Zone struct {
FailureDomain string
Region string
}
// Zones is an abstract, pluggable interface for zone enumeration.
type Zones interface {
// GetZone returns the Zone containing the current failure zone and locality region that the program is running in
// In most cases, this method is called from the kubelet querying a local metadata service to acquire its zone.
// For the case of external cloud providers, use GetZoneByProviderID or GetZoneByNodeName since GetZone
// can no longer be called from the kubelets.
GetZone(ctx context.Context) (Zone, error)
// GetZoneByProviderID returns the Zone containing the current zone and locality region of the node specified by providerID
// This method is particularly used in the context of external cloud providers where node initialization must be done
// outside the kubelets.
GetZoneByProviderID(ctx context.Context, providerID string) (Zone, error)
// GetZoneByNodeName returns the Zone containing the current zone and locality region of the node specified by node name
// This method is particularly used in the context of external cloud providers where node initialization must be done
// outside the kubelets.
GetZoneByNodeName(ctx context.Context, nodeName types.NodeName) (Zone, error)
}
// PVLabeler is an abstract, pluggable interface for fetching labels for volumes
type PVLabeler interface {
GetLabelsForVolume(ctx context.Context, pv *v1.PersistentVolume) (map[string]string, error)
}

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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package cloudprovider supplies interfaces and implementations for cloud service providers.
package cloudprovider // import "k8s.io/cloud-provider"

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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package features
import (
utilfeature "k8s.io/apiserver/pkg/util/feature"
)
// TODO: this file should ideally live in k8s.io/cloud-provider-gcp, but it is
// temporarily placed here to remove dependencies to k8s.io/kubernetes in the
// in-tree GCE cloud provider. Move this to k8s.io/cloud-provider-gcp as soon
// as it's ready to be used
const (
// owner: @verult
// GA: v1.13
//
// Enables the regional PD feature on GCE.
GCERegionalPersistentDisk utilfeature.Feature = "GCERegionalPersistentDisk"
)

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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cloudprovider
import (
"fmt"
"io"
"os"
"sync"
"k8s.io/klog"
)
// Factory is a function that returns a cloudprovider.Interface.
// The config parameter provides an io.Reader handler to the factory in
// order to load specific configurations. If no configuration is provided
// the parameter is nil.
type Factory func(config io.Reader) (Interface, error)
// All registered cloud providers.
var (
providersMutex sync.Mutex
providers = make(map[string]Factory)
deprecatedCloudProviders = []struct {
name string
external bool
detail string
}{
{"aws", false, "The AWS provider is deprecated and will be removed in a future release"},
{"azure", false, "The Azure provider is deprecated and will be removed in a future release"},
{"cloudstack", false, "The CloudStack Controller project is no longer maintained."},
{"gce", false, "The GCE provider is deprecated and will be removed in a future release"},
{"openstack", true, "https://github.com/kubernetes/cloud-provider-openstack"},
{"ovirt", false, "The ovirt Controller project is no longer maintained."},
{"photon", false, "The Photon Controller project is no longer maintained."},
{"vsphere", false, "The vSphere provider is deprecated and will be removed in a future release"},
}
)
const externalCloudProvider = "external"
// RegisterCloudProvider registers a cloudprovider.Factory by name. This
// is expected to happen during app startup.
func RegisterCloudProvider(name string, cloud Factory) {
providersMutex.Lock()
defer providersMutex.Unlock()
if _, found := providers[name]; found {
klog.Fatalf("Cloud provider %q was registered twice", name)
}
klog.V(1).Infof("Registered cloud provider %q", name)
providers[name] = cloud
}
// IsCloudProvider returns true if name corresponds to an already registered
// cloud provider.
func IsCloudProvider(name string) bool {
providersMutex.Lock()
defer providersMutex.Unlock()
_, found := providers[name]
return found
}
// GetCloudProvider creates an instance of the named cloud provider, or nil if
// the name is unknown. The error return is only used if the named provider
// was known but failed to initialize. The config parameter specifies the
// io.Reader handler of the configuration file for the cloud provider, or nil
// for no configuration.
