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Types.hs
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Types.hs
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{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-missing-signatures #-}
{-# OPTIONS_GHC -fno-warn-type-defaults #-}
module Myo.WebSockets.Types (
EventType(..)
, MyoID
, Version(..)
, EMG(..)
, Pose(..)
, Orientation(..)
, Accelerometer(..)
, Gyroscope(..)
, Arm(..)
, Direction(..)
, Frame(..)
, Event(..)
, Command
, CommandData(..)
, Vibration(..)
, StreamEMGStatus(..)
, UnlockMode(..)
, UserAction(..)
, LockingPolicy(..)
-- * Lenses
, mye_type
, mye_timestamp
, mye_myo
, mye_arm
, mye_x_direction
, mye_version
, mye_warmup_result
, mye_rssi
, mye_pose
, mye_emg
, mye_orientation
, mye_accelerometer
, mye_gyroscope
, myv_major
, myv_minor
, myv_patch
, myv_hardware
-- * Smart constructors
, newCommand
) where
import Data.Aeson.TH
import Data.Int
import Data.Monoid
import Data.Scientific
import Data.Aeson.Types hiding (Result)
import Data.Char
import Control.Monad
import Control.Applicative
import Lens.Family2.TH
import qualified Data.Vector as V
import qualified Data.Text as T
import qualified Data.HashMap.Strict as HM
-------------------------------------------------------------------------------
data EventType =
EVT_Paired
| EVT_Battery_Level
| EVT_Locked
| EVT_Unlocked
| EVT_Warmup_Completed
| EVT_Connected
| EVT_Disconnected
| EVT_Arm_Synced
| EVT_Arm_Unsynced
| EVT_Orientation
| EVT_Pose
| EVT_RSSI
| EVT_EMG
deriving (Show, Eq)
-------------------------------------------------------------------------------
newtype MyoID = MyoID Integer deriving (Show, Eq)
-------------------------------------------------------------------------------
data Version = Version {
_myv_major :: !Integer
, _myv_minor :: !Integer
, _myv_patch :: !Integer
, _myv_hardware :: !Integer
} deriving (Show, Eq)
-------------------------------------------------------------------------------
-- It's an 8 bit integer
data EMG = EMG Int8 deriving (Show, Eq)
-------------------------------------------------------------------------------
data Pose =
Rest
| Fist
| Wave_In
| Wave_Out
| Fingers_Spread
| Double_Tap
| Unknown
deriving (Show, Eq)
data Orientation = Orientation {
_ori_x :: !Double
, _ori_y :: !Double
, _ori_z :: !Double
, _ori_w :: !Double
} deriving (Show, Eq)
data Accelerometer = Accelerometer {
_acc_x :: !Double
, _acc_y :: !Double
, _acc_z :: !Double
} deriving (Show, Eq)
data Gyroscope = Gyroscope {
_gyr_x :: !Double
, _gyr_y :: !Double
, _gyr_z :: !Double
} deriving (Show, Eq)
-------------------------------------------------------------------------------
data Arm = Arm_Left | Arm_Right deriving (Show, Eq)
-------------------------------------------------------------------------------
data Direction = Toward_wrist | Toward_elbow deriving (Show, Eq)
-------------------------------------------------------------------------------
data Frame = Evt Event
| Cmd Command
| Ack Acknowledgement
deriving (Show, Eq)
instance FromJSON Frame where
parseJSON a@(Array v) = case V.toList v of
[String "event", o@(Object _)] -> Evt <$> parseJSON o
[String "acknowledgement", o@(Object _)] -> Ack <$> parseJSON o
[String "command", o@(Object b)] -> case HM.lookup "result" b of
Nothing -> Cmd <$> parseJSON o
Just _ -> Ack <$> parseJSON o
_ -> typeMismatch "Frame: Unexpected payload in Array." a
parseJSON v = typeMismatch "Frame: Expecting an Array of frames." v
-------------------------------------------------------------------------------
-- TODO: Break down this `Event` type into a mandatory section (type, timestamp, myo)
-- and a payload specific field, so that we do not have all this proliferation of
-- Maybe. The `FromJSON` instance will need to be written manually, but it's not
-- too bad.
