Lua

DynamoDB - DescribeTable

See more Amazon DynamoDB Examples

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. Lua

local chilkat = require("chilkat")

local rest = chilkat.Rest.new()

-- 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

local authAws = chilkat.AuthAws.new()
authAws.access_key = "AWS_ACCESS_KEY"
authAws.secret_key = "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.region = "us-west-2"
authAws.service_name = "dynamodb"
-- SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
rest:set_auth_aws(authAws)

-- URL: https://dynamodb.us-west-2.amazonaws.com/
local bTls = true
local port = 443
local bAutoReconnect = true
-- Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region.
local success = rest:connect("dynamodb.us-west-2.amazonaws.com", port, bTls, bAutoReconnect)
if not success then
    print("ConnectFailReason: " .. rest.connect_fail_reason)
    print(rest.last_error_text)
    return
end

-- 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"
-- }

local json = chilkat.JsonObject.new()
json:update_string("TableName", "Thread")

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

local sbRequestBody = chilkat.StringBuilder.new()
json:emit_sb(sbRequestBody)
local sbResponseBody = chilkat.StringBuilder.new()
success = rest:full_request_sb("POST", "/", sbRequestBody, sbResponseBody)
if not success then
    print(rest.last_error_text)
    return
end

local respStatusCode = rest.response_status_code
print("response status code = " .. respStatusCode)
if respStatusCode >= 400 then
    print("Response Status Code = " .. respStatusCode)
    print("Response Header:")
    print(rest.response_header)
    print("Response Body:")
    print(sbResponseBody:get_as_string())
    return
end

local jsonResponse = chilkat.JsonObject.new()
jsonResponse:load_sb(sbResponseBody)

jsonResponse.emit_compact = false
print(jsonResponse:emit())

-- 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

local AttributeName = ""
local AttributeType = ""
local KeyType = ""
local IndexArn = ""
local IndexName = ""
local IndexSizeBytes = 0
local ItemCount = 0
local ProjectionProjectionType = ""
local j = 0
local count_j = 0

local TableTableArn = jsonResponse:string_of("Table.TableArn")
local TableCreationDateTime = jsonResponse:string_of("Table.CreationDateTime")
local TableItemCount = jsonResponse:int_of("Table.ItemCount")
local TableProvisionedThroughputNumberOfDecreasesToday = jsonResponse:int_of("Table.ProvisionedThroughput.NumberOfDecreasesToday")
local TableProvisionedThroughputReadCapacityUnits = jsonResponse:int_of("Table.ProvisionedThroughput.ReadCapacityUnits")
local TableProvisionedThroughputWriteCapacityUnits = jsonResponse:int_of("Table.ProvisionedThroughput.WriteCapacityUnits")
local TableTableName = jsonResponse:string_of("Table.TableName")
local TableTableSizeBytes = jsonResponse:int_of("Table.TableSizeBytes")
local TableTableStatus = jsonResponse:string_of("Table.TableStatus")
local i = 0
local count_i = jsonResponse:size_of_array("Table.AttributeDefinitions")
while i < count_i do
    jsonResponse.i = i
    AttributeName = jsonResponse:string_of("Table.AttributeDefinitions[i].AttributeName")
    AttributeType = jsonResponse:string_of("Table.AttributeDefinitions[i].AttributeType")
    i = i + 1
end

i = 0
count_i = jsonResponse:size_of_array("Table.KeySchema")
while i < count_i do
    jsonResponse.i = i
    AttributeName = jsonResponse:string_of("Table.KeySchema[i].AttributeName")
    KeyType = jsonResponse:string_of("Table.KeySchema[i].KeyType")
    i = i + 1
end

i = 0
count_i = jsonResponse:size_of_array("Table.LocalSecondaryIndexes")
while i < count_i do
    jsonResponse.i = i
    IndexArn = jsonResponse:string_of("Table.LocalSecondaryIndexes[i].IndexArn")
    IndexName = jsonResponse:string_of("Table.LocalSecondaryIndexes[i].IndexName")
    IndexSizeBytes = jsonResponse:int_of("Table.LocalSecondaryIndexes[i].IndexSizeBytes")
    ItemCount = jsonResponse:int_of("Table.LocalSecondaryIndexes[i].ItemCount")
    ProjectionProjectionType = jsonResponse:string_of("Table.LocalSecondaryIndexes[i].Projection.ProjectionType")
    j = 0
    count_j = jsonResponse:size_of_array("Table.LocalSecondaryIndexes[i].KeySchema")
    while j < count_j do
        jsonResponse.j = j
        AttributeName = jsonResponse:string_of("Table.LocalSecondaryIndexes[i].KeySchema[j].AttributeName")
        KeyType = jsonResponse:string_of("Table.LocalSecondaryIndexes[i].KeySchema[j].KeyType")
        j = j + 1
    end

    i = i + 1
end