func GetCloudProvider(name string, config io.Reader) (Interface, error) {
providersMutex.Lock()
defer providersMutex.Unlock()
f, found := providers[name]
if !found {
return nil, nil
}
return f(config)
}
// Detects if the string is an external cloud provider
func IsExternal(name string) bool {
return name == externalCloudProvider
}
// InitCloudProvider creates an instance of the named cloud provider.
func InitCloudProvider(name string, configFilePath string) (Interface, error) {
var cloud Interface
var err error
if name == "" {
klog.Info("No cloud provider specified.")
return nil, nil
}
if IsExternal(name) {
klog.Info("External cloud provider specified")
return nil, nil
}
for _, provider := range deprecatedCloudProviders {
if provider.name == name {
detail := provider.detail
if provider.external {
detail = fmt.Sprintf("Please use 'external' cloud provider for %s: %s", name, provider.detail)
}
klog.Warningf("WARNING: %s built-in cloud provider is now deprecated. %s", name, detail)
break
}
}
if configFilePath != "" {
var config *os.File
config, err = os.Open(configFilePath)
if err != nil {
klog.Fatalf("Couldn't open cloud provider configuration %s: %#v",
configFilePath, err)
}
defer config.Close()
cloud, err = GetCloudProvider(name, config)
} else {
// Pass explicit nil so plugins can actually check for nil. See
// "Why is my nil error value not equal to nil?" in golang.org/doc/faq.
cloud, err = GetCloudProvider(name, nil)
}
if err != nil {
return nil, fmt.Errorf("could not init cloud provider %q: %v", name, err)
}
if cloud == nil {
return nil, fmt.Errorf("unknown cloud provider %q", name)
}
return cloud, nil
}

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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package volume
const (
// ProvisionedVolumeName is the name of a volume in an external cloud
// that is being provisioned and thus should be ignored by rest of Kubernetes.
ProvisionedVolumeName = "placeholder-for-provisioning"
// LabelMultiZoneDelimiter separates zones for volumes
LabelMultiZoneDelimiter = "__"
)

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vendor/k8s.io/cloud-provider/volume/errors/errors.go generated vendored Normal file
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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package errors
import (
k8stypes "k8s.io/apimachinery/pkg/types"
)
// NewDeletedVolumeInUseError returns a new instance of DeletedVolumeInUseError
// error.
func NewDeletedVolumeInUseError(message string) error {
return deletedVolumeInUseError(message)
}
type deletedVolumeInUseError string
var _ error = deletedVolumeInUseError("")
// IsDeletedVolumeInUse returns true if an error returned from Delete() is
// deletedVolumeInUseError
func IsDeletedVolumeInUse(err error) bool {
switch err.(type) {
case deletedVolumeInUseError:
return true
default:
return false
}
}
func (err deletedVolumeInUseError) Error() string {
return string(err)
}
// DanglingAttachError indicates volume is attached to a different node
// than we expected.
type DanglingAttachError struct {
msg string
CurrentNode k8stypes.NodeName
DevicePath string
}
func (err *DanglingAttachError) Error() string {
return err.msg
}
// NewDanglingError create a new dangling error
func NewDanglingError(msg string, node k8stypes.NodeName, devicePath string) error {
return &DanglingAttachError{
msg: msg,
CurrentNode: node,
DevicePath: devicePath,
}
}

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vendor/k8s.io/cloud-provider/volume/helpers/rounding.go generated vendored Normal file
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package helpers
import (
"fmt"
