DynamoDB Perl 抽象

Question

我最近了解了 Amazon 的新数据库产品 DynamoDB，并且必须承认它听起来非常引人注目。然而，在我跑掉并开始重新编程我的模型层以利用块上的新孩子之前，我需要一些更多的细节。有谁知道抽象 DynamoDB 的 Perl 包还是太早了？我将其称为“ORM”包，但在 DynamoDB 世界中没有任何关系。 alpha，beta中是否有一个？如何通过 Perl 访问亚马逊的 dynamodb？

谢谢

Answer 1

您也可以使用我的 perl 模块 Net::Amazon::DynamoDB（@MadHacker：我冒昧地修改了您上面的签名代码）。

• CPAN：http://search.cpan.org/search?query=net%3A%3Aamazon%3A%3Adynamodb
• github 上的最新消息：https://github.com/ukautz/Net-Amazon-DynamoDB

Answer 2

我用 JavaScript 为 DynamoDB 编写了接口 我也是 Perl 程序员 请查看提供的示例，它与 Perl 非常相似

See example and download link here

Answer 3

这是一个使用 perl 的例子

#!/usr/bin/perl

use strict;
use warnings;

use Data::Dumper;
use Net::Amazon::AWSSign;
use XML::XPath;
use XML::XPath::XMLParser;

use LWP::UserAgent;

use HTTP::Request::Common;
use DateTime::Format::HTTP;
use Digest::SHA qw(sha256 hmac_sha256_base64);
use URI::Escape;

my $iam_key_id = 'Your AWS Access Key';
my $iam_secret = 'Your Security tocken';

my $url = "https://sts.amazonaws.com/?" .
"Action=GetSessionToken" .
"&Version=2011-06-15";

my $awsSign = new Net::Amazon::AWSSign("$iam_key_id", "$iam_secret"); # New object
my $awsSignedRESTURI = $awsSign->addRESTSecret($url); # Returns signed REST query URI for lwp-get, curl, etc.

my $response = `curl -s "$awsSignedRESTURI"`;
print Dumper($response);

my $xp = XML::XPath->new(xml => $response);
$xp->set_namespace('xx','https://sts.amazonaws.com/doc/2011-06-15/');   
my $sessionToken = $xp->getNodeText('/xx:GetSessionTokenResponse/GetSessionTokenResult/Credentials/SessionToken');
my $accessKeyId = $xp->getNodeText('/xx:GetSessionTokenResponse/GetSessionTokenResult/Credentials/AccessKeyId');
my $secretAccessKey = $xp->getNodeText('/xx:GetSessionTokenResponse/GetSessionTokenResult/Credentials/SecretAccessKey');
print $sessionToken . "\n";

#   SESSION TOKEN RECEIVED

put('{"TableName":"Test","Item":{"Id":{"S":"1"},"name":{"S":"somedata"}}}');
print "-----------------------------\n";
get('{"TableName":"Test","Key":{"HashKeyElement":{"S":"1"}}}');

exit;


sub get
{
  my ($json) = @_;

  perform('GetItem', $json);
}

sub put
{
  my ($json) = @_;

  perform('PutItem', $json);
}

sub perform
{
  my ($target, $json) = @_;

  my $class = 'DateTime::Format::HTTP';
  my $date = $class->format_datetime(DateTime->now);

  my $tosign =
    "POST\n" .
    "/\n" .
    "\n" .
    "host:dynamodb.us-east-1.amazonaws.com\n" .
    "x-amz-date:$date\n" .
    "x-amz-security-token:" . $sessionToken . "\n" .
    "x-amz-target:DynamoDB_20111205.$target\n" .
    "\n" .
    $json;

  my $b64 = hmac_sha256_base64(sha256($tosign), $secretAccessKey);
  while (length($b64) % 4) {$b64 .= '=';}

  ##Dynamo request
  my $string =
    "POST http://dynamodb.us-east-1.amazonaws.com/ HTTP/1.1\n" .
    "host: dynamodb.us-east-1.amazonaws.com\n" .
    "x-amz-date: $date\n" .
    "x-amzn-authorization: AWS3 AWSAccessKeyId=" . $accessKeyId . ",Algorithm=HmacSHA256,SignedHeaders=host;x-amz-date;x-amz-security-token;x-amz-target,Signature=$b64\n" .
    "x-amz-target: DynamoDB_20111205.$target\n" .
    "x-amz-security-token: " . $sessionToken . "\n" .
    "content-type: application/x-amz-json-1.0\n" .
    "connection: Keep-Alive\n" .
    "user-agent: perl\n" .
    "\n" .
    $json;

  my $req = HTTP::Request->parse($string);

  my $ua  = LWP::UserAgent->new;

  print Dumper($ua->request($req));
}