{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -fno-warn-unused-binds #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

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

-- |
-- Module      : Amazonka.Kinesis.DescribeStream
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Describes the specified Kinesis data stream.
--
-- This API has been revised. It\'s highly recommended that you use the
-- DescribeStreamSummary API to get a summarized description of the
-- specified Kinesis data stream and the ListShards API to list the shards
-- in a specified data stream and obtain information about each shard.
--
-- When invoking this API, it is recommended you use the @StreamARN@ input
-- parameter rather than the @StreamName@ input parameter.
--
-- The information returned includes the stream name, Amazon Resource Name
-- (ARN), creation time, enhanced metric configuration, and shard map. The
-- shard map is an array of shard objects. For each shard object, there is
-- the hash key and sequence number ranges that the shard spans, and the
-- IDs of any earlier shards that played in a role in creating the shard.
-- Every record ingested in the stream is identified by a sequence number,
-- which is assigned when the record is put into the stream.
--
-- You can limit the number of shards returned by each call. For more
-- information, see
-- <https://docs.aws.amazon.com/kinesis/latest/dev/kinesis-using-sdk-java-retrieve-shards.html Retrieving Shards from a Stream>
-- in the /Amazon Kinesis Data Streams Developer Guide/.
--
-- There are no guarantees about the chronological order shards returned.
-- To process shards in chronological order, use the ID of the parent shard
-- to track the lineage to the oldest shard.
--
-- This operation has a limit of 10 transactions per second per account.
--
-- This operation returns paginated results.
module Amazonka.Kinesis.DescribeStream
  ( -- * Creating a Request
    DescribeStream (..),
    newDescribeStream,

    -- * Request Lenses
    describeStream_exclusiveStartShardId,
    describeStream_limit,
    describeStream_streamARN,
    describeStream_streamName,

    -- * Destructuring the Response
    DescribeStreamResponse (..),
    newDescribeStreamResponse,

    -- * Response Lenses
    describeStreamResponse_httpStatus,
    describeStreamResponse_streamDescription,
  )
where

import qualified Amazonka.Core as Core
import qualified Amazonka.Core.Lens.Internal as Lens
import qualified Amazonka.Data as Data
import Amazonka.Kinesis.Types
import qualified Amazonka.Prelude as Prelude
import qualified Amazonka.Request as Request
import qualified Amazonka.Response as Response

-- | Represents the input for @DescribeStream@.
--
-- /See:/ 'newDescribeStream' smart constructor.
data DescribeStream = DescribeStream'
  { -- | The shard ID of the shard to start with.
    --
    -- Specify this parameter to indicate that you want to describe the stream
    -- starting with the shard whose ID immediately follows
    -- @ExclusiveStartShardId@.
    --
    -- If you don\'t specify this parameter, the default behavior for
    -- @DescribeStream@ is to describe the stream starting with the first shard
    -- in the stream.
    exclusiveStartShardId :: Prelude.Maybe Prelude.Text,
    -- | The maximum number of shards to return in a single call. The default
    -- value is 100. If you specify a value greater than 100, at most 100
    -- results are returned.
    limit :: Prelude.Maybe Prelude.Natural,
    -- | The ARN of the stream.
    streamARN :: Prelude.Maybe Prelude.Text,
    -- | The name of the stream to describe.
    streamName :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeStream' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'exclusiveStartShardId', 'describeStream_exclusiveStartShardId' - The shard ID of the shard to start with.
--
-- Specify this parameter to indicate that you want to describe the stream
-- starting with the shard whose ID immediately follows
-- @ExclusiveStartShardId@.
--
-- If you don\'t specify this parameter, the default behavior for
-- @DescribeStream@ is to describe the stream starting with the first shard
-- in the stream.
--
-- 'limit', 'describeStream_limit' - The maximum number of shards to return in a single call. The default
-- value is 100. If you specify a value greater than 100, at most 100
-- results are returned.
--
-- 'streamARN', 'describeStream_streamARN' - The ARN of the stream.
--
-- 'streamName', 'describeStream_streamName' - The name of the stream to describe.
newDescribeStream ::
  DescribeStream
newDescribeStream =
  DescribeStream'
    { exclusiveStartShardId =
        Prelude.Nothing,
      limit = Prelude.Nothing,
      streamARN = Prelude.Nothing,
      streamName = Prelude.Nothing
    }

-- | The shard ID of the shard to start with.
--
-- Specify this parameter to indicate that you want to describe the stream
-- starting with the shard whose ID immediately follows
-- @ExclusiveStartShardId@.
--
-- If you don\'t specify this parameter, the default behavior for
-- @DescribeStream@ is to describe the stream starting with the first shard
-- in the stream.
describeStream_exclusiveStartShardId :: Lens.Lens' DescribeStream (Prelude.Maybe Prelude.Text)
describeStream_exclusiveStartShardId = Lens.lens (\DescribeStream' {exclusiveStartShardId} -> exclusiveStartShardId) (\s@DescribeStream' {} a -> s {exclusiveStartShardId = a} :: DescribeStream)

-- | The maximum number of shards to return in a single call. The default
-- value is 100. If you specify a value greater than 100, at most 100
-- results are returned.
describeStream_limit :: Lens.Lens' DescribeStream (Prelude.Maybe Prelude.Natural)
describeStream_limit = Lens.lens (\DescribeStream' {limit} -> limit) (\s@DescribeStream' {} a -> s {limit = a} :: DescribeStream)