"k8s.io/apimachinery/pkg/api/resource"
)
const (
// GB - GigaByte size
GB = 1000 * 1000 * 1000
// GiB - GibiByte size
GiB = 1024 * 1024 * 1024
// MB - MegaByte size
MB = 1000 * 1000
// MiB - MebiByte size
MiB = 1024 * 1024
// KB - KiloByte size
KB = 1000
// KiB - KibiByte size
KiB = 1024
)
// RoundUpToGB rounds up given quantity to chunks of GB
func RoundUpToGB(size resource.Quantity) int64 {
requestBytes := size.Value()
return roundUpSize(requestBytes, GB)
}
// RoundUpToGiB rounds up given quantity upto chunks of GiB
func RoundUpToGiB(size resource.Quantity) int64 {
requestBytes := size.Value()
return roundUpSize(requestBytes, GiB)
}
// RoundUpToMB rounds up given quantity to chunks of MB
func RoundUpToMB(size resource.Quantity) int64 {
requestBytes := size.Value()
return roundUpSize(requestBytes, MB)
}
// RoundUpToMiB rounds up given quantity upto chunks of MiB
func RoundUpToMiB(size resource.Quantity) int64 {
requestBytes := size.Value()
return roundUpSize(requestBytes, MiB)
}
// RoundUpToKB rounds up given quantity to chunks of KB
func RoundUpToKB(size resource.Quantity) int64 {
requestBytes := size.Value()
return roundUpSize(requestBytes, KB)
}
// RoundUpToKiB rounds up given quantity upto chunks of KiB
func RoundUpToKiB(size resource.Quantity) int64 {
requestBytes := size.Value()
return roundUpSize(requestBytes, KiB)
}
// RoundUpToGBInt rounds up given quantity to chunks of GB. It returns an
// int instead of an int64 and an error if there's overflow
func RoundUpToGBInt(size resource.Quantity) (int, error) {
requestBytes := size.Value()
return roundUpSizeInt(requestBytes, GB)
}
// RoundUpToGiBInt rounds up given quantity upto chunks of GiB. It returns an
// int instead of an int64 and an error if there's overflow
func RoundUpToGiBInt(size resource.Quantity) (int, error) {
requestBytes := size.Value()
return roundUpSizeInt(requestBytes, GiB)
}
// RoundUpToMBInt rounds up given quantity to chunks of MB. It returns an
// int instead of an int64 and an error if there's overflow
func RoundUpToMBInt(size resource.Quantity) (int, error) {
requestBytes := size.Value()
return roundUpSizeInt(requestBytes, MB)
}
// RoundUpToMiBInt rounds up given quantity upto chunks of MiB. It returns an
// int instead of an int64 and an error if there's overflow
func RoundUpToMiBInt(size resource.Quantity) (int, error) {
requestBytes := size.Value()
return roundUpSizeInt(requestBytes, MiB)
}
// RoundUpToKBInt rounds up given quantity to chunks of KB. It returns an
// int instead of an int64 and an error if there's overflow
func RoundUpToKBInt(size resource.Quantity) (int, error) {
requestBytes := size.Value()
return roundUpSizeInt(requestBytes, KB)
}
// RoundUpToKiBInt rounds up given quantity upto chunks of KiB. It returns an
// int instead of an int64 and an error if there's overflow
func RoundUpToKiBInt(size resource.Quantity) (int, error) {
requestBytes := size.Value()
return roundUpSizeInt(requestBytes, KiB)
}
// roundUpSizeInt calculates how many allocation units are needed to accommodate
// a volume of given size. It returns an int instead of an int64 and an error if
// there's overflow
func roundUpSizeInt(volumeSizeBytes int64, allocationUnitBytes int64) (int, error) {
roundedUp := roundUpSize(volumeSizeBytes, allocationUnitBytes)
roundedUpInt := int(roundedUp)
if int64(roundedUpInt) != roundedUp {
return 0, fmt.Errorf("capacity %v is too great, casting results in integer overflow", roundedUp)
}
return roundedUpInt, nil
}
// roundUpSize calculates how many allocation units are needed to accommodate
// a volume of given size. E.g. when user wants 1500MiB volume, while AWS EBS
