{-# LANGUAGE DataKinds       #-}
{-# LANGUAGE RecordWildCards #-}
--------------------------------------------------------------------------------
-- |
-- Module : Database.EventStore.Internal.Operation.DeleteStream
-- Copyright : (C) 2015 Yorick Laupa
-- License : (see the file LICENSE)
--
-- Maintainer : Yorick Laupa <yo.eight@gmail.com>
-- Stability : provisional
-- Portability : non-portable
--
--------------------------------------------------------------------------------
module Database.EventStore.Internal.Operation.ReadEvent
    ( ReadEvent(..)
    , readEvent
    ) where

--------------------------------------------------------------------------------
import Data.Int

--------------------------------------------------------------------------------
import Data.ProtocolBuffers

--------------------------------------------------------------------------------
import Database.EventStore.Internal.Command
import Database.EventStore.Internal.Control (publishWith)
import Database.EventStore.Internal.Communication (Transmit(..))
import Database.EventStore.Internal.Exec (Exec)
import Database.EventStore.Internal.Operation
import Database.EventStore.Internal.Operation.ReadEvent.Message
import Database.EventStore.Internal.Operation.Read.Common
import Database.EventStore.Internal.Prelude
import Database.EventStore.Internal.Settings
import Database.EventStore.Internal.Stream
import Database.EventStore.Internal.Types

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-- | Represents the result of looking up a specific event number from a stream.
data ReadEvent
    = ReadEventNotFound
      { ReadEvent -> Text
readEventStream :: !Text
      , ReadEvent -> Int64
readEventNumber :: !Int64
      }
    | ReadEvent
      { readEventStream   :: !Text
      , readEventNumber   :: !Int64
      , ReadEvent -> ResolvedEvent
readEventResolved :: !ResolvedEvent
      } deriving Int -> ReadEvent -> ShowS
[ReadEvent] -> ShowS
ReadEvent -> String
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [ReadEvent] -> ShowS
$cshowList :: [ReadEvent] -> ShowS
show :: ReadEvent -> String
$cshow :: ReadEvent -> String
showsPrec :: Int -> ReadEvent -> ShowS
$cshowsPrec :: Int -> ReadEvent -> ShowS
Show

