Amazon Web Services Cloud Computing in Delphi

What is cloud computing?
"Cloud Computing"refers to the on-demand delivery of IT resources and applications via the Internet with pay-as-you-go pricing. You can think of the cloud services as a large scale, publicly accessible collection of compute, storage and networking resources. These are allocated via web service calls using HTTP protocol. In other words it is a „programmable data center” that your applications can integrate with. Cloud Computing providers such as Amazon Web Services own and maintain data centers across the globe with the network-connected hardware required for these application services, while you provision and use only what you need. 

Cloud Computing in Delphi
RAD Studio provides Cloud components, which allow you to easily use cloud services from Amazon and Microsoft Azure. RAD Studio provides a framework that allows you to build cloud services and easily connect to your back-end services and databases. With the RAD Studio RAD Cloud deployment, you can move your data and services to the Cloud, making your applications accessible from virtually any platform or device from anywhere in the world.


What is Cloud API provided in Delphi?
Cloud API is the collection of classes that let you integrate your Delphi or C++Builder apps with cloud services like Micorosoft Azure and Amazon Web Services. Contains useful classes that are common across multiple APIs, such as TCloudResponseInfo and TCloudTableRow. Contains the TCloudService class, which is the base service class which the Amazon and Azure API service classes extend.

Difference between AWS and Azure


Accessing Amazon Web Services with Cloud API
The very first thing in order to start working with cloud services is to create an account. In case of Amazon Web Services you can do it easily at http://aws.amazon.com. There is something called a "Free Tier" where you can experiment with certain services for free for the first year. In order to access AWS securely you should also have a look at "Identity and Access Management" service (http://aws.amazon.com/iam).

Simple Storage Service (S3)
Simple Database Service (SimpleDB)
Simple Queue Service (SQS)


How Amazon Web Services work ?

Set up and log into your AWS account
To use Amazon S3, you need an AWS account. If you don't already have one, you'll be prompted to create one when you sign up for Amazon S3. You will not be charged for Amazon S3 until you use it.










Create a bucket
Every object in Amazon S3 is stored in a bucket. Before you can store data in Amazon S3, you must create a bucket.


Start Building with AWS
Now that you've created a bucket, you're ready to add an object to it. An object can be any kind of file: a text file, a photo, a video, and so on. Read the Getting Started Guideto learn more and start building.

Buckets

Keys
Values

Accessing Amazon Web Service in Delphi using Delphi Cloud API
The AmazonAPI unit is completely new to RAD Studio. It includes support for the Amazon Simple Queue Service (SQS), Amazon Simple Storage Service (S3) and Amazon SimpleDB service. These are very similar to their comparable services offered by Amazon. Amazon API has functions that will do the XML parsing for you, unless you want to implement that yourself. The service classes are: 
TAmazonTableService, TAmazonQueueService, TAmazonStorageService. The designer component for creating a connection info instance is TAmazonConnectionInfo.

The class hierarchy for Cloud Services in Delphi Tokyo:

TCloudServiceTAmazonService
          TAmazonStorageService
                   TAmazonBasicService
                             TAmazonTableService
                                      TAmazonQueueService

Cloud Components in Delphi
On the "Cloud" tab you can find "TAmazonConnectionInfo" component that you use to enter your access credentials. In order to access specific functionality of any of the Amazon web services you need to instantiate one of the Cloud API classes that represent a given service passing to a constructor a reference to your TAmazonConnectionInfo component. "CloudAPITest" demo that comes with installation of RAD Studio 10 "Seattle" and illustrates calling all supported methods on these classes.


Connecting to Amazon Web Services (AWS) Account
We can use the TAmazonConnectionInfo component to connect to your Amazon Web Services (AWS) account. Drop the component on the form and enter your account information in the corresponding properties in the Object Inspector:

AccountKey: The Secret Access Key.
AccountName: The Access Key ID.

