/
multi_catalog.go
130 lines (107 loc) · 3.63 KB
/
multi_catalog.go
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// Copyright 2016 IBM Corporation
//
// 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 store
import (
"github.com/amalgam8/amalgam8/pkg/auth"
)
const (
rwCatalogIndex int = 0
)
type multiConfig struct {
factories []CatalogFactory
}
type multiFactory struct {
conf *multiConfig
}
func newMultiFactory(conf *multiConfig) *multiFactory {
return &multiFactory{conf: conf}
}
func (f *multiFactory) CreateCatalog(namespace auth.Namespace) (Catalog, error) {
return newMultiCatalog(namespace, f.conf)
}
// MultiCatalog is a collection of catalogs.
// The catalog at index 0 (rwCalogIndex) is the Read-Write catalog. The other catalogs are Read-Only.
type multiCatalog struct {
catalogs []Catalog
}
func newMultiCatalog(namespace auth.Namespace, conf *multiConfig) (*multiCatalog, error) {
catalogs := make([]Catalog, 0, len(conf.factories))
for _, factory := range conf.factories {
catalog, err := factory.CreateCatalog(namespace)
if err != nil {
return nil, err
} else if catalog != nil {
catalogs = append(catalogs, catalog)
}
}
return &multiCatalog{catalogs: catalogs}, nil
}
func (mc *multiCatalog) Register(si *ServiceInstance) (*ServiceInstance, error) {
return mc.catalogs[rwCatalogIndex].Register(si)
}
func (mc *multiCatalog) Deregister(instanceID string) (*ServiceInstance, error) {
return mc.catalogs[rwCatalogIndex].Deregister(instanceID)
}
func (mc *multiCatalog) Renew(instanceID string) (*ServiceInstance, error) {
return mc.catalogs[rwCatalogIndex].Renew(instanceID)
}
func (mc *multiCatalog) SetStatus(instanceID, status string) (*ServiceInstance, error) {
return mc.catalogs[rwCatalogIndex].SetStatus(instanceID, status)
}
func (mc *multiCatalog) List(serviceName string, predicate Predicate) ([]*ServiceInstance, error) {
isErr := true
instanceCollection := make([]*ServiceInstance, 0, 10)
for _, catalog := range mc.catalogs {
list, err := catalog.List(serviceName, predicate)
// We don't log the error here, because an error ("no such service") is acceptable.
// We will return an error at the end if and only if the list is empty
if err == nil {
isErr = false
if len(list) > 0 {
instanceCollection = append(instanceCollection, list...)
}
}
}
// If and only if all the sub-catalogs returned an error then we have to
// return an error
if isErr {
return nil, NewError(ErrorNoSuchServiceName, "no such service", serviceName)
}
return instanceCollection, nil
}
func (mc *multiCatalog) Instance(instanceID string) (*ServiceInstance, error) {
for _, catalog := range mc.catalogs {
si, err := catalog.Instance(instanceID)
if err == nil {
return si, nil
}
}
return nil, NewError(ErrorNoSuchServiceInstance, "no such service instance", instanceID)
}
func (mc *multiCatalog) ListServices(predicate Predicate) []*Service {
smap := make(map[string]*Service)
for _, catalog := range mc.catalogs {
lServices := catalog.ListServices(predicate)
if len(lServices) > 0 {
for _, svc := range lServices {
smap[svc.ServiceName] = svc
}
}
}
services := make([]*Service, 0, len(smap))
for _, svc := range smap {
services = append(services, svc)
}
return services
}