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Merge pull request #1377 from wearemolecule/topic/aws-provider
Automatic merge from submit-queue Cluster-autoscaler: cloud provider interface implementation for AWS Part of #1311 <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.kubernetes.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.kubernetes.io/reviews/kubernetes/contrib/1377) <!-- Reviewable:end -->
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cluster-autoscaler/cloudprovider/aws/aws_cloud_provider.go
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/* | ||
Copyright 2016 The Kubernetes Authors All rights reserved. | ||
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. | ||
*/ | ||
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package aws | ||
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import ( | ||
"fmt" | ||
"regexp" | ||
"strconv" | ||
"strings" | ||
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"k8s.io/contrib/cluster-autoscaler/cloudprovider" | ||
kube_api "k8s.io/kubernetes/pkg/api" | ||
) | ||
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// AwsCloudProvider implements CloudProvider interface. | ||
type AwsCloudProvider struct { | ||
awsManager *AwsManager | ||
asgs []*Asg | ||
} | ||
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// BuildAwsCloudProvider builds CloudProvider implementation for AWS. | ||
func BuildAwsCloudProvider(awsManager *AwsManager, specs []string) (*AwsCloudProvider, error) { | ||
aws := &AwsCloudProvider{ | ||
awsManager: awsManager, | ||
asgs: make([]*Asg, 0), | ||
} | ||
for _, spec := range specs { | ||
if err := aws.addNodeGroup(spec); err != nil { | ||
return nil, err | ||
} | ||
} | ||
return aws, nil | ||
} | ||
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// addNodeGroup adds node group defined in string spec. Format: | ||
// minNodes:maxNodes:asgName | ||
func (aws *AwsCloudProvider) addNodeGroup(spec string) error { | ||
asg, err := buildAsg(spec, aws.awsManager) | ||
if err != nil { | ||
return err | ||
} | ||
aws.asgs = append(aws.asgs, asg) | ||
aws.awsManager.RegisterAsg(asg) | ||
return nil | ||
} | ||
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// Name returns name of the cloud provider. | ||
func (aws *AwsCloudProvider) Name() string { | ||
return "aws" | ||
} | ||
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// NodeGroups returns all node groups configured for this cloud provider. | ||
func (aws *AwsCloudProvider) NodeGroups() []cloudprovider.NodeGroup { | ||
result := make([]cloudprovider.NodeGroup, 0, len(aws.asgs)) | ||
for _, asg := range aws.asgs { | ||
result = append(result, asg) | ||
} | ||
return result | ||
} | ||
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// NodeGroupForNode returns the node group for the given node. | ||
func (aws *AwsCloudProvider) NodeGroupForNode(node *kube_api.Node) (cloudprovider.NodeGroup, error) { | ||
ref, err := AwsRefFromProviderId(node.Spec.ProviderID) | ||
if err != nil { | ||
return nil, err | ||
} | ||
asg, err := aws.awsManager.GetAsgForInstance(ref) | ||
return asg, err | ||
} | ||
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// AwsRef contains a reference to some entity in AWS/GKE world. | ||
type AwsRef struct { | ||
Name string | ||
} | ||
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// AwsRefFromProviderId creates InstanceConfig object from provider id which | ||
// must be in format: aws:///zone/name | ||
func AwsRefFromProviderId(id string) (*AwsRef, error) { | ||
validIdRegex := regexp.MustCompile(`^aws\:\/\/\/[-0-9a-z]*\/[-0-9a-z]*$`) | ||
if validIdRegex.FindStringSubmatch(id) == nil { | ||
return nil, fmt.Errorf("Wrong id: expected format aws:///<zone>/<name>, got %v", id) | ||
} | ||
splitted := strings.Split(id[7:], "/") | ||
return &AwsRef{ | ||
Name: splitted[1], | ||
}, nil | ||
} | ||
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// Asg implements NodeGroup interfrace. | ||
type Asg struct { | ||
AwsRef | ||
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awsManager *AwsManager | ||
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minSize int | ||
maxSize int | ||
} | ||
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// MaxSize returns maximum size of the node group. | ||