data Event = Event {
_mye_type :: !EventType
, _mye_timestamp :: !T.Text
, _mye_myo :: !MyoID
, _mye_arm :: !(Maybe Arm)
, _mye_x_direction :: !(Maybe Direction)
, _mye_version :: !(Maybe Version)
, _mye_warmup_result :: !(Maybe Result)
, _mye_rssi :: !(Maybe Int)
, _mye_pose :: !(Maybe Pose)
, _mye_emg :: !(Maybe EMG)
, _mye_orientation :: !(Maybe Orientation)
, _mye_accelerometer :: !(Maybe Accelerometer)
, _mye_gyroscope :: !(Maybe Gyroscope)
} deriving (Show, Eq)
data Acknowledgement = Acknowledgement {
_ack_command :: AcknowledgedCommand
, _ack_result :: Result
} deriving (Show, Eq)
data AcknowledgedCommand =
ACC_set_locking_policy
| ACC_set_stream_emg
deriving (Show, Eq)
-------------------------------------------------------------------------------
data Result = Success | Fail deriving (Show, Eq)
-------------------------------------------------------------------------------
data CommandData =
Vibrate Vibration
| Set_Stream_EMG StreamEMGStatus
| Unlock UnlockMode
| Notify_User_Action UserAction
| Set_Locking_Policy LockingPolicy
| Request_RSSI
| Lock
deriving (Show, Eq)
instance ToJSON CommandData where
toJSON cd = case cd of
Vibrate v -> object ["command" .= String "vibrate", "type" .= toJSON v]
Set_Stream_EMG v -> object ["command" .= String "set_stream_emg", "type" .= toJSON v]
Unlock v -> object ["command" .= String "unlock", "type" .= toJSON v]
Notify_User_Action v -> object ["command" .= String "notify_user_action", "type" .= toJSON v]
Set_Locking_Policy v -> object ["command" .= String "set_locking_policy", "type" .= toJSON v]
Lock -> object ["command" .= String "lock"]
Request_RSSI -> object ["command" .= String "request_rssi"]
instance FromJSON CommandData where
parseJSON (Object o) = do
(cmd :: T.Text) <- o .: "command"
typ <- o .: "type"
case cmd of
"vibrate" -> Vibrate <$> parseJSON typ
"request_rssi" -> pure Request_RSSI
"set_stream_emg" -> Set_Stream_EMG <$> parseJSON typ
"set_locking_policy" -> Set_Locking_Policy <$> parseJSON typ
"unlock" -> Unlock <$> parseJSON typ
"lock" -> pure Lock
"notify_user_action" -> Notify_User_Action <$> parseJSON typ
t -> fail $ "FromJSON CommandData: invalid 'command' found: " <> show t
parseJSON t = typeMismatch ("CommandData, expected Object, found " <> show t) t
-------------------------------------------------------------------------------
data Vibration = VIB_short
| VIB_medium
| VIB_long deriving (Show, Eq)
-------------------------------------------------------------------------------
data UserAction = UAC_single deriving (Show, Eq)
-------------------------------------------------------------------------------
data LockingPolicy = LKP_standard
| LKP_none deriving (Show, Eq)
-------------------------------------------------------------------------------
data UnlockMode = UMD_timed
| UMD_hold deriving (Show, Eq)
-------------------------------------------------------------------------------
data StreamEMGStatus = SES_enabled
| SES_disabled deriving (Show, Eq)
-------------------------------------------------------------------------------
data Command = Command {
_myc_myo :: !MyoID
, _myc_info :: CommandData
} deriving (Show, Eq)
instance FromJSON Command where
parseJSON v@(Object o) = Command <$> o .: "myo" <*> parseJSON v
parseJSON v = fail $ "FromJSON Command, expected Object, found " <> show v
instance ToJSON Command where
toJSON (Command mid cd) = case toJSON cd of
Object b -> object $ ["myo" .= mid] <> HM.toList b
v -> error $ "Command: toJSON of CommandData failed, found " <> show v
--------------------------------------------------------------------------------
-- | Creates a new `Command`, to be sent to the Myo armband.
