re: better with the attached files.
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51
src/App/ComponentA.purs
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51
src/App/ComponentA.purs
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module App.ComponentA where
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import Prelude
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import Data.Maybe (Maybe(..))
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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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type Slot = H.Slot Query Void
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data Query a = IsOn (Boolean -> a)
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data Action = Toggle
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type State = Boolean
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component :: forall i o m. H.Component Query i o 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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{ handleAction = handleAction
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, handleQuery = handleQuery
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}
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}
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initialState :: forall i. i -> State
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initialState _ = false
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render :: forall m. State -> H.ComponentHTML Action () m
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render state =
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HH.div_
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[ HH.p_ [ HH.text "Toggle me!" ]
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, HH.button
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[ HE.onClick \_ -> Toggle ]
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[ HH.text (if state then "On" else "Off") ]
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]
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handleAction :: forall o m. Action -> H.HalogenM State Action () o m Unit
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handleAction = case _ of
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Toggle ->
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H.modify_ not
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handleQuery :: forall o m a. Query a -> H.HalogenM State Action () o m (Maybe a)
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handleQuery = case _ of
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IsOn k -> do
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enabled <- H.get
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pure (Just (k enabled))
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53
src/App/ComponentB.purs
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53
src/App/ComponentB.purs
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@ -0,0 +1,53 @@
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module App.ComponentB where
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import Prelude
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import Data.Maybe (Maybe(..))
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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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type Slot = H.Slot Query Void
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data Query a = GetCount (Int -> a)
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data Action = Increment
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type State = Int
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component :: forall i o m. H.Component Query i o 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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{ handleAction = handleAction
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, handleQuery = handleQuery
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}
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}
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initialState :: forall i. i -> State
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initialState _ = 0
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render :: forall m. State -> H.ComponentHTML Action () m
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render state =
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HH.div_
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[ HH.p_
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[ HH.text "Current value:"
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, HH.strong_ [ HH.text (show state) ]
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]
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, HH.button
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[ HE.onClick \_ -> Increment ]
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[ HH.text ("Increment") ]
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]
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handleAction :: forall o m. Action -> H.HalogenM State Action () o m Unit
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handleAction = case _ of
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Increment ->
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H.modify_ (_ + 1)
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handleQuery :: forall o m a. Query a -> H.HalogenM State Action () o m (Maybe a)
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handleQuery = case _ of
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GetCount k ->
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Just <<< k <$> H.get
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52
src/App/ComponentC.purs
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52
src/App/ComponentC.purs
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module App.ComponentC where
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import Prelude
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import Data.Maybe (Maybe(..))
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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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type Slot = H.Slot Query Void
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data Query a = GetValue (String -> a)
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data Action = HandleInput String
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type State = String
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component :: forall i o m. H.Component Query i o 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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{ handleAction = handleAction
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, handleQuery = handleQuery
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}
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}
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initialState :: forall i. i -> State
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initialState _ = "Hello"
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render :: forall m. State -> H.ComponentHTML Action () m
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render state =
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HH.label_
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[ HH.p_ [ HH.text "What do you have to say?" ]
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, HH.input
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[ HP.value state
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, HE.onValueInput HandleInput
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]
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]
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handleAction :: forall o m. Action -> H.HalogenM State Action () o m Unit
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handleAction = case _ of
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HandleInput value ->
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H.put value
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handleQuery :: forall o m a. Query a -> H.HalogenM State Action () o m (Maybe a)
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handleQuery = case _ of
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GetValue k ->
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Just <<< k <$> H.get
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96
src/App/Container.purs
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96
src/App/Container.purs
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@ -0,0 +1,96 @@
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module App.Container where
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import Prelude
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import Data.Maybe (Maybe(..))
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import App.ComponentA as CA
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import App.ComponentB as CB
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import App.ComponentC as CC
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import App.AuthenticationForm as AF
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import App.OriginalInterface as OI
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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 Type.Proxy (Proxy(..))
