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delete.go
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delete.go
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// 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 sdb
import (
"fmt"
"github.com/jacobsa/aws/sdb/conn"
"sort"
)
type batchDeletePair struct {
Item ItemName
Updates []DeleteUpdate
}
type batchDeletePairList []batchDeletePair
func (l batchDeletePairList) Len() int { return len(l) }
func (l batchDeletePairList) Less(i, j int) bool { return l[i].Item < l[j].Item }
func (l batchDeletePairList) Swap(i, j int) { l[j], l[i] = l[i], l[j] }
// Return the elements of the map sorted by item name.
func getSortedDeletePairs(deleteMap BatchDeleteMap) batchDeletePairList {
res := batchDeletePairList{}
for item, updates := range deleteMap {
res = append(res, batchDeletePair{item, updates})
}
sort.Sort(res)
return res
}
func validateDeleteUpdate(u DeleteUpdate) (err error) {
// Make sure the attribute name is legal.
if u.Name == "" {
return fmt.Errorf("Invalid attribute name; names must be non-empty.")
}
if err = validateValue(string(u.Name)); err != nil {
return fmt.Errorf("Invalid attribute name: %v", err)
}
// Make sure the attribute value is legal, if it is specified.
if u.Value != nil {
if err = validateValue(string(*u.Value)); err != nil {
return fmt.Errorf("Invalid attribute value: %v", err)
}
}
return nil
}
func validateDeleteUpdates(updates []DeleteUpdate) (err error) {
numUpdates := len(updates)
if numUpdates > 256 {
return fmt.Errorf("Illegal number of updates: %d", numUpdates)
}
for _, u := range updates {
if err = validateDeleteUpdate(u); err != nil {
return fmt.Errorf("Invalid update (%v): %v", err, u)
}
}
return nil
}
func (d *domain) DeleteAttributes(
item ItemName,
deletes []DeleteUpdate,
precondition *Precondition) (err error) {
// Make sure the item name is legal.
if item == "" {
return fmt.Errorf("Invalid item name; names must be non-empty.")
}
if err = validateValue(string(item)); err != nil {
return fmt.Errorf("Invalid item name: %v", err)
}
// Validate deletes.
if err = validateDeleteUpdates(deletes); err != nil {
return err
}
// Validate the precondition, if any.
if precondition != nil {
if err = validatePrecondition(*precondition); err != nil {
return fmt.Errorf("Invalid precondition (%v): %v", err, *precondition)
}
}
// Assemble an appropriate request.
req := conn.Request{
"Action": "DeleteAttributes",
"Version": apiVersion,
"DomainName": d.name,
"ItemName": string(item),
}
for i, u := range deletes {
keyPrefix := fmt.Sprintf("Attribute.%d.", i+1)
req[keyPrefix+"Name"] = u.Name
if u.Value != nil {
req[keyPrefix+"Value"] = *u.Value
}
}
if precondition != nil {
keyPrefix := "Expected.1."
req[keyPrefix+"Name"] = precondition.Name
if precondition.Value != nil {
req[keyPrefix+"Value"] = *precondition.Value
} else {
req[keyPrefix+"Exists"] = "false"
}
}
// Call the connection.
if _, err = d.c.SendRequest(req); err != nil {
return fmt.Errorf("SendRequest: %v", err)
}
return nil
}
func (d *domain) BatchDeleteAttributes(
deleteMap BatchDeleteMap) (err error) {
// Make sure the size of the request is legal.
numItems := len(deleteMap)
if numItems == 0 || numItems > 25 {
return fmt.Errorf("Illegal number of items: %d", numItems)
}
// Make sure each item name and set of updates is legal.
for item, updates := range deleteMap {
if item == "" {
return fmt.Errorf("Invalid item name; names must be non-empty.")
}
if err = validateValue(string(item)); err != nil {
return fmt.Errorf("Invalid item name: %v", err)
}
if err = validateDeleteUpdates(updates); err != nil {
return fmt.Errorf("Updates for item %s: %v", item, err)
}
}
// Build a request.
req := conn.Request{
"Action": "BatchDeleteAttributes",
"Version": apiVersion,
"DomainName": d.name,
}
pairs := getSortedDeletePairs(deleteMap)
for i, pair := range pairs {
itemPrefix := fmt.Sprintf("Item.%d.", i+1)
req[itemPrefix+"ItemName"] = string(pair.Item)
for j, u := range pair.Updates {
updatePrefix := fmt.Sprintf("%sAttribute.%d.", itemPrefix, j+1)
req[updatePrefix+"Name"] = u.Name
if u.Value != nil {
req[updatePrefix+"Value"] = *u.Value
}
}
}
// Call the connection.
if _, err = d.c.SendRequest(req); err != nil {
return fmt.Errorf("SendRequest: %v", err)
}
return nil
}