Chilkat Examples

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Tcl Web API Examples

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(Tcl) 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

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set rest [new_CkRest]

# 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

set authAws [new_CkAuthAws]

CkAuthAws_put_AccessKey $authAws "AWS_ACCESS_KEY"
CkAuthAws_put_SecretKey $authAws "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.)
CkAuthAws_put_Region $authAws "us-west-2"
CkAuthAws_put_ServiceName $authAws "dynamodb"
# SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
CkRest_SetAuthAws $rest $authAws

# URL: https://dynamodb.us-west-2.amazonaws.com/
set bTls 1
set port 443
set bAutoReconnect 1
# Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region.
set success [CkRest_Connect $rest "dynamodb.us-west-2.amazonaws.com" $port $bTls $bAutoReconnect]
if {$success != 1} then {
    puts "ConnectFailReason: [CkRest_get_ConnectFailReason $rest]"
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkAuthAws $authAws
    exit
}

# 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"
# }

set json [new_CkJsonObject]

CkJsonObject_UpdateString $json "TableName" "Thread"

CkRest_AddHeader $rest "Content-Type" "application/x-amz-json-1.0"
CkRest_AddHeader $rest "X-Amz-Target" "DynamoDB_20120810.DescribeTable"
CkRest_AddHeader $rest "Accept-Encoding" "identity"

set sbRequestBody [new_CkStringBuilder]

CkJsonObject_EmitSb $json $sbRequestBody
set sbResponseBody [new_CkStringBuilder]

set success [CkRest_FullRequestSb $rest "POST" "/" $sbRequestBody $sbResponseBody]
if {$success != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkAuthAws $authAws
    delete_CkJsonObject $json
    delete_CkStringBuilder $sbRequestBody
    delete_CkStringBuilder $sbResponseBody
    exit
}

set respStatusCode [CkRest_get_ResponseStatusCode $rest]
puts "response status code = $respStatusCode"
if {$respStatusCode >= 400} then {
    puts "Response Status Code = $respStatusCode"
    puts "Response Header:"
    puts [CkRest_responseHeader $rest]
    puts "Response Body:"
    puts [CkStringBuilder_getAsString $sbResponseBody]
    delete_CkRest $rest
    delete_CkAuthAws $authAws
    delete_CkJsonObject $json
    delete_CkStringBuilder $sbRequestBody
    delete_CkStringBuilder $sbResponseBody
    exit
}

set jsonResponse [new_CkJsonObject]

CkJsonObject_LoadSb $jsonResponse $sbResponseBody

CkJsonObject_put_EmitCompact $jsonResponse 0
puts [CkJsonObject_emit $jsonResponse]

# 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

set TableTableArn [CkJsonObject_stringOf $jsonResponse "Table.TableArn"]
set TableCreationDateTime [CkJsonObject_stringOf $jsonResponse "Table.CreationDateTime"]
set TableItemCount [CkJsonObject_IntOf $jsonResponse "Table.ItemCount"]
set TableProvisionedThroughputNumberOfDecreasesToday [CkJsonObject_IntOf $jsonResponse "Table.ProvisionedThroughput.NumberOfDecreasesToday"]
set TableProvisionedThroughputReadCapacityUnits [CkJsonObject_IntOf $jsonResponse "Table.ProvisionedThroughput.ReadCapacityUnits"]
set TableProvisionedThroughputWriteCapacityUnits [CkJsonObject_IntOf $jsonResponse "Table.ProvisionedThroughput.WriteCapacityUnits"]
set TableTableName [CkJsonObject_stringOf $jsonResponse "Table.TableName"]
set TableTableSizeBytes [CkJsonObject_IntOf $jsonResponse "Table.TableSizeBytes"]
set TableTableStatus [CkJsonObject_stringOf $jsonResponse "Table.TableStatus"]
set i 0
set count_i [CkJsonObject_SizeOfArray $jsonResponse "Table.AttributeDefinitions"]
while {$i < $count_i} {
    CkJsonObject_put_I $jsonResponse $i
    set AttributeName [CkJsonObject_stringOf $jsonResponse "Table.AttributeDefinitions[i].AttributeName"]
    set AttributeType [CkJsonObject_stringOf $jsonResponse "Table.AttributeDefinitions[i].AttributeType"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $jsonResponse "Table.KeySchema"]
while {$i < $count_i} {
    CkJsonObject_put_I $jsonResponse $i
    set AttributeName [CkJsonObject_stringOf $jsonResponse "Table.KeySchema[i].AttributeName"]
    set KeyType [CkJsonObject_stringOf $jsonResponse "Table.KeySchema[i].KeyType"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $jsonResponse "Table.LocalSecondaryIndexes"]
while {$i < $count_i} {
    CkJsonObject_put_I $jsonResponse $i
    set IndexArn [CkJsonObject_stringOf $jsonResponse "Table.LocalSecondaryIndexes[i].IndexArn"]
    set IndexName [CkJsonObject_stringOf $jsonResponse "Table.LocalSecondaryIndexes[i].IndexName"]
    set IndexSizeBytes [CkJsonObject_IntOf $jsonResponse "Table.LocalSecondaryIndexes[i].IndexSizeBytes"]
    set ItemCount [CkJsonObject_IntOf $jsonResponse "Table.LocalSecondaryIndexes[i].ItemCount"]
    set ProjectionProjectionType [CkJsonObject_stringOf $jsonResponse "Table.LocalSecondaryIndexes[i].Projection.ProjectionType"]
    set j 0
    set count_j [CkJsonObject_SizeOfArray $jsonResponse "Table.LocalSecondaryIndexes[i].KeySchema"]
    while {$j < $count_j} {
        CkJsonObject_put_J $jsonResponse $j
        set AttributeName [CkJsonObject_stringOf $jsonResponse "Table.LocalSecondaryIndexes[i].KeySchema[j].AttributeName"]
        set KeyType [CkJsonObject_stringOf $jsonResponse "Table.LocalSecondaryIndexes[i].KeySchema[j].KeyType"]
        set j [expr $j + 1]
    }
    set i [expr $i + 1]
}

delete_CkRest $rest
delete_CkAuthAws $authAws
delete_CkJsonObject $json
delete_CkStringBuilder $sbRequestBody
delete_CkStringBuilder $sbResponseBody
delete_CkJsonObject $jsonResponse

 

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