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import Effect.Aff.Class (class MonadAff)
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data Action = ReadStates
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type State =
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{ a :: Maybe Boolean
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, b :: Maybe Int
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, c :: Maybe String
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}
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type ChildSlots =
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( a :: CA.Slot Unit
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, b :: CB.Slot Unit
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, c :: CC.Slot Unit
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, af :: AF.Slot Unit
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, oi :: OI.Slot Unit
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)
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_a = Proxy :: Proxy "a"
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_b = Proxy :: Proxy "b"
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_c = Proxy :: Proxy "c"
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_af = Proxy :: Proxy "af"
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_oi = Proxy :: Proxy "oi"
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component :: forall q i o m. MonadAff m => H.Component q i o 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 { handleAction = handleAction }
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}
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initialState :: forall i. i -> State
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initialState _ = { a: Nothing, b: Nothing, c: Nothing }
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render :: forall m. MonadAff m => State -> H.ComponentHTML Action ChildSlots m
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render state = HH.div_
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[ HH.div
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[ HP.class_ (H.ClassName "box") ]
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[ HH.h1_ [ HH.text "Component A" ]
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, HH.slot_ _a unit CA.component unit
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]
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, HH.div
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[ HP.class_ (H.ClassName "box") ]
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[ HH.h1_ [ HH.text "Component B" ]
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, HH.slot_ _b unit CB.component unit
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]
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, HH.div
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[ HP.class_ (H.ClassName "box") ]
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[ HH.h1_ [ HH.text "Component C" ]
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, HH.slot_ _c unit CC.component unit
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]
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, HH.p_
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[ HH.text "Last observed states:" ]
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, HH.ul_
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[ HH.li_ [ HH.text ("Component A: " <> show state.a) ]
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, HH.li_ [ HH.text ("Component B: " <> show state.b) ]
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, HH.li_ [ HH.text ("Component C: " <> show state.c) ]
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]
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, HH.button
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[ HE.onClick \_ -> ReadStates ]
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[ HH.text "Check states now" ]
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, HH.div
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[ HP.class_ (H.ClassName "box") ]
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[ HH.h1_ [ HH.text "Authentication form" ]
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, HH.slot_ _af unit AF.component "ws://127.0.0.1:8080"
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]
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, HH.div
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[ HP.class_ (H.ClassName "box") ]
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[ HH.h1_ [ HH.text "Original interface" ]
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, HH.slot_ _oi unit OI.component "ws://127.0.0.1:8080"
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]
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]
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handleAction :: forall o m. MonadAff m => Action -> H.HalogenM State Action ChildSlots o m Unit
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handleAction = case _ of
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ReadStates -> do
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a <- H.request _a unit CA.IsOn
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b <- H.request _b unit CB.GetCount
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c <- H.request _c unit CC.GetValue
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H.put { a, b, c }
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411
src/App/OriginalInterface.purs
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411
src/App/OriginalInterface.purs
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module App.OriginalInterface where
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import Prelude
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import Control.Monad.Except (runExcept)
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import Control.Monad.State (class MonadState)
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import Data.Array as A
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import Data.Bifunctor (lmap)
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-- import Data.Codec.Argonaut (JsonCodec, JsonDecodeError)
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-- import Data.Codec.Argonaut as CA
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import Data.Const (Const)
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import Data.Either (Either(..))
