{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
{-# LANGUAGE OverloadedStrings  #-}
{-# LANGUAGE RecordWildCards    #-}
{-# LANGUAGE TypeFamilies       #-}

{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-binds   #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Network.AWS.Lambda.CreateEventSourceMapping
-- Copyright   : (c) 2013-2016 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay <brendan.g.hay@gmail.com>
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Identifies a stream as an event source for a Lambda function. It can be
-- either an Amazon Kinesis stream or an Amazon DynamoDB stream. AWS Lambda
-- invokes the specified function when records are posted to the stream.
--
-- This association between a stream source and a Lambda function is called
-- the event source mapping.
--
-- This event source mapping is relevant only in the AWS Lambda pull model,
-- where AWS Lambda invokes the function. For more information, go to
-- <http://docs.aws.amazon.com/lambda/latest/dg/lambda-introduction.html AWS Lambda: How it Works>
-- in the /AWS Lambda Developer Guide/.
--
-- You provide mapping information (for example, which stream to read from
-- and which Lambda function to invoke) in the request body.
--
-- Each event source, such as an Amazon Kinesis or a DynamoDB stream, can
-- be associated with multiple AWS Lambda function. A given Lambda function
-- can be associated with multiple AWS event sources.
--
-- If you are using versioning, you can specify a specific function version
-- or an alias via the function name parameter. For more information about
-- versioning, see
-- <http://docs.aws.amazon.com/lambda/latest/dg/versioning-aliases.html AWS Lambda Function Versioning and Aliases>.
--
-- This operation requires permission for the
-- 'lambda:CreateEventSourceMapping' action.
module Network.AWS.Lambda.CreateEventSourceMapping
    (
    -- * Creating a Request
      createEventSourceMapping
    , CreateEventSourceMapping
    -- * Request Lenses
    , cesmEnabled
    , cesmBatchSize
    , cesmEventSourceARN
    , cesmFunctionName
    , cesmStartingPosition

    -- * Destructuring the Response
    , eventSourceMappingConfiguration
    , EventSourceMappingConfiguration
    -- * Response Lenses
    , esmcEventSourceARN
    , esmcState
    , esmcFunctionARN
    , esmcUUId
    , esmcLastProcessingResult
    , esmcBatchSize
    , esmcStateTransitionReason
    , esmcLastModified
    ) where

import           Network.AWS.Lambda.Types
import           Network.AWS.Lambda.Types.Product
import           Network.AWS.Lens
import           Network.AWS.Prelude
import           Network.AWS.Request
import           Network.AWS.Response

-- | /See:/ 'createEventSourceMapping' smart constructor.
data CreateEventSourceMapping = CreateEventSourceMapping'
    { _cesmEnabled          :: !(Maybe Bool)
    , _cesmBatchSize        :: !(Maybe Nat)
    , _cesmEventSourceARN   :: !Text
    , _cesmFunctionName     :: !Text
    , _cesmStartingPosition :: !EventSourcePosition
    } deriving (Eq,Read,Show,Data,Typeable,Generic)

-- | Creates a value of 'CreateEventSourceMapping' with the minimum fields required to make a request.
--
-- Use one of the following lenses to modify other fields as desired:
--
-- * 'cesmEnabled'
--
-- * 'cesmBatchSize'
--
-- * 'cesmEventSourceARN'
--
-- * 'cesmFunctionName'
--
-- * 'cesmStartingPosition'
createEventSourceMapping
    :: Text -- ^ 'cesmEventSourceARN'
    -> Text -- ^ 'cesmFunctionName'
    -> EventSourcePosition -- ^ 'cesmStartingPosition'
    -> CreateEventSourceMapping
createEventSourceMapping pEventSourceARN_ pFunctionName_ pStartingPosition_ =
    CreateEventSourceMapping'
    { _cesmEnabled = Nothing
    , _cesmBatchSize = Nothing
    , _cesmEventSourceARN = pEventSourceARN_
    , _cesmFunctionName = pFunctionName_
    , _cesmStartingPosition = pStartingPosition_
    }

