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registry.go
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registry.go
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// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation and Dapr Contributors.
// Licensed under the MIT License.
// ------------------------------------------------------------
package configuration
import (
"strings"
"github.com/pkg/errors"
"github.com/dapr/components-contrib/configuration"
"github.com/dapr/dapr/pkg/components"
)
type Configuration struct {
Name string
FactoryMethod func() configuration.Store
}
func New(name string, factoryMethod func() configuration.Store) Configuration {
return Configuration{
Name: name,
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 {
s.configurationStores[createFullName(component.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)
}