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import Data.Maybe (Maybe(..), isJust, isNothing, maybe)
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import Data.String as String
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import Effect (Effect)
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import Effect.Aff.Class (class MonadAff)
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import Foreign (Foreign)
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import Foreign as F
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import Halogen as H
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import Halogen.Aff (awaitBody, runHalogenAff) as HA
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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 Halogen.Query.Event as HQE
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import Halogen.Subscription as HS
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import Halogen.VDom.Driver (runUI)
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import Web.Event.Event (Event)
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import Web.Event.Event as Event
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import Web.Socket.Event.CloseEvent as WSCE
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import Web.Socket.Event.EventTypes as WSET
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import Web.Socket.Event.MessageEvent as WSME
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import Web.Socket.ReadyState (ReadyState(Connecting, Open, Closing, Closed))
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import Web.Socket.WebSocket as WS
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import Data.ArrayBuffer.Types (ArrayBuffer)
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import Web.Socket.BinaryType (BinaryType(ArrayBuffer))
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import App.IPC (toIPC, fromIPC)
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--------------------------------------------------------------------------------
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-- WebSocketEvent type
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--------------------------------------------------------------------------------
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data WebSocketEvent :: Type -> Type
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data WebSocketEvent msg
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= WebSocketMessage { message :: msg, origin :: String, lastEventId :: String }
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| WebSocketOpen
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| WebSocketClose { code :: Int, reason :: String, wasClean :: Boolean }
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| WebSocketError ErrorType
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webSocketEmitter :: WS.WebSocket -> HS.Emitter (WebSocketEvent WebSocketMessageType)
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webSocketEmitter socket = do
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HS.makeEmitter \push -> do
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openId <- HS.subscribe openEmitter push
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errorId <- HS.subscribe errorEmitter push
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closeId <- HS.subscribe closeEmitter push
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messageId <- HS.subscribe messageEmitter push
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pure do
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HS.unsubscribe openId
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HS.unsubscribe errorId
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HS.unsubscribe closeId
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HS.unsubscribe messageId
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where
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target = WS.toEventTarget socket
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openEmitter :: HS.Emitter (WebSocketEvent WebSocketMessageType)
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openEmitter =
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HQE.eventListener WSET.onOpen target \_ ->
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Just WebSocketOpen
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errorEmitter :: HS.Emitter (WebSocketEvent WebSocketMessageType)
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errorEmitter =
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HQE.eventListener WSET.onError target \_ ->
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Just (WebSocketError UnknownWebSocketError)
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closeEmitter :: HS.Emitter (WebSocketEvent WebSocketMessageType)
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closeEmitter =
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HQE.eventListener WSET.onClose target \event ->
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WSCE.fromEvent event >>= \closeEvent ->
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Just $ WebSocketClose { code: WSCE.code closeEvent
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, reason: WSCE.reason closeEvent
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, wasClean: WSCE.wasClean closeEvent
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}
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messageEmitter :: HS.Emitter (WebSocketEvent WebSocketMessageType)
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messageEmitter = HQE.eventListener WSET.onMessage target (WSME.fromEvent >=> decodeMessageEvent)
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decodeMessageEvent :: WSME.MessageEvent -> Maybe (WebSocketEvent WebSocketMessageType)
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decodeMessageEvent = \msgEvent -> do
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let
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foreign' :: Foreign
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foreign' = WSME.data_ msgEvent
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case foreignToArrayBuffer foreign' of
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Left errs -> pure $ WebSocketError $ UnknownError errs
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Right arrayBuffer -> pure $ WebSocketMessage { message: arrayBuffer, origin: WSME.origin msgEvent, lastEventId: WSME.lastEventId msgEvent }
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---------------------------
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-- Errors
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---------------------------
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data ErrorType
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= MessageIsServerAdvertisement String
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| UnknownError String
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| UnknownWebSocketError
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renderError :: ErrorType -> String
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renderError = case _ of
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UnknownError str ->
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"Unknown error: " <> str
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MessageIsServerAdvertisement str ->
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"Received following advertisment from server: " <> str
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UnknownWebSocketError ->
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"Unknown 'error' event has been fired by WebSocket event listener"
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--------------------------------------------------------------------------------