// allocates volumes in gibibyte-sized chunks,
// RoundUpSize(1500 * 1024*1024, 1024*1024*1024) returns '2'
// (2 GiB is the smallest allocatable volume that can hold 1500MiB)
func roundUpSize(volumeSizeBytes int64, allocationUnitBytes int64) int64 {
roundedUp := volumeSizeBytes / allocationUnitBytes
if volumeSizeBytes%allocationUnitBytes > 0 {
roundedUp++
}
return roundedUp
}

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vendor/k8s.io/cloud-provider/volume/helpers/zones.go generated vendored Normal file
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package helpers
import (
"fmt"
"hash/fnv"
"math/rand"
"strconv"
"strings"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/sets"
cloudvolume "k8s.io/cloud-provider/volume"
"k8s.io/klog"
)
// LabelZonesToSet converts a PV label value from string containing a delimited list of zones to set
func LabelZonesToSet(labelZonesValue string) (sets.String, error) {
return stringToSet(labelZonesValue, cloudvolume.LabelMultiZoneDelimiter)
}
// ZonesSetToLabelValue converts zones set to label value
func ZonesSetToLabelValue(strSet sets.String) string {
return strings.Join(strSet.UnsortedList(), cloudvolume.LabelMultiZoneDelimiter)
}
// ZonesToSet converts a string containing a comma separated list of zones to set
func ZonesToSet(zonesString string) (sets.String, error) {
zones, err := stringToSet(zonesString, ",")
if err != nil {
return nil, fmt.Errorf("error parsing zones %s, must be strings separated by commas: %v", zonesString, err)
}
return zones, nil
}
// StringToSet converts a string containing list separated by specified delimiter to a set
func stringToSet(str, delimiter string) (sets.String, error) {
zonesSlice := strings.Split(str, delimiter)
zonesSet := make(sets.String)
for _, zone := range zonesSlice {
trimmedZone := strings.TrimSpace(zone)
if trimmedZone == "" {
return make(sets.String), fmt.Errorf(
"%q separated list (%q) must not contain an empty string",
delimiter,
str)
}
zonesSet.Insert(trimmedZone)
}
return zonesSet, nil
}
// LabelZonesToList converts a PV label value from string containing a delimited list of zones to list
func LabelZonesToList(labelZonesValue string) ([]string, error) {
return stringToList(labelZonesValue, cloudvolume.LabelMultiZoneDelimiter)
}
// StringToList converts a string containing list separated by specified delimiter to a list
func stringToList(str, delimiter string) ([]string, error) {
zonesSlice := make([]string, 0)
for _, zone := range strings.Split(str, delimiter) {
trimmedZone := strings.TrimSpace(zone)
if trimmedZone == "" {
return nil, fmt.Errorf(
"%q separated list (%q) must not contain an empty string",
delimiter,
str)
}
zonesSlice = append(zonesSlice, trimmedZone)
}
return zonesSlice, nil
}
// SelectZoneForVolume is a wrapper around SelectZonesForVolume
// to select a single zone for a volume based on parameters
func SelectZoneForVolume(zoneParameterPresent, zonesParameterPresent bool, zoneParameter string, zonesParameter, zonesWithNodes sets.String, node *v1.Node, allowedTopologies []v1.TopologySelectorTerm, pvcName string) (string, error) {
zones, err := SelectZonesForVolume(zoneParameterPresent, zonesParameterPresent, zoneParameter, zonesParameter, zonesWithNodes, node, allowedTopologies, pvcName, 1)
if err != nil {
return "", err
}
zone, ok := zones.PopAny()
if !ok {
return "", fmt.Errorf("could not determine a zone to provision volume in")
}
return zone, nil
}
// SelectZonesForVolume selects zones for a volume based on several factors:
// node.zone, allowedTopologies, zone/zones parameters from storageclass,
// zones with active nodes from the cluster. The number of zones = replicas.