-- | Indicates whether AWS Lambda should begin polling the event source. By
-- default, 'Enabled' is true.
cesmEnabled :: Lens' CreateEventSourceMapping (Maybe Bool)
cesmEnabled = lens _cesmEnabled (\ s a -> s{_cesmEnabled = a});

-- | The largest number of records that AWS Lambda will retrieve from your
-- event source at the time of invoking your function. Your function
-- receives an event with all the retrieved records. The default is 100
-- records.
cesmBatchSize :: Lens' CreateEventSourceMapping (Maybe Natural)
cesmBatchSize = lens _cesmBatchSize (\ s a -> s{_cesmBatchSize = a}) . mapping _Nat;

-- | The Amazon Resource Name (ARN) of the Amazon Kinesis or the Amazon
-- DynamoDB stream that is the event source. Any record added to this
-- stream could cause AWS Lambda to invoke your Lambda function, it depends
-- on the 'BatchSize'. AWS Lambda POSTs the Amazon Kinesis event,
-- containing records, to your Lambda function as JSON.
cesmEventSourceARN :: Lens' CreateEventSourceMapping Text
cesmEventSourceARN = lens _cesmEventSourceARN (\ s a -> s{_cesmEventSourceARN = a});

-- | The Lambda function to invoke when AWS Lambda detects an event on the
-- stream.
--
-- You can specify the function name (for example, 'Thumbnail') or you can
-- specify Amazon Resource Name (ARN) of the function (for example,
-- 'arn:aws:lambda:us-west-2:account-id:function:ThumbNail').
--
-- If you are using versioning, you can also provide a qualified function
-- ARN (ARN that is qualified with function version or alias name as
-- suffix). For more information about versioning, see
-- <http://docs.aws.amazon.com/lambda/latest/dg/versioning-aliases.html AWS Lambda Function Versioning and Aliases>
--
-- AWS Lambda also allows you to specify only the function name with the
-- account ID qualifier (for example, 'account-id:Thumbnail').
--
-- Note that the length constraint applies only to the ARN. If you specify
-- only the function name, it is limited to 64 character in length.
cesmFunctionName :: Lens' CreateEventSourceMapping Text
cesmFunctionName = lens _cesmFunctionName (\ s a -> s{_cesmFunctionName = a});

-- | The position in the stream where AWS Lambda should start reading. For
-- more information, go to
-- <http://docs.aws.amazon.com/kinesis/latest/APIReference/API_GetShardIterator.html#Kinesis-GetShardIterator-request-ShardIteratorType ShardIteratorType>
-- in the /Amazon Kinesis API Reference/.
cesmStartingPosition :: Lens' CreateEventSourceMapping EventSourcePosition
cesmStartingPosition = lens _cesmStartingPosition (\ s a -> s{_cesmStartingPosition = a});

instance AWSRequest CreateEventSourceMapping where
        type Rs CreateEventSourceMapping =
             EventSourceMappingConfiguration
        request = postJSON lambda
        response = receiveJSON (\ s h x -> eitherParseJSON x)

instance Hashable CreateEventSourceMapping

instance NFData CreateEventSourceMapping

instance ToHeaders CreateEventSourceMapping where
        toHeaders = const mempty

instance ToJSON CreateEventSourceMapping where
        toJSON CreateEventSourceMapping'{..}
          = object
              (catMaybes
                 [("Enabled" .=) <$> _cesmEnabled,
                  ("BatchSize" .=) <$> _cesmBatchSize,
                  Just ("EventSourceArn" .= _cesmEventSourceARN),
                  Just ("FunctionName" .= _cesmFunctionName),
                  Just ("StartingPosition" .= _cesmStartingPosition)])

instance ToPath CreateEventSourceMapping where
        toPath = const "/2015-03-31/event-source-mappings/"

instance ToQuery CreateEventSourceMapping where
        toQuery = const mempty