newCommand :: MyoID -> CommandData -> Command
newCommand mid cd = Command mid cd
-------------------------------------------------------------------------------
instance FromJSON Version where
parseJSON (Array v) = do
let lst = V.toList v
case liftM2 (,) (Just $ length lst) (mapM toNumber lst) of
Just (4, x) -> case mapM floatingOrInteger x of
Right [ma, mi, pa, ha] -> return $ Version ma mi pa ha
_ -> mzero
_ -> mzero
parseJSON v = typeMismatch "Version: Expecting an Array like [major, minor, patch, hardware]" v
-------------------------------------------------------------------------------
toNumber :: Value -> Maybe Scientific
toNumber (Number v) = Just v
toNumber _ = Nothing
-------------------------------------------------------------------------------
-- TODO: Create an Int8 in a better way than this one!
instance FromJSON EMG where
parseJSON (Array v) = do
let lst = V.toList v
case liftM2 (,) (Just $ length lst) (mapM toNumber lst) of
Just (8, x) -> case mapM floatingOrInteger x of
Right res -> return . EMG . read $ concatMap show res
_ -> mzero
_ -> mzero
parseJSON v = typeMismatch "EMG: Expecting an Array of size 8." v
instance FromJSON Gyroscope where
parseJSON (Array v) = case V.toList v of
[Number x, Number y, Number z] -> return $ Gyroscope (toRealFloat x) (toRealFloat y) (toRealFloat z)
_ -> mzero
parseJSON v = typeMismatch "Gyroscope: Expecting an Array of Double like [x,y,z]" v
instance FromJSON Accelerometer where
parseJSON (Array v) = case V.toList v of
[Number x, Number y, Number z] -> return $ Accelerometer (toRealFloat x) (toRealFloat y) (toRealFloat z)
_ -> mzero
parseJSON v = typeMismatch "Accelerometer: Expecting an Array of Double like [x,y,z]" v
-------------------------------------------------------------------------------
--
-- JSON instances
--
deriveJSON defaultOptions ''MyoID
deriveFromJSON defaultOptions { fieldLabelModifier = drop 5 } ''Event
deriveFromJSON defaultOptions { constructorTagModifier = map toLower } ''Result
deriveJSON defaultOptions { constructorTagModifier = drop 4 . map toLower } ''Vibration
deriveJSON defaultOptions { constructorTagModifier = drop 4 . map toLower } ''StreamEMGStatus
deriveJSON defaultOptions { constructorTagModifier = drop 4 . map toLower } ''LockingPolicy
deriveJSON defaultOptions { constructorTagModifier = map toLower } ''UserAction
deriveJSON defaultOptions { constructorTagModifier = map toLower } ''UnlockMode
deriveFromJSON defaultOptions { fieldLabelModifier = drop 5 } ''Orientation
deriveFromJSON defaultOptions { constructorTagModifier = map toLower . drop 4 } ''EventType
deriveFromJSON defaultOptions { constructorTagModifier = map toLower } ''Pose
deriveFromJSON defaultOptions { constructorTagModifier = map toLower } ''Direction
deriveFromJSON defaultOptions { constructorTagModifier = map toLower . drop 4 } ''Arm
deriveFromJSON defaultOptions { fieldLabelModifier = drop 5 } ''Acknowledgement
deriveFromJSON defaultOptions { constructorTagModifier = drop 4 } ''AcknowledgedCommand
-------------------------------------------------------------------------------
--
-- Lenses
--
makeLenses ''Event
makeLenses ''Version