-- | The ARN of the stream.
describeStream_streamARN :: Lens.Lens' DescribeStream (Prelude.Maybe Prelude.Text)
describeStream_streamARN = Lens.lens (\DescribeStream' {streamARN} -> streamARN) (\s@DescribeStream' {} a -> s {streamARN = a} :: DescribeStream)

-- | The name of the stream to describe.
describeStream_streamName :: Lens.Lens' DescribeStream (Prelude.Maybe Prelude.Text)
describeStream_streamName = Lens.lens (\DescribeStream' {streamName} -> streamName) (\s@DescribeStream' {} a -> s {streamName = a} :: DescribeStream)

instance Core.AWSPager DescribeStream where
  page rq rs
    | Core.stop
        ( rs
            Lens.^. describeStreamResponse_streamDescription
            Prelude.. streamDescription_hasMoreShards
        ) =
        Prelude.Nothing
    | Prelude.isNothing
        ( rs
            Lens.^? describeStreamResponse_streamDescription
            Prelude.. streamDescription_shards
            Prelude.. Lens._last
            Prelude.. shard_shardId
        ) =
        Prelude.Nothing
    | Prelude.otherwise =
        Prelude.Just
          Prelude.$ rq
          Prelude.& describeStream_exclusiveStartShardId
          Lens..~ rs
          Lens.^? describeStreamResponse_streamDescription
          Prelude.. streamDescription_shards
          Prelude.. Lens._last
          Prelude.. shard_shardId

instance Core.AWSRequest DescribeStream where
  type
    AWSResponse DescribeStream =
      DescribeStreamResponse
  request overrides =
    Request.postJSON (overrides defaultService)
  response =
    Response.receiveJSON
      ( \s h x ->
          DescribeStreamResponse'
            Prelude.<$> (Prelude.pure (Prelude.fromEnum s))
            Prelude.<*> (x Data..:> "StreamDescription")
      )

instance Prelude.Hashable DescribeStream where
  hashWithSalt _salt DescribeStream' {..} =
    _salt
      `Prelude.hashWithSalt` exclusiveStartShardId
      `Prelude.hashWithSalt` limit
      `Prelude.hashWithSalt` streamARN
      `Prelude.hashWithSalt` streamName

instance Prelude.NFData DescribeStream where
  rnf DescribeStream' {..} =
    Prelude.rnf exclusiveStartShardId
      `Prelude.seq` Prelude.rnf limit
      `Prelude.seq` Prelude.rnf streamARN
      `Prelude.seq` Prelude.rnf streamName

instance Data.ToHeaders DescribeStream where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ( "Kinesis_20131202.DescribeStream" ::
                          Prelude.ByteString
                      ),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON DescribeStream where
  toJSON DescribeStream' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("ExclusiveStartShardId" Data..=)
              Prelude.<$> exclusiveStartShardId,
            ("Limit" Data..=) Prelude.<$> limit,
            ("StreamARN" Data..=) Prelude.<$> streamARN,
            ("StreamName" Data..=) Prelude.<$> streamName
          ]
      )

instance Data.ToPath DescribeStream where
  toPath = Prelude.const "/"

instance Data.ToQuery DescribeStream where
  toQuery = Prelude.const Prelude.mempty

-- | Represents the output for @DescribeStream@.
--
-- /See:/ 'newDescribeStreamResponse' smart constructor.
data DescribeStreamResponse = DescribeStreamResponse'
  { -- | The response's http status code.
    httpStatus :: Prelude.Int,
    -- | The current status of the stream, the stream Amazon Resource Name (ARN),
    -- an array of shard objects that comprise the stream, and whether there
    -- are more shards available.
    streamDescription :: StreamDescription
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeStreamResponse' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'httpStatus', 'describeStreamResponse_httpStatus' - The response's http status code.
--
-- 'streamDescription', 'describeStreamResponse_streamDescription' - The current status of the stream, the stream Amazon Resource Name (ARN),
-- an array of shard objects that comprise the stream, and whether there
-- are more shards available.
newDescribeStreamResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  -- | 'streamDescription'
  StreamDescription ->
  DescribeStreamResponse
newDescribeStreamResponse
  pHttpStatus_
  pStreamDescription_ =
    DescribeStreamResponse'
      { httpStatus = pHttpStatus_,
        streamDescription = pStreamDescription_
      }

-- | The response's http status code.
describeStreamResponse_httpStatus :: Lens.Lens' DescribeStreamResponse Prelude.Int
describeStreamResponse_httpStatus = Lens.lens (\DescribeStreamResponse' {httpStatus} -> httpStatus) (\s@DescribeStreamResponse' {} a -> s {httpStatus = a} :: DescribeStreamResponse)

-- | The current status of the stream, the stream Amazon Resource Name (ARN),
-- an array of shard objects that comprise the stream, and whether there
-- are more shards available.
describeStreamResponse_streamDescription :: Lens.Lens' DescribeStreamResponse StreamDescription
describeStreamResponse_streamDescription = Lens.lens (\DescribeStreamResponse' {streamDescription} -> streamDescription) (\s@DescribeStreamResponse' {} a -> s {streamDescription = a} :: DescribeStreamResponse)

instance Prelude.NFData DescribeStreamResponse where
  rnf DescribeStreamResponse' {..} =
    Prelude.rnf httpStatus
      `Prelude.seq` Prelude.rnf streamDescription