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kv.go
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kv.go
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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// 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 kv
import (
"errors"
"fmt"
"github.com/vmware/vic/lib/apiservers/portlayer/client"
ckv "github.com/vmware/vic/lib/apiservers/portlayer/client/kv"
"github.com/vmware/vic/lib/apiservers/portlayer/models"
"github.com/vmware/vic/pkg/trace"
"context"
log "github.com/Sirupsen/logrus"
)
const (
// defaultNamespace is the first part of the
// k/v store key (i.e. docker.stuff)
defaultNamespace = "docker"
defaultSeparator = "."
)
var (
ErrKeyNotFound = errors.New("key not found")
)
// Get will call to the portlayer for the value of the specified key
// The key argument is prefixed w/the defaultName space for the docker
// persona. i.e. docker.{key}
//
// If the key doesn't exist an ErrKeyNotFound will be returned
func Get(client *client.PortLayer, key string) (string, error) {
defer trace.End(trace.Begin(key))
var val string
resp, err := client.Kv.GetValue(ckv.NewGetValueParamsWithContext(
context.Background()).WithKey(createNameSpacedKey(key)))
if err != nil {
switch err.(type) {
case *ckv.GetValueNotFound:
return val, ErrKeyNotFound
default:
log.Errorf("Error Getting Key/Value: %s", err.Error())
return val, err
}
}
val = resp.Payload.Value
// return the value
return val, nil
}
// Put will put the key / value in the portlayer k/v store
func Put(client *client.PortLayer, key string, val string) error {
defer trace.End(trace.Begin(key))
fullKey := createNameSpacedKey(key)
keyval := &models.KeyValue{
Key: fullKey,
Value: val,
}
_, err := client.Kv.PutValue(ckv.NewPutValueParamsWithContext(
context.Background()).WithKey(fullKey).WithKeyValue(keyval))
if err != nil {
log.Errorf("Error Putting Key/Value: %s", err)
return err
}
return nil
}
// Delete will remove the key / value from the store
func Delete(client *client.PortLayer, key string) error {
defer trace.End(trace.Begin(key))
_, err := client.Kv.DeleteValue(ckv.NewDeleteValueParamsWithContext(
context.Background()).WithKey(createNameSpacedKey(key)))
if err != nil {
log.Errorf("Error Deleting Key/Value: %s", err)
return err
}
return nil
}
func createNameSpacedKey(key string) string {
return fmt.Sprintf("%s%s%s", defaultNamespace, defaultSeparator, key)
}