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provider.go
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provider.go
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// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Open Component Model contributors.
//
// SPDX-License-Identifier: Apache-2.0
package flagsets
import (
"fmt"
"strings"
"github.com/open-component-model/ocm/pkg/errors"
"github.com/open-component-model/ocm/pkg/runtime"
"github.com/open-component-model/ocm/pkg/utils"
)
type ConfigProvider interface {
CreateOptions() ConfigOptions
GetConfigFor(opts ConfigOptions) (Config, error)
}
type ConfigTypeOptionSetConfigProvider interface {
ConfigProvider
ConfigOptionTypeSet
IsExplicitlySelected(opts ConfigOptions) bool
}
type _ConfigTypeOptionSetConfigProvider = ConfigTypeOptionSetConfigProvider
////////////////////////////////////////////////////////////////////////////////
type plainConfigProvider struct {
ConfigOptionTypeSetHandler
}
var _ ConfigTypeOptionSetConfigProvider = (*plainConfigProvider)(nil)
func NewPlainConfigProvider(name string, adder ConfigAdder, types ...ConfigOptionType) ConfigTypeOptionSetConfigProvider {
h := NewConfigOptionTypeSetHandler(name, adder, types...)
return &plainConfigProvider{
ConfigOptionTypeSetHandler: h,
}
}
func (p *plainConfigProvider) GetConfigOptionTypeSet() ConfigOptionTypeSet {
return p
}
func (p *plainConfigProvider) IsExplicitlySelected(opts ConfigOptions) bool {
return opts.FilterBy(p.HasOptionType).Changed()
}
func (p *plainConfigProvider) GetConfigFor(opts ConfigOptions) (Config, error) {
if !p.IsExplicitlySelected(opts) {
return nil, nil
}
config := Config{}
err := p.ApplyConfig(opts, config)
return config, err
}
////////////////////////////////////////////////////////////////////////////////
type typedConfigProvider struct {
_ConfigTypeOptionSetConfigProvider
typeOption string
}
var _ ConfigTypeOptionSetConfigProvider = (*typedConfigProvider)(nil)
func NewTypedConfigProvider(name string, desc, typeOption string, acceptUnknown ...bool) ConfigTypeOptionSetConfigProvider {
return &typedConfigProvider{NewTypedConfigProviderBase(name, desc, TypeNameProviderFromOptions(typeOption), utils.Optional(acceptUnknown...), NewStringOptionType(name+"Type", "type of "+desc)), typeOption}
}
func (p *typedConfigProvider) IsExplicitlySelected(opts ConfigOptions) bool {
return opts.Changed(p.typeOption, p.GetName())
}
func TypeNameProviderFromOptions(name string) TypeNameProvider {
return func(opts ConfigOptions) (string, error) {
typv, _ := opts.GetValue(name)
typ, ok := typv.(string)
if !ok {
return "", fmt.Errorf("failed to assert type %T as string", typv)
}
return typ, nil
}
}
///////////////////////////////////////////////////////////////////////////////
type ExplicitlyTypedConfigTypeOptionSetConfigProvider interface {
ConfigTypeOptionSetConfigProvider
SetTypeName(n string)
}
type explicitlyTypedConfigProvider struct {
_ConfigTypeOptionSetConfigProvider
typeName string
}
var _ ConfigTypeOptionSetConfigProvider = (*typedConfigProvider)(nil)
func NewExplicitlyTypedConfigProvider(name string, desc string, acceptUnknown ...bool) ExplicitlyTypedConfigTypeOptionSetConfigProvider {
p := &explicitlyTypedConfigProvider{}
p._ConfigTypeOptionSetConfigProvider = NewTypedConfigProviderBase(name, desc, p.getTypeName, utils.Optional(acceptUnknown...))
return p
}
func (p *explicitlyTypedConfigProvider) SetTypeName(n string) {
p.typeName = n
}
func (p *explicitlyTypedConfigProvider) getTypeName(opts ConfigOptions) (string, error) {
return p.typeName, nil
}
////////////////////////////////////////////////////////////////////////////////
type TypeNameProvider func(opts ConfigOptions) (string, error)
type typedConfigProviderBase struct {
ConfigOptionTypeSet
typeProvider TypeNameProvider
meta ConfigOptionTypeSet
acceptUnknown bool
}
var _ ConfigTypeOptionSetConfigProvider = (*typedConfigProviderBase)(nil)
func NewTypedConfigProviderBase(name string, desc string, prov TypeNameProvider, acceptUnknown bool, types ...ConfigOptionType) ConfigTypeOptionSetConfigProvider {
set := NewConfigOptionTypeSet(name, append(types, NewValueMapYAMLOptionType(name, desc+" (YAML)"))...)
return &typedConfigProviderBase{
ConfigOptionTypeSet: set,
typeProvider: prov,
meta: NewConfigOptionTypeSet(name, append(types, NewValueMapYAMLOptionType(name, desc+" (YAML)"))...),
acceptUnknown: acceptUnknown,
}
}
func (p *typedConfigProviderBase) GetConfigOptionTypeSet() ConfigOptionTypeSet {
return p
}
func (p *typedConfigProviderBase) IsExplicitlySelected(opts ConfigOptions) bool {
t, err := p.typeProvider(opts)
return err == nil && t != ""
}
func (p *typedConfigProviderBase) GetConfigFor(opts ConfigOptions) (Config, error) {
typ, err := p.typeProvider(opts)
if err != nil {
return nil, err
}
cfgv, _ := opts.GetValue(p.GetName())
var data Config
if cfgv != nil {
var ok bool
data, ok = cfgv.(Config)
if !ok {
return nil, fmt.Errorf("failed to assert type %T as Config", cfgv)
}
}
opts = opts.FilterBy(p.HasOptionType)
if typ == "" && data != nil && data["type"] != nil {
t := data["type"]
if t != nil {
if s, ok := t.(string); ok {
typ = s
} else {
return nil, fmt.Errorf("type field must be a string")
}
}
}
if opts.Changed() || typ != "" {
if typ == "" {
return nil, fmt.Errorf("type required for explicitly configured options")
}
if data == nil {
data = Config{}
}
data["type"] = typ
if err := p.applyConfigForType(typ, opts, data); err != nil {
if !p.acceptUnknown || !errors.Is(err, errors.ErrUnknown(typ)) {
return nil, err
}
unexpected := opts.FilterBy(And(Changed(opts), Not(p.meta.HasOptionType))).Names()
if len(unexpected) > 0 {
return nil, fmt.Errorf("unexpected options %s", strings.Join(unexpected, ", "))
}
}
}
return data, nil
}
func (p *typedConfigProviderBase) GetTypeSetForType(name string) ConfigOptionTypeSet {
set := p.GetTypeSet(name)
if set == nil {
k, v := runtime.KindVersion(name)
if v == "" {
set = p.GetTypeSet(runtime.TypeName(name, "v1"))
} else if v == "v1" {
set = p.GetTypeSet(k)
}
}
return set
}
func (p *typedConfigProviderBase) applyConfigForType(name string, opts ConfigOptions, config Config) error {
set := p.GetTypeSetForType(name)
if set == nil {
return errors.ErrUnknown(name)
}
opts = opts.FilterBy(Not(p.meta.HasOptionType))
err := opts.Check(set, p.GetName()+" type "+name)
if err != nil {
return err
}
handler, ok := set.(ConfigHandler)
if !ok {
return fmt.Errorf("no config handler defined for %s type %s", p.GetName(), name)
}
return handler.ApplyConfig(opts, config)
}