func SelectZonesForVolume(zoneParameterPresent, zonesParameterPresent bool, zoneParameter string, zonesParameter, zonesWithNodes sets.String, node *v1.Node, allowedTopologies []v1.TopologySelectorTerm, pvcName string, numReplicas uint32) (sets.String, error) {
if zoneParameterPresent && zonesParameterPresent {
return nil, fmt.Errorf("both zone and zones StorageClass parameters must not be used at the same time")
}
var zoneFromNode string
// pick one zone from node if present
if node != nil {
// VolumeScheduling implicit since node is not nil
if zoneParameterPresent || zonesParameterPresent {
return nil, fmt.Errorf("zone[s] cannot be specified in StorageClass if VolumeBindingMode is set to WaitForFirstConsumer. Please specify allowedTopologies in StorageClass for constraining zones")
}
// pick node's zone for one of the replicas
var ok bool
zoneFromNode, ok = node.ObjectMeta.Labels[v1.LabelZoneFailureDomain]
if !ok {
return nil, fmt.Errorf("%s Label for node missing", v1.LabelZoneFailureDomain)
}
// if single replica volume and node with zone found, return immediately
if numReplicas == 1 {
return sets.NewString(zoneFromNode), nil
}
}
// pick zone from allowedZones if specified
allowedZones, err := ZonesFromAllowedTopologies(allowedTopologies)
if err != nil {
return nil, err
}
if (len(allowedTopologies) > 0) && (allowedZones.Len() == 0) {
return nil, fmt.Errorf("no matchLabelExpressions with %s key found in allowedTopologies. Please specify matchLabelExpressions with %s key", v1.LabelZoneFailureDomain, v1.LabelZoneFailureDomain)
}
if allowedZones.Len() > 0 {
// VolumeScheduling implicit since allowedZones present
if zoneParameterPresent || zonesParameterPresent {
return nil, fmt.Errorf("zone[s] cannot be specified in StorageClass if allowedTopologies specified")
}
// scheduler will guarantee if node != null above, zoneFromNode is member of allowedZones.
// so if zoneFromNode != "", we can safely assume it is part of allowedZones.
zones, err := chooseZonesForVolumeIncludingZone(allowedZones, pvcName, zoneFromNode, numReplicas)
if err != nil {
return nil, fmt.Errorf("cannot process zones in allowedTopologies: %v", err)
}
return zones, nil
}
// pick zone from parameters if present
if zoneParameterPresent {
if numReplicas > 1 {
return nil, fmt.Errorf("zone cannot be specified if desired number of replicas for pv is greather than 1. Please specify zones or allowedTopologies to specify desired zones")
}
return sets.NewString(zoneParameter), nil
}
if zonesParameterPresent {
if uint32(zonesParameter.Len()) < numReplicas {
return nil, fmt.Errorf("not enough zones found in zones parameter to provision a volume with %d replicas. Found %d zones, need %d zones", numReplicas, zonesParameter.Len(), numReplicas)
}
// directly choose from zones parameter; no zone from node need to be considered
return ChooseZonesForVolume(zonesParameter, pvcName, numReplicas), nil
}
// pick zone from zones with nodes
if zonesWithNodes.Len() > 0 {
// If node != null (and thus zoneFromNode != ""), zoneFromNode will be member of zonesWithNodes
zones, err := chooseZonesForVolumeIncludingZone(zonesWithNodes, pvcName, zoneFromNode, numReplicas)
if err != nil {
return nil, fmt.Errorf("cannot process zones where nodes exist in the cluster: %v", err)
}
return zones, nil
}
return nil, fmt.Errorf("cannot determine zones to provision volume in")
}
// ZonesFromAllowedTopologies returns a list of zones specified in allowedTopologies
func ZonesFromAllowedTopologies(allowedTopologies []v1.TopologySelectorTerm) (sets.String, error) {
zones := make(sets.String)
for _, term := range allowedTopologies {
for _, exp := range term.MatchLabelExpressions {
if exp.Key == v1.LabelZoneFailureDomain {
for _, value := range exp.Values {
zones.Insert(value)
}
} else {
return nil, fmt.Errorf("unsupported key found in matchLabelExpressions: %s", exp.Key)
}
}
}
return zones, nil
}
// chooseZonesForVolumeIncludingZone is a wrapper around ChooseZonesForVolume that ensures zoneToInclude is chosen
// zoneToInclude can either be empty in which case it is ignored. If non-empty, zoneToInclude is expected to be member of zones.