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-- | Read a specific event given event number operation.
readEvent
  :: Settings
  -> Exec
  -> Text
  -> Int64
  -> Bool
  -> Maybe Credentials
  -> IO (Async (ReadResult EventNumber ReadEvent))
readEvent :: Settings
-> Exec
-> Text
-> Int64
-> Bool
-> Maybe Credentials
-> IO (Async (ReadResult EventNumber ReadEvent))
readEvent Settings{Bool
Maybe Text
Maybe TLSSettings
Maybe Credentials
LogType
NominalDiffTime
LoggerFilter
MonitoringBackend
Retry
s_defaultUserCredentials :: Settings -> Maybe Credentials
s_defaultConnectionName :: Settings -> Maybe Text
s_monitoring :: Settings -> MonitoringBackend
s_operationRetry :: Settings -> Retry
s_operationTimeout :: Settings -> NominalDiffTime
s_loggerDetailed :: Settings -> Bool
s_loggerFilter :: Settings -> LoggerFilter
s_loggerType :: Settings -> LogType
s_ssl :: Settings -> Maybe TLSSettings
s_reconnect_delay :: Settings -> NominalDiffTime
s_retry :: Settings -> Retry
s_requireMaster :: Settings -> Bool
s_heartbeatTimeout :: Settings -> NominalDiffTime
s_heartbeatInterval :: Settings -> NominalDiffTime
s_defaultUserCredentials :: Maybe Credentials
s_defaultConnectionName :: Maybe Text
s_monitoring :: MonitoringBackend
s_operationRetry :: Retry
s_operationTimeout :: NominalDiffTime
s_loggerDetailed :: Bool
s_loggerFilter :: LoggerFilter
s_loggerType :: LogType
s_ssl :: Maybe TLSSettings
s_reconnect_delay :: NominalDiffTime
s_retry :: Retry
s_requireMaster :: Bool
s_heartbeatTimeout :: NominalDiffTime
s_heartbeatInterval :: NominalDiffTime
..} Exec
exec Text
stream Int64
evtn Bool
tos Maybe Credentials
creds
  = do Mailbox
m <- forall (m :: * -> *). MonadBase IO m => m Mailbox
mailboxNew
       forall (m :: * -> *) a.
MonadBaseControl IO m =>
m a -> m (Async (StM m a))
async forall a b. (a -> b) -> a -> b
$
         do let req :: Request
req = Text -> Int64 -> Bool -> Bool -> Request
newRequest Text
stream Int64
evtn Bool
tos Bool
s_requireMaster
            Package
pkg <- forall msg (m :: * -> *).
(Encode msg, MonadIO m) =>
Command -> Maybe Credentials -> msg -> m Package
createPkg Command
readEventCmd Maybe Credentials
creds Request
req
            forall p a (m :: * -> *).
(Pub p, Typeable a, MonadIO m) =>
p -> a -> m ()
publishWith Exec
exec (Mailbox -> Lifetime -> Package -> Transmit
Transmit Mailbox
m Lifetime
OneTime Package
pkg)
            Either OperationError Response
outcome <- forall (m :: * -> *) resp.
(MonadBase IO m, Decode resp) =>
Mailbox -> m (Either OperationError resp)
mailboxReadDecoded Mailbox
m
            case Either OperationError Response
outcome of
              Left OperationError
e
                -> forall (m :: * -> *) e a. (MonadThrow m, Exception e) => e -> m a
throw OperationError
e
              Right Response
resp
                -> let r :: FieldType (Required 1 (Enumeration Result))
r = forall a. HasField a => a -> FieldType a
getField forall a b. (a -> b) -> a -> b
$ Response -> Required 1 (Enumeration Result)
_result Response
resp
                       evt :: ResolvedEvent
evt = ResolvedIndexedEvent -> ResolvedEvent
newResolvedEvent forall a b. (a -> b) -> a -> b
$ forall a. HasField a => a -> FieldType a
getField forall a b. (a -> b) -> a -> b
$ Response -> Required 2 (Message ResolvedIndexedEvent)
_indexedEvent Response
resp
                       err :: FieldType (Optional 3 (Value Text))
err = forall a. HasField a => a -> FieldType a
getField forall a b. (a -> b) -> a -> b
$ Response -> Optional 3 (Value Text)
_error Response
resp
                       notFound :: ReadResult EventNumber ReadEvent
notFound = forall a t. a -> ReadResult t a
ReadSuccess forall a b. (a -> b) -> a -> b
$ Text -> Int64 -> ReadEvent
ReadEventNotFound Text
stream Int64
evtn
                       found :: ReadResult EventNumber ReadEvent
found = forall a t. a -> ReadResult t a
ReadSuccess forall a b. (a -> b) -> a -> b
$ Text -> Int64 -> ResolvedEvent -> ReadEvent
ReadEvent Text
stream Int64
evtn ResolvedEvent
evt in
                   case FieldType (Required 1 (Enumeration Result))
r of
                     FieldType (Required 1 (Enumeration Result))
Result
NOT_FOUND      -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ReadResult EventNumber ReadEvent
notFound
                     FieldType (Required 1 (Enumeration Result))
Result
NO_STREAM      -> forall (f :: * -> *) a. Applicative f => a -> f a
pure forall a. ReadResult EventNumber a
ReadNoStream
                     FieldType (Required 1 (Enumeration Result))
Result
STREAM_DELETED -> forall (f :: * -> *) a. Applicative f => a -> f a
pure forall a b. (a -> b) -> a -> b
$ forall a. StreamName -> ReadResult EventNumber a
ReadStreamDeleted forall a b. (a -> b) -> a -> b
$ Text -> StreamName
StreamName Text
stream
                     FieldType (Required 1 (Enumeration Result))
Result
ERROR          -> forall (f :: * -> *) a. Applicative f => a -> f a
pure (forall t a. Maybe Text -> ReadResult t a
ReadError FieldType (Optional 3 (Value Text))
err)
                     FieldType (Required 1 (Enumeration Result))
Result
ACCESS_DENIED  -> forall (f :: * -> *) a. Applicative f => a -> f a
pure forall a b. (a -> b) -> a -> b
$ forall t a. StreamId t -> ReadResult t a
ReadAccessDenied forall a b. (a -> b) -> a -> b
$ Text -> StreamName
StreamName Text
stream
                     FieldType (Required 1 (Enumeration Result))
Result
SUCCESS        -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ReadResult EventNumber ReadEvent
found