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get.go
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get.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 (
"encoding/xml"
"fmt"
"github.com/jacobsa/aws/sdb/conn"
)
type getAttributesResult struct {
Attributes []Attribute `xml:"Attribute"`
}
type getAttributesResponse struct {
GetAttributesResult getAttributesResult
}
func parseGetResponse(resp []byte) (attrs []Attribute, err error) {
responseStruct := &getAttributesResponse{}
if err = xml.Unmarshal(resp, responseStruct); err != nil {
err = fmt.Errorf("Invalid response from server (%v): %s", err, resp)
return
}
attrs = responseStruct.GetAttributesResult.Attributes
return
}
func (d *domain) GetAttributes(
item ItemName,
constistentRead bool,
attrNames []string) (attrs []Attribute, err error) {
// Make sure the item name is legal.
if item == "" {
err = fmt.Errorf("Invalid item name; names must be non-empty.")
return
}
if err = validateValue(string(item)); err != nil {
err = fmt.Errorf("Invalid item name: %v", err)
return
}
// Make sure attribute names are legal.
for _, name := range attrNames {
if name == "" {
err = fmt.Errorf("Invalid attribute name; names must be non-empty.")
return
}
if err = validateValue(name); err != nil {
err = fmt.Errorf("Invalid attribute name: %v", err)
return
}
}
// Create an appropriate request.
//
// Reference:
// http://goo.gl/MmaJA
req := conn.Request{
"Action": "GetAttributes",
"Version": apiVersion,
"DomainName": d.name,
"ItemName": string(item),
}
if constistentRead {
req["ConsistentRead"] = "true"
}
for i, name := range attrNames {
req[fmt.Sprintf("AttributeName.%d", i)] = name
}
// Call the connection.
resp, err := d.c.SendRequest(req)
if err != nil {
err = fmt.Errorf("SendRequest: %v", err)
return
}
return parseGetResponse(resp)
}