Access Keys (Access Key ID and Secret Access Key)
Access keys consist of two parts: an access key ID (for example, AKIAIOSFODNN7EXAMPLE) and a secret access key (for example, wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY). You use access keys to sign programmatic requests that you make to AWS if you use AWS CLI commands (using the SDKs) or using AWS API operations. Like a user name and password, you must use both the access key ID and secret access key together to authenticate your requests. Manage your access keys as securely as you do your user name and password. When you create access keys, you create the access key ID and secret access key as a set. During access key creation, AWS gives you one opportunity to view and download the secret access key part of the access key. If you don't download it or if you lose it, you can delete the access key and then create a new one. And never share the Access key to any one if you do so then that person have full access to your account.

Alternatively, we can create an instance of TAmazonConnectionInfo pro-grammatically in Delphi:

var
 ConAmazon:TAmazonConnectionInfo ;
….
 ConAmazon:= TAmazonConnectionInfo.Create(nil);
 ConAmazon.AccountName := 'AKIAJ32REXDJHV2X4JSQ';
 ConAmazon.AccountKey := 'uW3f0fucxqotP/UXQAv/xhiaGt8UAAhHcYDaqxmW';

Using the Amazon Web Services (AWS)
The classes that implement support for the corresponding Amazon Web Services are:

TAmazonQueueService: Allows you to connect to the Amazon Simple Queue Service (SQS).

TAmazonTableService: Allows you to connect to the Amazon SimpleDB service.

TAmazonStorageService: Allows you to connect to the Amazon Simple Storage Service (S3) service.

Here I have created examples with using TamazonStorageService to Upload and Download object to and from Bucket of AWS.
Example…

Upload a Text

procedure UploadText();
var
    ConAmazon: TAmazonConnectionInfo; 
    Service: TAmazonStorageService;
    Response: TCloudResponseInfo;
    Text_Byte: TBytes;
    Text_Stream: TStringStream;
    bResult : Boolean;
begin
    try
       //load a string into Buffer of TBytes//
       Text_Stream:= TStringStream.Create(‘This is AWS S3 Demo’);
       Text_Byte := Text_Stream.Bytes;
       //now create AWS connection and storage object to upload data//
       ConAmazon := TAmazonConnectionInfo.Create(nil);
       ConAmazon.AccountKey := '******Secrect-awsACkey**********';
       ConAmazon.AccountName := *****Secrect-awsACname******';
       Service := TAmazonStorageService.Create(ConAmazon);
       Response := TCloudResponseInfo.Create;
       bResult:= Service.UploadObject(jkgdelphitext72, ‘testtext72, Text_Byte, False, nil, nil, amzbaPrivate, Response);
       if bResult = True then
          ShowMessage('Upload success'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage)
       else
          ShowMessage('Upload fails'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage)
    Finally
       Text_Stream.Free;
       Service.Free;
       ConAmazon.Free;
    end;
end;

Download a Text

procedure DownloadText();
var
    ConAmazon: TAmazonConnectionInfo; 
    Service: TAmazonStorageService;
    Response: TCloudResponseInfo;
    Text_Stream: TStringStream;
    bResult : Boolean;
begin
    try
       //create a String stream with blank//
       Text_Stream:= TStringStream.Create;       
       //now create AWS connection and storage object to download data//
       ConAmazon := TAmazonConnectionInfo.Create(nil);
       ConAmazon.AccountKey := '******Secrect-awsACkey**********';
       ConAmazon.AccountName := *****Secrect-awsACname******';
       Service := TAmazonStorageService.Create(ConAmazon);
       Response := TCloudResponseInfo.Create;
       bResult := Service_Storage.GetObject('jkgdelphitext72', 'testtext72', Text_Stream, Response);
       if bResult = True then
       begin
          memoText.Text := Text_Stream.DataString;
          ShowMessage(Download success'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage);
       end
       else
          ShowMessage(Download fails'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage)
    Finally
       Text_Stream.Free;
       Service.Free;
       ConAmazon.Free;
    end;
end;

