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{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedStrings #-}
module SpaceTraders.APIClient.Client
( APIMessage(..)
, APIPaginatedResponse
, APIResponse
, defaultReq
, send
, sendPaginated
, tokenReq
) where
import Control.Concurrent.Thread.Delay
import Control.Monad
import Control.Monad.Reader
import Data.Aeson
import Data.IORef
import qualified Data.Text as T
import qualified Data.Text.Encoding as T
import Network.HTTP.Simple
import Network.HTTP.Types.Status
import System.Directory
import System.Environment
import System.Posix.Process
import SpaceTraders
import SpaceTraders.APIClient.Errors
import SpaceTraders.APIClient.Pagination
import SpaceTraders.Utils
data APIMessage a = APIMessage { messageData :: a
, messagePagination :: Maybe Pagination
} deriving (Show)
instance FromJSON a => FromJSON (APIMessage a) where
parseJSON = withObject "APIMessage" $ \o ->
APIMessage <$> o .: "data"
<*> o .:? "meta"
type APIPaginatedResponse a = Either APIError (APIMessage a)
type APIResponse a = Either APIError a
defaultReq :: Request
defaultReq = setRequestHost "api.spacetraders.io"
$ setRequestPort 443
$ setRequestSecure True
$ setRequestHeader "Content-Type" ["application/json"]
defaultRequest
tokenReq :: T.Text -> Request
tokenReq token = setRequestHeader "Authorization" [T.encodeUtf8 $ "Bearer " <> token] defaultReq
send :: (FromJSON a, HasRequest env, MonadIO m, MonadReader env m) => (Request -> Request) -> m (APIResponse a)
send requestBuilder = do
response <- sendPaginated Nothing requestBuilder
case response of
Left e -> return $ Left e
Right (APIMessage d _) -> return $ Right d
sendPaginated :: (FromJSON a, HasRequest env, MonadIO m, MonadReader env m) => Maybe Pagination -> (Request -> Request) -> m (APIPaginatedResponse a)
sendPaginated pagination requestBuilder = do
env <- ask
let request = requestBuilder $ getRequest env
request' = case pagination of
Just myPage -> setRequestQueryString [("limit", Just . int2ByteString $ limit myPage), ("page", Just . int2ByteString $ page myPage)]
request
Nothing -> request
sendPaginated' request'
where
sendPaginated' :: (FromJSON a, HasRequest env, MonadIO m, MonadReader env m) => Request -> m (APIPaginatedResponse a)
sendPaginated' request = do
env <- ask
let iref = getLastAPICall env
response <- liftIO $ do
now <- microSinceEpoch
prev <- readIORef iref
let diff = prev + 400_000 - now
when (diff > 0) (delay diff)
writeIORef iref now
httpLbs request
let status = statusCode $ getResponseStatus response
body = getResponseBody response
if status >= 200 && status <= 299
then case eitherDecode body of
Left e -> return . Left $ APIError (-1000) (T.pack $ "Error decoding JSON APIMessage: " ++ e) Null
Right r -> return $ Right r
else case eitherDecode body of
Left e -> return . Left $ APIError (-status) (T.pack $ concat ["Error decoding JSON APIError: ", e, ". Got HTTP body: ", show body]) Null
Right (APIRateLimit r) -> do
liftIO $ delay (1_000_000 * round (retryAfter r))
sendPaginated' request
Right (APIResetHappened _) -> liftIO $ do
removeFile "spacetraders.db"
p <- getExecutablePath
a <- getArgs
e <- getEnvironment
executeFile p False a (Just e) -- we exec on ourselves
Right e -> return $ Left e
|