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-- `Main` function
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--------------------------------------------------------------------------------
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main :: Effect Unit
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main = HA.runHalogenAff do
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body <- HA.awaitBody
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let url = "ws://localhost:8080"
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runUI component url body
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-- runUI Container.component unit body
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--------------------------------------------------------------------------------
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-- WebSocket message type
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--------------------------------------------------------------------------------
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type WebSocketMessageType = ArrayBuffer
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--------------------------------------------------------------------------------
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-- Root component module
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--------------------------------------------------------------------------------
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type Slot = H.Slot Query Void
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type Query :: forall k. k -> Type
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type Query = Const Void
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type Input = String
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type Output = Void
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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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| HandleInputUpdate String
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| SendMessage Event
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| HandleWebSocket (WebSocketEvent WebSocketMessageType)
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type State =
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{ messages :: Array String
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, messageHistoryLength :: Int
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, inputText :: String
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, wsUrl :: String
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, wsConnection :: Maybe WS.WebSocket
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, canReconnect :: Boolean
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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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}
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}
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||||
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initialState :: Input -> State
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initialState input =
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{ messages: []
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, messageHistoryLength: 10
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, inputText: ""
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, wsUrl: input
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, wsConnection: Nothing
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, canReconnect: false
|
||||
}
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||||
|
||||
wrapperStyle :: String
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wrapperStyle =
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"""
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display: block;
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flex-direction: column;
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justify-content: space-between;
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height: calc(100vh - 30px);
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background: #282c34;
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color: #e06c75;
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font-family: 'Consolas';
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padding: 5px 20px 5px 20px;
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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, inputText, wsConnection, canReconnect, messageHistoryLength } =
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HH.div
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[ HP.style wrapperStyle ]
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||||
[ HH.h2_ [ HH.text "WebSocket example for PureScript Halogen" ]
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, HH.form
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[ HE.onSubmit SendMessage ]
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[ HH.ul_ $ map (\msg -> HH.li_ [ HH.text msg ]) messages
|
||||
, HH.p_
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||||
[ HH.div_
|
||||
[ HH.input
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||||
[ HP.style "padding: 0.5rem 0.75rem; margin-bottom: 0.25rem;"
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||||
, HP.type_ HP.InputText
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, HP.value inputText
|
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, HE.onValueInput HandleInputUpdate
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, maybe (HP.disabled true) (\_ -> HP.enabled true) wsConnection
|
||||
]
|
||||
]
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||||
, HH.div_
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||||
[ HH.button
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||||
[ HP.style "padding: 0.5rem 1.25rem;"
|
||||
, HP.type_ HP.ButtonSubmit
|
||||
, maybe (HP.disabled true) (\_ -> HP.enabled true) wsConnection
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||||
]
|
||||
[ HH.text "Send Message to Server" ]
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||||
]
|
||||
]
|
||||
, renderMaxHistoryLength messageHistoryLength
|
||||
, renderReconnectButton (isNothing wsConnection && canReconnect)
|
||||
]
|
||||
]
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where
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||||
renderFootnote :: String -> H.ComponentHTML Action () m
|
||||
renderFootnote txt =
|
||||
HH.div [ HP.style "margin-bottom: 0.125rem; color: grey;" ] [ HH.small_ [ HH.text txt ] ]
|
||||
|
||||
renderMaxHistoryLength :: Int -> H.ComponentHTML Action () m
|
||||
renderMaxHistoryLength len =
|
||||
renderFootnote ("NOTE: Maximum chat history length is " <> show len <> " messages")
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||||
|
||||
renderReconnectButton :: Boolean -> H.ComponentHTML Action () m
|
||||
renderReconnectButton cond =
|
||||
if cond
|
||||
then
|
||||
HH.p_
|
||||
[ HH.button
|
||||
[ HP.type_ HP.ButtonButton
|
||||
, HE.onClick \_ -> ConnectWebSocket
|
||||
]
|
||||
[ HH.text "Reconnect?" ]
|
||||
]
|
||||
else
|
||||
HH.p_
|
||||
[ renderFootnote "NOTE: A 'Reconnect?' button will appear if the connection drops"
|
||||
, renderFootnote "NOTE: You can type /disconnect to manually disconnect"
|
||||
]
|
||||
|
||||
handleAction :: forall m. MonadAff m => Action -> H.HalogenM State Action () Output m Unit
|
||||
handleAction = case _ of
|
||||
Initialize ->
|
||||
handleAction ConnectWebSocket
|
||||
|
||||
WebSocketParseError error ->
|
||||
systemMessage $ renderError (UnknownError error)
|
||||
|
||||
ConnectWebSocket -> do
|
||||
{ wsUrl } <- H.get
|
||||
systemMessage ("Connecting to \"" <> wsUrl <> "\"...")
