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config_manager.go
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/
config_manager.go
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package cluster
import (
"errors"
"fmt"
"regexp"
"strings"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"sigs.k8s.io/yaml"
anywherev1 "github.com/aws/eks-anywhere/pkg/api/v1alpha1"
"github.com/aws/eks-anywhere/pkg/logger"
)
// ConfigManager allows to parse from yaml, set defaults and validate a Cluster struct
// It allows to dynamically register configuration for all those operations.
type ConfigManager struct { // TODO: find a better name
entry *ConfigManagerEntry
}
// NewConfigManager builds a ConfigManager with empty configuration.
func NewConfigManager() *ConfigManager {
return &ConfigManager{
entry: NewConfigManagerEntry(),
}
}
// Register records the configuration defined in a ConfigManagerEntry into the ConfigManager
// This is equivalent to the individual register methods.
func (c *ConfigManager) Register(entries ...*ConfigManagerEntry) error {
return c.entry.Merge(entries...)
}
// RegisterMapping records the mapping between a kubernetes Kind and an API concrete type.
func (c *ConfigManager) RegisterMapping(kind string, generator APIObjectGenerator) error {
return c.entry.RegisterMapping(kind, generator)
}
// RegisterProcessors records setters to fill the Config struct from the parsed API objects.
func (c *ConfigManager) RegisterProcessors(processors ...ParsedProcessor) {
c.entry.RegisterProcessors(processors...)
}
// RegisterValidations records validations for a Config struct.
func (c *ConfigManager) RegisterValidations(validations ...Validation) {
c.entry.RegisterValidations(validations...)
}
// RegisterDefaulters records defaults for a Config struct.
func (c *ConfigManager) RegisterDefaulters(defaulters ...Defaulter) {
c.entry.RegisterDefaulters(defaulters...)
}
// Parse reads yaml manifest with at least one cluster object and generates the corresponding Config.
func (c *ConfigManager) Parse(yamlManifest []byte) (*Config, error) {
parsed, err := c.unmarshal(yamlManifest)
if err != nil {
return nil, err
}
return c.buildConfigFromParsed(parsed)
}
// Parse set the registered defaults in a Config struct.
func (c *ConfigManager) SetDefaults(config *Config) error {
var allErrs []error
for _, d := range c.entry.Defaulters {
if err := d(config); err != nil {
allErrs = append(allErrs, err)
}
}
if len(allErrs) > 0 {
aggregate := utilerrors.NewAggregate(allErrs)
return fmt.Errorf("setting defaults on cluster config: %v", aggregate)
}
return nil
}
// Validate performs the registered validations in a Config struct.
func (c *ConfigManager) Validate(config *Config) error {
var allErrs []error
for _, v := range c.entry.Validations {
if err := v(config); err != nil {
allErrs = append(allErrs, err)
}
}
if len(allErrs) > 0 {
aggregate := utilerrors.NewAggregate(allErrs)
return fmt.Errorf("invalid cluster config: %v", aggregate)
}
return nil
}
type basicAPIObject struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`
}
func (k *basicAPIObject) empty() bool {
return k.APIVersion == "" && k.Kind == ""
}
type parsed struct {
objects ObjectLookup
cluster *anywherev1.Cluster
}
var separatorRegex = regexp.MustCompile(`(?m)^---$`)
func (c *ConfigManager) unmarshal(yamlManifest []byte) (*parsed, error) {
parsed := &parsed{
objects: ObjectLookup{},
}
yamlObjs := separatorRegex.Split(string(yamlManifest), -1)
for _, yamlObj := range yamlObjs {
trimmedYamlObj := strings.TrimSuffix(yamlObj, "\n")
k := &basicAPIObject{}
err := yaml.Unmarshal([]byte(trimmedYamlObj), k)
if err != nil {
return nil, err
}
// Ignore empty objects.
// Empty objects are generated if there are weird things in manifest files like e.g. two --- in a row without a yaml doc in the middle
if k.empty() {
continue
}
if k.APIVersion == "" {
return nil, fmt.Errorf("apiVersion not set for Kind: %s", k.Kind)
}
var obj APIObject
if k.Kind == anywherev1.ClusterKind {
if parsed.cluster != nil {
return nil, errors.New("only one Cluster per yaml manifest is allowed")
}
parsed.cluster = &anywherev1.Cluster{}
obj = parsed.cluster
} else if generateApiObj, ok := c.entry.APIObjectMapping[k.Kind]; ok {
obj = generateApiObj()
} else {
logger.V(2).Info("Ignoring object in yaml of unknown type when parsing cluster Config", "kind", k.Kind)
continue
}
if err := yaml.Unmarshal([]byte(trimmedYamlObj), obj); err != nil {
return nil, err
}
parsed.objects.add(obj)
}
return parsed, nil
}
func (c *ConfigManager) buildConfigFromParsed(p *parsed) (*Config, error) {
if p.cluster == nil {
return nil, errors.New("no Cluster found in manifest")
}
config := &Config{
Cluster: p.cluster,
}
for _, processor := range c.entry.Processors {
processor(config, p.objects)
}
return config, nil
}
// machineConfigsProcessor is a helper to generate a ParsedProcessor for all machine configs in a Cluster.
func machineConfigsProcessor(processMachineRef func(c *Config, o ObjectLookup, machineRef *anywherev1.Ref)) ParsedProcessor {
return func(c *Config, o ObjectLookup) {
for _, m := range c.Cluster.MachineConfigRefs() {
processMachineRef(c, o, &m)
}
}
}