func (asg *Asg) MaxSize() int { | ||
return asg.maxSize | ||
} | ||
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// MinSize returns minimum size of the node group. | ||
func (asg *Asg) MinSize() int { | ||
return asg.minSize | ||
} | ||
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// TargetSize returns the current TARGET size of the node group. It is possible that the | ||
// number is different from the number of nodes registered in Kuberentes. | ||
func (asg *Asg) TargetSize() (int, error) { | ||
size, err := asg.awsManager.GetAsgSize(asg) | ||
return int(size), err | ||
} | ||
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// IncreaseSize increases Asg size | ||
func (asg *Asg) IncreaseSize(delta int) error { | ||
if delta <= 0 { | ||
return fmt.Errorf("size increase must be positive") | ||
} | ||
size, err := asg.awsManager.GetAsgSize(asg) | ||
if err != nil { | ||
return err | ||
} | ||
if int(size)+delta > asg.MaxSize() { | ||
return fmt.Errorf("size increase too large - desired:%d max:%d", int(size)+delta, asg.MaxSize()) | ||
} | ||
return asg.awsManager.SetAsgSize(asg, size+int64(delta)) | ||
} | ||
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// Belongs returns true if the given node belongs to the NodeGroup. | ||
func (asg *Asg) Belongs(node *kube_api.Node) (bool, error) { | ||
ref, err := AwsRefFromProviderId(node.Spec.ProviderID) | ||
if err != nil { | ||
return false, err | ||
} | ||
targetAsg, err := asg.awsManager.GetAsgForInstance(ref) | ||
if err != nil { | ||
return false, err | ||
} | ||
if targetAsg == nil { | ||
return false, fmt.Errorf("%s doesn't belong to a known asg", node.Name) | ||
} | ||
if targetAsg.Id() != asg.Id() { | ||
return false, nil | ||
} | ||
return true, nil | ||
} | ||
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// DeleteNodes deletes the nodes from the group. | ||
func (asg *Asg) DeleteNodes(nodes []*kube_api.Node) error { | ||
size, err := asg.awsManager.GetAsgSize(asg) | ||
if err != nil { | ||
return err | ||
} | ||
if int(size) <= asg.MinSize() { | ||
return fmt.Errorf("min size reached, nodes will not be deleted") | ||
} | ||
refs := make([]*AwsRef, 0, len(nodes)) | ||
for _, node := range nodes { | ||
belongs, err := asg.Belongs(node) | ||
if err != nil { | ||
return err | ||
} | ||
if belongs != true { | ||
return fmt.Errorf("%s belongs to a different asg than %s", node.Name, asg.Id()) | ||
} | ||
awsref, err := AwsRefFromProviderId(node.Spec.ProviderID) | ||
if err != nil { | ||
return err | ||
} | ||
refs = append(refs, awsref) | ||
} | ||
return asg.awsManager.DeleteInstances(refs) | ||
} | ||
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// Id returns asg id. | ||
func (asg *Asg) Id() string { | ||
return asg.Name | ||
} | ||
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// Debug returns a debug string for the Asg. | ||
func (asg *Asg) Debug() string { | ||
return fmt.Sprintf("%s (%d:%d)", asg.Id(), asg.MinSize(), asg.MaxSize()) | ||
} | ||
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func buildAsg(value string, awsManager *AwsManager) (*Asg, error) { | ||
tokens := strings.SplitN(value, ":", 3) | ||
if len(tokens) != 3 { | ||
return nil, fmt.Errorf("wrong nodes configuration: %s", value) | ||
} | ||
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asg := Asg{ | ||
awsManager: awsManager, | ||
} | ||
if size, err := strconv.Atoi(tokens[0]); err == nil { | ||
if size <= 0 { | ||
return nil, fmt.Errorf("min size must be >= 1") | ||
} | ||
asg.minSize = size | ||
} else { | ||
return nil, fmt.Errorf("failed to set min size: %s, expected integer", tokens[0]) | ||
} | ||
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if size, err := strconv.Atoi(tokens[1]); err == nil { | ||
if size < asg.minSize { | ||
return nil, fmt.Errorf("max size must be greater or equal to min size") | ||
} | ||
asg.maxSize = size | ||
} else { | ||
return nil, fmt.Errorf("failed to set max size: %s, expected integer", tokens[1]) | ||
} | ||
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if tokens[2] == "" { | ||
return nil, fmt.Errorf("asg name must not be blank: %s got error: %v", tokens[2]) | ||
} | ||
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asg.Name = tokens[2] | ||
return &asg, nil | ||
} |
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