Upload an Image File

procedure UploadImage();
var
    ConAmazon: TAmazonConnectionInfo; 
    Service: TAmazonStorageService;
    Response: TCloudResponseInfo;
    Image_Byte: TBytes;
    Image_Stream: TFileStream;
    bResult : Boolean;
begin
    try
       //load image into Buffer of TBytes//
       Image_Stream:= TFileStream.Create(‘C:\jitendra\testimage1.png’, 0);
       SetLength(Image_Byte, Image_Stream.Size);
       Image_Stream.Position := 0;
       Image_Stream.Read(Image_Byte, Image_Stream.Size );
       //now create AWS connection and storage object to upload data//
       ConAmazon := TAmazonConnectionInfo.Create(nil);
       ConAmazon.AccountKey := '******Secrect-awsACkey**********';
       ConAmazon.AccountName := *****Secrect-awsACname******';
       Service := TAmazonStorageService.Create(ConAmazon);
       Response := TCloudResponseInfo.Create;
       bResult:= Service.UploadObject('jkgdelphiimg72', ‘testimage72’, Image_Byte, False, nil, nil, amzbaPrivate, Response);
       if bResult = True then
          ShowMessage('Upload success'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage)
       else
          ShowMessage('Upload fails'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage)
    Finally
        Image_Stream.Free;
        Service.Free;
        ConAmazon.Free;
    end;
end;

Download an Image File

procedure DownloadImage();
var
    ConAmazon: TAmazonConnectionInfo; 
    Service: TAmazonStorageService;
    Response: TCloudResponseInfo;
    Image_Stream: TFileStream;
    bResult : Boolean;
begin
    try
       //create a file stream with blank buffer//
       Image_Stream:= TFileStream.Create(‘C:\jitendra\downloadmage1.png’, fmCreate);
       //now create AWS connection and storage object to upload data//
       ConAmazon := TAmazonConnectionInfo.Create(nil);
       ConAmazon.AccountKey := '******Secrect-awsACkey**********';
       ConAmazon.AccountName := *****Secrect-awsACname******';
       Service := TAmazonStorageService.Create(ConAmazon);
       Response := TCloudResponseInfo.Create;
       bResult := Service_Storage.GetObject('jkgdelphiimg72', 'testimage72', Image_Stream, Response);
       if bResult = True then
       begin
          Image1.Picture.LoadFromStream(Image_Stream);
          ShowMessage(Download success'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage);
       end
       else
          ShowMessage(Download fails'+#13+IntToStr(Response.StatusCode)+' -> ' + Response.StatusMessage)
    Finally
        Image_Stream.Free;
        Service.Free;
        ConAmazon.Free;
    end;
end;

procedure btnTextUpLoadClick(Sender: TObject);
begin
   UploadText;
end;

procedure btnImgUploadClick(Sender: TObject);
begin
   UploadImage;
end;

procedure btnTextDownloadClick(Sender: TObject);
begin
   DownloadText;
end;

procedure btnImgDownloadClick(Sender: TObject);
begin
   DownloadImage;
end;

procedure btnTextClearClick(Sender: TObject);
begin
  memoText.Clear;
end;

procedure btnImgClearClick(Sender: TObject);
begin
  Image1.Picture := Nil;

end;



Video Tutorial
Some other examples we can find in Delphi install folder…
C:\Users\Public\Documents\Embarcadero\Studio\19.0\Samples\Object Pascal\Database\CloudAPI

Deploy the Application to the Cloud
You can deploy the application to either Amazon EC2 using the Deployment Manager. The Deployment Manager replaces the formal Deploy to Cloud wizard (for Amazon EC2 infrastructure) shipped with RAD Studio. You can deploy your application to an Amazon EC2 server just as you would deploy to any other computer. Developers need to install the Platform Assistant on the EC2 server, then set up a local profile in RAD Studio with the machine name and port of the server. After that, developers will be able to deploy to the EC2 server. If the remote debugger is installed on the EC2 server, then it can be used to debug deployed applications.


To learn more about the Deployment Manager, go to http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Deployment_Manager

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