add-on-hollow-nodes-local.go

package eksconfig

import (
	"fmt"

	"github.com/aws/aws-k8s-tester/pkg/randutil"
	"github.com/aws/aws-k8s-tester/pkg/timeutil"
)

// AddOnHollowNodesLocal defines parameters for EKS cluster
// add-on hollow nodes local.
// It generates loads from the local host machine.
// Every object is written serially with no concurrency.
// Use remote tester to write with concurrency.
type AddOnHollowNodesLocal struct {
	// Enable is 'true' to create this add-on.
	Enable bool `json:"enable"`
	// Created is true when the resource has been created.
	// Used for delete operations.
	Created         bool               `json:"created" read-only:"true"`
	TimeFrameCreate timeutil.TimeFrame `json:"time-frame-create" read-only:"true"`
	TimeFrameDelete timeutil.TimeFrame `json:"time-frame-delete" read-only:"true"`

	// Nodes is the number of hollow nodes to create.
	Nodes int `json:"nodes"`

	// NodeNamePrefix is the node name prefix for node names.
	NodeNamePrefix string `json:"node-name-prefix"`
	// NodeLabelPrefix is the node prefix.
	NodeLabelPrefix string `json:"node-label-prefix"`
	// NodeLabels is the node labels to attach when creating hollow nodes.
	NodeLabels map[string]string `json:"node-labels" read-only:"true"`

	// MaxOpenFiles is number of files that can be opened by hollow node kubelet process.
	// "cmd/kubelet/app.rlimit.SetNumFiles(MaxOpenFiles)" sets this for the host.
	// More than >100 node may exceed local system file descriptor limits.
	// e.g. too many open files
	MaxOpenFiles int64 `json:"max-open-files"`

	// CreatedNodeNames is the list of created "Node" object names.
	CreatedNodeNames []string `json:"created-node-names" read-only:"true"`
}

// EnvironmentVariablePrefixAddOnHollowNodesLocal is the environment variable prefix used for "eksconfig".
const EnvironmentVariablePrefixAddOnHollowNodesLocal = AWS_K8S_TESTER_EKS_PREFIX + "ADD_ON_HOLLOW_NODES_LOCAL_"

// IsEnabledAddOnHollowNodesLocal returns true if "AddOnHollowNodesLocal" is enabled.
// Otherwise, nil the field for "omitempty".
func (cfg *Config) IsEnabledAddOnHollowNodesLocal() bool {
	if cfg.AddOnHollowNodesLocal == nil {
		return false
	}
	if cfg.AddOnHollowNodesLocal.Enable {
		return true
	}
	cfg.AddOnHollowNodesLocal = nil
	return false
}

func getDefaultAddOnHollowNodesLocal() *AddOnHollowNodesLocal {
	return &AddOnHollowNodesLocal{
		Enable:         false,
		Nodes:          2,
		NodeNamePrefix: "hollow" + randutil.String(5),
		MaxOpenFiles:   1000000,
	}
}

func (cfg *Config) validateAddOnHollowNodesLocal() error {
	if !cfg.IsEnabledAddOnHollowNodesLocal() {
		return nil
	}

	if cfg.AddOnHollowNodesLocal.Nodes == 0 {
		cfg.AddOnHollowNodesLocal.Nodes = 2
	}
	if cfg.AddOnHollowNodesLocal.NodeNamePrefix == "" {
		cfg.AddOnHollowNodesLocal.NodeNamePrefix = "hollow" + randutil.String(5)
	}
	// e.g. Unable to register node "fake-node-000004-evere" with API server: Node "fake-node-000004-evere" is invalid: [metadata.labels: Invalid value: "...-hollow-nodes-remote-fake-ami-type-duneg": must be no more than 63 characters, metadata.labels: Invalid value: "...-hollow-nodes-remote-fake-ng-name-duneg": must be no more than 63 characters, metadata.labels: Invalid value: "...-hollow-nodes-remote-fake-ng-type-duneg": must be no more than 63 characters]
	if cfg.AddOnHollowNodesLocal.NodeLabelPrefix == "" {
		cfg.AddOnHollowNodesLocal.NodeLabelPrefix = "hollow" + randutil.String(5)
	}
	if len(cfg.AddOnHollowNodesLocal.NodeLabelPrefix) > 55 {
		return fmt.Errorf("invalid node label prefix %q (%d characters, label value can not be more than 63 characters)", cfg.AddOnHollowNodesLocal.NodeLabelPrefix, len(cfg.AddOnHollowNodesLocal.NodeLabelPrefix))
	}
	cfg.AddOnHollowNodesLocal.NodeLabels = map[string]string{
		"NodeType": "hollow-node",
		"AMIType":  cfg.AddOnHollowNodesLocal.NodeLabelPrefix + "-ami-type",
		"NGType":   cfg.AddOnHollowNodesLocal.NodeLabelPrefix + "-ng-type",
		"NGName":   cfg.AddOnHollowNodesLocal.NodeLabelPrefix + "-ng-name",
	}

	if cfg.AddOnHollowNodesLocal.MaxOpenFiles == 0 {
		cfg.AddOnHollowNodesLocal.MaxOpenFiles = 1000000
	}

	return nil
}