WS component (WIP).
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src/App/WS.purs
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221
src/App/WS.purs
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module App.WS where
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{- This component handles all WS operations. -}
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import Prelude (Unit, bind, discard, map, pure, show, void, when, ($), (&&), (<$>), (<>), (>>=))
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import Bulma as Bulma
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import Data.Maybe (Maybe(..), isJust, isNothing)
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import Data.String as String
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import Data.Tuple (Tuple(..))
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import Effect.Aff.Class (class MonadAff)
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import Halogen as H
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import Halogen.HTML as HH
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import Halogen.HTML.Events as HE
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import Halogen.HTML.Properties as HP
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import Web.Socket.WebSocket as WS
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import Web.Socket.ReadyState (ReadyState(Connecting, Open, Closing, Closed))
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import App.Utils
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import Data.ArrayBuffer.Types (ArrayBuffer)
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import Web.Socket.BinaryType (BinaryType(ArrayBuffer))
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-- Input = url
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type Input = String
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-- MessageReceived (Tuple URL message)
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data Output
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= MessageReceived (Tuple String ArrayBuffer) -- Provide a received message to the parent.
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| WSJustConnected -- Inform the parent the connection is up.
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| WSJustClosed -- Inform the parent the connection is down.
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--| AppendSystemMessage String -- System message to print.
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--| AppendMessage String -- Basic message to print.
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--type Slot = H.Slot Query Output
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--type Query :: forall k. k -> Type
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data Query a = ToSend ArrayBuffer a
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data NewDomainFormAction
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= INP_newdomain String
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| UpdateSelectedDomain String
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data Action
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= Initialize
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| WebSocketParseError String
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| ConnectWebSocket
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| SendMessage ArrayBuffer
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| Finalize
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| HandleWebSocket (WebSocketEvent WebSocketMessageType)
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type WSInfo
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= { url :: String
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, connection :: Maybe WS.WebSocket
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, reconnect :: Boolean
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}
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type State =
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{ messages :: Array String
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, messageHistoryLength :: Int
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, wsInfo :: WSInfo
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}
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component :: forall m. MonadAff m => H.Component Query Input Output m
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component =
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H.mkComponent
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{ initialState
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, render
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, eval: H.mkEval $ H.defaultEval
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{ initialize = Just Initialize
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, handleAction = handleAction
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, finalize = Just Finalize
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}
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}
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initialState :: Input -> State
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initialState url =
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{ messages: []
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, messageHistoryLength: 10
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, wsInfo: { url: url
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, connection: Nothing
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, reconnect: false
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}
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}
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render :: forall m. State -> H.ComponentHTML Action () m
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render { messages, wsInfo }
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= HH.div_
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[ Bulma.h1 "WS BOX"
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, render_messages
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, renderReconnectButton (isNothing wsInfo.connection && wsInfo.reconnect)
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]
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where
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render_messages = HH.ul_ $ map (\msg -> HH.li_ [ HH.text msg ]) messages
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renderFootnote :: String -> H.ComponentHTML Action () m
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renderFootnote txt =
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HH.div [ HP.style "margin-bottom: 0.125rem; color: grey;" ] [ HH.small_ [ HH.text txt ] ]
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renderReconnectButton :: Boolean -> H.ComponentHTML Action () m
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renderReconnectButton cond =
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if cond
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then
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HH.p_
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[ HH.button
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[ HP.type_ HP.ButtonButton
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, HE.onClick \_ -> ConnectWebSocket
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]
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[ HH.text "Reconnect?" ]
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]
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else
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HH.p_
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[ renderFootnote "NOTE: A 'Reconnect?' button will appear if the connection drops"
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]
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handleAction :: forall m. MonadAff m => Action -> H.HalogenM State Action () Output m Unit
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handleAction action = do
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{ wsInfo } <- H.get
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case action of
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Initialize ->
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handleAction ConnectWebSocket
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Finalize -> do
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systemMessage "Finalize"
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case wsInfo.connection of
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Nothing -> systemMessage "No socket? How is that even possible?"
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Just socket -> H.liftEffect $ WS.close socket
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WebSocketParseError error ->
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systemMessage $ renderError (UnknownError error)
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ConnectWebSocket -> do
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systemMessage ("Connecting to \"" <> wsInfo.url <> "\"...")
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webSocket <- H.liftEffect $ WS.create wsInfo.url []
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H.liftEffect $ WS.setBinaryType webSocket ArrayBuffer
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H.modify_ _ { wsInfo { connection = Just webSocket } }
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void $ H.subscribe (HandleWebSocket <$> webSocketEmitter webSocket)
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SendMessage array_buffer_to_send -> do
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case wsInfo.connection of
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Nothing -> appendMessage $ "[🤖] Can't send a message, websocket is down!"
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Just webSocket -> H.liftEffect $ do
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sendArrayBuffer webSocket array_buffer_to_send
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HandleWebSocket wsEvent -> do
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case wsEvent of
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WebSocketMessage received_message -> do
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appendMessage $ "[😈] Received a message, ignored for now"
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H.raise $ MessageReceived $ Tuple wsInfo.url received_message.message
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WebSocketOpen -> do
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systemMessage ("Successfully connected to WebSocket at \"" <> wsInfo.url <> "\"!🎉")
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H.raise $ WSJustConnected
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WebSocketClose { code, reason, wasClean } -> do
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systemMessage $ renderCloseMessage code wasClean reason
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maybeCurrentConnection <- H.gets _.wsInfo.connection
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when (isJust maybeCurrentConnection) do
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H.modify_ _ { wsInfo { connection = Nothing, reconnect = true } }
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H.raise $ WSJustClosed
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WebSocketError errorType ->
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systemMessage $ renderError errorType
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-- TODO: MAYBE inform the parent the connection is closed (if it's the case).
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where
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renderCloseMessage
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:: Int
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-> Boolean
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-> String
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-> String
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renderCloseMessage code wasClean = case _ of
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"" -> baseCloseMessage
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reason -> baseCloseMessage <> "Reason: " <> reason
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where
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baseCloseMessage :: String
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baseCloseMessage =
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String.joinWith " "
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[ "Connection to WebSocket closed"
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, "[ CODE:"
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, show code
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, "|"
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, if wasClean then "CLEAN" else "DIRTY"
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, "]"
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]
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handleQuery :: forall a m. MonadAff m => Query a -> H.HalogenM State Action () Output m (Maybe a)
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handleQuery = case _ of
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ToSend message a -> do
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{ wsInfo } <- H.get
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case wsInfo.connection of
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Nothing -> do
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unableToSend "Not connected to server."
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pure Nothing
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Just webSocket -> do
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H.liftEffect (WS.readyState webSocket) >>= case _ of
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Connecting -> do
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unableToSend "Still connecting to server."
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pure Nothing
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Closing -> do
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unableToSend "Connection to server is closing."
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pure Nothing
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Closed -> do
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unableToSend "Connection to server has been closed."
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maybeCurrentConnection <- H.gets _.wsInfo.connection
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when (isJust maybeCurrentConnection) do
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H.modify_ _ { wsInfo { connection = Nothing, reconnect = true } }
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pure Nothing
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Open -> do
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H.liftEffect $ do
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sendArrayBuffer webSocket message
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pure (Just a)
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-- Request reply ->
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-- pure (Just (reply true))
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