(C++) DynamoDB - DescribeTable

Returns information about the table, including the current status of the table, when it was created, the primary key schema, and any indexes on the table.

For more information, see https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DescribeTable.html

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#include <CkRest.h>
#include <CkAuthAws.h>
#include <CkJsonObject.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkRest rest;
    bool success;

    // Implements the following CURL command:

    // curl -X POST https://dynamodb.us-west-2.amazonaws.com/ \
    //   -H "Accept-Encoding: identity" \
    //   -H "Content-Type: application/x-amz-json-1.0" \
    //   -H "Authorization: AWS4-HMAC-SHA256 Credential=<Credential>, SignedHeaders=<Headers>, Signature=<Signature>" \
    //   -H "X-Amz-Date: <Date>" \
    //   -H "X-Amz-Target: DynamoDB_20120810.DescribeTable" \
    //   -d '{
    //     "TableName":"Thread"
    // }'

    // Use the following online tool to generate REST code from a CURL command
    // Convert a cURL Command to REST Source Code

    CkAuthAws authAws;
    authAws.put_AccessKey("AWS_ACCESS_KEY");
    authAws.put_SecretKey("AWS_SECRET_KEY");
    // Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
    authAws.put_Region("us-west-2");
    authAws.put_ServiceName("dynamodb");
    // SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
    rest.SetAuthAws(authAws);

    // URL: https://dynamodb.us-west-2.amazonaws.com/
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    // Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region.
    success = rest.Connect("dynamodb.us-west-2.amazonaws.com",port,bTls,bAutoReconnect);
    if (success != true) {
        std::cout << "ConnectFailReason: " << rest.get_ConnectFailReason() << "\r\n";
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Note: The above code does not need to be repeatedly called for each REST request.
    // The rest object can be setup once, and then many requests can be sent.  Chilkat will automatically
    // reconnect within a FullRequest* method as needed.  It is only the very first connection that is explicitly
    // made via the Connect method.

    // Use this online tool to generate code from sample JSON:
    // Generate Code to Create JSON

    // The following JSON is sent in the request body.

    // {
    //   "TableName": "Thread"
    // }

    CkJsonObject json;
    json.UpdateString("TableName","Thread");

    rest.AddHeader("Content-Type","application/x-amz-json-1.0");
    rest.AddHeader("X-Amz-Target","DynamoDB_20120810.DescribeTable");
    rest.AddHeader("Accept-Encoding","identity");

    CkStringBuilder sbRequestBody;
    json.EmitSb(sbRequestBody);
    CkStringBuilder sbResponseBody;
    success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    int respStatusCode = rest.get_ResponseStatusCode();
    std::cout << "response status code = " << respStatusCode << "\r\n";
    if (respStatusCode >= 400) {
        std::cout << "Response Status Code = " << respStatusCode << "\r\n";
        std::cout << "Response Header:" << "\r\n";
        std::cout << rest.responseHeader() << "\r\n";
        std::cout << "Response Body:" << "\r\n";
        std::cout << sbResponseBody.getAsString() << "\r\n";
        return;
    }

    CkJsonObject jsonResponse;
    jsonResponse.LoadSb(sbResponseBody);

    jsonResponse.put_EmitCompact(false);
    std::cout << jsonResponse.emit() << "\r\n";

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "Table": {
    //     "TableArn": "arn:aws:dynamodb:us-west-2:123456789012:table/Thread",
    //     "AttributeDefinitions": [
    //       {
    //         "AttributeName": "ForumName",
    //         "AttributeType": "S"
    //       },
    //       {
    //         "AttributeName": "LastPostDateTime",
    //         "AttributeType": "S"
    //       },
    //       {
    //         "AttributeName": "Subject",
    //         "AttributeType": "S"
    //       }
    //     ],
    //     "CreationDateTime": 1.363729002358E9,
    //     "ItemCount": 0,
    //     "KeySchema": [
    //       {
    //         "AttributeName": "ForumName",
    //         "KeyType": "HASH"
    //       },
    //       {
    //         "AttributeName": "Subject",
    //         "KeyType": "RANGE"
    //       }
    //     ],
    //     "LocalSecondaryIndexes": [
    //       {
    //         "IndexArn": "arn:aws:dynamodb:us-west-2:123456789012:table/Thread/index/LastPostIndex",
    //         "IndexName": "LastPostIndex",
    //         "IndexSizeBytes": 0,
    //         "ItemCount": 0,
    //         "KeySchema": [
    //           {
    //             "AttributeName": "ForumName",
    //             "KeyType": "HASH"
    //           },
    //           {
    //             "AttributeName": "LastPostDateTime",
    //             "KeyType": "RANGE"
    //           }
    //         ],
    //         "Projection": {
    //           "ProjectionType": "KEYS_ONLY"
    //         }
    //       }
    //     ],
    //     "ProvisionedThroughput": {
    //       "NumberOfDecreasesToday": 0,
    //       "ReadCapacityUnits": 5,
    //       "WriteCapacityUnits": 5
    //     },
    //     "TableName": "Thread",
    //     "TableSizeBytes": 0,
    //     "TableStatus": "ACTIVE"
    //   }
    // }