|
||||
webSocket <- H.liftEffect $ WS.create wsUrl []
|
||||
H.liftEffect $ WS.setBinaryType webSocket ArrayBuffer
|
||||
H.modify_ _ { wsConnection = Just webSocket }
|
||||
void $ H.subscribe (HandleWebSocket <$> webSocketEmitter webSocket)
|
||||
|
||||
HandleInputUpdate text -> do
|
||||
H.modify_ _ { inputText = text }
|
||||
|
||||
SendMessage ev -> do
|
||||
H.liftEffect $ Event.preventDefault ev
|
||||
|
||||
{ wsConnection, inputText } <- H.get
|
||||
|
||||
case wsConnection, inputText of
|
||||
Nothing, _ ->
|
||||
unableToSend "Not connected to server."
|
||||
|
||||
Just _ , "" ->
|
||||
unableToSend "Cannot send an empty message"
|
||||
|
||||
Just webSocket, outgoingMessage -> do
|
||||
H.liftEffect (WS.readyState webSocket) >>= case _ of
|
||||
Connecting ->
|
||||
unableToSend "Still connecting to server."
|
||||
|
||||
Closing ->
|
||||
unableToSend "Connection to server is closing."
|
||||
|
||||
Closed -> do
|
||||
unableToSend "Connection to server has been closed."
|
||||
maybeCurrentConnection <- H.gets _.wsConnection
|
||||
when (isJust maybeCurrentConnection) do
|
||||
H.modify_ _ { wsConnection = Nothing, canReconnect = true }
|
||||
|
||||
Open -> do
|
||||
case outgoingMessage of
|
||||
"/disconnect" -> do
|
||||
H.liftEffect $ WS.close webSocket
|
||||
systemMessageReset $ "You have requested to disconnect from the server"
|
||||
otherMessage -> do
|
||||
H.liftEffect $ do
|
||||
ab <- toIPC otherMessage
|
||||
sendArrayBuffer webSocket ab
|
||||
appendMessageReset $ "[😇] You: " <> otherMessage
|
||||
|
||||
HandleWebSocket wsEvent ->
|
||||
case wsEvent of
|
||||
WebSocketMessage messageEvent -> do
|
||||
receivedMessage <- H.liftEffect $ fromIPC messageEvent.message
|
||||
case receivedMessage of
|
||||
Left parseError -> do
|
||||
handleAction $ WebSocketParseError $ show parseError
|
||||
Right string -> do
|
||||
appendMessage $ "[😈] Server: " <> string
|
||||
|
||||
WebSocketOpen -> do
|
||||
{ wsUrl } <- H.get
|
||||
systemMessage ("Successfully connected to WebSocket at \"" <> wsUrl <> "\"!🎉")
|
||||
|
||||
WebSocketClose { code, reason, wasClean } -> do
|
||||
systemMessage $ renderCloseMessage code wasClean reason
|
||||
maybeCurrentConnection <- H.gets _.wsConnection
|
||||
when (isJust maybeCurrentConnection) do
|
||||
H.modify_ _ { wsConnection = Nothing, canReconnect = true }
|
||||
|
||||
WebSocketError errorType ->
|
||||
systemMessage $ renderError errorType
|
||||
|
||||
where
|
||||
renderCloseMessage
|
||||
:: Int
|
||||
-> Boolean
|
||||
-> String
|
||||
-> String
|
||||
renderCloseMessage code wasClean = case _ of
|
||||
"" -> baseCloseMessage
|
||||
reason -> baseCloseMessage <> "Reason: " <> reason
|
||||
where
|
||||
baseCloseMessage :: String
|
||||
baseCloseMessage =
|
||||
String.joinWith " "
|
||||
[ "Connection to WebSocket closed"
|
||||
, "[ CODE:"
|
||||
, show code
|
||||
, "|"
|
||||
, if wasClean then "CLEAN" else "DIRTY"