// numReplicas is expected to be > 0 and <= zones.Len()
func chooseZonesForVolumeIncludingZone(zones sets.String, pvcName, zoneToInclude string, numReplicas uint32) (sets.String, error) {
if numReplicas == 0 {
return nil, fmt.Errorf("invalid number of replicas passed")
}
if uint32(zones.Len()) < numReplicas {
return nil, fmt.Errorf("not enough zones found to provision a volume with %d replicas. Need at least %d distinct zones for a volume with %d replicas", numReplicas, numReplicas, numReplicas)
}
if zoneToInclude != "" && !zones.Has(zoneToInclude) {
return nil, fmt.Errorf("zone to be included: %s needs to be member of set: %v", zoneToInclude, zones)
}
if uint32(zones.Len()) == numReplicas {
return zones, nil
}
if zoneToInclude != "" {
zones.Delete(zoneToInclude)
numReplicas = numReplicas - 1
}
zonesChosen := ChooseZonesForVolume(zones, pvcName, numReplicas)
if zoneToInclude != "" {
zonesChosen.Insert(zoneToInclude)
}
return zonesChosen, nil
}
// ChooseZonesForVolume is identical to ChooseZoneForVolume, but selects a multiple zones, for multi-zone disks.
func ChooseZonesForVolume(zones sets.String, pvcName string, numZones uint32) sets.String {
// No zones available, return empty set.
replicaZones := sets.NewString()
if zones.Len() == 0 {
return replicaZones
}
// We create the volume in a zone determined by the name
// Eventually the scheduler will coordinate placement into an available zone
hash, index := getPVCNameHashAndIndexOffset(pvcName)
// Zones.List returns zones in a consistent order (sorted)
// We do have a potential failure case where volumes will not be properly spread,
// if the set of zones changes during StatefulSet volume creation. However, this is
// probably relatively unlikely because we expect the set of zones to be essentially
// static for clusters.
// Hopefully we can address this problem if/when we do full scheduler integration of
// PVC placement (which could also e.g. avoid putting volumes in overloaded or
// unhealthy zones)
zoneSlice := zones.List()
startingIndex := index * numZones
for index = startingIndex; index < startingIndex+numZones; index++ {
zone := zoneSlice[(hash+index)%uint32(len(zoneSlice))]
replicaZones.Insert(zone)
}
klog.V(2).Infof("Creating volume for replicated PVC %q; chosen zones=%q from zones=%q",
pvcName, replicaZones.UnsortedList(), zoneSlice)
return replicaZones
}
func getPVCNameHashAndIndexOffset(pvcName string) (hash uint32, index uint32) {
if pvcName == "" {
// We should always be called with a name; this shouldn't happen
klog.Warningf("No name defined during volume create; choosing random zone")
hash = rand.Uint32()
} else {
hashString := pvcName
// Heuristic to make sure that volumes in a StatefulSet are spread across zones
// StatefulSet PVCs are (currently) named ClaimName-StatefulSetName-Id,
// where Id is an integer index.
// Note though that if a StatefulSet pod has multiple claims, we need them to be
// in the same zone, because otherwise the pod will be unable to mount both volumes,
// and will be unschedulable. So we hash _only_ the "StatefulSetName" portion when
// it looks like `ClaimName-StatefulSetName-Id`.
// We continue to round-robin volume names that look like `Name-Id` also; this is a useful
// feature for users that are creating statefulset-like functionality without using statefulsets.
lastDash := strings.LastIndexByte(pvcName, '-')
if lastDash != -1 {
statefulsetIDString := pvcName[lastDash+1:]
statefulsetID, err := strconv.ParseUint(statefulsetIDString, 10, 32)
if err == nil {
// Offset by the statefulsetID, so we round-robin across zones
index = uint32(statefulsetID)
// We still hash the volume name, but only the prefix
hashString = pvcName[:lastDash]
// In the special case where it looks like `ClaimName-StatefulSetName-Id`,
// hash only the StatefulSetName, so that different claims on the same StatefulSet
// member end up in the same zone.
// Note that StatefulSetName (and ClaimName) might themselves both have dashes.
// We actually just take the portion after the final - of ClaimName-StatefulSetName.
// For our purposes it doesn't much matter (just suboptimal spreading).
lastDash := strings.LastIndexByte(hashString, '-')
if lastDash != -1 {
hashString = hashString[lastDash+1:]
}
klog.V(2).Infof("Detected StatefulSet-style volume name %q; index=%d", pvcName, index)
}
}
// We hash the (base) volume name, so we don't bias towards the first N zones
h := fnv.New32()
h.Write([]byte(hashString))
hash = h.Sum32()
}
return hash, index
}