    // Sample code for parsing the JSON response...
    // Use the following online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    const char *AttributeName = 0;
    const char *AttributeType = 0;
    const char *KeyType = 0;
    const char *IndexArn = 0;
    const char *IndexName = 0;
    int IndexSizeBytes;
    int ItemCount;
    const char *ProjectionProjectionType = 0;
    int j;
    int count_j;

    const char *TableTableArn = jsonResponse.stringOf("Table.TableArn");
    const char *TableCreationDateTime = jsonResponse.stringOf("Table.CreationDateTime");
    int TableItemCount = jsonResponse.IntOf("Table.ItemCount");
    int TableProvisionedThroughputNumberOfDecreasesToday = jsonResponse.IntOf("Table.ProvisionedThroughput.NumberOfDecreasesToday");
    int TableProvisionedThroughputReadCapacityUnits = jsonResponse.IntOf("Table.ProvisionedThroughput.ReadCapacityUnits");
    int TableProvisionedThroughputWriteCapacityUnits = jsonResponse.IntOf("Table.ProvisionedThroughput.WriteCapacityUnits");
    const char *TableTableName = jsonResponse.stringOf("Table.TableName");
    int TableTableSizeBytes = jsonResponse.IntOf("Table.TableSizeBytes");
    const char *TableTableStatus = jsonResponse.stringOf("Table.TableStatus");
    int i = 0;
    int count_i = jsonResponse.SizeOfArray("Table.AttributeDefinitions");
    while (i < count_i) {
        jsonResponse.put_I(i);
        AttributeName = jsonResponse.stringOf("Table.AttributeDefinitions[i].AttributeName");
        AttributeType = jsonResponse.stringOf("Table.AttributeDefinitions[i].AttributeType");
        i = i + 1;
    }

    i = 0;
    count_i = jsonResponse.SizeOfArray("Table.KeySchema");
    while (i < count_i) {
        jsonResponse.put_I(i);
        AttributeName = jsonResponse.stringOf("Table.KeySchema[i].AttributeName");
        KeyType = jsonResponse.stringOf("Table.KeySchema[i].KeyType");
        i = i + 1;
    }

    i = 0;
    count_i = jsonResponse.SizeOfArray("Table.LocalSecondaryIndexes");
    while (i < count_i) {
        jsonResponse.put_I(i);
        IndexArn = jsonResponse.stringOf("Table.LocalSecondaryIndexes[i].IndexArn");
        IndexName = jsonResponse.stringOf("Table.LocalSecondaryIndexes[i].IndexName");
        IndexSizeBytes = jsonResponse.IntOf("Table.LocalSecondaryIndexes[i].IndexSizeBytes");
        ItemCount = jsonResponse.IntOf("Table.LocalSecondaryIndexes[i].ItemCount");
        ProjectionProjectionType = jsonResponse.stringOf("Table.LocalSecondaryIndexes[i].Projection.ProjectionType");
        j = 0;
        count_j = jsonResponse.SizeOfArray("Table.LocalSecondaryIndexes[i].KeySchema");
        while (j < count_j) {
            jsonResponse.put_J(j);
            AttributeName = jsonResponse.stringOf("Table.LocalSecondaryIndexes[i].KeySchema[j].AttributeName");
            KeyType = jsonResponse.stringOf("Table.LocalSecondaryIndexes[i].KeySchema[j].KeyType");
            j = j + 1;
        }

        i = i + 1;
    }
    }