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scheme.go
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scheme.go
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/*
* Copyright 2018 The Service Manager 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 postgres
import (
"fmt"
"reflect"
"github.com/Peripli/service-manager/pkg/types"
"github.com/Peripli/service-manager/storage"
)
type entityProvider func() (PostgresEntity, error)
type objectConverter func(object types.Object) (PostgresEntity, error)
func newScheme() *scheme {
return &scheme{
instanceProviders: make(map[types.ObjectType]entityProvider),
converters: make(map[types.ObjectType]objectConverter),
}
}
type scheme struct {
instanceProviders map[types.ObjectType]entityProvider
converters map[types.ObjectType]objectConverter
}
func (s *scheme) introduce(entity storage.Entity) {
t := reflect.TypeOf(entity)
if t.Kind() != reflect.Ptr {
panic("All entities must be pointers to structs.")
}
obj := entity.ToObject()
objType := obj.GetType()
_, providerAlreadyExists := s.instanceProviders[objType]
_, converterAlreadyExists := s.converters[objType]
if providerAlreadyExists || converterAlreadyExists {
panic(fmt.Sprintf("Entity for object with type %s has already been introduced", objType))
}
s.instanceProviders[objType] = func() (PostgresEntity, error) {
pgEntity, ok := entity.(PostgresEntity)
if !ok {
return nil, fmt.Errorf("no postgres entity is introduced for object of type %s", objType)
}
return pgEntity, nil
}
s.converters[objType] = func(object types.Object) (PostgresEntity, error) {
entityFromObject, ok := entity.FromObject(object)
if !ok {
return nil, fmt.Errorf("regsitered entity cannot convert object from type %s", object.GetType())
}
pgEntity, ok := entityFromObject.(PostgresEntity)
if !ok {
return nil, fmt.Errorf("no postgres entity is introduced for object of type %s", object.GetType())
}
return pgEntity, nil
}
}
func (s *scheme) convert(object types.Object) (PostgresEntity, error) {
objectType := object.GetType()
converter, exists := s.converters[objectType]
if !exists {
return nil, fmt.Errorf("no postgres entity is introduced for object of type %s", objectType)
}
return converter(object)
}
func (s *scheme) provide(objectType types.ObjectType) (PostgresEntity, error) {
provider, exists := s.instanceProviders[objectType]
if !exists {
return nil, fmt.Errorf("no postgres entity is introduced for object of type %s", objectType)
}
return provider()
}