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registry.go
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registry.go
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/*
Copyright 2021 The Dapr 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 configuration
import (
"strings"
"github.com/pkg/errors"
"github.com/dapr/components-contrib/configuration"
"github.com/dapr/dapr/pkg/components"
)
type Configuration struct {
Names []string
FactoryMethod func() configuration.Store
}
// New creates a new Configuration.
func New(name string, factoryMethod func() configuration.Store, aliases ...string) Configuration {
names := []string{name}
if len(aliases) > 0 {
names = append(names, aliases...)
}
return Configuration{
Names: names,
FactoryMethod: factoryMethod,
}
}
// Registry is an interface for a component that returns registered configuration store implementations.
type Registry interface {
Register(components ...Configuration)
Create(name, version string) (configuration.Store, error)
}
type configurationStoreRegistry struct {
configurationStores map[string]func() configuration.Store
}
// NewRegistry is used to create configuration store registry.
func NewRegistry() Registry {
return &configurationStoreRegistry{
configurationStores: map[string]func() configuration.Store{},
}
}
// Register registers a new factory method that creates an instance of a ConfigurationStore.
// The key is the name of the state store, eg. redis.
func (s *configurationStoreRegistry) Register(components ...Configuration) {
for _, component := range components {
for _, name := range component.Names {
s.configurationStores[createFullName(name)] = component.FactoryMethod
}
}
}
func (s *configurationStoreRegistry) Create(name, version string) (configuration.Store, error) {
if method, ok := s.getConfigurationStore(name, version); ok {
return method(), nil
}
return nil, errors.Errorf("couldn't find configuration store %s/%s", name, version)
}
func (s *configurationStoreRegistry) getConfigurationStore(name, version string) (func() configuration.Store, bool) {
nameLower := strings.ToLower(name)
versionLower := strings.ToLower(version)
configurationStoreFn, ok := s.configurationStores[nameLower+"/"+versionLower]
if ok {
return configurationStoreFn, true
}
if components.IsInitialVersion(versionLower) {
configurationStoreFn, ok = s.configurationStores[nameLower]
}
return configurationStoreFn, ok
}
func createFullName(name string) string {
return strings.ToLower("configuration." + name)
}