|
||||
, "]"
|
||||
]
|
||||
|
||||
sendArrayBuffer :: WS.WebSocket -> ArrayBuffer -> Effect Unit
|
||||
sendArrayBuffer = WS.sendArrayBuffer
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
-- Helpers for updating the array of messages sent/received
|
||||
--------------------------------------------------------------------------------
|
||||
-- Append a new message to the chat history, with a boolean that allows you to
|
||||
-- clear the text input field or not. The number of displayed `messages` in the
|
||||
-- chat history (including system) is controlled by the `messageHistoryLength`
|
||||
-- field in the component `State`.
|
||||
appendMessageGeneric :: forall m. MonadState State m => Boolean -> String -> m Unit
|
||||
appendMessageGeneric clearField msg = do
|
||||
histSize <- H.gets _.messageHistoryLength
|
||||
if clearField
|
||||
then H.modify_ \st ->
|
||||
st { messages = appendSingle histSize msg st.messages, inputText = "" }
|
||||
else H.modify_ \st ->
|
||||
st { messages = appendSingle histSize msg st.messages }
|
||||
where
|
||||
-- Limits the nnumber of recent messages to `maxHist`
|
||||
appendSingle :: Int -> String -> Array String -> Array String
|
||||
appendSingle maxHist x xs
|
||||
| A.length xs < maxHist = xs `A.snoc` x
|
||||
| otherwise = (A.takeEnd (maxHist-1) xs) `A.snoc` x
|
||||
|
||||
-- Append a new message to the chat history, while not clearing
|
||||
-- the user input field
|
||||
appendMessage :: forall m. MonadState State m => String -> m Unit
|
||||
appendMessage = appendMessageGeneric false
|
||||
|
||||
-- Append a new message to the chat history and also clear
|
||||
-- the user input field
|
||||
appendMessageReset :: forall m. MonadState State m => String -> m Unit
|
||||
appendMessageReset = appendMessageGeneric true
|
||||
|
||||
-- Append a system message to the chat log.
|
||||
systemMessage :: forall m. MonadState State m => String -> m Unit
|
||||
systemMessage msg = appendMessage ("[🤖] System: " <> msg)
|
||||
|
||||
-- As above, but also clears the user input field. e.g. in
|
||||
-- the case of a "/disconnect" command
|
||||
systemMessageReset :: forall m. MonadState State m => String -> m Unit
|
||||
systemMessageReset msg = appendMessageReset ("[🤖] System: " <> msg)
|
||||
|
||||
-- A system message to use when a message cannot be sent.
|
||||
unableToSend :: forall m. MonadState State m => String -> m Unit
|
||||
unableToSend reason = systemMessage ("Unable to send. " <> reason)
|
||||
|
||||
foreignToArrayBuffer :: Foreign -> Either String ArrayBuffer
|
||||
foreignToArrayBuffer
|
||||
= lmap renderForeignErrors
|
||||
<<< runExcept
|
||||
<<< F.unsafeReadTagged "ArrayBuffer"
|
||||
where
|
||||
renderForeignErrors :: F.MultipleErrors -> String
|
||||
renderForeignErrors =
|
||||
String.joinWith "; " <<< A.fromFoldable <<< map F.renderForeignError
|
||||
Loading…
Reference in New Issue
Block a user