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store.go
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store.go
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// Copyright (c) 2019 Cisco and/or its affiliates.
//
// 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 orchestrator
import (
"context"
"sort"
"github.com/gogo/protobuf/proto"
)
// KVStore describes an interface for key-value store used by dispatcher.
type KVStore interface {
ListAll() KVPairs
List(dataSrc string) KVPairs
Update(dataSrc, key string, val proto.Message)
Delete(dataSrc, key string)
Reset(dataSrc string)
}
// memStore is KVStore implementation that stores data in memory.
type memStore struct {
db map[string]KVPairs
}
func newMemStore() *memStore {
return &memStore{
db: make(map[string]KVPairs),
}
}
// List lists all key-value pairs.
func (s *memStore) ListAll() KVPairs {
var dataSrcs []string
for dataSrc := range s.db {
dataSrcs = append(dataSrcs, dataSrc)
}
sort.Strings(dataSrcs)
pairs := make(KVPairs)
for _, dataSrc := range dataSrcs {
for k, v := range s.List(dataSrc) {
pairs[k] = v
}
}
return pairs
}
// List lists actual key-value pairs.
func (s *memStore) List(dataSrc string) KVPairs {
pairs := make(KVPairs, len(s.db[dataSrc]))
for k, v := range s.db[dataSrc] {
pairs[k] = v
}
return pairs
}
// Update updates value stored under key with given value.
func (s *memStore) Update(dataSrc, key string, val proto.Message) {
if _, ok := s.db[dataSrc]; !ok {
s.db[dataSrc] = make(KVPairs)
}
s.db[dataSrc][key] = val
}
// Delete deletes value stored under given key.
func (s *memStore) Delete(dataSrc, key string) {
delete(s.db[dataSrc], key)
}
// Reset clears all key-value data.
func (s *memStore) Reset(dataSrc string) {
delete(s.db, dataSrc)
}
type dataSrcKeyT string
var dataSrcKey = dataSrcKeyT("dataSrc")
func DataSrcContext(ctx context.Context, dataSrc string) context.Context {
return context.WithValue(ctx, dataSrcKey, dataSrc)
}
func DataSrcFromContext(ctx context.Context) (dataSrc string, ok bool) {
dataSrc, ok = ctx.Value(dataSrcKey).(string)
return
}